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| This paper considers the cross-layer design for delayquality-of-service (QoS) provisioning in two-way relay systems. Theaim is to find the optimal cross-layer resource allocation policy tomaximize the weighted sum-rate of the considered two-way relaysystem while guaranteeing the bounded delay-QoS constraints for bothusers. By applying the concept of effective capacity, the delayrequirements are characterized as the statistical QoS exponents,which are the only information exchanged between layers. Thecross-layer optimization problem then is equivalent to a weightedsum effective capacity maximization problem. The optimal joint powerand rate adaptation policy for the two-phase two-way relaying isderived. Numerical results show that the proposed policy canefficiently support diverse QoS requirements and significantlyimprove the performance compared with either the fixed power schemeor the conventional weight-based method. |
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| Keywords:Wireless communication, cross-layer optimization,two-way relaying, quality-of-service (QoS), effective capacity,resource allocation |
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