电子学报 ›› 2015, Vol. 43 ›› Issue (6): 1241-1248.DOI: 10.3969/j.issn.0372-2112.2015.06.031

• 科研通信 • 上一篇    

MIMO链路Ad Hoc网络中线程化的拓扑未知多址接入协议

陈丹1,2, 李金丹1, 闫茂德1, 李建东2, 李长乐2   

  1. 1. 长安大学电子与控制工程学院, 陕西西安 710064;
    2. 西安电子科技大学综合业务网络理论及关键技术国家重点实验室, 陕西西安 710071
  • 收稿日期:2013-10-18 修回日期:2014-04-17 出版日期:2015-06-25 发布日期:2015-06-25
  • 通讯作者: 陈丹
  • 作者简介:李金丹 女,1988年生于河南省陕县.长安大学电子与控制工程学院硕士研究生,主要研究方向为智能交通系统,交通信息与控制等.
  • 基金资助:

    国家自然科学基金(No.61231008);陕西省工业科技攻关项目(No.2014K05-59);中央高校基本科研业务费资助项目(No.2014G2320006,No.2014G3322008,No.310832151089)

Threaded Topology Transparent Multiple Access Protocol for MIMO Link Ad Hoc Networks

CHEN Dan1,2, LI Jin-dan1, YAN Mao-de1, LI Jian-dong2, LI Chang-le2   

  1. 1. School of Electronic and Control Engineering, Chang'an University, Xi'an, Shaanxi 710064, China;
    2. State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an, Shaanxi 710071, China
  • Received:2013-10-18 Revised:2014-04-17 Online:2015-06-25 Published:2015-06-25

摘要:

针对MIMO链路Ad Hoc网络,提出了支持MIMO的线程化拓扑未知多址接入协议(MIMO-T-TTMA).MIMO-T-TTMA将时间扩展多址接入(TSMA)协议和时分多址接入(TDMA)协议以时间交替的方式相结合,进而为网络中节点分配时隙.在MIMO-T-TTMA中,每个节点被分配了若干时隙,每个分配时隙中,节点通过交互请求发送/允许发送(RTS/CTS)分组来确定发送使用的数据流数,而当RTS/CTS交互失败或者当前时隙为未分配时隙时,节点仍依一定的概率发送一个数据流,以提高网络的吞吐量.为了评估协议的性能,推导了MIMO-T-TTMA的吞吐量.数值结果表明,与已有的协议相比,MIMO-T-TTMA在节点度较大时具有较高的吞吐量,并且,吞吐量随节点度的变化比较平稳,因此,MIMO-T-TTMA适用于拓扑常发生剧烈变化的Ad Hoc网络.

关键词: 自组织网络, 媒体接入控制, 协议线程化, 时间扩展多址接入, 多输入多输出

Abstract:

A MIMO-aware threaded topology transparent multiple access(MIMO-T-TTMA) protocol is proposed for MIMO link ad hoc networks.MIMO-T-TTMA utilizes the protocol threading technique and combines a time spread multiple access(TSMA) protocol and a time division multiple access(TDMA) protocol in time-sharing mode.In MIMO-T-TTMA, each node in the networks is assigned a few slots.In each of its assigned slot, node determines the number of data streams to be transmitted by exchanging request to send/clear to send(RTS/CTS) packets.While the exchange of RTS/CTS fails or the slot is a non-assigned slot, the node also transmits one stream according to some probability in order to improve the throughput.To evaluate the performance, the throughput of MIMO-T-TTMA is deduced by theoretical analysis.Numerical results show that, compared with existing protocols, MIMO-T-TTMA has higher throughput when node degree is relatively large, moreover, the throughput is more stable with the changes of node degree, therefore, MIMO-T-TTMA applies to the ad hoc networks whose topologies vary significantly.

Key words: ad hoc networks, media access control, protocol-threading, time spread multiple access, multiple input multiple output(MIMO)

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