Patent ID: 8717904

Claim:
A method for decoding control information by a User Equipment (UE), the method comprising: monitoring a set of Physical Downlink Control Channel (PDCCH) candidates for control information received from a base station at subframe k, wherein the set of PDCCH candidates to monitor are defined in terms of search spaces, wherein the UE monitors a UE-specific search space, among the search spaces, at each of aggregation levels (L) of 1, 2, 4 and 8 control channel elements (CCEs), wherein the CCE is a resource unit comprising a specific number of resource elements and used for transmission of the control information, wherein the UE-specific search space is given based on a modulus operation using a variable of Y k for the subframe k and a variable C for the subframe k, wherein Y k is defined by: Y k =( A*Y k−1 +B )mod D, wherein the variable C is determined based on the number of CCEs (N CCE ) divided by the aggregation level (L), wherein A, B and D are predetermined constant values predetermined regardless of the aggregation levels (L); and decoding the control information of the PDCCH.