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Achieving Maximum Throughput in Random Access Protocols with Multipacket Reception
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DOI：10.1109/TMC.2012.254.png)
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This paper considers random access protocols with multipacket reception (MPR), which include both slotted-Aloha and slotted tau-persistent CSMA protocols. For both protocols, each node makes a transmission attempt in a slot with a given probability. The goals of this paper are to derive the optimal transmission probability maximizing a system throughput for both protocols and to develop a simple random access protocol with MPR, which achieves a system throughput close to the maximum value. To this end, we first obtain the optimal transmission probability of a node in the slotted-Aloha protocol. The result provides a useful guideline to help us develop a simple distributed algorithm for estimating the number of active nodes. We then obtain the optimal transmission probability in the tau-persistent CSMA protocol. An in-depth study on the relation between the optimal transmission probabilities in both protocols shows that under certain conditions the optimal transmission probability in the slotted-Aloha protocol is a good approximation for the tau-persistent CSMA protocol. Based on this result, we propose a simple tau-persistent CSMA protocol with MPR which dynamically adjusts the transmission probability tau depending on the estimated number of active nodes, and thus can achieve a system throughput close to the maximum value.
Keyword:
Multipacket reception
slotted-Aloha
CSMA
optimal transmission probability
WLAN
802.11 DCF
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5.8K
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1.8W
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