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Method and apparatus for controlling reverse link interference rise and power control instability in a wireless system
Method and apparatus for controlling reverse link interference rise and power control instability in a wireless system
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机译:在无线系统中控制反向链路干扰上升和功率控制不稳定性的方法和装置
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摘要
A system and a method for reverse link power control in a wireless communications network generates power adjust commands for mobiles being served by a network base station in a centralized manner by considering overall system performance when an increased interference condition is detected. In one implementation, a base station power control processor adopts a modified reverse inner loop power control (RILPC) and/or a reverse outer loop power control (ROLPC) algorithm when an increased interference condition is detected. According to the modified RILPC algorithm, a percentage of power-up adjust commands which would normally be generated when Eb/No measurements for served mobiles do not meet target Eb/No levels are converted to power down-adjust commands, thereby forcing some mobiles to reduce transmit power, at least temporarily, to constrain interference. When the increased interference condition persists, the percentage of power-up adjust commands which are converted to power-down commands may be changed. According to the modified ROLPC algorithm, the power control processor adjusts target Eb/No levels in a centralized manner based on an overall system state so that only a limited number of target Eb/No levels are allowed to increase when frame erasures occur. By preventing a percentage of target Eb/No level increases, at least temporarily, when frame erasures occur, a percentage of power up-adjust commands are avoided. Therefore, a similar effect to that achieved by the modified RILPC is achieved. In accordance with still a further implementation of the present invention, the modified RILPC algorithm may be used in combination with the modified ROLPC algorithm to provide greater resistance to increased interference conditions.
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机译:用于无线通信网络中的反向链路功率控制的系统和方法通过在检测到增加的干扰条件时考虑总体系统性能来生成用于功率集中由网络基站服务的移动台的功率调整命令。在一个实现中,当检测到增加的干扰条件时,基站功率控制处理器采用改进的反向内环功率控制(RILPC)和/或反向外环功率控制(ROLPC)算法。根据修改后的RILPC算法,上电调整命令的百分比通常在被服务移动台的E b Sub> / N o Sub>测量值不满足目标E < Sub> b Sub> / N o Sub>级别被转换为功率降低调整命令,从而迫使某些移动设备至少暂时地降低发射功率以限制干扰。当增加的干扰条件持续存在时,上电调整命令转换为掉电命令的百分比可能会改变。根据修改后的ROLPC算法,功率控制处理器会基于整体系统状态以集中方式调整目标E b Sub> / N o Sub>级别,因此只有有限数量的发生帧擦除时,允许增加目标E b Sub> / N o Sub>级别。通过防止百分比的目标E b Sub> / N o Sub>级别增加,至少暂时地,当发生帧擦除时,可以避免一定百分比的上电调整命令。因此,获得了与改进的RILPC实现的效果相似的效果。根据本发明的又一实施方式,修改后的RILPC算法可以与修改后的ROLPC算法结合使用,以对增加的干扰条件提供更大的抵抗力。
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