Protocol Design and Resource Allocation for LTE-U System Utilizing Licensed and Unlicensed Bands

Protocol Design and Resource Allocation for LTE-U System Utilizing Licensed and Unlicensed Bands

Blog Article

LTE deployed with both licensed and unlicensed bands (LTE-U) is one of the promising approaches to meet the rapidly growing data demand in wireless networks.In this paper, both throughput and fairness for the LTE-U system are maximized by a multi-objective optimization problem.Then, a log-sum-exp approximation method is developed to convert the multi-objective optimization into a single objective optimization problem.At the same time, the Armored Vehicle Kit tradeoff between throughput and fairness is mathematically depicted by a control parameter.To tackle the obtained single objective optimization problem, a Markov chain directed algorithm is developed to convert it into a coexistence protocol design subproblem at the MAC layer and a resource allocation subproblem at the physical layer, respectively.

Then, we propose adaptive exponential backoff schemes for both the LTE-U devices and the incumbent devices on the unlicensed bands.After that, a low-complexity two-iterative optimization procedure is developed to jointly allocate the licensed and unlicensed resources of the LTE-U system.The simulation results show that our proposed coexistence protocol and resource allocation can achieve fair coexistence between the LTE-U devices and the Military Airplane incumbent devices on the unlicensed bands, moreover it can achieve higher throughput than the non-adaptive coexistence protocol in the unlicensed bands.