东南大学学报(自然科学版)
東南大學學報(自然科學版)
동남대학학보(자연과학판)
JOURNAL OF SOUTHEAST UNIVERSITY
2014年
6期
1138-1143
,共6页
张轩%刘野%刘昊%李智群
張軒%劉野%劉昊%李智群
장헌%류야%류호%리지군
无线传感器网络%多信道%网络干扰%服务质量
無線傳感器網絡%多信道%網絡榦擾%服務質量
무선전감기망락%다신도%망락간우%복무질량
wireless sensor network%multichannel%network interference%QoS (quality of service)
为了解决无线传感器网络内部节点干扰和外部WiFi网络干扰引起的服务质量下降问题,提出了一种动态多信道MAC协议DM-MAC.首先,通过3次握手机制和分布式计算方法为网络内节点分配初始信道.其次,构造拉丁跳频矩阵,节点根据初始信道号在矩阵中选取对应的跳频序列.在此基础上,利用状态转移图调整每个信道在跳频序列中的位置.当可用信道数量发生变化时,根据信道状态转移图生成新的拉丁跳频序列.最后,利用网络仿真软件NS2对DM-MAC通信性能进行分析.实验结果表明,与MuCHMAC协议相比,DM-MAC能够有效地降低突发流量传输时内部节点间的干扰,以及外部WiFi干扰源对无线传感器网络性能的影响.同时,该协议改善了平均端到端延时和数据延时上限性能指标,提升了网络服务质量.
為瞭解決無線傳感器網絡內部節點榦擾和外部WiFi網絡榦擾引起的服務質量下降問題,提齣瞭一種動態多信道MAC協議DM-MAC.首先,通過3次握手機製和分佈式計算方法為網絡內節點分配初始信道.其次,構造拉丁跳頻矩陣,節點根據初始信道號在矩陣中選取對應的跳頻序列.在此基礎上,利用狀態轉移圖調整每箇信道在跳頻序列中的位置.噹可用信道數量髮生變化時,根據信道狀態轉移圖生成新的拉丁跳頻序列.最後,利用網絡倣真軟件NS2對DM-MAC通信性能進行分析.實驗結果錶明,與MuCHMAC協議相比,DM-MAC能夠有效地降低突髮流量傳輸時內部節點間的榦擾,以及外部WiFi榦擾源對無線傳感器網絡性能的影響.同時,該協議改善瞭平均耑到耑延時和數據延時上限性能指標,提升瞭網絡服務質量.
위료해결무선전감기망락내부절점간우화외부WiFi망락간우인기적복무질량하강문제,제출료일충동태다신도MAC협의DM-MAC.수선,통과3차악수궤제화분포식계산방법위망락내절점분배초시신도.기차,구조랍정도빈구진,절점근거초시신도호재구진중선취대응적도빈서렬.재차기출상,이용상태전이도조정매개신도재도빈서렬중적위치.당가용신도수량발생변화시,근거신도상태전이도생성신적랍정도빈서렬.최후,이용망락방진연건NS2대DM-MAC통신성능진행분석.실험결과표명,여MuCHMAC협의상비,DM-MAC능구유효지강저돌발류량전수시내부절점간적간우,이급외부WiFi간우원대무선전감기망락성능적영향.동시,해협의개선료평균단도단연시화수거연시상한성능지표,제승료망락복무질량.
In order to alleviate the debasement of quality of service (QoS )caused by interference between transmissions from nodes in wireless sensor network and interference from WiFi devices out-side the network,a dynamic multichannel media access control (DM-MAC)protocol is proposed. First,three-way handshake scheme and distributed computing are used to allot initial channel for nodes in the network.Secondly,each node chooses a channel hopping sequence from a rectangular Latin array according to its initial channel.On this basis,channel positions among the sequence are adjusted using state transition diagram.When the number of used channels changes,the new Latin channel hopping sequence should be reconstructed according to channel state transition diagram.Fi-nally,the performance of DM-MAC is evaluated through NS2 simulations.The results show that compared to MuCHMAC protocol,DM-MAC can reduce internal interference between sensor nodes efficiently,as well as external interference from WiFi devices.Meanwhile,the proposed MAC pro-tocol improves average end-to-end delivery latency and delay bound,and increases the quality of service.