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http://dx.doi.org/10.7840/kics.2014.39B.10.654

QoS-Oriented User Association in HetNet with a Backhaul Constraint  

Yang, Chan S. (Department of Electrical and Computer Engineering, Korea University)
Kang, Chung G. (Department of Electrical and Computer Engineering, Korea University)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.39B, no.10, 2014 , pp. 654-663 More about this Journal
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.
Keywords
HetNet; User Association; Quality of Service (QoS); Backhaul Capacity;
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