高吞吐量低时延的太赫兹无线个域网MAC协议

A high throughput and low latency MAC protocol for terahertz wireless personal area networks

针对现有太赫兹无线个域网MAC协议存在的基于动态均衡思想的网络不稳定、不合理的竞争窗口导致退避时间过长,以及所分配CTA长度大于节点的时隙请求量时会导致时隙剩余3个问题,提出了一种高吞吐量低时延的太赫兹无线个域网MAC协议——HTLL-MAC(High Throughput and Low Latency MAC protocol)。HTLL-MAC协议通过基于动态均衡思想的接入机制提高网络稳定性,引入动态更改重传竞争窗口方法缩短了退避所需时间,并且启用CTA剩余时隙机制充分利用剩余时隙,从而达到增加网络吞吐量、降低数据传输时延的效果。理论分析验证了HTLL-MAC协议的有效性。仿真结果表明,相较于IEEE 802.15.3c和HTLD-MAC的MAC层,吞吐量提高了6.15%,数据平均时延降低了32.53%。

To address the problems existing in the present MAC protocol for terahertz wireless personal area networks, including the network is unstable based on dynamic equilibrium, unreasonable contention window causes the back-off time too long, and it will result in channel time slots remaining when the length of the CTA node allocated is greater than the requested amount, a high throughput and low latency MAC protocol for terahertz wireless personal area networks, HTLL-MAC, is proposed. Through accessing mechanism of dynamic equilibrium to improve the stability of network, introducing dynamically changing retransmission back-off contention window method to shorten the time required, and adopting CTA remaining timeslots mechanism to make full use of the remaining time slots, proposed algorithm achieves the effect of increasing network throughput and lowering latency. Theoretical analy- sis verifies the effectiveness of HTLL-MAC. Simulation results show that HTLL-MAC increases the network throughput in MAC layer 26.95%, and lowers average data latency 28.02% under the same conditions.