Abstroct--Due to station mobility, the network topology is continuously changing in mobile ad hoc networks. In this paper, we propose a neighbor-tahle-hased multipath routing (NTBMR) protocol to track the dynamic topology changes. Distinguished from prior work on multipath protocols employing disjoint paths, NTBMR does not require the routes to he disjoint. In order to verify the different capabilities against dynamic topology changes for disjoint end non-disjoint multipath routings, we make an attempt to analyze their route reliahilities. Theoretical analysis reveals that non-disjoint multipath routing has higher route reliability when the wireless links are unreliable. In NTBMR scheme, we also prcsent a technique to estimate the mean and variance of the lifetime of a wireless link, which can be used to aid route discovery and maintenance. Simulation results show that our multipath routing scheme is relatively robust in an environment with frequent topology changes and can improve the en&to-end delay and packet delivery ratio prformance substantially compared to unipath routing. K p o r k d hoe networks, unipoth routingprotocol, multipath routingprotocol, source routingprotocol
cii ..Ib.~~raci-I n this pap-1; w e propose a new hvo-dimensional Miitkn modcl, which considers packet losses, for carrier sense multiple access with cullision nwidance (CSMAKA) mechiinism. Sinre the initial contention window (ICW) has gent impact an the prrtirrmancc 0 1 CSMAICA, w e introduce nn adjustnhlc state pnl-amcter p(t1 5 q 5 I ) to extend ICW. I n addition, we iiniilyze thc inomher of competing stations for any source station in n 111 ultiliiip ad hoc network. Bnsed on the nnalysis result, we develop a i i sdjusting procedure for CSMAICA mechanism in multihop i i t l I h c Ineh%orkr. The simulation rcsults show that the pPcket 1osx nitio can be reduced thinugh dyamically adjusting 1CW hy clwntring (1.
Abstrrrct--Cross layer design i s a promising approach in mobile ad hoc networks ( M A N E T ) to combat the fast time-varying characteristics of wireless links, network topology, and application traffic. I n this paper, we employ cross layer design to develop a novel scheduling scheme with two optimizations aimed at service differentiation. T h e scheduling scheme is executed at the network layer of every station according to the channel conditions estimated by the M A C layer. The optimizations are based on traffic property sharing and packet timeout period interaction to reduce the packet collisions and improve network performance. W e evaluate the proposed scheme under different network loads in terms o f packet delivery ratio, average end-to-end delay and delay jitter. T h e simulation results show that our scheme can provide different service differentiations for time-bounded and best effort traffics. I n particular, we can guarantee the delay and delay jitter requirements of time-bounded traffic.
In this paper, we analyze the maximum throughputs of slotted-ALOHA-based multihop ad hoc networks with and without capture, by considering the degree (number of neighbors) of each node, and, different from prior research, allowing each node to have a different transmission probability. We propose a novel enhanced slotted ALOHA scheme, in which each station adaptively transmits packets according to the degrees of the stations' neighbors. The analytical and simulation results show that the enhanced scheme can improve the network performance greatly.
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