Published online by Cambridge University Press: 04 December 2009
In the final chapter, we will look at some of the likely future developments of UMTS. We begin with the IP multimedia subsystem, which was introduced into the 3GPP specifications in release 5, and is intended for the delivery of real time, packet switched services to the user. We continue with a look at the long term evolution of UMTS, which is intended to be part of release 8, and will involve changes to the radio interface that will supply the user with much higher data rates than before. We conclude with an overview of the process for defining fourth generation systems, and a look at some of the likely candidates.
The IP multimedia subsystem
The IP multimedia subsystem (IMS) is an extra component of the fixed network. Its main objective is to deliver real time services such as voice and video over the core network's packet switched domain, which have not been supported by previous implementations of UMTS. This section describes the objectives and architecture of the IP multimedia subsystem. It then gives an overview of the protocols and operational procedures that it uses, and describes the services that have been defined for use on the IMS.
Objectives
The IMS is intended to bring three main benefits to network operators and to the user.
First, the IMS provides good end-to-end quality of service for packet switched data streams.
To save this book to your Kindle, first ensure [email protected] is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.