QoS-Oriented User Association in HetNet with a Backhaul Constraint

Abstract

Heterogeneous network (HetNet) with the various types of cells, e.g., with the different cell size and transmit power, has been introduced to improve the cell coverage and areal capacity in cellular mobile communication system. In this paper, we consider a practical situation in which all cells share the same wireless resource while some of them have a limited backhaul capacity. More specifically, we formularize a cell association problem that utilizes the minimum wireless resource while satisfying the quality of service (QoS) of all users in terms of their transmission time constraint, and propose a distributed algorithm to find the optimal solution. In the event of bottleneck at the backhaul link in some small cells, the proposed algorithm off-loads some users to the adjacent cell with the less congested backhaul capacity. Finally, we verify that the proposed algorithm supports the more numbers of users to satisfy the specified level of QoS than the conventional user association scheme under the limited access and backhaul capacities.

Load-Aware Cell Selection Method for Efficient Use of Network Resources

“…이에 따라 셀의 부하를 고려한 접속 셀 선택 기법 의 중요성이 강조되고 있다 [2][3][4][5][6] . 특히, 이종 셀들이 혼 재하는 상황에서 각 셀들의 가용 주파수 자원과 서비 스 제공 방법이 상이해 짐에 따라 셀 부하를 고려한 셀 선택 방법의 중요성은 증가하고 있다 [7,8] .…”