DocumentCode :
3564913
Title :
Multi-user downlink resource allocation with per-base station power constraints
Author :
Chitti, Krishna ; Xiaochen Tan ; ten Brink, Stephan
Author_Institution :
Inst. of Telecommun., Univ. of Stuttgart, Stuttgart, Germany
fYear :
2014
Firstpage :
13
Lastpage :
17
Abstract :
The problem of Downlink (DL) sum-rate maximization with required Quality of service (QoS) for a multi-cell, multi-user with per-Base Station (BS) power constraints is solved by an Interior Point Method (IPM). Further, by changing only the objective in the formulation, the problem of DL sum-power minimization with QoS is also solved. For a single-cell, the concept of duality and virtual uplink (VUL) is well understood to solve the DL problem. This cannot be extended to the multi-cell case with per-BS power constraints, also, the total sum-power on the DL and VUL may not be equal as in the single-cell. For a multi-cell, Lagrange-duality is applied to satisfy the power constraints, where the VUL-noise is also an optimization variable. In this paper, the implicit Lagrange-duality in the IPM is used to solve the equivalent VUL problem. With this reformulation, the need to treat VUL-noise as an optimization variable is eliminated. Single-cell duality requirement of equal total sum-power on DL and VUL is also satisfied. Numerical results show that the obtained VUL optimum satisfies the DL constraints thereby satisfying the multi-cell duality.
Keywords :
cellular radio; duality (mathematics); minimisation; multi-access systems; quality of service; resource allocation; DL sum-power minimization; IPM; Lagrange-duality concept; QoS; VUL noise; downlink sum-rate maximization; interior point method; multicell duality; multiuser downlink resource allocation; optimization; per-BS power constraint; per-base station power constraint; quality of service; virtual uplink; Array signal processing; Downlink; Equations; Interference; Minimization; Optimization; Quality of service; duality; interior point method; sum-power; sum-rate; virtual uplink;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications and Vehicular Technology in the Benelux (SCVT), 2014 IEEE 21st Symposium on
Type :
conf
DOI :
10.1109/SCVT.2014.7046700
Filename :
7046700
Link To Document :
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