Theoretical Analysis of Hybrid Buffer-Aided Cooperative Protocol Based on Max–Max and Max–Link Relay Selections

Oiwa, Miharu; Tosa, Chie; Sugiura, Shinya

doi:10.1109/tvt.2016.2521062

Cited by 52 publications

(44 citation statements)

References 26 publications

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“…Then, max − link algorithm with adaptive link selection was proposed in [21], providing increased diversity, by dedicating each time-slot to either an {S→R} or to an {R→D} transmission. A hybrid MMRS/max − link algorithm was presented in [22], while other works provided delay-aware algorithms (see, e.g., [23]- [28]), prioritizing {R→D} transmissions and/or considering buffer state information (BSI) for relay selection. Moreover, to further improve the diversity of BA relaying, various works imposed thresholds at the buffers, in terms of the number of packets, activating relays satisfying those thresholds [29], [30].…”

Section: A Backgroundmentioning

confidence: 99%

Hybrid NOMA/OMA With Buffer-Aided Relay Selection in Cooperative Networks

Νομικός

Charalambous

Vouyioukas

et al. 2019

IEEE J. Sel. Top. Signal Process.

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Non-orthogonal multiple access (NOMA) aims to increase the spectral efficiency of fifth generation (5G) networks by relaxing the orthogonal use of radio-resources. In this work, a network with multiple half-duplex (HD) buffer-aided (BA) relays is considered, where the source transmits with fixed rate towards two users. The users might demand the same rate by the source (e.g., two cellular users requiring the same service), or they could have different rate requirements (e.g., a cellular user coexisting with an Internet of Things (IoT) device). By deploying multiple BA relays, increased reliability and additional degrees of freedom are provided. Leveraging the spectral efficiency of NOMA and the increased diversity gain of BA relaying, two relay selection algorithms with broadcasting are proposed for power-domain (PD) NOMA and hybrid NOMA/OMA, namely BA-NOMA and BA-NOMA/OMA, respectively. BA-NOMA can improve the performance in terms of outage probability when the power allocation factor α is selected such that robustness against channel uncertainties due to, e.g., outdated channel state information (CSI), is provided. Moreover, BA-NOMA/OMA further improves the sum-rate by switching to OMA when the relays cannot serve the users through NOMA. For both cases, a theoretical analysis for the outage probability is conducted and the asymptotic performance is studied. Finally, numerical results and comparisons with other state-of-the-art algorithms are provided for the outage probability, average throughput and average delay.

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Section: A Backgroundmentioning

confidence: 99%

Hybrid NOMA/OMA With Buffer-Aided Relay Selection in Cooperative Networks

Νομικός

Charalambous

Vouyioukas

et al. 2019

IEEE J. Sel. Top. Signal Process.

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“…All channels encounter independently and identically distributed (i.i.d.) Rayleigh fading as in most of the existing schemes [1,4,7,10,12,20]. The fading envelop of a hop is fixed for a particular time slot and differs from one time slot to another.…”

Section: Channel Modelmentioning

confidence: 99%

“…Relay selection is based on the most powerful channel within a priority class. Similarly, the authors in [10] proposed a hybrid of max-max and Max-Link schemes. In this scheme, the diversity gain of twice the number of relays is obtained using fixed transmission law.…”

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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“…In [16], the relay associated with the largest weight is selected among the qualified source-relay and relay-destination links, where each link is assigned with a weight related to the buffer status. In [17], motivated by the Max-Link and the Max-Max protocols, a hybrid buffer-aided cooperative protocol that attains the benefits of reliability and reduced packet delay is reported. In [18], a delay and diversity-aware buffer-aided relay selection policy that reduces the average delay and obtains a good diversity gain is proposed.…”

Section: A Prior and Related Workmentioning

confidence: 99%

Cloud-Aided Max-Link Relay Selection for Two-Way Cooperative Multi-Antenna Systems

Duarte

Lamare

2019

2019 53rd Asilomar Conference on Signals, Systems, and Computers

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In this work, we present a switched relaying framework for multiple-input multiple-output (MIMO) relay systems where a source node may transmit directly to a destination node or aided by relays. We also investigate relay selection techniques for the proposed switched relaying framework, whose relays are equipped with buffers. In particular, we develop a novel relay selection protocol based on switching and the selection of the best link, denoted as Switched Max-Link. We then propose the Maximum Minimum Distance (MMD) relay selection criterion for MIMO systems, which is based on the optimal Maximum Likelihood (ML) principle and can provide significant performance gains over other criteria, along with algorithms that are incorporated into the proposed Switched Max-Link protocol. An analysis of the proposed Switched Max-Link protocol and the MMD relay selection criterion in terms of computational cost, pairwise error probability, sum-rate and average delay is carried out. Simulations show that Switched Max-Link using the MMD criterion outperforms previous works in terms of sum-rate, pairwise error probability, average delay and bit error rate.

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Theoretical Analysis of Hybrid Buffer-Aided Cooperative Protocol Based on Max–Max and Max–Link Relay Selections

Cited by 52 publications

References 26 publications

Hybrid NOMA/OMA With Buffer-Aided Relay Selection in Cooperative Networks

Hybrid NOMA/OMA With Buffer-Aided Relay Selection in Cooperative Networks

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

Cloud-Aided Max-Link Relay Selection for Two-Way Cooperative Multi-Antenna Systems

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