Topic
Ad hoc wireless distribution service
About: Ad hoc wireless distribution service is a research topic. Over the lifetime, 17734 publications have been published within this topic receiving 488205 citations.
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TL;DR: A stable weight-based on-demand routing protocol (SWORP) for MANETs is proposed and results show that the proposed SWORP outperforms DSR, A ODV, and AODV-RFC, especially in a high mobility environment.
77 citations
Proceedings Article•
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TL;DR: It is found that the impact of the interval timer grows with increased network mobility and node density, and the intervals for some message types (HELLO messages) have a bigger impact on OLSR performance than for other message types.
Abstract: Optimised Link State Routing (OLSR) is a popular protocol for use in MANET networks. In this paper, we investigate the different impacts of tuning refresh interval timers on OLSR performance under various scenarios (varying node density and node speed). Based on the simulation results with NS2, we find that although reducing refresh intervals could improve OLSR?s performance, the intervals for some message types (HELLO messages) have a bigger impact on OLSR performance than for other message types. We find that the impact of the interval timer grows with increased network mobility and node density.
77 citations
TL;DR: Concentrating on AODV, this work explores the issue of neighbor sensing with broadcast messages introducing "communication gray zones", and presents three different techniques to overcome the gray zone problem.
Abstract: Our experiments with IEEE 802.11b based wireless ad hoc networks show that neighbor sensing with broadcast messages introduces "communication gray zones": in such zones data messages cannot be exchanged although the HELLO messages indicate neighbor reachability. This leads to a systematic mismatch between the route state and the real world connectivity, resulting in disruptive behavior. Concentrating on AODV we explore this issue and present three different techniques to overcome the gray zone problem.
77 citations
01 Dec 2003
TL;DR: This paper proposes to integrate the infrastructure mode and the ad hoc mode in a wireless network so as to improve system throughput substantially without user's manual configuration and presents a framework for such mixed-mode wireless LAN (termed M/sup 2/-WLAN).
Abstract: In the traditional IEEE 802.11 wireless LAN using infrastructure mode, all users share the same channel and all packets are forwarded by an access point (AP). As a result, as the number of users in the cell increases, the throughput for each user degrades substantially. If there are users communicating with each other within the cell (as in conferencing or file exchange applications), such throughput degradation could be relieved by making these users communicate through ad hoc connections without going through the AP. The advantages are multi-fold. First, the traffic load at the AP is reduced, hence relieving the contention. Second, ad hoc connections are single-hop, hence improving the channel efficiency. Moreover, ad hoc connections could use different channels, hence multiplying the system bandwidth. In this paper, we propose to integrate the infrastructure mode and the ad hoc mode in a wireless network so as to achieve these advantages. We present a framework for such mixed-mode wireless LAN (termed M/sup 2/-WLAN). In such a network, a node can dynamically switch between the infrastructure mode and the ad hoc mode according to the instruction of the AP, and hence the switching is transparent to the users. Using simulations, we show that M/sup 2/-WLAN can indeed improve system throughput substantially without user's manual configuration.
77 citations
TL;DR: In this letter, an enhancement to the prediction-based link availability estimation originally proposed by the author, D. J. Rao, and J. Q. Rao is discussed, and a better L(T/sub p/) estimation that averts the intuitive parameter setting used by the original one is provided.
Abstract: In this letter, an enhancement to the prediction-based link availability estimation originally proposed by the author, D. J. He, and J. Q. Rao is discussed. This enhancement consists of the principle for the theoretical calculation of link availability, L(T/sub p/), and a better L(T/sub p/) estimation that averts the intuitive parameter setting used by the original one. Numerical comparisons between results given by the two estimations and simulation are provided.
77 citations