IMS architecture for 3G Mobile
and PC audio/video convergence
How to extend the broadband mobile audio/vide...
Whitepaper: IMS architecture for 3G Mobile and PC audio/video convergence

Whitepaper: IMS architecture for 3G Mobile and PC audio/video convergence

     Inbound/outbound: both mobile and PC   ...
Whitepaper: IMS architecture for 3G Mobile and PC audio/video convergence

IP-multimedia applications. To overcome this...
Whitepaper: IMS architecture for 3G Mobile and PC audio/video convergence

MGCF/MGW: 3G Gateway                        ...
Whitepaper: IMS architecture for 3G Mobile and PC audio/video convergence

      Integration with network elements like...
Whitepaper: IMS architecture for 3G Mobile and PC audio/video convergence

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IMS architecture for 3G Mobile and PC audio/video convergence


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IMS architecture for 3G Mobile and PC audio/video convergence

  1. 1. Whitepaper IMS architecture for 3G Mobile and PC audio/video convergence How to extend the broadband mobile audio/video network to the internet users
  2. 2. Whitepaper: IMS architecture for 3G Mobile and PC audio/video convergence user base spending habits regardless of the medium they are using to consume these Abstract services. One of the most discussed challenges that Extending their services to the Internet is a way worldwide carriers are facing today is the for mobile carriers to start building an Internet telecommunication networks convergence. user base, keep control of their customer and match their communication needs even when Third generation mobile networks and using their PC. broadband access to the Internet are spreading This whitepaper introduces an architecture that together with new challenges and powers a business model where a softphone is opportunities. The IP Multimedia Subsystem distributed to Internet users which are enabled (IMS) is the acclaimed architectural model that to interoperate using voice and video calls with is guiding the transition to the next generation carrier’s mobile network. In the following of IP based telecommunication services. paragraphs different flavours of services and This whitepaper focuses on the design of IMS billing strategies will be described together with architecture for the extension of 2G/3G mobile the description of a best-practice networks to the Internet Video and VoIP users. implementation. Scenario Benefits During the past few years telecom networks have New revenue streams coming from video been highly fast shaping environments; calls, both from 3G mobiles and video- technology evolves very quickly and the highly enabled PCs. competitive scenario demands for the continuous Both Pc and mobile users get accustomed to offering of new services. 3G services Only few of such new services become killer New internet customer base applications but these killer applications change 2G users get motivated to leverage their very quickly the spending habits of the end user. service plan to the feature-rich 3G world The recent advent of network convergence is Reduce churn, remaining closer to the starting to bridge three segments that were customer with new and exciting services. traditionally isolated: fixed voice, mobile voice and IP services. Nowadays end users rely on their Internet Step 1 - Planning connection to place phone calls and on their How are customers billed? mobile phone to connect to the Internet; There are three ways an operator can offer the moreover voice services revenues are declining 3G-to-PC convergence service: faster than expected and the ARPU is being Inbound only: PC users can receive video driven by value added services. calls, but are not allowed to place calls. This scenario is both a challenge and an This way, 3G mobile calls are charged as opportunity for carriers and service providers; usual. This model is often used when the success is about being able to offer the ability to connect to the service is offered forthcoming killer application and follow the also outside the operator’s customer base. 2
  3. 3. Whitepaper: IMS architecture for 3G Mobile and PC audio/video convergence Inbound/outbound: both mobile and PC Easy installation users can place video calls. Outbound calls Zero configuration for the user originated by PCs generate CDR in the 3G Security with authentication, authorization gateway, connection is allowed only and classes of service management between operator’s customers or extended Privacy through media encryption to non-subscribers via prepaid credits Audio and Video quality Inbound/outbound with number mobility: Administrative feature to control the user the same number is assigned to 3G and PC base and avoid abuses terminal, and calls can be routed Brand recognition through customizable user accordingly to user’s preferences. interface Automatic provisioning and integration with The service provider, when designing the service legacy backend systems can choose between these possibilities or decide Automatic network recognition and NAT- to mix the three of them and use different firewall traversal solution classes of service. For example, the service How to protect privacy and meet regulations? provider can choose to provide inbound only To be comparable with standard mobile and capabilities to non-subscribers while allowing fixed phone services VOIP communications must both Inbound and Outbound calls to subscribers. prove to be compliant with the security and How are phone numbers assigned? privacy standards required by massively Each registered PC user has a personal number deployed end user services: assigned from a predefined numbering range. Users must be authenticated in order to be Operators can choose to reserve a dedicated tracked and billed range of their public numbering plan to video- Transported media must be encrypted in enabled PC, rather than assign network private order to protect privacy even when using addressing; moreover, dedicated numbering the open and insecure Internet network plans are already available in most countries for Regulatory requirements (such as lawful Video and VoIP terminals. interception) must be implemented An advanced option is to allow actual subscribers How to avoid network configuration problems? to share the same number between mobile Difficult configuration is probably the main handset and PC softphone (number mobility). reason that prevents mass adoption of IP-based What software is required? telephony. Most commercial and non commercial In order to enable the Internet users to place solutions require the end user to edit complex audio and video calls the installation of a configurations and provide cryptic feedback to specific software (softphone) is required; this configuration problems. This issue can be software makes use of PC multimedia resources addressed with more advanced solutions which (audio card, webcam, and microphone) and act provide automatic network configuration and as a terminal to interact with 3G mobiles and require the end user to simply log-in using his other PCs. credential. When choosing the softphone software a number Moreover, the wide spread of appliances for of features should be taken into account, connecting and protecting domestic networks including: (routers/access points/firewalls) block standard 3
  4. 4. Whitepaper: IMS architecture for 3G Mobile and PC audio/video convergence IP-multimedia applications. To overcome this IMS Terminals problem, automatic network discovery and In the proposed solution there are two different Firewall/NAT traversal solutions should be used. set of IMS Terminals; the first set is made up of the Software Endpoints distributed to the internet user base in order to gain access to the Step 2 – Architecture service provider’s network. engineering The second set of terminals are the IMS enabled mobile phones; these terminals are not required IMS Standards and architectures for the architecture to be complete, but are very The IP Multimedia Subsystem (IMS) likely to become part of any IMS powered standardization process is an effort toward a network in the near future. common usage of protocols and architectures for the next generation of convergent IP networks. P-CSCF: Session Border Controller The adoption of IMS compliant architectures The P-CSCF is the first point of contact for the provides a number of benefits including: IMS terminals. In this specific scenario, the first Interoperability, both cross-carrier and P-CSCF acts as a Session Border Controller (SBC) cross-vendor in order to link the internet (the visited network) Proven scalable architecture with the service provider IMS network (the home Support for advanced services such as network). presence management, flexible billing, The SBC provides the following functionalities: authentication, multi access channels, Network isolation privacy and security NAT and firewall traversal handling Architecture reuse and faster time-to- Authentication and authorization market The second P-CSCF is the IMS enabled base Figure 1 shows the diagram of the proposed station; once again this network element is not architecture including: required in current network but is very likely to have it deployed in the next future. Home Network Radio IP Network IMS Enabled P-CSCF IMS Enabled Terminals Basestations Internet P-CSCF IMS Enabled SCFCF/HSS/... Internet Session Border Internet Operator core network Controller Terminals RF CS Network MGCF/MGW Voice/H.324m to IP-IMS Gateway Legacy CS Terminals Figure 1 4
  5. 5. Whitepaper: IMS architecture for 3G Mobile and PC audio/video convergence MGCF/MGW: 3G Gateway only client for real time communication The 3G Gateway is the network element bridging specifically designed to be deployed by service the gap between legacy Circuit Switched UMTS providers in order to offer Audio and Video telephone systems and Packet Switched IP IMS services over private and public networks. networks. Mirial Softphone supports both audio and video The most important features of such gateways conversations at bitrates ranging from 20kbps to are: 1280kbps and is compatible and field proven Circuit switched interfaces (ISDN PRI and/or with almost every audio/video terminal SS7 ISUP) supporting H.323, SIP or H.324m. 3GPP-324m / H.324m compliance Mirial Softphone includes a number of features Audio transcoding (AMR to internet-friendly specifically designed for service providers such codecs) as: Advanced call routing functionalities Automated provisioning and distribution Fault tolerance and scalability Single click installation (no configuration 3GPP IMS Signalling compliance (SIP) required) Provisioning API for easy integration with customer’s users database Step 3 – Implementation High quality audio with wideband codecs, This paragraph introduces a best-practice automatic gain control and advanced implementation for the proposed architecture Acoustic Echo Cancellation based on Mirial equipment. High quality video with support for H.261, Mirial Softphone H263++, H.264, up to 30fps and 4CIF Mirial Softphone is the most advanced software resolutions (704x576 pixel) Figure 2 5
  6. 6. Whitepaper: IMS architecture for 3G Mobile and PC audio/video convergence Integration with network elements like PSE 3G Gateway provides the following Voice and Video Mail, Multi Conference Units functionalities: and centralized address book Embedded Video IVR (Address Book / Dial Extension) MCS Enables PC to 3G handsets videocalls and MCS is a network viceversa element specifically Enables 3G users to participate in IP designed to manage multiconferences and control wide installations of Mirial soft Enables different 3G video services such as phones. 3G video portal MCS is targeted to Video and Voice over IP 3G video mail service providers willing to offer their 3G video contact center subscribers the smoothest visual communication 3G video streaming experience in the simplest and most effective 3G video blog way. 3G video chat / dating MCS provides the following functionalities: Support for H.323 and SIP on IP networks Automatic Mirial Softphone configuration (no Embedded gatekeeper need for the user to enter confusing network Vertical and horizontal scalability parameters and address) Compact appliance (1RU), small footprint Authentication management both with internal or external user database SIP Proxy and optionally registrar for Need more information? streamlined deployments You can find more information on Mirial products Firewall/NAT traversal and automatic and other solutions whitepaper on our website: network discovery http://www.mirial.com Mirial automatic update management If you have any question or want to be contacted Mirial PSE 3G Gateway by one of our sales representatives, please send PSE 3G Gateway is a an email to: network element sales@mirial.com enabling the connectivity between 3G and IP networks. It supports industry standard protocols including ISUP or PRI interfaces, and interoperates with all 3G handsets and terminals he PSE 3G Gateway connects Voice and 3GPP-324m networks to SIP/IMS/H.323 networks. PSE 3G Gateway is perfectly suited for mission critical deployments and implements fault- tolerance, cluster configurations, service monitoring via SNMP and comprehensive CDR generation. 6
  7. 7. Whitepaper: IMS architecture for 3G Mobile and PC audio/video convergence www.mirial.com Copyright (c) 2007 Mirial S.r.l. (formerly DyLogic) - All rights reserved. No part of this work may be reproduced, stored in a retrieval system, adopted or transmitted in any form or by any means, electronic, mechanical, photographic, graphic, optic recording or otherwise, translated in any language or computer language, without the prior written permission of Mirial. Due care has been taken to make this Document as accurate as possible. However, Mirial makes no representation or warranties with respect to the contents hereof and shall not be responsible for any loss or damage caused to the user by the direct or indirect use of this Document. Furthermore, Mirial reserves the right to alter, modify or otherwise change in any manner the content hereof, without obligation of Mirial to notify any person of such revision or changes. All company and product names are trademarks of the respective companies with which they are associated. 7