- 专利标题: Method and apparatus for controlling reverse link interference rise and power control instability in a wireless system
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申请号: US09413036申请日: 1999-10-06
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公开(公告)号: US06968201B1公开(公告)日: 2005-11-22
- 发明人: Asif D. Gandhi , Lei Song , Mathew Thomas , Stanley Vitebsky
- 申请人: Asif D. Gandhi , Lei Song , Mathew Thomas , Stanley Vitebsky
- 申请人地址: US NJ Murray Hill
- 专利权人: Lucent Technologies, Inc.
- 当前专利权人: Lucent Technologies, Inc.
- 当前专利权人地址: US NJ Murray Hill
- 代理机构: Harness Dickey & Pierce, PLC
- 主分类号: H04B7/005
- IPC分类号: H04B7/005 ; H04B7/26 ; H04Q7/20
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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