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.
