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In cellular networks, handoffs occur when mobile stations are moved from one location to another location. If a mobile user moves from a base station associated with a MSC (old MSC) to another base station associated with different MSC (new MSC), then the handoff is called inter-MSC.

Consider a scenario where a mobile user attached to a base station associated with a MSC (old MSC) receives a call from correspondent.

• After receiving the call, the mobile user moved to another base station associated with different MSC (new MSC).

• Then the old MSC is called anchor MSC. This Anchor MSC is not changed until the call ends.

• Throughout the call duration, even though the mobile user handoff further to different MSCs, the call is routed to mobile user in two steps.

• In the first step, the call is routed from home MSC to the anchor MSC and in the second step, the call is routed from the anchor MSC to new visited MSC.

Therefore, the main role of anchor MSC is to maintain stable call connection, even though the mobile handoff to different MSCs.


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