FAST-LOOP RESOURCE RESERVATION PROCEDURE

• US 20190320465A1
• Filed: 04/09/2019
• Published: 10/17/2019
• Est. Priority Date: 04/13/2018
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: WU, Zhibin, ABEDINI, Navid, LI, Junyi, GULATI, Kapil, BAGHEL, Sudhir Kumar
• Granted Patent: US 10,966,252 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/281 taking into account user or data type priority
• CPC Class Codes: H04W 52/383 power control in peer-to-peer links
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 74/0816 with collision avoidance
• CPC Class Codes: H04W 92/18 between terminal devices

Abstract

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may perform a slot reservation procedure to obtain a TxOP for communicating with a second UE. The slot reservation procedure may be performed in an earliest slot in the TxOP in which the first UE has data to send to the second UE. The apparatus may transmit the data to the second UE using at least one slot in the TxOP when the slot reservation procedure is successful. In certain aspects, all remaining slots in the TxOP may be reserved for the first UE when the slot reservation procedure is successful. The apparatus may refrain from performing a subsequent slot reservation procedure in another slot in the TxOP when the slot reservation procedure is unsuccessful unless an end of transmission signal is received during the TxOP.

Claims

1. A method of wireless communication of a first user equipment (UE), comprising:

performing a slot reservation procedure to obtain a transmission opportunity (TxOP) for communicating with a second UE, the TxOP including a plurality of contiguous slots, and the slot reservation procedure being performed in an earliest slot in the TxOP in which the first UE has data to send to the second UE;

transmitting the data to the second UE using at least one slot in the TxOP when the slot reservation procedure is successful, all remaining slots in the TxOP being reserved for the first UE when the slot reservation procedure is successful; and

refraining from performing a subsequent slot reservation procedure in another slot in the TxOP when the slot reservation procedure is unsuccessful unless an end of transmission signal is received during the TxOP.

2. The method of claim 1, wherein the performing the slot reservation procedure for the TxOP comprises:

transmitting a first request-to-send (RTS) signal using a first set of reservation symbols in the earliest slot in the TxOP in which the first UE has the data to transmit to the second UE, the first RTS signal including at least in part a first UE identification (ID) associated with the first UE.

3. The method of claim 2, wherein the performing the slot reservation procedure for the TxOP further comprises:

determining whether a second RTS signal is transmitted by a third UE using the first set of reservation symbols in the earliest slot of the TxOP in which the first UE has the data to transmit to the second UE, the second RTS signal including at least in part a second UE ID associated with the third UE,

wherein the slot reservation procedure is successful when the second RTS signal is not detected during the first set of reservation symbols.

4. The method of claim 3, wherein upon determining that the second RTS signal is transmitted by the third UE using the first set of reservation symbols, the performing the slot reservation procedure for the TxOP further comprises:

determining whether a measured power level associated with the second RTS signal is greater than a threshold level,

wherein the slot reservation procedure is successful when the measured power level associated with the second RTS signal received from the third UE is less than the threshold level.

5. The method of claim 4, wherein upon determining that the measured power level associated with the second RTS signal transmitted by the third UE is greater than or equal to the threshold level, the performing the slot reservation procedure for the TxOP further comprises:

determining whether the first UE ID associated with the first UE has a higher priority than the second UE ID associated with the third UE,

wherein the slot reservation procedure is successful when the first UE ID has the higher priority than the second UE ID, and

wherein the slot reservation procedure is unsuccessful when the first UE ID has a lower priority than the second UE ID.

6. The method of claim 5, wherein when the first UE ID and the second UE ID are associated with a same priority, the slot reservation procedure includes prioritizing a UE having a higher UE ID value.

7. The method of claim 5, wherein the performing the slot reservation procedure for the TxOP further comprises:

transmitting a first clear-to-send (CTS) signal using a second set of reservation symbols in the earliest slot of the TxOP in which the first UE has the data to send to the second UE upon determining that the first UE ID has the lower priority than the second UE ID; and

refraining from sending the first CTS signal to the third UE upon determining that the first UE ID has the higher priority than the second UE ID.

8. The method of claim 7, wherein the performing the slot reservation procedure for the TxOP further comprises:

receiving a second CTS signal in the second set of reservation symbols in the earliest slot of the TxOP in which the first UE has the data to transmit to the second UE when the first UE ID has the higher priority than the second UE ID.

9. The method of claim 8, wherein the data is transmitted using two or more contiguous slots of the plurality of contiguous slots in the TxOP.

10. The method of claim 8, wherein the data is transmitted using two or more non-contiguous slots of the plurality of contiguous slots in the TxOP.

11. The method of claim 3, wherein the first RTS signal indicates in which of the plurality of contiguous slots of the TxOP the data will be transmitted by the first UE, or

wherein the second RTS signal indicates in which of the plurality of contiguous slots of the TxOP second data will be transmitted by the third UE.

12. The method of claim 1, wherein when the slot reservation procedure is successful, the performing the slot reservation procedure for the TxOP further comprises:

transmitting the end of transmission signal using a second set of reservation symbols located subsequent to a final slot in the TxOP in which the first UE transmits the data to the second UE.

13. The method of claim 1, wherein an entire duration of the TxOP is reserved for the first UE when the slot reservation procedure is successful.

14. The method of claim 1, wherein when the slot reservation procedure is unsuccessful, the performing the slot reservation procedure for the TxOP further comprises:

receiving the end of transmission signal using a second set of reservation symbols located subsequent to a final slot in the TxOP in which a third UE sends second data; and

performing the subsequent slot reservation procedure in any remaining slots in the TxOP upon receiving the end of transmission signal.

15. An apparatus for wireless communication of a first user equipment (UE), comprising:

means for performing a slot reservation procedure to obtain a transmission opportunity (TxOP) for communicating with a second UE, the TxOP including a plurality of contiguous slots, and the slot reservation procedure being performed in an earliest slot in the TxOP in which the first UE has data to send to the second UE;

means for transmitting the data to the second UE using at least one slot in the TxOP when the slot reservation procedure is successful, all remaining slots in the TxOP being reserved for the first UE when the slot reservation procedure is successful; and

means for refraining from performing a subsequent slot reservation procedure in another slot in the TxOP when the slot reservation procedure is unsuccessful unless an end of transmission signal is received during the TxOP.

16. The apparatus of claim 15, wherein the means for performing the slot reservation procedure for the TxOP is configured to:

transmit a first request-to-send (RTS) signal using a first set of reservation symbols in the earliest slot in the TxOP in which the first UE has the data to transmit to the second UE, the first RTS signal including at least in part a first UE identification (ID) associated with the first UE.

17. The apparatus of claim 16, wherein the means for performing the slot reservation procedure for the TxOP is further configured to:

determine whether a second RTS signal is transmitted by a third UE using the first set of reservation symbols in the earliest slot of the TxOP in which the first UE has the data to transmit to the second UE, the second RTS signal including at least in part a second UE ID associated with the third UE,

wherein the slot reservation procedure is successful when the second RTS signal is not detected during the first set of reservation symbols.

18. The apparatus of claim 17, wherein upon determining that the second RTS signal is transmitted by the third UE using the first set of reservation symbols, the means for performing the slot reservation procedure for the TxOP is further configured to:

determine whether a measured power level associated with the second RTS signal is greater than a threshold level,

wherein the slot reservation procedure is successful when the measured power level associated with the second RTS signal transmitted by the third UE is less than the threshold level.

19. The apparatus of claim 18, wherein upon determining that the measured power level associated with the second RTS signal transmitted by the third UE is greater than or equal to the threshold level, the means for performing the slot reservation procedure for the TxOP is further configured to:

determine whether the first UE ID associated with the first UE has a higher priority than the second UE ID associated with the third UE,

wherein the slot reservation procedure is successful when the first UE ID has the higher priority than the second UE ID,

wherein the slot reservation procedure is unsuccessful when the first UE ID has a lower priority than the second UE ID, and

wherein when the first UE ID and the second UE ID are associated with a same priority, the slot reservation procedure includes prioritizing a UE having a higher UE ID value.

20. The apparatus of claim 17, wherein the first RTS signal indicates in which of the plurality of contiguous slots of the TxOP the data will be transmitted by the first UE, or wherein the second RTS signal indicates in which of the plurality of contiguous slots of the TxOP second data will be transmitted by the third UE.

21. The apparatus of claim 15, wherein the means for performing the slot reservation procedure for the TxOP is configured to transmit the end of transmission signal using a second set of reservation symbols located subsequent to a first, final slot in the TxOP in which the first UE transmits the data to the second UE, when the slot reservation procedure is successful, and

wherein the means for performing the slot reservation procedure for the TxOP is configured to receive the end of transmission signal using a third set of reservation symbols located subsequent to a second, final slot in the TxOP in which a third UE sends second data and perform the subsequent slot reservation procedure in any remaining slots in the TxOP upon receiving the end of transmission signal, when the slot reservation procedure is unsuccessful.

22. An apparatus for wireless communication of a first user equipment (UE), comprising:

a memory; and

at least one processor coupled to the memory and configured to;

perform a slot reservation procedure to obtain a transmission opportunity (TxOP) for communicating with a second UE, the TxOP including a plurality of contiguous slots, and the slot reservation procedure being performed in an earliest slot in the TxOP in which the first UE has data to send to the second UE;

transmit the data to the second UE using at least one slot in the TxOP when the slot reservation procedure is successful, all remaining slots in the TxOP being reserved for the first UE when the slot reservation procedure is successful; and

refrain from performing a subsequent slot reservation procedure in another slot in the TxOP when the slot reservation procedure is unsuccessful unless an end of transmission signal is received during the TxOP.

23. The apparatus of claim 22, wherein in order to perform the slot reservation procedure for the TxOP, the at least one processor is further configured to:

transmit a first request-to-send (RTS) signal using a first set of reservation symbols in the earliest slot in the TxOP in which the first UE has the data to transmit to the second UE, the first RTS signal including at least in part a first UE identification (ID) associated with the first UE.

24. The apparatus of claim 23, wherein in order to perform the slot reservation procedure for the TxOP, the at least one processor is further configured to:

determine whether a second RTS signal is transmitted by a third UE using the first set of reservation symbols in the earliest slot of the TxOP in which the first UE has the data to transmit to the second UE, the second RTS signal including at least in part a second UE ID associated with the third UE,

wherein the slot reservation procedure is successful when the second RTS signal is not detected during the first set of reservation symbols.

25. The apparatus of claim 24, wherein upon determining that the second RTS signal is transmitted by the third UE using the first set of reservation symbols, the at least one processor is further configured to:

determine whether a measured power level associated with the second RTS signal is greater than a threshold level,

wherein the slot reservation procedure is successful when the measured power level associated with the second RTS signal transmitted by the third UE is less than the threshold level.

26. The apparatus of claim 25, wherein upon determining that the measured power level associated with the second RTS signal transmitted by the third UE is greater than or equal to the threshold level, the at least one processor is further configured to:

determine whether the first UE ID associated with the first UE has a higher priority than the second UE ID associated with the third UE,

wherein the slot reservation procedure is successful when the first UE ID has the higher priority than the second UE ID, and

wherein the slot reservation procedure is unsuccessful when the first UE ID has a lower priority than the second UE ID.

27. The apparatus of claim 26, wherein the at least one processor is configured to:

transmit a first clear-to-send (CTS) signal using a second set of reservation symbols in the earliest slot of the TxOP in which the first UE has the data to send to the second UE upon determining that the first UE ID has the lower priority than the second UE ID; and

refrain from sending the first CTS signal to the third UE upon determining that the first UE ID has the higher priority than the second UE ID.

28. The apparatus of claim 27, wherein the at least one processor is configured to:

receive a second CTS signal in the second set of reservation symbols in the earliest slot of the TxOP in which the first UE has the data to transmit to the second UE when the first UE ID has the higher priority than the second UE ID.

29. The apparatus of claim 22, wherein the at least one processor is configured to transmit the end of transmission signal using a second set of reservation symbols located subsequent to a first, final slot in the TxOP in which the first UE transmits the data to the second UE, when the slot reservation procedure is successful, and

wherein the at least one processor is configured to receive the end of transmission signal using a third set of reservation symbols located subsequent to a second, final slot in the TxOP in which a third UE sends second data and perform the subsequent slot reservation procedure in any remaining slots in the TxOP upon receiving the end of transmission signal, when the slot reservation procedure is unsuccessful.

30. A computer-readable medium storing computer executable a first user equipment (UE), comprising code to:

perform a slot reservation procedure to obtain a transmission opportunity (TxOP) for communicating with a second UE, the TxOP including a plurality of contiguous slots, and the slot reservation procedure being performed in an earliest slot in the TxOP in which the first UE has data to send to the second UE;

transmit the data to the second UE using at least one slot in the TxOP when the slot reservation procedure is successful, all remaining slots in the TxOP being reserved for the first UE when the slot reservation procedure is successful; and

refrain from performing a subsequent slot reservation procedure in another slot in the TxOP when the slot reservation procedure is unsuccessful unless an end of transmission signal is received during the TxOP.