Content for TR 23.889 Word version: 10.0.0
4 Requirements and Architecture
5 Working Assumptions
6 Call Setup and Call Clearing Scenarios
7 General Handover Principles
8 Solutions for CN signalling and LCLS support
9 Call Leg Correlation Methods
10 Impacts to Supplementary Services and Existing Features
11 Lawful Interception Requirements and Solutions
12 Solutions for User Plane handling
4 Requirements and Architecture p. 13
5 Working Assumptions p. 14
5.1 GERAN Assumptions p. 14
5.2 Core Network Assumptions p. 15
6 Call Setup and Call Clearing Scenarios p. 16
6.1 Local Mobile-to-Mobile call within same PLMN; one MSC-Server p. 16
6.2 Local Mobile-to-Mobile call within same PLMN; two MSC-Servers p. 16
6.2.1 Legacy Setup of a Mobile-to-Mobile call with two MSC-S's p. 16
6.2.2 Local Switching in Mobile-to-Mobile call with two MSC-S's p. 19
6.3 Local Switching in Mobile-to-Mobile call with more than two MSC-Server's p. 20
6.4 Late Assignment in Mobile-to-Mobile Call Setup with two MSC-S's p. 21
6.5 Call Clearing scenarios p. 22
7 General Handover Principles p. 23
7.0 General p. 23
7.1 Local Handover with Compatible Codec p. 23
7.2 Local Handover to Incompatible Codec p. 24
7.2.1 Local Handover to Incompatible Codec: General Considerations p. 24
7.2.2 Local Handover to Incompatible Codec with LCLS interrupted p. 25
7.2.2.1 Technical Description of Local Handover Solution with LCLS interrupted p. 25
7.2.2.2 Pros and Cons of Local Handover Solution with LCLS interrupted p. 25
7.2.3 Local Handover to Incompatible Codec with Transcoding in BSS p. 25
7.2.3.1 Technical Description of Local Handover with Transcoding in BSS p. 25
7.2.3.2 Pros and Cons of Local Handover Solution with transcoding in BSS p. 25
7.2.4 Local Handover to Incompatible Codec by asynchronous Double Handover p. 26
7.2.4.1 Technical Description of Local Handover Solution by asynchronous double handover p. 26
7.2.4.2 Pros and Cons of Local Handover Solution by asynchronous double handover p. 26
7.2.5 Local Handover to Incompatible Codec by synchronous Double Handover p. 26
7.2.5.1 Technical Description of Local Handover Solution by synchronous double handover p. 26
7.2.5.2 Pros and Cons of Local Handover Solution by synchronous double handover p. 27
7.2.6 Conclusion regarding handover to incompatible codecs p. 27
7.3 General descriptions of Inter-BSS Handovers with LCLS p. 27
7.3.1 Inter-BSS Handovers and LCLS that terminates Local Call p. 27
7.3.2 Inter-BSS Handover that establishes Local Call p. 28
7.3.3 Inter-BSS Handover that leaves Local Switching unchanged p. 28
7.4 Inter-MSC Handover Scenarios p. 29
7.4.1 General Considerations p. 29
7.4.2 Inter-MSC Handover that leaves a not Locally Switched Call unchanged p. 29
7.5 LCLS handling when a handover failed p. 29
7.5.1 General p. 29
8 Solutions for CN signalling and LCLS support p. 29
8.1 General p. 29
8.2 Local Switching Negotiation within the CN p. 29
8.2.1 General Considerations p. 29
8.2.2 LCLS Negotiation within CN: Solution without CN signalling p. 30
8.2.2.1 Technical Description for LCLS without CN signalling p. 30
8.2.2.2 Pros and Cons for LCLS Negotiation without CN signalling p. 30
8.2.3 LCLS Negotiation CN Solution Signalling between oMSC-Server and tMSC-Server p. 30
8.2.3.1 Technical Description for LCLS-Signalling between MSC-Servers p. 30
8.2.3.2 Pros and Cons LCLS Negotiation within CN Solution p. 33
8.2.4 LCLS Signalling within CN Solution with only LCLS allowed signalling between oMSC-S and tMSC-S p. 33
8.2.4.1 Technical Description p. 33
8.2.4.2 Pros and Cons LCLS Negotiation within CN Solution with only LCLS allowed indications p. 33
8.2.5 Comparison of Solution for Local Switching Negotiation within CN p. 33
8.3 LCLS-Notification to MGW's p. 33
9 Call Leg Correlation Methods p. 34
9.1 General Considerations p. 34
9.2 Correlation ID Solution where MSC-Servers inform RAN with Unique Call Identifier (GCR) p. 34
9.2.1 Technical Description p. 34
9.2.2 Possible options to reduce BSS processing for call leg correlations p. 35
9.2.3 Pros and Cons of Correlation ID Solution using GCR p. 39
9.3 Correlation ID Solution where MSC-Ss exchange unique BSS ID and Call-Leg p. 40
9.4 Correlation ID Solution where MSC-Ss exchange unique RAN-Identifiers and oCall-leg information p. 40
9.5 Correlation ID Solution using Call ID/CIC & "MSC ID" p. 40
9.6 Correlation Solution using GCR + Mandatory BSS ID Support p. 40
9.7 Correlation Solution using GCR + Optional BSS ID Support p. 40
9.8 Conclusion of Solution for Correlation of Call Legs p. 40
10 Impacts to Supplementary Services and Existing Features p. 40
10.1 Tandem free operation, TFO p. 40
10.2 CS data call p. 41
10.3 Alternate Speech/Fax p. 41
10.4 GSM Fax p. 41
10.5 Announcements and Tones p. 41
10.5.1 Announcements and Tones during Call Setup p. 41
10.5.1.1 General p. 41
10.5.1.2 Announcements and Tones Solution using Early Provisioning of the User Plane p. 41
10.5.1.2.1 Technical Description of AT-Solution using Early Provisioning p. 41
10.5.1.2.2 Pros and Cons for Announcements and Tones Solution using Early Provisioning p. 41
10.5.1.3 Announcements and Tones Solution using LCLS Negotiation to determine whether User Plane is required p. 42
10.5.1.3.1 Technical Description of AT-Solution using LCLS Negotiation p. 42
10.5.1.3.2 Pros and Cons for Announcements and Tones Solution using LCLS Negotiation p. 43
10.5.1.4 Comparison of Solutions for Announcements and Tones during Call Setup p. 43
10.5.2 Mid-Call Announcements/Tones p. 44
10.5.2.1 General p. 44
10.5.2.2 Mid-call announcement solution using Signalling to indicate start of announcement p. 44
10.5.2.3 Mid-call announcement solution using Announcement and tone detection in the BSS p. 45
10.5.2.4 Mid-call announcement solution where LCLS is not allowed if the subscribed service might cause mid-call announcements p. 47
10.5.2.5 Mid-call announcement solution: Inband tone between MGWs to indicate the start and stop of announcements/tones p. 47
10.5.2.6 Mid-call announcement solution when the user plane is de-activated in the core network during LCLS p. 49
10.5.2.7 Mid-call announcement solution: Break of LCLS before start of announcement/tone p. 52
10.5.2.8 Mid-call announcement solution using Out of Band control signalling for the intercepted LCLS calls p. 55
10.5.2.8.1 General Information p. 55
10.5.2.8.2 Mid-Call Announcement for intercepted LCLS call, when BSS ceased bi-casting p. 56
10.5.2.8.3 Mid-Call Announcement for intercepted LCLS call, when CN User plane is de-activated p. 59
10.5.2.9 Conclusion on Mid-call announcements and tones p. 60
10.6 DTMF in from MS to Network in an MS-to-MS call p. 60
10.7 Enhanced Multi-Level Precedence and Pre-emption service (eMLPP) p. 60
10.8 Call Deflection Service p. 60
10.9 Calling Line Identification Presentation (CLIP) Calling Line Identification Restriction (CLIR) Connected Line Identification Presentation (COLP) Connected Line Identification Restriction (COLR) p. 60
10.10 Call Forwarding Services Call Forwarding Unconditional (CFU) Call Forwarding on mobile subscriber Busy (CFB) Call Forwarding on No Reply (CFNRy) Call Forwarding on mobile subscriber Not Reachable (CFNRc), Call forwarding after user determined user busy (UDUB) p. 60
10.11 Call Waiting (CW) p. 61
10.12 Call Hold (CH) p. 64
10.13 Multiparty (MPTY) p. 64
10.14 Closed User Group (CUG) p. 64
10.15 Advice of Charge (AoC) p. 64
10.16 User-to-User Signalling (UUS) p. 64
10.17 Call Barring Services p. 64
10.18 Explicit Call Transfer (ECT) p. 64
10.19 Completion of Calls to Busy Subscriber (CCBS) p. 64
10.20 Multicall p. 64
10.21 Calling Name Presentation (CNAP) p. 64
10.22 Voice group call service (VGCS), Voice broadcast service (VBS) p. 64
10.23 Emergency Calls p. 65
10.24 RTP Multiplexing p. 65
10.25 Customised Alerting Tone (CAT) p. 65
10.26 CAMEL p. 65
10.27 IMS Centralized Services (ICS) p. 65
11 Lawful Interception Requirements and Solutions p. 65
11.1 General p. 65
11.2 LI-Solution by Restriction of LCLS by LI p. 65
11.3 LI-Solution to bi-cast user plane data for LCLS calls p. 66
11.4 Comparison of Solutions for LCLS considering LI p. 68
12 Solutions for User Plane handling p. 68
12.1 General p. 68
12.2 A-interface and CN UP Handling Solution by not releasing A-interface and core network resources during LCLS p. 69
12.2.1 Technical Description for not releasing CN-resources by providing SID frames p. 69
12.2.2 Technical Description for not releasing A-interface and CN-resources with no data on user plane p. 70
12.3 Solution by releasing A-Interface and CN resources during LCLS p. 71
12.3.1 General for releasing A-interface and CN-resources p. 71
12.3.2 Technical Description for releasing A-interface and CN-resources p. 71
12.4 User plane handling in Inter-BSS and Inter-MSC handovers of LCLS related calls p. 72
12.5 Comparison of Solutions for A-interface and CN User Plane handling p. 72
12.6 Conclusion of Solutions for A-interface and CN User Plane handling p. 73
