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The 3GPP2 Architecture Sridhar Machiraju CS294-3, Spring 2002, University of California at Berkeley.

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Presentation on theme: "The 3GPP2 Architecture Sridhar Machiraju CS294-3, Spring 2002, University of California at Berkeley."— Presentation transcript:

1 The 3GPP2 Architecture Sridhar Machiraju CS294-3, Spring 2002, University of California at Berkeley

2 Contents Introduction The 3GPP2 Architecture Mobility Management in 3GPP2 Functional comparison of 3GPP and 3GPP2. Architectural comparison of 3GPP and 3GPP2 The MWIF Architecture.

3 We saw that the 3GPP architecture evolved from the already-existing GPRS network. It can be viewed as IP-based multimedia enhancements to 2G networks. However, 3GPP2 has created a new architecture (there was no existing packet packet data service) for the 2G and 3G CDMA air interfaces. Introduction

4 Contents Introduction The 3GPP2 Architecture Mobility Management in 3GPP2 Functional comparison of 3GPP and 3GPP2. Architectural comparison of 3GPP and 3GPP2 The MWIF Architecture.

5 Basic Design Philosophy of 3GPP2 Leverage existing globally-accepted IETF protocols whenever possible e.g., mobile IP (for mobility), IPSec (for e2e security), AAA (authentication, authorization and accounting for network access). Some advantages are – –Interoperability/roaming with existing IP networks. –Easy deployment of new services. –Well understood standards.

6 The Official Reference Model!

7 A Simpler Version! BTSBSCMSC HLRVLR OTAF PDSNAAA SMS IPSCPSN PDN PSTN Control of Services Internet Base Station Packet data functions Traditional “Switching Point”

8 Much More Simpler! BTS – Base Transceiver Station BSC – Base Station Controller MSC – Mobile Switching Center PDSN - Packet Data Serving Node HA – Home Agent IWF – Inter-Working Function

9 Contents Introduction The 3GPP2 Architecture Mobility Management in 3GPP2 Functional comparison of 3GPP and 3GPP2. Architectural comparison of 3GPP and 3GPP2 The MWIF Architecture.

10 A Mobility Perspective Note that, for simple IP, the HA is not used. AAA is used for data service authentication. The PPP tunnel from the MS terminates at the PSDN which acts as the Foreign Agent (FA). The PSDN is the first hop IP router and performs Diffserv shaping, ingress filtering, handoff between PCFs. The PDSN is also responsible for forwarding accounting information to the appropriate AAA entity. The PCF maintains a layer 2 connection with the PSDN for sending/receiving packets for MSs under its control.

11 The Ultimate Goal – An All-IP Network

12 Contents Introduction The 3GPP2 Architecture Mobility Management in 3GPP2 Functional comparison of 3GPP and 3GPP2. Architectural comparison of 3GPP and 3GPP2 The MWIF Architecture.

13 Security and Mobility Management 3GPP uses GGSN, SGSN nodes. 3GPP does not allow heterogeneous access. The HLR is likely to be used by the SGSN for authenticating data users. Thus, access and data network authentication are integrated. 3GPP2 uses mobile IP and PSDN as FA/HA. It allows heterogeneous access. The PDSN uses an AAA infrastructure to authenticate data users. Access and data network authentication are separate.

14 Services etc. The 3GPP model has a SIP-like functionality in the 3 types of Call State Control Functions (CSCF). Location service in the 3GPP model is tied closely to the access. GTP is used to provide link-layer mobility. Though the specification is yet to be published, 3GPP2 has decided to use SIP. In the 3GPP2 model, location service is more of a database i.e., access- independent. Link layer mobility in the 3GPP2 world is viewed as a direct extension of mobile IP.

15 Note that, Due to the lack of standards for SIP with all potential applications like VoIP, there is a danger of 3GPP and 3GPP2 coming up with incompatible extensions to SIP which would have to be harmonized sometime later. The 3GPP2 specification is not as complete as the 3GPP specification. In the 3GPP specification, there is an option to place a mobile IP-based Foreign Agent in the GGSN. Still, this would introduce a lot of tunneling overhead in the GGSN- SGSN path (Mobile IP over GTP over IP).

16 Contents Introduction The 3GPP2 Architecture Mobility Management in 3GPP2 Functional comparison of 3GPP and 3GPP2. Architectural comparison of 3GPP and 3GPP2 The MWIF Architecture.

17 Emergency Services Network 3G-HLR UTRAN BSS/ GERAN 3G-HLR G-MSC Server IP Multimedia Subsystem PS Domain 3G-SGSN 3G-GGSN R-SGW MGCF MGW PSTN/ Legacy/External T-SGW Legacy mobile signalling Network Multimedia IP Networks Multimedia IP Networks MSC Server Signaling only User Data and Signaling BGCF Applications & Services SCP CSCF Application Service Control Transport CS Domain RAN 3G-HLR UMS HSS MRF GMLC MTTE 3GPP All-IP Network Architecture Model

18 3GPP NAM - Discussion 3GPP is divided into 4 planes – IP Multimedia, Packet-Switched, Data-Switched and Radio Access. At each plane, there exist data and control functions. The picture is very disorganized especially from traditional networking perspective. –Legacy transport gateways are on the same plane as applications. –HLR and Unified Messaging Service are in limbo. –As mentioned earlier, the location service is access dependent because of its presence in the lowest layer. –The CSCF has all the functionality; there is not much modularity. Transport and Control reside in the same functional node often. Applications have to talk to either of CSCF, HSS, SGSN. QoS is implemented in CSCF and GGSN.

19 Application Service Control Transport Media Gateway Control Roaming Signaling Gateway Service Application Network Capability Gateway Subscription QoS Manager Databases EIRDSISubPoli Trunk Signaling Gateway MAP 41 & GSM PSTN IP Network Session Control Manager Core QoS Manager Media Gateway Border Router Position Server Position Determining Entity AAA Legacy MS Domain Support Media Resource Function Mobile IP Home Agent Access Net. Access Gateway FA/ Attendant BSC + PCF BTS MM Other Access Networks MS Signaling-Control Bearer Radio 3GPP2 All-IP Network Architecture Model

20 3GPP2 NAM - Discussion 3GPP2 fits into the Transport, Control, Service, Application Plane model much better. The PSDN will have only the HA/FA functionality unlike the GSN nodes. Applications talk to only the NCG. The modularity of this model over the 3GPP model is seen in the case of the QoS manager. The HLR, ESI, location information etc are captured as services available by querying databases.

21 Contents Introduction The 3GPP2 Architecture Mobility Management in 3GPP2 Functional comparison of 3GPP and 3GPP2. Architectural comparison of 3GPP and 3GPP2 The MWIF Architecture.

22 The Mobile Wireless Internet Forum (MWIF) MWIF is a non-profit association of wireless companies whose objective is to define a single mobile wireless and Internet architecture independent of the access technology. They have a network reference model to achieve this. Backwards compatibility is still a problem. Notice the service discovery server in the MWIF architecture. The CSCF functionality is in the CSM and Session Proxy.

23 Directory Services il Application Service Control Transport INTERNETIntranetPSTN MAP 41 & GSM Enterprise Home Mobility Manager Access Network TerminalUIM Access Gateway IP Address Manager Access Transport Gateway Mobile Attendant Transport Gateway Functional Entities Media Gateway IP Gateway Signaling Gateway Media Gateway Controller Multimedia Resource Function Communications Session Manager (CSM) Session Proxy Session Anchor AAA Functional Entities Authentication Server Home IP Address Manager Authorization Server Accounting Server Location Server Global Name Server Policy Repository Profile Server Application Functional Entities Core Network Application(s) 3rd Party Application(s) Multimedia Resource Controller Resource Manager Geographic Location Manager Service Discovery Server Bearer Signaling-Control Resource Directory MWIF All-IP Network Architecture Model

24 Summary Though the 3GPP and 3GPP2 NAM differ, active harmonization initiatives such as MWIF are cause for optimism. Remember that harmonization on the access is also being tried for (or else dual mode devices would be necessary). SIP seems to be the choice for session initiation over H.323 and other protocols. There are strong reasons for using IPv6 in 3G networks. But, all commercial 3G networks till date use IPv4 (since it is easier to deploy).


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