INTERNET DRAFT Behcet Sarikaya Category: Informational Alcatel Title: draft-sarikaya-seamoby-paging-requirements-00.txt Date: February 2001 Requirements for a Layer 3 Paging Protocol Status of this Memo This document is an individual contribution for the Seamoby Working Group. Distribution of this memo is unlimited. This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. 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." The list of current Internet-Drafts can be accessed at: http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at: http://www.ietf.org/shadow.html. Copyright (C) The Internet Society 2000. All Rights Reserved. Abstract This document develops a set of requirements needed to support the mobile nodes that are in the dormant mode by way of a Layer 3 (L3) paging protocol for seamless IP mobility. This draft describes paging, and presents a list of requirements regarding work on developing a L3 paging protocol. Table of Contents 1.0 Introduction............................................2 2.0 Definitions.............................................2 3.0 Advantages of Dormant Mode..............................3 Behcet Sarikaya expires August 2001 [Page 1] INTERNET DRAFT February 2001 4.0 Requirements............................................4 5.0 Security Considerations.................................4 6.0 IANA Considerations....................................4 7.0 References..............................................4 8.0 Author's Address........................................5 9.0 Full Copyright Statement................................5 1.0 Introduction Many existing radio link protocols and mobile systems support location of and radio link establishment with mobile nodes that are not actively listening for delivery of IP packets. This functionality allows mobile nodes to reduce power consumption and decreases signalling load on the network for tracking mobiles that are not actively participating in IP packet generation or reception. When a mobile is in low power consumption mode, special steps need to be taken to locate the mobile. These steps differ depending on the radio link, but the generic name for this process is paging. In this document, after some initial definitions, the requirements related to establishing the paging protocol as an extension to the base Mobile IPv4 [1] and Mobile IPv6 [2] protocols and their respective extensions for regional registrations [3] and [4] are stated. 2.0 Definitions The following definitions are relevant with respect to the paging: Dormant Mode - A state in which a mobile node (MN) does not send or receive IP packets. MN enters the dormant mode if it has not had any communication with external IP nodes for a time period that is determined by MN. The behaviour of MN in the dormant mode is specified by the paging protocol. Paging - As a consequence of a MN-bound packet destined for a MN currently in dormant mode, messaging directed to locating the mobile and establishing a last hop connection. This messaging is in addition to simply delivering the packet to the mobile, i.e. last hop routing of packets is NOT considered to be paging. Paging Area - Collection of last hop routers that are searched to locate a MN that is in the dormant mode. A paging area does not necessarily correspond to an IPv4/v6 subnet. 3.0 Advantages of Dormant Mode Dormant mode is advantageous to a MN for the following reasons: Behcet Sarikaya expires August 2001 [Page 2] INTERNET DRAFT February 2001 - Power savings. By reducing the amount of time the mobile is required to listen to L2, the drain on the mobile node's battery is reduced. - Reduced signalling for location tracking. By requiring the mobile to only signal when it crosses a paging area boundary rather than when it switches between L2 access points, the amount of signalling for tracking the mobile is reduced. - Reduced router state. The routers defined in [3] and [4] need not keep the MN in dormant mode in their binding caches. The paging protocol may identify a router that may keep the state in its binding cache on the dormant node MNs. 4.0 Requirements The following basic requirements are imposed upon any L3 paging protocol. The requirements of a MN that performs a handover when in dormant mode are stated in the next section. - The operation of MN in the dormant mode is the domain of any L3 paging protocol. - L3 paging protocol is not a stand-alone protocol, it MUST be defined as an extension of the base Mobile IPv4 [1] or the base Mobile IPv6 [2] protocol. - L3 paging protocol for a future micro mobility protocol to be developed is for further study. - L3 paging protocol SHOULD also extend any regional registration extensions of the base Mobile IPv4/v6 protocol, i.e. [3] or [4]. - L3 paging protocol MUST use L2 paging if available. - The dormant mode MN MUST receive and respond to periodic L3 messages called L3 pages designed to locate MN. The establishment of L2 connectivity in order to receive/ respond to L3 pages MUST enable significant power savings to warrant going to the dormant mode. - MN MUST inform the system before going into the dormant mode - If the paging state is to be kept in a single router, the paging protocol MUST clearly identify the steps to be taken in order to ensure a fail-safe mode of operation. Behcet Sarikaya expires August 2001 [Page 3] INTERNET DRAFT February 2001 4.1 Paging Areas The following are recognized as the requirements related to the paging areas: - The routers defined by the regional registration protocol may be organized into L3 paging areas. - An informational RFC may be issued defining the organization of the paging areas vis-a-vis IPv4/v6 subnets. - A dormant mode MN MUST receive the identification of the paging area in which it entered into the dormant mode. - A dormant mode MN SHOULD register when it changes the paging area. Such registrations may help establish fast handovers in IPv4 [5,7] and IPv6 [6]. 5.0 Security Considerations This type of non-protocol document does not directly affect the security of the Internet. 6.0 IANA Considerations This document does not directly affect IANA. 7.0 References [1] C. Perkins, editor. "IP Mobility Support", RFC 2002, October, 1996. [2] Johnson, D., and C. Perkins, "Mobility Support in IPv6", draft- ietf-mobileip-ipv6-13.txt, work in progress. [3] H. Soliman, C. Castelluccia, K. El-Malki, L. Bellier. "Hierarchical MIPv6 Mobility Management", draft-ietf-mobileip-hmipv6-02.txt, December 2000. [4] Gustafsson, E., et al., "Mobile IP Regional Registration", draft-ietf-mobileip-regtun-03.txt, July, 2000. [5] Calhoun, P., et. al., "Foreign Agent Assisted Hand-off", draft- calhoun-mobileip-proactive-fa-03.txt, work in progress. [6] Tsirtsis, G., Editor, "Fast Handovers for Mobile IPv6", draft- designteam-fast-mipv6-01.txt, work in progress. [7] Al Malki, K., Soliman, H., "Fast Handooffs in Mobile IPv4", draft-elmalki-mobileip-fast-handoffs-03.txt, work in progress. Behcet Sarikaya expires August 2001 [Page 4] INTERNET DRAFT February 2001 8.0 Author's Address Questions about this memo can be directed to: Behcet Sarikaya Alcatel USA M/S CTO2 1201 E. Campbell Rd. Richardson, TX 75081-1936 USA Tel: 1-972-996-5075 Fax: 1-972-996-5174 Email: Behcet.Sarikaya@usa.alcatel.com 9.0 Full Copyright Statement Copyright (C) The Internet Society (2000). All Rights Reserved. This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this docu- ment itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of develop- ing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English. The lim- ited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns. This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DIS- CLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE." Behcet Sarikaya expires August 2001 [Page 5]