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On Power Control with Active Link Quality Protection in Wireless Communication Networks

Transmitter power control in wireless communication networks makes it possible for information carrying signals to reach their intended receivers, while generating minimal interference on other receivers sharing the same channel. This allows for more mobiles to co-exist in the same channel, increasing the capacity of the network through e cient channel reuse. Existing distributed power control algorithms exhibit the problem that, when new users attempt to access the channel, and the desired signal-to-interference ratio (SIR) requirements are no longer achievable, then the SIRs of some already operational (active) links can drop below their required threshold values, causing them to become unreliable. In this paper we present a distributed power control scheme, which maintains the SIRs of operational (active) links above their required lower thresholds at all times (link quality protection), while new users are being admitted; furthermore, when new users cannot be successfully admitted (and thus have to be blocked and rejected), existing ones do not suffer uctuations of their SIRs below their required thresholds values.