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It is well known that in dense mesh networks, CSMA-based MACs such as IEEE 802.11 achieve lower through-put than optimal spatial TDMA. This paper explores the degree to which the difference in throughput is partly due to a lack of channel usage information and the degree to which the difference is due to packet ordering. To this end, the throughput achieved by a large number of hypothetical MAC algorithms...
A scheme that exploits the broadcast nature of the wireless communication in order to achieve multicast content delivery is presented in this paper. As opposed to broadcasting, this method enables the clients to determine on-line the delivered content, and thus preserves the advantages of an individual service. On the other hand, a multicast content delivery is much more efficient than a unicast content...
Adaptive ARQ is applied to a wireless network, altering retransmission policy according to content importance. By a video deadline-aware buffer discard policy, repeated transmission of expired packets and buffer overflow are mitigated, helping to maintain video quality. Multiple deadlines are applied according to picture type. The combined policy is demonstrated for a bluetooth piconet achieving fast...
In this paper, we propose an adaptive pacing scheme at the link layer for IEEE 802.11 based multihop wireless networks. Our objective is to improve the performance of higher layer protocols without any modifications to them. Our adaptive pacing scheme estimates the four-hop transmission delay in the network path without incurring any additional overheads, and accordingly paces the packets to reduce...
The head-of-line blocking problem impairs the throughput of the hotspot nodes in multihop wireless mesh networks. FIFO scheduling in the current IEEE 802.11 MAC suffers from this problem when the network is highly loaded. The problem may keep the sender in backoff stage up to 70 percent of the time, leading to significant throughput degradation. One solution is to increase the RTS success rate by...
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