6.2.1 GbrUsageSwitch (Switch for Detecting the Number of PRBs Occupied by GBR Services)
Description
Meaning: This parameter indicates whether the number of physical resource blocks (PRBs) occupied by GBR services is under control.
Value type: enumeration Value range: On, Off Unit: none
Default value: Off
Impact scope: cell
Setting
If this parameter is set to Off, GBR services may occupy excessive PRB resources because the scheduling algorithm preferentially guarantees GBR services except for IP Multimedia Subsystem (IMS) signaling. As a result, the admission rate is low. If this parameter is set to On, the proportion of PRBs occupied by GBR services is limited. This improves the admission rate and handover success rate, but uses more resources.
Related Commands
LST CELLALGOSWITCH:;
MOD CELLALGOSWITCH: LOCALCELLID=0, RACALGOSWITCH=GbrUsageSwitch-0;
6.2.2 GbrRbUsedHighThd (GBR used resource high proportion threshold)
Description
Meaning: This parameter indicates the upper threshold of the proportion of PRBs occupied by GBR services.
This parameter applies to both the uplink and the downlink. If the proportion of PRBs occupied by GBR services is greater than the value of this parameter and GbrUsageSwitch under the RacAlgoSwitch parameter is set to On, the system rejects new GBR service access requests.
Value type: integer Value range: 0 to 100 Unit: %
Default value: 95 Impact scope: cell
Setting
Decreasing the value of this parameter reduces the proportion of PRBs occupied by GBR services and the admission success rate of GBR services. As a result, PRBs cannot be fully used. Increasing the value of this parameter increases the offline rate of non-GBR services and the call drop rate.
Related Commands
LST CELLRACTHD;
MOD CELLRACTHD: LOCALCELLID=0, GBRRBUSEDHIGHTHD=0;
6.2.3 GbrRbUsedLowThd (GBR used resource low proportion threshold)
Description
Meaning: This parameter indicates the lower threshold of the proportion of PRBs occupied by GBR services. If the PRB usage of GBR services falls below the threshold, the usage is considered to be low.
Value type: integer Value range: 0 to 100 Unit: %
Default value: 90 Impact scope: cell
Setting
Decreasing the value of this parameter reduces the possibility for reporting the message indicating a low PRB usage and increases the number of GBR service admission failures.
Increasing the value of this parameter increases the possibility for frequent switching between the high PRB usage indication and the low PRB usage indication.
Related Commands
LST CELLRACTHD;
MOD CELLRACTHD: LOCALCELLID=0, GBRRBUSEDLOWTHD=0;
6.2.4 DlRbLowThd (Downlink RB used ratio low threshold)
Description
Meaning: This parameter indicates the lower threshold of the proportion of downlink RBs occupied. It is used to determine whether a service admission request is accepted in the downlink. If the downlink RB usage reported by the MAC layer is less than the value of this parameter, the downlink RB usage is low.
Value type: integer Value range: 10 to 100 Unit: %
Default value: 90 Impact scope: cell
Setting
Increasing the value of this parameter increases the possibility for generating the low RB usage indication in the downlink, which may cause excessive admission, but the protection
for resource allocation is performed after the admission decision. Therefore, this parameter has no obvious impact on the overall QoS satisfaction rate.
Decreasing the value of this parameter reduces the possibility for generating the low RB usage indication in the downlink and the admission success rate, but the protection for resource allocation is performed after the admission decision. Therefore, this parameter has no obvious impact on admission. In addition, when the value of the parameter is small, the load control algorithm may mistakenly trigger the service release, which will increase the call drop rate.
Related Commands
LST CELLRACTHD;
MOD CELLRACTHD: LOCALCELLID=0, DLRBLOWTHD=10;
6.2.5 DlRbHighThd (Downlink RB used ratio high threshold)
Description
Meaning: This parameter indicates the upper threshold of the proportion of downlink RBs occupied. It is used to determine whether a service admission request is accepted in the downlink. If the downlink RB usage reported by the MAC layer is greater than the value of this parameter, the downlink RB usage is high.
Value type: integer Value range: 10 to 100 Unit: %
Default value: 95 Impact scope: cell
Setting
Increasing the value of this parameter reduces the possibility for generating the high RB usage indication in the downlink, which may cause excessive admission, but the protection for resource allocation is performed after the admission decision. In addition, when the value of the parameter is too large, load control actions are taken more slowly.
Decreasing the value of this parameter increases the possibility for generating the high RB usage indication in the downlink, but the satisfaction rates are compared further for admission decision. Therefore, this parameter has no obvious impact on admission. In addition, when the value of the parameter is too small, excessive load control actions may be taken.
Related Commands
LST CELLRACTHD;
MOD CELLRACTHD: LOCALCELLID=0, DLRBHIGHTHD=10;
6.2.6 UlRbLowThd (Uplink RB used ratio low threshold)
Description
Meaning: This parameter indicates the lower threshold of the proportion of uplink RBs
occupied. It is used to determine whether a service admission request is accepted in the uplink.
If the uplink RB usage reported by the MAC layer is less than the value of this parameter, the uplink RB usage is low.
Value type: integer Value range: 10 to 100 Unit: %
Default value: 90 Impact scope: cell
Setting
Increasing the value of this parameter increases the possibility for generating the low RB usage indication in the uplink, which may cause excessive admission, but the protection for resource allocation is performed after the admission decision. Therefore, this parameter has no obvious impact on the overall QoS satisfaction rate.
Decreasing the value of this parameter reduces the possibility for generating the low RB usage indication in the uplink and the admission success rate, but the protection for resource allocation is performed after the admission decision. Therefore, this parameter has no obvious impact on admission. In addition, when the value of the parameter is small, the load control algorithm may mistakenly trigger the service release, which will increase the call drop rate.
Related Commands
LST CELLRACTHD;
MOD CELLRACTHD: LOCALCELLID=0, ULRBLOWTHD=10;
6.2.7 UlRbHighThd (Uplink RB used ratio high threshold)
Description
Meaning: This parameter indicates the upper threshold of the proportion of uplink RBs
occupied. It is used to determine whether a service admission request is accepted in the uplink.
If the uplink RB usage reported by the MAC layer is greater than the value of this parameter, the uplink RB usage is high.
Value type: integer Value range: 10 to 100 Unit: %
Default value: 95 Impact scope: cell
Setting
Increasing the value of this parameter reduces the possibility for generating the high RB usage indication in the uplink, which may cause excessive admission, but the protection for resource allocation is performed after the admission decision. In addition, when the value of the parameter is too large, load control actions are taken more slowly.
Decreasing the value of this parameter increases the possibility for generating the high RB usage indication in the uplink, but the satisfaction rates are compared further for admission decision. Therefore, this parameter has no obvious impact on admission. In addition, when the value of the parameter is too small, excessive load control actions may be taken.
Related Commands
LST CELLRACTHD;
MOD CELLRACTHD: LOCALCELLID=0, ULRBHIGHTHD=10;
6.2.8 MaxNonGBRBearerNum (Non-GBR max bearer number)
Description
Meaning: This parameter indicates the maximum number of non-GBR services excluding IMS services. This parameter applies to both the uplink and the downlink.
Value type: integer Value range:
0 to 560 for a cell with a 1.4 MHz bandwidth
0 to 1800 for a cell with a 3 MHz bandwidth
0 to 3000 for a cell with a 5 MHz bandwidth
0 to 3000 for a cell with a 10 MHz bandwidth
0 to 6000 for a cell with a 15 MHz bandwidth
0 to 6000 for a cell with a 20 MHz bandwidth Unit: none
Default value: 3000 Impact scope: cell
Setting
Increasing the value of this parameter increases the number of non-GBR services admitted.
Related Commands
LST CELLRACTHD;
MOD CELLRACTHD: LOCALCELLID=0, MAXNONGBRBEARERNUM=0;