一种用于多跳分布式无线网络的多址接入协议及其性能分析

为多跳分布式无线网络提出了一套灵活而有效的自适应获取冲突避免(AACA)的多址接入协议．它综合了多信道和随机附带预约的思想，有效地解决了多跳网络环境下出现的隐藏终端和暴露终端问题以及由于节点的移动而造成的侵入终端问题．在该协议中，各节点自适应预约所要使用的空闲业务信道，预约之后的通信过程不会受到其它节点的干扰．AACA协议有三种形式，即AACA-SDT／MDT／RDT协议，它们使用任意确定数目的信道，在总带宽相同的情况下表现出比单信道RTS／CTS协议更好的网络性能．

A Novel Multiple Access Protocol for Multihop Wireless Ad Hoc Networks

A flexible and effective Adaptive Acquisition Collision Avoidance (AACA) multiple access protocol is proposed for multihop wireless ad hoc networks. With this protocol, resource reservation is made on multiple channels (frequency bands or spread-spectrum codes) by half-duplex radios without any help of base stations (BS) and wired backbone networks. It integrates the concept of multi-channel and random reservation with piggyback to effectively solve hidden terminal problem and exposed terminal problem caused by multihop architecture and intruding terminal problem due to node moving. In the protocol, every node adaptively reserves an idle traffic channel by request-to-send/clear-to-send (RTS/CTS) dialogue on the common channel. After successful reservation, the data packet transmissions between related nodes are not disturbed or interrupted by other nodes. Compared with other current multi-channel protocols, the proposed AACA-SDT/MDT/RDT protocol can use any number of channels flexibly and efficiently. In the case of the same total bandwidth, our performance analysis and numerical results show that its performance is better than that of the RTS/CTS protocols with single channel if the number of multiple channels is not too large.