Abstract
The dual busy tone multiple access (DBTMA) scheme was designed for distributed multi-hop networks. The protocol uses the RTS/CTS dialogue to reserve the shared channel. In multi-hop networks, some nodes in the range of the transmitter and/or the range of the receiver might not be able to hear a successful RTS/CTS message exchange. This may lead to access collisions and data destruction. Hence we use two narrow bandwidth busy tones, to notify neighbor nodes of the on-going use of the channel. In this paper, we analyze the capacity of the DBTMA protocol. The effects of various parameters on the network utilization in multi-hop networks are also discussed. We compare, through analytical results and simulation means, the performance of the DBTMA protocol with schemes that solely use the RTS/CTS dialogue to prevent collisions and we show that DBTMA provides superior performance to such schemes.
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