Convexity of some feasible QoS regions and asymptotic behavior of the minimum total power in CDMA systems
Convexity of some feasible QoS regions and asymptotic behavior of the minimum total power in CDMA systems
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DOI：
10.1109/tcomm.2004.838725
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发表时间：
2004-12
影响因子：
8.3
通讯作者：
H. Boche;S. Stańczak
中科院分区：
文献类型：
--
作者：
H. Boche;S. Stańczak
链路调度和功率控制是无线网络中为各个用户提供服务质量（QoS）的有效机制。当开发最佳访问控制策略时，对可行QoS区域的几何形状的良好理解是必不可少的。特别是，如果可行的QoS区域是一个凸集，调度的效果是更喜欢同时传输的用户。此外，凸性性质在最优功率控制策略的发展中起着关键作用。本文给出了系统在有功率约束和无功率约束时可行QoS域凸性的充分条件。此外，我们证明了必要条件的QoS要求的可行性，以更好地了解最佳的QoS权衡。最后，本文提供了深入了解QoS要求和最小传输功率，以满足他们之间的相互关系。虽然这些结果是在功率控制的码分多址系统中得到的，但它们也适用于其他一些通信系统。一个关键的假设是，在感兴趣的QoS参数（数据速率、服务延迟等）与QoS参数之间存在一对一的关系。以及线性接收机输出端的信干比。
Link scheduling and power control are efficient mechanisms to provide quality-of-service (QoS) to individual users in wireless networks. When developing optimal access-control strategies, a good understanding of the geometry of the feasible QoS region is essential. In particular, if the feasible QoS region is a convex set, the effect on scheduling is to prefer simultaneous transmission of users. Moreover, the convexity property plays a key role in the development of optimal power-control strategies. This paper provides sufficient conditions for the convexity of the feasible QoS region in systems with and without power constraints. Furthermore, we prove necessary conditions for the feasibility of QoS requirements to better understand the optimal QoS tradeoff. Finally, the paper provides insight into the interrelationship between QoS requirements and the minimum transmission power necessary to meet them. Although the results are obtained in the context of a power-controlled code-division multiple-access system, they also apply to some other communications systems. A key assumption is that there is a one-to-one relationship between a QoS parameter of interest (data rate, service delay, and etc.) and the signal-to-interference ratio at the output of a linear receiver.