A Signaling Architecture for All IP Wireless Networks

ITSUMO Groupitsumo@research.telcordia.com

An SAIC Company

allip_sig.ppt – 2

Objectives

Propose a signaling architecture for All IP wireless networks.

Describe an overall signaling architecture for interworking of All IP wireless networks with the existing mobile telephony and the PSTN.

Identify open issues for further study.

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Signaling Architecture of All IP Wireless Networks

3GAccess

SIP

3GAccess

SIP Server

MAAAQSIP

HR

3GAccess

SIP

3GAccess

SIP Server

MAAAQ SIP

VR

Wireline IP backbone network

InternetRegional IP network Regional IP network

Visiting Network Home Network

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Merits of the SIP-based Signaling Architecture Pros & Cons

Pros

SIP is a lightweight end-to-end protocol with a small set ofmessages that can be used for user as well as networknode signaling.

SIP uses a single request message for session initiation,and scales well over wide-area networks.

SIP is ideal for IP mobiles, enables mobiles to performsome intelligent networking functions themselves, andsupports non-IP mobiles via a customer gateway.

SIP provides a means of personal mobility that is a crucialpart of mobility management in wireless environments.

Cons

SIP specifications has not been completed yet, and needsmore work.

SIP itself does not support QoS. SIP does not support terminal mobility.

- Telcordia & Toshiba have proposed HMMP to the IETF. etc.

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Interworking with today’s Mobile Telephony & PSTN

1G/2G

Access

PSTN

1G/2G

Access

VLR HLRSS7

TCAP, ISUP

A Interface

3GAccess

Call Agent

MGCP MGCP

WG2 TG

Wireline IP backbone

3G Circuit Mode

3GAccess

WG3

3G Packet Mode

WG3

3GAccess

Transport

1G/2G signaling

All-IP signaling

3G Circuit & Packet 3G Circuit & Packet

3G Packet only

SIP

SIP

SIP Server

MAAAQ ALL IP Signaling

& Control

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Merits of the Overall Signaling ArchitecturePros & Cons

Pros

It allows incumbent services/network providers to use acall agent to extend the use of their existing signaling andcontrol systems as long as necessary.

The call agent controls TG, WG2, and WG3, acts as anintermediary between 1G/2G users and SS7, and does notneed to support any mobility, functions itself.

It allows a gradual evolution/migration of network andsignaling architecture towards the IP-centric signalingand control system of the envisioned end-to-end IPplatform.

Cons

The details of the IP-centric signaling and control systemof All IP wireless networks has yet to be determined.

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Summary & Open Issues

Proposed – a SIP based signaling architecture for All IP wireless networks, and

– an overall signaling architecture for interworking of All IP wireless networks and existing mobile telephony and PSTN.

Open issues for further study are:– MAAAQ entity, i.e.,

mobility management, Authentication, authorization, and accounting (AAA), and QoS management

on top of SIP, and

– an interworking module between the 2G wireless A interface and an SGCP/MGCP/MEGACO call agent.