A Framework for Uplink Power Control in Cellular Radio Systems
A Framework for Uplink Power Control in Cellular Radio Systems
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DOI：
10.1109/49.414651
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发表时间：
1995-09
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通讯作者：
R. Yates
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作者：
R. Yates
在蜂窝无线通信系统中，通过限制其他用户造成的干扰来调节发射功率，以便为每个用户提供可接受的连接。已经考虑了几种模型，包括：（1）固定基站分配，即用户到基站的分配是固定的；（2）最小功率分配，即用户被迭代地分配到其信干比最高的基站；（3）分集接收，即用户的信号从几个或可能所有基站进行组合。对于上述模型，上行链路功率控制问题可简化为找到满足\(p\geq I(p)\)的用户发射机功率向量\(p\)，其中第\(j\)个约束\(p_j\geq I_j(p)\)描述了用户\(j\)为实现可接受连接必须克服的干扰。这项工作通过识别干扰约束的共同特性，统一了这些系统的研究结果。还表明，发射机功率受最大功率限制的系统也具有这些共同特性。这些特性允许对迭代\(p(t + 1)=I(p(t))\)同步和完全异步收敛到使总发射功率最小的唯一固定点进行一般性证明。
In cellular wireless communication systems, transmitted power is regulated to provide each user an acceptable connection by limiting the interference caused by other users. Several models have been considered including: (1) fixed base station assignment where the assignment of users to base stations is fixed, (2) minimum power assignment where a user is iteratively assigned to the base station at which its signal to interference ratio is highest, and (3) diversity reception where a user's signal is combined from several or perhaps all base stations. For the above models, the uplink power control problem can be reduced to finding a vector p of users' transmitter powers satisfying p/spl ges/I(p) where the jth constraint p/sub j//spl ges/I/sub j/(p) describes the interference that user j must overcome to achieve an acceptable connection. This work unifies results found for these systems by identifying common properties of the interference constraints. It is also shown that systems in which transmitter powers are subject to maximum power limitations share these common properties. These properties permit a general proof of the synchronous and totally asynchronous convergence of the iteration p(t+1)=I(p(t)) to a unique fixed point at which total transmitted power is minimized. >