RANDOM ACCESS IN A MOBILE TELECOMMUNICATIONS SYSTEM

摘要

AN UPLINK COMMON PHYSICAL CHANNEL (RANDOM ACCESS CHANNEL) FRAME STRUCTURE IS DISLOSED WITH A SEPATED PREAMBLE AND DATA PORTION. TEH PREAMBLE IS USED BY A BASE STATION TO AMOBILE STATION IS ATTEMPTING A RANDOM ACCESS REQUEST. THE DATA POTION OF THE CHANNEL INCLUDES USER DATA, AND PILOT SYMBOLS THAT PROVIDE ENERGY FOR CHANNEL ESTIMATION DURING OF THE DATA POTION. A GUSRD INTERVAL (TG) IS PREFERABLY INSERTED BETWEEN THE PREAMBLE AND DATA POTION OF THE FRAME, WHICH ENABLES DATA DETECTION TO OCCUR DURING AN IDLE PERIOD. AS SUCH , THE FRAME STRUCTURES FOR BOTH THE COMMON PHYSICAL (RANDOM ACCESS) UPLINK CHANNEL AND DEDICATED PHYSICAL (TRAFFIC) UPLINK CHANNEL ARE COMPATIBLE.