2G Strategy Network Implementation PS Paging Layering 20131217

HUAWEI TECHNOLOGIES CO., LTD.

2G Strategy ActivitiesNetwork Implementation: PS Paging layering

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HISILICON SEMICONDUCTORHUAWEI TECHNOLOGIES CO., LTD. Page 2

With the rapid development of PS services in recent years, PS paging messages have accounted for an increasingly larger proportion of paging messages than circuit switched (CS) paging messages. This leads to heavy traffic load on the CCCHs and reduces the success rate of CS service admission.

PS paging messages are sent on the basis of routing areas (RAs). In live networks, however, users processing packet services do not cross a large area. In this case, paging resources are wasted. To save paging resources, Huawei introduces the Layered Paging feature. This feature enables the BSC to send paging messages to the last cell that an active PS MS camps on and to its neighboring cells. The BSC initiates the second paging by RAs if the first paging fails. PS paging does not affect user experience even though they may be delayed for a certain period.

Feature Description:

PS Layered Paging

Related Parameters:

Parameter Old Value New Value

READYTIMER 44s (should be same with SGSN) 44s (should be same with SGSN)

PSPagingCtrl ALWAYSNORMALPAGING FIRSTPRECISEPAGING


PS Layered Paging

Value of the Ready timer. Based on the Ready timer, the BSC checks whether a PS paging is a second one. If it is a second paging, the BSC sends paging messages to specific paging areas as required by the CN. Note that the value of the Ready timer must be the same for the BSC and SGSN.

• READYTIMER

Policy of transmitting PS paging messages to a cell. When the parameter is set to ALWAYSNORMALPAGING, the BSC sends PS paging messages to the paging areas specified by the CN. When the parameter is set to FIRSTPRECISEPAGING, PS paging messages in the first paging for an active PS user are sent only to the last cell on which the user camps and to its configured neighboring cells. If the first paging fails, the BSC sends PS paging messages to the paging areas specified by the CN after the CN has decided to allow the BSC to send the messages again. When the parameter is set to ALWAYSPRECISEPAGING, PS paging messages for an active PS user are sent to the last cell on which the user camps and to its configured neighboring cells.

• PSPagingCtrl


Layered Paging Trial at NPI CJ

Objective :This feature narrows down the paging areas for packet switched (PS) services. This helps lighten the CCCH load of the GSM network. For the first paging, the BSC sends paging messages to the last cell on which the MS camps and to its neighboring cells. If the first paging fails, the BSC sends paging messages to the areas specified by the SGSN for the second paging.

Action Taken:

Trial this feature under BSC Gombel1 & BSC Johar1

BSC Name READYTIMERGombel1 44

Johar1 44


Performance BSC Gombel1 & BSC Johar1

5


Performance BSC Gombel1 & BSC Johar1

6


Trial Result at Jogja


Trial Result at Jogja

8

PS delivered paging of most LAC reduced after change PSPagingCtrl.

Orange line: Enabled date. Red rectangle: Compare same week.

Result at Jogja:• PS delivered Paging of all LAC reduced• BSC UGM downlink TBF establish success rate maintained

due to some cells PDCH channel disabled,have already fixed.• Uplink TBF establisth Success/ TBF completion Success rate

maintained


Layered Paging trial of Jogja

9

Because BSC UGM and KotaGede have unactivated the counter:LA301:Number of Location Update Requests (Periodic Location Update),can’t provide the performance before and after.

Periodic Location Update of BSC Kentungan reduced after audit


Documents

2G Strategy Network Implementation PS Paging Layering 20131217