The actual Active Set size has been logged when driving a 10-minute route through a pilot-polluted area. The same route was driven four times, each time with different settings for parameters
reportingRange1a and
reportingRange1b, but keeping the delta between them constant. Parameter
maxActiveSet was set to 3 during all measurements. As seen in the figure, the distribution of measurement points having different Active Set sizes change gradually. Using
reportingRange1a = 3 [
dB] and
reportingRange1b = 5 [
dB], the average number of cells in the Active Set is expected to have the following distribution: 60% for
AS=1, 30% for
AS=2, and 10% for
AS=3. The highest parameter settings cause the
UE to be in soft/softer handover in basically all spots along the route, a situation that is unfavorable for system capacity.
The recommended value for
hysteresis1c is 1
dB. A higher value causes a decreased Active Set update rate, that is, a higher
CPICH signal is required from a new cell to replace the weakest cell in the Active Set. What would make the Active Set update rate decrease is the reduction of event1c, since event1a and event1b are kept fairly constant. But a higher value of
hysteresis1c may cause too late an addition of new cells in the Active Set.
It is important to remember that the measurements used for handover event evaluation are made on the downlink
CPICH. This means that using different settings for
primaryCpichPower (power assigned to the
CPICH) on neighboring cells will create a more complicated situation. Unnecessary destructive interference might be the result in the
UL, since the
UE will not be power controlled by the weaker cell until it has been added to the Active Set.
The
IRAT and
IFHO functions are both triggered by coverage. The purpose with both functions is to save the connection by making a
HO to either
GSM or to another
WCDMA frequency, when the coverage on the original
WCDMA frequency deteriorates. Instead of dropping, the connection should preferably continue on another
WCDMA frequency or in
GSM.
To detect deteriorating coverage, the connection quality monitoring uses event 2d and event 6d to trigger bad coverage in
DL or
UL. When either event is triggered, the
UE will start new measurements for either IF or
GSM cells, to try to detect a new candidate cell for
HO. This usually also involves starting the compressed mode.
The time required for the
UE to detect a new cell varies between approximately 2 to 8 seconds, measured from the detection of bad coverage to detection of the new
HO candidate cell. This time depends on signal levels
UE measurement performance and the length of the neighbor cell lists. To make a reliable
HO, instead of dropping the call, the deteriorating coverage must be detected early enough, and the neighbor cell lists should not be longer than necessary. It should be noted that
UE measurement performance might also vary between different manufacturers.
Connection quality monitoring is common for both the
IRAT and
IFHO functions and consists of
DL quality measurements based on
WCDMA P-CPICH
Ec/No and
WCDMA P-CPICH
RSCP running in parallel, and of
UL UE Tx power measurements. The
DL trigger, that is, the event 2d thresholds (
usedFreqThresh2dEcno and
usedFreqThresh2dRscp + offsets), is set on cell level. If this threshold is set too low, the coverage problem will be detected too late and
UE will not have time to do
HO measurements and detect a candidate cell before the dropped calls. And if this threshold is set too early, there might be too many triggers, that is, start of compressed mode and users are handed over to
GSM or other
WCDMA carrier unnecessarily. If there are specific locations in a cell where the coverage falls very quickly, the call will probably drop anyway, since the
UE will not have time to perform the measurements and detect a
HO candidate cell. Due to the required measurement times, it is difficult to handle this type of situations.
Two new parameters have been introduced in P6.0, serviceOffset2dEcNo and serviceOffset2dRscp. With these parameters, which are configured per
RNC and per
RAB (UeRc-state), the thresholds for event 2d ( and by that also 2b and 3a thresholds) can be configured differently for different services. If neither
IFHO nor
IRAT HO is enabled the setting of the parameters has no impact on the network.
The purpose of the parameters is to be able to set the coverage based
HO triggers depending on the expected coverage for different services and
RABs. The trigger thresholds can be set earlier or later than for speech depending on the expected coverage, which can differ between different services. The offsets can also be used to disable IF and
IRAT HO for specific
RABs or rates.
Note: This information is valid when upgrading from P5 to a later release.
If
IFHO but not
IRAT HO is enabled then the default setting should be used in order to maintain P5 behaviour. The default setting is serviceOffsetEcNo=0 and serviceOffsetRscp=0 for all UeRc states, which will set the same triggering point for all
RABs, and not disable any specific
RAB or rate.
If
IRAT HO but not
IFHO is used then the offsets must be set differently in order to maintain the previous system behavior, which only allowed
IRAT HO on interactive for the
DL rate of 64 kbit/s. To disable
IRAT HO for
DL interactive rates of 128 and 384 then set serviceOffset2dEcNo=-20 and serviceOffset2dRSCP=-50 for the following
RABs (UeRc-states):
6 Interact.
PS (64/128
kbps)
7 Interact.
PS (64/384
kbps)
18 Interact.
PS (128/128
kbps)
30 Interact.
PS (384/128
kbps)
31 Interact.
PS (128/384
kbps)
32 Interact.
PS (384/384
kbps)
For all other UeRc states the default setting can be kept, this will set the same triggering point for all
RABs, and disable
IRAT HO for the same interactive rates as in previous system releases.
Note: This information is valid when upgrading from P5 to a later release.
When both
IRAT and IF
HO are enabled, special considerations must be taken when upgrading from P5 to a later release since complete backward compatibility can not be obtained.
When using a
PS interactive connection and moving out of coverage, the
DL rate is normally switched down in steps from 384 to 128 and then to 64 kbit/s.
IRAT CC was previously never executed until a downswitch to a
DL rate of 64 kbit/s was done, but
IFHO was previously possible also for other
DL rates if bad coverage is triggered.
From a user point of view it is preferred not to make
IRAT CC too early. Assuming that the throughput is higher in
WCDMA compared to GSM/GPRS, the user should remain in the
WCDMA system as long as possible, and not perform
IRAT CC while using
DL rates of 384 or 128 kbit/s. However there is also a small risk that fast moving
UEs will drop the connection before a
HO to
GSM can be made, if the triggering is delayed until a downswitch to 64 kbit/s has been done. An
IFHO is made maintaining the same rate so the same reasoning does not apply, but the
IFHO attempt must still be triggered in time so that the call does not drop for coverage reasons.
The 2d thresholds should be set after coverage, the triggering applies to both IF and
IRAT, and for
PS interactive the offsets can also be set per rate. One strategy is to disable IF and
IRAT HO for
DL rates of 384 kbit/s, and set the offsets to normal values for
DL rates of 128 and 64 kbit/s, ie serviceOffset2dEcNo=-20 and serviceOffset2dRSCP=-50 for the following
RABs (UeRc-states):
7 Interact.
PS (64/384
kbps)
31 Interact.
PS (128/384
kbps)
32 Interact.
PS (384/384
kbps)
For other interactive
DL rates (64 and 128) the serviceOffset2dEcNo and serviceOffset2dRscp should be tuned in order to obtain wanted behavior. A rule of thumb is to set the offsets a few
dB lower than for speech. The exact values depend on many factors, for example that different
UE brands behave different.
Note: This information is valid when upgrading from P5 to a later release.
The
IRAT or
IFHO functions can be enabled on cell level. When poor connection quality has been triggered, the type of
HO to be attempted is configurable for each cell. Parameters
hoType can be set for each cell to GSM_PREFERRED, IFHO_PREFERRED, or to NONE. Parameter
hoType set to NONE means that no
IRAT or
IFHO measurement is initiated from this cell.
IRAT and IF
HO measurements cannot be done simultaneously for the same
UE. The decision whether or not to start
GSM or IF measurements, is however based on the settings for parameters
hoType and
defaultHoType (
DRNC cells) for all cells in the Active Set.
Generally,
IFHO should be enabled for border cells on an additional carrier, and
IRAT HO should be enabled for border cells on the first mainland carrier.
IRAT HO could also be enabled for core cells with coverage problems and dropped calls inside the
WCDMA system, not just for border cells.
Other strategies could be chosen for special reasons, for example, if there are substantial numbers of
UEs that are not standard compliant and do not support
IFHO. In this case,
IRAT HO could be enabled for the additional carrier border cells instead.
It should be noted that due to Iur standard limitations, the value of parameter
hoType cannot be read from
DRNC cells. The preferred
HO type can still be set for cells in a
DRNC, but not for individual cells, only for a carrier frequency. For example, parameter
defaultHoType can be set to GSM_PREFERRED for all underlaying
WCDMA mainland
DRNC cells, and to IFHO_PREFERRED for the additional
WCDMA carrier
DRNC cells.
The first step in the general tuning procedure is to locate the
WCDMA border cells and the core cells that are coverage limited and decide whether
GSM HO or
IFHO should be enabled in these core cells to reduce the dropped calls caused by the coverage limitation. For these cells the
GSM or the IF neighbor cell lists, or both, should be defined, keeping the lists short if possible and without defining unnecessary neighbor relations.
The next step is to set parameters for the
IRAT and
IFHO function. The event 2d threshold can be adjusted for each cell, and can be used if an early detection of the coverage problem is necessary in some cells or locations in order to make a successful
HO. For example, a cell that has locations where the coverage falls quickly for many users, leading to dropped calls, might need a higher threshold setting for the event 2d.Thresholds event 2f, event 2b (used frequency), and event 3a are relative thresholds to event 2d and will also be for the cell level. The relative parameter values are set on the
RNC level.
The purpose of this procedure is to decrease the amount of coverage-generated dropped calls, so that most of these calls instead can continue in
GSM or on another
WCDMA frequency, but without causing too many false triggers or too many users in compressed mode. Frequent starts and stops of compressed mode always come with a cost in terms of power and hardware resources. The dropped calls should be monitored during these procedures, and the total number of drops for each cell should be calculated before and after the
GSM or
IFHO function is enabled.
The
GSM HO function can be used to reduce dropped calls in areas where the first carrier
WCDMA coverage is limited and where there is instead good
GSM coverage. The most obvious case is the border cells of the
WCDMA system, where
WCDMA system coverage ends.
GSM HO can also be activated inside the
WCDMA system in core cells where there are obvious coverage holes resulting in dropped calls. In cells where it is decided to use
GSM HO, parameter
hoType should be set to GSM_PREFERRED and
GSM neighbor cell lists should be defined.
The
UE can measure on a maximum of 32
GSM cells. There are reasons to be restrictive when defining
GSM neighbors, and it is recommended to not define
GSM neighbors if it is not needed. The time it takes for a
UE to find a candidate
GSM cell generally increases with longer neighbor cell lists, and keeping the lists short should generally lead to less time in compressed mode and better retainability performance. If the
WCDMA coverage falls quickly, the probability of quickly finding a suitable
GSM candidate cell will increase if there are fewer
GSM cells to measure on.
Note that the introduction of priorities for neighbor cells, as described in
Section 12.1.2, are also applicable to
IRAT neighbors.
IRAT evaluation is started if
IRAT neighboring cells exist and at least one cell in the Active Set has parameters
hoType or
defaultHoType set to GSM_PREFERRED and no cell has it set to IFHO_PREFERRED. The
IRAT handover evaluation algorithm, evaluates whether
IRAT HO (
WCDMA RAN to
GSM) or
IRAT Cell Change should be proposed.
IRAT HO or Cell Change decision is based on
GSM quality measurements and
WCDMA RAN quality measurements.
The parameter thresholds used for start of
GSM measurements and
IRAT HO can and should be tuned on cell level in the network. To make it easier it is recommended to divide the cells in the network into different types and then apply different set of parameters depending on what type the cell is classified. For example, the cells can be divided into
WCDMA border cells and core cells.
The border cells are the last
WCDMA cells that have
WCDMA coverage before moving into
GSM only coverage, the outskirts or transition area of the
WCDMA coverage area.
The core cells are the cells inside the
WCDMA coverage area of the border cells. The core cells should first be evaluated to determine whether or not they should have
IRAT HO activated. The preferred choice for core cells is to have parameter
hoType set to NONE if
IRAT is not explicitly needed for coverage purposes in the cell. If
IRAT HO is needed in a core cell it should, in most cases, have lower thresholds for
GSM measurements and
IRAT HO as compared to the border cells.
There are of course exceptions to this general classification in the network and cells needing different parameter settings should of course be identified and use different settings for
IRAT performance. The decision as to which cells are to be classified as border cells and core cells must also be done and verified locally in the network.
The connection quality monitoring parameters
usedFreqThresh2dRscp,
usedFreqThresh2dEcno and when
UE Tx power reaches maximum power (event 6d) are the thresholds for detecting a coverage problem and triggers start of
GSM measurements. The event 2f parameter thresholds of
usedFreqRelThresh2fRscp +
usedFreqThresh2dRscp,
usedFreqRelThresh2fEcno +
usedFreqThresh2dEcno and
ueTxPowerThresh6b are the thresholds to stop the
GSM measurements. The parameter settings are a compromise between higher values, resulting in a larger proportion of the UE’s using compressed mode, and a lower setting, implying less time is available for making the
GSM HO if the
WCDMA signal drops rapidly.
If excessive triggering of event 2d and event 2f measurement report occurs, hysteresis values can be used together with the
GSM measurement thresholds to reduce excessive event triggering of measurement reports. For more information about hysteresis, see
Section 3.4
Note that the
WCDMA P-CPICH
Ec/No measurement quantity is load dependent and may vary up to 6–8
dB between low loaded and high loaded cells. Note also that the
UE connection may be
UL coverage limited although measured
WCDMA P-CPICH
Ec/No is high. This will typically happen at
WCDMA coverage border areas where there is no inter-cell interference from adjacent
WCDMA cells.
The
IRAT HO from
WCDMA to
GSM will be proposed (event 3a occurs) when the
WCDMA signal level goes below the values set for parameters
utranRelThresh3aRscp +
usedFreqThresh2dRscp or
utranRelThresh3aEcno +
usedFreqThresh2fEcno or
utranRelThreshRscp +
usedFreqThresh2dRscp +
utranRelThresh3aRscp, depending on what measurement quantity started the
GSM measurements, and the
GSM RSSI level is above
gsmThresh3a for a candidate
GSM cell.
The condition must be fulfilled during the time to trigger for the event.
The following parameter values can be used initially for the
WCDMA border cells (modification due to local radio condition variations not included here).
Start of
GSM measurements (if any is fulfilled):
- usedFreqThresh2dRscp = -105 dBm
- usedFreqThresh2dEcno = -13 dB
- Maximum UE Tx power is reached ( txPowerConnQualMonEnabled = TRUE)
Stop of
GSM measurements (if all are fulfilled):
- usedFreqRelThresh2fRscp + usedFreqThresh2dRscp = -102 dBm
- usedFreqRelThresh2fEcno + usedFreqThresh2dEcno = -11 dB
- ueTxPowerThresh6b = 18 dBm
Triggering
IRAT HO or Cell Change execution:
- utranRelThresh3aRscp + usedFreqThresh2dRscp = -105 dBm
- utranRelThresh3aEcno + usedFreqThresh2dEcno = -13 dB
- utranRelThreshRscp + usedFreqThresh2dRscp +
utranRelThresh3aRscp = -100 dBm
- gsmThresh3a = -95 dBm
A minimum setting for parameter
gsmThresh3a would be -102
dBm. However, it is recommended to use a setting of the initial signal strength limit in the
GSM cell to parameter
gsmThresh3a = -95
dBm. The setting defines the typical minimum acceptable cell-planned
RSSI level for the
GSM cell, and should assure that an
IRAT HO is not made to a
GSM cell when coverage is about to be lost. However, good quality in the
GSM cell is not assured by a signal strength limit, interference could also have an impact.
The parameter settings given here are the recommended initial values for
WCDMA border cells. The final setting of
IRAT parameters for border cells and core cells should be done after evaluating
IRAT,
WCDMA, and
GSM performance together to find to most suitable settings for the given radio environment in the area to optimize the user experienced performance.
Parameters in
GSM and
WCDMA should be aligned so that the desired
IRAT HO behavior is achieved and ping-pong handovers are avoided. There is still a small risk of ping-pong behavior since the
HO might be triggered differently from the respective system. For example,
WCDMA to
GSM HO might be triggered using
RSCP, while
GSM to
WCDMA HO might be triggered by load and
Ec/No. See User Description, GSM-UMTS Cell Reselection and Handover,
208/1553-HSC 103 12/7,
Reference [4] for extensive information on
GSM to
WCDMA HO.
The key parameters controlling handovers from
GSM to
WCDMA are parameters
QSC,
ISHOLEV, and
MRSL.
Parameter
QSC defines when
WCDMA neighbors will be monitored for handover. The parameter is set for each
GSM cell. It can be set in four alternative ways, so that
WCDMA neighbors are monitored as follows:
- always
- never
- when signal strength of the GSM cell is above a threshold
- when signal strength of the GSM cell is below a threshold
When deciding the setting of parameter
QSC, take into account whether or not
WCDMA and
GSM sites are co-sited.
For
WCDMA and
GSM co-sited cells, parameter
QSC could be set to ”always” or “when signal strength of
GSM cell is above a threshold” making sure that the
WCDMA cell is evaluated when well inside the
GSM cell. For non co-sited cells, parameter
QSC can be set to “always” or “when signal strength of
GSM cell is below a threshold” making sure that the
WCDMA cell is evaluated when at the
GSM cell border.
When measurements on
WCDMA have begun, two criteria must be fulfilled for a
GSM to
WCDMA IRAT HO to happen.
- Percentage of idle traffic channels (TCH) in the serving cell <= ISHOLEV
The first criteria will be fulfilled when the percentage of idle traffic channels (
TCH) in
GSM is lower than or equal to the value of parameter
ISHOLEV, which is set for each
GSM cell. When the first criterion is fulfilled, the second criterion is tested separately for each neighboring
WCDMA cell. The
WCDMA neighbors having a measured
Ec/No higher than the value of parameter
MRSL are added to the handover candidate list.
If one intends to avoid the handovers from
GSM to
WCDMA to be triggered by percentage of idle traffic channels (
TCH) in
GSM the parameter
ISHOLEV can be set to 99, which corresponds to a load higher than 1%. In practice, this turns that criterion off, and
WCDMA would then be prioritized all the time when being measured. A setting of parameter
ISHOLEV of 20, would only initiate an
IRAT HO when the percentage of idle traffic channels is below 20% (that is, corresponding to a load higher than 80%).
IRAT HO to
WCDMA will take place as soon as the
WCDMA P-CPICH
Ec/No exceeds the value set for parameter
MRSL. The value of parameter
MRSL should be set so that an
IRAT HO to
WCDMA does not result in a ping-pong handover back to
GSM. It may also be preferred not to start
GSM measurements immediately when arriving in
WCDMA. The following relation should avoid this:
MRSL >
usedFreqThresh2dEcno + an hysteresis
If
Ec/No is the most commonly triggered measurement quantity for event 2d and event 3a, then a suggested initial setting for parameter
MRSL could be -9
dB. If
RSCP is instead the most commonly triggered measurement quantity on the
WCDMA side, it is not possible to compute the relation as above, and it is suggested to set parameter
MRSL to -6
dB. This setting means that a higher
WCDMA quality is required before the
HO is attempted.
Depending on operator policy, the
GSM to
WCDMA HO could also be triggered by load in the
GSM cell, by using parameter
ISHOLEV. The default value of parameter
ISHOLEV is 20%.
With the feature Combined Handover Triggering
GSM to
WCDMA it is possible to control the measurement reporting of
WCDMA neighbouring cells. If the feature is enabled the parameter FDDREPTHR2 defines a threshold for the non reporting radio entity of the
WCDMA cells. No
WCDMA cells will be included in the measurement reports from the
MS unless the non reporting
WCDMA radio entity is above the defined threshold. Since
WCDMA cells are reported using the radio entity
CPICH Ec/No, the parameter FDDREPTHR2 is related to the
WCDMA radio entity
CPICH RSCP.
The threshold parameter FDDREPTHR2 assures a sufficient downlink signal strength of the
UTRAN cell, which in turn increases the possibility for the mobile to reach the
WCDMA cell in the uplink. The threshold parameter FDDREPTHR2 is used by
MSs being in connected mode as well as
MSs being in NC2 mode.
The setting of the FDDREPTRH2 parameter shall be set so that a handover to
WCDMA is not immediately followed by a "ping-pong" handover back to
GSM and to avoid starting
GSM measurements directly when entering
WCDMA if
IRAT handover is enabled in both directions. This is achieved if the FDDREPTHR2 parameter has the following relation to the
WCDMA parameter usedFreqThresh2dRscp:
FDDREPTHR2 > usedFreqThresh2dRscp + a hysteresis.
A recommended setting of -100dBm fulfills the relations above using a typical setting of the
WCDMA parameter usedFreqThresh2dRscp.
The
WCDMA to
GSM cell change for
PS interactive services normally experience quite long outage times before the session can be reestablished on the
GSM side. There are no normal tuning activities that can be performed in the radio network to shorten this time.
The outage time can be divided into two parts.
The first radio outage part depends largely on the
UE and consists of the time it takes for the
UE to reselect to the
GSM cell and then perform
LA and
RA updates. This typically takes 8–10 seconds.
The second part is the application outage that depends on the application, the protocol, and on the TCP/IP procedures, before the application is running normally again. For some applications, like
FTP download, this time could be, in the worst case, around 10 seconds.
When a
UE in
GSM is in packet transfer mode, it is the idle mode cell reselection parameters that control when the
IRAT cell reselection to
WCDMA will take place. Therefore, it is necessary to also verify the idle mode settings in
GSM to have a good coexistence between
WCDMA and
GSM for packet data connections.
IFHO is needed when an additional
WCDMA carrier is introduced in the system. If this additional carrier is introduced in a hot spot or in a limited cluster of cells, then
IFHO is needed where the coverage of the additional carrier ends. Users that are connected to the additional carrier, when moving out of coverage, should then make an
IFHO to the underlaying carrier. In cells where
IFHO is to be used, parameter
hoType should be set to IFHO_PREFERRED, and IF neighbor cell lists should be defined.
The function assumes that all
UEs support
IFHO within the same frequency band, according to the
3GPP standard. The
UE capability information can only be used to determine whether or not the
UE needs compressed mode when performing the IF measurement. If there are
UEs present, which are not standard compliant and do not support
IFHO, they will drop the connection if they move out of coverage of the additional carrier.
The function for distribution of traffic and load evenly between carriers is described in
Idle Mode and Common Channel Behavior and in
Load Sharing. These references give details about how the problem with the standard non-compliant
UEs can be reduced, and also how the encoded message length of System Information Block type 11 (SIB11), carrying all neighbor cell information, will increase when some idle mode parameters are changed to other values than default. This has implications on the number of neighbors to be defined.
The
UE can measure on a maximum of 32 IF cells, and on a maximum of two other non-used inter-frequencies. When an additional carrier is introduced in clusters of co-located cells, the initial IF neighbor list for the additional cell could be defined by copying the corresponding neighbor list from the co-located underlaying cell and adding the co-located neighbor.
However, if the coverage for the IF cell deteriorates quickly and it is important that the
IFHO can be performed fast, then the IF neighbor lists should be as short as possible. The time it takes for a
UE to find a candidate IF cell generally increases with longer neighbor cell lists, and keeping the list short should generally lead to less time in compressed mode and better retainability performance.
When a second carrier is deployed as a hotspot cell, two-way neighbor cell relationships should be defined only between the underlaying f1 cell and the overlaying f2 cell. One-way neighbor cell relationships are defined from the f2 cell to all the surrounding f1 cells. The main benefits with this setup are the elimination of
IFHO from the surrounding f1 cell to the f2 cell, the decreased risk of
CPM starts in the f1 layer, and the shorter neighbor lists. With one-way definitions, all surrounding f1 cells become blind to the f2 cell.
It should also be noted that the P-CPICH power settings should initially be set to the same values for the f2 cells as for the co-located f1 cells. The f2 to f2 neighbor lists for the second carrier cells could also initially be determined by using the f1 neighbor lists for the corresponding co-located cells.
The same principles with neighbor lists and power settings are also valid for carriers f3 and f4.
There are no main differencies between adding a carrier to a single
WCDMA carrier system and adding a fourth carrier to a three
WCDMA carrier system. However no more than two of the three carriers should be defined as neighbors in any case, since the
UE should not support more than two other frequencies according the
3GPP specifications. Mobility across four carriers can still be achieved by making sure the non-used frequencies has IF neighbors defined between each other. This will result in that all carriers can be reached, but in some cases it takes two
IFHO to go from one carrier to another.
Note that the introduction of priorities for neighbor cells, as described in
Section 12.1.2, are also applicable to
IFHO neighbors.
The
IFHO evaluation is started if
IFHO neighboring cells are configured and at least one cell in the Active Set has parameter
hoType or parameter
defaultHoType set to IFHO_PREFERRED. The
IFHO evaluation algorithm evaluates whether Inter-Frequency measurement will be started and based on those measurements and whether
IFHO execution should be done.
The connection quality monitoring parameters
usedFreqThresh2dRscp,
usedFreqThresh2dEcno, and when
UE Tx power reaches maximum power (event 6d) are the thresholds for detecting a coverage problem and triggers start of IF measurements. The event 2f parameter thresholds of
usedFreqRelThresh2fRscp +
usedFreqThresh2dRscp,
usedFreqRelThresh2fEcno +
usedFreqThresh2dEcno, and
ueTxPowerThresh6b are the thresholds to stop IF measurements. The parameter settings are a compromise between higher values, resulting in a larger proportion of the UE’s using compressed mode, and a lower setting, implying less time is available for making the IF handover if the
WCDMA signal drops rapidly.
If excessive triggering of event 2d and event 2f measurement report occurs, hysteresis values can be used together with the IF measurement thresholds to reduce excessive event triggering of measurement reports. For more information about hysteresis, see
Section 3.4
Note that
WCDMA P-CPICH
Ec/No measurement quantity is load dependent and may vary up to 6–8
dB between low loaded and high loaded cells. Note also that the
UE connection may be
UL coverage limited although measured
CPICH Ec/No is high. This will typically happen at
WCDMA coverage border areas where there is no inter-cell interference from adjacent
WCDMA cells.
The
IFHO from one
WCDMA carrier to another will then be proposed (event 2b occurs) when the current signal level goes below the value set for parameters
usedFreqRelThresh4_2bRscp +
usedFreqThresh2dRscp or
usedFreqRelThresh4_2bEcno +
usedFreqThresh2dEcno or
utranRelThreshRscp +
usedFreqThresh2dRscp +
usedFreqRelThresh4_2bEcno, and the level in the target IF cell is above the value set for parameters
nonUsedFreqThresh4_2bRscp or
nonUsedFreqThresh4_2bEcno , depending on what measurement quantity that started the IF measurements.
The condition must be fulfilled during the time to trigger for the event.
The following parameter values can be used initially for
WCDMA border cells:
Start of IF measurements (if any is fulfilled):
- usedFreqThresh2dRscp = -105 dBm
- usedFreqThresh2dEcno = -13 dB
- Maximum UE Tx power is reached ( txPowerConnQualMonEnabled = TRUE)
Stop of IF measurements (if all are fulfilled):
- usedFreqRelThresh2fRscp + usedFreqThresh2dRscp = -102 dBm
- usedFreqRelThresh2fEcno + usedFreqThresh2dEcno = -11 dB
- ueTxPowerThresh6b = 18 dBm
Triggering
IFHO execution:
- usedFreqRelThresh4_2bRscp + usedFreqThresh2dRscp = -105 dBm
- usedFreqRelThresh4_2bEcno + usedFreqThresh2dEcno = -13 dB
- utranRelThreshRscp + usedFreqThresh2dRscp +
usedFreqRelThresh4_2bEcno = -100 dBm
- nonUsedFreqThresh4_2bRscp = -100 dBm
- nonUsedFreqThresh4_2bEcno = -10 dB
The
IFHO from one
WCDMA carrier to another will then be proposed (event 2b occurs) when the current signal level goes below the used frequency threshold, and the level in the target IF cells is above the non-used frequency threshold.
The thresholds for the target non-used frequency could be set as a minimum acceptable quality, for example
RSCP -105
dBm or
Ec/No -13
dB. But this low setting might lead to that a new event 2d, compressed mode, and an
IFHO attempt is immediately triggered after the
IFHO to the new frequency. To avoid this, the target minimum quality could be set higher, for example
RSCP -100
dBm or
Ec/No -10
dB. Since only the event 2d thresholds can be set for each cell, these non-used frequency
IFHO thresholds have to be set considering all cells where
IFHO is enabled.
Service Based Handover forces
UE on dedicated channels using a “speech only” service, to move from
WCDMA RAN coverage to
GSM network coverage; thus allowing the operator to redirect speech users to
GSM using a Service Indicator (
SI) that can be set for each subscriber.
For service based handover to be initiated in a cell, parameter
hoType in the particular cell must be set to GSM_PREFERRED or IFHO_PREFERRED. If parameter
hoType is set to NONE, no service based handover to
GSM attempt will be initiated. If service based handover to
GSM is to be used in all cells,
IRAT activity cannot be turned off by setting parameter
hoType to NONE. Instead lower
IRAT thresholds for event 2d and event 3a must be deployed in the cells to minimize
GSM measurements and
IRAT HO.
It should be noted that all descriptions and recommendations given in this section are valid for both
HSDPA Mobility Phase 1 and 2.
When the
UE moves between cells that are
HSDPA enabled (that is, when
hsdpaCapability = HSDPA_CAPABLE), the
HSDPA connection is maintained by means of the serving
HS-DSCH cell change functionality, shortly,
HS cell change.
HS-DSCH does not use soft handover as the dedicated channels (
DCH) do. There is a trade-off between optimizing the radio quality of
HS-DSCH (that is, frequent enough cell changes) and minimizing the impact on throughput at cell change (that is, as few cell changes as possible).
Serving
HS cell change is made between
AS cells, which have A-DCH connections, and it is triggered by the soft/softer handover evaluation of A-DCH.
HS cell change is evaluated only if parameter
hsCellChangeAllowed is set to TRUE. Its default value is FALSE. It is important not to forget to enable
HS cell change by using this parameter, since keeping the default value causes throughput degradation and extra signaling for a moving
UE. If this parameter is set to FALSE and the
UE moves away from its current cell, then
RNC will attempt to reconfigure to
DCH instead.
The reconfiguration triggered by poor connection quality must not be enabled, except when
HSDPA is deployed on both the first and the second carrier, and
IFHO via reconfiguration to
DCH is triggered. The reason being that coverage of
HSDPA, enabling higher throughput than
DCH and its associated compressed mode procedures, is at least as good as
DCH. A
HSDPA connection being maintained at the cell border would experience superior throughput performance on
HSDPA compared with being reconfigured to
DCH. The outage time is only slightly shorter when being reconfigured to
DCH, and the
IFHO is performed. In the
IRAT case, the
HSDPA coverage can really be limited in border cells if event 2d is tuned for speech service and
IRAT when
hsToDch.poorQualityDetected is enabled. The
UE leaves
HSDPA coverage for
GSM too early and experience lower throughput.
In summary, the following recommendation on multi-valued parameter
hsToDchTrigger is:
- poorQualityDetected = OFF, except when HSDPA is deployed on both the first and the second carrier
The
UE measurement criterion for
HS cell change is determined by parameter
hsQualityEstimate. It is recommended to keep the default value of this parameter, which is CPICH_RSCP, instead of CPICH_Ec/No, in order to have a more stable behavior (avoiding ping-pong situations) as
CPICH RSCP is not load dependent and fluctuates less than
Ec/No.
Another reason for avoiding CPICH_Ec/No as a quality measurement is that
Ec/No degrades in cells carrying
HSDPA traffic: after an
HS cell change,
Ec/No of the old serving
HS cell improves whereas that of the new serving
HS cell suddenly becomes worse. This might cause undesired ping-pong behavior.
A-DCH soft/softer
HO evaluation is performed as for
DCH except that there is a new event called 1d
HS that is similar to event 1d but with a new set of parameters, namely
hsHysteresis1d and
hsTimeToTrigger1d, and with a new measurement quality,
CPICH RSCP. When the
CPICH RSCP of a cell in the
AS becomes stronger than the best cell’s CPICH_RSCP +
hsHysteresis1d/2, event 1d
HS occurs, which means that the best cell is replaced by a new best cell.
The reason for having a separate event 1d
HS is to be able to get
UE reports triggered by
AS cells only and to be able to use a different quality measurement with different parameter values than the ones used for the soft handover event 1d.
Serving
HS cell change can be triggered by event 1d
HS, event 1b, or event 1c. Note that event 1d
HS is based on
hsQualityEstimate = CPICH_RSCP measurements by default, whereas events 1b and 1c are based on
measQuantity1, which is by default CPICH_Ec/No.
Results from field measurements have shown an
Ec/No degradation in cells carrying
HSDPA traffic. In the worst case, when measuring in the same good radio environment as the
HSDPA UE is placed, degradation in the order of a couple of
dB can be experienced. When measuring the degradation close to the cell border, where the fluctuations in
Ec/No can impact handover and cell reselection, values in the order of only 1dB or less are measured. This last scenario is the only one potentially impacting traffic distributions in the cell and surrounding neighbors, and therefore the most relevant. The minor
Ec/No fluctuations could have an impact on cell borders and consequently on all functions having
Ec/No as triggering criterion, in networks where
HSDPA is deployed on the same frequency as R99. This could in some cases lead to the
Ec/No threshold for IF measurements and
GSM measurements being modified in affected cells to a lower level, in order to avoid unnecessary triggering due to fluctuating
Ec/No levels from
HSDPA load in the network.
It should be noted that all descriptions and recommendations given in this section are valid for
HSDPA Mobility Phase 1 and 2 combined with
EUL.
EUL serving cell and
HSDPA serving cell are identical, and determined by the same mobility event 1d
HS.
For the uplink throughput, the
Ec/No triggering of event 1d
HS (parameter
hsQualityEstimate) shows slightly better throughput generally in field tests. This is not surprising, since the scheduler grants bit rate based on the “load” quantity, which is directly dependent on interference, that is
Ec/No. The highest throughput is obtained by a fast setting of the triggering parameters
hsHysteresis1d and
hsTimeToTrigger1d and
Ec/No triggering.
Note that the consideration above does not regard the downlink. Event 1d
HS controls change of serving cell, which is valid for downlink as well as uplink. The
HSDPA downlink data channel,
HS-DSCH, cannot operate in soft handover. Therefore, and ideally,
HSDPA would like a slow setting of the serving cell change to minimize the number of downlink channel reconfigurations. Each cell change produces a short transmission gap in the downlink.
EUL, on the other hand, which indeed operates in soft handover, needs a fast setting to optimize throughput. The highest uplink throughput is obtained by the best cell from the uplink point of view, which is not always identical to the serving cell, which is determined from downlink measurements in the
UE.
EUL needs a relatively fast triggering of serving cell change to counteract these effects.
Thus, to properly optimize the parameters controlling event 1d
HS,
HSDPA as well as
EUL need to be considered. Meanwhile, the default setting shows adequate performance.
An extremely “slow” setting of the parameters for 1d
RNC will make the connection drag well into the non-EUL capable cell before that cell is brought into the active set. The
UE output power will increase. On the other hand, the fact that the connection is retained longer on an
E-DCH means that the higher throughput potential on
E-DCH can be utilized and maintained longer.
If all sites are
EUL enabled, 1d
RNC need only happen at
RNC borders. The setting of the 1d
RNC parameters might then need to consider the general mobility strategy. From a pure
EUL perspective, a “fast” setting of the parameters for 1d
RNC is recommended in case
hsToDchTrigger.servHsChangeInterRnc is set to OFF. Such a configuration makes
EUL pick up again as soon as possible on the other side of the
RNC border. If
hsToDchTrigger.servHsChangeInterRnc is set to ON, a “slow” setting is recommended so that
EUL is maintained longer.
A proper setting of the parameters is a balance between the increased interference and the higher throughput potential on
E-DCH. It is recommended to let the concern about interference be the determining factor for the setting. Thus the default setting, which is a fast setting, is recommended. Note that the downlink also needs to be considered when choosing values for parameter
hsToDchTrigger.
This section lists the parameters that affect the behavior of the handover algorithms and functions. Some of them are radio network parameters, allowing the operator to manage the behavior of these functions in the whole radio network. Others relate to quantities connected to individual cells, allowing management of behavior at cell level. To change the default value of a parameter, the operator must use
OSS-RC. See
Radio Network Parameters (86/1553–HSD 101 02/7) for the corresponding
OSS-RC parameter window and name.
Unless specifically stated, the parameter setting is valid for all cells and relations in an
RNC.
cnhhoSupp
[
CNHHO Support]
| Description: | Indicates whether the CNHHO is activated in the RNC. It applies for both Source and Target RNC. |
| Range: | FALSE; TRUE |
| Default: | FALSE |
| Resolution: | Not Applicable |
cellCapability
HS and
EUL Iur mobility
| Description: | Defines for External Utran Cells if this DRNC cell supports HSDPA, both EUL and HSDPA, or also EUL 2 ms TTI. If edchSupport is set to On then hsdschSupport must also be set to On. |
| Range: | hsdschSupport On / Off
edchSupport On / Off
edchTti2Support On/Off |
| Default: | Off |
| Resolution: | Not Applicable |
cellCapabilityControl
HS and
EUL Iur mobility
| Description: | Defines for each Iur link if the DRNC supports HSDPA, both EUL and HSDPA, or also EUL 2 ms TTI. If edchSupport is set to On then hsdschSupport must also be set to On. |
| Range: | hsdschSupport On / Off
edchSupport On / Off
edchTti2Support On/Off |
| Default: | Off |
| Resolution: | Not Applicable |
defaultHoType
[Handover type per
DRNC per carrier
| Description: | Indicates per carrier for DRNCs if GSM HO, IFHO or no HO shall be attempted, in case both Inter-RAT HO, and Inter-Frequency HO are possible. This parameter can be defined for each DRNC and each used carrier, together with freqBand and uarfcnDl. If not defined a default value of GSM_PREFERRED is used. |
| Range: | IFHO_PREFERRED; GSM_PREFERRED; NONE |
| Default: | GSM_PREFERRED |
| Resolution: | Not Applicable |
event1dRncOffset
[event1dRncOffset]
| Description: | Specifies how much stronger than the serving cell that the 1a/1c event reports from a cell that does not have the same EUL capability must be to trigger the calculated event. |
| Range: | -25 to 25 |
| Default: | 0 |
| Resolution: | 1 |
event1dRncThreshold
[event1dRncThreshold]
| Description: | Specifies how many 1a/1c event reports for the same cell that does not have the same EUL capability that must be received to trigger the calculated event. |
| Range: | 0..60 |
| Default: | 4 |
| Resolution: | 1 |
fddGsmHOSupp
[
FDD GSM handover support]
| Description: | Indicates if the RNC supports Inter-RAT Handover. |
| Range: | FALSE; TRUE |
| Default: | FALSE |
| Resolution: | Not Applicable |
fddIFHOSupp
[
FDD Inter-Frequency handover support]
| Description: | Indicates if the RNC supports Inter-Frequency Handover. |
| Range: | FALSE; TRUE |
| Default: | FALSE |
| Resolution: | Not Applicable |
filterCoefficient1
[Filter Coefficient for 1.x events]
| Description: | Coefficient for layer 3 filtering before intra- frequency reporting evaluation. |
| Range: | 0...9, 11, 13, 15, 17, 19 |
| Default: | 2 |
| Resolution: | 1 |
filterCoefficient2
[Filter Coefficient for 2.x events]
| Description: | Coefficient for layer 3 filtering before inter- frequency reporting evaluation. |
| Range: | 0...9, 11, 13, 15, 17, 19 |
| Default: | 2 |
| Resolution: | 1 |
filterCoeff4_2b
[Filter Coefficient for measurement 4 event 2b]
| Description: | Coefficient for layer 3 filtering before inter- frequency reporting evaluation, for measurement 4 event 2b. |
| Range: | 0...9, 11, 13, 15, 17, 19 |
| Default: | 2 |
| Resolution: | 1 |
filterCoeff6
[Filter Coefficient for 6d/6b events]
| Description: | Coefficient for layer 3 filtering before UE internal measurement reporting evaluation. |
| Range: | 0...9, 11, 13, 15, 17, 19 |
| Default: | 19 |
| Resolution: | 1 |
freqBand
[Frequency band per
RNC per carrier
| Description: | Indicates per carrier what 3GPP frequency band it belongs to. Should be defined if the system is using more than one Band. |
| Range: | 0..22.
0 = Not defined
1 = 3GPP Band I
2 = 3GPP Band II
3 = 3GPP Band III
4= 3GPP Band VI Note !
5 = 3GPP Band IV Note !
6 = 3GPP Band V Note !
7 = 3GPP Band VII
8..22 = 3GPP Band VII — Band XXII |
| Default: | 0 |
| Resolution: | Not Applicable |
gsmAmountPropRepeat
[
GSM amount proposal repeat]
| Description: | Maximum number of repeated proposals (not including the first proposal) of GSM cells for handover based on the same MEASUREMENT REPORT. |
| Range: | 0 – 25 |
| Default: | 4 |
| Resolution: | 1 |
gsmFilterCoefficient3
[
GSM Filter Coefficient for 3a event]
| Description: | Coefficient for layer 3 filtering of GSM quality before inter-RAT reporting evaluation. |
| Range: | 0...9, 11, 13, 15, 17, 19 |
| Default: | 1 |
| Resolution: | 1 |
gsmPropRepeatInterval
[
GSM proposal time interval]
| Description: | Minimum time interval between proposals of the same GSM cell for handover based on the same MEASUREMENT REPORT. |
| Range: | 0 – 5 s |
| Default: | 1.0 s |
| Resolution: | 0.2 s |
gsmThresh3a
[
GSM threshold 3a]
| Description: | Threshold for event 3a (the estimated quality of the currently used WCDMA RAN frequency is below a certain threshold and the estimated quality of the GSM system is above a certain threshold) for GSM. |
| Range: | Range is valid for GSM carrier RSSI. -115 – 0 dBm |
| Default: | -102 dBm |
| Resolution: | 1 dBm |
hoType
[Handover Type]
| Description: | Indicates if Inter-RAT HO, Inter-Frequency Handover, or None shall be evaluated in case both Inter-RAT HO and Inter-Frequency HO are possible. |
| Range: | IFHO_PREFERRED; GSM_PREFERRED; NONE |
| Default: | GSM_PREFERRED |
| Resolution: | Not Applicable |
| Scope | Cell |
hsCellChangeAllowed
[
HS Cell Change Allowed]
| Description: | Turns serving HS-DSCH Cell Change on or off. |
| Range: | FALSE; TRUE |
| Default: | FALSE |
| Resolution: | N/A |
hsHysteresis1d
[
HS Hysteresis 1d]
| Description: | Sets the event 1d HS hysteresis value specific for HS-DSCH connections. |
| Range: | 0 – 7.5dB |
| Default: | 1 dB |
| Resolution: | 0.1 dB |
hsQualityEstimate
[
HS Quality Estimate]
hsTimeToTrigger1d
[
HS Time To Trigger 1d]
| Description: | Sets the event 1d HS Time to Trigger value specific for HS-DSCH connections. |
| Range: | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 |
| Default: | 640 ms |
| Resolution: | Not Applicable |
hsToDchTrigger
[
HS to
DCH trigger allowed]
| Description: | Multi-valued parameter that allows or disables transitions to DCH for different trigger cases: changeOfBestCellIntraRnc, poorQualityDetected, servHsChangeIntraRnc, servHsChangeInterRnc, changeofBestCellInterRnc. |
| Range: | ON=1; OFF=0 |
| Default: | OFF |
| Resolution: | Not Applicable |
hysteresis1a
[Hysteresis 1a]
| Description: | Hysteresis used for event 1a. |
| Range: | 0 — 7.5 dB |
| Default: | 0 dB |
| Resolution: | 0.5 dB |
| Note: | This parameter is NOT OSS-RC GUI supported. |
hysteresis1b
[Hysteresis 1b]
| Description: | Hysteresis used for event 1b. |
| Range: | 0 — 7.5 dB |
| Default: | 0 dB |
| Resolution: | 0.5 dB |
| Note: | This parameter is NOT OSS-RC GUI supported. |
hyst4_2b
[Hysteresis 2b]
| Description: | Hysteresis used for event 2b supporting Inter-Frequency evaluation. |
| Range: | 0 – 7.5 dB |
| Default: | 1 dB |
| Resolution: | 0.1 dB |
hysteresis1c
[Hysteresis 1c]
| Description: | Hysteresis used in replacement threshold in evaluation criteria for event 1c. |
| Range: | 0 – 7.5 dB |
| Default: | 1 dB |
| Resolution: | 0.5 dB |
hysteresis1d
[Hysteresis 1d]
| Description: | Hysteresis used in replacement threshold in drop window in evaluation criteria for event 1d. |
| Range: | 0 – 7.5 dB |
| Default: | 7.5 dB |
| Resolution: | 0.5 dB |
hysteresis2d
[Hysteresis 2d]
| Description: | Hysteresis used for event 2d. |
| Range: | 0 – 14.5 dB |
| Default: | 0 dB |
| Resolution: | 0.5 dB |
hysteresis2f
[Hysteresis2f]
| Description: | Hysteresis used for event 2f. |
| Range: | 0 – 14.5 dB |
| Default: | 0 dB |
| Resolution: | 0.5 dB |
hysteresis3a
[Hysteresis 3a]
| Description: | Hysteresis used for event 3a. |
| Range: | 0 – 7.5 dB |
| Default: | 0 dB |
| Resolution: | 0.5 dB |
ifHoAmountPropRepeat
[Inter-Frequency
HO amount proposal repeat]
| Description: | Maximum number of repeated proposals of non-used frequency cell(s) for handover based on the same MEASUREMENT
REPORT, not including the first attempt. |
| Range: | 0 – 25 |
| Default: | 4 |
| Resolution: | 1 |
ifHoPropRepeatInterval
[Inter-Frequency
HO proposal time interval]
| Description: | Minimum time interval between proposals of the same non-used frequency cell for handover based on the same MEASUREMENT REPORT. |
| Range: | 0 – 5 s |
| Default: | 1.0 s |
| Resolution: | 0.2 s |
individualOffset
[Cell Individual offset, serving cell]
| Description: | Cell parameter. The offset is added to the measured quantity before the UE evaluates whether an event has occurred. Improper use of non-default values may result in instability and unequal cell borders. |
| Range: | -10 – 10 dB |
| Default: | 0 dB |
| Resolution: | WCDMA RAN cells: 0.5 dB |
| Scope | Cell |
individualOffset
[Cell Individual offset, adjacent
WCDMA cell]
| Description: | Cell parameter. The offset is added to the measured quantity before the UE evaluates whether an event has occurred. Improper use of non-default values may result in instability and unequal cell borders. |
| Range: | -10 – 10 dB |
| Default: | 0 dB |
| Resolution: | 0.5 dB |
| Scope | Cell |
individualOffset
[Cell Individual offset, adjacent
GSM cell]
| Description: | Cell parameter. The offset is added to the measured quantity before the UE evaluates whether an event has occurred. Improper use of non-default values may result in instability and unequal cell borders. |
| Range: | -5 – 5dB |
| Default: | 0 dB |
| Resolution: | 0.5 dB |
| Scope | Cell |
intraFreqCnhhoPenalty
[Intra Frequency
CNHHO penalty]
| Description: | Defines the 'penalty' given to a 'Non-Iur External UTRAN' cell compared to a normal intra-frequency cell for the event 1a, 1c and 1d. |
| Range: | 0 – 25.0 dB |
| Default: | 3 dB |
| Resolution: | 0.5 dB |
intraFreqCnhhoWeight
[Intra Frequency
CNHHO weight]
| Description: | Scale number that defines the weight of the radio links in the active set, when comparing them to an intra-frequency CNHHO candidate. intraFreqCnhhoWeight=0 means that only the best cell in AS is considered, intraFreqCnhhoWeight>0 means that all radio links in the active set are considered, while intraFreqCnhhoWeight=1 means that all radio links in the active set are given equal importance. |
| Range: | 0 – 1 |
| Default: | 0 |
| Resolution: | 0.1 |
interFreqCnhhoPenaltyEcno
[Inter Frequency
CNHHO penalty
Ec/No]
| Description: | Defines how much penalty is given to a 'Non-Iur External UTRAN' cell compared to a normal inter-frequency cell during Ec/No evaluation. |
| Range: | 0 – 25.0 dB |
| Default: | 3 dB |
| Resolution: | 0.5 |
interFreqCnhhoPenaltyRscp
[Intra Frequency
CNHHO penalty
RSCP]
| Description: | Defines how much penalty is given to a 'Non-Iur External UTRAN' cell compared to a normal inter-frequency cell during RSCP evaluation. |
| Range: | 0 – 25.0 dB |
| Default: | 3 dB |
| Resolution: | 0.5 |
maxActiveSet
[Max. cells in Active Set]
| Description: | Maximum number of cells allowed in the Active Set. Used in the RNC evaluations of event 1a, 1c, and 1d. If the number of cells in the Active Set is equal to maxActiveSet, the handover evaluation algorithm proposes a cell replacement (event 1c and 1d); otherwise, it proposes a cell addition (event 1a). |
| Range: | 2 – 4 |
| Default: | 3 |
| Resolution: | 1 |
maxIefMonSubset
[Maximum
IEF monitored subset]
| Description: | Maximum number of inter-frequency WCDMA RAN cells that the UE will measure on. |
| Range: | 1 – 32 |
| Default: | 32 |
| Resolution: | 1 cell |
maxGsmMonSubset
[Maximum
GSM monitored subset]
| Description: | Maximum number of GSM cells that the UE will measure on. |
| Range: | 1 – 32 |
| Default: | 32 |
| Resolution: | 1 cell |
measQuantity1
[Meas. Quantity]
| Description: | Defines the measurement quantity for intra-frequency reporting evaluation. |
| Range: | Enum {CPICH Ec/No, CPICH RSCP} |
| Default: | CPICH Ec/No |
| Resolution: | N/A |
nonUsedFreqThresh4_2bEcno
[non-used frequency threshold for event 2b
CPICH Ec/No]
| Description: | Threshold for event 2b for the non-used frequency when measurement quantity is Ec/No. |
| Range: | -24 dB – 0 dB, Range is valid for CPICH Ec/No
|
| Default: | -13 dB
|
| Resolution: | 1dB |
nonUsedFreqThresh4_2bRscp
[non-used frequency threshold for event 2b
CPICH RSCP]
| Description: | Threshold for event 2b for the non-used frequency when measurement quantity is RSCP. |
| Range: | -115 dBm – 25 dBm, Range is valid for CPICH RSCP |
| Default: | -105 dBm |
| Resolution: | 1 dBm |
nonUsedFreqThreshW4_2b
[non-used frequency threshold for event 2b weighting factor]
| Description: | Weighting factor for event 2b for the non-used frequencies. |
| Range: | 0.0 ... 2.0 |
| Default: | 0.0 |
| Resolution: | 1 |
releaseConnOffset
[Release Connection Offset]
| Description: | If UE enters a new cell area, and the quality Ec/No of the new cell is ReleaseConnOffset dB above the quality of the best cell in the Active Set, and for any reason, the new cell cannot be included in the Active Set, then the call shall be released.
The reason is that it is not permitted to stay (with an established connection) in a cell area without being power controlled by the cell serving that area. The UE may cause interference in the uplink. |
| Range: | -3 — +25 dB |
| Default: | 12 dB |
| Resolution: | 0.5 dB |
| Note: | This parameter is NOT OSS-RC GUI supported. |
reportingInterval1a
[Reporting interval 1a]
| Description: | Time between periodic reports at event-triggered periodic reporting for event 1a. |
| Range: | No reporting; 0.25; 0.5; 1; 2; 4; 8; 16 |
| Default: | 1 s |
| Resolution: | Not Applicable |
| Note: | This parameter is NOT OSS-RC GUI supported. |
reportingInterval1c
[Reporting interval 1b]
| Description: | Time between periodic reports at event-triggered periodic reporting for event 1c. |
| Range: | No reporting; 0.25; 0.5; 1; 2; 4; 8; 16 |
| Default: | 1 s |
| Resolution: | Not Applicable |
| Note: | This parameter is NOT OSS-RC GUI supported. |
reportingRange1a
[Reporting range 1a]
| Description: | Relative threshold referred to the CPICH of the best cell in the Active Set used as evaluation criteria for event 1a (a primary CPICH enters the reporting range). |
| Range: | 0 – 14.5 dB |
| Default: | 3.0 dB |
| Resolution: | 0.5 dB |
reportingRange1b
[Reporting range 1b]
| Description: | Relative threshold referred to CPICH of the best cell in the Active Set used as evaluation criteria for event 1b (a primary CPICH leaves the reporting range). |
| Range: | 0 – 14.5 dB |
| Default: | 5.0 dB |
| Resolution: | 0.5 dB |
selectionPriority
[Selection Priority]
| Description: | Defines the priority for a neighbor cell. 1 is the highest priority, ie most important neighbor, while a large number means a low priority. If no value or a value of 0 is entered when a neighbor is defined, the system will automatically set it to the currently highest used value of selectionPriority, + 1, ie to the currently lowest prio definition for the source cell. |
| Range: | 0 – Large Integer |
| Default: | 0 |
| Resolution: | 1 |
selHoSup
[Selective Handover]
| Description: | Indicates if Selective Handover is supported. |
| Range: | FALSE; TRUE |
| Default: | FALSE |
| Resolution: | N/A |
serviceOffset2dEcno
[Coverage trigger offset per UeRc]
| Description: | Offset per UeRc-state that is added to the 2d, 2f, 3a and 2b Ec/No thresholds. |
| Range: | -20 .. 20 |
| Default: | 0 |
| Resolution: | 1 |
serviceOffset2dRscp
[Covergae trigger offset per UeRc]
| Description: | Offset per UeRc state that is added to the 2d, 2f, 3a and 2b Rscp thresholds. |
| Range: | -50 .. 50 |
| Default: | 0 |
| Resolution: | 1 |
timeToTrigger1a
[Time to Trigger 1a]
| Description: | Interval time. If event 1a condition is fulfilled during at least a time greater than or equal to timeToTrigger1a milliseconds, then event 1a occurs. |
| Range: | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 ms |
| Default: | 320 ms |
| Resolution: | Not Applicable |
| Note: | This parameter is NOT OSS-RC GUI supported. |
timeToTrigger1b
[Time to Trigger 1b]
| Description: | Interval time. If event 1b condition is fulfilled during at least a time greater than or equal to timeToTrigger1b milliseconds, then event 1b occurs. |
| Range: | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 ms |
| Default: | 640 ms |
| Resolution: | Not Applicable |
| Note: | This parameter is NOT OSS-RC GUI supported. |
timeToTrigger1c
[Time to Trigger 1c]
| Description: | Interval time. If event 1c condition is fulfilled during at least a time greater than or equal to timeToTrigger1c milliseconds, then event 1c occurs. |
| Range: | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 ms |
| Default: | 320 ms |
| Resolution: | Not Applicable |
| Note: | This parameter is NOT OSS-RC GUI supported. |
timeToTrigger1d
[Time to Trigger 1d]
| Description: | Interval time. If event 1d condition is fulfilled during at least a time greater than or equal to timeToTrigger1d milliseconds, then event 1d occurs. |
| Range: | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 ms |
| Default: | 2560 ms |
| Resolution: | Not Applicable |
| Note: | This parameter is NOT OSS-RC GUI supported. |
timeToTrigger2dEcno
[Time to Trigger 2d]
| Description: | Interval time between detection of event 2d and sending of the measurement report, when the measurement quantity is CPICH EC/NO. If event 2d condition is fulfilled during at least a time greater than or equal to timeToTrigger2dEcno milliseconds, then event 2d occurs. A setting of 5000 disables the 2d Ec/No measurement. |
| Range: | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 ms |
| Default: | 320 ms |
| Resolution: | Not Applicable |
| Note: | This parameter is NOT OSS-RC GUI supported. |
timeToTrigger2dRscp
[Time to Trigger 2d]
| Description: | Interval time between detection of event 2d and sending of the measurement report, when the measurement quantity is CPICH RSCP. If event 2d condition is fulfilled during at least a time greater than or equal to timeToTrigger2dRscp milliseconds, then event 2d occurs. A setting of 5000 disables the 2d Rscp measurement. |
| Range: | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 ms |
| Default: | 320 ms |
| Resolution: | Not Applicable |
| Note: | This parameter is NOT OSS-RC GUI supported. |
timeToTrigger2fEcno
[Time to Trigger 2f]
| Description: | Interval time between detection of event 2f and sending of the measurement report, when the measurement quantity is CPICH EC/NO. If event 2f condition is fulfilled during at least a time greater than or equal to timeToTrigger2fEcno milliseconds, then event 2f occurs. |
| Range: | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 ms |
| Default: | 1280 ms |
| Resolution: | Not Applicable |
| Note: | This parameter is NOT OSS-RC GUI supported. |
timeToTrigger2fRscp
[Time to Trigger 2f]
| Description: | Interval time between detection of event 2f and sending of the measurement report, when the measurement quantity is CPICH RSCP. If event 2f condition is fulfilled during at least a time greater than or equal to timeToTrigger2fRscp milliseconds, then event 2f occurs. |
| Range: | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 ms |
| Default: | 1280 ms |
| Resolution: | Not Applicable |
| Note: | This parameter is NOT OSS-RC GUI supported. |
timeToTrigger3a
[Time to Trigger 3a]
| Description: | Interval time. If event 3a condition is fulfilled during at least a time greater than or equal to timeToTrigger3a milliseconds, then event 3a occurs. |
| Range: | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 ms |
| Default: | 100 ms |
| Resolution: | Not Applicable |
| Note: | This parameter is NOT OSS-RC GUI supported. |
timeTrigg6d
[Time to Trigger 6d]
| Description: | Interval time. If event 6d condition is fulfilled during at least a time greater than or equal to timeTrigg6d milliseconds, then event 6d occurs. |
| Range: | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 ms |
| Default: | 320 ms |
| Resolution: | Not Applicable |
| Note: | This parameter is NOT OSS-RC GUI supported. |
timeTrigg6b
[Time to Trigger 6b]
| Description: | Interval time. If event 6b condition is fulfilled during at least a time greater than or equal to timeTrigg6b milliseconds, then event 6b occurs. |
| Range: | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 ms |
| Default: | 1280 ms |
| Resolution: | Not Applicable |
| Note: | This parameter is NOT OSS-RC GUI supported. |
timeTrigg4_2b
[Time to Trigger 2b fo rmaeasurment 4]
| Description: | Time between detection of event 2b and sending of mesurement report, for measurement 4. |
| Range: | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 ms |
| Default: | 100 ms |
| Resolution: | Not Applicable |
| Note: | This parameter is NOT OSS-RC GUI supported. |
txPowerConnQualMonEnabled
[Ue Tx power Connection Quality Monitoring Enabled]
| Description: | Enables or disables the connection quality monitoring based on UE Tx power. |
| Range: | TRUE, FALSE |
| Default: | TRUE |
| Resolution: | Not Applicable |
| Note: | This parameter is NOT OSS-RC GUI supported. |
uarfcnDl
[Utran absolute radio frequency channel number
DL
| Description: | Can be defined per carrier and RNC together with freqBand. Should be defined if the system is using more than one 3GPP Frequency Band. |
| Range: | 0..16383 |
| Default: | Not applicable |
| Resolution: | The mapping from channel number to physical frequency is described in 3GPP specification TS 25.104. |
ueTxPowerThresh6b
[
UE TX Power Threshold event 6b]
| Description: | The threshold used for trigger event 6b when UE TX power becomes less than an absolute threshold. |
| Range: | -50 dBm — +33 dBm |
| Default: | +18 dBm |
| Resolution: | 1 dBm |
usedFreqThresh2dEcno
[Threshold used freq. 2d (
Ec/No)]
| Description: | Threshold for event 2d (the estimated quality of the currently used WCDMA RAN frequency is below a certain threshold). Used if measurement quantity is configured to be Ec/No. |
| Range: | Valid range for CPICH Ec/No. -24 – 0 dB |
| Default: | -12 dB |
| Resolution: | 1 dB |
| Scope | Cell |
usedFreqThresh2dRscp
[Threshold used freq. 2d (
RSCP)]
| Description: | Threshold for event 2d (the estimated power level of the currently used WCDMA RAN frequency is below a certain threshold).
Used if measurement quantity is configured to be Rscp. |
| Range: | Valid range for CPICH Rscp. -115 — -25 dBm |
| Default: | -97 dBm |
| Resolution: | 1 dBm |
| Scope | Cell |
usedFreqThresh2dEcnoDrnc
[Threshold used freq. 2d
DRNC (
Ec/No)]
| Description: | Threshold for event 2d (the estimated quality of the currently used WCDMA RAN frequency for cells located in DRNC is below a certain threshold). Used if measurement quantity is configured to be Ec/No. |
| Range: | Valid range for CPICH Ec/No. -24 – 0 dB |
| Default: | -12 dB |
| Resolution: | 1 dB |
usedFreqThresh2dRscpDrnc
[Threshold used freq. 2d
DRNC (
RSCP)]
| Description: | Threshold for event 2d (the estimated power level of the currently used WCDMA RAN frequency for cells located in DRNC is below a certain threshold).
Used if measurement quantity is configured to be Rscp. |
| Range: | Valid range for CPICH Rscp. -115 — -25 dBm |
| Default: | -97 dBm |
| Resolution: | 1 dBm |
usedFreqRelThresh4_2bEcno
[used frequency relative threshold for event 2b
CPICH Ec/No]
| Description: | Relative threshold for event 2b versus event 2d for the used frequency (the estimated quality of the currently used frequency is below a certain threshold + usedFreqThresh2dEcno and the estimated quality of a non-used frequency is above a certain threshold), when the 2d measurement quantity is Ec/No. |
| Range: | -10 dB – 10 dB, Range is valid for CPICH Ec/No
|
| Default: | -1 dB |
| Resolution: | 1dB |
usedFreqRelThresh4_2bRscp
[Used frequency relative threshold for event 2b
CPICH RSCP]
| Description: | Relative threshold for event 2b versus event 2d for the used frequency (the estimated quality of the currently used frequency is below a certain threshold + usedFreqThresh2dRscp and the estimated quality of a non-used frequency is above a certain threshold), when 2d measurement quantity is RSCP. |
| Range: | -20 dB – 20 dB, Range is valid for CPICH RSCP |
| Default: | -3 dB |
| Resolution: | 1 dB |
usedFreqRelThresh2fEcno
[Relative Threshold used freq. 2f (
Ec/No)]
| Description: | Relative threshold for event 2f versus event 2d. The estimated quality of the currently used WCDMA RAN frequency is above a certain threshold + usedFreqThresh2dEcno .
Used if measurement quantity is configured to be Ec/No. |
| Range: | 0 – 20 dB |
| Default: | 1 dB |
| Resolution: | 1 dB |
usedFreqRelThresh2fRscp
[Relative threshold used freq. 2f (
RSCP)]
| Description: | Relative threshold for event 2f versus event 2d. The estimated quality of the currently used WCDMA RAN frequency is above a certain threshold + usedFreqThresh2dRscp .
Used if measurement quantity is configured to be RSCP. |
| Range: | 0 – 20 dB |
| Default: | 3 dB |
| Resolution: | 1 dB |
usedFreqW2d
[used frequency threshold for event 2d weighting factor]
| Description: | Weighting factor for event 2d for the used frequency. |
| Range: | 0.0 ... 2.0 |
| Default: | 0.0 |
| Resolution: | 1 |
usedFreqW2f
[used frequency threshold for event 2f weighting factor]
| Description: | Weighting factor for event 2f for the used frequency. |
| Range: | 0.0 ... 2.0 |
| Default: | 0.0 |
| Resolution: | 1 |
usedFreqW4_2b
[used frequency threshold for event 2b weighting factor]
| Description: | Weighting factor for event 2b for the currently used frequency. |
| Range: | 0.0 ... 2.0 |
| Default: | 0.0 |
| Resolution: | 1 |
utranFilterCoefficient3
[Utran Filter Coefficient for 3a event]
| Description: | Coefficient for layer 3 filtering of UTRAN quality before inter-RAT reporting evaluation. |
| Range: | 0...9, 11, 13, 15, 17, 19 |
| Default: | 2 |
| Resolution: | 1 |
utranRelThresh3aEcno
[
UTRAN relative threshold 3a (
Ec/No)]
| Description: | Relative threshold for event 3a versus event 2d (the estimated quality of the currently used WCDMA RAN frequency is below a certain threshold + usedFreqThresh2dEcno and the estimated quality of the GSM system is above a certain threshold in the same time interval) for WCDMA RAN, when the 2d measurement quantity is CPICH Ec/No. |
| Range: | Range is valid for CPICH Ec/No. -10 – 10 dB |
| Default: | -1 dB |
| Resolution: | 1 dB |
utranRelThresh3aRscp
[
UTRAN relative threshold 3a (
RSCP)]
| Description: | Relative threshold for event 3a versus event 2d (the estimated power level of the currently used WCDMA RAN frequency is below a certain threshold + usedFreqThresh2dRscp and the estimated power level of the GSM carrier is above a certain threshold in the same time interval) for WCDMA RAN, when the 2d measurement quantity is CPICH RSCP. |
| Range: | Range is valid for CPICH Rscp. -20 — 20 dB |
| Default: | -3 dB |
| Resolution: | 1 dB |
utranRelThreshRscp
[
UTRAN relative threshold (
RSCP)]
| Description: | Relative threshold used together with (on top of) the relative thresholds + utranRelThresh3aRscp (for 3a measurements) and usedFreqRelThresh4_2bRscp (for 2b measurements).
The threshold is used to compute the absolute RSCP threshold for the used frequency for 3a or 2b measurements, when bad connection quality has been triggered in the UL. |
| Range: | Range is valid for CPICH Rscp. 0 dB — 40 dB |
| Default: | 5 dB |
| Resolution: | 1 dB |
utranW3a
[
UTRAN event 3a weighting factor]
| Description: | Weighting factor for event 3a for UTRAN. |
| Range: | 0.0 ... 2.0 |
| Default: | 0.0 |
| Resolution: | 1 |
w1a
[Event 1a weighting factor]
| Description: | Weighting factor for event 1a. |
| Range: | 0.0 ... 2.0 |
| Default: | 0.0 |
| Resolution: | 1 |
w1b
[Event 1b weighting factor]
| Description: | Weighting factor for event 1b. |
| Range: | 0.0 ... 2.0 |
| Default: | 0.0 |
| Resolution: | 1 |
| fddGsmHOSupp | | Indicates if the RNC supports Inter RAT Handover. |
|
| fddIFHOSupp | | Indicates if the RNC supports Inter-Frequency Handover. |
|
| hoType | | Parameter set per Cell. Indicates if Inter RAT Handover or Inter-Frequency HO or None shall be evaluated in case both Inter RAT and Inter-Frequency neighboring cells have been configured. |
|
| defaultHoType | | Parameter set per carrier per DRNC. Indicates handover type for external cells, if Inter RAT Handover or Inter-Frequency HO or None shall be attempted. If not defined then GSM_PREFERRED is used. |
|
| freqBand | | Parameter set per carrier per RNC. Defined together with uarfcnDl (and in DRNC also defaultHoType). |
|
| uarfcnDl | | Channel number set per carrier per RNC. Defined together with freqBand (and in DRNC also defaultHoType). |
|
| releaseConnOffset | | If a cell cannot be added to the active set, and this cell is stronger than the AS + releaseConnOffset, then the call shall be released. |
|
| selectionPriority | | Defines the priority of a neighbor cell, where 1 is the highest prio to be used for the most important neighbors. |
|
| selHoSup | | Indicates if Selective Handover is supported. |
|
| filterCoefficient1 | | Coefficient for layer 3 filtering before intra-frequency reporting evaluation. |
|
| hysteresis1a | | Hysteresis used in addition-window in evaluation criteria for event 1a to avoid ping pong effects. |
|
| hysteresis1b | | Hysteresis used in the drop window in evaluation criteria for event type 1b. |
|
| hysteresis1c | | Hysteresis used in replacement threshold in evaluation criteria for event 1c (A non-active primary CPICH becomes better than an active primary CPICH). |
|
| hysteresis1d | | Hysteresis used in replacement threshold in drop window in evaluation criteria for event 1d (Change of best cell). |
|
| individual offset (serving cell) | | Cell parameter. The offset is added to the measured quantity before the UE evaluates whether an event has occurred. Improper use of non-default values may result in instability and unequal cell borders. |
|
| individual offset (adjacent WCDMA cell) | | Cell parameter. The offset is added to the measured quantity before the UE evaluates whether an event has occurred. Improper use of non-default values may result in instability and unequal cell borders. |
|
| maxActiveSet | | Maximum number of cells allowed in the Active Set. Used in the RNC evaluations of event 1a, 1c, and 1d. If the number of cells in the Active Set is equal to maxActiveSet, the handover evaluation algorithm proposes a cell replacement (event 1c and 1d); otherwise it proposes a cell addition (event 1a). |
|
| measQuantity1 | | Defines the measurement quantity for intra-frequency reporting evaluation. |
|
| reportingInterval1a | | Interval of event-triggered periodical reporting in case of 'cell addition failure' or 'cell replacement failure'. Indicates the interval of periodical reporting triggered by event 1a. |
|
| reportingInterval1c | | Interval of event-triggered periodical reporting in case of 'cell addition failure' or 'cell replacement failure'. Indicates the interval of periodical reporting triggered by event 1c. |
|
| reportingRange1a | | Relative threshold referred to the CPICH of the best cell in the Active Set used as evaluation criteria for event 1a (a primary CPICH enters the reporting range). |
|
| reportingRange1b | | Relative threshold referred to CPICH of the best cell in the Active Set used as evaluation criteria for event 1b (a primary CPICH leaves the reporting range). |
|
| timeToTrigger1a | | Time between detection of event 1a and sending of the measurement report. |
|
| timeToTrigger1b | | Time between detection of event 1b and sending of the measurement report. |
|
| timeToTrigger1c | | Time between detection of event 1c and sending of the measurement report. |
|
| timeToTrigger1d | | Time between detection of event 1d and sending of the measurement report. |
|
| w1a | | Weighting factor for event 1a. |
|
| w1b | | Weighting factor for event 1b. |
|
| filterCoefficient2 | | Coefficient for layer 3 filtering before inter-frequency reporting evaluation. |
|
| filterCoeff6 | | Coefficient for layer 3 filtering before UE internal measurement reporting evaluation. |
|
| hysteresis2d | | Hysteresis used for event 2d (the estimated quality of the currently used UTRAN frequency is below a certain threshold). |
|
| hysteresis2f | | Hysteresis used for event 2f (the estimated quality of the currently used UTRAN frequency is above a certain threshold). |
|
| serviceOffset2dEcno | | Offset per UeRc state that is added to the 2d, 2f, 3a,and 2b Ec/No thresholds. |
|
| serviceOffset2dRscp | | Offset per UeRc state that is added to the 2d, 2f, 3a,and 2b Rscp thresholds. |
|
| timeToTrigger2dEcno | | Interval time between detection of event 2d and sending of the measurement report, when the measurement quantity is CPICH EC/NO. If event 2d condition is fulfilled during at least a time greater than or equal to timeToTrigger2dEcno milliseconds, then event 2d occurs. If the 2d event trigger decision is currently based on RSCP measurements, the parallel Ec/No measurement could be initially disabled by setting timeToTrigger2dEcno to 5000 [ms]. |
|
| timeToTrigger2dRscp | | Interval time between detection of event 2d and sending of the measurement report, when the measurement quantity is CPICH RSCP. If event 2d condition is fulfilled during at least a time greater than or equal to timeToTrigger2dRscp milliseconds, then event 2d occurs. If the 2d event trigger decision is currently based on Ec/No measurements, the parallel RSCP measurement could be initially disabled by setting timeToTrigger2dRscp to 5000 [ms]. |
|
| timeToTrigger2fEcno | | Interval time between detection of event 2f and sending of the measurement report, when the measurement quantity is CPICH EC/NO. If event 2f condition is fulfilled during at least a time greater than or equal to timeToTrigger2fEcno milliseconds, then event 2f occurs. |
|
| timeToTrigger2fRscp | | Interval time between detection of event 2f and sending of the measurement report, when the measurement quantity is CPICH RSCP. If event 2f condition is fulfilled during at least a time greater than or equal to timeToTrigger2fRscp milliseconds, then event 2f occurs. |
|
| timeTrigg6d | | Time between detection of event 6d and sending of the measurement report. |
|
| timeTrigg6b | | Time between detection of event 6b and sending of the measurement report. |
|
| usedFreqThresh2dEcno | | Threshold for event 2d (the estimated quality of the currently used UTRAN frequency is below a certain threshold). Used if measurement quantity is configured to be Ec/No. |
|
| usedFreqThresh2dRscp | | Threshold for event 2d (the estimated power level of the currently used UTRAN frequency is below a certain threshold). Used if measurement quantity is configured to be Rscp. |
|
| usedFreqThresh2dEcnoDrnc | | Defines the threshold for event 2d (the estimated quality of the currently used WCDMA RAN frequency for cells located in DRNC is below a certain threshold). Used if measurement quantity is configured to be Ec/No. |
|
| usedFreqThresh2dRscpDrnc | | Defines the threshold for event 2d (the estimated power level of the currently used WCDMA RAN frequency for cells located in DRNC is below a certain threshold). Used if measurement quantity is configured to be Rscp. |
|
| usedFreqRelThresh2fEcno | | Relative threshold for event 2f (the estimated quality of the currently used UTRAN frequency is above a certain threshold + usedFreqThresh2dEcNo). Used if measurement quantity is configured to be Ec/No. |
|
| usedFreqRelThresh2fRscp | | Relative threshold for event 2f (the estimated power level of the currently used UTRAN frequency is above a certain threshold + usedFreqThresh2dRscp). Used if measurement quantity is configured to be Rscp. |
|
| utranRelThreshRscp | | Relative threshold used together with (on top of) the relative thresholds + utranRelThresh3aRscp (for 3a measurements) and usedFreqRelThresh4_2bRscp (for 2b measurements). The threshold is used to compute the absolute RSCP threshold for the used frequency for 3a or 2b measurements, when bad connection quality has been triggered in the UL. |
|
| usedFreqW2d | | Weighting factor for event 2d for the used frequency. |
|
| usedFreqW2f | | Weighting factor for event 2f for the used frequency. |
|
| txPowerConnQualMonEnabled | | Enables or disables the connection quality monitoring based on UE Tx power. |
|
| ueTxPowerThresh6b | | The threshold used for trigger event 6b when UE TX power becomes less than an absolute threshold. |
|
| filterCoeff4_2b | | Coefficient for layer 3 filtering before inter-frequency reporting evaluation, for measurement 4 event 2b. |
|
| hyst4_2b | | Hysteresis used for event 2b (the estimated quality of the currently used frequency is below a certain threshold and the estimated quality of a non-used frequency is above a certain threshold). |
|
| ifHoAmountPropRepeat | | Maximum number of repeated proposals of non-used frequency cell(s) for handover based on the same measurement report, not including the first attempt. |
|
| ifHoPropRepeatInterval | | Minimum time interval between proposals of the same non-used frequency cell for handover based on the same measurement report. |
|
| maxIefMonSubset | | Maximum number of inter-frequency WCDMA RAN cells that the UE will measure on. |
|
| nonUsedFreqThreshd4_2bEcno | | Defines the threshold for event 2b for the non-used frequency when measurement quantity is Ec/No. The initially check performed for both Ec/No and Rscp quality level of the target cell before an Inter-Frequency Handover is attempt, can also be disabled for the Ec/No measurement quantity, by setting the NonUsedFreqThresh4_2bEcno to its minimum value. |
|
| nonUsedFreqThresh4_2bRscp | | Defines the threshold for event 2b for the non-used frequency when measurement quantity is RSCP. The initially check performed for both Ec/No and RSCP quality level of the target cell before an Inter-Frequency Handover is attempt, can also be disabled for the RSCP measurement quantity, by setting the NonUsedFreqThresh4_2bRscp to its minimum value. |
|
| nonUsedFreqW4_2b | | Weighting factor for event 2b for the non-used frequency. |
|
| timeTrigg4_2b | | Time between detection of event 2b and sending of the measurement report, for measurement 4. |
|
| usedFreqRelThresh4_2bEcno | | Relative threshold for event 2b versus event 2d for the used frequency (the estimated quality of the currently used frequency is below a certain threshold + usedFreqThresh2dEcno and the estimated quality of a non-used frequency is above a certain threshold), when the 2d measurement quantity is Ec/No. |
|
| usedFreqRelThresh4_2bRscp | | Relative threshold for event 2b versus event 2d for the used frequency (the estimated quality of the currently used frequency is below a certain threshold + usedFreqThresh2dRscp and the estimated quality of a non-used frequency is above a certain threshold), when 2d measurement quantity is RSCP. |
|
| usedFreqW4_2b | | Weighting factor for event 2b for the currently used frequency. |
|
| gsmAmountPropRepeat | | Maximum number of repeated proposals (that is, not including the first proposal) of GSM cell(s) for handover based on the same measurement report. |
|
| gsmFilterCoefficient3 | | Coefficient for layer 3 filtering of GSM quality before inter-RAT reporting evaluation. |
|
| gsmPropRepeatInterval | | Minimum time interval between proposals of the same GSM cell for handover based on the same measurement report. |
|
| gsmThresh3a | | Threshold for event 3a (the estimated quality of the currently used UTRAN RAN frequency is below a certain threshold and the estimated quality of the GSM system is above a certain threshold) for GSM. |
|
| hysteresis3a | | Hysteresis used for event 3a. |
|
| individual offset (adjacent GSM cell) | | Cell parameter. The offset is added to the measured quantity before the UE evaluates whether an event has occurred. Improper use of non-default values may result in instability and unequal cell borders. |
|
| maxGsmMonSubset | | Maximum number of GSM cells that the UE will measure on. |
|
| timeToTrigger3a | | Time between detection of event 3a and sending of the measurement report. |
|
| utranFilterCoefficient3 | | Coefficient for layer 3 filtering of UTRAN quality before inter-RAT reporting evaluation. |
|
| utranRelThresh3aEcno | | Relative threshold for event 3a versus event 2d (the estimated quality of the currently used WCDMA RAN frequency is below a certain threshold + usedFreqThresh2dEcno and the estimated quality of the GSM system is above a certain threshold in the same time interval) for WCDMA RAN, when the 2d measurement quantity is CPICH Ec/No. |
|
| utranRelThresh3aRscp | | Relative threshold for event 3a versus event 2d (the estimated power level of the currently used WCDMA RAN frequency is below a certain threshold + usedFreqThresh2dRscp and the estimated power level of the GSM carrier is above a certain threshold in the same time interval) for WCDMA RAN, when the 2d measurement quantity is CPICH RSCP. |
|
| utranW3a | | Weighting factor for event 3a for UTRAN. |
|
| cnhhoSupp | | Indicates whether the CNHHO is activated in the RNC. It applies for both Source and Target RNC. |
|
| intraFreqCnhhoPenalty | | Defines the 'penalty' given to a 'Non-Iur External UTRAN' cell compared to a normal intra-frequency cell for the event 1a, 1c and 1d. |
|
| intraFreqCnhhoWeight | | Scale number that defines the weight of the radio links in the active set, when comparing them to an intra-frequency CNHHO candidate. intraFreqCnhhoWeight=0 means that only the best cell in AS is considered, intraFreqCnhhoWeight>0 means that all radio links in the active set are considered, while intraFreqCnhhoWeight=1 means that all radio links in the active set are given equal importance. |
|
| interFreqCnhhoPenaltyEcno | | Defines how much penalty is given to a 'Non-Iur External UTRAN' cell compared to a normal inter-frequency cell during Ec/No evaluation. |
|
| interFreqCnhhoPenaltyRscp | | Defines how much penalty is given to a 'Non-Iur External UTRAN' cell compared to a normal inter-frequency cell during RSCP evaluation. |
|
| cellCapability | | Indicates if an External DRNC cell supports HSDPA or EUL/HSDPA, or also EUL 2 ms TTI. |
|
| cellCapabilityControl | | Indicates if a DRNC supports HSDPA or EUL/HSDPA, or also EUL 2 ms TTI. |
|
| event1dRncOffset | | Specifies how much stronger than the serving cell a 1a/1c event report from a non-EUL cell must be to trigger a reconfiguration away from EUL. |
|
| event1dRncThreshold | | Specifies how many 1a/1c event reports from the same non-EUL cell that is needed to trigger a reconfiguration away from EUL. |
|
| hsCellChangeAllowed | | Turns serving HS-DSCH Cell Change on or off. |
|
| hsHysteresis1d | | Sets the event 1d HS hysteresis value specific for HS-DSCH connections. |
|
| hsQualityEstimate | | Indicates whether it is CPICH Ec/No or CPICH RSCP that should be used for indicating "best cell" for HS-DSCH Cell Change. |
|
| hsTimeToTrigger1d | | Sets the event 1d HS Time to Trigger value specific for HS-DSCH connections. |
|
| hsToDchTrigger | | Multi valued parameter that defines which switches from HS-DSCH to DCH that are allowed. The different cases can be set independently of each other. |
|
| | | poorQualityDetected: Applies to the case when triggered by bad connection quality |
|
| | | changeOfbestCellIntraRnc: Applies to the case when triggered by change of best cell, when the new best cell is an intra-RNC cell. |
|
| | | servHsChangeIntraRnc: Applies to the case when the serving cell is removed from the active set and the best cell is an intra-RNC cell. |
|
| | | servHsChangeInterRnc:Applies to the case when the serving cell is removed from the active set and the best cell is an inter-RNC external cell |
|
| | | changeOfBestCellInterRnc:Applies to the case when triggered by change of best cell, when the new best cell is an inter-RNC external cell. |
|
Table 7 shows parameters mentioned in this document. Default value, value range, resolution and unit are shown for each parameter. To facilitate reading, translation to a more convenient unit has been made wherever necessary. The translated properties are within brackets. For the latest recommended radio network parameter settings see
Radio Network Parameters (86/1553–HSD 101 02/7).
Table 7 WCDMA RAN Handover Parameters
| Parameter Name | Default Value | Value Range | Resolution | Unit |
| General |
| fddGsmHOSupp | FALSE | FALSE; TRUE | - | - |
| fddIfhoSupp | FALSE | FALSE; TRUE | - | - |
| hoType | GSM_PREFERRED | IFHO_PREFERRED; GSM_PREFERRED; NONE | - | - |
| defaultHoType | GSM_PREFERRED | IFHO_PREFERRED; GSM_PREFERRED; NONE | - | - |
| freqBand | 0 | 0..22 | - | - |
| uarfcnDl | N/A | 0..16383 | - | - |
| releaseConnOffset | 120 | -30..250 | 5 | 0.1 dB |
| [12] | [-3..25] | [0.5] | [dB] |
| selectionPriority | 0 | 0..Large Integer | 1 | - |
| selHoSup | FALSE | FALSE; TRUE | - | - |
| Intra Frequency Handover |
| filterCoefficient1 | 2 | 0...9, 11, 13, 15, 17, 19 | 1 | - |
| hysteresis1a | 0 | 0..15 | 1 | 0.5 dB |
| [0] | [0..7.5] | [0.5] | [dB] |
| hysteresis1b | 0 | 0..15 | 1 | 0.5 dB |
| [0] | [0..7.5] | [0.5] | [dB] |
| hysteresis1c | 2 | 0..15 | 1 | 0.5 dB |
| [1] | [0..7.5] | [0.5] | [dB] |
| hysteresis1d | 15 | 0..15 | 1 | 0.5 dB |
| [7.5] | [0..7.5] | [0.5] | [dB] |
| individualOffset (serving cell) | 0 | -100..100 | 5 | 0.1 dB |
| [0] | [-10.0..10.0] | [0.5] | [dB] |
| individualOffset (adjacent WCDMA cell) | 0 | -100..100 | 5 | 0.1 dB |
| [0] | [-10.0..10.0] | [0.5] | [dB] |
| maxActiveSet | 3 | 2..4 | 1 | # cells |
| measQuantity1 | CPICH_EC_NO | CPICH_EC_NO; CPICH_RSCP | - | - |
| reportingInterval1a | 3 | 0..7 | 1 | - |
| [1] | [No reporting; 0.25; 0.5; 1; 2; 4; 8; 16] | [-] | [s] |
| reportingInterval1c | 3 | 0..7 | 1 | - |
| [1] | [No reporting; 0.25; 0.5; 1; 2; 4; 8; 16] | [-] | [s] |
| reportingRange1a | 6 | 0..29 | 1 | 0.5 dB |
| [3] | [0..14.5] | [0.5] | [dB] |
| reportingRange1b | 10 | 0..29 | 1 | 0.5 dB |
| [5] | [0..14.5] | [0.5] | [dB] |
| timeToTrigger1a | 11 | 0..15 | 1 | - |
| [320] | [0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000] | [-] | [ms] |
| timeToTrigger1b | 12 | 0..15 | 1 | - |
| [640] | [0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000] | [-] | [ms] |
| timeToTrigger1c | 11 | 0..15 | 1 | - |
| [320] | [0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000] | [-] | [ms] |
| timeToTrigger1d | 14 | 0..15 | 1 | - |
| [2560] | [0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000] | [-] | [ms] |
| w1a | 0.0 | 0.0...2.0 | 1 | 0.1 |
| w1b | 0.0 | 0.0...2.0 | 1 | 0.1 |
| Inter-Frequency Handover & IRAT Handover |
| filterCoefficient2 | 2 | 0...9, 11, 13, 15, 17, 19 | 1 | - |
| filterCoeff6 | 19 | 0...9, 11, 13, 15, 17, 19 | 1 | - |
| hysteresis2d | 0 | 0..29 | 1 | 0.5 dB |
| [0] | [0..14.5] | [0.5] | [dB] |
| hysteresis2f | 0 | 0..29 | 1 | 0.5 dB |
| [0] | [0..14.5] | [0.5] | [dB] |
| serviceOffset2dEcno | 0 | -20..20 | 1 | [dB] |
| serviceOffset2dRscp | 0 | -50..50 | 1 | [dBm] |
| timeToTrigger2dEcno | 320 | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 | - | ms |
| timeToTrigger2dRscp | 320 | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 | - | ms |
| timeToTrigger2fEcno | 1280 | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 | - | ms |
| timeToTrigger2fRscp | 1280 | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 | - | ms |
| timeTrigg6d | 320 | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 | - | ms |
| timeTrigg6b | 1280 | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 | - | ms |
| usedFreqThresh2dEcno | -12 | -24..0 | 1 | dB |
| usedFreqThresh2dRscp | -97 | -115..-25 | 1 | dBm |
| usedFreqThresh2dEcnoDrnc | -12 | -24..0 | 1 | dB |
| usedFreqThresh2dRscpDrnc | -97 | -115..-25 | 1 | dBm |
| usedFreqRelThresh2fEcno | 1 | 0..20 | 1 | dB |
| usedFreqRelThresh2fRscp | 3 | 0..20 | 1 | dB |
| usedFreqW2d | 0.0 | 0.0...2.0 | 1 | 0.1 |
| usedFreqW2f | 0.0 | 0.0...2.0 | 1 | 0.1 |
| utranRelThreshRscp | 5 | 0 ..40 | 1 | dB |
| txPowerConnQualMonEnabled | TRUE | FALSE; TRUE | 1 | - |
| ueTxPowerThresh6b | +18 | -50..+33 | 1 | dBm |
| Inter-Frequency Handover Only |
| filterCoeff4_2b | 2 | 0...9, 11, 13, 15, 17, 19 | 1 | - |
| hyst4_2b | 10 | 0..75 | 1 | 0.1 dB |
| [1] | [0..7.5] | [0.1] | [dB] |
| ifHoAmountPropRepeat | 4 | 0..25 | 1 | attempt |
| ifHoPropRepeatInterval | 5 | 0..25 | 1 | 0.2 s |
| [1] | [0..5.0] | [0.2] | [s] |
| maxIefMonSubset | 32 | 1..32 | 1 | cell |
| nonUsedFreqThresh4_2bEcno | -13 | -24..0 | 1 | dB |
| nonUsedFreqThresh4_2bRscp | -105 | -115..25 | 1 | dBm |
| nonUsedFreqW4_2b | 0.0 | 0.0...2.0 | 1 | 0.1 |
| timeTrigg4_2b | 100 | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 | - | ms |
| usedFreqRelThresh4_2bEcno | -1 | -10..10 | 1 | dB |
| usedFreqRelThresh4_2bRscp | -3 | -20..20 | 1 | dB |
| usedFreqW4_2b | 0.0 | 0.0...2.0 | 1 | 0.1 |
| Inter Radio Access Technology Handover |
| gsmAmountPropRepeat | 4 | 0..25 | 1 | attempt |
| gsmFilterCoefficient3 | 1 | 0...9, 11, 13, 15, 17, 19 | 1 | - |
| gsmPropRepeatInterval | 5 | 0..25 | 1 | 0.2 s |
| [1] | [0..5.0] | [0.2] | [s] |
| gsmThresh3a | -102 | -115..0 | 1 | dBm |
| hysteresis3a | 0 | 0..15 | 1 | 0.5 dB |
| [0] | [0..7.5] | [0.5] | [dB] |
| individualOffset (adjacent GSM cell) | 0 | -50..50 | 5 | 0.1 dB |
| [0] | [-5.0..5.0] | [0.5] | [dB] |
| maxGsmMonSubset | 32 | 1..32 | 1 | cell |
| timeToTrigger3a | 6 | 0..15 | 1 | - |
| [100] | [0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000] | [-] | [ms] |
| utranFilterCoefficient3 | 2 | 0...9, 11, 13, 15, 17, 19 | 1 | - |
| utranRelThresh3aEcno | -1 | -10..10 | 1 | dB |
| utranRelThresh3aRscp | -3 | -20..20 | 1 | dB |
| utranW3a | 0.0 | 0.0...2.0 | 1 | 0.1 |
| Core Network Hard Handover |
| cnhhoSupp | FALSE | FALSE; TRUE | - | - |
| intraFreqCnhhoPenalty | 30 | 0..250 | 5 | 0.1 dB |
| [3] | [0..25.0] | [0.5] | [dB] |
| intraFreqCnhhoWeight | 0 | 0..10 | 1 | - |
| [0] | [0..1] | [0.1] | [-] |
| interFreqCnhhoPenaltyEcno | 30 | 0..250 | 5 | 0.1 dB |
| [3] | [0..25.0] | [0.5] | [dB] |
| interFreqCnhhoPenaltyRscp | 30 | 0..250 | 5 | 0.1 dB |
| [3] | [0..25.0] | [0.5] | [dB] |
| HSDPA and EUL Mobility |
| cellCapability | hsdschSupport : Off
edchSupport: Off
edchTti2Support: Off | hsdschSupport : On ; Off
edchSupport: On ; Off
edchTti2Support: On ; Off | | |
| cellCapabilityControl | hsdschSupport : Off
edchSupport: Off
edchTti2Support: Off | hsdschSupport : On ; Off
edchSupport: On ; Off
edchTti2Support On ; Off | | |
| event1dRncOffset | 0 | -25..25 | 1 | dB |
| event1dRncThreshold | 4 | 0..60 | 1 | - |
| hsCellChangeAllowed | FALSE | FALSE; TRUE | - | - |
| hsHysteresis1d | 10 | 0..75 | 1 | 0.1 dB |
| [1] | [0..7.5] | [0.1] | [dB] |
| hsQualityEstimate | CPICH_ RSCP | CPICH_EC_NO; CPICH_RSCP | - | - |
| hsTimeToTrigger1d | 640 | 0; 10; 20; 40; 60; 80; 100; 120; 160; 200; 240; 320; 640; 1280; 2560; 5000 | - | ms |
hsToDchTrigger
- poorQualityDetected
- changeOfBestCellIntraRnc
- changeOfBestCellInterRnc
- servHsChangeIntraRnc
- servHsChangeInterRnc | OFF for all transitions | ON=1,OFF=0 | - | — |
Constants are hard-coded values and therefore cannot be changed by the operator. The values stated below could be changed by Ericsson without notice.
C_gsmHoAllowed
| Description: | Indicates per UeRc state if Inter-RAT HO is allowed |
| Value: | 0= Not allowed, 1= Allowed |
C_ifHoAllowed
| Description: | Indicates per UeRc state if Inter-Frequency HO is allowed |
| Value: | 0= Not allowed, 1= Allowed |
C_MaxBufferTime
| Description: | Maximum time in buffer for a buffered report |
| Value: | 2 seconds |
C_MaxSohoListSubset
| Description: | Maximum number of intra-frequency WCDMA RAN cells that the UE will measure on |
| Value: | 32 |
C_utranThresh3aForcedGsm
| Description: | UTRAN threshold for event 3a for Service Based GSM Handover measurements using measurement quantity CPICH Ec/No |
| Value: | 0 |
The following supervision timers are used by handover algorithms and functions. The values are hard coded and cannot be changed. The values stated below could be changed by Ericsson without notice.
T-ASU
| Description: | Timer used to supervise the RRC Active Set Update procedure.
Started at transmission of Active Set UPDATE message.
Stopped at reception of Active Set UPDATE COMPLETE message or Active Set UPDATE FAILURE message |
| Value: | 5 seconds |
T_RELOC_prep
| Description: | Timer for supervising the time to resource allocation in the target GSM system.
Started at transmission of RELOCATION REQUIRED message.
Stopped at reception of RELOCATION COMMAND or IU RELEASE REQUEST message.
Action at expiration: Cancel the function and send RELOCATION
CANCEL message to CS CN. |
| Value: | 10 seconds |
IRAT HO can be activated or disabled with
FddGsmHoSupp. If this parameter is set to FALSE, then all
IRAT HO functionality will be blocked.
IF
HO can be activated or disabled with
FddIfHoSupp. If this parameter is set to FALSE, then all IF
HO functionality will be blocked.
Several aspects of
HSDPA mobility are parameter controlled, and the functionality is also controlled by Licensing.
Serving
HSDPA Cell Change can be turned On/Off with the parameter
hsCellChangeAllowed.
Reconfigurations to
DCH from
HSDPA can be turned On/Off separately for different trigger cases with the parameter
hsToDchTrigger.
Selection and reconfiguration to a coverage related cell can be turned On/Off with the parameter
hsOnlyBestCell.
Iur Support can be configured per Iur link by setting
cellCapabilityControl,
hsdschSupport = On
The License Key for
HSDPA Mobility phase 1 covers the functionality for Serving
HSDPA Cell Change and for Selecting a coverage related cell at
RAB establishment.
The License Key for
HSDPA Mobility phase 2 covers the functionality for Reconfiguration to
DCH and for Selecting a coverage related cell when triggered by activity. Note that the phase 1 Licensing Key is also a prerequisite for phase 2.
The Licence Key for IF/IRAT Mobility on HSDPA/EUL covers the ability to perform compressed mode and
HO measurements while using
HSDPA and 10
ms TTI EUL.
Enhanced
UL is an optional feature, but
EUL mobility part is basic when
EUL is supported, so there is no explicit licence for
EUL mobility.
Iur Support can be configured per Iur link by setting
cellCapabilityControl,
hsdschSupport = On,
edchSupport/
edchTti2Support= On.
EUL mobility requires the corresponding
HSDPA mobility licencies.
Service Based
HO to
GSM is activated with the corresponding Licence Key.
Core Network
HHO can be activated or disabled by setting the parameter
cnhhSupp to TRUE or FALSE.
Acronyms and terms used in this description are listed in the Glossary of Terms and Acronyms.
