Journal
COMPUTER NETWORKS
Volume 92, Issue -, Pages 24-40Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.comnet.2015.08.050
Keywords
MU-MIMO; MAC protocol; Distributed protocol
Categories
Funding
- National Research Foundation of Korea(NRF) Grant - Korea government(MSIP) [2015R1A2A2A01008240]
- MSIP(Ministry of Science, ICT & Future Planning), Korea, under the C-ITRC(Convergence Information Technology Research Center) [IITP-2015-H8601-15-1001]
- National Research Foundation of Korea [2015R1A2A2A01008240] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ask authors/readers for more resources
The performance of uplink multiuser MIMO (MU-MIMO) transmissions heavily depends on which users to transmit together. In WLANs where each user independently determines when to transmit by random access, the performance degradation occurs when a set of users for concurrent transmissions are not chosen properly. In this paper, we address this problem and propose Delta SNR-MAC protocol to enhance the uplink throughput in MU-MIMO WLANs. In Delta SNR-MAC, a set of users transmitting together are determined one after another through a multi-round contention where the number of rounds equals the number of antennas at the AP. In each round, given winning users that are already transmitting, each user calculates its SNR reduction amount due to the winning users. Delta SNR-MAC gives a higher priority to users with less SNR reduction amounts. To achieve this, each round consists of multiple stages where earlier stages are reserved for users with less SNR reduction amounts. In this way, users with the strong channel orthogonality can transmit together in a fully distributed manner. We theoretically analyze the throughput of Delta SNR-MAC and propose a parameter selection method to maximize the throughput. Our evaluation results confirm that Delta SNR-MAC improves the uplink throughput over existing schemes both in two- and three-antenna AP cases and achieves temporal fairness in mobile environments. (C) 2015 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available