Discrete fourier transform pre-coded physical downlink control channel with code domain multiplexing

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

• receiving first configuration information indicating a control channel element (CCE) size, a spreading factor, and an indication of code domain multiplexing (CDM);
• determining second configuration information based on at least the received first configuration information, wherein the second configuration information comprises a resource group (RG) size and a correspondence between the RG size for a CDM RG set and one or more orthogonal cover codes (OCCs);
• determining a CDM RG set allocation pattern across one or more discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) symbols and frequency resource groups (FRGs) based on the determined second configuration information;
• receiving a PDCCH transmission;
• performing an inverse discrete Fourier transform (IDFT), based on the CDM RG set allocation pattern, on a plurality of FRGs and DFT-s-OFDM symbols associated with the PDCCH transmission;
• de-spreading a set of RGs corresponding to the PDCCH transmission based on the correspondence of RGs per CDM RG set to one or more OCCs;
• and
• decoding a downlink control information (DCI) in the PDCCH transmission based on the de-spread set of RGs.

A method performed by a base station, the method comprising:

• sending first configuration information indicating a control channel element (CCE) size, a spreading factor, and an indication of code domain multiplexing (CDM), wherein the first configuration information is configured so that;
• second configuration information can be determined based on the first configuration information, wherein the second configuration information comprises a resource group (RG) size and a correspondence between the RG size for a CDM RG set and one or more orthogonal cover codes (OCCs);
• determining a CDM RG set allocation pattern across one or more discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) symbols and frequency resource groups (FRGs);
• performing discrete Fourier transform (DFT) precoding, based on the CDM RG set allocation pattern, on a plurality of FRGs and the OFDM symbols associated with a PDCCH transmission based on the CDM RG set allocation pattern, and spreading a set of RG corresponding to the PDCCH transmission based on the correspondence of RGs per CDM RG set to one or more OCCs;
• sending the PDCCH transmission, wherein the PDCCH transmission comprises a downlink control information (DCI).