Pre-coded RTS/CTS for synchronous NR-SS
Preceded contention reservation signals for synchronous new radio (NR) shared spectrum (NR-SS) networks are disclosed. A transmitter that uses precoded contention reservation signals may be configured either to skip or use the training phase for determining rank parameters. The transmitter participates in contention resolution with its receiver by transmitting the precoded contention reservation signals precoded with tentative rank parameters. After contention interval, receiver sends feedback to the transmitter identifying proposed rank parameters based on the strongest precoded contention signals of any neighboring nodes that also won access to the channel. When configured to skip the training phase, the transmitter sets the rank parameters according to the proposed rank parameters. Otherwise, the transmitter participates in the training phase with other winning nodes transmitting signals identifying proposed rank parameters. The receiver then feeds back refined rank parameters to the transmitter based on each of the proposed rank parameters of the training phase.
1. A method of wireless communication, comprising:
participating, by a data transmitter, in a contention resolution process during a contention interval with a data receiver for access to a shared communication channel, wherein the data transmitter transmits a precoded contention reservation signal precoded with tentative rank parameters, and wherein the tentative rank parameters rank parameters include a tentative rank indicator and tentative transmission beamforming parameters;
receiving, by the data transmitter, post-contention feedback from the data receiver after the contention interval, wherein the post-contention feedback includes post-contention rank parameters based on one or more sets of precoded contention reservation signals detected above a threshold energy level during the contention interval from one or more nodes that won access to the shared communication channel;
setting, by the data transmitter, data transmission rank parameters according to feedback received from the data receiver; and
transmitting, by the data transmitter, data to the data receiver using the data transmission rank parameters.
2. The method of claim 1 , further including:
receiving, by the data transmitter, a transmission configuration signal, wherein the transmission configuration signal indicates one of: a training phase configuration or a no training phase configuration; and
in response to the transmission configuration signal indicating the training phase configuration:
participating, by the data transmitter, in a training phase after the contention interval, wherein each transmitter that won access to the shared communication channel transmits training phase signals identifying proposed rank parameters; and
receiving, by the data transmitter, refined feedback from the data receiver, wherein the refined feedback identifies refined rank parameters based on the proposed rank parameters received during the training phase, wherein the feedback used to set the data transmission rank parameters is the refined feedback with the refined rank parameters.
3. The method of claim 2 , wherein, in response to the transmission configuration signal indicating the no training phase configuration, the feedback used to set the data transmission rank parameters is the post-contention feedback with the post-contention rank parameters.
4. The method of claim 2 ,
wherein the transmission configuration sign& indicating the training phase configuration is associated with a receiving probability of the precoded contention reservation signals at the data receiver being below a threshold value, and
wherein the transmission configuration signal indicating the no training phase configuration is associated with the receiving probability exceeding the threshold value.
5. The method of claim 1 , further including:
setting, by the data transmitter, the tentative rank parameters to a most-recently used rank parameters of a previous transmission opportunity of the data transmitter.
6. The method of claim 1 , wherein the tentative rank indicator comprises a tentative pilot rank.
7. A method of wireless communication, comprising:
participating, by a data receiver, in a contention resolution process during a contention interval with a data transmitter contending for access to a shared communication channel, wherein the data receiver receives a precoded contention reservation signal precoded with tentative rank parameters from the data transmitter, and wherein the tentative rank parameters rank parameters include a tentative rank indicator and tentative transmission beamforming parameters;
detecting, by the data receiver, one or more sets of precoded contention reservation signals detected above a threshold energy level during the contention interval from one or more nodes contending for access to the shared communication channel;
transmitting, by the data receiver, post-contention feedback after the contention interval, wherein the post-contention feedback includes post-contention rank parameters based on one or more of the one or more sets of precoded contention reservation signals from one or more nodes that won access to the shared communication channel; and
receiving, at the data receiver, data from the data transmitter transmitted according to data transmission rank parameters based on feedback transmitted by the data receiver.
8. The method of claim 7 , further including:
receiving, by the data receiver, a transmission configuration signal, wherein the transmission configuration signal indicates one of: a training phase configuration or a no training phase configuration; and
in response to the transmission configuration signal indicating the training phase configuration:
participating in a training phase, by the data receiver, after the contention interval, wherein each node that won access to the shared communication channel transmits training phase signals identifying proposed rank parameters; and
transmitting, by the data receiver, refined feedback that identifies refined rank parameters based on the proposed rank parameters received during the training phase, wherein the data transmission rank parameters are further based on the refined rank parameters of the refined feedback.
9. The method of claim 8 , further including:
refraining, by the data receiver, from participating in the training phase and from transmitting the refined feedback in response to the transmission configuration signal indicates the no training phase configuration, wherein the data transmission rank parameters are based on the post-contention rank parameters of the post-contention feedback.
10. The method of claim 8 ,
wherein the transmission configuration signal indicating the training phase configuration is associated with a receiving probability of the precoded contention reservation signals at the data receiver being below a threshold value, and
wherein the transmission configuration signal indicating the no training phase configuration is associated with the receiving probability exceeding the threshold value.
11. The method of claim 7 , wherein the tentative rank indicator comprises a tentative pilot rank.
12. An apparatus configured for wireless communication, the apparatus comprising:
at least one processor; and
a memory coupled to the at least one processor,
wherein the at least one processor is configured:
to participate, by a data transmitter, in a contention resolution process during a contention interval with a data receiver for access to a shared communication channel, wherein the data transmitter transmits a precoded contention reservation signal precoded with tentative rank parameters, and wherein the tentative rank parameters rank parameters include a tentative rank indicator and tentative transmission beamforming parameters;
to receive, by the data transmitter, post contention feedback from the data receiver after the contention interval, wherein the post-contention feedback includes post-contention rank parameters based on one or more sets of precoded contention reservation signals detected above a threshold energy level during the contention interval from one or more nodes that won access to the shared communication channel;
to set, by the data transmitter, data transmission rank parameters according to feedback received from the data receiver; and
to transmit, by the data transmitter, data to the data receiver using the data transmission rank parameters.
13. The apparatus of claim 12 , further including configuration of the at least one processor:
to receive, by the data transmitter, a transmission configuration signal, wherein the transmission configuration signal indicates one of: a training phase configuration or a no training phase configuration; and
executable in response to the transmission configuration signal indicating the training phase configuration:
to participate, by the data transmitter, in a training phase after the contention interval, wherein each transmitter that won access to the shared communication channel transmits training phase signals identifying proposed rank parameters; and
to receive, by the data transmitter, refined feedback from the data receiver, wherein the refined feedback identifies refined rank parameters based on the proposed rank parameters received during the training phase, wherein the feedback used to set the data transmission rank parameters is the refined feedback with the refilled rank parameters.
14. The apparatus of claim 13 , wherein, in response to the transmission configuration signal indicating the no training phase configuration, the feedback used to set the data transmission rank parameters is the post-contention feedback with the post-contention rank parameters.
15. The apparatus of claim 13 ,
wherein the transmission configuration signal indicating the training phase configuration is associated with a receiving probability of the precoded contention reservation signals at the data receiver being below a threshold value, and
wherein the transmission configuration signal indicating the no training phase configuration is associated with the receiving probability exceeding the threshold value.
16. The apparatus of claim 12 , further including configuration of the at least one processor to set, by the data transmitter, the tentative rank parameters to a most-recently used rank parameters of a previous transmission opportunity of the data transmitter.
17. The apparatus of claim 12 , wherein the post-contention rank parameters and the data transmission rank parameters each include: a corresponding rank indicator and corresponding transmission beamforming parameters.
18. An apparatus configured for wireless communication, the apparatus comprising:
at least one processor; and
a memory coupled to the at least one processor,
wherein the at least one processor is configured:
to participate, by a data receiver, in a contention resolution process during a contention interval with a data transmitter contending for access to a shared communication channel, wherein the data receiver receives a precoded contention reservation signal precoded with tentative rank parameters from the data transmitter and wherein the tentative rank parameters rank parameters include a tentative rank indicator and tentative transmission beamforming parameters;
to detect, by the data receiver, one or more sets of precoded contention reservation signals detected above a threshold energy level during the contention interval from one or more nodes contending for access to the shared communication channel;
to transmit, by the data receiver, post-contention feedback after the contention interval, wherein the post-contention feedback includes post-contention rank parameters based on one or more of the one or more sets of precoded contention reservation signals from one or more nodes that won access to the shared communication channel; and
to receive, at the data receiver, data from the data transmitter transmitted according to data transmission rank parameters based on feedback transmitted by the data receiver.
19. The apparatus of claim 18 , further including configuration of the at least one processor to receive, by the data receiver, a transmission configuration signal, wherein the transmission configuration signal indicates one of: a training phase configuration or a no training phase configuration; and
executable in response to the transmission configuration signal indicating the training phase configuration:
to participate in a training phase, by the data receiver, after the contention interval, wherein each node that won access to the shared communication channel transmits training phase signals identifying proposed rank parameters; and
to transmit, by the data receiver, refined feedback that identifies refined rank parameters based on the proposed rank parameters received during the training phase, wherein the data transmission rank parameters are further based on the refined rank parameters of the refined feedback.
20. The apparatus of claim 19 , further including configuration of the at least one processor to refrain, by the data receiver, from executing the configuration to participate in the training phase and from executing the configuration to transmit the refined feedback in response to the transmission configuration signal indicates the no training phase configuration, wherein the data transmission rank parameters are based on the post-contention rank parameters of the post-contention feedback.
21. The apparatus of claim 19 ,
wherein the transmission configuration signal indicating the training phase configuration is associated with a receiving probability of the precoded contention reservation signals at the data receiver being below a threshold value, and
wherein the transmission configuration signal indicating the no training phase configuration is associated with the receiving probability exceeding the threshold value.
22. The apparatus of claim 18 , wherein the post-contention rank parameters and the data transmission rank parameters each include: a corresponding rank indicator and corresponding transmission beamforming parameters.