ETSI TS 123 284 V10.5.0 (2013-01)

Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Local Call Local Switch (LCLS); Stage 2 (3GPP TS 23.284 version 10.5.0 Release 10)

RTS/TSGC-0423284va50

General Information

• Status: Published
• Publication Date: 15-Jan-2013
• Technical Committee: 3GPP CT 4 - MAP/CAMEL/GTP/BCH/SS/TrFO/IMS/GUP/WLAN (formely CN4)
• Current Stage: 12 - Completion
• Due Date: 02-Jan-2013
• Completion Date: 16-Jan-2013

Standards Content (Sample)

Technical Specification
Digital cellular telecommunications system (Phase 2+);
Universal Mobile Telecommunications System (UMTS);
Local Call Local Switch (LCLS);
Stage 2
(3GPP TS 23.284 version 10.5.0 Release 10)

R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
3GPP TS 23.284 version 10.5.0 Release 10 1 ETSI TS 123 284 V10.5.0 (2013-01)

Reference
RTS/TSGC-0423284va50
Keywords
GSM,UMTS
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: [phone]  Fax: [phone]

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
Individual copies of the present document can be downloaded from:
http://www.etsi.org
The present document may be made available in more than one electronic version or in print. In any case of existing or
perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF).
In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive
within ETSI Secretariat.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
http://portal.etsi.org/tb/status/status.asp
If you find errors in the present document, please send your comment to one of the following services:
http://portal.etsi.org/chaircor/ETSI_support.asp
Copyright Notification
No part may be reproduced except as authorized by written permission.
The copyright and the foregoing restriction extend to reproduction in all media.

© European Telecommunications Standards Institute 2013.
All rights reserved.
TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI
3GPP TS 23.284 version 10.5.0 Release 10 2 ETSI TS 123 284 V10.5.0 (2013-01)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://ipr.etsi.org).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
http://webapp.etsi.org/key/queryform.asp.
ETSI
3GPP TS 23.284 version 10.5.0 Release 10 3 ETSI TS 123 284 V10.5.0 (2013-01)
Contents
Intellectual Property Rights . 2
Foreword . 2
Foreword . 11
1 Scope . 12
2 References . 12
3 Definitions, symbols and abbreviations . 13
3.1 Definitions . 13
3.2 Symbols . 13
3.3 Abbreviations . 13
4 Main Concepts . 13
4.1 General . 13
4.2 LCLS Negotiation . 14
4.2.1 General concept of LCLS negotiation . 14
4.2.2 (void) . 17
4.2.3 (void) . 17
4.2.4 General concept of LCLS Configuration Preference Modification . 17
4.3 LCLS Call Leg Correlation . 19
4.3.1 General . 19
4.3.2 Optional Intra-Network Call Detection. 19
4.3.2.1 General . 19
4.3.2.2 Intra-Network Call Detection within the tMSC server . 19
4.3.2.3 Intra-Network Call Detection within the tBSS . 20
4.3.3 Optional Intra-BSS Call Detection . 20
4.3.3.1 General . 20
4.3.3.2 Intra-BSS Call Detection within the tMSC server . 20
4.3.3.3 Intra-BSS Call Detection within the tBSS . 21
4.4 LCLS Connection Control . 21
4.5 LCLS Status Reporting . 21
4.5.1 LCLS BSS Status between BSS and Core Network . 21
4.5.2 LCLS Status within the Core Network . 22
4.6 User Plane when LCLS is Active . 23
4.6.1 General . 23
4.6.2 LCLS Configuration . 23
5 General Circuit Switched Core Network Domain Architecture . 23
6 Call Establishment . 24
6.1 Basic Mobile Originating Call. 24
6.1.1 Basic Mobile Originating Call with BICC based CS core network . 24
6.1.1.1 General . 24
6.1.1.2 Initial Addressing . 24
6.1.1.3 Access Bearer Assignment . 24
6.1.1.3.1 Assignment performed after LCLS Negotiation through Core Network . 24
6.1.1.3.2 Assignment performed before LCLS Negotiation . 24
6.1.1.3.3 oBSS behavior . 24
6.1.1.4 Backward LCLS Negotiation . 24
6.1.1.5 LCLS Through-Connection . 25
6.1.1.6 LCLS Status Reporting . 25
6.1.1.7 MGW/User plane . 25
6.1.2 Basic Mobile Originating Call with SIP-I based CS core network . 25
6.1.2.1 General . 25
6.1.2.2 Initial Addressing . 26
6.1.2.3 Access Bearer Assignment . 26
6.1.2.4 Backward LCLS Negotiation . 26
ETSI
3GPP TS 23.284 version 10.5.0 Release 10 4 ETSI TS 123 284 V10.5.0 (2013-01)
6.1.2.5 LCLS Through-Connection . 26
6.1.2.6 LCLS Status Reporting . 26
6.1.2.7 MGW/User plane . 26
6.2 Basic Mobile Terminating Call . 26
6.2.1 Basic Mobile Terminating Call with BICC based CS core network . 26
6.2.1.1 General . 26
6.2.1.2 Actions at Intermediate Nodes (including GMSC) . 26
6.2.1.2.1 Initial Addressing . 26
6.2.1.2.2 Backward LCLS Negotiation . 27
6.2.1.2.3 Through-Connection . 27
6.2.1.2.4 LCLS Status Reporting within CN . 27
6.2.1.2.5 MGW/User plane. 27
6.2.1.3 Actions at Terminating Call side . 27
6.2.1.3.1 Initial Addressing . 27
6.2.1.3.2 Backward LCLS Negotiation . 27
6.2.1.3.3 Access Bearer Assignment . 28
6.2.1.3.4 LCLS Through-Connection . 28
6.2.1.3.5 LCLS Status Reporting . 28
6.2.1.3.6 MGW/User plane. 28
6.2.2 Basic Mobile Terminating Call with SIP-I based CS core network . 28
6.2.2.1 General . 28
6.2.2.2 Actions at Intermediate Nodes (including GMSC) . 29
6.2.2.2.1 Initial Addressing . 29
6.2.2.2.2 Backward LCLS Negotiation . 29
6.2.2.2.3 Through-Connection . 29
6.2.2.2.4 LCLS Status Reporting within CN . 29
6.2.2.2.5 MGW/User plane. 29
6.2.2.3 Actions at Terminating Call side . 29
6.2.2.3.1 Initial Addressing . 29
6.2.2.3.2 Backward LCLS Negotiation . 29
6.2.2.3.3 Access Bearer Assignment . 29
6.2.2.3.4 LCLS Through-Connection . 29
6.2.2.3.5 LCLS Status Reporting . 29
6.2.2.3.6 MGW/User plane. 29
6.3 Basic Mobile to Mobile End to End Call Examples . 30
6.3.1 Basic Call Establishment Connection Model for LCLS . 30
6.3.2 LCLS established, Basic Call Example with BICC based CS core network, forward bearer
establishment . 31
6.3.3 LCLS not established, Basic Call Example with BICC based CS core network . 36
6.3.4 LCLS established, Basic Call Example with SIP-I based CS core network . 38
6.3.5 LCLS established, Basic Call Example with BICC based CS core network, backward bearer
establishment . 44
7 Call Clearing and LCLS Break/Re-establishment . 47
7.1 Call Clearing . 47
7.2 LCLS Break. 47
7.2.1 MSC server Initiated . 47
7.2.1.1 Principles . 47
7.2.1.2 MSC server actions . 48
7.2.1.3 GMSC server actions . 48
7.2.1.4 BSS actions . 48
7.2.2 BSS Initiated . 49
7.2.2.1 Principles . 49
7.2.2.2 Immediate LCLS break . 49
7.2.2.2.1 BSS actions . 49
7.2.2.2.2 MSC server actions . 49
7.2.2.2.3 GMSC server actions . 49
7.2.2.3 BSS Requesting LCLS Release from Core Network . 49
7.2.2.3.1 BSS actions . 49
7.2.2.3.2 MSC server actions . 50
7.2.2.3.3 GMSC server actions . 50
7.2.3 Intermediate Node/GMSC Server Initiated . 50
ETSI
3GPP TS 23.284 version 10.5.0 Release 10 5 ETSI TS 123 284 V10.5.0 (2013-01)
7.2.3.1 Principles . 50
7.2.3.2 Intermediate Node/GMSC server actions . 50
7.2.3.3 MSC server actions . 50
7.2.3.4 BSS actions . 51
7.2.4 LCLS Break Example Call Flows . 51
7.2.4.1 LCLS Break Connection Model for LCLS . 51
7.2.4.2 MSC server Initiated . 52
7.2.4.3 BSS Initiated, Immediate LCLS Break . 53
7.2.4.4 BSS Initiated, LCLS Break requested from Core Network. 54
7.2.4.5 Intermediate Node/GMSC Server Initiated . 56
7.2.4.6 MSC server Initiated when Access Side Termination is isolated in MGW . 58
7.3 LCLS Re-establishment . 59
7.3.1 MSC server Initiated . 59
7.3.1.1 Principles . 59
7.3.1.2 MSC server actions . 59
7.3.1.2.1 LCLS re-establishment to the network side . 59
7.3.1.2.2 LCLS re-establishment to the BSS . 59
7.3.1.2.3 LCLS Status update to the network side . 59
7.3.1.3 GMSC server actions . 59
7.3.1.4 BSS actions . 60
7.3.2 BSS Initiated . 60
7.3.3 Intermediate Node / GMSC Server Initiated . 60
7.3.3.1 Principles . 60
7.3.3.2 Intermediate Node / GMSC server actions . 60
7.3.3.3 MSC server actions . 60
7.3.3.4 BSS actions . 61
7.3.4 LCLS Re-establishment Example Call Flows. 61
7.3.4.1 LCLS Re-establishment Connection Model for LCLS . 61
7.3.4.2 MSC server Initiated Example Call Flow . 61
7.3.4.3 Intermediate Node / GMSC Server Initiated Example Call Flow . 63
7.3.4.4 MSC server Initiated when Access Side Termination is isolated in MGW . 64
8 Handover/Relocation . 65
8.1 UMTS to UMTS . 65
8.2 UMTS to GSM . 66
8.2.1 General . 66
8.2.2 Intra-MSC UMTS to GSM Handover . 66
8.2.2.1 Intra-MSC UMTS to GSM Handover that establishes Local Switching . 66
8.2.2.1.1 General . 66
8.2.2.1.2 Relocation Required . 66
8.2.2.1.3 Handover Request Acknowledge . 66
8.2.2.1.4 Handover Complete . 66
8.2.2.1.5 Example . 66
8.2.2.1.5.1 Connection Model . 66
8.2.2.1.5.2 Basic Sequence for Intra-MSC UMTS to GSM Handover that establishes Local Switching . 69
8.2.2.2 Intra-MSC UMTS to GSM Handover that does not establish LCLS . 70
8.2.3 Inter-MSC UMTS to GSM Handover . 70
8.2.3.1 Inter-MSC UMTS to GSM Handover that establishes Local Switching . 70
8.2.3.1.1 General . 70
8.2.3.1.2 MSC-1 / MGW-1 . 70
8.2.3.1.2.1 Relocation Required. 70
8.2.3.1.2.1 Relocation Required. 70
8.2.3.1.2.2 Handover Request Acknowledge . 70
8.2.3.1.2.3 Bearer establishment between MGW-1 and Target MGW . 71
8.2.3.1.2.4 MGW Flow Direction Control . 71
8.2.3.1.2.5 Relocation Command/Handover Detect . 71
8.2.3.1.2.6 Handover Complete . 71
8.2.3.1.3 Target MSC Server / Target MGW . 71
8.2.3.1.3.1 Prepare Handover Request message and MGW selection . 71
8.2.3.1.3.2 Handover Request Acknowledge . 71
8.2.3.1.3.3 Bearer establishment towards Target BSS . 71
8.2.3.1.3.4 Bearer establishment between MGW-1 and Target MGW . 71
ETSI
3GPP TS 23.284 version 10.5.0 Release 10 6 ETSI TS 123 284 V10.5.0 (2013-01)
8.2.3.1.3.5 Handover Complete . 71
8.2.3.1.4 Example of Inter-MSC UMTS to GSM Handover that establishes Local Switching . 72
8.2.3.1.4.1 Connection Model . 72
8.2.3.1.4.2 Basic Sequence for Inter-MSC UMTS to GSM Handover that establishes Local Switching . 73
8.2.3.2 Inter-MSC UMTS to GSM Handover that does not establish Local Switching . 77
8.3 GSM to UMTS . 77
8.3.1 Intra-MSC GSM to UMTS Relocation . 77
8.3.1.1 General . 77
8.3.1.2 Handover Required . 77
8.3.1.3 Iu Relocation Request Acknowledge . 77
8.3.1.4 Handover Command/Iu Relocation Detect . 77
8.3.1.5 Iu Relocation Complete . 78
8.3.1.6 Example . 78
8.3.1.6.1 Connection Model . 78
8.3.2 Inter-MSC GSM to UMTS Relocation . 84
8.3.2.1 General . 84
8.3.2.2 MSC-1 / MGW-1 . 84
8.3.2.2.1 Handover Required . 84
8.3.2.2.2 Iu Relocation Request Acknowledge. 84
8.3.2.2.3 Bearer establishment between MGW-1 and Target MGW . 84
8.3.2.2.4 MGW Flow Direction Control . 84
8.3.2.2.5 Handover Command/Iu Relocation Detect . 84
8.3.2.2.6 Iu Relocation Complete . 84
8.3.2.3 Target MSC Server / Target MGW . 85
8.3.2.3.1 Prepare Handover Request message and MGW selection . 85
8.3.2.3.2 Bearer establishment towards Target RNC . 85
8.3.2.3.3 Bearer establishment between MGW-1 and Target MGW . 85
8.3.2.4 Example of Inter-MSC GSM to UMTS Relocation . 85
8.3.2.4.1 Connection Model . 85
8.3.2.4.2 Basic Sequence for Inter-MSC handover that breaks Local Switching . 88
8.4 GSM to GSM . 92
8.4.1 Intra-MSC Inter-BSS GSM to GSM Handover . 92
8.4.1.1 Intra-MSC Inter-BSS GSM to GSM Handover that breaks Local Switching . 92
8.4.1.1.1 General . 92
8.4.1.1.2 Handover Required . 92
8.4.1.1.3 MGW Flow Direction Control . 92
8.4.1.1.4 Handover Request Acknowledge . 93
8.4.1.1.5 Handover Command/Handover Detect . 93
8.4.1.1.6 Handover Complete . 93
8.4.1.1.7 Example . 93
8.4.1.1.7.1 Connection Model . 93
8.4.1.1.7.2 Basic Sequence for Inter-BSS Handover that breaks Local Switching . 96
8.4.1.2 Intra-MSC Inter-BSS GSM to GSM Handovers that establishes Local Switching . 98
8.4.1.2.1 General . 98
8.4.1.2.2 Handover Required . 98
8.4.1.2.3 Bearer establishment towards Target BSS . 98
8.4.1.2.4 MGW Flow Direction Control . 98
8.4.1.2.5 Handover Request Acknowledge . 98
8.4.1.2.6 Handover Command/Handover Detect . 99
8.4.1.2.7 Handover Complete . 99
8.4.1.2.8 Example . 99
8.4.1.2.8.1 Connection Model . 99
8.4.1.2.8.2 Basic Sequence for Inter-BSS Handover that establishes Local Switching . 101
8.4.2 Inter-MSC GSM to GSM Handover . 103
8.4.2.1 Inter-MSC GSM to GSM Handover that breaks Local Switching . 103
8.4.2.1.1 General . 103
8.4.2.1.2 MSC-1 / MGW-1 . 103
8.4.2.1.2.1 Handover Required . 103
8.4.2.1.2.2 Handover Request Acknowledge . 103
8.4.2.1.2.3 Bearer establishment between MGW-1 and Target MGW . 104
8.4.2.1.2.4 MGW Flow Direction Control . 104
8.4.2.1.2.5 Handover Command/Handover Detect . 104
ETSI
3GPP TS 23.284 version 10.5.0 Release 10 7 ETSI TS 123 284 V10.5.0 (2013-01)
8.4.2.1.2.6 Handover Complete . 104
8.4.2.1.3 Target MSC Server / Target MGW . 105
8.4.2.1.3.1 Prepare Handover Request message and MGW selection . 105
8.4.2.1.3.2 Handover Request Acknowledge . 105
8.4.2.1.3.3 Bearer establishment towards Target BSS . 105
8.4.2.1.3.4 Bearer establishment between MGW-1 and Target MGW . 105
8.4.2.1.3.5 LCLS Negotiation in Initial Address message . 105
8.4.2.1.4 Example of Inter-MSC Handover that breaks Local Switching . 105
8.4.2.1.4.1 Connection Model . 105
8.4.2.1.4.2 Basic Sequence for Inter-MSC handover that breaks Local Switching . 108
8.4.2.2 Inter-MSC GSM to GSM Handover that establishes Local Switching . 112
8.4.2.2.1 General . 112
8.4.2.2.2 MSC-1 / MGW-1 . 112
8.4.2.2.2.1 Handover Required . 112
8.4.2.2.2.2 Handover Request Acknowledge . 113
8.4.2.2.2.3 Bearer establishment between MGW-1 and Target MGW . 113
8.4.2.2.2.4 MGW Flow Direction Control . 113
8.4.2.2.2.5 Handover Command/Handover Detect . 113
8.4.2.2.2.6 Handover Complete . 113
8.4.2.2.3 Target MSC Server / Target MGW . 113
8.4.2.2.3.1 Prepare Handover Request message and MGW selection . 113
8.4.2.2.3.2 Handover Request Acknowledge . 113
8.4.2.2.3.3 Bearer establishment towards Target BSS . 113
8.4.2.2.3.4 Bearer establishment between MGW-1 and Target MGW . 113
8.4.2.2.3.5 LCLS Negotiation in Initial Address message . 114
8.4.2.2.4 Example of Inter-MSC Handover that establishes Local Switching . 114
8.4.2.2.4.1 Connection Model . 114
8.4.2.2.4.2 Basic Sequence for Inter-MSC GSM to GSM Handover that establishes Local Switching . 116
8.4.2.3 Inter-MSC Handover that leaves a not Locally Switched Call unchanged . 119
8.4.3 Subsequent Inter-MSC GSM to GSM Handover back to the Anchor MSC . 119
8.4.4 Subsequent GSM to GSM Handover to a third MSC . 119
8.4.5 BSS Internal Handover . 119
8.4.5.1 General . 119
8.4.5.2 Internal Handover Required . 119
8.4.5.3 Internal Handover Command . 119
8.4.5.4 Handover Complete . 120
8.4.5.5 Example BSS Internal Handover that Establishes Local Switching . 120
8.4.5.5.1 Connection Model . 120
8.4.5.5.2 Basic Sequence for BSS Internal Handover that Establi
...