Fast power control for GSM HBS using training sequences

We investigate the usage of fast power control (PC) in Global System for Mobile Communications (GSM) based home base station (HBS) system to alleviate Rayleigh fading for slow moving mobile stations (MS). Low-speed MSs suffer from Rayleigh fading most due to the long periods they spend in the fading dips. Especially, if the system does not employ other techniques to combat Rayleigh fading, such as frequency hopping (FH), the negative effects of the fading are serious. To implement the signalling for fast PC, we propose the usage of training sequences to transfer the power control information over the GSM radio interface. The benefits of this method are various: the transfer of the PC commands will be fast, reliable and the pay load of the frame is not wasted. The magnitude of the improvement was assessed by simulating the link using the COSSAP simulating tool. The conclusion was that the fast PC will increase the link capacity and partly compensates the lack of frequency hopping