Cải tiến cho điều khiển tốc độ tầng giao vận trong mạng không dây đa bước

Abstract

Transport  protocols  in  IEEE  802.11 multihop  wireless  networks  (MHWN)  face performance  degradation  problem  due  to  wireless medium  characteristics  and  multihop  nature  which induce several types of packet loss including collision, random  channel  errors  and  route  failures.  The common approach to address this problem is that thetransport  protocol  should  exploit  the  MAC information in order to regulate efficiently the source rate in MHWNs. In this paper, we propose to use twoMAC metrics: the Medium Access Delay used to detectthe  network  contention  level,  and  the  Average Transmission  Time  used  to  estimate  the  effective packet sending rate by which the network will not be overloaded.  The  novel rate  control  mechanism based on these two metrics is called MAC Metric based Rate Control  (MMRC)  and  is  expected  to  provide  better performance than similar rate control mechanisms interms  of  fairness,  packet  loss  rate  and  delay  in MHWNs