CHANNEL RESERVATION SIGNAL WITH NEW RADIO PDCCH WAVEFORM

• US 20180176946A1
• Filed: 09/19/2017
• Published: 06/21/2018
• Est. Priority Date: 12/16/2016
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: SUN, Jing, KADOUS, Tamer Adel
• Granted Patent: US 10,779,320 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0083 symbol-by-symbol
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 28/26 Resource reservation
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

Techniques for a channel reservation signal design with a new radio (NR) physical downlink control channel waveform are provided. A method for wireless communication includes determining one or more orthogonal frequency division multiplexing (OFDM) symbols to transmit channel reservation signals, and determining a plurality of resources available for transmitting the channel reservation signals during the OFDM symbol(s). The method further includes selecting one set of resources within a plurality of resources to transmit a channel reservation signal, and transmitting the channel reservation signal in the selected set of resources to reserve a portion of spectrum for communication. Another method for wireless communication includes determining OFDM symbol(s) to monitor for channel reservation signals, determining a plurality of resources available for monitoring the channel reservation signals during the OFDM symbol(s), and monitoring for one or more channel reservation signals transmitted in a set of resources within the plurality of resources.

Claims

1. A method for wireless communication by an apparatus, comprising:

determining one or more orthogonal frequency division multiplexing (OFDM) symbols to transmit channel reservation signals;

determining a plurality of resources available for transmitting the channel reservation signals during the one or more OFDM symbols;

selecting one set of resources within the plurality of resources to transmit a channel reservation signal; and

transmitting the channel reservation signal in the selected set of resources to reserve a portion of spectrum for communication.

2. The method of claim 1, wherein:

the plurality of resources for the channel reservation signal transmission use a structure of a downlink control channel; and

the plurality of resources comprise one or more control channel elements (CCEs).

3. The method of claim 1, further comprising:

determining a plurality of decoding candidates available for sending the channel reservation signals, wherein each decoding candidate comprises one or more control channel elements (CCEs); and

selecting one of the decoding candidates to use for sending the channel reservation signal, wherein the selected set of resources comprises the CCEs of the selected decoding candidate.

4. The method of claim 3, wherein selecting the one of the decoding candidates comprises randomly selecting a decoding candidate from the plurality of decoding candidates.

5. The method of claim 3, further comprising:

identifying at least one other decoding candidate used by another device for sending a channel reservation signal;

determining whether the selected decoding candidate collides with the decoding candidate used by the other device; and

selecting another decoding candidate if there is a collision.

6. The method of claim 3, wherein each CCE comprises one or more physical resource blocks (PRBs) and wherein each PRB comprises a demodulation reference signal (DMRS).

7. The method of claim 3, wherein determining the one or more OFDM symbols comprises selecting a same set of OFDM symbols chosen by at least another device for a channel reservation signal transmission in order to align the channel reservation signal transmissions.

8. The method of claim 7, wherein the selected decoding candidate is different from a decoding candidate used for the channel reservation signal transmission of the other device.

9. The method of claim 1, wherein the channel reservation signal comprises a first channel reservation signal that indicates the communication is for sending a transmission, or a second channel reservation signal that indicates the communication is for receiving a transmission.

10. The method of claim 9, wherein the first channel reservation signal comprises power control information regarding the communication.

11. The method of claim 9, wherein the second channel reservation signal comprises power control information of the second channel reservation signal.

12. The method of claim 9, wherein:

the first channel reservation signal is transmitted at a same time as at least one other channel reservation signal from another device; and

the other channel reservation signal indicates a communication of the other device is for sending a transmission.

13. The method of claim 12, wherein the set of resources used for the first channel reservation signal does not overlap with a set of resources, within the plurality of resources, used for the other channel reservation signal.

14. The method of claim 9, wherein:

the second channel reservation signal is transmitted at a same time as at least one other channel reservation signal from another device; and

the other channel reservation signal indicates a communication of the other device is for receiving a transmission.

15. The method of claim 14, wherein the set of resources used for the second channel reservation signal does not overlap with a set of resources, within the plurality of resources, used for the other channel reservation signal.

16. The method of claim 1, further comprising:

transmitting a grant message to one or more user equipments (UEs) before transmitting the channel reservation signal, wherein the grant message comprises a grant for at least one of uplink or downlink communications and indicates at least one of a time for each of the one or more UEs to transmit a channel reservation signal, or a time for each of the one or more UEs to monitor for a channel reservation signal.

17. The method of claim 1, wherein the apparatus is a base station (BS) or a user equipment (UE).

18. A method for wireless communication by an apparatus, comprising:

determining one or more orthogonal frequency division multiplexing (OFDM) symbols to monitor for channel reservation signals;

determining a plurality of resources available for monitoring the channel reservation signals during the one or more OFDM symbols; and

monitoring for one or more channel reservation signals transmitted in a set of resources within the plurality of resources.

19. The method of claim 18, wherein at least one of the channel reservation signals indicates that a communication during a portion of a spectrum is for sending a transmission.

20. The method of claim 18, wherein at least one of the channel reservation signals indicates that a communication during a portion of a spectrum is for receiving a transmission.

21. The method of claim 18, wherein monitoring for the one or more channel reservation signals comprises:

determining a plurality of decoding candidates in the set of resources available for sending the one or more channel reservation signals, wherein each channel reservation signal uses one of the plurality of decoding candidates; and

performing a blind decoding procedure across the plurality of decoding candidates for the one or more channel reservation signals.

22. The method of claim 21, wherein determining the one or more OFDM symbols comprises selecting a same set of OFDM symbols chosen by at least another device for monitoring for a channel reservation signal in order to align monitoring of the channel reservation signals.

23. The method of claim 21, wherein each decoding candidate comprises one or more control channel elements (CCEs), wherein each CCE comprises one or more physical resource blocks (PRBs), and wherein each PRB comprises a demodulation reference signal (DMRS).

24. The method of claim 23, further comprising:

processing one of the decoding candidates used for one of the channel reservation signals based on the DMRSs.

25. The method of claim 18, wherein the plurality of resources available for monitoring for the channel reservation signal use a structure of a downlink control channel.

26. The method of claim 18, further comprising:

monitoring for a grant message in the plurality of resources; and

determining, based on a schedule in the grant message, a time for monitoring one or more of the plurality of channel reservation signals.

27. The method of claim 18, wherein the apparatus comprises a base station (BS) or a user equipment (UE).

28. An apparatus for wireless communication, comprising:

means for determining one or more orthogonal frequency division multiplexing (OFDM) symbols to transmit channel reservation signals;

means for determining a plurality of resources available for transmitting the channel reservation signals during the one or more OFDM symbols;

means for selecting one set of resources within the plurality of resources to transmit a channel reservation signal; and

means for transmitting the channel reservation signal in the selected set of resources to reserve a portion of spectrum for communication.

29. An apparatus for wireless communication, comprising:

means for determining one or more orthogonal frequency division multiplexing (OFDM) symbols to monitor for channel reservation signals;

means for determining a plurality of resources available for monitoring the channel reservation signals during the one or more OFDM symbols; and

means for monitoring for one or more channel reservation signals transmitted in a set of resources within the plurality of resources.