BAND OCCUPANCY TECHNIQUES FOR TRANSMISSIONS IN UNLICENSED SPECTRUM

• US 20160135172A1
• Filed: 11/05/2015
• Published: 05/12/2016
• Est. Priority Date: 11/06/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: SUN, Jing, LUO, Tao, SUKHAVASI, Ravi Teja, WEI, Yongbin, MALLADI, Durga Prasad
• Granted Patent: US 10,129,857 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 43/16 Threshold monitoring
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02

Abstract

A method and apparatus for uplink transmission by a user equipment (UE) includes receiving a first assignment for one or more beacon signals. The first assignment includes a first resource assignment and a first interlace assignment. The UE may determine that a size of a payload of an uplink transmission is less than a threshold. The UE may transmit the one or more beacon signals according to the first assignment in response to the determination. The one or more beacon signals increase bandwidth occupancy by the UE over a contention-based spectrum. Additionally, the UE may receive a second assignment for the payload of the uplink transmission. The second assignment includes a second resource assignment and a second interlace assignment. The UE may transmit the payload of the uplink transmission according to the second resource assignment on the second interlace assignment.

Claims

1. A method for uplink transmission by a user equipment (UE), comprising:

receiving a first assignment for one or more beacon signals, the first assignment including a first interlace assignment in a contention-based spectrum;

determining that a size of an uplink grant for a payload of an uplink transmission is less than a threshold; and

transmitting the one or more beacon signals according to the first assignment in response to determining that the size of the uplink grant for the payload of the uplink transmission is less than the threshold, wherein the one or more beacon signals increase bandwidth occupancy by the UE over the contention-based spectrum.

2. The method of claim 1, further comprising:

receiving the uplink grant for the payload of the uplink transmission, wherein the uplink grant includes a resource assignment and a second interlace assignment in the contention-based spectrum; and

transmitting the payload of the uplink transmission according to the resource assignment on the second interlace assignment.

3. The method of claim 2, wherein the first interlace assignment and the second interlace assignment assign a common interlace, and wherein transmitting the one or more beacon signals includes transmitting the one or more beacon signals on resources of the common interlace that are different from the resource assignment used to transmit the payload in the uplink transmission.

4. The method of claim 2, wherein the first interlace assignment is different from the second interlace assignment.

5. The method of claim 1, wherein determining that the size of the uplink grant for the payload of the uplink transmission is less than the threshold includes determining that the payload of the uplink transmission includes a physical uplink control channel (PUCCH) payload, a physical uplink shared channel (PUSCH) payload, or both and determining that a total payload is less than the threshold.

6. The method of claim 5, wherein determining that the size of the uplink grant for the payload of the uplink transmission is less than the threshold includes determining that the payload is an empty payload associated with an empty subframe.

7. The method of claim 2, wherein transmitting the payload includes transmitting at least one PUSCH payload on the second interlace assignment and at least one PUCCH payload according to the first interlace assignment, and wherein transmitting the one or more beacon signals includes transmitting the one or more beacon signals on resource blocks associated with the first interlace assignment that are unoccupied by the at least one PUCCH payload.

8. The method of claim 1, wherein the first interlace assignment is shared with uplink transmissions of at least one additional UE to form a single frequency network (SFN).

9. The method of claim 1, wherein the one or more beacon signals transmitted according to the first assignment provides a bandwidth occupancy percentage that meets or exceeds a bandwidth occupancy level.

10. The method of claim 1, further comprising:

controlling a transmit power used to transmit each of the one or more beacon signals separately from a transmit power used to transmit the payload.

11. The method of claim 2, wherein the second assignment is for a first subframe, the method further comprising:

receiving a second grant for another payload of a second uplink transmission on a second subframe; and

transmitting the one or more beacon signals in an empty subframe between the first subframe and the second subframe.

12. The method of claim 2, wherein the resource assignment includes an assignment of resource blocks or an assignment of orthogonal frequency division multiplexing (OFDM) symbols within a subframe.

13. The method of claim 12, wherein:

the resource assignment assigns resources after a first resource block or a first OFDM symbol within the subframe; and

transmitting the one or more beacon signals includes transmitting the one or more beacon signals in the first resource block or the first OFDM symbol and in any subsequent resource block or OFDM symbol before the assigned resources.

14. The method of claim 1, wherein each of the one or more beacon signals includes a signal waveform that is known to an access point that receives and processes the one or more beacon signals.

15. A user equipment (UE) for uplink transmission, comprising:

means for receiving a first assignment for one or more beacon signals, the first assignment including a first interlace assignment in a contention-based spectrum;

means for determining that a size of an uplink grant for a payload of an uplink transmission is less than a threshold; and

means for transmitting the one or more beacon signals according to the first assignment in response to determining that the size of the uplink grant for the payload of the uplink transmission is less than the threshold, wherein the one or more beacon signals increase bandwidth occupancy by the UE over the contention-based spectrum.

16. The UE of claim 15,

wherein the means for receiving is further for receiving the uplink grant for the payload of the uplink transmission, wherein the uplink grant includes a resource assignment and a second interlace assignment in the contention-based spectrum;

and

wherein the means for transmitting is further for transmitting the payload of the uplink transmission according to the resource assignment on the second interlace assignment.

20. The UE of claim 16, wherein the processor and the memory are configured to determine that the size of the uplink grant for the payload of the uplink transmission is less than the threshold by determining that the payload of the uplink transmission includes a physical uplink control channel (PUCCH) payload, a physical uplink shared channel (PUSCH) payload, or both and determining that a total payload is less than the threshold.

21. The UE of claim 16, wherein the processor and the memory are configured to determine that the size of the uplink grant for the payload of the uplink transmission is less than the threshold by determining that the payload is an empty payload associated with an empty subframe.

23. The UE of claim 16, wherein the first interlace assignment is shared with uplink transmissions of at least one additional UE to form a single frequency network (SFN).

24. The UE of claim 16, wherein the one or more beacon signals transmitted according to the first assignment provides a bandwidth occupancy percentage that meets or exceeds a bandwidth occupancy level.

25. The UE of claim 16, wherein the processor and the memory are further configured to:

control a transmit power used to transmit each of the one or more beacon signals separately from a transmit power used to transmit the payload.

28. The UE of claim 16, wherein each of the one or more beacon signals includes a signal waveform that is known to an access point that receives and processes the one or more beacon signals.

17. A user equipment (UE) for uplink transmission, comprising:

a transceiver configured to receive signals indicating at least one assignment and to transmit one or more beacon signals;

a memory; and

a processor communicatively coupled to the transceiver and the memory, wherein the processor and the memory are configured to;

receive, via the transceiver, a first assignment for the one or more beacon signals, the first assignment including a first interlace assignment in a contention-based spectrum;

determine that a size of an uplink grant for a payload of an uplink transmission is less than a threshold; and

transmit, via the transceiver, the one or more beacon signals according to the first assignment in response to determining that the size of the uplink grant for the payload of the uplink transmission is less than the threshold, wherein the one or more beacon signals increase bandwidth occupancy by the UE over the contention-based spectrum.

18. The UE of claim 17, wherein the processor and the memory are further configured to:

receive the uplink grant for the payload of the uplink transmission, wherein the uplink grant includes a resource assignment and a second interlace assignment in the contention-based spectrum; and

transmit the payload of the uplink transmission according to the resource assignment on the second interlace assignment.

19. The UE of claim 18, wherein the first interlace assignment and the second interlace assignment assign a common interlace, and the processor and the memory are configured to transmit the one or more beacon signals on a resources of the common interlace that are different from the resource assignment used to transmit the payload in the uplink transmission.

22. The UE of claim 17, wherein the processor and the memory are configured to transmit at least one PUSCH payload on the second interlace assignment and at least one PUCCH payload according to the first interlace assignment, and wherein the one or more beacon signals occupy resource blocks associated with the first interlace assignment that are unoccupied by the at least one PUCCH payload.

26. The UE of claim 17, wherein the second assignment is for a first subframe, wherein the processor and the memory are further configured to:

receive a third assignment for another payload on a second uplink transmission on a second subframe; and

transmit, via the transceiver, the one or more beacon signals in an empty subframe between the first subframe and the second subframe.

27. The UE of claim 17, wherein the resource assignment includes an assignment of resource blocks or an assignment of orthogonal frequency division multiplexing (OFDM) symbols.

29. A computer readable medium storing computer executable code for uplink transmission by a user equipment (UE), comprising:

code for receiving a first assignment for one or more beacon signals, the first assignment including a first interlace assignment in a contention-based spectrum;

code for determining that a size of an uplink grant for a payload of an uplink transmission is less than a threshold; and

code for transmitting the one or more beacon signals according to the first assignment in response to determining that the size of the payload of the uplink transmission is less than the threshold, wherein the one or more beacon signals increase bandwidth occupancy by the UE over the contention-based spectrum.

30. The computer readable medium of claim 29, further comprising:

code for receiving the uplink grant for the payload of the uplink transmission, wherein the uplink grant includes a resource assignment and a second interlace assignment in the contention-based spectrum; and

code for transmitting the payload of the uplink transmission according to the resource assignment on the second interlace assignment.