Interference Aware Full-Duplex MAC Protocols Design and Evaluation for the Next WLANs

Haifeng Luo,Qian Jiang,Yong Liu,Huaixing Wang,Liang Huang 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.6

Recently the in-band full-duplex in wireless communication has evolved into a mature technology since the self-interference cancellation technique is able to support full-duplex capability. Moreover, some researchers focus on the full-duplex media access control (MAC) protocol design for wireless local area networks (WLANs). However, it is assumed that all the node have full-duplex capability in most study of the full-duplex MAC, and it is not practical since stations (STAs) may be half-duplex in the network while access point (AP) has full-duplex capability. In this paper, a full-duplex MAC pro-tocol named interference aware full-duplex MAC (IAFM) is proposed for the next gen-eration WLANs on the assumption only AP has full-duplex capability. In IAFM protocol, there are three mode including direct scheduling mode for normal full-duplex transmis-sion, interference collection mode for interference collection usage and none full-duplex mode for legacy transmission. Beside, direct scheduling mode and interference collec-tion mode are described in detail, and none full-duplex mode obeys the legacy MAC pro-tocol in WLANs. The power control mechanism is also discuss in this paper. The simula-tion results shows that in saturation condition IAFM protocol with power control almost double the throughput of legacy MAC protocol in WLANs.

Joint Subcarrier Assignment and Power Allocation in Full-Duplex OFDMA Networks

Changwon Nam,Changhee Joo,Saewoong Bahk IEEE 2015 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.14 No.6

<P>Recent advances in the physical layer have demonstrated the feasibility of in-band wireless full-duplex which enables a node to transmit and receive simultaneously on the same frequency band. While the full-duplex operation can ideally double the spectral efficiency, the network-level gain of full-duplex in large-scale networks remains unclear due to the complicated resource allocation in multi-carrier and multi-user environments. In this paper, we consider a single-cell full-duplex OFDMA network which consists of one full-duplex base station (BS) and multiple full-duplex mobile nodes. Our goal is to maximize the sum-rate performance by jointly optimizing subcarrier assignment and power allocation considering the characteristics of full-duplex transmissions. We develop an iterative solution that achieves local Pareto optimality in typical scenarios. Through extensive simulations, we demonstrate that our solution empirically achieves near-optimal performance and outperforms other resource allocation schemes designed for half-duplex networks. Also, we reveal the impact of various factors such as the channel correlation, the residual self-interference, and the distance between the BS and nodes on the full-duplex gain.</P>

AUB: A Full-Duplex MAC Protocol for the Efficient Utilization of the Idle Uplink Period in WLAN

ahn, hyeongtae,Lee, Harim,Park, Young Deok 한국통신학회 2023 Journal of communications and networks Vol.25 No.6

Recently, full-duplex radio has attracted attention as a solution for wireless local area networks (WLANs) where traffic is exploding but available frequency bands are insufficient. Full-duplex radio exploits various self-interference cancellation technologies to transmit and receive signals concurrently in the same frequency band. Thus, the efficiency of the frequency band is doubled compared with that of conventional half-duplex radio. However, to effectively exploit full-duplex radio, new problems that do not exist in conventional half-duplex radio, such as full-duplex link setup, inter-node interference avoidance, and idle uplink period (IUP), must be addressed. We propose a full-duplex medium access control (MAC) protocol to effectively exploit full-duplex radio by addressing these problems. In particular, our MAC protocol uses an IUP to transmit an acknowledgment (ACK) frame and report the buffer information of nodes. Accordingly, an access point can gather the node’s buffer information during the IUP and schedule the transmission of nodes without competition. In addition, because the uplink ACK frame is transmitted during the IUP, additional channel usage time for the uplink ACK frame transmission is not required. Therefore, the proposed MAC protocol improves the WLAN throughput by reducing the number of control frame transmissions and the IUP. The results of our performance analysis and simulation show that the MAC protocol achieves throughput improvements compared with those of previous studies.

Resource Allocation in Full-Duplex OFDMA Networks: Approaches for Full and Limited CSIs

Nam, Changwon,Joo, Changhee,Yoon, Sung-Guk,Bahk, Saewoong The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.6

In-band wireless full-duplex is a promising technology that enables a wireless node to transmit and receive at the same time on the same frequency band. Due to the complexity of self-interference cancellation techniques, only base stations (BSs) are expected to be full-duplex capable while user terminals remain as legacy half-duplex nodes in the near future. In this case, two different nodes share a single subchannel, one for uplink and the other for downlink, which causes inter-node interference between them. In this paper, we investigate the joint problem of subchannel assignment and power allocation in a single-cell full-duplex orthogonal frequency division multiple access (OFDMA) network considering the inter-node interference. Specifically, we consider two different scenarios: i) The BS knows full channel state information (CSI), and ii) the BS obtains limited CSI through channel feedbacks from nodes. In the full CSI scenario, we design sequential resource allocation algorithms which assign subchannels first to uplink nodes and then to downlink nodes or vice versa. In the limited CSI scenario, we identify the overhead for channel measurement and feedback in full-duplex networks. Then we propose a novel resource allocation scheme where downlink nodes estimate inter-node interference with low complexity. Through simulation, we evaluate our approaches for full and limited CSIs under various scenarios and identify full-duplex gains in various practical scenarios.

Resource Allocation in Full-Duplex OFDMA Networks: Approaches for Full and Limited CSIs

남창원,주창희,윤성국,박세웅 한국통신학회 2016 Journal of communications and networks Vol.18 No.6

In-band wireless full-duplex is a promising technologythat enables a wireless node to transmit and receive at the sametime on the same frequency band. Due to the complexity of selfinterferencecancellation techniques, only base stations (BSs) areexpected to be full-duplex capable while user terminals remain aslegacy half-duplex nodes in the near future. In this case, two differentnodes share a single subchannel, one for uplink and theother for downlink, which causes inter-node interference betweenthem. In this paper, we investigate the joint problem of subchannelassignment and power allocation in a single-cell full-duplexorthogonal frequency division multiple access (OFDMA) networkconsidering the inter-node interference. Specifically, we considertwo different scenarios: i) The BS knows full channel state information(CSI), and ii) the BS obtains limited CSI through channelfeedbacks from nodes. In the full CSI scenario, we design sequentialresource allocation algorithms which assign subchannels firstto uplink nodes and then to downlink nodes or vice versa. In thelimited CSI scenario, we identify the overhead for channel measurementand feedback in full-duplex networks. Then we proposea novel resource allocation scheme where downlink nodes estimateinter-node interference with low complexity. Through simulation,we evaluate our approaches for full and limited CSIs under variousscenarios and identify full-duplex gains in various practical scenarios.

비대칭 트래픽 환경에서의 전이중 MAC 프로토콜

안형태(Hyeongtae Ahn),김치하(Cheeha Kim) 한국정보과학회 2016 정보과학회 컴퓨팅의 실제 논문지 Vol.22 No.8

최근 자기간섭제거 기술의 발전으로 무선 네트워크에서 전이중통신이 가능하게 되었다. 전이중 통신은 같은 채널에서 동시에 송/수신을 할 수 있기 때문에 차세대 무선통신기술로 주목 받고 있다. 기존 MAC(Medium Access Control) 프로토콜들은 반이중통신을 기반으로 설계되었기 때문에 전이중통신에 적합하지 않다. 따라서 본 논문에서는 전이중 MAC 프로토콜을 설계할 때 고려해야 될 사항에 대해 논의하고, 이를 바탕으로 새로운 전이중 MAC 프로토콜을 제안한다. 시뮬레이션 결과를 통해 제안된 MAC 프로토콜과 기본 전이중통신을 비교하여 성능향상을 확인한다. Recently full-duplex communication in wireless networks is enabled by the advancement of self-interference cancellation technology. Full-duplex radio is a promising technology for nextgeneration wireless local area networks (WLAN) because it can simultaneously transmit and receive signals within the same frequency band. Since legacy medium access control (MAC) protocols are designed based on half-duplex communication, they are not suitable for full-duplex communication. In this paper, we discuss considerations of full-duplex communication and propose a novel full-duplex MAC protocol. We conducted a simulation to measure the throughput of our MAC protocol. Through the simulation results, we can verify that significant throughput gains of the proposed full-duplex MAC protocol, thus comparing the basic full-duplex MAC protocol.

전이중통신에서 단말 간 협력을 이용한 효율적인 패킷 전송 요청 기법

안형태,이하림 한국통신학회 2024 韓國通信學會論文誌 Vol.49 No.4

최근 급격히 증가하는 무선 통신의 트래픽에 비해, 무선랜의 가용 주파수 대역은 현저히 부족하다. 따라서 주파수 대역의 효율성을 증가시킬 수 있는 전이중(full-duplex) 라디오 기술이 주목받고 있다. 전이중 라디오는 송신중에 발생하는 자기 간섭 신호를 잡음단계까지 제거함으로써, 같은 주파수 대역에서 신호를 동시에 송수신할 수있는 무선 기술이다. 하지만 기존 무선랜은 반이중 라디오를 기반으로 설계되었기 때문에, 전이중 라디오를 활용할 수 없다. 따라서 전이중 라디오를 활용하기 위해 새로운 MAC(medium access control) 프로토콜들이 제안되고있으며, 많은 연구에서 스케줄링(scheduling) 기반의 동작 방식을 채택했다. 스케줄링 기반 MAC 프로토콜에서access point(AP)는 각 단말에 슬롯(slot)을 할당하고, 단말은 할당된 슬롯에서 패킷 전송을 요청한다. 이를 통해AP는 단말들의 패킷 전송 요청을 파악하여 각 단말의 패킷 전송을 스케줄링하여 통보하면, 단말들은 스케줄링에따라 패킷을 전송한다. 따라서 충돌 등 단말 간의 채널 접근 경쟁으로 낭비되는 채널 시간 없이 효율적으로 패킷을 전송할 수 있다. 하지만 단말의 숫자가 증가할수록, 단말의 패킷 전송 요청을 확인하기 위한 슬롯의 시간도 비례해서 증가하는 문제가 있다. 본 연구는 이러한 스케줄링 기반 MAC 프로토콜의 문제를 해결하고자, 단말 간 협력을 이용하여 전송 요청 확인에 필요한 슬롯을 절반으로 감소시키는 기법을 제안한다. 본 논문은 가장 대표적인스케줄링 기반 MAC 프로토콜인 Janus를 기반으로 제안된 기법의 동작 방식을 설명하고, 분석 모델과 시뮬레이션을 통해 제안된 기법의 성능을 평가한다. In contrast to the rapidly increasing wireless communication traffic, the available frequency spectrum for wirless local area networks(WLANs) is significantly limited. Therefore, full-duplex radio technology that can increase the efficiency of the frequency spectrum is attracting attention. Full-duplex radio is a wireless technology that can transmit and receive signals simultaneously in the same frequency spectrum by eliminating self-interference signals that occur during transmission. However, because existing WLANs are designed based on half-duplex radio, they cannot utilize full-duplex radio. Therefore, to utilize full-duplex radio in WLANs, a new medium access control(MAC) protocol is required. Several full-duplex MAC protocols have been proposed, and many studies have adopted a scheduling-based operation. In scheduling-based MAC protocols, an access point(AP) assigns a slot to each node, and a node having data to transmit requests packet transmission through the assigned slot. The AP realizes which nodes have data to transmit and schedules their packet transmission, and the nodes transmit packets according to the scheduling. This allows efficient packet transmission without wasting channel time, such as collisions. However, as the number of nodes increases, the slot time to confirm a node's packet transmission request also increases proportionally. To solve this problem, we propose a scheme to halve the number of slots required to confirm packet transmission requests by exploiting inter-node cooperation. This paper describes the operation of the proposed scheme based on Janus, the most representative scheduling-based MAC protocol, and evaluates the performance of the proposed scheme through analytical models and simulations.

An Instantaneous Transmission Mode Analysis in Energy Harvesting for Half-Duplex and Full-Duplex Relaying Network

Tam Nguyen Kieu,Tran Hoang Quang Minh,Thuan Do Dinh,Miroslav Vozňák 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.3

Energy harvesting (EH) based on surrounding radio frequency (RF) has lastly become advanced approach to prolong the lifetime of the wireless networks. This paper deals with energy harvesting architecture of the half duplex and the full duplex relaying networks. By applying time switching based relaying (TSR) protocol and Amplify-and-Forward (AF) scheme, we derive the closed-form expression of the instantaneous throughput and then compare instantaneous throughput of two networks. An important result can be seen clearly that the time fraction, the position of relay, noise at relay, energy conversion factor as well as target rate in TSR impact on their throughput. Finally, numerical results show an efficient relaying strategy in half-duplex and full duplex cooperative networks.

Power allocation for full-duplex NOMA relaying based underlay D2D communications

( Song Li ),( Shuo Li ),( Yanjing Sun ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.1

In this paper, a full-duplex NOMA relaying based underlay device-to-device (D2D) communication scheme is proposed, in which D2D transmitter assists cellular downlink transmission as a full-duplex relay. Specifically, D2D transmitter receives signals from base station and transmits the superposition signals to D2D receiver and cellular user in NOMA scheme simultaneously. Furthermore, we investigate the power allocation under the proposed scheme, aiming to maximize D2D link’s achievable transmit rate under cellular link’s transmit rate constraint and total power constraint. To tackle the power allocation problem, we first propose a power allocation method based on linear fractional programming. In addition, we derive closed-form expressions of the optimal transmit power for base station and D2D transmitter. Simulation results show that the performance of two solutions matches well and the proposed full-duplex NOMA relaying based underlay D2D communication scheme outperforms existing full-duplex relaying based D2D communication scheme.

Optimal Duplex Selection for Decode and Forward Relay Systems with Power Allocation

( Taehoon Kwon ),( Sungmook Lim ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.12

In decode and forward relay systems, choosing the duplex mode is an important factor to the performance. To satisfy the performance requirement, self-interference must be mitigated for the full-duplex relay (FDR), and the resource efficiency must be increased for the half-duplex ratio (HDR). Therefore, if a wise scheme to consider these two factors exists, decode and forward relay systems are used more effectively. This study proposes a new duplex selection scheme for decode and forward relay systems. The proposed duplex selection scheme chooses the better duplex mode according to the channel statistical conditions with optimal power allocation. The simulation results show that the proposed duplex scheme with optimal power allocation has lower outage probability than the FDR and the HDR.