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首页> 外文期刊>Eurasip Journal on Wireless Communications and Networking >Coherence time-based cooperative MAC protocol for wireless ad hoc networks
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Coherence time-based cooperative MAC protocol for wireless ad hoc networks

机译：无线自组网基于相干时间的协同MAC协议

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摘要

In this article, we address the goal of achieving performance gains under heavy-load and fast fading conditions. CoopMACI protocol proposed in Proceedings of the IEEE International Conference on Communications (ICC), Seoul, Korea, picks either direct path or relay path based on rate comparison to enhance average throughput and delay performances. However, CoopMACI performance deteriorates under fading conditions because of lower direct path or relay path reliability compared to UtdMAC (Agarwal et al. LNCS, 4479, 415-426, 2007). UtdMAC was shown to perform better than CoopMACI in terms of average throughput and delay performances because of improved transmission reliability provided by the backup relay path. Although better than CoopMACI, UtdMAC does not fully benefit from higher throughput relay path (compared to the direct path), since it uses relay path only as a secondary backup path. In this article, we develop a cooperative MAC protocol (termed as instantaneous relay-based cooperative MAC-IrcMAC) that uses channel coherence time and estimates signal-to-noise ratio (SNR) of source-to-relay, relay-to-destination, and source-to-destination links, to reliably choose between relay path or direct path for enhanced throughput and delay performances. Unique handshaking is used to estimate SNR and single bit feedbacks resolve contentions among relay nodes, which further provides source node with rate (based on SNR) information on source-to-destination, source-to-relay, and relay-to-destination links. Simulation results clearly show that IrcMAC significantly outperforms the existing CoopMACI and the UtdMAC protocols in wireless ad hoc network. Results show average throughput improvements of 41% and 64% and average delay improvementd of 98.5% and 99.7% compared with UtdMAC and CoopMACI, respectively.
机译：在本文中，我们解决了在重载和快速衰落条件下实现性能提升的目标。在韩国首尔举行的IEEE国际通信会议（ICC）会议录中提出的CoopMACI协议基于速率比较来选择直接路径或中继路径，以提高平均吞吐量和延迟性能。但是，由于与UtdMAC相比，直接路径或中继路径的可靠性较低，因此CoopMACI性能在衰落条件下会下降（Agarwal等人，LNCS，4479，415-426，2007）。由于备用中继路径提供了改进的传输可靠性，因此在平均吞吐量和延迟性能方面，UtdMAC的性能优于CoopMACI。尽管比CoopMACI更好，但UtdMAC并未完全受益于较高吞吐量的中继路径（与直接路径相比），因为它仅将中继路径用作辅助备份路径。在本文中，我们开发了一种协作式MAC协议（称为基于瞬时中继的协作式MAC-IrcMAC），该协议使用信道相干时间并估计源到中继，中继到目的地的信噪比（SNR）。以及源到目的地的链接，以可靠地在中继路径或直接路径之间进行选择，以提高吞吐量和延迟性能。独特的握手用于估计SNR，并且单比特反馈解决了中继节点之间的争用，这进一步为源节点提供了源到目标，源到中继和中继到目标链路上的速率（基于SNR）信息。 。仿真结果清楚地表明，IrcMAC在无线自组网中明显优于现有的CoopMACI和UtdMAC协议。结果表明，与UtdMAC和CoopMACI相比，平均吞吐量分别提高了41％和64％，平均延迟分别提高了98.5％和99.7％。

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