Method for seeking mobile station

Abstract

First, the method calculates borderline zones extended for each actual seeking location zone. When a MS is to be sought, according to extended seeking strategy setup in advance, BSC carried out seeking for location zone registered by MS as well as extended borderline zones corresponding to the location zone. The invention increases success ratio of seeking MS located at borderline zones of location zone. Since the said extended borderline zones are calculated by BSC according to certain algorithm based on information of free switchable neighbouring areas existed in BSC already. Thus, complexity of network planning is reduced; amount of message to be sought is lowered effectively. Advantages are: avoiding network burthen from quick rising so as to guarantee safety of system.

Description

technical field [0001] The invention relates to the technical field of Code Multiple Access (CDMA), in particular to a method for paging a mobile station (MS). Background technique [0002] In a CDMA system, a location area can be defined on the base station controller (BSC) and mobile switching center (MSC). The so-called location area is a collection of specific cells. The CDMA system usually uses registration to notify the mobile switching center's visitor location register (MSC / VLR) of the location area where a certain MS is currently located. The BSC is responsible for converting the paging message received from the MSC / VLR into an air interface message and distributing it to all cells under the location area. The implementation process of the prior art will be described in detail below. [0003] FIG. 1 is a schematic diagram of a paging scheme in the prior art 1. As shown in FIG. The network shown in Figure 1 is that MSC1 is connected to BSC1, BSC1 is connected to l...

AI Technical Summary

Problems solved by technology

[0004] The shortcoming of the prior art 1 is: the premise that the MS can be paged is that it must be in the cell under LAC1, if the MS is idle handover from the CELL1 under the LAC1 to the cell under the LAC2, due to the defects of the CDMA protocol IS95 and IS2000 series - There is no location area based registration, therefore, the MS will not initiate a location area based registration

[0011] The disadvantage of the above setting method is that if the wireless environment in the border area of ​​LAC1 and LAC2 is more complicated, the MS will frequently initiate REG_ZONE registration, which not only increases the load on the network side, but also consumes more power for the mobile phone. cannot be paged during

[0015] The defect of the above setting method is that although the location update is not as frequent as setting method 1, and it can also solve the problem that most mobile phones cannot be paged at the LAC border, but if the ZONE2 information recorded in ZONE_LISTs times out, the MS returns to ZONE2, because ZONE2 is still in ZONE_LISTs, according to the protocol, MS will not initiate registration again, and the information stored in MSC / VLR is the location area of ​​the cell corresponding to ZONE3, at this time, if the MS is called, paging will occur less than problem

[0017] The defect of the above scheme is that although the MS can be paged, the amount of paging issued by MSC1 is relatively large, and there are many invalid paging messages, which increases the CPU processing load of all BSCs under MSC1 and all base transceiver stations ( The load of the paging channel of BTS) will lead to the overload of the BSC under the MSC or the overload of the paging channel in severe cases

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