Study On Channel Allocation Of Multi-Channel MAC Protocol In Ad-Hoc Network

With the development of Mobile distributed wireless Ad-Hoc network techniques, the research of Media Access Control based on Ad-Hoc network which is the most important portion of wireless Ad-Hoc network techniques becomes increasingly feasible and necessary.Multi-channel MAC protocols exploit the multiple channels available in wireless networks to increase capacity. These protocols are for networks in which orthogonal channels, such as disjoint frequency bands, are available. Using a multi channel MAC protocol, different devices can transmit in parallel on distinct channels. The parallelism increases the throughput and can potentially reduce the delay. Because Multi-channel MAC protocols have more predominance than Single-channel MAC protocols in terms of network performances, this paper study on Multi-channel MAC protocols.Protocols differ in how devices agree on the channel to be used for transmission and how they resolve potential contention and collision for a channel. The important of research is how to deal with the above two problems so that Multi-channel MAC can achieve a higher network capacity.Wireless Channels are finite and precious in the multi-hop distributed wireless ad-hoc network, in order to use multi-channel efficiently and improve network performance significantly. This paper presents a new multi-channel MAC protocol, namely Receiver-viewed Multi-channel Dynamic Allocation (RMDA). This essay analyzes the problem of existing multi-channel MAC protocol, such as DCA and MMAC etc, and puts forward a new design thought. In RMDA, every node sends the state information to its neighbor node in real time, and selects a data channel according to the list of neighbor state as a receiver perspective, in order to decrease the probability of conflict occurrence and increase network throughput by using multi-channel efficiently. In addition, the protocol improves network performance significantly, like delay of packets and so on, especially when the network is highly congested.This paper compared and simulated several existing protocol (DCA and MMAC) and RMDA which is the new multi-channel MAC layer protocol by OPNET. Simulations results show that the RMDA in this paper, which can achieve a higher network capacity, is multi-channel MAC protocol. RMDA also presents a new idea for the development of multi-channel MAC protocol.