UL waveform during RACH procedure and autonomous UL transmission

A user equipment (UE) comprising:

• one or more processor that selects a waveform from one of:
• Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) single-stream transmission waveform, and
• Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM) multi-stream transmission waveform;
• wherein the one or more processor further determines time and frequency resources that correspond to the selected waveform;
• and
• one or more transmitter that sends an uplink (UL) transmission, via one or more antenna, according to the selected waveform and the determined time and frequency resources, wherein the UL transmission is part of a Random Access Channel (RACH) request, wherein the RACH request is one of:
• a 2-step RACH request including a first message and at least one subsequent UL transmission, and wherein a data payload of the first message of the 2-step RACH request includes:
• a first waveform indicator indicating a selected waveform for transmitting the first message of the 2-step RACH request;
• and
• a second waveform indicator, different than the first waveform indicator, indicating a selected waveform for transmitting the at least one subsequent UL transmission of the 2-step RACH request;
• and
• a 4-step RACH request including a third message (msg3), and at least one subsequent UL transmission, and wherein
• the third message (msg3) of the 4-step RACH request includes a waveform indicator indicating a selected waveform for transmitting the at least one subsequent UL transmission of the 4-step RACH request.

A non-transitory computer-readable medium having program code recorded thereon, which when executed on user equipment (UE) causes the UE to perform functions, the program code comprising:

• program code for selecting a waveform to use for Random Access Channel (RACH) requests or autonomous uplink (UL) transmissions;
• program code for receiving time and frequency resources from a base station,
• based on the received time and frequency resources, program code for determining which of the time and frequency resources correspond to a preconfigured waveform, wherein the preconfigured waveform is one of:
• Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) single-stream transmission waveform, and
• Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM) multi-stream transmission waveform;
• and
• program code for sending an UL transmission, via one or more transmitter and one or more antenna, according to the selected waveform and a determined time and frequency resources that correspond thereto, wherein the UL transmission is part of a RACH request, wherein the RACH request is one of:
• a 2-step RACH request including a first message and at least one subsequent UL transmission, and wherein a data payload of the first message of the 2-step RACH request includes:
• a first waveform indicator indicating a selected waveform for transmitting the first message of the 2-step RACH request;
• and
• a second waveform indicator, different than the first waveform indicator, indicating a selected waveform for transmitting the at least one subsequent UL transmission of the 2-step RACH request;
• and
• a 4-step RACH request including a third message (msg3), and at least one subsequent UL transmission, and wherein
• the third message (msg3) of the 4-step RACH request includes a waveform indicator indicating a selected waveform for transmitting the at least one subsequent UL transmission of the 4-step RACH request.

A user equipment (UE) comprising:

• means for selecting a waveform to use for RACH requests or autonomous uplink (UL) transmissions;
• means for receiving time and frequency resources from a base station,
• based on the received time and frequency resources, means for determining which of the time and frequency resources correspond to a preconfigured waveform, wherein the preconfigured waveform is one of:
• Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) single-stream transmission waveform, and
• Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM) multi-stream transmission waveform;
• and
• means for sending an UL transmission, via one or more transmitter and one or more antenna, according to the selected waveform and a determined time and frequency resources that correspond thereto, wherein the UL transmission is part of a RACH request, wherein the RACH request is one of:
• a 2-step RACH request including a first message and at least one subsequent UL transmission, and wherein a data payload of the first message of the 2-step RACH request includes:
• a first waveform indicator indicating a selected waveform for transmitting the first message of the 2-step RACH request;
• and
• a second waveform indicator, different than the first waveform indicator, indicating a selected waveform for transmitting the at least one subsequent UL transmission of the 2-step RACH request;
• and
• a 4-step RACH request including a third message (msg3), and at least one subsequent UL transmission, and wherein
• the third message (msg3) of the 4-step RACH request includes a waveform indicator indicating a selected waveform for transmitting the at least one subsequent UL transmission of the 4-step RACH request.