Abstract
Two-way relay (TWR) communication, a new cooperation paradigm that allows two terminals to share one relay node to communicate with each other in two phases, has played an increasingly valuable role in wireless networks to meet the stringent throughput requirement. In this paper, we focus on the designing of automatic repeat-request (ARQ) protocols for the two-way wireless relay systems. According to different feedback schedules, we propose three basic ARQ protocols to improve the throughput of two-way relay systems, namely, relay-only ARQ (Ro-ARQ), terminal only ARQ (To-ARQ) and relay-terminal ARQ (RT-ARQ). Through analyzing the outage throughput of these three ARQ protocols, it is verified that all three protocols can improve the system performance. In addition, simulation results reveal that the RT-ARQ protocol has the closest performance to the theoretical throughput upperbound among all given methods without severe deterioration on system complexity.
Highlights
Wireless communication has experienced tremendous progress in the past two decades
The automatic repeat-request (ARQ) protocols in our work are classified into 3 types according to where retransmissions are requested for an erroneous packet: (i) relay-only ARQ (RO-ARQ), where retransmissions are requested at relay and the link reliability from terminals to the relay is guaranteed only, (ii) terminal-only ARQ (TO-ARQ), where only the terminals execute repeat-request, and the end-to-end link between the terminals via relay will affect the performance, and (iii) relay-terminal ARQ (RT-ARQ), which combines the RO-ARQ and TO-ARQ protocol together
Under the protocol of RO-ARQ, the repeat request is only made at the relay node; the model can be studied as a Markov chain with states of relay’s buffer
Summary
Wireless communication has experienced tremendous progress in the past two decades. The development of relative technologies, for example, coding schemes, multiple-input, multiple-output (MIMO), and orthogonal frequency-division multiplexing (OFDM), and so forth, has contributed on accelerating the transmission rate sharply from a few kilo-bits per second (e.g., AMPS) to more than 300 Mb/s (e.g., 3GPP LTE) accompanied with the appearance of high-rate-requiring services [1]. Recent works on two-way relay channels have gained great achievements on promoting its performance These papers [3, 4] mainly demonstrated the application and designing of PNC. Since there are two terminals and one relay in the two-way relay system, different feedback schedules can be designed to meet various transmission conditions for ARQ protocol [14]. For this reason, the ARQ protocols in our work are classified into 3 types according to where retransmissions are requested for an erroneous packet:.
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