IP-MAC: A Distributed MAC for Spatial Reuse in Wireless Networks

Md. Mustafizur RAHMAN
Choong Seon HONG
Sungwon LEE
JangYeon LEE
Jin Woong CHO

IEICE TRANSACTIONS on Communications   Vol.E93-B    No.6    pp.1534-1546
Publication Date: 2010/06/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.1534
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
wireless network,  spatial reuse,  concurrent transmissions,  CSMA/CA,  channel access,  wireless MAC,  

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The CSMA/CA driven MAC protocols withhold packet transmissions from exposed stations when they detect carrier signal above a certain threshold. This is to avoid collisions at other receiving stations. However, this conservative scheme often exposes many stations unnecessarily, and thus minimizes the utilization of the spatial spectral resource. In this paper, we demonstrate that remote estimation of the status at the active receivers is more effective at avoiding collisions in wireless networks than the carrier sensing. We apply a new concept of the interference range, named as n-tolerant interference range, to guarantee reliable communications in the presence of n (n≥ 0) concurrent transmissions from outside the range. We design a distributed interference preventive MAC ( IP-MAC ) using the n-tolerant interference range that enables parallel accesses from the noninterfering stations for an active communication. In IP-MAC, an exposed station goes through an Interference Potentiality Check (IPC) to resolve whether it is potentially interfering or noninterfering to the active communication. During the resolve operation, IPC takes the capture effect at an active receiver into account with interfering signals from a number of possible concurrent transmissions near that receiver. The performance enhancement offered by IP-MAC is studied via simulations in different environments. Results reveal that IP-MAC significantly improves network performance in terms of throughput and delay.