Coexistence of LTE-Unlicensed and WiFi with Optimal Channel Aggregation
In this work, we investigate the problem of channel and rate allocation for LTE-Unlicensed (LTE-U) to efficiently coexist with WiFi access points (APs). Specifically, we formulate an auction mechanism where LTE-U first announces an aggregation number (number of WiFi channels that LTE-U wishes to aggregate) and a reserve rate (maximum rate that LTE-U is willing to allocate to an AP), following which the APs decide their mode of operation—cooperation or competition. In cooperation mode, an AP allows LTE-U to exclusively occupy its channel (in return for a rate) while in the competition mode both LTE-U and AP simultaneously contend for channel access. We characterize the solution to the auction problem in terms of Symmetric Bayesian Nash Equilibrium (SBNE) and prove results illustrating its structure. We then optimize the auction mechanism by evaluating the optimal aggregation number and reserve rate that maximizes the total rate achieved by LTE-U subject to a constraint on APs’ rates. Finally, through simulation experiments we demonstrate the efficacy of our algorithm in comparison with (1) the strategy of aggregating a fixed number of channels and (2) a heuristic algorithm where a random number of channels are aggregated.
- 1.“Cisco Visual Networking Index: Forecast and Methodology, 2016–2021,” Cisco White Paper, June 2017.Google Scholar
- 4.Z. Guan and T. Melodia, “CU-LTE: Spectrally-Efficient and Fair Coexistence between LTE and Wi-Fi in Unlicensed Bands,” in IEEE INFOCOM 2016 - The 35th Annual IEEE International Conference on Computer Communications, April 2016.Google Scholar
- 5.R. Zhang, M. Wang, L. X. Cai, X. Shen, L. L. Xie, and Y. Cheng, “Modeling and Analysis of MAC Protocol for LTE-U Co-Existing with Wi-Fi,” in 2015 IEEE Global Communications Conference (GLOBECOM), Dec 2015.Google Scholar
- 7.H. Yu, G. Iosifidis, J. Huang, and L. Tassiulas, “Auction-Based Coopetition Between LTE Unlicensed and Wi-Fi,” IEEE Journal on Selected Areas in Communications, vol. 35, no. 1, pp. 79–90, Jan 2017.Google Scholar