How to improve the success rate of GSM paging

general definition of paging success rate: paging success rate = paging response times/paging request times *1%

definition of paging response times: refers to the response sum of PAGINGRES messages received by all MSC in this area. Include a secondary paging response. The statistical point is MSC.

definition of PAGING request times: refers to the sum of paging messages sent by all MSCS in this area, excluding messages of secondary paging. The statistical point is MSC.

1.1. Switching

1. Paging strategies: (1)GLOBAL paging and LAI paging; (2) Using IMSI paging and TMSI paging; using TMSI paging to increase paging channel capacity (one paging signaling can page four TMSIs, However, only two IMSI can be paged. < P > 2. The paging frequency and paging interval on the switching side are adjusted. The paging retransmission mechanism is higher than that on the BSC side. At present, the switching adopts two or three paging, sometimes the wireless channel is busy or other reasons, resulting in a very long response time, so the switching side can consider slightly extending the interval between the second paging.

3. Clear the redundant cell data of the exchange party (according to reports, The effect is not obvious)

4. SAE check

5. Routing table data and table B check

6. EXCHANGEPROPERTIES check: setting of PAGING timer, selection of repeated PAGING method, supervision timing of IMPLICITDETACH

.7, tracking of EOS4

8. Function of T3113 parameter on MSC side: paging waiting timer starts: MSC sends PAGINGREQUEST message to BSC to stop; receiving PAGINGRESPONE message from BSC times out: after the timer times out, MSC retransmits paging message and restarts T3113 timer; The number of retransmissions is customized by the network side.

9. Turn on the pre-PAGING function (for Huawei MSC)

1. Increase the second paging time and reduce the implied shutdown time

1.2. Wireless aspect

1. Location area update and cell reselection will affect paging. Refer to the setting of T3212 and CRH parameters. T3212 is reduced, so that mobile phones that are out of coverage or have no power can be registered as DETACHED as soon as possible, and no paging attempt is made to ensure that the network can contact mobile phone users as much as possible.

2.LAC division and LAC area capacity analysis, reasonably set the range of location area, and avoid LAC interruption in the base station. This can reduce the burden of all BSC systems receiving paging messages from switching, and ensure that all paging messages are sent out as soon as possible in a LAC area.

3. Whether the mobile phone is in the service area will directly affect whether the paging message sent by the system can be responded by the mobile phone. To ensure that the mobile phone is in the service area, the network coverage needs to meet certain requirements. Therefore, the soundness of the network will fundamentally restrict the improvement of the connection rate of the wireless system. The paging success rate reflects the coverage problem of the network, and the uplink and downlink access of the mobile phone can be adjusted. ACCMIN should be kept as low as possible, but the dropped call rate will increase. SEIMENS can also keep RACHBT； low.

4. reduce network interference (external interference, CDMA interference, jammers of some special organs and departments);

5. exchange and chase out the cells with no response to paging, and solve them pertinently;

6. In general, network congestion is the biggest factor that affects the connection rate of wireless systems. If the signaling channel is congested, the paging message may be lost, which directly affects the paging success rate. For example, the congestion of A-port signaling link, PCH congestion and SDCCH congestion will all lead to the decrease of paging success rate.

7. deal with hardware problems (RF unit, CDU, antenna feed system, etc.) that have great influence on transmission. When the cell signal is unstable, the paging success rate will be quite poor. In this way, it is necessary to use microwave transmission as little as possible.

8. Sometimes the outage will affect the paging success rate of the adjacent LAC.

9. Personal behaviors of users, such as sending short messages and multimedia messages. The paging mechanism of SMS center should also be concerned. We once encountered a case, because the paging retransmission times of the newly-built short message center were different from those of other short message centers, the paging success rate of the whole network dropped significantly.

1.PAGING channel planning, ensuring that the number of PAGING channels is suitable for the scale of the network, and sending the paging message sent by the exchange as soon as possible in time. Ccch_conf, bs_ag_blks_res and bs_pa_mfrms can be adjusted. It is required that the data of all base stations in a LAC area be unified.

11. Enable joint paging, so that GPRS users can also receive paging messages during data transmission.

12. Optimize the load of LAPD processing module during busy hours.

13. Check the connection between SCCP and MSC

14. If the uplink and downlink signals are unbalanced, the uplink or downlink signals may be poor, resulting in paging failure.

15. Mobile phone problem.