Trust model for certificate revocation in Ad hoc networks

In this paper we propose a distributed trust model for certificate revocation in Adhoc networks. The proposed model allows trust to be built over time as the number of interactions between nodes increase. Furthermore, trust in a node is defined not only in terms of its potential for maliciousness, but also in terms of the quality of the service it provides. Trust in nodes where there is little or no history of interactions is determined by recommendations from other nodes. If the nodes in the network are selfish, trust is obtained by an exchange of portfolios. Bayesian networks form the underlying basis for this model

Advanced IPv6 mobility management for next generation wireless access networks

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Operational and Fairness Issues with Connection-less Traffic over IEEE802.11b

The IEEE802.11 group has recently ratified high rate (HR) extensions to enable high speed wireless communications over WLANs. The HR extensions specified in revision IEEE802.11b, encompass mainly new RF modulation schemes. This paper attempts an experimental evaluation of the performance characteristics of 802.11b in terms of throughput and loss over high speed transmission rates with respect to connection-less network traffic. We present a simple analysis of the protocol's throughput capacity over high speed rates while we reveal fundamental design considerations that prevent 802.11b from reaching its true throughput potentials in the light of rate adaptivity. We further recommend some extensions to the Medium Access Control (MAC) protocol sub-layer that reconsider the multi-rate compatibility requirement while maintaining fairness in throughput between nodes at short or long distances within range from a Base Station (BS). The recommendations subject to simulations as work in-progress, expect to effect improvements in throughput over a proportionally-fair rate fallback scheme, in the order of 15% for transmission rates of 11 Mbps.We also provide some key observations to enable efficient protocol design for adaptive mobile environments

A Model of Seamless IP Mobility for Future Wireless Access Networks

This paper presents an architecture and protocol in support of seamless mobility for future IP Radio Access Networks (IPRANs) . It encompasses a novel approach for seamless handoff and proactive relocation of IP roaming state. The latter establishes a generic substrate for proactive state relocation of different context classes relating to the state of IP connectivity for a mobile node (MN)

Proactive Mobility for future IP Wireless Access Networks

This paper presents an architecture and protocol in support of proactive mobility for future IP Wireless Access Networks (IP-WANs). It encompasses a novel approach for seamless handoff and proactive relocation of IP roaming state. The latter establishes a generic substrate for proactive state relocation of different context classes relating to the state of IP connectivity for a mobile node (MN). To addres

Performance Issues for Localised IP Mobility Management

Base IP mobility presents performance limitations when the mobile host increases its handoff rate between successive wireless points of attachment as a result of its mobility pattern. These limitations are augmented when latency externalities such as the round trip time between the MN and its peers, add to the total of latency and signalling overhead, impeding the performance of the mobility function. To alleviate that, IP mobility management has been extended by localised IP mobility management functions focusing within the context of micromobility. This pape