通信学报
通信學報
통신학보
JOURNAL OF CHINA INSTITUTE OF COMMUNICATIONS
2013年
9期
55-62
,共8页
陈前斌%刘剑%酆勇%唐伦
陳前斌%劉劍%酆勇%唐倫
진전빈%류검%풍용%당륜
ad hoc网络%协作通信%媒体接入控制%网络编码%空时编码
ad hoc網絡%協作通信%媒體接入控製%網絡編碼%空時編碼
ad hoc망락%협작통신%매체접입공제%망락편마%공시편마
ad hoc network%cooperative communication%MAC%networking coding%space-time coding
针对无线ad hoc网络中协作造成的中继效率低以及不同QoS需求难以满足等问题,提出了一种联合网络编码和空时编码的协作MAC协议(NSTCMAC)。NSTCMAC将网络编码与空时编码技术相结合,设计出区分业务类型的协作MAC协议传输机制,以满足不同业务类型的QoS需求;进一步通过马尔科夫链模型分析了区分业务类型的协作机制及性能。仿真结果表明,相比传统的DCF、COOPMAC以及CD-MAC协议,NSTCMAC协议能更好地保证不同的QoS需求,并能有效地解决协作造成的中继效率低的问题。
針對無線ad hoc網絡中協作造成的中繼效率低以及不同QoS需求難以滿足等問題,提齣瞭一種聯閤網絡編碼和空時編碼的協作MAC協議(NSTCMAC)。NSTCMAC將網絡編碼與空時編碼技術相結閤,設計齣區分業務類型的協作MAC協議傳輸機製,以滿足不同業務類型的QoS需求;進一步通過馬爾科伕鏈模型分析瞭區分業務類型的協作機製及性能。倣真結果錶明,相比傳統的DCF、COOPMAC以及CD-MAC協議,NSTCMAC協議能更好地保證不同的QoS需求,併能有效地解決協作造成的中繼效率低的問題。
침대무선ad hoc망락중협작조성적중계효솔저이급불동QoS수구난이만족등문제,제출료일충연합망락편마화공시편마적협작MAC협의(NSTCMAC)。NSTCMAC장망락편마여공시편마기술상결합,설계출구분업무류형적협작MAC협의전수궤제,이만족불동업무류형적QoS수구;진일보통과마이과부련모형분석료구분업무류형적협작궤제급성능。방진결과표명,상비전통적DCF、COOPMAC이급CD-MAC협의,NSTCMAC협의능경호지보증불동적QoS수구,병능유효지해결협작조성적중계효솔저적문제。
Aiming at the problems in wireless ad hoc networks, such as relays’ low efficiency caused by cooperation and difficult to meet the different QoS requirements, a cooperative MAC protocol was proposed based on the combination of network coding and space-time coding(NSTCMAC). Based on NSTCMAC protocol with the combination of Network coding and space-time coding techniques, a kind of cooperative MAC transmission mechanism that could distinguish the type of DATA packet was designed in order to meet the QoS requirements of different types of transmission. Further more, cooperative transmission mechanism and its performance were analyzed through Markov chain model. When transmitting the non-real-time(NR) packets, network coding was adopted to improve the efficiency of relay nodes;when transmitting the real-time(R) packets, randomized distributed space-time coding(R-DSTC) was used to enhance the relia-bility of transmission. Simulation results show that NSTCMAC protocol can meet different QoS requirements better, and solve the problem of relays’ low efficiency more effectively, when compared with legacy DCF、COOPMAC and CD-MAC protocol.