A method for inter-office hard handover when there are multiple identities in a mobile switching center

Abstract

The invention discloses a method for inter-office hard handover under the identification of multiple mobile switching centers, comprising steps: a: The source-side BSC detects that a mobile station has an inter-office handover, and sends a handover request message carrying a target MSCID and a target CELLID to the source-side MSC , the source-side MSC sends an inter-office handover request message to the target MSC according to the target MSCID and target CELLID; b: The target MSC receives the handover request message from the source-side MSC, and finally determines that the target BSC completes the office switch according to the target MSCID and target CELLID information in the message. switch between. The present invention expands the current MAP protocol and adds the target MSCID parameter in the inter-office handover message to realize the inter-office hard handover under the condition that the CELLID is not unique when there are multiple MSCIDs, so that the mobile station can move back and forth in a more complicated environment. The ongoing business is not interrupted, the stability of the system is improved, and the use of users is expanded.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to an interoffice hard handoff method under the condition that multiple MSCIDs (mobile switching center identifiers) exist in a single mobile switching center in a wireless communication network and the CELLID (cell identifier) ​​is not unique. Background technique [0002] In CDMA (Code division multiple access, code division multiple access) wireless communication network, the area covered by some MSC (Mobile switching center, mobile switching center) will be divided into multiple VMSC (virtual Mobile switching center, virtual mobile switching center), and each VMSC is assigned a different MSCID, and the CELLID covered by each VMSC is not unique. When a mobile user performs various services in these critical areas, due to the problem that the radio signals of the base stations under different MSCs are sometimes strong and sometimes weak, the mobile terminal will be handed off...

AI Technical Summary

Problems solved by technology

In the current CDMA wireless communication network, when the source base station detects that an inter-office hard handover has occurred in the mobile station, the source BSC sends a handover request message to the source MSC that carries the MSCID and target CellID information of the target MSC. The information determines which target MSC the mobile station is handed over to. After receiving the inter-office hard handover request message from the source MSC, the target MSC judges which BSC to send the handover request to according to the target CELLID. If the CELLID of the target MSC is not unique, it will not be correct. To find the target BSC, the relevant information of the target MSCID must be obtained at the same time, and the target BSC is jointly determined by the target MSCID and the target CELLID, but this has not been realized in the prior art

[0004] The inter-office handover message is controlled by the MAP (Mobile application part, mobile application part) protocol, and the FACDIR2 (device indication message) message of the forward handover (forward handover refers to the mobile terminal switching from one office to another) For example, the message body only contains the tTargCellID parameter to pass the target CELLID, and does not contain the MSCID parameter to pass the target MSCID from the source MSC to the target MSC. In this way, when the target MSC has multiple MSCIDs and the CELLID is not unique, it will cause Switching between offices failed

[0005] Therefore, in the prior art, when an MSC has multiple MSCIDs and the CELLID is not unique, the target MSC cannot uniquely locate the target BSC only based on the CELLID information in the handover request message of the source MSC.

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