Patent ID: 11917640
Assignee: SUN PATENT TRUST
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An integrated circuit comprising:
control circuitry which, in operation, controls
mapping first downlink control information to one of a plurality of first mapping candidates in a common search space in a Physical Downlink Control Channel (PDCCH) region of a subframe, and
mapping second downlink control information to one of second mapping candidates in a user-specific search space in an extended Physical Downlink Control Channel (extended PDCCH) region defined within a data region of the subframe of a single cell,
wherein the first downlink control information is common to a plurality of terminal apparatuses including a first terminal apparatus and a second terminal apparatus, the second downlink control information is dedicated to the first terminal apparatus; and

a transmission circuitry which, in operation, controls of
transmitting to the plurality of terminal apparatuses the mapped first downlink control information and the mapped second downlink control information, and
transmitting search space information over an upper layer, the search space information indicating whether the user-specific search space in the extended PDCCH region within the single cell being searched for the second downlink control information is configured for the first terminal apparatus,

wherein a number of the second mapping candidates included in the user-specific search space in the extended PDCCH region is equal to or greater than a number of the first mapping candidates included in the common search space in the PDCCH region.