Browse Prior Art Database

Techniques To Support VoIP Using WAP In A 2G And GPRS In 2.5G Networks

IP.com Disclosure Number: IPCOM000007077D
Original Publication Date: 2002-Feb-22
Included in the Prior Art Database: 2002-Feb-22
Document File: 5 page(s) / 125K

Publishing Venue

Motorola

Related People

Derek Oxley: AUTHOR [+4]

Abstract

The invention describes techniques that provide 3G Voice Over Internet Protocol (VoIP) capabilities to users with WAP phones in 2G networks and GPRS phones in 2.5 G networks. The technique involves extending the VoIP bearer stream across the Public Switched Telephone network (PSTN) to provide an extension into the 2G/2.5G networks using the Circuit Switched Domain, while using the WAP and GPRS transports for Session Initiation Protocol (SIP) signaling.

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Techniques To Support VoIP Using WAP In A 2G and GPRS In  2.5G Networks

Derek Oxley

Nandakishore Anant Albal

Douglas Andrew White

Sidney Tang

I.                   Abstract

The invention describes techniques that provide 3G Voice Over Internet Protocol (VoIP) capabilities to users with WAP phones in 2G networks and GPRS phones in 2.5 G networks. The technique involves extending the VoIP bearer stream across the Public Switched Telephone network (PSTN) to provide an extension into the 2G/2.5G networks using the Circuit Switched Domain, while using the WAP and GPRS transports for Session Initiation Protocol  (SIP) signaling.

II.                Introduction

In 3G Communication Systems such a Universal Mobile Telephony System (UMTS), VoIP services will become readily available due to specific enhancements over the previous 2.5G networks. These enhancements include a Multimedia Client in the end user device, Quality of Service (QoS) enhancements in the Radio Access Network (RAN) and the UMTS infrastructure components, and the introduction of the new IP Multimedia Subsystem (IM). Initially it is expected that these 3G systems will co-exist with 2G and 2.5G networks and eventually cover the same geographic area as the 2G/2.5G systems. During this lengthy transition period 3G operators would want their users to continue to receive VoIP service from the 2G/2.5G network operators when they roam between the 3G “islands”. Additionally, as a competitive response to 3G operators, the 2G/2.5G operators would want to offer 3G-like VoIP services to their existing 2G/2.5G subscriber base.

III.             Problem Statement

A seamless and undisrupted 3G VoIP service will greatly enhance the end-user experience of a 3G user if access to the 3G VoIP service could be provided during roaming on a 2G/2.5G network. Additionally the migration to 3G would be facilitated if existing users in the 2G/2.5G networks were able to experience 3G VoIP services. Currently the Packet Data QoS capabilities of the 2.5G networks do not provide the necessary functionality for reliable delivery of a VoIP service. This publication describes a scheme that allows a 3G Mobile, a 2G WAP enabled client or a 2.5G GPRS device with a Multimedia Client, to get VoIP service in a 2G/2.5G network.

IV.              3G VoIP Service Background

A recent trend in the Telecommunications industry has been to separate the Control and Bearer functions to enable a great degree of operational flexibility and scalability.   The 3G VoIP service follows this trend.  End user devices will have a Multimedia Client, such as a SIP Client in UMTS that communicates with the IP Multimedia Subsystem in the 3G network for establishment and routing of the VoIP session. The End user device will also have a Bearer handling function that establishes a bi-directional audio stream for sending and receiving the voice traffic.  The Multimedia Client is an enabler for internet style addressing, that has addresses in the form (user@domain); the traditional E.164 addressing scheme is also suppo...