Abstract
In a heterogeneous network (HetNet) with a large number of low power base stations (BSs), proper user-BS association and power control is crucial to achieving desirable system performance. In this paper, we systematically study the joint BS association and power allocation problem for a downlink cellular network under the max-min fairness criterion. First, we show that this problem is NP-hard. Second, we show that the upper bound of the optimal value can be easily computed, and propose a two-stage algorithm to find a high-quality suboptimal solution. Simulation results show that the proposed algorithm is near-optimal in the high-SNR regime. Third, we show that the problem under some additional mild assumptions can be solved to global optima in polynomial time by a semi-distributed algorithm. This result is based on a transformation of the original problem to an assignment problem with gains log(gij), where {gij} are the channel gains.
Original language | English (US) |
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Pages (from-to) | 1040-1054 |
Number of pages | 15 |
Journal | IEEE Journal on Selected Areas in Communications |
Volume | 33 |
Issue number | 6 |
DOIs | |
State | Published - Jun 1 2015 |
Externally published | Yes |
Keywords
- Base station association
- Distributed algorithm
- Downlink interference channel
- Polynomial time solvable
- Power control
ASJC Scopus subject areas
- Computer Networks and Communications
- Electrical and Electronic Engineering