Adaptive mode selection in bidirectional buffer-aided relay networks with fixed transmit powers

Vahid Jamali, Nikola Zlatanov, Aissa Ikhlef, Robert Schober

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch

4 Citations (Scopus)


We consider a bidirectional network in which two users exchange information with the help of a buffer-aided relay. In such a network without direct link between user 1 and user 2, there exist six possible transmission modes, i.e., four point-to-point modes (user 1-to-relay, user 2-to-relay, relay-to-user 1, relay-to-user 2), a multiple access mode (both users to the relay), and a broadcast mode (the relay to both users). Because of the buffering capability at the relay, the transmissions in the network are not restricted to adhere to a predefined schedule, and therefore, all the transmission modes in the bidirectional relay network can be used adaptively based on the instantaneous channel state information (CSI) of the involved links. For the considered network, assuming fixed transmit powers for both the users and the relay, we derive the optimal transmission mode selection policy which maximizes the sum rate. The proposed policy selects one out of the six possible transmission modes in each time slot based on the instantaneous CSI. Simulation results confirm the effectiveness of the proposed protocol compared to existing protocols.

Original languageEnglish
Title of host publication2013 21st European Signal Processing Conference (EUSIPCO 2013)
Subtitle of host publicationarrakech, Morocco; 9-13 September 2013
Place of PublicationPiscataway NJ USA
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages5
ISBN (Electronic)9780992862602
ISBN (Print)9781479936878
Publication statusPublished - 2013
Externally publishedYes
EventEuropean Signal Processing Conference 2013 - Palais des Congres, Marrakech, Morocco
Duration: 9 Sept 201313 Sept 2013
Conference number: 21st (Proceedings)


ConferenceEuropean Signal Processing Conference 2013
Abbreviated titleEUSIPCO 2013
Internet address

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