TR 23.923
Combined GSM and Mobile IP mobility handling in UMTS IP CN
V3.0.0 (PDF)
2000/06 76 p.
- Rapporteur:
- Ms. Hubbard, Elisabeth
full Table of Contents for TR 23.923 Word version: 3.0.0
0 Introduction p. 6
A single generic mobility handling mechanism that allows roaming between all types of access networks would allow users to conveniently move between fixed and mobile networks, between public and private networks as well as between PLMNs with different access technologies. The ongoing work in the IETF Mobile IP working group is targeted towards such a mechanism. To offer Mobile IP(+) also to UMTS and GPRS users, a standard is needed for how to use Mobile IP in overlay to UMTS/GPRS.
Additionally, Mobile IP(+) could be used to handle mobility in the UMTS CN. Potentially, this would also allow cost savings for operators and a broadening of the market for manufacturers.
The present document is the result of two 3GPP-TSG SA-WG2 work items on Mobile IP:
- "Combined GSM and Mobile IP mobility handling in UMTS IP CN", which main goal is to describe and evaluate an architecture that uses Mobile IP+ for mobility management and tunnelling within the CN. With respect to the work in IETF, a time scale for including this architecture in UMTS standards should be proposed;
- "GPRS Mobile IP interworking", that aims at defining enhancements to the current GPRS standards to allow Mobile IP(+) to be used as an overlay to UMTS/GPRS for release 99. Conclusions of the technical report is presented in clause 15.
1 Scope p. 7
The present document contains a feasibility study on using Mobile IP+ as a tunnelling and mobility management protocol in combination with GSM/UMTS mobility management in the packet domain of UMTS CN. A target architecture will be described and evaluated and the migration path from the current GPRS architecture towards the target architecture will be defined. It shall also describe the driving forces for moving from GTP towards Mobile IP+ as well as the benefits and disadvantages of the target architecture. A time schedule, i.e. UMTS releases, for the standardisation of such an architecture shall be proposed. Work on Mobile IP+ in the IETF should be taken into account.
This report will also contain a study on how to offer Mobile IP+ as an overlay to GPRS. This would allow an end user device, which is connected to the Internet (or intranet etc.) via LAN, to be reconnected during an active session via GPRS/UMTS or visa versa, without the need for any re-configuration or re-start of applications. The outcome of this part shall be part of UMTS release 99. Proposed solutions need to be balanced between the requirement to minimise the impact on the current GPRS standards and the requirements generated by further development of using Mobile IP+ within the CN in an efficient way. The output of this study is a description of the system and a set of CR's for those standards handled by 3GPP-TSG SA-WG2.
2 References p. 7
3 Definitions and abbreviations p. 9
3.1 Definitions p. 9
3.2 Abbreviations p. 11
4 Working Assumptions p. 12
5 Requirements on UMTS Packet Domain p. 12
6 Current Status of Mobile IP, March 1999 p. 13
6.1 Mobile IP RFC's p. 13
6.2 Mobile IP+ Drafts p. 14
6.3 Basic Principles of Mobile IPv4 p. 16
6.4 Differences between IPv4 and IPv6 p. 17
6.5 Reverse tunnels p. 17
6.6 Use of Route Optimisation p. 18
7 Stepwise introduction of Mobile IP in the CN p. 18
7.1 Step 1 - Offering Mobile IP(+) service p. 18
7.2 Step 2 - Intermediate GPRS-MIP(+) system p. 19
7.3 Step 3 - Using Mobile IP+ for Intra System Mobility p. 20
8 General Considerations and Explanations p. 22
8.1 The Care-of address p. 22
8.1.1 Saving Radio Resources and IPv4 Addresses with FA Care-of Addresses p. 22
8.1.2 The Care-of address in IPv6 p. 22
8.2 The Home Address p. 22
8.3 Location of the HA and the FA p. 23
8.4 Terminal aspects p. 23
8.4.1 Terminal Model p. 23
8.5 Need for Broadcasting over Radio p. 23
8.6 Security p. 24
8.6.1 Mobile IPv4 control messages: security issues p. 25
8.6.2 MIPv4 Protocol Security Analysis p. 25
8.6.2.1 FA-ME Considerations p. 25
8.6.2.2 HA-ME Considerations p. 25
8.6.2.3 ME-CH Considerations p. 26
8.6.2.4 Geographical position p. 26
8.6.2.5 Signalling p. 26
8.6.2.6 Header compression and security p. 26
8.6.3 Screening and flooding p. 26
8.7 AAA (Authentication, Authorisation and Accounting) and Roaming issues p. 26
8.8 UMTS/GPRS Charging p. 29
9 First Step: MIP(+) in overlay to GPRS p. 31
9.1 General Design Criteria p. 31
9.2 Assumptions p. 31
9.3 Using the APN to Find a GGSN/FA p. 31
9.4 Detailed Description of Mobile IP(+) Registration in a UMTS/GPRS PLMN p. 32
9.4.1 AT Command p. 33
9.4.2 Activate PDP Context Request p. 33
9.4.3 Select Suitable GGSN p. 34
9.4.4 Create PDP Context Request p. 34
9.4.5 GGSN/FA Functionality p. 34
9.4.6 Create PDP Context Response p. 35
9.4.7 Activate PDP Context Accept p. 35
9.4.8 Foreign Agent Advertisement p. 35
9.4.9 Mobile IP(+) Registration Request p. 36
9.4.10 Mobile IP(+) Registration Reply p. 36
9.4.11 Insert PDP Address in GGSN PDP Context p. 37
9.5 The UMTS/GPRS Detach Procedure p. 37
9.6 Summary of Alterations of and Additions to Current GPRS Standards for Step 1 p. 37
10 Second Step: Intermediate UMTS/GPRS-MIP(+) System p. 37
11 Third Step: Target Architecture p. 41
11.1 General Design Criteria for step 3 p. 42
11.2 Assumptions p. 42
11.3 Using the APN to select MIP service p. 42
11.4 Session activation for ME requesting MIP(+) service and equipped with a MIP(+) client p. 42
11.4.1 AT Command p. 43
11.4.2 Activate PDP Context Request p. 43
11.4.3 Select MIP service p. 44
11.4.4 Activate PDP Context Accept p. 44
11.4.5 Foreign Agent Advertisement p. 44
11.4.6 Mobile IP(+) Registration Request p. 45
11.4.7 Mobile IP(+) Registration Reply p. 45
11.4.8 Insert PDP Address in IGSN PDP Context p. 45
11.5 User mobility support for ME requesting MIP(+) service and equipped with a MIP(+) client (GPRS) p. 46
11.5.1 Inter IGSN ROUTING AREA update for terminals requesting MIP(+) service and equipped with a MIP(+) client p. 47
11.5.1.1 Routing Area update request p. 47
11.5.1.2 SGSN context Request/Response p. 47
11.5.1.3 Security functions p. 48
11.5.1.4 SGSN Context Acknowledge p. 48
11.5.1.5 Forward Packets p. 48
11.5.1.6 Update Location p. 49
11.5.1.7 Cancel location and Cancel location Ack p. 49
11.5.1.8 Insert Subscriber Data and Insert Subscriber Data Ack p. 49
11.5.1.9 Update Location Ack p. 49
11.5.1.10 Routeing Area Update Accept p. 50
11.5.1.11 Routeing Area Update Complete p. 50
11.5.1.12 Mobile IP (+) Agent Advertisement p. 50
11.5.1.13 MIP registration p. 50
11.5.2 Intra IGSN ROUTING AREA update for terminals requesting MIP(+) service and equipped with a MIP(+) client p. 51
11.6 User mobility support for ME requesting MIP(+) service and equipped with a MIP(+) client (UMTS) p. 53
11.6.1 SRNC Relocation required p. 53
11.6.2 Forward SRNC relocation request p. 54
11.6.3 SRNC Relocation Request and SRNC Relocation Proceeding 1 p. 54
11.6.4 Forward SRNC Relocation Response p. 54
11.6.5 SRNC Relocation Proceeding 2 p. 54
11.6.6 SRNC Relocation Commit p. 55
11.6.7 SRNC Relocation Detect and SRNC Relocation Complete p. 55
11.6.8 New MM system Information and RLC restart p. 55
11.6.9 Routing Area Update Request p. 55
11.6.10 Mobile IP (+) Agent advertisement p. 56
11.6.11 MIP registration p. 56
11.6.12 Complete SRNC Relocation p. 56
11.6.13 Release p. 56
11.6.14 Update GPRS location, Cancel location, Insert subscriber data p. 57
11.6.15 Routing Area Update Accept and Complete p. 57
11.7 Traffic Cases p. 57
11.7.1 Sending Packets p. 57
11.7.2 Receiving Packets p. 57
11.8 Service Support p. 59
12 Compatibility Issues p. 61
12.1 IPv4 - IPv6 p. 61
12.1.1 Mixed IPv4 - IPv6 UMTS Networks p. 61
12.1.2 Network Elements that need changes if migrating from MIP(+)v4 to MIP(+)v6 p. 62
12.2 UMTS/GPRS - Mobile IP(+) p. 62
12.2.1 Support of Non-MIP(+) Mobiles in a MIP+ based backbone p. 63
12.2.1.1 Pre Mobile IP(+) situation p. 63
12.2.1.2 Handling ME's without MIP(+) functionality in a MIP+ based backbone p. 64
12.2.2 Interworking with GPRS PLMNs p. 65
12.2.3 Interworking between UMTS/GPRS PLMNs and Mobile IPv6 p. 65
13 Driving Forces p. 65
13.1 Mobile IP+ is standardised by the IETF p. 65
13.2 Mobile IP(+) is an end-to-end solution p. 66
13.3 Mobile IP(+) can support cellular and non cellular access p. 66
13.4 Mobile IP(+) does not impact location registers p. 66
14 Open Issues p. 66
15 Conclusions p. 67
A Mobile IP p. 68
$ Document change history p. 73
