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How to Improve the Paging Success Rate Prepared by:
Sunil Kumar S
Date:
1-Feb-2012
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1-Apr-2012
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Huawei Technologies, Co., Ltd. All rights reserved
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How to Improve the Paging Success Rate 1.
paging strategy........................................................................................................................ 5
2.
IMSI implicit detach timer in VLR............................................................................................ 6
3.
Paging soft parameter audit.................................................................................................... 8
4.
a.
P164 BIT4........................................................................................................................... 8
b.
P140 BIT4........................................................................................................................... 8
c.
P166 BIT15....................................................................................................................... 11
d.
P1151 BIT7....................................................................................................................... 12
e.
P163 BIT0~1..................................................................................................................... 12
The impact of paging and other service...............................................................................13 a.
Impact with location update.............................................................................................. 14
b.
the impact of paging and service access..........................................................................15
c.
The impact of paging and user switch off.........................................................................16
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Key words: Paging/MSC
Summary: In I country A project, customer require us to improve the PSR from 87% to 93%, after audit all the paging parameter in MSC, some parameter is suggested to modify to improve the KPI.
List of abbreviations: NULL
References: < HUAWEI MSOFTX3000 Mobile SoftSwitch Center Product Documentation-(V200R008C03_09)>; < (V1R8C3)MSOFTX3000 Software Parameters Use Guide>
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Before audit the MSC parameter pls first confirm the transimision of Iu/A interface is working fine. 1. paging strategy
Normally the paging strategy as below: 3 paging times, the paging duration are 5s/5s/6s, First Paging with TMSI/Second Paging with IMSI/Third Paging with IMSI, First Paging send to current LAI/Second Paging send to current LAI/Third Paging send to all RAN
From the paging counter: we can found out in A interface, the first paging times is most, the second paging times is less, the third paging times is least.
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From paging counter report, suggest to modify the paging strategy as : 3 paging times, modify the paging duration as 6s/5s/5s, First Paging with TMSI/Second Paging with IMSI/Third Paging with IMSI, First Paging send to current LAI/Second Paging send to current LAI/Third Paging send to current LAI. Modify the third paging as LAI. 2. IMSI implicit detach timer in VLR
As network optimization experience, if the IMSI implicit detach timer in MSC is more than 2 hours, so after reduce the IMSI implicit detach timer, it will improve the paging success rate obviously. Because reduce the implicit timer, it will helpful for MSC understand the UE state ASAP. The MSC will not paging the UE implicit detached by MSC, it will reduce the no response times. But the problem is at the same time to improve the paging success rate, the UE state “The user is switch off” will be increase. So suggest set the MSC implicit detach timer 1.1 times to 1.2 times as BSC T3212. If the BSC T3212 is less than 30 min, so the MSC implicit detach timer set 2 times and 5 min; if the BSC T3212 is more than 30 min, we set MSC implicit detach timer 1 times and 5-10 min as BSC T3212.
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3. Paging soft parameter audit.
a. P164 BIT4 Normal MSC is not the global multi-area network, the paging soft parameter P164 BIT4, the default value is “0”.
b. P140 BIT4 The function of pre-paging, now the MSC setting is not support pre-paging function, and the soft parameter P140 BIT4 is “0”.
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c. P166 BIT15 The call is released before ringing. The system already open. For the situation of the call is released before ringing, it might be the paging already release but again come. As usual, system do not measure the paging response, but if this situation is too many, it will affect the paging success rate too much, as usual, it will decrease the paging success rate 0.1~0.2%. P166 BIT15 controls whether to measure the PAGING RESP message when a call is released before ringing. If open, the MSC will measure the PAGING RESP when the call is released before ringing, include the MTC PAGING RESP, PAGING RESP during Location update, first paging RESP as first paging resp.
d. P1151 BIT7 5/23/2016
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When GS paging fail, in default, the MSC will send the paging message via A/IU to improve the paging success rate, the soft parameter P1151 BIT7 determines whether to change the paging route if the system receive the location update request message through the Gs-interface when paging through the A-interface or the system receive the gprs detach message through the Gs-interface when paging through the Gs-interface.
e. P163 BIT0~1 Soft parameter P163 BIT0~1, determines whether to send a paging request to the non-associated SGSN if the Gs-interface and A/Iu-interface paging request is not acknowledged.
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4. The impact of paging and other service. 5/23/2016
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a. Impact with location update. At the same time of paging, the UE start the location update, the UE will not send paging response because of UE is busy. When the location update period is short, the impact probability will increase. It will affect the paging success rate badly. There are 2 scenario: during the location update, the UE is been paged; when UE is been paged, start location update process. P1100BIT1 Controls whether to make the location area update and paging at the same time, for improving the paging success rate. If the location update fail or during the location update process the UE send a “follow on” message, paging fail. Set P1100BIT1 as 0, the MSC server will send the paging message after the UE finish the location update.
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b. the impact of paging and service access At the same time of paging, the UE start service, UE will not response because of UE busy. At this time, the paging will fail; During the user create the service of sending or receiving SMS, the user already create RR, but the access process is not finish. At this time the paging will fail; First page the terminal user, after sending the paging message, very soon, the user sending SMS, if the SMS process continue a little long, it might caused the paging expired; for above 2 scenario, after install V1R8C3SPH210 and further patch, we can use soft parameter P1100BIT15 to optimized paging procedure if a subscriber is being paged for the call service while a short message is being transmitted to the subscriber. 5/23/2016
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After the patch is installed, set bit 15 of P1100 to 0. MOD MSFP: ID=P1100, MODTYPE=P1, BIT=15, BITVAL=0; Software Parameter Description Bit 15 of P1100 (X*** **** **** ****) determines whether the MSC follows the optimized paging procedure if a subscriber is being paged for the call service while a short message is being transmitted to the subscriber. = 0: The MSC follows the optimized paging procedure to ensure that paging will be successful. = 1: The MSC follows the original paging procedure. The default value is 1.
c. The impact of paging and user switch off During paging, if the user start switch off process, the paging will no response. P166BIT14 determines whether to perform the performance measurement when an MS is powered off before sending the paging response. The involved measurement units are traffic measurement for MTC SUCC rate, paging, and MSC basic service.
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