Capacity upgrading in mobile ad hoc access networks (MAHANs) using CSMA/CAPA

Authors:
Chun-Yen Hsu;Jean-Lien C. Wu;Shun-Te Wang
Affiliations:
National Taiwan University of Science and Technology;National Taiwan University of Science and Technology;National Taiwan University of Science and Technology
Venue:
Proceedings of the 4th ACM international workshop on Mobility management and wireless access
Year:
2006

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Abstract

From recent trends, mobile ad hoc access networks (MAHANs) have attracted high attention to be adopted in future 4G networks. The gateway in a typical MAHAN provides Internet access service for mobile nodes. In order to guarantee ubiquitous Internet accessibility, mobile nodes should cooperate to relay packets for nodes lying behind the radio coverage of the gateway. The carrier sense multiple access with collision avoidance (CSMA/CA) protocol is commonly used as the MAC protocol in ad hoc networks. However, CSMA/CA suffers from contentions and is not suitable for MAHANs where traffic flows are aggregated at the gateway. In this paper, we propose the CSMA protocol with collision avoidance, packing and accompanying (CSMA/CAPA) for MAHANs. The packing scheme allows more packets to be transmitted in a frame while the accompanying scheme allows nodes with more opportunities to transmit their frames. The feasible queueing strategy for CSMA/CAPA protocol is discussed. Simulation results show that CSMA/CAPA can significantly upgrade the capacity of MAHANs even when the channel error rate is high.