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Preface; Contents; Acronyms; 1 Introduction; 1.1 Motivation; 1.2 Resource Allocation Under Delay Constraints; 1.3 Structure of the Brief; References; 2 Power Allocation Over Fading Channels Under Delay Constraints: A Review; 2.1 Average Delay Constraint; 2.2 Delay-Outage Constraint; 2.2.1 Asymptotic Delay Analysis; 2.2.2 Effective Capacity; 2.2.3 EC-Based Resource Allocation and Performance Analysis; 2.3 Energy Harvesting Communications Systems; 2.4 Buffer-Aided Relaying Communications; 2.4.1 Half-Duplex Relaying with Adaptive Link Selection; 2.4.1.1 Case of Unconstrained Delay.

2.4.1.2 Case of Average Delay Constraint2.4.2 Full-Duplex Relaying; References; 3 Joint Data Admission Control and Power Allocation Over Fading Channel Under Average Delay Constraint; 3.1 System Model and Problem Formulation; 3.1.1 Model Description; 3.1.2 Problem Formulation; 3.1.3 Optimal Throughput-Delay Trade-Off; 3.2 Joint Data Admission Control-Power Allocation; 3.2.1 MDP-Based Optimal Solution; 3.2.2 Post-decision State-Value Function Approach; 3.2.3 Structural Results; 3.2.4 Online Algorithm; 3.3 Illustrative Results; 3.3.1 Settings; 3.3.2 Numerical Results; References.

4 Power Allocation with Energy Harvesting Over Fading Channel Under Statistical Delay Constraints4.1 System Model and Problem Formulations; 4.1.1 Model Description; 4.1.2 Problem Formulations; 4.2 Power Allocation Under Average Delay Constraint ; 4.2.1 Optimal Allocation Solution ; 4.2.2 Online Algorithm; 4.2.3 Baseline Transmission Schemes; 4.3 Power Allocation Under Delay-Outage Constraint ; 4.3.1 Effective Capacity Maximization ; 4.3.1.1 Post-decision State-Value Function Approach ; 4.3.2 Online Algorithm ; 4.3.3 Baseline Transmission Schemes; 4.4 Illustrative Results.

4.4.1 Average Delay Constraint4.4.2 Delay-Outage Constraint; 4.4.3 Average Delay Versus Delay-Outage Constraints; 4.4.4 Convergence Study of the Online Algorithms; References; 5 Resource Allocation for Buffer-Aided Half-Duplex Relaying Under Delay-Outage Constraint; 5.1 System Model and Problem Formulation; 5.1.1 Model Description; 5.1.2 Problem Formulation; 5.2 Delay-Outage Constraint Transformation; 5.2.1 Asymptotic Delay Analysis for Buffer-Aided Relaying Network; 5.2.2 Delay-Outage Constraint Transformation; 5.3 Adaptive Link Scheduling with Fixed Power Allocation; 5.3.1 Optimal Solution.

5.3.2 Special Cases5.3.2.1 Case of Very Loose Delay Constraints; 5.3.2.2 Case of Very Stringent Delay Constraints; 5.3.2.3 Case of Negligible Fading Variation; 5.3.2.4 Case of Similar Link Fading Distributions; 5.3.2.5 Rayleigh Fading Links; 5.3.2.6 Illustration; 5.3.3 Comparison Benchmarks; 5.3.3.1 QoS-Aware B-HD-FLS; 5.3.3.2 QoS-Blind B-HD-ALS; 5.3.3.3 Non-buffer Relaying; 5.4 Adaptive Link Scheduling with Adaptive Power Allocation; 5.4.1 Optimal Solution; 5.4.2 Special Cases; 5.4.2.1 Case of Very Loose Delay Constraints; 5.4.2.2 Case of Very Stringent Delay Constraints.

This SpringerBrief presents radio resource allocation schemes for buffer-aided communications systems over fading channels under statistical delay constraints in terms of upper-bounded average delay or delay-outage probability. This Brief starts by considering a source-destination communications link with data arriving at the source transmission buffer. The first scenario, the joint optimal data admission control and power allocation problem for throughput maximization is considered, where the source is assumed to have a maximum power and an average delay constraints. The second scenario, optimal power allocation problems for energy harvesting (EH) communications systems under average delay or delay-outage constraints are explored, where the EH source harvests random amounts of energy from renewable energy sources, and stores the harvested energy in a battery during data transmission. Online resource allocation algorithms are developed when the statistical knowledge of the random channel fading, data arrivals, EH processes governing the system dynamics is unknown a-priori. This Brief continues with a source-relay-destination communications link with buffers available at both source and relay, as part of a multi-hop network. Optimal resource allocation schemes for this 3-node relaying system to maximize its effective capacity under a delay-outage constraint are proposed, with special emphasis on relay roles: Half-duplex (HD) or full-duplex (FD) relay operation. With HD relay, the adaptive link selection relaying problem jointly with both fixed and adaptive power allocation schemes is investigated. Within each transmission frame, either the source-relay link or the relay-destination link is selected to be active depending on the channel conditions. With FD relay under the presence of non-zero residual self-interference (SI). This Brief also presents source and relay power allocation schemes for both cases of available knowledge of the channel state information at transmitter (CSIT): instantaneous or statistical. Professional and researchers working in this related field and advanced-level students in electrical or computer engineering will find the content valuable as a reference.