A Study Of Data Link Layer Protocols For Underwater Acoustic Network

In the last two decades, underwater acoustic communication technology has experienced significant progress. Communication systems with increased bit rate and reliability now enable real-time point-to-point links between underwater nodes. Current research is focused on combining various point-to-point links within a network structure to meet the demand for various applications. Because of hostile propagation condition in underwater channel, the design of high-reliable, high-throughput underwater acoustic networks(UAN) is a difficult task.We first summarize on development and characteristic of the UAN, and design three layered architecture that are physical layer, the data link layer and the network layer. Based on the analysis of the feather of underwater acoustic channel, we choose the plane multi-hop topologyThe data link layer protocols are focused on. On the one hand, we introduce three floor and error correction control protocols which control the logical sequence of exchanging the frame between two nodes. we also analysis the merit and defect of them and choose stop-wait ARQ protocol to meet the UAN. On the other hand, several medium access control protocol are expatiated and some scheme are brought forward to solve the hidden terminal and exposed terminal. At the same time we design the time backoff arithmetic for data collision.At last we design a UAN making of four nodes and simulate the data link layer protocols. Floor and error correction control protocol choose stop-wait ARQ protocol and medium access control protocol choose MACAW protocol. We compare the network feather in the case of different frame length and different error rate.