This document is an analysis of multihoming in the context of network mobility (NEMO) in IPv6. As there are many situations in which mobile networks may be multihomed, a taxonomy is proposed to classify the possible configurations. The possible deployment scenarios of multihomed mobile networks are described together with the associated issues when network mobility is supported by RFC 3963 (NEMO Basic Support). Recommendations are offered on how to address these issues. Ng, et al.

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In managing the locations of mobile users in mobile communication systems, the distance-based strategy has been proven to have better performance than other dynamic strategies, but is difficult to implement. In this paper, a simple approach is introduced to implement the distance-based strategy by using the cell coordinates in calculating the physical distance traveled. This approach has the advantages of being independent of the size, shape, and distribution of cells, as well as catering for the direction of movement in addition to the speed of each mobile terminal. An enhanced distance-based location management strategy is proposed to dynamically adjust the size and shape of location area for each individual mobile terminal according to the current speed and direction of movement. It can reduce the location management signaling traffic of the distance-based strategy by half when mobile terminals have predictable directions of movement. Three types of location updating schemes are discussed, namely, Circular Location Area, Optimal Location Area, and Elliptic Location Area. Paging schemes using searching techniques such as expanding distance search based on the last reported location and based on the predicted location, and expanding direction search are also explored to further reduce paging signal traffic by partitioning location areas into paging areas.

The multitier environment of mobile communication systems is an integration of different mobile systems such as cellular, cordless, and satellite systems for mobile users to communicate with anyone, anywhere, and anytime. An effective and efficient scheme is needed for mobile terminals to dynamically select the most appropriate tier of mobile system for optimizing communication cost and performance. This paper presents a model for studying the effect of level switching in a multitier environment and for the performance evaluation of level switching schemes. This model is based on the continuous-time stochastic process, which is parameterized by a set of state-transition rates and costs derived from the characteristics of the mobile systems and terminals. Several level switching schemes based on different triggering events are proposed and the performance is analyzed using the proposed model. Level switching is found to be an effective way to reduce communication costs. The performance gain increases with the frequency of the switching activities and the level switching costs are insignificant in most cases. By using the model, the most cost-effective switching scheme can be selected to match the characteristics of individual mobile users and mobile systems for optimizing overall system performance.

With the progress of wireless technologies today, mobile terminals with multiple access interfaces are emerging (e.g. laptops, Personal Digilal Assistants). However, multiple interfaces cannot yet he used simultaneously; nor can they be switched without breaking ongoing connections. This paper explores the benefits and issues of having multiple access interfaces when mobile nodes and networks employ layer-3 mobility protocols of Internet Protocol version 6 (IPv6) to access the Inlernet while changing their points of attachment to the Internet.To overcome some of the identified problems, we propoSe a tunnel re-establishment technique. Simulation results show that this technique would allow mobile nodes and networks to benefit from permanent (and even uninterrupted) accem to the Internet using different access technologies, without requiring special services provided by the access routers.