论文信息 - BE-DCF: Barring-Enhanced Distributed Coordination Function for Machine Type Communications in IEEE 802.11 networks

BE-DCF: Barring-Enhanced Distributed Coordination Function for Machine Type Communications in IEEE 802.11 networks

In contention-based wireless networks, the efficiency of channel access mechanism is greatly affected by the contention level. The basic channel access mechanism, i.e. distributed coordination function (DCF), of IEEE 802.11 networks employs the exponential backoff scheme to alleviate the channel contention, which works efficiently in practice with small number of stations and traditional human-centric traffic. However, the emerging Machine-Type Communications (MTC) is bringing new challenges on IEEE 802.11 networks due to its massive access and special traffic pattern. Therefore, in this paper, we address the collisional collapse problem in the MTC scenario where the efficiency of DCF is extremely low because of high-level collision. To solve this problem, we propose a Barring-Enhanced Distributed Coordination Function (BE-DCF) at each Machine-Type Device (MTD) to coordinately restrict the contention to a reasonable low level by randomly barring its transmit attempt. Simulation results show that, the proposed BE-DCF achieves higher and stable throughput and lower frame drop ratio than legacy DCF mechanism at the cost of a slight increase on channel access delay in MTC scenario, especially when the MTC traffic is highly correlated.Japan

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