2.5.11 2G Load Threshold by Inter-RAT Handover in PS-domain
QUEUEPREEMPT Query: LST
CORRMALGOSWITCH QUEUEALGOSWITCH and PREEMPTALGOSWITC Set or modify: SET
QUEUEPREEMPT
80 Set: ADD CELLCAC
Query: LST CELLCAC
S
S
SF16 Set: ADD CELLCAC
Query: LST CELLCAC
3.1 Uplink and Downlink Initial Access Rates of BE Services
This describes the uplink and downlink initial access rates when BE services are set up.
3.2 Intelligent Admission Algorithm Switch
This describes the intelligent admission algorithm switch. The intelligent admission algorithm switch consists of four subordinate algorithm switches: the maximum rate negotiation switch (IU_QOS_NEG_SWITCH), the initial rate selecting switch
(RAB_DOWNSIZING_SWITCH), the queuing algorithm (QUEUEALGOSWITCH), and the preemption algorithm (PREEMPTALGOSWITCH).
3.3 Uplink Total Equivalent User Number
This describes the uplink total equivalent user number. When algorithm 2 is used, this parameter defines the total equivalent user number corresponding to the 100% uplink load.
3.4 Downlink Total Equivalent User Number
This describes the downlink total equivalent user number. When algorithm 2 is used, this parameter defines the total equivalent user number corresponding to the 100% downlink load.
3.5 AMR Voice Uplink Threshold for Conversation Service
The uplink threshold for the conversation service is used for the uplink admission of conversation service users.
3.6 Non AMR Voice Uplink Threshold of Conversation Service
This parameter is the uplink threshold of non AMR voice service in the conversation service and used for uplink admission for non AMR voice user in the conversation service.
3.7 AMR-Voice Downlink Threshold of Conversational Services
This describes the AMR-voice downlink thresholds of conversational services, based on which the downlink admission of AMR-voice subscribers of conversational services is implemented.
3.8 Non-AMR-Voice Downlink Threshold of Conversational Services
This describes the non-AMR-voice downlink thresholds of conversational services, based on which the downlink admission of non-AMR-voice subscribers of conversational services is implemented.
3.9 Uplink Threshold for Other Services
This parameter is the uplink threshold for services other than the conversation service. It is used for uplink admission of other services.
3.10 Downlink Admission Threshold of Other Services
This describes the downlink admission threshold of other services, based on which the downlink admission of subscribers of non conversational services is implemented.
3.11 Uplink Handover Admission Threshold
The uplink handover threshold is used for uplink admission of handover users. The parameter is only useful for uplink inter-frequency handover. Do not do the admission judgment in the uplink soft handover.
3.12 Downlink Handover Admission Threshold
This describes the downlink handover admission threshold, based on which the downlink admission of handover subscribers is implemented.
3.13 Uplink Total Power Threshold
The total uplink power threshold of the cell is used for admission of HSPA uplink power resource.
3.14 Downlink Total Power Threshold
This describes the total downlink power threshold of the cell (PR99 + GBP), which is used for the admission of HSPA downlink power resource.
3.15 Reserved SF of the Uplink Credit Resource for Handovers
This describes the reserved threshold for the uplink credit handover. The threshold is used for the admission of uplink credit for new subscribers.
3.16 Reserved SF of the Downlink Credit Resource and Channel Code Resource for Handovers This describes the spreading factor (SF) threshold of the downlink code resources and CE resources reserved for the handover. This parameter is used for the admission of downlink code resources and credit for new subscribers.
3.17 Resources Reserved for Common Channel Load
This describes the uplink common channel load factor and the downlink common channel load factor. ULCCHLOADFACTOR is used to reserve the resource for the uplink common channel, and DLCCHLOADRSRVCOEFF is used to reserve the resource for the downlink common channel.
3.1 Uplink and Downlink Initial Access Rates of BE Services
This describes the uplink and downlink initial access rates when BE services are set up.
ID
ULBeTraffInitBitrate DLBeTraffInitBitrate
Value Range
ULBeTraffInitBitrate: Enum (D8, D16, D32, D64, D128, D144, D256, D384, D608, D1024, D1450, D2048)
DLBeTraffInitBitrate: Enum (D8, D16, D32, D64, D128, D144, D256, D384, D768, D1024, D1536, D1800, D2048)
Physical Scope
ULBeTraffInitBitrate: Enum (8, 16, 32, 64, 128, 144, 256, 384, 608, 1024, 1450, 2048) kbit/s DLBeTraffInitBitrate: Enum (8, 16, 32, 64, 128, 144, 256, 384, 768, 1024, 1536, 1800, 2048) kbit/s
Setting
The default value is D64.
To save the system resources and promote the admission success rate, the UE needs not to access with the maximum expected rate but implement the initial access with a comparatively low rate when the BE services are being set up. After the access, the rate can be increased when the traffic requires a higher rate and the system resources meet the demand.
When the DCCC function is enabled, the values are the uplink and downlink initial access rates when the BE services are set up if the value is lower than the maximum bit rate. If the initial access rates do not meet the demand of the current load, the actual initial access rate is obtained through negotiation on the basis of the uplink and downlink initial access rates when the BE services are set up.
NOTE
When the uplink and downlink load is in initial congestion state, or the Iub transmission resources is in congestion state, the current intelligent admission algorithm uses the minimum rate (generally 8 kbit/s) in the set of optional rates for the BE service as the access rate instead of gradually decreasing the initial access rate through negotiation. When either the uplink load or the downlink load is in congestion, the UE access is rejected without any process of decreasing the rate.
Impact on the Network Performance
l If ULBeTraffInitBitrate and DLBeTraffInitBitrate are set to comparatively higher values, the access rate of the BE services needs a shorter time to reach the maximum value, but the rate is more easily to be decreased through negotiation when the system is in congestion, so it is improper to set the access rate to an excessively high value.
l If ULBeTraffInitBitrate and DLBeTraffInitBitrate are set to comparatively lower values, the BE services can access with the rate more easily, but it takes a long time for the rate to increase to the rate required by some services.
Related Commands
Use SET FRC to set and LST FRC to query ULBeTraffInitBitrate and DLBeTraffInitBitrate.
3.2 Intelligent Admission Algorithm Switch
This describes the intelligent admission algorithm switch. The intelligent admission algorithm switch consists of four subordinate algorithm switches: the maximum rate negotiation switch (IU_QOS_NEG_SWITCH), the initial rate selecting switch
(RAB_DOWNSIZING_SWITCH), the queuing algorithm (QUEUEALGOSWITCH), and the preemption algorithm (PREEMPTALGOSWITCH).
ID
IU_QOS_NEG_SWITCH RAB_DOWNSIZING_SWITCH QUEUEALGOSWITCH
PREEMPTALGOSWITCH
Value Range
IU_QOS_NEG_SWITCH and RAB_DOWNSIZING_SWITCH: Enum (0, 1) QUEUEALGOSWITCH and PREEMPTALGOSWITC: ON, OFF
Physical Scope
IU_QOS_NEG_SWITCH and RAB_DOWNSIZING_SWITCH: 0 means disabled, 1 means enabled.
QUEUEALGOSWITCH and PREEMPTALGOSWITC: ON means enabled, OFF means disabled.
Setting
The default value of IU_QOS_NEG_SWITCH is 0, and the default value of RAB_DOWNSIZING_SWITCH is 1.
The default values of QUEUEALGOSWITCH and PREEMPTALGOSWITC are OFF.
The descriptions of the sub algorithms are as follows:
l Maximum rate negotiation: At the RAB assignment setup, RAB assignment modification, and RAB transition, the real-time services or non-real-time services (BE) at the PS domain requires rate negotiation based on the UE supported capability to get the maximum expected rate of a proper service QoS request. This negotiation result should be sent to the CN. For the BE service, it is the maximum rate that can be reached through adjustment by its DCCC.
l RAB downsizing: At the RAB assignment setup, RAB assignment modification, and RAB transition, the real-time or non-real-time (BE) service of PS domain requires selection of a proper initial rate from the typical rates that are smaller than or equal to the maximum expected rate after negotiation and bigger than or equal to the lowest guaranteed rate according to the cell load information before application for cell resources. The bandwidth is configured on the basis of the selected initial rate.
l Preemption: At the service setup, modification, hard handover, and transition-in, if service request supports preemption capability (configured in CN) when an application for cell resources fails, the system implements preemption and releases the resources of lower-priority users that can be preempted to have the service request be set up.
l Queuing: At the service setup, modification, hard handover and transition-in, if service requests do not support preemption capability but supports the queuing capability or the preemption switch is closed when an application for cell resources fails, a queuing process is implemented. When the heartbeat timer of queuing is in the timeout state, the system attempts to allocate resources to the service request with the minimum metric in the queue.
Impact on the Network Performance
IU_QOS_NEG_SWITCH and RAB_DOWNSIZING_SWITCH are set based on the actual demand and the supporting capacity of the core network.
Preemption may increase the admission success rate of subscribers with high priority, but the preemption also may make the preempted subscriber be released. Queuing may increase the admission success rate of RAB, but the queuing also may increase the admission time delay of queuing subscribers.
Related Commands
Use SET CORRMALGOSWITCH to set or modify and LST CORRMALGOSWITCH to query IU_QOS_NEG_SWITCH and RAB_DOWNSIZING_SWITCH.
Use SET QUEUEPREEMPT to set or modify and LST QUEUEPREEMPT to query QUEUEALGOSWITCH and PREEMPTALGOSWITCH.
3.3 Uplink Total Equivalent User Number
This describes the uplink total equivalent user number. When algorithm 2 is used, this parameter defines the total equivalent user number corresponding to the 100% uplink load.
ID
UlTotalEqUserNum
Value Range
0 to 200
Physical Scope
0 to 200, with the step of 1
Setting
The default value is 80.
When algorithm 2 is used, the actual admission equivalent user number is equal to the admission threshold multiplied by the equivalent user number corresponding to the 100% load. This parameter defines the equivalent user number corresponding to the 100% load.
Impact on the Network Performance
This parameter should be considered with the admission threshold. It should be set according to the actual network condition.
l If UlTotalEqUserNum is excessively high, the system load after admission probably becomes excessively high, which affects the system stability and results in system congestion.
l If UlTotalEqUserNum is excessively low, the subscribers are more likely to be rejected, and some resources are idled and wasted.
Related Commands
Use ADD CELLCAC to set, LST CELLCAC to query, and MOD CELLCAC to modify UlTotalEqUserNum.
3.4 Downlink Total Equivalent User Number
This describes the downlink total equivalent user number. When algorithm 2 is used, this parameter defines the total equivalent user number corresponding to the 100% downlink load.
ID
DlTotalEqUserNum
Value Range
0 to 200
Physical Scope
0 to 200, with the step of 1
Setting
The default value is 80.
When the algorithm 2 is used, the actual admission equivalent user number is equal to the admission threshold multiplied by the equivalent user number corresponding to the 100% load.
This parameter defines the equivalent user number corresponding to the 100% load.
Impact on the Network Performance
This parameter should be considered with the admission threshold. It should be set according to the actual network condition.
l If DlTotalEqUserNum is excessively high, the system load after admission probably becomes excessively high, which affects the system stability and results in system congestion.
l If DlTotalEqUserNum is excessively low, the subscribers are more likely to be rejected, and some resources are idled and wasted.
Related Commands
Use ADD CELLCAC to set, LST CELLCAC to query, and MOD CELLCAC to modify DlTotalEqUserNum.
3.5 AMR Voice Uplink Threshold for Conversation Service
The uplink threshold for the conversation service is used for the uplink admission of conversation service users.
Parameter ID
UlNonCtrlThdForAMR
Value Range
0 to 100
Physical Value Range
0 to 100%, step 1%
Parameter Setting
The default value is 75, that is 75%.
Based on the current load factor of the system and the service properties of the call requesting for admission, the uplink admission control algorithm predicts the load factor of the system after the new call is admitted, uses the sum of the predicted load factor value and the common channel uplink load factor as the predicted value of the new load factor, and then compares the predicted value of the load factor with the load factor threshold. If the predicted load factor value is not bigger than the load factor threshold, the call will be admitted; otherwise it is rejected.
The uplink load thresholds include this parameter and uplink threshold for conversation non-AMR service, uplink threshold for other services and uplink handover admission
threshold. According to the relations among these four parameters, the proportions of the conversation service and other services in the cell can be limited. These parameters can be also used to ensure the priorities of handover users and the conversation service access.
Impact on the Network Performance
If this parameter is too high, the system load after admission probably is too high, which affects the system stability and results in system congestion; if it is too low, the users are more likely to be rejected, and some resources are idled and wasted.
This parameter, uplink threshold for conversation non-AMR service, uplink threshold for other services and uplink handover admission threshold should be considered together with the network planning results.
l If this parameter is too high, the target coverage in the network planning is influenced.
l If it is too low, the target capacity cannot be satisfied.
Relevant Commands
Set this parameter through ADD CELLCAC, query it through LST CELLCAC, and modify it through MOD CELLCAC.
3.6 Non AMR Voice Uplink Threshold of Conversation Service
This parameter is the uplink threshold of non AMR voice service in the conversation service and used for uplink admission for non AMR voice user in the conversation service.
Parameter ID
UlNonCtrlThdForNonAMR
Value Range
0 to 100
Physical Value Range
0 to 100%, step 1%
Parameter Setting
The default value is 75, that is 75%.
The uplink admission control algorithm predicts the system load factor after admission of new call according to the load factor of current system and service feature of admission request call.
It uses the sum of the load factor predicted value and the uplink load factor of public channel as the new load factor predicted value, and then compares the load factor predicted value with the load factor threshold. If the load factor predicted value is not bigger than the load factor threshold, this call is admitted, or else it is refused.
Uplink load thresholds include this parameter, AMR voice uplink threshold of conversation service, Uplink thresholds of other services and Uplink handover admission threshold. You can restrict the proportion of conversation to other services in cell based on relations of the four parameters or use them to ensure the priority of handover user and conversation service access.
Impact on the Network Performance
If this parameter is set too high, the system load after admission may be overly heavy to affect the system stability, resulting in system congestion. If this parameter is too low, the users are more likely to be rejected, and some resources may be left idle.
This parameter, AMR voice uplink threshold of conversation service, Uplink thresholds of other services and Uplink handover admission threshold should be considered together with the planning result of network optimization to avoid over-big set target coverage affecting network optimization, or too-small coverage that can not reach the target capacity.
Relevant Commands
Set this parameter through ADD CELLCAC, query it through LST CELLCAC, and modify it through MOD CELLCAC.
3.7 AMR-Voice Downlink Threshold of Conversational Services
This describes the AMR-voice downlink thresholds of conversational services, based on which the downlink admission of AMR-voice subscribers of conversational services is implemented.
ID
DlConvAMRThd
Value Range
0 to 100
Physical Scope
0% to 100%, with the step of 1%
Setting
The default value of DlConvAMRThd is 80, namely 80%.
According to the load factor of current system and service feature of admission request call, the downlink admission control algorithm predicts the system load factor after admission of new calls. It uses the sum of the load factor predicted value and the downlink load factor of public channel as the new load factor predicted value, and then compares the load factor predicted value with the load factor threshold. If the load factor predicted value is not bigger than the load factor threshold, this call is admitted, or else it is rejected.
The downlink load thresholds are the AMR-voice downlink threshold of conversational services, non-AMR-voice downlink threshold of conversational services, and downlink threshold for other services. You can restrict the proportion of voice services to other services in the cell based on relations of the four parameters or use them to guarantee the access priority of voice services.
Impact on the Network Performance
The setting of DlConvAMRThd is related to the settings of cell radius and the maximum cell transmit power.
l If DlConvAMRThd is set to an excessively high value, the downlink coverage of the cell is reduced, the neighboring cells are interfered seriously, and the system stability is affected when the cell coverage is very small.
l If DlConvAMRThd is set to an excessively low value, the system resources may be idled, and the target capacity of the network planning cannot be reached.
The AMR-voice downlink threshold of conversational services, non-AMR-voice downlink threshold of conversational services, downlink threshold for other services, and downlink handover admission threshold are set on the basis of the network planning result.
Related Commands
Use ADD CELLCAC to set, LST CELLCAC to query, and MOD CELLCAC to modify DlConvAMRThd.
3.8 Non-AMR-Voice Downlink Threshold of Conversational Services
This describes the non-AMR-voice downlink thresholds of conversational services, based on which the downlink admission of non-AMR-voice subscribers of conversational services is implemented.
ID
DlConvNonAMRThd
Value Range
0 to 100
Physical Scope
0% to 100%, with the step of 1%
Setting
The default value of DlConvNonAMRThd is 80, namely 80%.
According to the load factor of current system and service feature of admission request call, the downlink admission control algorithm predicts the system load factor after admission of new calls. It uses the sum of the load factor predicted value and the downlink load factor of public channel as the new load factor predicted value, and then compares the load factor predicted value with the load factor threshold. If the load factor predicted value is not bigger than the load factor threshold, this call is admitted, or else it is rejected.
The downlink load thresholds are the AMR-voice downlink threshold of conversational services, non-AMR-voice downlink threshold conversational services, and downlink threshold for other services. You can restrict the proportion of voice services to other services in the cell based on relations of the four parameters or use them to guarantee the access priority of voice services.
Impact on the Network Performance
The setting of DlConvNonAMRThd is related to the settings of cell radius and the maximum cell transmit power.
l If DlConvNonAMRThd is set to an excessively high value, the downlink coverage of the
l If DlConvNonAMRThd is set to an excessively high value, the downlink coverage of the