User grouping and admission control for multi-group multicast beamforming in MIMO systems
User grouping and admission control for multi-group multicast beamforming in MIMO systems
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DOI：
10.1007/s11276-017-1510-5
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发表时间：
2017-04
影响因子：
3
通讯作者：
B. Hu;Cunqing Hua;Cailian Chen;X. Guan
中科院分区：
文献类型：
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作者：
B. Hu;Cunqing Hua;Cailian Chen;X. Guan
在本文中，我们考虑了 MIMO 无线蜂窝系统中的多组多播问题，其中基站可以生成多个波束方向图来同时服务多个组。每个用户对多个多播组感兴趣，但在每个传输间隔期间最终只允许被分配到其中一个。我们将其表述为多播波束形成器设计和用户分组的联合优化问题，并且准入控制也被认为考虑到单个用户的服务质量需求。为了解决这个NP难问题，我们采用大M公式化方法和半定松弛方案将其重新公式化为混合整数半定规划问题。开发了三种算法来解决具有不同计算成本的近似问题。仿真结果证明了所提出的算法在允许用户数量、功耗和计算时间方面的性能。
In this paper, we consider the multi-group multicasting problem in a MIMO wireless cellular system, whereby the base station can generate multiple beampatterns to serve multiple groups simultaneously. Each user is interested in multiple multicast groups, but is only allowed to be assigned to one of them eventually during each transmission interval. We formulate it as a joint optimization problem of multicast beamformer design as well as user grouping, and admission control is also considered to account for the quality of service demands of individual users. To deal with this NP-hard problem, we adopt the big-M formulation method and the semidefinite relaxation scheme to reformulate it to a mixed-integer semidefinite programming problem. Three algorithms are developed to solve the obtained approximate problem with different computational costs. Simulation results are presented to demonstrate the performance of the proposed algorithms in terms of the number of admitted users, power consumption and computation time.