6 Handover Parameters 162q45
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Major HO Parameters Configuration [Handover Control Table] -1 Parameter name Co-BSC/MSC Adj.
Penalty allowed
Load HO allowed
MS Fast moving HO allowed
Meaning th
th
It means whether the 12 and 13 bits acts in the 16bit order. “Yes” means handover in the same BSC/MSC is preferred. th th “No” means that the 12 and 13 bits are shielded and set to “0”. It determines whether to punish the target cell of handover failure, or the original served cell of handover upon too big TA or bad quality. The penalty measures can apply to cells in or out of the same BSC. It determines whether to perform the handover to share traffic load. Load sharing can lower the channel assignment failure ratio caused by cell congestion, so as to make evener allocation of the service in respective cells, and lower the cell congestion rate , and improve network performance. It on ly applies in the same BSC or cells at the same level. It determines whether to handle the fast moving MS with the algorithm. It is only recommended in special a reas (such as a highway), to lower U load. This algorithm should only be used in suitable conditions, and usually it is not applied.
Value range Yes, No
Recommen ded value Yes
Yes, No
No
Yes, No
No
Yes, No
No
Major HO Parameters Configuration [Handover Control Table] -2 Parameter name
Meaning
Value range
Recommended value No
RX_Level_Drop HO allowed
It means whether RX_Level_Drop emergency Yes, No handover algorithm is allowed, handover the MS which receiving signal level is dropping quickly in advance to avoid potential call drop. This algorithm should be applied in suitable conditions, and usually it is not used. To apply the handover algorithm, BSC must have original measurement report.
PBGT HO allowed
It means whether PBGT handover algorithm is Yes, No allowed. PBGT handover algorithm currently is processed on LAPD board. To avoid Ping -pang handover, PBGT handover is only performed between cells at the same layer and with the same priority, and meanwhile it is only triggered on TCH.
Yes
MS power prediction after HO
It means after a handover whether MS is to use proper predicted transmitting power to access the new channel. This can reduce system interference and improve service qualit y (this parameter acts when intra BSC handover occurs).
Yes
Yes, No
Major HO Parameters Configuration [Handover control table] -3 Parameter name MR. Preprocessing
Meaning
Value range
“Yes” means perform measureme nt report Yes, No preprocessing on BTS; “No” means preprocessing on BSC, then the two parameters of “Send original measurement report” and “Send BS/MS power level” do not act. “Yes” means decreasing of Abis interface signaling and BSC load, and improving of network response time performance. The switch determines where to perform power control. When it is set to “Yes”, power control is performed at BTS side. When it is set to “No”, power control is performed at BSC side. When setting this parameter, first be clear whether BTS s the power control algorithm to set or not.
Recommended value Yes
Major HO Parameters Configuration [Cell Description Table] -1 Parameter name Layer of the cell
Value range Huwei hierarchical network structure is divided into 4 layers. 16 The priorities can be set for each layer, which provides enough room 1st~4th of network planning for the operator to adapt to various complex layers network environment. Normally, Macro layer is the major 900 layer, Micro layer is the major 1800 layer, Pico is the 900 and 1800 micro cell layer. The smaller layer value, the higher priority. Each layer may have 16 priorities, used to control the handover 1~16 priority between cells at the same layer. Usually priorities of priorities cells at the same layer are set the same. For cells at the same layer, the smaller the priority value, the higher the priority.
Recommended value M900: the 3 rd layer， M1800: the 2 nd layer
Layer HO Thrsh.
It affects the value of the 14th bit in the 16bit ranking, and it is 0~63 also the level requirement on the target cell for int erference handover, layer handover and load handover. Then su ch level should be higher than layer h andover threshold + layer handover hysteresis. The layer handover threshold should be set >= Edge handover threshold + Inter -cell handover hysteresis.
25
Layer HO hysteresis
Works together with the Layer handover threshold.
3
Cell priority
Meaning
0~63dB
1
Major HO Parameters Configuration [Cell Description Table] -2 Parameter Meaning Value range name Penalty on It is valid when the fast m oving handover algorithm is 0~63dB MS Fasting enabled. It is the signal level penalty value on the other moving HO neighbor cells when MS moves fast and is handed over to umbrella cell. The paramete r is only valid within the penalty time.
Recommended value 30
Penalty Time on MS Fasting moving HO Min DL level 0n candidate cell
It means that within this tim e, the penalty on the other 0~255 neighbor cells will be exerted a fter MS is handed over seconds to umbrella cell by fast moving HO.
40
This is the min signal level requirement for the cell itself 0~63 to be a candidate cell. Too low configuration may easily cause call drops, while too high a configuration might turn handover too hard to occur.
15
Major HO Parameters Configuration [Adjacent Cell Relation Table] -1 Parameter name Ncell ID
Min access level offset
Meaning
Value range
Neighbor cell ID index.
0~255 for internal cell; 0~799 for external cell
This offset is based on “Min downlink level of handover candidate cell”. Different offsets can be defined for different adjacent cells, and to enter the can didate cell list, the corresponding adjacent cell rec eiving signal level must be higher tha n the sum of “Mi n downlink level of handover candidate cell” and “ Min. Access level offset”.
0~63
Recommended value
0
Major HO Parameters Configuration [Adjacent Cell Relation Table] -2 Parameter Meaning Value range name PBGT HO It means that PBGT handover is performed when the 0~127,corresp Thrsh. difference between the target cell downlink path loss and the onding to serving cell downlink path loss is bigger than PBGT handover --64~63dB threshold. Whe n PBGT handover is enabled , and “Inter -cell handover hysteresis” > “PBGT handover threshold (corresponding dB value)”, “Inter -cell handover hysteresis” takes place of “PBGT handover threshold” to act. . PBGT handover threshold also needs to be adjusted acc ording to handover performance statistics result.
Recommended value It is around 68 in the densely populated downtown, and around 72 on the outskirts.
Inter-cell HO Handover hysteresis between an adjacent cell and the serving 0~63db hysteresis cell. It is set to reduce “Ping -pang” HO. The hysteresis value also needs to be adjusted according to the handover performance statistics result and live network. Flexible configuration of the value can effectively lead handover and traffic between two adjacent cells.
It is around 4 in the densely populated downtown, and around 8 on the outskirts.
Major HO Parameters Configuration [Penalty Table] -1 Parameter name Penalty level after HO fail
Meaning
Value range
The signal level value in dB, to punish the target cell which has caused a HO failure due to problems such as congestion , to prevent MS from a handover re-attempt to that ce ll again. This value is only valid within the penalty time for handover failure.
0~63dB
Recommended value 30
Penalty time after HO fail Penalty level after BQ HO fail
Penalty time on the corresponding target cell after handover failure The signal level pen alty value for the original serving cell, to avoid “Ping -pang” handover after emergency handover upon bad quality. It is only valid within the penalty time for BQ HO.
0~60 seconds
10
0~63dB
63
Penalty time after BQ HO fail
Penalty time for the original serving cell after BQ HO.
0~60 seconds
10
Major HO Parameters Configuration [Penalty Table] -2
Parameter Meaning Value range name Penalty The signal strength penalty value for the original serving cell, 0~63dB level after to avoid “Ping -pang” handover after TA emergency TA HO fail handover. It is only valid within the penalty time for ta handover.
Recommended value 63
Penalty time after TA HO fail Penalty time after IUO HO fail
0~60Seconds
10
After an overlaid/underlaid handover failure (big circle hands 0~16Seconds over to small circle o r vice versa), within certain time (this parameter configuration value) overlaid/und erlaid handover is forbidden for the same call.
10
Penalty time for the original serving cell after TA emergency handover.
Major HO Parameters Configuration [Emergency Handover Table] -1 Parameter name
Meaning
Value range
Recommended value
TA Thrsh.
When TA≥this value, emergency handover is triggered
0~63 bit period
63
DL QUAL. Thrsh
The downlink receiving quality threshold for BQ emergency handover. When frequency hopping or DTX is enabled, RQ becomes worse (normal phenomenon), this value should be set to 70. The adjustment should also base on the current network quality and handover statistics. When triggering emergency handover, the first to select is the intercell handover, the intra-cell handover is only triggered when there is no candidate cell and the intra-cell handover is allowed in the serving cell.
0~70, correspondin g to BQ levels of 0~7
60
UL QUAL. Thrsh.
The uplink receiving quality threshold for BQ emergency HO.
correspondin g to BQ levels of 0~7
60
Major HO Parameters Configuration [Emergency Handover Table] -2 Parameter name UL Qual.Thrsh. for interf. HO
Meaning
Value range
Recommended value Uplink receiving quality threshold in the serving cell for corresponding 50, interference interference handover. When frequency hopping or DTX is to BQ levels of quality threshold enbaled, RQ becomes worse (normal phenomenon), this 0~7 must be better than value should be set to 60. The adjustment should also base the emergency on the current network quality and handover statistics. When quality threshold triggering interference handover. If the serving cell is in the first position and intra-cell handover is permitted, perform intra-cell handover. Otherwise select the second candidate cell to perform inter-cell handover.
DL Qual. Thrsh. For interf HO.
Downlink receiving quality threshold in the serving cell for interference handover.
0~70, 50 corresponding to BQ levels of 0~7
Major HO Parameters Configuration [Emergency Handover Table] -3 Paramete r name UL RX_LEV Thrsh. for interf.HO
DL RX_LEV Thrsh. for interf HO.
Meaning
Value range
Min uplink receiving power threshold from the serving cell 0~63 required for interf. HO, when interference handover is triggered if the uplink quality is worse than quality thr eshold and at this time the uplink signal level is higher than the signal threshold. When triggering interference handover, If the serving cell is in the first posi tion in the cell list, and intra-cell handover permitted, then start intra -cell HO. Otherwis e select the second cell to perform inter-cell HO. Min downlink receiving power threshold from the serving cell 0~63 required for interf. HO.
Recommended value 25
30
Major HO Parameters Configuration [Load Handover Table] -1 Parameter name System flux Thrsh. for load HO
Load HO Thrsh
Meaning The pre-condition for load HO is that the system flow (signaling flow) is lower the threshold. This value can not be set too high because load handover upon max threshold may cause serious effect to the system. Load handover is triggered when the serving cell load is higher than the threshold, TCH seized in the cell has reaching the corresponding percentage.
Load Req. on The Load threshold for the ta rget cells that can accept MS from candidate cell serving cell in load HO, i.e. when the TCH under Idle mode in the neigh bor cell is lower than the corresponding percentage , the cell refuses to accept MS from serving cell handed over due to the load reason.
Value range
Recommended value 10
0, 8~11 system flow levels, corresponding to 0, 70, 80, 90 and 95. 0~7 cell load 5 levels, corresponding to 0, 50, 60, 70, 75, 80, 85, 90 0~7, 2 corresponding to 0, 50, 60, 70, 75, 80, 85, 90
Major HO Parameters Configuration [Normal Handover Table] -1 Parameter Meaning name Edge HO UL During the statistics time, if the time in which the uplink receiving level is lower than the value is longer than RX_LEV certain time called continuous time, edge handover Thrsh. will be performed. If PBGT handover is enabled, Corresponding edge handover threshold will be set lower.
Edge HO DL Downlink consideration for edge HO. RX_LEV Thrsh.
Value range
Recommended value
0~63
25 (without PBGT handover, downtown), 15 (single station on outskirts), 15 (with PBGT handover, downtown)
63
30 (without PBGT handover, downtown), 20 (single station on outskirts), 20 (with PBGT handover, downtown)
Major HO Parameters Configuration [Normal Handover Table] -2 Parameter name Edge HO watch time
Edge time
Meaning
It means that within the time statistics, if the time in which the signal level is lower than threshold is higher than the continuous time, then margin HO is to be triggered. valid See the above.
Value range
Recommended value
1~16 seconds
5
1~16 seconds
4
Major HO Parameters Configuration [Normal Handover Table] -3 Parameter Meaning name PBGT watch Statistics time for PBGT HO signal level judgment. time
PBGT time
valid Continuous time for PBGT HO signal level judgment.
Value range
Recommended value
1~16 seconds
5
1~16 seconds
4
Major HO Parameters Configuration [Normal Handover Table] -4 Parameter name Layer HO watch time Layer HO valid time
Meaning
Value range
Recommended value
Statistics time for Layer HO judgment
1~16 seconds
5
Continuous time for Layer HO judgment.
1~16 seconds
4
Major HO Parameters Configuration [Fast-Moving Handover Table] Parameter name MS Fast-moving watch cells MS Fast-moving valid cells
MS Fast-moving time Thrsh.
Meaning The cell sum P for judge whether MS is fast moving. The value, if too large, may cause abrupt increase of system flow, while too small value may cause inaccurate judgment for fast moving MS.
Value range 1~10
The cell sum N by which MS actually quickly es. If 1~10 within P cells that MS continuously past, the number of cells by which the MS is judged to quickly is equal to or more than N, then the MS will b e judged as a fast moving MS. The time threshold (2r/v) determined by the cell radius 0~255 (r) and moving speed (v). If the time in which MS seconds es the cell is smaller than the threshold, then MS is judged to quickly the cell.
Recommended value 3
2
15
Major HO Parameters Configuration [Concentric Cell Handover Table] -1 Parameter name UO signal intensity difference
Meaning
Value range
BTS transmitting Power difference between 0~63db underlaid and overlaid may cause MS receiving signal intensity difference in underlaid and overlaid . The parameter uaually indicates the antenna EIRP difference in dB between underlaid cell and overlaid cell. According to field measurement, multi-point measurement is necessary if the underlaid and overlaid use different antenna.
Recommended value Set according to actual conditions
Major HO Parameters Configuration [Concentric Cell Handover Table] -2 Parameter name
Meaning
Value range
Recommended value
RX_LEV Thrsh
Rx level hysteresis, TA threshold and TA hysteresis tly define underlaid area and overlaid area. It must be bigger than edge handover threshold, and the recommended value is: edge handover threshold + signal intensity difference between underlaid and overlaid .
0~63
25
RX_LEV hysteresis
Works with Rx threshold.
0~63
5
TA Thrsh.
It must be bigger than TA emergency handover threshold.
0~63 bit period, with 1 bit period corresponding to 0.55km
TA hysteresis
Works with TA threshold.
0~63 bit period
Major HO Parameters Configuration
[Concentric Cell Handover Table] -3 Parameter name
Meaning
UO HO watch time P/N judgment statistics time for U/O HO judgment.
UO HO valid time
P/N judgment continuous time for U/O HO judgment.
Value range 0~16 seconds
Recommended value 5
0~16 seconds
4
Major HO Parameters Configuration [Concentric Cell Handover Table] -4 Parameter name
Meaning
Value range
Assign optimum layer
In Overlaid/Underlaid, the following selection are available for TCH assignment: (1) The system judges according to the measurement report on SDCCH and assign to the best sub-cell. (2) Select the overlaid first for TCH assignment. (3) Select the underlaid first for TCH assignment. (4) Do not give extra priority.
System optimization, overlaid , underlaid , no preferential
Assignoptimum level Thrsh.
If system optimization is selected, estimate (interpolate, filter) current SDCCH level value through uplink measurement value in the former SDCCH measurement report, and compare with “ Assign-optimum Level threshold”, so as to assign overlaid or underlaid channel. If SDCCH is in the overlaid : edge handover threshold + signal intensity difference between underlaid and overlaid + uplink and downlink balance allowance + SDCCH and TCH difference allowance. If SDCCH is in the underlaid : edge handover threshold + uplink and downlink balance allowance + SDCCH and TCH difference allowance.
0~63
Recommended value System optimization
Major HO Parameters Configuration
[Concentric Cell Handover Table] -5 Parameter name
Meaning
Value range
Recommended value
Pref. subcell in HO of intra-BSC
When the cell is configured into a Overlaid/Underlaid, there are two processing methods for incoming handover request in BSC: (1) No special processing for channel assignment. (2) Add BCCH signal level value of the target cell in intercell handover request message to BSC to make BSC allocate optimum channel for MS from underlaid or overlaid .
Yes, No
Yes
Incoming-toBSC HO optimum layer
If there is a incoming BSC HO, and the target cell is a Overlaid/Underlaid, then, this parameter will show which layer is preferred to provide service for the MS.
overlaid , underlaid , none
None
Penalty allowed
Load HO allowed
MS Fast moving HO allowed
Meaning th
th
It means whether the 12 and 13 bits acts in the 16bit order. “Yes” means handover in the same BSC/MSC is preferred. th th “No” means that the 12 and 13 bits are shielded and set to “0”. It determines whether to punish the target cell of handover failure, or the original served cell of handover upon too big TA or bad quality. The penalty measures can apply to cells in or out of the same BSC. It determines whether to perform the handover to share traffic load. Load sharing can lower the channel assignment failure ratio caused by cell congestion, so as to make evener allocation of the service in respective cells, and lower the cell congestion rate , and improve network performance. It on ly applies in the same BSC or cells at the same level. It determines whether to handle the fast moving MS with the algorithm. It is only recommended in special a reas (such as a highway), to lower U load. This algorithm should only be used in suitable conditions, and usually it is not applied.
Value range Yes, No
Recommen ded value Yes
Yes, No
No
Yes, No
No
Yes, No
No
Major HO Parameters Configuration [Handover Control Table] -2 Parameter name
Meaning
Value range
Recommended value No
RX_Level_Drop HO allowed
It means whether RX_Level_Drop emergency Yes, No handover algorithm is allowed, handover the MS which receiving signal level is dropping quickly in advance to avoid potential call drop. This algorithm should be applied in suitable conditions, and usually it is not used. To apply the handover algorithm, BSC must have original measurement report.
PBGT HO allowed
It means whether PBGT handover algorithm is Yes, No allowed. PBGT handover algorithm currently is processed on LAPD board. To avoid Ping -pang handover, PBGT handover is only performed between cells at the same layer and with the same priority, and meanwhile it is only triggered on TCH.
Yes
MS power prediction after HO
It means after a handover whether MS is to use proper predicted transmitting power to access the new channel. This can reduce system interference and improve service qualit y (this parameter acts when intra BSC handover occurs).
Yes
Yes, No
Major HO Parameters Configuration [Handover control table] -3 Parameter name MR. Preprocessing
Meaning
Value range
“Yes” means perform measureme nt report Yes, No preprocessing on BTS; “No” means preprocessing on BSC, then the two parameters of “Send original measurement report” and “Send BS/MS power level” do not act. “Yes” means decreasing of Abis interface signaling and BSC load, and improving of network response time performance. The switch determines where to perform power control. When it is set to “Yes”, power control is performed at BTS side. When it is set to “No”, power control is performed at BSC side. When setting this parameter, first be clear whether BTS s the power control algorithm to set or not.
Recommended value Yes
Major HO Parameters Configuration [Cell Description Table] -1 Parameter name Layer of the cell
Value range Huwei hierarchical network structure is divided into 4 layers. 16 The priorities can be set for each layer, which provides enough room 1st~4th of network planning for the operator to adapt to various complex layers network environment. Normally, Macro layer is the major 900 layer, Micro layer is the major 1800 layer, Pico is the 900 and 1800 micro cell layer. The smaller layer value, the higher priority. Each layer may have 16 priorities, used to control the handover 1~16 priority between cells at the same layer. Usually priorities of priorities cells at the same layer are set the same. For cells at the same layer, the smaller the priority value, the higher the priority.
Recommended value M900: the 3 rd layer， M1800: the 2 nd layer
Layer HO Thrsh.
It affects the value of the 14th bit in the 16bit ranking, and it is 0~63 also the level requirement on the target cell for int erference handover, layer handover and load handover. Then su ch level should be higher than layer h andover threshold + layer handover hysteresis. The layer handover threshold should be set >= Edge handover threshold + Inter -cell handover hysteresis.
25
Layer HO hysteresis
Works together with the Layer handover threshold.
3
Cell priority
Meaning
0~63dB
1
Major HO Parameters Configuration [Cell Description Table] -2 Parameter Meaning Value range name Penalty on It is valid when the fast m oving handover algorithm is 0~63dB MS Fasting enabled. It is the signal level penalty value on the other moving HO neighbor cells when MS moves fast and is handed over to umbrella cell. The paramete r is only valid within the penalty time.
Recommended value 30
Penalty Time on MS Fasting moving HO Min DL level 0n candidate cell
It means that within this tim e, the penalty on the other 0~255 neighbor cells will be exerted a fter MS is handed over seconds to umbrella cell by fast moving HO.
40
This is the min signal level requirement for the cell itself 0~63 to be a candidate cell. Too low configuration may easily cause call drops, while too high a configuration might turn handover too hard to occur.
15
Major HO Parameters Configuration [Adjacent Cell Relation Table] -1 Parameter name Ncell ID
Min access level offset
Meaning
Value range
Neighbor cell ID index.
0~255 for internal cell; 0~799 for external cell
This offset is based on “Min downlink level of handover candidate cell”. Different offsets can be defined for different adjacent cells, and to enter the can didate cell list, the corresponding adjacent cell rec eiving signal level must be higher tha n the sum of “Mi n downlink level of handover candidate cell” and “ Min. Access level offset”.
0~63
Recommended value
0
Major HO Parameters Configuration [Adjacent Cell Relation Table] -2 Parameter Meaning Value range name PBGT HO It means that PBGT handover is performed when the 0~127,corresp Thrsh. difference between the target cell downlink path loss and the onding to serving cell downlink path loss is bigger than PBGT handover --64~63dB threshold. Whe n PBGT handover is enabled , and “Inter -cell handover hysteresis” > “PBGT handover threshold (corresponding dB value)”, “Inter -cell handover hysteresis” takes place of “PBGT handover threshold” to act. . PBGT handover threshold also needs to be adjusted acc ording to handover performance statistics result.
Recommended value It is around 68 in the densely populated downtown, and around 72 on the outskirts.
Inter-cell HO Handover hysteresis between an adjacent cell and the serving 0~63db hysteresis cell. It is set to reduce “Ping -pang” HO. The hysteresis value also needs to be adjusted according to the handover performance statistics result and live network. Flexible configuration of the value can effectively lead handover and traffic between two adjacent cells.
It is around 4 in the densely populated downtown, and around 8 on the outskirts.
Major HO Parameters Configuration [Penalty Table] -1 Parameter name Penalty level after HO fail
Meaning
Value range
The signal level value in dB, to punish the target cell which has caused a HO failure due to problems such as congestion , to prevent MS from a handover re-attempt to that ce ll again. This value is only valid within the penalty time for handover failure.
0~63dB
Recommended value 30
Penalty time after HO fail Penalty level after BQ HO fail
Penalty time on the corresponding target cell after handover failure The signal level pen alty value for the original serving cell, to avoid “Ping -pang” handover after emergency handover upon bad quality. It is only valid within the penalty time for BQ HO.
0~60 seconds
10
0~63dB
63
Penalty time after BQ HO fail
Penalty time for the original serving cell after BQ HO.
0~60 seconds
10
Major HO Parameters Configuration [Penalty Table] -2
Parameter Meaning Value range name Penalty The signal strength penalty value for the original serving cell, 0~63dB level after to avoid “Ping -pang” handover after TA emergency TA HO fail handover. It is only valid within the penalty time for ta handover.
Recommended value 63
Penalty time after TA HO fail Penalty time after IUO HO fail
0~60Seconds
10
After an overlaid/underlaid handover failure (big circle hands 0~16Seconds over to small circle o r vice versa), within certain time (this parameter configuration value) overlaid/und erlaid handover is forbidden for the same call.
10
Penalty time for the original serving cell after TA emergency handover.
Major HO Parameters Configuration [Emergency Handover Table] -1 Parameter name
Meaning
Value range
Recommended value
TA Thrsh.
When TA≥this value, emergency handover is triggered
0~63 bit period
63
DL QUAL. Thrsh
The downlink receiving quality threshold for BQ emergency handover. When frequency hopping or DTX is enabled, RQ becomes worse (normal phenomenon), this value should be set to 70. The adjustment should also base on the current network quality and handover statistics. When triggering emergency handover, the first to select is the intercell handover, the intra-cell handover is only triggered when there is no candidate cell and the intra-cell handover is allowed in the serving cell.
0~70, correspondin g to BQ levels of 0~7
60
UL QUAL. Thrsh.
The uplink receiving quality threshold for BQ emergency HO.
correspondin g to BQ levels of 0~7
60
Major HO Parameters Configuration [Emergency Handover Table] -2 Parameter name UL Qual.Thrsh. for interf. HO
Meaning
Value range
Recommended value Uplink receiving quality threshold in the serving cell for corresponding 50, interference interference handover. When frequency hopping or DTX is to BQ levels of quality threshold enbaled, RQ becomes worse (normal phenomenon), this 0~7 must be better than value should be set to 60. The adjustment should also base the emergency on the current network quality and handover statistics. When quality threshold triggering interference handover. If the serving cell is in the first position and intra-cell handover is permitted, perform intra-cell handover. Otherwise select the second candidate cell to perform inter-cell handover.
DL Qual. Thrsh. For interf HO.
Downlink receiving quality threshold in the serving cell for interference handover.
0~70, 50 corresponding to BQ levels of 0~7
Major HO Parameters Configuration [Emergency Handover Table] -3 Paramete r name UL RX_LEV Thrsh. for interf.HO
DL RX_LEV Thrsh. for interf HO.
Meaning
Value range
Min uplink receiving power threshold from the serving cell 0~63 required for interf. HO, when interference handover is triggered if the uplink quality is worse than quality thr eshold and at this time the uplink signal level is higher than the signal threshold. When triggering interference handover, If the serving cell is in the first posi tion in the cell list, and intra-cell handover permitted, then start intra -cell HO. Otherwis e select the second cell to perform inter-cell HO. Min downlink receiving power threshold from the serving cell 0~63 required for interf. HO.
Recommended value 25
30
Major HO Parameters Configuration [Load Handover Table] -1 Parameter name System flux Thrsh. for load HO
Load HO Thrsh
Meaning The pre-condition for load HO is that the system flow (signaling flow) is lower the threshold. This value can not be set too high because load handover upon max threshold may cause serious effect to the system. Load handover is triggered when the serving cell load is higher than the threshold, TCH seized in the cell has reaching the corresponding percentage.
Load Req. on The Load threshold for the ta rget cells that can accept MS from candidate cell serving cell in load HO, i.e. when the TCH under Idle mode in the neigh bor cell is lower than the corresponding percentage , the cell refuses to accept MS from serving cell handed over due to the load reason.
Value range
Recommended value 10
0, 8~11 system flow levels, corresponding to 0, 70, 80, 90 and 95. 0~7 cell load 5 levels, corresponding to 0, 50, 60, 70, 75, 80, 85, 90 0~7, 2 corresponding to 0, 50, 60, 70, 75, 80, 85, 90
Major HO Parameters Configuration [Normal Handover Table] -1 Parameter Meaning name Edge HO UL During the statistics time, if the time in which the uplink receiving level is lower than the value is longer than RX_LEV certain time called continuous time, edge handover Thrsh. will be performed. If PBGT handover is enabled, Corresponding edge handover threshold will be set lower.
Edge HO DL Downlink consideration for edge HO. RX_LEV Thrsh.
Value range
Recommended value
0~63
25 (without PBGT handover, downtown), 15 (single station on outskirts), 15 (with PBGT handover, downtown)
63
30 (without PBGT handover, downtown), 20 (single station on outskirts), 20 (with PBGT handover, downtown)
Major HO Parameters Configuration [Normal Handover Table] -2 Parameter name Edge HO watch time
Edge time
Meaning
It means that within the time statistics, if the time in which the signal level is lower than threshold is higher than the continuous time, then margin HO is to be triggered. valid See the above.
Value range
Recommended value
1~16 seconds
5
1~16 seconds
4
Major HO Parameters Configuration [Normal Handover Table] -3 Parameter Meaning name PBGT watch Statistics time for PBGT HO signal level judgment. time
PBGT time
valid Continuous time for PBGT HO signal level judgment.
Value range
Recommended value
1~16 seconds
5
1~16 seconds
4
Major HO Parameters Configuration [Normal Handover Table] -4 Parameter name Layer HO watch time Layer HO valid time
Meaning
Value range
Recommended value
Statistics time for Layer HO judgment
1~16 seconds
5
Continuous time for Layer HO judgment.
1~16 seconds
4
Major HO Parameters Configuration [Fast-Moving Handover Table] Parameter name MS Fast-moving watch cells MS Fast-moving valid cells
MS Fast-moving time Thrsh.
Meaning The cell sum P for judge whether MS is fast moving. The value, if too large, may cause abrupt increase of system flow, while too small value may cause inaccurate judgment for fast moving MS.
Value range 1~10
The cell sum N by which MS actually quickly es. If 1~10 within P cells that MS continuously past, the number of cells by which the MS is judged to quickly is equal to or more than N, then the MS will b e judged as a fast moving MS. The time threshold (2r/v) determined by the cell radius 0~255 (r) and moving speed (v). If the time in which MS seconds es the cell is smaller than the threshold, then MS is judged to quickly the cell.
Recommended value 3
2
15
Major HO Parameters Configuration [Concentric Cell Handover Table] -1 Parameter name UO signal intensity difference
Meaning
Value range
BTS transmitting Power difference between 0~63db underlaid and overlaid may cause MS receiving signal intensity difference in underlaid and overlaid . The parameter uaually indicates the antenna EIRP difference in dB between underlaid cell and overlaid cell. According to field measurement, multi-point measurement is necessary if the underlaid and overlaid use different antenna.
Recommended value Set according to actual conditions
Major HO Parameters Configuration [Concentric Cell Handover Table] -2 Parameter name
Meaning
Value range
Recommended value
RX_LEV Thrsh
Rx level hysteresis, TA threshold and TA hysteresis tly define underlaid area and overlaid area. It must be bigger than edge handover threshold, and the recommended value is: edge handover threshold + signal intensity difference between underlaid and overlaid .
0~63
25
RX_LEV hysteresis
Works with Rx threshold.
0~63
5
TA Thrsh.
It must be bigger than TA emergency handover threshold.
0~63 bit period, with 1 bit period corresponding to 0.55km
TA hysteresis
Works with TA threshold.
0~63 bit period
Major HO Parameters Configuration
[Concentric Cell Handover Table] -3 Parameter name
Meaning
UO HO watch time P/N judgment statistics time for U/O HO judgment.
UO HO valid time
P/N judgment continuous time for U/O HO judgment.
Value range 0~16 seconds
Recommended value 5
0~16 seconds
4
Major HO Parameters Configuration [Concentric Cell Handover Table] -4 Parameter name
Meaning
Value range
Assign optimum layer
In Overlaid/Underlaid, the following selection are available for TCH assignment: (1) The system judges according to the measurement report on SDCCH and assign to the best sub-cell. (2) Select the overlaid first for TCH assignment. (3) Select the underlaid first for TCH assignment. (4) Do not give extra priority.
System optimization, overlaid , underlaid , no preferential
Assignoptimum level Thrsh.
If system optimization is selected, estimate (interpolate, filter) current SDCCH level value through uplink measurement value in the former SDCCH measurement report, and compare with “ Assign-optimum Level threshold”, so as to assign overlaid or underlaid channel. If SDCCH is in the overlaid : edge handover threshold + signal intensity difference between underlaid and overlaid + uplink and downlink balance allowance + SDCCH and TCH difference allowance. If SDCCH is in the underlaid : edge handover threshold + uplink and downlink balance allowance + SDCCH and TCH difference allowance.
0~63
Recommended value System optimization
Major HO Parameters Configuration
[Concentric Cell Handover Table] -5 Parameter name
Meaning
Value range
Recommended value
Pref. subcell in HO of intra-BSC
When the cell is configured into a Overlaid/Underlaid, there are two processing methods for incoming handover request in BSC: (1) No special processing for channel assignment. (2) Add BCCH signal level value of the target cell in intercell handover request message to BSC to make BSC allocate optimum channel for MS from underlaid or overlaid .
Yes, No
Yes
Incoming-toBSC HO optimum layer
If there is a incoming BSC HO, and the target cell is a Overlaid/Underlaid, then, this parameter will show which layer is preferred to provide service for the MS.
overlaid , underlaid , none
None
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