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TS 23.236 SA2 ★
Intra-Domain Connection
of RAN Nodes to Multiple CN Nodes

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V15.0.0 (PDF) 2018/06 42 p.

V14.0.0 2016/09 43 p.

V13.0.0 2015/06 42 p.

V12.0.0 2013/06 42 p.

V11.0.0 2012/09 42 p.

V10.3.0 2012/03 41 p.

V9.0.0 2009/12 41 p.

V8.1.0 2009/12 41 p.

V7.0.0 2006/12 39 p.

V6.3.0 2006/03 39 p.

V5.4.0 2005/10 38 p.

Rapporteur: Mr. Terrill, Stephen

This document covers the details for the Intra Domain Connection of RAN Nodes to Multiple CN Nodes for GERAN and UTRAN based systems. In particular, it details the impacts to GSM and UMTS systems and the stage 2 procedures for the support of connecting a RNC or BSC to multiple MSC servers or SGSNs.

full Table of Contents for TS 23.236 Word version: 15.0.0

1 Scope Word-p. 6

3 Definitions, symbols and abbreviations Word-p. 7

3.1 Definitions

3.3 Abbreviations

4 General Description Word-p. 8

4.1 Iu Flex Technical Requirements

4.3 Pool-Area and Network Resource Identification Word-p. 10

4.4 NAS Node Selection Function

4.5 Load Balancing Word-p. 11

4.5a Load Re-Distribution [R6] Word-p. 12

4.5a.2 Network Mode of Operation = 1 Word-p. 13

4.6 Mobility Management

4.7 Default CN node and Backwards Compatibility Word-p. 14

4.8 Support of combined mobility management procedures

4.8.2 Routing area update

4.9 VGCS/VBS Compatibility Issues Word-p. 15

4.10 Interactions with E-UTRAN [R8]

5 Functional Description

5.1 MS Functions

5.2 RNC Functions Word-p. 16

5.2.1 Load Re-Distribution function in RNC [R6]

5.3 BSC Functions

5.3.1 A interface mode

5.3.2 Gb mode Word-p. 17

5.3.3 Iu mode Word-p. 18

5.3.4 Load Re-Distribution function in BSC [R6]

5.4 MSC Functions

5.4.1 TMSI Allocation

5.4.2 Mobility Management and Handover/Relocation

5.4.3 Backward Compatibility and Default MSC

5.4.4 Support of Combined Procedures

5.4.5 Load Re-Distribution function in MSC [R6]

5.5 SGSN Functions Word-p. 19

5.5.1 P-TMSI Allocation

5.5.2 Mobility Management and Handover/Relocation

5.5.3 Backward Compatibility and Default SGSN

5.5.4 Support of Combined Procedures

5.5.5 CS Paging Word-p. 20

5.5.6 Load Re-Distribution function in SGSN [R6]

6 Application Examples

6.1 Network configuration example 1

6.2 Network configuration example 2

7 Specific Examples Word-p. 21

7.1 Building blocks for signalling flows

7.1.1 RAN node selecting CN node in A interface mode

7.1.2 RAN node selecting CN node in Gb interface mode

7.1.3 RAN node selecting CN node in Iu interface mode

7.1.4 New CN node selecting old CN node

7.1.5 Old CN node selecting new CN node Word-p. 22

7.1.6 SGSN selecting MSC

7.2 Signalling flow for Attach (Iu interface mode)

7.3 Signalling flows for Service Request (Iu interface mode) Word-p. 24

7.3.1 Service Request initiated by MS

7.3.2 Service Request initiated by network Word-p. 25

7.4 Signalling flow for Routing Area Update (Iu interface mode) Word-p. 27

7.5 IMSI attach procedure / Location area update with IMSI Word-p. 30

A Network configuration examples Word-p. 33

A.1 One city centre surrounded by residential areas

A.1.1 Assumptions

A.1.2 TMSI calculation Word-p. 34

A.2 3 Neighbouring large city centres

A.3 Support of Dedicated Core Networks [R13] Word-p. 39

B Change history Word-p. 41