An ad hoc network is a collection of wireless mobile hosts forming a temporary network without the aid of any established infrastructure or centralized administration. In such an environment, it may be necessary for one mobile host to enlist the aid of other hosts in forwarding a packet to its destination, due to the limited range of each mobile host’s wireless transmissions. This paper presents a protocol for routing in ad hoc networks that uses dynamic source routing. The protocol adapts quickly to routing changes when host movement is frequent, yet requires little or no overhead during periods in which hosts move less frequently. Based on results from a packet-level simulation of mobile hosts operating in an ad hoc network, the protocol performs well over a variety of environmental conditions such as host density and movement rates. For all but the highest rates of host movement simulated, the overhead of the protocol is quite low, falling to just 1 % of total data packets transmitted for moderate movement rates in a network of 24 mobile hosts. In all cases, the difference in length between the routes used and the optimal route lengths is negligible, and in most cases, route lengths are on average within a factor of 1.01 of optimal. 1.

An ad hoc network is a collection of wireless mobile hosts forming a temporary network withoutthe aid of any centralized administration or standard support services. In such an environment, it may be necessary for one mobile host to enlist the aid of others in forwarding a packet to its destination, due to the limited propagation range of each mobile host's wireless transmissions. Some previous attempts have been made to use conventional routing protocols for routing in ad hoc networks, treating each mobile host as a router. This position paper points out a number of problems with this design and suggests a new approach based on separate route discovery and route maintenance protocols.

Abstract new address must be edited into various configuration ” files. This paper describes a new protocol for transparently rout-ing packets to mobile hosts operating in a large internet-work. The protocol, called the Mobile Host Routing Proto-col (MHRP), allows any host to become mobile at any time, yet there is no penalty for a host being “mobile capable,” since the protocol automatically uses only the standard in-ternetwork routing mechanisms and adds no overhead when a mobile host is currently connected to its home network. The paper concentrates on the design of MHRP as it ap-plies to the Internet using IP. Mobile hosts use only their “home ’ ’ IP addresses, regardless of their current location in the Internet. No changes are required in stationary hosts that communicate with mobile hosts, and no changes are required in mobile hosts above the IP level. MHRP intro-duces several new features to provide better robustness for routing to mobile hosts, and provides better scalability to very large numbers of mobile hosts than previous mobile host protocols. 1.

In this paper we will show the ideas that are the foundation for the Borderland architecture. We have looked at two views of how researchers are thinking about computers in the future, wearable computers and pervasive computing. Wearable computers is the view where the user is wearing a computer and by that augment the user's view on his environment with additional digital information. Wearable computers have their strength in that they mostly do not have any requirements on the environment and that the user is in control of his integrity and security.

This paper describes an approach to mobile internetworking that allows hosts to move around an internet in a fashion transparent to transport layer protocols. The architecture is well-modularized and provides sufficient flexibility and generality. The flexibility enables graceful introduction of mobility into the existing infrastructure. The generality makes the architecture well-suitable for a wide range of practical applications. 1 Introduction Advances in telecommunications enable new paradigms in distributed computing. One of these paradigms is the emergence of mobile computing, where computers are no longer attached to a network at fixed points, but rather dynamically change their points of attachements. Among the key functions that need to be supported in order to make mobile computing widely acceptable is the ability to run distributed networking applications in a non-disruptive fashion while allowing hosts running these applications to change their attachment points to ...