Content for TR 23.889 Word version: 10.0.0
13 Call Establishment and Handover Scenarios for selected Call Leg Correlation Method
14 Solutions for A Interface signalling and LCLS support
15 Proposed New Control Flags, Information Elements, Messages
16 Conclusions and Recommendations
A Impacts to Specifications
$ Change history
13 Call Establishment and Handover Scenarios for selected Call Leg Correlation Method p. 73
13.1 General p. 73
13.2 Call Establishment and LCLS negotiation solutions p. 73
13.2.1 Basic call establishment and LCLS negotiation solutions p. 73
13.2.2 Specific scenarios and analysis of call establishment and LCLS signalling for GCR plus mandatory support of BSS ID solution. p. 80
13.2.3 Specific scenarios and analysis of call establishment and LCLS signalling for GCR plus optional support of BSS ID solution p. 80
13.2.4 Specific scenarios and analysis of call establishment and LCLS signalling for GCR only solution p. 80
13.2.5 Call Flows During Call Establishment With Handover p. 80
13.2.5.1 Handover at oMSC prior to Assignment p. 80
13.2.5.1.1 Example of Handover at oMSC prior to Assignment p. 80
13.2.5.1.2 Handover at oMSC prior to Assignment with GCR Only p. 82
13.2.5.1.3 Inter-BSS Handover at Originating MSC prior to Assignment with BSS ID (alternative 2) p. 82
13.2.5.1.4 Differences between GCR Only and GCR plus BSS ID for handover occurring at Originating MSC prior to Assignment. p. 82
13.2.5.2 Handover at tMSC prior to Assignment p. 82
13.2.5.2.1 Example of Handover at tMSC prior to Assignment p. 82
13.2.5.2.2 Handover at tMSC prior to Assignment with GCR Only p. 84
13.2.5.2.3 Inter-BSS Handover at Terminating MSC prior to tAssignment with BSS ID (alternative 2) p. 84
13.2.5.2.4 Differences between GCR Only and GCR plus BSS ID for handover occurring at Terminating MSC prior to Assignment. p. 84
13.2.5.3 Handover at oMSC after Assignment (Call not local becomes Local) p. 84
13.2.5.3.1 Example of Handover at oMSC after Assignment (Call not local becomes Local) p. 84
13.2.5.3.2 Handover at oMSC after Assignment (Call not local becomes Local) with GCR Only p. 86
13.2.5.3.3 Differences between GCR Only and GCR plus BSS ID for handover occurring at oMSC after Terminating Assignment. p. 86
13.2.5.4 Inter-BSS Handover at Originating MSC after Assignment by Originating MSC (but prior to tAssignment) p. 86
13.2.5.5 Handover at oMSC after Assignment (Call which is Local becomes not local) p. 88
13.2.5.6 Inter-BSS Handover at Terminating MSC after Assignment by Terminating MSC p. 89
13.2.5.7 Simultaneous Handover at tMSC and oMSC during call establishment p. 90
13.2.5.8 Inter-BSS Handover during Call Establishment with optional BSS ID p. 91
13.2.5.9 Inter-MSC Handover at Originating MSC prior to Assignment p. 91
13.2.5.10 Inter-MSC Handover at Terminating MSC prior to Assignment p. 93
13.2.5.11 Inter-MSC Handover at Originating MSC after Assignment p. 96
13.2.5.12 Inter-MSC Handover at Terminating MSC after Assignment p. 99
13.3 Handover Scenarios p. 101
13.3.1 Basic handover solutions p. 101
13.3.1.1 Inter-BSS Handover when LCLS is broken p. 101
13.3.1.1.1 Inter-BSS Handover when LCLS is broken and CN User Plane is de-activated During LCLS p. 101
13.3.1.1.1.1 Connection Model p. 101
13.3.1.1.1.2 Basic Sequence for inter-BSS Handover that breaks LCLS and CN User Plane is de-activated during LCLS p. 104
13.3.1.1.1.3 Pros and Cons of Intra-BSS Handover with BSS informing CN when LCLS is broken p. 106
13.3.1.1.2 Inter-BSS Handover with CN determining when LCLS is broken p. 106
13.3.1.1.2.1 Connection Model p. 106
13.3.1.1.2.2 Basic Sequence p. 106
13.3.1.1.2.3 Pros and Cons of Intra-BSS Handover with BSS informing CN when LCLS is broken p. 107
13.3.1.1.3 Inter-BSS Handover when LCLS is broken if user plane active p. 107
13.3.1.1.3.1 Connection model p. 107
13.3.1.1.3.2 Basic Sequence p. 111
13.3.1.1.4 Conclusions on Inter-BSS Handover that breaks Local Switching p. 112
13.3.1.2 Inter-BSS Handover that establishes Local Switching p. 112
13.3.1.2.1 Connection Model p. 112
13.3.1.2.2 Basic Sequence p. 114
13.3.1.3 Inter-BSS Handover that leaves a not Locally Switched Call unchanged p. 115
13.3.1.3.1 Basic Sequence p. 115
13.3.1.4 Inter-MSC Handover that establishes Local Switching p. 116
13.3.1.4.1 Connection Model p. 116
13.3.1.4.2 Basic Sequence p. 119
13.3.1.5 Inter-MSC Handover that terminates Local Switching p. 123
13.3.1.5.1 - p. 123
13.3.1.5.1.1 Connection Model p. 123
13.3.1.5.1.2 Basic Sequence p. 127
13.3.1.5.2 Inter-MSC Handover that terminates Local Switching when user plane deactivated p. 129
13.3.1.6 Inter-MSC Handover that leaves a not Locally Switched Call unchanged p. 129
13.3.1.7 Failed handover with the GCR with encapsulated oBSS ID based solution p. 129
13.3.1.8 Failing handover that would have broken a LCLS call p. 129
13.3.1.9 Failing handover that would have established a call within one BSS p. 129
13.3.2 Specific handover scenarios and analysis of GCR plus mandatory support of BSS ID solution p. 130
13.3.3 Specific handover scenarios and analysis of GCR plus optional support of BSS ID solution p. 130
13.3.4 Handover Sequences for GCR Method p. 130
13.3.5 Simultaneous Handovers p. 130
13.3.5.1 General p. 130
13.3.5.2 Inter-BSS Simultaneous Handover that Maintains LCLS (Early detection) p. 130
13.3.5.2.1 Connection for Model for Simultaneous Handover that maintains LCLS (CN UP de-activated during LCLS) p. 130
13.3.5.2.2 Simultaneous Inter-BSS Handover when LCLS is maintained (CN UP de-activated during LCLS) p. 135
13.3.5.2.3 Simultaneous Inter-BSS Handover when LCLS is maintained (CN UP de-activated during LCLS) - GCR + BSS ID mandatory p. 137
13.3.5.2.4 Simultaneous Inter-BSS Handover when LCLS is maintained (CN UP de-activated during LCLS) - GCR + BSS ID optional p. 137
13.3.5.3 Inter-BSS Simultaneous Handover that Maintains LCLS (Late Detection) p. 138
13.3.5.3.1 Connection for Model for Simultaneous Handover that maintains LCLS p. 138
13.3.5.3.2 Simultaneous Inter-BSS Handover when LCLS is maintained - GCR + BSS ID mandatory (Late Detection) p. 139
13.3.5.3.3 Simultaneous Inter-BSS Handover when LCLS is maintained - GCR + BSS ID optional p. 139
13.3.5.4 Inter-BSS Simultaneous Handover that Breaks LCLS (Early Detection) p. 140
13.3.5.4.1 Connection for Model for Simultaneous Handover that breaks LCLS (CN UP de-activated during LCLS) p. 140
13.3.5.4.2 Simultaneous Inter-BSS Handover that breaks LCLS (CN UP de-activated during LCLS) p. 141
13.3.5.4.3 Simultaneous Inter-BSS Handover that breaks LCLS (CN UP de-activated during LCLS) - GCR plus BSS ID mandatory p. 142
13.3.5.4.4 Simultaneous Inter-BSS Handover that breaks LCLS (CN UP de-activated during LCLS) - GCR + BSS ID optional p. 143
13.3.5.5 Inter-BSS Simultaneous Handover that Breaks LCLS (Late Detection) p. 144
13.3.5.5.1 Connection for Model for Simultaneous Handover that breaks LCLS p. 144
13.3.5.5.2 Simultaneous Inter-BSS Handover that breaks LCLS - GCR plus BSS ID mandatory p. 145
13.3.5.5.3 Simultaneous Inter-BSS Handover that breaks LCLS - GCR plus BSS ID optional p. 145
13.3.5.6 Simultaneous Inter-MSC Handover that Maintains LCLS (Early Detection) p. 145
13.3.5.6.1 Simultaneous Inter-MSC Handover when LCLS is maintained (CN UP de-activated during LCLS) p. 145
13.3.5.6.2 Simultaneous Inter-MSC Handover when LCLS is maintained (CN UP de-activated during LCLS) - GCR + BSS ID mandatory p. 145
13.3.5.6.3 Simultaneous Inter-MSC Handover when LCLS is maintained (CN UP de-activated during LCLS) - GCR + BSS ID optional p. 145
13.3.5.7 Inter-MSC Simultaneous Handover that Maintains LCLS (Late Detection) p. 145
13.3.5.8 Inter-MSC Simultaneous Handover that Breaks LCLS (Late Detection) p. 145
13.4 Comparison and conclusions on Call Establishment and Handover Scenarios p. 147
13.5 Signalling Sequences for MSC-S Judged Method p. 147
14 Solutions for A Interface signalling and LCLS support p. 147
14.1 General p. 147
14.2 Signalling of Local Switching Capability from BSS to CN p. 148
14.2.1 General Considerations p. 148
14.2.2 LCLS Capability Solution using O&M Configuration p. 148
14.2.2.1 Technical Description p. 148
14.2.2.2 Pros and Cons LCLS Capability Solution using O&M p. 148
14.2.3 LCLS Capability Solution Signalling LCLS Capability in Assignment Complete p. 148
14.2.3.1 Technical Description p. 148
14.2.3.2 Pros and Cons for LCLS Capability Solution using Assignment Complete p. 148
14.2.4 LCLS Capability Solution Signalling LCLS Capability in "Complete Layer 3" message p. 149
14.2.4.1 Technical Description p. 149
14.2.4.2 Pros and Cons for LCLS Capability Solution using Complete Layer 3 message p. 149
14.2.5 Comparison of Solutions for Signalling of Local Switching Capability from BSS to CN p. 149
14.3 Signalling of Local Switching Configuration from CN to BSS p. 150
14.3.1 General Considerations p. 150
14.3.2 LCLS Configuration Solution by signalling of LCLS-Configuration in Assignment/Handover procedures p. 150
14.3.2.1 Technical Description p. 150
14.3.2.2 Pros and Cons for LCLS Configuration Solution using Assignment and Handover Request p. 150
14.3.3 Comparison of Solutions for Signalling of Local Switching Preference from CN to BSS p. 150
14.4 Signalling of the correlation of the call legs from CN to BSS p. 151
14.4.1 General Considerations p. 151
14.4.2 Correlation Solution by signalling of GCR in Assignment/Handover procedures (CN to BSS) p. 151
14.4.2.1 Technical Description p. 151
14.4.2.2 Pros and Cons for Correlation Solution using GCR p. 151
14.4.3 Correlation (CN to BSS) Solution by signalling of Call-Leg Information parameter in Assignment/Handover Procedures p. 151
14.4.4 Correlation (CN to BSS) Solution by signalling of existing call reference parameter Call ID/CIC & MSC ID in Assignment/Handover procedures p. 152
14.4.4.1 Technical Description p. 152
14.4.4.2 Pros and Cons for Correlation (CN to BSS) Solution using Call ID plus CIC & MSC Id p. 152
14.4.5 Comparison of Solutions for signalling the correlation of call legs from CN to BSS p. 152
14.5 Signalling of Local Switching Status from BSS to CN p. 153
14.5.1 General Considerations p. 153
14.5.2 LCLS Status Solution by signalling Local Switching Status in new message and in Assignment/Handover procedures p. 153
14.5.2.1 Technical Description p. 153
14.5.2.2 Pros and Cons for LCLS Status Solution as new IE in new message and existing messages p. 153
14.5.3 Comparison of Solutions for Signalling of Local Switching Status from BSS to CN p. 153
14.6 Signalling of Local Switching user plane Connection Control from CN to BSS p. 154
14.6.1 General Considerations p. 154
14.6.2 LCLS Connection Control Solution using new "LCLS-CONNECTION_CONTROL" message and IE to BSS p. 154
14.6.2.1 Technical Description p. 154
14.6.2.2 Pros and Cons for LCLS Connect Control Solution p. 154
14.6.3 Comparison of Solutions for Signalling of Local Switching User Plane Connection Control/Enabled from CN to BSS p. 154
14.7 Signalling of Local Switching Disabled from CN to BSS p. 155
14.7.1 General Considerations p. 155
14.7.2 LCLS Disabled Solution using new LCLS-Disconnect message to BSS p. 155
14.7.2.1 Technical Description p. 155
14.7.2.2 Pros and Cons for LCLS Disabled Solution using new message p. 155
14.7.3 LCLS Disabled Solution using LCLS-Connection-Status-Control IE within LCLS-CONNECT_CONTROL Message to BSS p. 155
14.7.3.1 Technical Description p. 155
14.7.3.2 Pros and Cons for LCLS Disabled Solution using LCLS-CONNECT p. 155
14.7.4 Comparison of Solutions for Signalling of Local Switching Disabled from CN to BSS p. 156
14.8 Request to Control Call Leg Correlation p. 156
15 Proposed New Control Flags, Information Elements, Messages p. 157
15.1 Core Network Interfaces p. 157
15.2 Radio Access Interfaces p. 159
16 Conclusions and Recommendations p. 160
A Impacts to Specifications p. 161
$ Change history p. 162
