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Interworking of IP Multimedia Core Networks Between

3GPP and WLANIEEE Wireless Communications 2005

Presenter : 卓瑩鎗

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Outline

Introduction IMS architecture for 3GPP networks (SIP WLAN MeGaCo ….) Interworking model and scenarios SIP 3GPP-IETF Interworking Conclusions Impression ＆ English sentence

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Introduction

3GPP ? UMTS ? WLAN ? This article analyzes how the

interconnection of 3GPP and WLAN networks may be performed in order to support different levels of service interconnection.

ITU-H.323 IETF-SIP 3GPP-IMS

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IMS Architecture for 3GPP Networks

IMS (Internet Protocol Multimedia Subsystem)

security accounting roaming QoS etc..

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UMTS-IMS general architecture

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component

MRFC (Multimedia Resource Function Controller)

MRFP (Multimedia Resource Function Processor)

MGCF HSS AS UTRAN

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Protocol

SIP (session initiation protocol) H.248 (MeGaCo) COPS (Common Object Policy Service) Diameter

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GPRS

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3GPP-WLAN interworking model

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WLAN

802.11x,Bluetooth,HyperLan,WiMAX Advantage : mobility..

picomobility micromobility macromobility

Disadvantage 1. Qos 2. Security(risk higher than 3GPP UTRAN)

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Interworking model and scenarios

Release6 : first three levels 1. basic, customer service 2. 3GPP 3. IMS to WLAN, re-establish 4. Handover(data loss,delay) 5. no noticeable service interruption

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Interconnection levels

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SIP : 3GPP vs IETF

SIP is an extensible protocol. Although the aim of 3GPP is to incorporate

Internet standards unchanged, the existing differences between mobile and fixed networks have necessitated additions or modifications such that the IETF specifications fulfill the needs of 3GPP.

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3GPP SIP Functionalities (I) General Extensions

Session Operation Extensions

QoS-Related Extensions

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3GPP SIP Functionalities (II)

AAAC Related Extensions

Security Extensions

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3GPP SIP Functionalities (III)

Universal Decompression Virtual Machine IPSec header Precondition BYE etc..

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Conclusions

SIP is the IMS key signaling protocol. SIP/SDP may be freely extended

so, It’s difficult to Implementation It’s important to evaluate IMS deployment

when dealing with lv5 regarding seamless service continuity.

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Impression ＆ English Sentence

Conciseness Extracurricular

WLANs are commonly used to transport IP packets. 3GPP WLAN interworking should thus be built on top of the IP Protocol, and not be limited to any specific WLAN technology

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Reference

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3GPP specification