Buffer-Aided Relaying with Adaptive Link Selection

Abstract

In this paper, we consider a simple network consisting of a source, a half-duplex decode-and-forward relay, and a destination. We propose a new relaying protocol employing adaptive link selection, i.e., in any given time slot, based on the channel state information of the source-relay and the relay-destination link a decision is made whether the source or the relay transmits. In order to avoid data loss at the relay, adaptive link selection requires the relay to be equipped with a buffer such that data can be queued until the relay-destination link is selected for transmission. We study both delay constrained and delay unconstrained transmission. For the delay unconstrained case, we characterize the optimal link selection policy, derive the corresponding throughput, and develop an optimal power allocation scheme. For the delay constrained case, we propose to starve the buffer of the relay by choosing the decision threshold of the link selection policy smaller than the optimal one and derive a corresponding upper bound on the average delay. Furthermore, we propose a modified link selection protocol which avoids buffer overflow by limiting the queue size. Our analytical and numerical results show that buffer-aided relaying with adaptive link selection achieves significant throughput gains compared to conventional relaying protocols with and without buffers where the relay employs a fixed schedule for reception and transmission.

IEEE Journal on Selected Areas in Communications; Special Issue on Theories and Methods for Advanced Wireless Relays

Cited by in corpus (24)

• Buffer-Aided Relaying with Adaptive Link Selection - Fixed and Mixed Rate Transmission
• Power Allocation for Conventional and Buffer-Aided Link Adaptive Relaying Systems with Energy Harvesting Nodes
• A Buffer-aided Successive Opportunistic Relay Selection Scheme with Power Adaptation and Inter-Relay Interference Cancellation for Cooperative Diversity Systems
• Buffer-Aided Relaying For The Two-Hop Full-Duplex Relay Channel With Self-Interference
• Achievable Rates for the Fading Half-Duplex Single Relay Selection Network Using Buffer-Aided Relaying
• Achievable Rate Region of the Bidirectional Buffer-Aided Relay Channel with Block Fading
• Performance Comparison Between A Simple Full-Duplex Multi-Antenna Relay And A Passive Reflecting Intelligent Surface
• On Buffer-Aided Multiple-Access Relay Channel
• Throughput Maximization for Mobile Relaying Systems
• Adaptive Mode Selection for Bidirectional Relay Networks -- Fixed Rate Transmission
• Resource Allocation for Mixed RF and Hybrid RF/FSO Relaying
• Adaptive Mode Selection in Bidirectional Buffer-aided Relay Networks with Fixed Transmit Powers
• On Optimal Spectrum Access of Cognitive Relay With Finite Packet Buffer
• Cooperative Wireless Backhauling
• Link Selection for Secure Cooperative Networks with Buffer-Aided Relaying
• Adaptive Mode Selection and Power Allocation in Bidirectional Buffer-aided Relay Networks
• Alternate Distributed Beamforming for Decode-and-Forward Multi-Relay Systems Using Buffers
• Virtual Full-Duplex Buffer-Aided Relaying in the Presence of Inter-Relay Interference
• Study of Buffer-Aided Space-Time Coding for Multiple-Antenna Cooperative Wireless Networks
• Alternate Distributed Beamforming for Buffer-Aided Multi-Antenna Relay Systems
• Decoupled Uplink and Downlink in a Wireless System with Buffer-Aided Relaying
• Sum-Rate Optimization in a Two-Way Relay Network with Buffering
• Stochastic Buffer-Aided Relay-Assisted MEC in Time-Slotted Systems
• Study of Buffer-Aided Distributed Space-Time Coding for Cooperative Wireless Networks