Patent ID: 9603081
Date: 2017-03-21
CPC Classifications: H04J,H04L,H04W

Claim:
1. An initial access method for a user equipment (UE) in a wireless communication system comprising: acquiring, by the UE, information comprising a cell identification (ID) from a synchronous signal; receiving, by the UE, a first Physical Broadcast Channel (PBCH) through a first subframe and performing, by the UE, random access based on a Physical Downlink Control Channel (PDCCH), when the cell ID belongs to a first range of cell IDs; and receiving, by the UE, a second PBCH through a second subframe different from the first subframe and performing, by the UE, random access based on a first Enhanced Physical Downlink Control Channel (EPDCCH), when the cell ID belongs to a second range or a third range of cell IDs; wherein the PDCCH is decoded based on a cell specific reference signal (CRS), wherein the EPDCCH is decoded based on a demodulation reference signal (DMRS), wherein the PDCCH is allocated in a control region of a third subframe, and wherein the EPDCCH is allocated in a fourth subframe and a starting position of the allocated EPDCCH varies depending upon a range to which the cell ID belongs.