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Conventional 802.11 carrier sense multiple access/collision avoidance (CSMA/CA) networks perform channel contention and data transmission serially over a whole channel. This leads to low throughput efficiency. In this paper, we propose a novel design called CSMA/CQ (contention queuing) to address this problem. This design is developed from the decoupling idea of SDN (Software-defined networking)....
A contention-tone-based wireless local area network (WLAN) protocol uses out-of-band signaling for contention resolution to achieve efficient medium access. It is shown that such a protocol can operate at near-optimal channel utilization in the medium access control (MAC) layer. This paper addresses the service differentiation design aspect of a contention-tone-based WLAN protocol. In particular,...
This paper propose an adaptive communications quality control for Wireless LANs. This method is composed of (a) adaptive transmission frequency setting method, (b) adaptive CFP (Contention Free Period) setting method, (c) queue control method, and (d) prime slot time method. The special features of the proposed method are (1) an efficient data communication without sacrificing guarantee of the maximum...
In this paper we experimentally study the impact of one EDCA parameter, namely AIFSN on a mixed voice/data wireless transmission. In particular we investigate how the tuning of this parameter affects both the voice transmission quality and background data throughput. We predict end-to-end voice transmission quality from time varying transmission impairments using the latest Appendix to the ITU-T E-model...
This paper focuses on AP buffer effect upon TCP fairness over WLAN, and proposes an estimation algorithm of AP buffer size for TCP fairness over WLAN based on average window size. The key contribution of our algorithm is that it uses the relation of average drop rate to average both window size and used window size, and employs the limited condition of average window size for TCP fairness. Accuracy...
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