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In this paper, the authors consider the cross-layer design for delay Quality-of-Service (QoS) provisioning in two-way relay systems. They aim to find the optimal resource allocation policy to maximize the weighted sum-rate while guaranteeing the statistical delay-QoS requirements for both users. The delay requirement is characterized as the QoS exponent. With the integration of the concept of effective capacity, the cross-layer optimization problem is equivalent to a weighted sum effective capacity maximization problem. They derive the optimal joint power and rate adaptation policy for the two-phase two-way relaying.
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