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We consider a cooperative relaying system which consists of a number ofsource terminals, one shared relay, and a common destination with multi-packetreception (MPR) capability. In this paper, we study the stability and delayanalysis for two cooperative relaying schemes; the sensing-based cooperative(SBC) scheme and the decision-based cooperative (DBC) scheme. In the SBCscheme, the relay senses the channel at the beginning of each time slot. In theidle time slots, the relay transmits the packet at the head of its queue, whilein the busy one, the relay decides either to transmit simultaneously with thesource terminal or to listen to the source transmission. The SBC scheme is anovel paradigm that utilizes the spectrum more efficiently than the othercooperative schemes because the relay not only exploits the idle time slots,but also has the capability to mildly interfere with the source terminal. Onthe other hand, in the DBC scheme, the relay does not sense the channel and itdecides either to transmit or to listen according to certain probabilities.Numerical results reveal that the two proposed schemes outperform existingcooperative schemes that restrict the relay to send only in the idle timeslots. Moreover, we show how the MPR capability at the destination cancompensate for the sensing need at the relay, i.e., the DBC scheme achievesalmost the same stability region as that of the SBC scheme. Furthermore, wederive the condition under which the two proposed schemes achieve the samemaximum stable throughput.

Sensing/Decision-Based Cooperative Relaying Schemes With Multi-Access Transmission: Stability Region And Average Delay Characterization