Wireless Future - Telenor

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82 5 References 1 CEPT. ERC Decision of 29 November 1999 on the harmonised frequency bands to be designated for the introduction of High Performance Radio Local Area Networks (HIPERLANs). (CEPT/ERC Decision (99)23.) 2 Khun-Jush, J et al. HIPERLAN type 2 for broadband wireless communication. Ericsson Review, 2, 108–119, 2000. 3 Johnsson, M. HiperLAN/2 – The Broadband Radio Transmission Technology Operating in the 5 GHz frequency Band. HiperLAN/2 Global Forum, Version 1.0, 1999. 4 ETSI. Broadband Radio Access Networks (BRAN); HIPERLAN Type 2; System Overview. Sophia Antipolis, 2000. (ETSI TR 101 683.) 5 ETSI. Broadband Radio Access Networks (BRAN); HIPERLAN Type 2; Physical (PHY) layer. Sophia Antipolis, 2000. (ETSI TS 101 475.) 6 Khun-Jush, J et al. Link performance of the HIPERLAN/2 Physical Layer in fading Environments. In: Proceedings of the European Wireless ’99, Munich, 145–149, 1999. 7 Kluge, K. Effect of Link adaption on Overall Capacity in HIPERLAN Systems. In: Proceedings of the European Wireless ’99, Munich, 163–167, 1999. 8 ETSI. Broadband Radio Access Networks (BRAN); HIPERLAN Type 2; Data Link Control (DLC) layer; Part 1: Basic Data Transport Functions. Sophia Antipolis, 2000. (ETSI TS 101 761-1.) 9 ETSI. Broadband Radio Access Networks (BRAN); HIPERLAN Type 2; Data Link Control (DLC) layer; Part 2: Radio Link Control (RLC) Sublayer. Sophia Antipolis, 2000. (ETSI TS 101 761-2.) 10 ETSI. Broadband Radio Access Networks (BRAN); HIPERLAN Type 2; Packet based Convergence Layer; Part 1: Common Part. Sophia Antipolis, 2000. (ETSI TS 101 493- 1.) 11 ETSI. Broadband Radio Access Networks (BRAN); HIPERLAN Type 2; Cell based Convergence Layer Part 1: Common Part. Sophia Antipolis, 2000. (ETSI TS 101 763- 1.) 12 Kadelka, A, Hettich, A, Dick, S. Performance Evaluation of the MAC Protocol of the ETSI BRAN HIPERLAN/2 Standard. In: Proceedings of the European Wireless ’99, Munich, 157–162, 1999. Telektronikk 1.2001
Frederic Paint (27) has been working for Telenor R&D since his graduation from ENST Paris (telecom engineering school) in 1998. His work has focused on 3G core networks and their evolution. This effort included participation in research projects (e.g. Eurescom P920 and Eurescom P1013) and standardisation activities (3GPP). More recently he has been involved in the field of mobility in IP networks specifically on micro-mobility support and inter-access mobility. frederic.paint@telenor.com Geir Egeland (34) is Research Scientist at Telenor R&D, where he has been employed since 1997. He has been working with Mobile IPv4 and Mobile IPv6, Service Discovery Protocols, TCP performance in wireless networks and the Next Generation Inernet Protocol (IPv6). His current research interests are mobile ad-hoc networks, Peerto-Peer Computing and IPv6 networks. geir.egeland@telenor.com Telektronikk 1.2001 Seamless Mobility in IP Networks FREDERIC PAINT AND GEIR EGELAND Mobile computing has gained considerable interest in the past few years. Maintaining secure IP connectivity as well as having transparent access to computing devices while moving across networks is a challenging problem being addressed in the Computing Industry. The operators are also looking at the IP mobility problem as they see the “all IP” as the enabler of true convergence. In particular the Cellular Industry is now considering architectures whereby base stations become IP enabled. In that context, mobility support in IP becomes even more challenging. The purpose of this paper is to review the solutions being designed in the IETF to provide IP mobility support. Specifically we give some insight into the Mobile IP protocol and IP micromobility schemes as well as discussing the future developments of IP mobility support in the Internet Community. 1 Introduction Today there is a considerable contrast between the mobile services provided in cellular networks and mobile services for Internet access. Although the Internet offers access to information sources world-wide, typically we do not expect to benefit from that access until we arrive at some familiar point such as the home, office or school. Being able to do mobile computing in the same way as in cellular networks offers many advantages. Access to the Internet anytime, anywhere will free us from being tied to our desktop. Having the Internet available to us as we move will give us the tools to build computing environments wherever we go, thus changing the very way we work. Mobile computing and networking should not be confused with portable computing and networking that we have today. In mobile networking, computing activities are not disrupted when the user changes the computer’s point of attachment to the Internet. Instead, all the needed reconnection occurs automatically and non-interactively. Already solutions exist to provide ISP users the possibility to roam to other countries and use the local ISP’s Internet access services. Such solutions provide support for portability. In other scenarios such as that of Wireless LAN access to IP networks, movement across IP subnets should be transparent to a user having ongoing communications. The Mobile IP standard provides that capability by making the mobility between subnets transparent to upper layers such as TCP, maintaining existing transport-layer connections. Furthermore users can continuously use a single IP address independently of their point of attachment, thus providing simple means for a mobile node to be reachable for other corresponding hosts. The cellular industry is now considering employing IP up to the base stations for the sake of cost reduction. In that context questions have been raised as to whether Mobile IP scales well for micro-mobility, and in particular whether it can efficiently support fast handoffs. Several IP micro-mobility schemes extending or interworking with Mobile IP have been proposed in the mobileip working group of the IETF to provide better support of micro-mobility. These schemes focus primarily on solving the signalling latency introduced by mobile IP when roaming between subnets. The purpose of this paper is to give some insights into Mobile IP and IP micro-mobility schemes as well as discussing the future developments of IP mobility in the Internet Community. The paper is organised as follows: First we present the Mobile IP protocol for IPv4 and IPv6 and its recent enhancements. Then we describe schemes proposed in the IETF for solving the micro-mobility and discuss their deficiencies. Finally we discuss the future development of IP mobility. 1.1 Acronyms AAA Authentication, Authorisation, Accounting ACOA Alternative Care-of Address BS Base Station BU Binding Update CH Correspondent Host CIP Cellular IP COA Care-of Address DNS Domain Name Service DRR Domain Root Router FA Foreign Agent GFA General Foreign Agent GW Gateway HA Home Agent 83
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Telektronikk Volume 97 No. 1 - 2001
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Per Hjalmar Lehne (42) obtained his
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Stein Svaet (41) is Senior Research
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Pbit/day 6 150 125 100 75 50 25 0 F
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8 Video communication as a utility
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10 The idea of reconfigurable mobil
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12 Switched lobe Dynamically phased
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Figure 10 The All IP vision Figure
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Jorge Pereira (40) obtained his Eng
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(Millions) Figure 1 Exponential gro
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24 Defining Generation based upon D
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Multi-mode Terminal by Software Rad
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distribution layer possible return
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30 A Co-Ordinated Approach to 4G As
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Figure 2 Needs and Related Services
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134 Telektronikk 1.2001
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