With the rapid development of computer and wireless communication technologies, the wireless ad hoc networks are receiving an increasing amount of attention due to its deployment and administration flexibilities. Thus various routing protocols have been developed for wireless ad hoc networks in recent years. This paper presents the results of simulation comparing three multi-hop wireless ad hoc network routing protocols that cover a range of single-path and multi-path source routing design choices: DSR, MSR and BSR. Simulation results demonstrate the performances of DSR, MSR and BSR revealed four interesting insights: (1) In lower mobility situations, multi-path routing MSR and BSR have similar performance as DSR, and three routing protocols being considered all have good performances. (2) In moderate situations of load and mobility, the performances of MSR and BSR are much more superior when compared to that of single-path DSR. And MSR has similar performance as BSR. (3) In heavy load and high mobility situations, BSR performs better than DSR and MSR. (4) In more challenging situations of high mobility, none of the routing protocols considered in this paper can respond to the dynamics in the network topology. The performances of DSR, MSR and BSR are all less than satisfactory.
Proc. SPIE. 6011, Performance, Quality of Service, and Control of Next-Generation Communication and Sensor Networks III
KEYWORDS: Signal attenuation, Microchannel plates, Reliability, Receivers, Local area networks, Wireless communications, Forward error correction, Standards development, Mobile communications, Algorithms
Reliable transport protocols such as TCP are tuned to perform well in traditional networks where packet losses occur mostly because of congestion. However, networks with wireless and other lossy links also suffer from significant non-congestion-related losses due to reasons such as bit errors and handoffs. TCP responds to all losses by invoking congestion control and avoidance algorithms, resulting in degraded end-to-end performance in wireless and lossy networks. In case of wired-wireless interaction (WLANs), the wireless link is assumed to be the last hop where most of the loss and delay occurs. Since the mobile host is adjacent to the wireless hops, it is obviously better equipped to obtain first-hand knowledge of the wireless links. In the paper, we proposed a mobile-host-centric transport protocol called MCP (Mobile-host Control Protocol) that is like TCP in its general behavior, but allows for better congestion control and loss recovery in mobile wireless networks. The MCP shifts most transport layer control policies to the mobile host side under all cases (mobile host is a sender or receiver, fixed or mobile, and so on). Therefore, mobile stations can make better transport layer control in time based on the condition of wireless link.