Content for TS 23.205 Word version: 17.0.0
8.4 GSM to GSM
8.4.1 Intra-MSC Inter-BSS GSM to GSM Handover
8.4.2 Basic Inter-MSC GSM to GSM Handover
8.4.3 Subsequent Inter-MSC GSM to GSM Handover back to the Anchor MSC
8.4.4 Subsequent GSM to GSM Handover to a third MSC
8.4.5 BSS Internal Handover
8.5 Handling of GSM Services after UMTS to GSM Handover
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8.4 GSM to GSM p. 109
8.4.1 Intra-MSC Inter-BSS GSM to GSM Handover p. 109
8.4.1.1 Handover Required |R5| p. 109
8.4.1.2 Handover Request Acknowledge |R5| p. 110
8.4.1.3 Handover Command/Handover Detect |R5| p. 110
8.4.1.4 Handover Complete |R5| p. 110
8.4.1.5 Interworking function |R5| p. 110
8.4.1.6 Voice Processing function |R5| p. 110
8.4.1.7 Failure Handling in MSC server |R5| p. 110
8.4.1.8 Example |R5| p. 111
8.4.1.9 Intra-MSC GSM to GSM Handover for A interface over IP |R8| p. 113
8.4.2 Basic Inter-MSC GSM to GSM Handover p. 114
8.4.2.1 MSC-A / MGW-A p. 114
8.4.2.1.1 Bearer establishment between MGW-A and MGW-B |R5| p. 114
8.4.2.1.2 Handover Command/Handover Detect |R5| p. 114
8.4.2.1.3 Handover Complete |R5| p. 115
8.4.2.1.4 Interworking function |R5| p. 115
8.4.2.1.5 Voice Processing function |R5| p. 115
8.4.2.1.6 Failure Handling in MSC server |R5| p. 115
8.4.2.2 MSC-B / MGW-B p. 115
8.4.2.2.1 MGW selection |R5| p. 115
8.4.2.2.2 Bearer establishment towards BSC-B |R5| p. 115
8.4.2.2.3 Bearer establishment between MGW-A and MGW-B |R5| p. 115
8.4.2.2.4 Voice Processing function |R5| p. 115
8.4.2.2.5 Failure Handling in MSC server |R5| p. 115
8.4.2.2.6 Example |R5| p. 115
8.4.2.3 Basic Inter-MSC GSM to GSM Handover for A Interface over IP |R8| p. 118
8.4.3 Subsequent Inter-MSC GSM to GSM Handover back to the Anchor MSC p. 119
8.4.3.1 MSC-A / MGW-A p. 119
8.4.3.1.1 Handover Request Acknowledge |R5| p. 119
8.4.3.1.2 Handover Command/Handover Detect |R5| p. 120
8.4.3.1.3 Handover Complete |R5| p. 120
8.4.3.1.4 Interworking function |R5| p. 120
8.4.3.1.5 Voice Processing function |R5| p. 120
8.4.3.1.6 Failure Handling in MSC server |R5| p. 120
8.4.3.2 MSC-B/MGW-B p. 120
8.4.3.2.1 Handover Complete |R5| p. 120
8.4.3.2.2 Release of bearer towards MGW-A |R5| p. 120
8.4.3.2.3 Example |R5| p. 120
8.4.3.3 Subsequent Inter-MSC GSM to GSM Handover back to the anchor MSC for A Interface over IP |R8| p. 124
8.4.4 Subsequent GSM to GSM Handover to a third MSC p. 124
8.4.5 BSS Internal Handover |R8| p. 125
8.4.5.1 Introduction p. 125
8.4.5.2 Internal Handover Required p. 125
8.4.5.3 Internal Handover Command/Handover Detect p. 125
8.4.5.4 Handover Complete p. 125
8.4.5.5 Interworking function p. 125
8.4.5.6 Voice Processing function p. 125
8.4.5.7 Failure Handling in MSC server p. 125
8.4.5.8 Example for a successful BSS Internal Handover p. 126
8.5 Handling of GSM Services after UMTS to GSM Handover p. 128
