459_handover
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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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