Hierarchical Mobile IPv6是IETF組織為了解決Mobile
IPv6過多的Binding Update訊號量所提出的移動管理(Mobility
Management)機制。當一個網路中有多個MAP(Mobility Anchor
Point)存在時，因為MN(Mobile Node)無法有效知道相關網路的
訊息，所以容易造成過多的MN選擇某特定MAP建立binding。使
得整體網路出現瓶頸問題，既而衍生出其它降低通訊品質的問題
。
相關文獻雖對此問題有所改善，但多數以降低Binding Update
訊號量主要目標，而忽略了建立binding時失敗的可能性。當MN
在通訊中需要重新對不同MAP建立binding時，若不能在第一時
間內完成整個BU程序，就會遭受到類似call dropping的問題。
即使有再好的QoS機制，也無法提昇整體的通訊品質。
本文試著提出改善的MAP選擇機制，以減少binding建立失
敗為主要目標，接著；再進一步討論其可能減少的Binding Update
訊號量與MAP間負載平衡(load balancing)等問題。

[1] D. Johnson, C. Perkins and J. Arkko, “Mobility Support in IPv6”,
RFC 3775.
[2] H. Soliman, C. Catelluccia, K. El Malki and L. Bellier, “Hierarchical
Mobile IPv6 mobility management (HMIPv6)”, Internet Draft, IETF,
draft-ietf-mipshop-hmipv6-01.txt (work in progress), February 2004.
[3] T. Narten, E. Nordmark and W. Simpson, “Neighbour Discovery for
IP version 6”, RFC 2461.
[4] S. Deering and B. Hinden, “Internet Protocol version 6 (IPv6)
specification”, RFC 2460.
[5] M. Crawford, “Router Renumbering for IPv6”, RFC 2984.
[6] J. Xie and I. F. Akyildiz, “A novel distributed dynamic location
management scheme for minimizing signaling costs in Mobile IP”
, IEEE Trans. on Mobile Computing, Vol. 1, No. 3, pp. 163-175,
July-September 2002.
[7] Y. J. Lee and I. F. Akyildiz, “A new scheme for reducing link and
signaling costs in Mobile IP”, IEEE Trans. on Computers, Vol. 5,
No. 6, pp. 706-711, June 2003.
[8] T. Pagtzis, C. Williams, C. Perkins and P. Kirstein, “Requirements
for localized IP mobility management”, Wireless Communications
and Networking, 2003. WCNC 2003. 2003 IEEE, Vol. 3, pp. 1979-
1986, March 2003.
[9] K. Kawano, K. Kinoshita and K. Murakami, “A multilevel
hierarchical distributed IP mobility management scheme for wide
area networks”, in Proc. of International Conference on Computer
Communications and Networks (ICCCN’ 02), pp. 480-484, October
2002.
[10] M. Bandai and I. Sasase, “A load balancing mobility management
for multilevel Hierarchical Mobile IPv6 networks”, in Proc. of
Personal, Indoor and Mobile Radio Communications, 2003. PIMRC
2003. 14th IEEE, Vol. 1, pp. 460-464, September 2003.
[11] X. Pérez-Costa and M. Torrent-Moreno, “A performance study of
Hierarchical Mobile IPv6 from a system perspective”,
Communications, 2003. ICC ''03. IEEE International Conference on,
Vol.1, pp. 468-474, May 2003.
[12] S. H. Hwang, B. K. Lee, Y. H. Han and C. S. Hwang, “An adaptive
Hierarchical Mobile IPv6 with route optimization”, Vehicular
Technology Conference, 2003. VTC 2003-Spring. The 57th IEEE
Semiannual, Vol. 3, pp. 1502-1506, April 2003.
[13] S. Pack and Y. Choi, “Performance analysis of Hierarchical Mobile
IPv6 in IP-based cellular networks”, in Proc. of Personal, Indoor
and Mobile Radio Communications, 2003. PIMRC 2003. 14th IEEE
, Vol. 3, pp. 2818-2822, September 2003.
[14] E. Jugl and H. Boche, “Dwell time models for wireless
communication systems”, Vehicular Technology Conference, 1999.
VTC 1999 - Fall. IEEE VTS 50th, Vol. 5, pp. 2984-2988, September
1999.
[15] P. V. Orlik and S. S. Rappaport, “A model for teletraffic performance
and channel holding time characterization in wireless cellular
communication with general session and dwell time distributions”,
Selected Areas in Communications, IEEE Journal on, Vol. 16, pp.
788-803, June 1998.
[16] C. Bettstetter, “Smooth is better than sharp: a random mobility
model for simulation of wireless networks”, in Proc. of ACM
International Workshop on Modeling, Analysis and Simulation of
Wireless and Mobile Systems (MSWiM’01), pp. 19-27, July 2001.
[17] Y. Fang, “Hyper-Erlang distribution model and its application in
wireless mobile networks”, Wireless Network(7), pp.211-219, 2001.
[18] A. M. Law and W. D. Kelton, Simulation modeling and analysis,
McGraw-Hill, 3rd Ed. 2000.
[19] Leonard Kleinrock, Queueing systems volume 1: Theory, John
Wiley & Sons, 1975.
[20] Mark A. Miller, Implementing IPv6, M&T Books, 1999.