A RANDOM ACCESS METHOD OF TDD SYSTEM

摘要

The present invention discloses a random access method of TDD system, apply to high-speed data transmission system, this method includes: setting three time duration in each control period, respectively time duration T1, time duration T2 and time duration T3, and setting time duration T2 behind time duration T1, setting time duration T3 behind time duration T2, in high-speed data transmission system, all user terminal of transmitting random access request transmits corresponding uplink synchronization code in time duration T1; network side concentrated transmits the respond of random access request; after user terminal receives the respond, transmits random access information in time duration T3 based on corresponding access information inside. This invention realizes random access by concentrated responding access request of user in a length of time duration, the invention effective utilizes resource of downlink control information, and simple, reliable.