Patent ID: 8260356

Claim:
A base station comprising: a transmit path circuitry configured to: scramble cyclic redundancy check (CRC) bits of a downlink control information (DCI) format using a cell radio network temporary identifier (C-RNTI) for dynamic scheduling, and scramble the CRC bits of the DCI format using a semi-persistent scheduling (SPS) C-RNTI for semi-persistent scheduling; if C-RNTI is used to scramble the CRC bits, generate a downlink transmission grant using the DCI format being a fallback format to indicate a transmit diversity scheme or a single-layer beamforming scheme, and transmit the downlink transmission grant in a common or user equipment-specific search space of a control channel (CCE) domain, and generate a downlink transmission grant using the DCI format being a dual-layer beamforming format to indicate a dual-dedicated reference signal (DRS) port transmission scheme or a single-DRS port transmission scheme, and transmit the downlink transmission grant in a user equipment-specific search space of the CCE domain; and if SPS C-RNTI is used to scramble the CRC bits, generate a downlink transmission grant using the DCI format being the fallback format to indicate a single-DRS port transmission scheme, and transmit the downlink transmission grant in a common or user equipment-specific search space of the CCE domain, and generate a downlink transmission grant using the DCI format being the dual-layer beamforming format to indicate a dual-DRS port transmission scheme or a single-DRS port transmission scheme, and transmit the downlink transmission grant in a user equipment-specific search space of the CCE domain.