Control channel for new radio
Systems, methods, and instrumentalities are described herein that may be used to determine one or more control channel operational parameters associated with transmitting first uplink control information (UCI) and second UCI in a same control channel. The parameters may include respective repetition factors and/or spreading factors associated with the first UCI and the second UCI. The parameters may be determined based on respective characteristics of the first UCI and the second UCI. These characteristics may include reliability requirements, usage scenarios, and/or the like. Self-contained subframes may be employed to transmit data and/or control information. The control information may be transmitted using different numerologies than the data.
1. A method implemented in a wireless transmit receive unit (WTRU), the method comprising:
determining a first repetition factor for transmitting first uplink control information (UCI) in an uplink control channel transmission, based on a first characteristic associated with the first UCI;
determining a second repetition factor for transmitting second UCI in the uplink control channel transmission, based on a second characteristic associated with the second UCI, wherein the second characteristic is different from the first characteristic, wherein the second repetition factor is different from the first repetition factor, and wherein the first UCI and the second UCI are a same type of control information;
transmitting the first UCI using the first repetition factor in the uplink control channel transmission; and
transmitting the second UCI using the second repetition factor in the uplink control channel transmission.
2. The method of claim 1 , wherein the first characteristic includes information indicating any of: a first reliability requirement, a first latency requirement, or a first payload size associated with the first UCI, and
wherein the second characteristic includes information indicating any of: a second reliability requirement, a second latency requirement, or a second payload size associated with the second UCI.
3. The method of claim 1 , wherein the first characteristic includes information indicating a first usage scenario associated with the first UCI,
wherein the second characteristic includes information indicating a second usage scenario associated with the second UCI, and
wherein each of the first usage scenario and the second usage scenario is associated with one of: Ultra-Reliable and Low-Latency Communications (UR-LLC), Enhanced Mobile Broadband (eMBB), or Massive Machine-Type Communications (mMTC).
4. The method of claim 3 , wherein the first usage scenario is associated with a higher reliability requirement than the second usage scenario, and wherein the first repetition factor is greater than the second repetition factor.
5. The method of claim 3 , wherein the first usage scenario is associated with UR-LLC and the second usage scenario is associated with any of eMBB or mMTC.
6. The method of claim 1 , wherein the first characteristic includes information indicating a first beamforming mode used to precode the first UCI, and wherein the second characteristic includes information indicating a second beamforming mode used to precode the second UCI.
7. The method of claim 1 , further comprising:
determining, based on the first characteristic, a first spreading factor for transmitting the first UCI in the uplink control channel transmission;
determining, based on the second characteristic, a second spreading factor for transmitting the second UCI in the uplink control channel transmission, wherein the second spreading factor is different from the first spreading factor;
transmitting the first UCI in the uplink control channel transmission using the first spreading factor; and
transmitting the second UCI in the uplink control channel transmission using the second spreading factor.
8. The method of claim 1 , wherein the same type of control information is a hybrid automatic repeat request (HARQ) positive acknowledgment (ACK) or negative ACK (NACK).
9. The method of claim 1 , further comprising:
multiplexing at least a part of the first UCI, at least a part of the second UCI, and a reference signal in an orthogonal frequency-division multiplexing (OFDM) symbol,
wherein the OFDM symbol comprises a plurality of resource elements,
wherein the reference signal is mapped to a first subset of the plurality of resource elements, the part of the first UCI is mapped to a second subset of the plurality of resource elements, and the part of the second UCI is mapped to a third subset of the plurality of resource elements, and
wherein the second subset of the plurality of resource elements is closer to the first subset of the plurality of resource elements than the third subset of the plurality of resource elements.
10. A wireless transmit receive unit (WTRU), comprising:
a processor configured to:
determine a first repetition factor for transmitting first uplink control information (UCI) in an uplink control channel transmission, based on a first characteristic associated with the first UCI; and
determine a second repetition factor for transmitting second UCI in the uplink control channel transmission, based on a second characteristic associated with the second UCI, wherein the second characteristic is different from the first characteristic, wherein the second repetition factor is different from the first repetition factor, and wherein the first UCI and the second UCI are a same type of control information; and
a transceiver configured to:
transmit the first UCI using the first repetition factor in the uplink control channel transmission; and
transmit the second UCI using the second repetition factor in the uplink control channel transmission.
11. The WTRU of claim 10 , wherein the first characteristic includes information indicating any of: a first reliability requirement, a first latency requirement, or a first payload size associated with the first UCI, and
wherein the second characteristic includes information indicating any of: a second reliability requirement, a second latency requirement, or a second payload size associated with the second UCI.
12. The WTRU of claim 10 , wherein the first characteristic includes information indicating a first usage scenario associated with the first UCI,
wherein the second characteristic includes information indicating a second usage scenario associated with the second UCI, and
wherein each of the first usage scenario and the second usage scenario is associated with one of: Ultra-Reliable and Low-Latency Communications (UR-LLC), Enhanced Mobile Broadband (eMBB), or Massive Machine-Type Communications (mMTC).
13. The WTRU of claim 12 , wherein the first usage scenario is associated with a higher reliability requirement than the second usage scenario, and wherein the first repetition factor is greater than the second repetition factor.
14. The WTRU of claim 12 , wherein the processor is further configured to multiplex at least a part of the first UCI, at least a part of the second UCI, and a reference signal in an orthogonal frequency-division multiplexing (OFDM) symbol,
wherein the OFDM symbol comprises a plurality of resource elements,
wherein the reference signal is mapped to a first subset of the plurality of resource elements, the part of the first UCI is mapped to a second subset of the plurality of resource elements, and the part of the second UCI is mapped to a third subset of the plurality of resource elements, and
wherein the second subset of the plurality of resource elements is closer to the first subset of the plurality of resource elements than the third subset of the plurality of resource elements.
15. The WTRU of claim 10 , wherein the first characteristic includes information indicating a first beamforming mode used to transmit the first UCI, and wherein the second characteristic includes information indicating a second beamforming mode used to transmit the second UCI.
16. The WTRU of claim 10 , wherein the processor is further configured to:
determine, based on the first characteristic, a first spreading factor for transmitting the first UCI in the uplink control channel transmission; and
determine, based on the second characteristic, a second spreading factor for transmitting the second UCI in the uplink control channel transmission, wherein the second spreading factor is different from the first spreading factor; and
wherein the transceiver is further configured to:
transmit the first UCI in the uplink control channel transmission using the first spreading factor; and
transmit the second UCI in the uplink control channel transmission using the second spreading factor.
17. The WTRU of claim 10 , wherein the same type of control information is a hybrid automatic repeat request (HARQ) positive acknowledgment (ACK) or negative ACK (NACK).