In-band full-duplex medium access control design for heterogeneous wireless LAN

EURASIP Journal on Wireless Communications and Networking, May 2017

Full-duplex (FD) wireless communication is evolving into a practical technique, and many studies are being conducting in this area, especially regarding the physical layer. However, to exploit FD benefit successfully, efficient medium access control (MAC) protocols are crucial as well as physical layer advances. Numerous FD-MAC protocols have been proposed, but these MAC protocols cannot address all the issues encountered in this area. In addition, many half-duplex (HD) capable devices are present in existing wireless local area networks (WLANs), so there is an urgent need to integrate FD clients and HD clients in the same WLAN. We refer to this type of WLAN as a heterogeneous WLAN (Het-WLAN). In this paper, we propose an FD-MAC for Het-WLAN, which considers all possible types of FD transmissions. Our proposed FD-MAC protocol suppresses inter-user interference. Simulation results demonstrated that a significant throughput gain (about 96%) could be achieved by using our proposed FD-MAC compared with traditional HD communications. Moreover, our proposed MAC obtained better performance (average throughput gain of about 11%) compared with another existing FD-MAC design. In addition, probability analysis suggested that the total probability of FD transmissions increased rapidly as the WLAN approached saturation conditions.

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In-band full-duplex medium access control design for heterogeneous wireless LAN

Alim et al. EURASIP Journal on Wireless Communications and Networking In-band full-duplex medium access control design for heterogeneous wireless LAN Md. Abdul Alim 0 1 Makoto Kobayashi 1 Shunsuke Saruwatari 1 Takashi Watanabe 1 0 ECE Discipline, Khulna University , Khulna , Bangladesh 1 Department of Information Networking, Graduate School of Information Science and Technology, Osaka University , Osaka , Japan Full-duplex (FD) wireless communication is evolving into a practical technique, and many studies are being conducting in this area, especially regarding the physical layer. However, to exploit FD benefit successfully, efficient medium access control (MAC) protocols are crucial as well as physical layer advances. Numerous FD-MAC protocols have been proposed, but these MAC protocols cannot address all the issues encountered in this area. In addition, many half-duplex (HD) capable devices are present in existing wireless local area networks (WLANs), so there is an urgent need to integrate FD clients and HD clients in the same WLAN. We refer to this type of WLAN as a heterogeneous WLAN (Het-WLAN). In this paper, we propose an FD-MAC for Het-WLAN, which considers all possible types of FD transmissions. Our proposed FD-MAC protocol suppresses inter-user interference. Simulation results demonstrated that a significant throughput gain (about 96%) could be achieved by using our proposed FD-MAC compared with traditional HD communications. Moreover, our proposed MAC obtained better performance (average throughput gain of about 11%) compared with another existing FD-MAC design. In addition, probability analysis suggested that the total probability of FD transmissions increased rapidly as the WLAN approached saturation conditions. Full-duplex; MAC protocol; Het-WLAN; FD-MAC 1 Introduction In general, traditional radio transceivers cannot transmit and receive simultaneously using the same frequency band because of self-interference at the receiver end. However, recent technological advances in antenna design and radio frequency interference cancellation techniques can reduce self-interference by up to 110 dB [1]. Similar studies have also been conducted regarding the physical layer by [2–4]. The latest technologies for self-interference cancellation allow us to transmit and receive signals simultaneously using the same frequency, which is known as in-band full-duplex (IBFD) communication [5]. However, a suitable medium access control (MAC) is crucial to exploit the full advantages of IBFD technology in wireless local area networks (WLANs) because the current IEEE standard MAC protocols do not support IBFD communications. IBFD is one of the techniques with the greatest potential for supporting the huge traffic demands in the near future, and researchers are attracted to IBFD because it can increase the spectral efficiency without requiring any additional frequency resources [5]. IBFD can also double the ergodic capacity of a multiple-input multiple-output system [1, 3]. IBFD wireless communication can be categorized as bidirectional FD (BFD), three node FD (TNFD), or relay FD (RFD) [5, 6]. BFD and TNFD are illustrated in Fig. 1. Two nodes comprising the primary transmitter (PT) and primary receiver (PR) transmit to and receive from each other simultaneously (Fig. 1a) in BFD. TNFD can be described as destination-based TNFD or source-based TNFD. In destination-based TNFD, PT transmits a signal to PR and PR also transmits a signal to another secondary receiver (SR) while receiving data from PT (Fig. 1b). In this case, PR also acts as a secondary transmitter (ST). In source-based TNFD, PT transmits data to PR and ST also transmits data to PT (Fig. 1c). In this case, PT also acts as a SR. However, in RFD, a user terminal sends data to the destination using a relaying node [5]. In this study, we consider three modes of transmission, i.e., half-duplex (HD), BFD, and TNFD. © The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Fig. 1 a BFD, b destination-based TNFD, and c source-based TNFD All of the user terminals or nodes in existing WLANs are traditional HD capable. Therefore, it is not possible to replace all of these HD nodes (HDNs) with FD nodes (FDNs) overnight, so it is necessary to incorporate FDNs in existing WLANs in a manner that allows HDNs and FDNs to operate simultaneously. A WLAN that comprises HDNs and FDNs is referred to as a heterogeneous WLAN (Het-WLAN) because it has different types of clients or nodes. In this paper, we propose an FD-MAC for Het-WLAN, which we call HFD-MAC. The basic structure of HetWLAN is shown in Fig. 2, (...truncated)


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Md. Abdul Alim, Makoto Kobayashi, Shunsuke Saruwatari, Takashi Watanabe. In-band full-duplex medium access control design for heterogeneous wireless LAN, EURASIP Journal on Wireless Communications and Networking, 2017, pp. 83, Volume 2017, Issue 1, DOI: 10.1186/s13638-017-0867-6