Buffer-Aided Relay Selection With Equal-Weight Links in Cooperative Wireless Networks

Raza, Waseem; Javaid, Nadeem; Nasir, Hina; Alrajeh, Nabil; Guizani, Nadra

doi:10.1109/lcomm.2017.2756833

Cited by 26 publications

(22 citation statements)

References 8 publications

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“…In addition, a modified max-link relay selection scheme has also been proposed, in which the direct link between the source and destination was exploited to achieve a significant performance gain in terms of diversity and delay [9]. And a general relay selection factor including the weight of the link and the link quality was defined in [10]. It is worth noting that the relay selected with the adaptive link selection policies varies with the instantaneous channel state information (CSI), which may introduce more complexities in practical implement.…”

Section: Introductionmentioning

confidence: 99%

Alternate Distributed Beamforming for Decode-and-Forward Multi-Relay Systems Using Buffers

Zhou

Qiao

2020

2020 International Conference on Computing, Networking and Communications (ICNC)

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1 In this paper, link selection for half-duplex bufferaided relay systems is revisited. A new fixed scheduling policy referred as alternate distributed beamforming (ADB) is proposed, in which the relays are divided into two groups, with one group receiving the same information broadcast from the source and the other group transmitting the common messages to the destination via distributed beamforming in each time slot. It is worth noting that the relays used for reception and transmission are determined without the need of instantaneous channel state information (CSI). Theoretical analysis of the achievable throughput of the proposed scheme in Rayleigh fading is provided and the approximate closed-form expressions are derived. Through numerical results, it is shown that compared with existing link selection policies, the proposed fixed scheduling ADB achieves a significant improvement in achievable throughput.

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Section: Introductionmentioning

confidence: 99%

Alternate Distributed Beamforming for Decode-and-Forward Multi-Relay Systems Using Buffers

Zhou

Qiao

2020

2020 International Conference on Computing, Networking and Communications (ICNC)

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“…When C1 is most suitable, the corresponding relay collects in its buffer and when C2 is fittest, the corresponding relay forwards from its buffer. The schemes based on dynamic schedule achieve best diversity gain corresponding to twice the number of relays [4,[6][7][8]. In this work, our focus is on dynamic schedule.…”

Section: Introductionmentioning

confidence: 99%

“…The drop in the active channels contributes to an increase in the outage probability of the system. Considering this, the authors in [5,7,8,11] propose to select buffer occupancy as the second criteria for relay selection. The schemes viewing buffer occupancy are referred to as buffer state-based relay selection schemes.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Packet Diversity in Buffer-Aided Relaying over Symmetric and Asymmetric Rayleigh Fading Channels

et al. 2020

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In this paper, we propose innovative schemes for relay selection that jointly explore packet selection and relay selection for buffer-aided amplify and forward (AF) cooperative relaying networks. The first proposed scheme chooses the most suitable channel based on link quality from all active channels, i.e., channels with neither empty nor full corresponding buffers. In the second proposed scheme, the most suitable channel is chosen based on buffer status. When the source-relay channel is determined, the corresponding relay collects data in the buffer. Likewise, when the relay-destination channel is picked, the most suitable packet is dispatched from the buffer. The most suitable packet is one that provides the highest end-to-end equivalent signal-to-noise ratio. We simulated the outage probability, average throughput and packet delay and analyzed the proposed protocol for both symmetric and asymmetric channel conditions. Comparison is made against the existing buffer-aided schemes. The results show that the proposed relay and packet selection systems help to reduce the outage probability, diversity gain and delay.

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“…The optimization techniques designed for memoryless relaying nodes cannot be applied for BAR transmission. Thus, the problem of power allocation and link selection for the BAR has received significant attention in the research community [10][11][12][13][14][15][16][17][18][19][20]. Considering a full-duplex network, power allocation at the source and relay node was studied in [10].…”

mentioning

confidence: 99%

“…Further, the authors in [15] studied the security and the delay issues in the buffer enhanced dual-hop transmission. The relay selection schemes for links with equal weights have recently been explored in [16]. Depending on the status of the buffer at each relaying node, the authors in [17] proposed a max-link selection analysis framework.…”

mentioning

confidence: 99%

Joint Power Allocation and Link Selection for Multi-Carrier Buffer Aided Relay Network

et al. 2019

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In this paper, we present a joint power allocation and adaptive link selection protocol for an orthogonal frequency division multiplexing (OFDM)-based network consists of one source node i.e., base station (BS), one destination node i.e., (MU) and a buffer aided decode and forward (DF) relay node. Our objective is to maximize the average throughput of the system via power loading over different subcarriers at source and relay nodes. A separate power budget is assumed at each transmitting node to make the system more practical. In order to form our solution more tractable, a decomposition framework is implemented to solve the mixed integer optimization problem. Further, less complex suboptimal approaches have also been presented and simulation results are provided to endorse the efficiency of our designed algorithms.Buffer aided relaying (BAR) emerged as a new paradigm for the wireless communication systems and has provided freedom to the link selection, i.e., the choice to choose a particular hop for transmission in a given time slot [9]. With this addition, the resource allocation problem becomes more challenging and is coupled with the link selection. The optimization techniques designed for memoryless relaying nodes cannot be applied for BAR transmission. Thus, the problem of power allocation and link selection for the BAR has received significant attention in the research community [10][11][12][13][14][15][16][17][18][19][20]. Considering a full-duplex network, power allocation at the source and relay node was studied in [10]. Authors maximized the source arrival rate under the assumption of imperfect self-interference cancellation and statistical delay constraints. For the underlay cognitive radio network with buffer aided DF relay, an adaptive link selection scheme was presented in [11]. A closed-form expression for the data rate was derived by assuming peak power and interference constraints at the secondary nodes. The authors in [12] considered a system where multiple source nodes are communicating with a single destination through a common BAR. Under the total transmit power constraint at each node, this work presented a link selection and a power allocation strategy.The problem of cross-layer resource allocation considering asymmetric time duration over two hops was investigated in [13]. The work in [14] proposed different BAR schemes under full-duplex (FD) relay transmission with self-interference cancellation (SIC) capability at the relaying node. The results showed the considerable gains of the proposed scheme over the conventional FD relay transmission. Further, the authors in [15] studied the security and the delay issues in the buffer enhanced dual-hop transmission. The relay selection schemes for links with equal weights have recently been explored in [16]. Depending on the status of the buffer at each relaying node, the authors in [17] proposed a max-link selection analysis framework. With the Markov chain approach, analytical expressions for the outage probability, the average bit error rate, a...

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Buffer-Aided Relay Selection With Equal-Weight Links in Cooperative Wireless Networks

Cited by 26 publications

References 8 publications

Alternate Distributed Beamforming for Decode-and-Forward Multi-Relay Systems Using Buffers

Alternate Distributed Beamforming for Decode-and-Forward Multi-Relay Systems Using Buffers

Analysis of Packet Diversity in Buffer-Aided Relaying over Symmetric and Asymmetric Rayleigh Fading Channels

Joint Power Allocation and Link Selection for Multi-Carrier Buffer Aided Relay Network

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