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Article:
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Wireless Networks. 01/2003; 9:165-177.
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ABSTRACT: This paper discusses the issue of routing packets over an IEEE 802.11 ad hoc wireless network with multiple data rates (1/2/5.5/11 Mb/s). With the characteristics of modulation schemes, the data rate of wireless network is inversely proportional with the transmission distance. The conventional shortest path of minimum-hops approach will be no longer suitable for the contemporary multi-rate/multi-range wireless networks (MR 2 WN). In this paper, we will propose an efficient delay-oriented multi-rate/multi-range routing protocol (MR 2 RP) for MR 2 WN to maximize the channel utilization as well as to minimize the network transfer delay from source to desti-nation. By analyzing the medium access delay of the IEEE 802.11 medium access control (MAC) protocol, the proposed MR 2 RP is capable of predicting the transfer delay of a routing path and finding the best one, which has the minimum transfer delay from source to destination. The proposed MR 2 RP may choose a longer path but with less contention competitors and buffer queuing delay. Simulation results show that MR 2 RP performs the load balancing and fast routing very well, and its call blocking probability is obviously lower than that of conventional minimum-hops approach with fixed transmission rate.
Wireless Networks 01/2003; 9:165-177. · 0.52 Impact Factor
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ABSTRACT: In wired networks, the broadcast data packets can be easily and
safely delivered to destinations. Nevertheless, it is a big challenge to
transfer the broadcast frames over the IEEE 802.11 based multi-hop ad
hoc wireless networks due to the high bit error rate, the high collision
probability, and the lake of acknowledgement (ACK). Unfortunately, most
of routing protocols need the broadcast function to exchange important
information between nodes. From our observations, the efficiency of the
routing protocol, such as dynamic source routing (DSR) and ad-hoc
on-demand distance vector (AODV), finding the path from source to
destination is strongly depending on the supported broadcast scheme in
the underlying media access control (MAC) protocol. In this paper, we
first investigate the uncertain broadcast problem in the IEEE 802.11 MAC
protocol while delivering the necessary broadcast frames. Since no
acknowledgement will be sent by any recipient of the broadcast frame in
IEEE 802.11 MAC protocol, we propose a highly reliable broadcast scheme
to solve such uncertain problem. The proposed scheme, which is still
compatible with standard, can efficiently minimize bandwidth consumption
as well as propagation delay
Communications, 2002. ICC 2002. IEEE International Conference on; 02/2002
