Abstract
Recently, explosive growth of bandwidth demands has motivated many technological revolutions in the Wireless Local Area Networks (WLANs) such as the IEEE 802.11ax task group, which is established to enhance the throughput performance for the Next Generation WLANs (NGW) under high dense deployment scenarios. However, on the one hand, it is known that the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) has become a generally accepted access mechanism in the WLANs, which is shown to bring about serious collisions when the stations (STAs) are relatively crowded. In this case, the channel access efficiency is definitively decreased and thus some frequency channel resources are eventually wasted. On the other hand, due to the inherent fading effect of wireless channel, network throughput of the NGW (i.e., 802.11ax) is further degraded by the existence of Low-Rate-Links (LRLs), where the available data transmission rate is relatively low. To resolve the above two technical issues, a distributed multi-channel MAC protocol, called CRC-MMAC, is proposed for the NGW. In the proposed CRC-MMAC, the concept of reserved-cooperative-link (RCL) is proposed and initiated under multi-channel environment, to fully exploit the potential of both channel reservation and cooperative relay. Accordingly, collisions in the network are effectively decreased using channel reservation as well as the data transmission rate of LRLs is significantly improved with cooperative relay. Furthermore, an analysis of the upper bound of saturation throughput gain is derived, which is validated by extensive simulations. Compared with the ‘Baseline’ scheme, i.e., the existing Dynamic Channel Assignment (DCA) protocol [1] using TXOP (Transmission Opportunity), the experiments results show that the saturation throughput of CRC-MMAC exceeds about \(140\,\%\), and the average packet delay is decreased by nearly \(60\,\%\).
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Notes
A detailed analysis about dependence of channel reservation and cooperative relay is presented in Sect. 3.
In the dense Wi-Fi environment, the available frequency spectrum of each node varies frequently due to the interferences from OBSS.
In this paper, ‘Serial-Coop’/‘SC’ and ‘Parallel-Coop’/‘PC’ are used to denote the serial cooperation and parallel cooperation strategies respectively.
The common data channels denote the data channels that are available for S, D and \(r_i\).
In this paper, a numerical-backoff algorithm is performed by each relay candidate, where the backoff unit is not slot but numerical value.
When \(K\rightarrow \infty \), any contending successful nodes have an available data channels, such that the control channel can be saturated.
By using the Bianchi’s Model [9], the channel contention successful probability of each slot of all of the networks nodes can be got, when each node’s traffic rate is saturated. Such that, the time length of the consecutive successful contention may be exponentially distributed. Therefore, the total nodes’ contending successful rate, i.e., the network’s packet arrival rate, is Poisson distributed.
Note that the cooperative relay is not being used, then the process of choosing optimal relay is not required and the overhead introduced by channel reservation is relatively small, which approximately leads to \(t_s^{m} \approx {t_s}\).
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Acknowledgments
This work was supported in part by the National Natural Science Foundations of CHINA (Grant No. 61271279, 61201157, and 61501373), the National 863 plans project (Grant No. 2014AA01A707, and 2015AA01A704), the National Science and Technology Major Project (Grant No. 2015ZX03002006-004, and 2016ZX03001018-004), and the Fundamental Research Foundation of NPU (Grant No. 3102015ZY038, 3102015ZY039).
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Yang, B., Li, B., Yan, Z. et al. A channel reservation based cooperative multi-channel MAC protocol for the next generation WLAN. Wireless Netw 24, 627–646 (2018). https://doi.org/10.1007/s11276-016-1355-3
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DOI: https://doi.org/10.1007/s11276-016-1355-3