NDLI: Carrier Grade Wi-Fi: Air interface requirements and technologies

Content Provider	IEEE Xplore Digital Library
Author	Xiaofei Wang Hanqing Lou Ghosh, M. Guodong Zhang Pengfei Xia Oteri, O. La Sita, F. Olesen, R. Shah, N.
Copyright Year	2014
Description	Author affiliation: InterDigital Commun., LLC, Melville, NY, USA (Xiaofei Wang; Hanqing Lou; Ghosh, M.; Guodong Zhang; Pengfei Xia; Oteri, O.; La Sita, F.; Olesen, R.; Shah, N.)
Abstract	The IEEE 802.11 standardization group has recently ratified 802.11ac as the newest major amendment of the 802.11 family of Wi-Fi standards. While 802.11ac has specified a number of improvements over 802.11n such as: (i) 8 spatial streams (ii) mandatory bandwidth of 80 MHz and (iii) multi-user MIMO on the downlink, these improvements mostly target to improve the per-link throughput, and in case of MU-MIMO, traffic performance on the downlink. In order to satisfy the air interface high efficiency requirements and technologies, herein referred to broadly as 5G-Carrier Grade WiFi (5G-CGW), it is important to consider other metrics for system performance, such as area-throughput and Quality of Experience (QoE), which are more relevant in use cases where there can be a dense deployment of access points (APs), and stations (STAs). Recently, 802.11 started a study group called High Efficiency Wi-Fi (HEW) to develop the next generation of Wi-Fi physical (PHY) and medium access control (MAC) protocols that would satisfy these requirements. In this paper we will first provide an overview of the state-of-the-art in 802.11 standards, followed by a discussion on some of the limitations of 802.11ac in use cases of interest such as dense deployments in apartment buildings, stadiums and airports. We will provide an overview and preliminary simulation results of three technologies that have shown promise for meeting the requirements of CGW: (i) Multi-User Parallel Channel Access (MU-PCA) which would allow APs to simultaneously transmit to and to receive from a number of STAs in the frequency domain: enabled through multiplexing. This would alleviate the problem of underutilization of frequency resources caused by the need to support STAs of different bandwidths. (ii) Uplink Multi-User MIMO (UL MU-MIMO): IEEE 802.11ac standardized multi-user simultaneous transmissions in the downlink via downlink MU-MIMO. Uplink MU-MIMO needs to be defined to enable multiple users to share the spatial domain and transmit at the same time in the uplink. (iii) Fractional CSMA and Transmit Power Control (TPC): In a dense deployment of APs, the performance of overlapping basic service sets (BSSs) can be improved by coordinating the transmitted power in the adjacent APs in such a manner that STAs on the edge of coverage face reduced interference.
Sponsorship	IEEE Long Island Sect.
Starting Page	1
Ending Page	6
File Size	508224
Page Count	6
File Format	PDF
ISBN	9781479938506
DOI	10.1109/LISAT.2014.6845194
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-05-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	IEEE 802.11 Standards Throughput Downlink Uplink Multiaccess communication Bandwidth Interference TPC 5G Carrier-Grade WiFi CGW WiFi WLAN MU-PCA UL MU-MIMO Fractional CSMA
Content Type	Text
Resource Type	Article

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