Patent ID: 9220090
Filing Date: 2015-12-22
Classification: H04L,H04W

Abstract:
1. A communication apparatus comprising: circuitry, which, in operation: configures at least one of (i) a first search space for localized transmission, which is comprised of a plurality of first control channel elements (CCEs), each first CCE consisting of four enhanced resource element groups (EREGs) in one physical resource block pair (PRB pair), and (ii) a second search space for distributed transmission, which is comprised of a plurality of second CCEs, each second CCE consisting of four EREGs distributed among a plurality of PRB pairs, wherein each of the one or the plurality of PRB pairs is divided into sixteen EREGs; and maps assignment information to at least one of the first search space and the second search space; and a transmitter, which, in operation, transits the assignment information and PRB pair information related to the PRB pairs to a terminal, the PRB pair information being used at the terminal to specify a configuration of at least one of the first search space and the second search space, wherein four EREGs that are provided in one PRB pair, which form a portion of EREGs that correspond to a subset of the plurality of second CCEs, are identical to four EREGs that correspond to one first CCE of a subset of the plurality of first CCEs, and four EREGs that are provided in another PRB pair, which form another portion of the EREGs that correspond to said subset of the plurality of second CCEs, are identical to four EREGs that correspond to another first CCE of said subset of the plurality of first CCEs.