ALTO W. Chen Internet Draft J. Peng Intended status: Informational Y. Zhang China Mobile Expires: January 2012 July 3, 2011 ALTO in Mobile and Wireless Network draft-chen-alto-in-mobile-wireless-network-00.txt Abstract As wireless access bandwidths increase quickly, Peer-to-Peer applications boom in mobile and wireless network and their traffic need to be optimized. This document deals with the scenario of ALTO where peers are connected through mobile or wireless network, like 3G, LTE and WLAN access network. It proposes the requirements and architecture of ALTO in mobile and wireless network. Status of this Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on January 3, 2012. Copyright Notice Copyright (c) 2011 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents Chen Expires January 1, 2012 [Page 1] Internet-Draft ALTO in Mobile and Wireless Network July 2011 (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Chen, et al. Expires January 4, 2012 [Page 2] Internet-Draft ALTO in Mobile and Wireless Network July 2011 Table of Contents 1. Introduction ................................................ 4 2. ALTO used in Mobile and wireless Network .....................5 2.1. Requirements of ALTO in Mobile and wireless Network .... 5 2.2. Architecture of ALTO in Mobile and wireless Network .... 5 3. Security Considerations...................................... 7 4. Acknowledgements ............................................ 7 5. Normative References......................................... 7 Chen, et al. Expires January 4, 2012 [Page 3] Internet-Draft ALTO in Mobile and Wireless Network July 2011 1. Introduction The present ALTO server can collect many properties about endpoints like connection type, geographical location, and others may be useful to applications in ALTO protocol[1]. However, the information mainly focuses on fixed broadband network. As wireless access bandwidths increase quickly, Peer-to-Peer applications spring up in mobile and wireless network. For example, they had been in top 3 of high traffic in 3G network of China Mobile and their traffic need to be optimized in mobile and wireless network. This document deals with the scenario of ALTO where peers are connected through wireless mobile network, like 3G, LTE and WLAN environments. Due to the scarcity and high dynamicity of wireless links, traffic optimization of mobile and wireless network is different from that of fixed broadband network. It proposes the requirements and architecture of ALTO in mobile and wireless network. Section 2 outlines the requirements and architecture of ALTO in mobile and wireless network. Chen, et al. Expires January 4, 2012 [Page 4] Internet-Draft ALTO in Mobile and Wireless Network July 2011 2. ALTO used in Mobile and wireless Network This section discusses the requirements and architecture of ALTO in mobile and wireless network. 2.1. Requirements of ALTO in Mobile and wireless Network In the fixed broadband network, ALTO hopes to localize P2P traffic to the full extent. However, in mobile and wireless network localizing P2P traffic would result in the imbalance between base stations' or wireless access points' load due to the scarcity of wireless resource i.e., some base stations or wireless access points have the congestion so as not to provide the P2P or other data service to other peers or terminals in that congested base stations or wireless access points. Therefore, ALTO should optimize P2P traffic to balance the load of base stations or wireless access points, except and more than to localize P2P traffic, in mobile network like 3G, LTE and WLAN access environments. It means that load information of base stations and wireless access points is one of important properties in ALTO protocol of mobile and wireless environments. Besides, high dynamicity of topology caused by mobility and wireless links in mobile and wireless network results that ALTO should handle the network topology and link information in a shorter lifetime than in the fixed broadband network. 2.2. Architecture of ALTO in Mobile and wireless Network Figure.1 shows the enhanced ALTO architecture in mobile and wireless network integrating mobile and wireless network information. ALTO server collects the information related on mobile and wireless network from specific mobile information source, like Host Location Register and Visitor Location Register (HLR/VLR), even Policy and Charging Rules Function(PCRF) in Policy and Charging Control(PCC) and so on. ALTO client(like a peer of P2P applications) or ALTO service discovery elements(like P2P tracker)sends ALTO query to ALTO server through the ALTO protocol to obtain the prior peers evaluated by mobile or wireless network information of ALTO server. +-------------------------------------------------------------------+ | | | | | +-----------+ +---------+ +--------+ | | |Specific | | | | | | Chen, et al. Expires January 4, 2012 [Page 5] Internet-Draft ALTO in Mobile and Wireless Network July 2011 | |mobile | | ALTO | ALTO Protocol | ALTO | | | |information|.......| Server | --------------- | Client | | | |Source,like| | | | | | | |HLR/VLR | +---------+ +--------+ | | +-----------+ \ * | | \ * | | \ +--------------+ | | \ ALTO Protocol | ALTO | | | -----------------| Service | | | | Discovery, | | | | like tracker | | | +--------------+ | | | +-------------------------------------------------------------------+ Figure 1: ALTO architecture in mobile and wireless network integrating mobile and wireless network information Chen, et al. Expires January 4, 2012 [Page 6] Internet-Draft ALTO in Mobile and Wireless Network July 2011 3. Security Considerations TBD 4. Acknowledgements TBD 5. Normative References [1] R. Alimi, Ed., R. Penno, Ed., Y. Yang, Ed." ALTO Protocol", June 2011, . Author's Addresses Wei Chen China Mobile Unit 2, 28 Xuanwumenxi Ave, Xuanwu District, Beijing 100053, China Email: chenweiyj@chinamobile.com Jin Peng China Mobile Unit 2, 28 Xuanwumenxi Ave, Xuanwu District, Beijing 100053, China Email: pengjin@chinamobile.com Yunfei Zhang China Mobile Unit 2, 28 Xuanwumenxi Ave, Xuanwu District, Beijing 100053, China Email: zhangyunfei@chinamobile.com Chen, et al. Expires January 4, 2012 [Page 7]