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GSM 09.02 - Version 5.3.0 - Digital cellular telecommunications - ETSI

GSM 09.02 - Version 5.3.0 - Digital cellular telecommunications - ETSI

GSM 09.02 - Version 5.3.0 - Digital cellular telecommunications - ETSI

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Page 336<br />

<strong>GSM</strong> <strong>09.02</strong> <strong>Version</strong> <strong>5.3.0</strong>: August 1996<br />

Call<br />

on<br />

MSC-B<br />

NULL<br />

Wait_for<br />

SUB_HO_<br />

Indication<br />

HO_CA_MESSAGE_ind,<br />

see NOTE 1,<br />

[Close connection]<br />

MAP_SEND_END_<br />

SIGNAL_rsp<br />

MAP_CLOSE-req<br />

HO_CA_MESSAGE_req,<br />

see NOTE 1,<br />

[Request for HO]<br />

Subsequent HO<br />

to a third<br />

MSC required<br />

no<br />

Check_<br />

indication<br />

MSC<br />

known<br />

Ok<br />

yes<br />

Target MSC<br />

= MSC-A<br />

yes<br />

Wait_for<br />

HO_Indication<br />

MAP_PREPARE_SUBSEQUENT<br />

HANDOVER_ind<br />

See section 21.2<br />

no<br />

Subsequent HO<br />

back to MSC-A<br />

User Error =<br />

Unkown MSC<br />

HO_CA_MESSAGE_req,<br />

see NOTE 1,<br />

[Request for HO]<br />

Wait_for_<br />

HO_NUMBER<br />

from MSC-B<br />

Call<br />

on<br />

MSC-B<br />

Figure 16.2.2/1 (sheet 4 of 12): Process MSC_A_HO<br />

Error<br />

HO_CA_MESSAGE_ind,<br />

see NOTE 1,<br />

[Handover Number request]<br />

MAP_PREPARE_<br />

HANDOVER_req<br />

MAP_DELIMITER_req<br />

MAP_PREPARE_<br />

SUBSEQUENT_<br />

HANDOVER_rsp<br />

MAP_DELIMITER_req

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