Method and system for indicating method used to scramble dedicated reference signals

A method, comprising:

• receiving a downlink transmission grant and a Physical Downlink Shared CHannel (PDSCH) from a base station, the downlink transmission grant using at least one of a cell radio network temporary identifier (C-RNTI) and a semi-persistent scheduling (SPS) C-RNTI,
• wherein, if the downlink transmission grant is acquired using the C-RNTI, and if the downlink transmission grant utilizes a first downlink control information (DCI) format, then determining that transmission of the PDSCH by the base station uses a transmit diversity transmission scheme or a single antenna-port scheme,
• if the downlink transmission grant is acquired using the C-RNTI, and if the downlink transmission grant utilizes a second DCI format, then determining that transmission of the PDSCH by the base station uses a dual-dedicated reference signal (DRS) port transmission scheme or a single-DRS port transmission scheme,
• if the downlink transmission grant is acquired using the SPS C-RNTI, and if the downlink transmission grant utilizes the first DCI format, then determining that transmission of the PDSCH by the base station uses a single-DRS port transmission scheme, and
• if the downlink transmission grant is acquired using the SPS C-RNTI, and if the downlink transmission grant utilizes the second DCI format, then determining that transmission of the PDSCH by the base station uses a dual-DRS port transmission scheme or a single-DRS port transmission scheme.

A base station, comprising:

• a transmit path circuitry configured to scramble cyclic redundancy check (CRC) bits of a downlink control information (DCI) of either a first or a second DCI format using either a cell radio network temporary identifier (C-RNTI) for dynamic scheduling or a semi-persistent scheduling (SPS) C-RNTI for semi-persistent scheduling,
• the transmit path circuitry further configured to transmit the DCI and a Physical Downlink Shared CHannel (PDSCH) scheduled by the DCI to a subscriber station,
• wherein, if the C-RNTI is used to scramble the CRC bits and the DCI is of the first DCI format, then the PDSCH is transmitted using a transmit diversity scheme or a single antenna-port scheme;
• if the C-RNTI is used to scramble the CRC bits and the DCI is of the second DCI format, then the PDSCH is transmitted using a dual-dedicated reference signal (DRS) port transmission scheme or a single-DRS port transmission scheme,
• if the SPS C-RNTI is used to scramble the CRC bits and the DCI is of the first DCI format, then the PDSCH is transmitted using a single-DRS port transmission scheme;
• if the SPS C-RNTI is used to scramble the CRC bits and the DCI is of the second DCI format, then the PDSCH is transmitted using a dual-DRS port transmission scheme or a single-DRS port transmission scheme.

A method, comprising:

• scrambling cyclic redundancy check (CRC) bits of a downlink control information (DCI) of either a first or a second DCI format using either a cell radio network temporary identifier (C-RNTI) for dynamic scheduling or a semi-persistent scheduling (SPS) C-RNTI for semi-persistent scheduling;
• and
• transmitting the DCI and a Physical Downlink Shared CHannel (PDSCH) scheduled by the DCI to a subscriber station,
• wherein, if the C-RNTI is used to scramble the CRC bits and the DCI is of the first DCI format, then the PDSCH is transmitted using a transmit diversity scheme or a single antenna-port scheme;
• if the C-RNTI is used to scramble the CRC bits and the DCI is of the second DCI format, then the PDSCH is transmitted using a dual-dedicated reference signal (DRS) port transmission scheme or a single-DRS port transmission scheme,
• if the SPS C-RNTI is used to scramble the CRC bits and the DCI is of the first DCI format, then the PDSCH is transmitted using a single-DRS port transmission scheme;
• if the SPS C-RNTI is used to scramble the CRC bits and the DCI is of the second DCI format, then the PDSCH is transmitted using a dual-DRS port transmission scheme or a single-DRS port transmission scheme.