3G/UMTS-TDSCDMA

Initial Detection and RACH

i) NodeB is transmitting DwPTS carrying one of the 32 bit pattern defined in 25.223 Table AA.1. (Each bit pattern is made up of 64 bits)

ii) UE detect DwPTS and figure out Code ID by comparing all the 32 bit patterns with the one it recieved. With this UE synchronize it's timing.

iii) UE send UpPCH carrying one of the bit patterns out of 256 bit patterns. (However UE cannot use any of these 256 patterns. With a DwPTS bit pattern, UE can use one of only 8 different bit patterns. The mapping between each DwPTS bit pattern and group of 8 UpPCH bit pattern is defined in 25.223 8.3 Code Allocation.

iv) NodeB detect UpPCH and decode its signature.

v) NodeB send FPACH containing the information in 25.221 Table 8J. (FPACH is similar to AICH in WCDMA)

vi) UE send PRACH with RRC Connection Request.

vii) NodeB send RRC Connection Setup via S-CCPCH.

< Following Table is from 3GPP 25.223 >

< Following Table is from 3GPP 25.223 >

< Following Table is from 25.223 8.3 Code Allocation.>

< Following Table is from 25.221 >