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1 All rights reserved © 2001, Alcatel, Paris. Information Document 7-E ITU-T Study Group 2 January 2002 QUESTIONS:ALL SOURCE:TSB TITLE:TELECOM NETWORK MIGRATION TO IP AND ITS IMPACT ON THE FUTURE OF TELECOMMUNICATIONS (by Souheil MARINE) This is a powerpoint version of Information Document number 8.
2 All rights reserved © 2001, Alcatel, Paris. Telecom network migration to IP and its impact on the future of telecommunications Souheil MARINE Informal meeting with SPU of ITU, Geneva, Dec 12 2001
3 All rights reserved © 2001, Alcatel, Paris. The current situation in developed economies Ubiquitous telecom network for person to person communication Primary access mean to the Internet for private users Volume of data traffic transported over the telecom infrastructure in many countries overstepped the one used for voice but.. Still, an incentive for convergence at transport level between voice and data services exist in the short to medium term Revenue is still by far dominantly from the voice traffic But at what cost ? For what services ? And, most important, how the new network looks like ?
4 All rights reserved © 2001, Alcatel, Paris. On the opposite in developing economies Lack of access to the Internet mainly as a consequence of undeveloped telecom infrastructure Telecom and Digital divide closely related IP Telephony seen as a threat to revenue due to heavy reliance on settlement rates drawn from International traffic Consequence of limited national/local traffic due to lack of telecom network development No way out from this situation without improving access to network For what services to justify investment ? Leapfrog to IP before or simultaneously as in developing countries ? Lack of basic telecom infrastructure
5 All rights reserved © 2001, Alcatel, Paris. Some of Todays Assumptions IP is the future technology for world-wide networks used for all kinds of communication (person-to-person, data, multimedia,..) IP networks expansion help reduce the digital divide IP telephony is more cost-efficient than legacy TDM IP telephony should not fall under the current telecom regulation framework
6 All rights reserved © 2001, Alcatel, Paris. Extra thought is needed Internet and IP network technology certainly offer great opportunities for new services and new development prospects BUT, prior to tearing down the old world of telephony, we could usefully: Compare its model with the data network model (from which IP technology originated) Highlight differences between both models beyond the specifics of the transport technology
7 All rights reserved © 2001, Alcatel, Paris. Comparison Framework (1) Data NetworksTelecom Networks Two-party communication model (client/server or peer-to-peer) Three-party communication model (caller-network-called) Network engines focus on transport of user streams. Control stream exchanged between communication applications hosted at users premises with the help of servers that do not interfere with transport level. Network engines relay user service request for a communication application under their control. Transport of user stream closely linked with the communication application control Control Stream User Stream
8 All rights reserved © 2001, Alcatel, Paris. Comparison Framework (2) No direct control by network over the communication except access rights Communication controlled (managed) by the network Data NetworksTelecom Networks Network engines only control the user access rights to send data over the network. Application workability delegated to appropriate servers (if any) on a per- application basis. Network engines control the user access based on his access right to the specific communication application provided by the network. User streams only sent over the network when access to the application is enabled Control Stream User Stream Server Cooperative control of an application access Control of conformance to an agreed SLA Application level control conditions sending of subsequent user flows
9 All rights reserved © 2001, Alcatel, Paris. Comparison Framework (3) Communicating users agree on which communication protocol Communication protocols are network specific and transparent to users Data NetworksTelecom Networks End-to-end Protocol P1 agreed between users on a per-application basis. P1 may also involve the interaction with the server supporting that specific communication application. Protocol P1invoked by end-user to express/receive communication requests to/from the network. Protocol P2 is internal to the network and used to relay communication requests between network entities. Control Stream User Stream Server P1 P2 P1
10 All rights reserved © 2001, Alcatel, Paris. Comparison Framework (4) Data NetworksTelecom Networks User-defined QoS constraints provided to the network QoS constraints of a communication known and guaranteed by the network SLA Sub-network SLA UNI Sub-network NNI UNI Service Level Agreement (SLA) determine the quality of user traffic that can be handled both at user/network interfaces and between sub-networks. SLA are independent from any specific application. Overall resulting quality of service between end-users tributary of correct routing over appropriate links. User Network Interface (UNI) allows a user to request a network service from a sub-network operator. Network to network Interfaces (NNI) allow sub-networks to relay service requests. Acceptance of a request at UNI or NNI level involves appropriate resource reservation for its proper completion up to the next hop.
11 All rights reserved © 2001, Alcatel, Paris. Comparison Framework (5) Data NetworksTelecom Networks Communication can be universal but no network interconnect mandatory at service level Universality of communication service through interconnect agreements between sub-network operators Sub-network Server End-users interconnection ensured on an application per-application basis through appropriate servers. Transport-level interconnection is a necessary but not sufficient condition for application level one. End-users interconnection ensured because of the mere existence of interconnect agreement between their respective sub- network operators. Application and transport level interconnections are closely related.
12 All rights reserved © 2001, Alcatel, Paris. Comparison Framework (6) Data NetworksTelecom Networks Charging based on flat rate or volume of transported data Charging based on usage of the communication service Sub-Network operator levies a fee to end-users corresponding to the actual amount of traffic sent irrespective of any application. Charge depends only on the quality of the SLA. Sub-Network operator levies a fee to end-users corresponding to the services used in a way not directly related to the amount of traffic they had generated (end-user may not even be aware of it). Time based charging is strictly a matter of service offering - not technology dependent Compensation between operators based on service components relayed in each respective direction. Compensation between sub-network operators based on volume of transported data not on the nature of the supported applications.
13 All rights reserved © 2001, Alcatel, Paris. What Convergence between Data and Telecom models Future converged networks would still be economically based on the provision of person-to-person communication services Convergence will occur only if it allows new services and not - still to be proven reduced costs - for equivalent services ! Gradual access improvement and diversification plus migration of the network transport infrastructure financed by converged voice and data service in the short term new breed of multimedia services in the mid/long term still keeping interoperability with legacy infrastructure to ensure universal communication service
14 All rights reserved © 2001, Alcatel, Paris. What a converged telecom network looks like Offers a diversified - wireline and wireless - high bandwidth and in native packet mode access to the network. Offers at least multimedia inter-personal communication services to its subscribers Allows provision of third-party brokered - i.e., with good quality - services as well as free Internet services where operator role is limited to transport provision
15 All rights reserved © 2001, Alcatel, Paris. What might happen in the coming years Development of new access technologies (or upgrade of fixed access through xDSL) to provide broadband access possible leapfrog by developing countries if revenues drawn from voice service cover the investment Leverage by incumbents and new comers on improved access to offer bundled data and telecom services a la telecom model way Gradual deployment of multimedia services when access and network migration over a packet transport completed Gradual migration of core network transport infrastructure to a packet (or IP) technology
16 All rights reserved © 2001, Alcatel, Paris. Conclusions IP or packet transport technology will progressively integrate telecommunication networks but... The path to next-generation networks is technically and economically feasible through the telecom model Networks are not determined by their technology but by the services they do provide and the way they provide them ! The upcoming next-generation telecommunication networks will still be based on person to person communication services
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