TS 100 527 : 7.0.0

Intellectual Property Rights
Foreword
1 Scope
2 References
3 Definitions and abbreviations
4 Role, functional composition of MSCs and
  interfaces for handover
  4.1 MSC-A
  4.2 MSC-B
5 Handover initiation conditions
6 General description of the procedures for intra
   - MSC handovers
  6.1 Procedure for Intra - MSC Handovers
7 General description of the procedures for inter
  - MSC handovers
  7.1 Basic handover procedure requiring a circuit
      connection between MSC-A and MSC-B
  7.2 Basic handover procedure not requiring the
      establishment of a circuit connection between
      MSC-A and MSC-B
  7.3 Procedure for subsequent handover requiring a
      circuit connection between MSC-A and MSC-B
  7.4 Procedure for subsequent handover not requiring
      a circuit connection between MSC-A and MSC-B
8 Detailed procedures in MSC-A
  8.1 BSS/MSC and MS/MSC procedures in MSC-A
      (functional unit 1)
  8.2 Call control procedures MSC-A
      (functional unit 2)
  8.3 Handover control procedures MSC-A
      (functional unit 3)
  8.4 MAP procedures in MSC-A (functional unit 4)
  8.5 Interworking between Handover control procedures
      and MAP procedures in MSC-A
  8.6 Compatibility with GSM Phase 1
9 Detailed procedures in MSC-B
   9.1 BSS/MSC (MS/BSS) procedures MSC-B
       (functional unit 1)
   9.2 Call control procedures MSC-B
       (functional unit 2)
   9.3 Handover control procedures MSC-B
       (functional unit 3)
   9.4 MAP procedures MSC-B (functional unit 4)
   9.5 Interworking between Handover control
       procedures and MAP procedures in MSC-B
   9.6 Compatibility with GSM Phase 1
10 Subsequent channel assignment using a circuit
   connection between MSC-A and MSC-B
11 Directed retry handover
12 SDL diagrams
Annex A (informative): Change Request History
History

Contains a detailed description of the handover procedures to be used in GSM PLMNs. The purpose of the handover procedures, as described in the document, are to ensure that the connection to the Mobile Station (MS) is maintained as it moves from one Base Station System (BSS) area to another. It considers the following two cases: i) Handover between Base Stations connected to the same MSC, this is termed an Intra-MSC handover. ii) Handover between Base Stations connected to different MSCs, this is termed an Inter-MSC handover.