基于Wi-Fi的TDMA机制设计与分析
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摘要
针对当前基于IEEE 802.11协议的无线网络无法满足控制系统实时性和可靠性要求的问题,首先提出Wi-Fi TDMA机制,通过划分时隙和多次重传满足无线控制网络的要求;然后详细分析了采用Wi-Fi TDMA机制的站点与现有Wi-Fi站点之间的相互干扰情况,并建立了Wi-Fi TDMA站点接入时延的分析模型;最后,仿真证明Wi-Fi TDMA机制可有效保证数据包传输的实时性和可靠性。通过对比理论分析与仿真结果验证了时延分析模型的正确性,同时探讨了影响接入时延的主要因素。
To deal with the problem that the wireless network based on IEEE 802. 11 protocol can not meet the control system's requirements for real-time and reliability,the Wi-Fi TDMA mechanism was proposed in the paper firstly. By dividing the time slot and multiple retransmission,the requirements of the wireless control network were satisfied. Then,the interference between the stations using Wi-Fi TDMA mechanism and the normal Wi-Fi stations was analyzed in detail,and the analysis model of the access delay of the Wi-Fi TDMA station was established. Finally,the simulation results show that the Wi-Fi TDMA mechanism can guarantee the real-time and reliability of packet transmission. By comparing the theoretical analysis and simulation results,the correctness of the delay analysis model was verified,and the main factors affecting the access delay were discussed.
To deal with the problem that the wireless network based on IEEE 802. 11 protocol can not meet the control system's requirements for real-time and reliability,the Wi-Fi TDMA mechanism was proposed in the paper firstly. By dividing the time slot and multiple retransmission,the requirements of the wireless control network were satisfied. Then,the interference between the stations using Wi-Fi TDMA mechanism and the normal Wi-Fi stations was analyzed in detail,and the analysis model of the access delay of the Wi-Fi TDMA station was established. Finally,the simulation results show that the Wi-Fi TDMA mechanism can guarantee the real-time and reliability of packet transmission. By comparing the theoretical analysis and simulation results,the correctness of the delay analysis model was verified,and the main factors affecting the access delay were discussed.
引文
[1]IEEE.Wireless LAN Medium Access Control(MAC)and Physical Layer(PHY)Specifications[S].IEEE Std.802.11,2012.
[2]I Hussain,N Sarma,D K Saikia.TDMA MAC Protocols for Wi Fi-based Long Distance Networks:A Survey[J].International Journal of Computer Applications,2014,94(19):1-8.
[3]林俊如,曾鹏,于海斌.面向高速工业无线网络的TDMA MAC协议设计与实现[J].计算机科学,2011,38(10A):299-304.
[4]V Sevani,B Raman,P Joshi.Implementation-Based Evaluation of a Full-Fledged Multihop TDMA-MAC for Wi Fi Mesh Networks[J].IEEE Transactions on Mobile Computing,2013,13(2):392-406.
[5]沈磊,杨剑锋,徐俊,郭成城.基于Wi-Fi的无线控制网络TDMA协议的设计[J].计算机工程与应用,2017,53(11):142-145.
[6]J Lin,et al.A Qo S supporting ad hoc network protocol combing admission based TDMA and 802.11 DCF[C].Network Operations and Management Symposium(APNOMS),2014 16th Asia-Pacific.IEEE,2014:1-4.
[7]Y H Wei,et al.RT-Wi Fi:Real-time high-speed communication protocol for wireless cyber-physical control applications[C].Real-Time Systems Symposium(RTSS),2013 IEEE 34th.IEEE,2013:140-149.
[8]R Moraes,F Vasques,P Portugal.A TDMA-based mechanism to enforce real-time behavior in Wi Fi networks[C].Factory Communication Systems,2008.WFCS 2008.IEEE International Workshop on.IEEE,2008:109-112.
[9]X Zhang,K G Shin.Enabling coexistence of heterogeneous wireless systems:Case for Zig Bee and Wi Fi[C].Proceedings of the Twelfth ACM International Symposium on Mobile Ad Hoc Networking and Computing.ACM,2011:6.
[10]唐伟华,石高涛.Zig Bee网络中基于概率CSMA的Wi Fi干扰避免方法[J].计算机工程,2016,42(4):55-59.
[11]G Bianchi.Performance analysis of the IEEE 802.11 distributed coordination function[J].IEEE Journal on Selected Areas in Communications,2000,18(3):535-547.
[2]I Hussain,N Sarma,D K Saikia.TDMA MAC Protocols for Wi Fi-based Long Distance Networks:A Survey[J].International Journal of Computer Applications,2014,94(19):1-8.
[3]林俊如,曾鹏,于海斌.面向高速工业无线网络的TDMA MAC协议设计与实现[J].计算机科学,2011,38(10A):299-304.
[4]V Sevani,B Raman,P Joshi.Implementation-Based Evaluation of a Full-Fledged Multihop TDMA-MAC for Wi Fi Mesh Networks[J].IEEE Transactions on Mobile Computing,2013,13(2):392-406.
[5]沈磊,杨剑锋,徐俊,郭成城.基于Wi-Fi的无线控制网络TDMA协议的设计[J].计算机工程与应用,2017,53(11):142-145.
[6]J Lin,et al.A Qo S supporting ad hoc network protocol combing admission based TDMA and 802.11 DCF[C].Network Operations and Management Symposium(APNOMS),2014 16th Asia-Pacific.IEEE,2014:1-4.
[7]Y H Wei,et al.RT-Wi Fi:Real-time high-speed communication protocol for wireless cyber-physical control applications[C].Real-Time Systems Symposium(RTSS),2013 IEEE 34th.IEEE,2013:140-149.
[8]R Moraes,F Vasques,P Portugal.A TDMA-based mechanism to enforce real-time behavior in Wi Fi networks[C].Factory Communication Systems,2008.WFCS 2008.IEEE International Workshop on.IEEE,2008:109-112.
[9]X Zhang,K G Shin.Enabling coexistence of heterogeneous wireless systems:Case for Zig Bee and Wi Fi[C].Proceedings of the Twelfth ACM International Symposium on Mobile Ad Hoc Networking and Computing.ACM,2011:6.
[10]唐伟华,石高涛.Zig Bee网络中基于概率CSMA的Wi Fi干扰避免方法[J].计算机工程,2016,42(4):55-59.
[11]G Bianchi.Performance analysis of the IEEE 802.11 distributed coordination function[J].IEEE Journal on Selected Areas in Communications,2000,18(3):535-547.