Simulation of Busy Tone Multiple Access Modes in Multihop Packet Radio Networks.
STANFORD UNIV CA STANFORD ELECTRONICS LABS
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In this study we examine via simulation, the performance of the ALOHA, CSMA, BTMA, and CDMA channel access schemes in multihop packet radio systems. The performance of CSMA, which is efficient in fully-connected environments, is shown to degrade significantly in the presence of hidden nodes. The BTMA protocol attempts to overcome the hidden node problem and to obtain efficient channel utilization in multihop environments by having nodes transmit a busy tone when they are busy receiving. In an example of a six node ring topology, we compare the performance of the CSMA and ALOHA schemes with four variants of BTMA. The highest throughput is achieved by II-BTMA and C-BTMA, which both significantly outperform the CSMA and ALOHA schemes. Our conclusion is that the improvement in bandwidth utilization achieved by BTMA in environments with hidden nodes, is expected to more than compensate for the cost of the busy tone channel. Author
- Computer Systems
- Non-Radio Communications