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In the inter-MSC handover , here devoted to introduce the sequence between different

MSC/VLR.

When the MSCA receives the Handover required from the oBSS, the MSCA finds that the new

cell belongs to the MSCB, then sends the

Prepare Handover

message to the MSCB. This requestmay optionally contain an indication that a handover number allocation is not required, target Cell

Id, for compatibility reasons, and all information required by MSCB to allocate the necessary

radio resources.


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Then the MSCB sends Allocate HandoverNo. Message to the VLRB.


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The VLRB responds with the message Send Handover Report which handover number is

included in.


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Then the MSCB transfers the handover number to the MSCA with the message Prepare

Handover Ack .


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The MSCB sends the acknowledgement to the VLRB. The handover number will be reserved until

a Send Handover Report confirmation is received from MSC-B.


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The MSCA then sends the message Initial Address Message tagged with handover number

allocated by VLRB. The MSCB sends the Address Complete Message and Answer to the

MSCA. The connection between the MSCA and MSCB has been established.


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Optionally MSC-A can receive, after a Prepare Handover confirmation, a Process Access

Signaling indication containing BSSAP information.

When the connection has been established between the MS and MSCB, MSCA will be informed

by a

Send End Signal

indication.If required, the MSCA requests the Forward Access Signaling request containing the

information to be transferred to the A-interface of MSCB (e.g. call control information).

The Forward Access Signaling is a non-confirmed service.

The Forward Access Signaling is composed in such a way that the information can be passed

transparently to the A-interface for call control and mobility management information.

Any response received in MSC-B from the A-interface that should be brought to MSC-A will

require a new independent request from the MSCB to the MSCA by invoking a Process Access

Signaling request.


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When the conversation is ended, the MSCA sends the Release message to the MSCB and

MSCB responds with the message Release Complete .

When MSCA wants to clear the connection with BSSB, and then sends the Send End Signal

response to MSCB to close the sequence.


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After the release of the resources for the call and handover, the inter-VLR location update

sequence is followed.


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