Distributed Power and Channel Allocation for Cognitive Femtocell Network Using a Coalitional Game in Partition-Form Approach

Tuan LeAnh, Nguyen H. Tran, Sungwon Lee, Eui-Nam Huh, Zhu Han, Choong Seon Hong
2017 IEEE Transactions on Vehicular Technology  
The cognitive femtocell network (CFN) integrated with cognitive radio-enabled technology has emerged as one of the promising solutions to improve wireless broadband coverage in indoor environment for next-generation mobile networks. In this paper, we study a distributed resource allocation that consists of subchannel-and power-level allocation in the uplink of the two-tier CFN comprised of a conventional macrocell and multiple femtocells using underlay spectrum access. The distributed resource
more » ... llocation problem is addressed via an optimization problem, in which we maximize the uplink sum-rate under constraints of intra-tier and inter-tier interferences while maintaining the average delay requirement for cognitive femtocell users. Specifically, the aggregated interference from cognitive femto users to the macrocell base station is also kept under an acceptable level. We show that this optimization problem is NP-hard and propose an autonomous framework, in which the cognitive femtocell users self-organize into disjoint groups (DJGs). Then, instead of maximizing the sum-rate in all cognitive femtocells, we only maximize the sum-rate of each DJG. After that, we formulate the optimization problem as a coalitional game in partition form, which obtains sub-optimal solutions. Moreover, distributed algorithms are also proposed for allocating resources to the CFN. Finally, the proposed framework is tested based on the simulation results and shown to perform efficient resource allocation.
doi:10.1109/tvt.2016.2536759 fatcat:o6ulqpvq7zckxahfpzxp2vnas4