Patent ID: 6980807
Filing Date: 2005-12-27
Classification: H04B

Abstract:
1. A path timing detecting method in a mobile communications system, in which when a plurality of mobile stations access a base station using a common channel at arbitrary timings, each mobile station transmits a preamble for notifying the base station of an occurrence of a message before actually transmitting the message, the base station transmits, in response to reception of the preamble, a transmission control signal authorizing the mobile station to transmit the message, and the mobile station that receives the transmission control signal starts transmitting the message, said path timing detecting method comprising: a step of identifying an effective path timing range using the preamble received by base station; and a step of detecting effective path timings in the identified path timing range using the message transmitted from the mobile station, wherein the step of identifying the effective path timing range determines the effective path timing range as ranging from a start point to an end point, the start point being placed at a timing previous to an earliest one of the path timings detected from the preamble received by the base station by a first time period, and the end point being placed at a timing later than a latest one of the path timings by a second time period.