The location update flow is as follows:
- When a MS finds that better service is provided in a certain location area, this MS notifies the MSC of the MSC/VLR which this new location area belongs to.
- If the original location area and new location area belong to the same MSC/VLR, the MSC only changes the location information of this MS in the VLR. If the original location area and new location area belong to different MSCs/VLRs, the new MSC/VLR requests the data of this MS from the HLR.
- The HLR returns the information needed by the new MSC/VLR and at the same time notifies the original MSC/VLR to delete the original registration information of this MS and notifies the new MSC/VLR to register this MS.
Location Update of MS in the Same VLR
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