Downlink control signaling

A wireless transmit/receive unit (WTRU) comprising:

• a memory;
• and
• a processor configured to:
• decode a first downlink control information (DCI) via a first downlink control channel of a first serving cell, wherein the first DCI comprises scheduling information for a first physical downlink shared channel (PDSCH) transmission;
• decode a second DCI via a second downlink control channel of a second serving cell, wherein the second DCI comprises scheduling information for a second PDSCH transmission;
• determine that the first PDSCH transmission is to be received via a third serving cell based on the first DCI indicating a first value for a carrier indicator field (CIF) and based on the first DCI being received via the first serving cell;
• determine that the second PDSCH transmission is to be received via a fourth serving cell based on the second DCI indicating the first value for a carrier indicator field and based on the second DCI being received via the second serving cell;
• receive the first PDSCH transmission via the third serving cell in accordance with the first DCI;
• and
• receive the second PDSCH transmission via the fourth serving cell in accordance with the second DCI.

A wireless transmit/receive unit (WTRU) comprising:

• a memory;
• and
• a processor configured to:
• decode a first downlink control information (DCI) via a first downlink control channel of a first scheduling serving cell, wherein the first DCI comprises scheduling information for a first physical downlink shared channel (PDSCH) transmission received by the WTRU via a first scheduled serving cell;
• decode a second DCI via a second downlink control channel of a second scheduling serving cell, wherein the second DCI comprises scheduling information for a second PDSCH transmission received by the WTRU via a second scheduled serving cell;
• receive the first PDSCH transmission via the first scheduled serving cell in accordance with the first DCI, wherein the first scheduled serving cell is determining based on a first group identity contained in the first DCI;
• and
• receive the second PDSCH transmission via the second scheduled serving cell in accordance with the second DCI, wherein the second scheduled serving cell is determining based on a second group identity contained in the second DCI.

A wireless transmit/receive unit (WTRU) comprising:

• a memory;
• and
• a processor configured to:
• decode a first downlink control information (DCI) via a first downlink control channel of a first scheduling serving cell, wherein the first DCI comprises scheduling information for a first physical downlink shared channel (PDSCH) transmission received by the WTRU via a first scheduled serving cell;
• decode a second DCI via the first downlink control channel of the first scheduling serving cell, wherein the second DCI comprises scheduling information for a second PDSCH transmission received by the WTRU via a second scheduled serving cell;
• receive the first PDSCH transmission via the first scheduled serving cell in accordance with the first DCI, wherein the first scheduled serving cell is determining based on a first group identity contained in the first DCI;
• and
• receive the second PDSCH transmission via the second scheduled serving cell in accordance with the second DCI, wherein the second scheduled serving cell is determining based on a second group identity contained in the second DCI.

A method performed by a wireless transmit/receive unit (WTRU), the method comprising:

• the WTRU decoding first downlink control information (DCI) via a downlink control channel of a first serving cell, wherein the first DCI comprises scheduling information for a first physical downlink shared channel (PDSCH) transmission received by the WTRU via the first serving cell;
• the WTRU receiving the first PDSCH transmission via the first serving cell in accordance with the first DCI, the first PDSCH transmission comprising a second DCI, wherein the second DCI comprises scheduling information for a second physical downlink shared channel transmission (PDSCH) transmission received by the WTRU via a second serving cell;
• and
• the WTRU receiving the second PDSCH transmission via the second serving cell in accordance with the second DCI.

A method performed by a wireless transmit/receive unit (WTRU), the method comprising:

• the WTRU decoding a downlink control information (DCI) via a downlink control channel of a first serving cell, wherein the DCI comprises scheduling information for a first PDSCH transmission associated with a first serving cell and a second PDSCH transmission associated with a second serving cell;
• the WTRU receiving the first PDSCH transmission via the first serving cell in accordance with the DCI;
• and
• the WTRU receiving the second PDSCH transmission via the second serving cell in accordance with the DCI.

A method performed by a wireless transmit/receive unit (WTRU), the method comprising:

• the WTRU decoding a first downlink control information (DCI) via a downlink control channel of a first serving cell, wherein the first DCI comprises scheduling information for the first physical downlink shared channel (PDSCH) transmission received by the WTRU via a first serving cell;
• the WTRU decoding a second DCI via the downlink control channel of the first serving cell, wherein
• the WTRU receiving the first PDSCH transmission via the first serving cell in accordance with the first DCI, wherein the first DCI is associated with a second DCI, wherein the second DCI comprises scheduling information for a second physical downlink shared channel (PDSCH) transmission received by the WTRU via a second serving cell;
• and
• the WTRU receiving the second PDSCH transmission via the second serving cell in accordance with the second DCI.

A method performed by a wireless transmit/receive unit (WTRU), the method comprising:

• the WTRU receiving first downlink control channel transmission (DCI);
• the WTRU determining a plurality of cyclic redundancy check (CRC) parity bits for a first candidate downlink control information (DCI) from the first downlink control channel transmission;
• the WTRU attempting descrambling the plurality of CRC parity bits for the first candidate DCI using a radio network temporary identifier (RNTI) of the WTRU and a valid potential value for at least one field included in the first candidate DCI;
• and
• the WTRU determining that the first candidate DCI is valid and applicable to the WTRU based on successfully descrambling the plurality of CRC parity bits for the first candidate DCI using the RNTI of the WTRU and the valid potential value for the at least one field included in the first candidate DCI.

A method performed by a wireless transmit/receive unit (WTRU), the method comprising:

• the WTRU decoding first downlink control information (DCI) via a downlink control channel in a first transmission time interval (TTI), wherein the first DCI comprises scheduling information for a first physical downlink shared channel (PDSCH) transmission for the WTRU sent in the first TTI;
• the WTRU determining a decoding assumption to use when attempting to decode a second DCI via the downlink control channel based on a property of the first DCI, wherein the second DCI comprises scheduling information for a second PDSCH transmission for the WTRU sent in a second TTI;
• the WTRU receiving the second DCI;
• the WTRU receiving the first PDSCH transmission in the first TTI in accordance with the first DCI;
• and
• the WTRU receiving the second PDSCH transmission in the second TTI in accordance with the first DCI.

A method performed by a wireless transmit/receive unit (WTRU) for overhead reduction, the method comprising:

• the WTRU receiving downlink control information (DCI) via a downlink control channel of in a first transmission time interval (TTI), wherein the DCI comprises scheduling information for one or more physical downlink shared channel (PDSCH) transmissions received by the WTRU via a plurality TTIs;
• the WTRU determining which TTIs correspond to the plurality of TTIs according to a group identity contained in the DCI;
• and
• the WTRU receiving the one or more PDSCH transmissions during the plurality of TTIs in accordance with the DCI.

A wireless transmit/receive unit (WTRU) comprising:

• a memory;
• and
• a processor configured to:
• receive first downlink control channel transmission (DCI);
• determine a plurality of cyclic redundancy check (CRC) parity bits for a first candidate downlink control information (DCI) from the first downlink control channel transmission;
• attempt descrambling the plurality of CRC parity bits for the first candidate DCI using a radio network temporary identifier (RNTI) of the WTRU and a valid potential value for at least one field included in the first candidate DCI;
• and
• determine that the first candidate DCI is valid and applicable to the WTRU based on successfully descrambling the plurality of CRC parity bits for the first candidate DCI using the RNTI of the WTRU and the valid potential value for the at least one field included in the first candidate DCI.