Patent ID: 6233257
Filing Date: 2001-05-15
Classification: H04J,H04W

Abstract:
A method for compensating for a delay attributed to a round trip distance between a base station and a personal station of a wireless local loop system, said method comprising the steps of:a) said base station transmitting control data to said personal station, said control data transmitted within base station transmit slots, wherein said base station and said personal station are components of a personal handy phone system and utilize a time division multiple access capability having frames that are time division duplexed wherein a single frame is approximately 5 milliseconds and contains eight communication slots;b) said personal station, in an unsynchronized state, receiving control data and synchronizing a personal station receive slot thereto;c) said personal station transmitting a signal, during a subsequent personal station transmit slot, to said base station;d) said base station computing a delay between the time of reception of said signal by said base station and an expected time of reception, said expected time of reception being the start time of a base station receive slot that corresponds to said personal station transmit slot;e) transmitting said delay to said personal station; andf) said personal station using said delay to transmit information in advance of personal station transmit slots to compensate for said round trip distance in subsequent communications between said personal station and said base station, wherein said step f) comprises the step of adding said delay to an existing group delay used by said personal station.