Cross-layer optimization and design based on QoS guarantees in the relay system
Qianbin Chen · Journal of Xidian University · 2013
In order to improve the throughput and guarantee the quality-of-service(QoS) for a relay system,a cross-layer design scheme which combines adaptive modulation and coding(AMC) at the physical layer with cooperative hybrid automatic repeat request(CHARQ) at the link layer is proposed over the Nakagami-m fading channel.Firstly,the system packet loss rate(PLR) is described and analyzed through the state transition diagram.Then,the queuing delay is derived using the queuing theory.Moreover,a cross-layer model for maximizing system throughput is presented under the constraints of PLR,queuing delay and transmission delay.Numerical results show that the cross-layer design scheme combining CHARQ with AMC can achieve the optimal throughput,the smallest PLR and the shortest queuing delay and transmission delay.