IP Library › Granted Patent US 10,143,015

Granted Patent B2

US 10,143,015 · App. 15/461,181 · Granted Nov 27, 2018

Contention-based random access in unlicensed spectrum

Inventors: Aleksandar Damnjanovic (Del Mar, CA); Qingsi Wang (San Diego, CA); Vikas Jain (San Diego, CA)

Assignee: QUALCOMM Incorporated

H04W74/085 H04L27/2602 H04W28/0278 H04W64/00 H04W74/0833

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Quick Facts

Patent No.: US 10,143,015
App. No.: 15/461,181
Granted: Nov 27, 2018
Kind: B2

External Links

USPTO Patent Center↗ Full Patent PDF↗

Abstract

The disclosure provides a method and system for requesting access to resources for uplink communications in unlicensed spectrum. In particular, a user equipment (UE) may detect one or more of a first type of data or a second type of data to be transmitted to a base station (BS). The UE may then determine if a first type of physical random access channel (PRACH) resource is available for transmitting one or more of the first type of data or the second type of data to the BS. If the first type of PRACH resource is available, then the UE may transmit one or more of the first type of data or the second type of data using the first type of PRACH resource. If the first type of PRACH resource is not available, then the UE may transmit the second type of data using a second type of PRACH resource.

Claims (89)

1. A method of wireless communication, comprising:

detecting, by a user equipment (UE), at least one of a first type of data or a second type of data to be transmitted from the UE to a base station (BS) over a channel;

determining, by the UE, if a first type of physical random access channel (PRACH) resource is available for transmitting at least one of the first type of data or the second type of data to the BS;

transmitting at least one of the first type of data or the second type of data using the first type of PRACH resource based at least in part on determining the first type of PRACH resource is available; and

transmitting the second type of data using a second type of PRACH resource based at least in part on determining the first type of PRACH resource is not available.

2. The method of claim 1 , wherein:

the first type of PRACH resource is available when the BS accesses the channel; and

the second type of PRACH resource is available when the BS does not access the channel.

3. The method of claim 1 , wherein:

the first type of data includes a plurality of buffer status reports; and

the second type of data includes a subset of the plurality of the buffer status reports.

4. The method of claim 1 , further comprising transmitting the second type of data using the first type of PRACH resource if the UE determines the first type of PRACH resource is available after transmitting the second type of data using the second type of PRACH resource.

5. The method of claim 1 , wherein:

the second type of PRACH resource includes a variable number of orthogonal frequency division multiplexing (OFDM) symbols.

6. The method of claim 1 , further comprising:

determining at least one of a clear channel assessment (CCA) status for the first type of PRACH resource in response to determining the first type of PRACH resource is available; and

wherein the transmitting the first type of data or the second type of data using the first type of PRACH resource is performed in response to determining at least one of a successful CCA status for the first type of PRACH resource.

7. The method of claim 1 , further comprising:

determining at least one of a clear channel assessment (CCA) status or an extended CCA (eCCA) status for the second type of PRACH resource in response to determining the first type of PRACH resource is not available; and

wherein the transmitting the second type of data using the second type of PRACH resource is performed in response to determining at least one of a successful CCA status or a successful eCCA status for the second type of PRACH resource.

8. The method of claim 1 , further comprising:

verifying at least one of the first type of data or the second type of data is to be transmitted in response to determining the first type of PRACH resource is not available; and

repeating the determining until the verifying indicates the first type of data or the second type of data is not to be transmitted.

9. The method of claim 1 , wherein transmitting the second type of data using the second type of PRACH resource further comprises:

selecting a duration for the transmitting the second type of data based on a location of the UE in a cell of the BS.

10. The method of claim 1 , wherein transmitting the second type of data using the second type of PRACH resource further comprises:

determining a time for the transmitting the second type of data based on a timer or a number of transmission attempts in a time period.

11. An apparatus for wireless communication, comprising:

a transceiver;

a memory configured to store instructions; and

one or more processors communicatively coupled to the transceiver and the memory, the one or more processors configured to execute the instructions to:

detect at least one of a first type of data or a second type of data to be transmitted to a base station (BS) over a channel;

determine if a first type of physical random access channel (PRACH) resource is available for transmitting at least one of the first type of data or the second type of data to the BS;

transmit at least one of the first type of data or the second type of data using the first type of PRACH resource based at least in part on determining the first type of PRACH resource is available; and

transmit the second type of data using a second type of PRACH resource based at least in part on determining the first type of PRACH resource is not available.

12. The apparatus of claim 11 , wherein:

the first type of PRACH resource is available when the BS accesses the channel; and

the second type of PRACH resource is available when the BS does not access the channel.

13. The apparatus of claim 11 , wherein:

the first type of data includes a plurality of buffer status reports; and

the second type of data includes a subset of the plurality of the buffer status reports.

14. The apparatus of claim 11 , wherein the one or more processors are further configured to transmit the second type of data using the first type of PRACH resource if the UE determines the first type of PRACH resource is available after transmitting the second type of data using the second type of PRACH resource.

15. The apparatus of claim 11 , wherein:

the second type of PRACH resource includes a variable number of orthogonal frequency division multiplexing (OFDM) symbols.

16. The apparatus of claim 11 , wherein the one or more processors are further configured to:

determine at least one of a clear channel assessment (CCA) status for the first type of PRACH resource in response to determining the first type of PRACH resource is available; and

17. The apparatus of claim 11 , wherein the one or more processors are further configured to:

determine at least one of a clear channel assessment (CCA) status or an extended CCA (eCCA) status for the second type of PRACH resource in response to determining the first type of PRACH resource is not available; and

18. The apparatus of claim 11 , wherein the one or more processors are further configured to:

verify at least one of the first type of data or the second type of data is to be transmitted in response to determining the first type of PRACH resource is not available; and

repeat the determining until the verifying indicates the first type of data or the second type of data is not to be transmitted.

19. The apparatus of claim 11 , wherein transmitting the second type of data using the second type of PRACH resource further comprises:

selecting a duration for the transmitting the second type of data based on a location of the UE in a cell of the BS.

20. The apparatus of claim 11 , wherein transmitting the second type of data using the second type of PRACH resource further comprises:

determining a time for the transmitting the second type of data based on a timer or a number of transmission attempts in a time period.

21. An apparatus for wireless communication, comprising:

means for detecting at least one of a first type of data or a second type of data to be transmitted to a base station (BS) over a channel;

means for determining if a first type of physical random access channel (PRACH) resource is available for transmitting at least one of the first type of data or the second type of data to the BS;

means for transmitting at least one of the first type of data or the second type of data using the first type of PRACH resource based at least in part on determining the first type of PRACH resource is available; and

means for transmitting the second type of data using a second type of PRACH resource based at least in part on determining the first type of PRACH resource is not available.

22. A non-transitory computer-readable medium storing computer executable code, comprising:

code that when executed by a computer causes the computer to:

detect at least one of a first type of data or a second type of data to be transmitted to a base station (BS) over a channel;

determine if a first type of physical random access channel (PRACH) resource is available for transmitting at least one of the first type of data or the second type of data to the BS;

transmit the second type of data using a second type of PRACH resource based at least in part on determining the first type of PRACH resource is not available.

23. The non-transitory computer-readable medium of claim 22 , wherein:

the first type of PRACH resource is available when the BS accesses the channel; and

the second type of PRACH resource is available when the BS does not access the channel.

24. The non-transitory computer-readable medium of claim 22 , wherein:

the first type of data includes a plurality of buffer status reports; and

the second type of data includes a subset of the plurality of the buffer status reports.

25. The non-transitory computer-readable medium of claim 22 , further comprising code that when executed by a computer causes the computer to:

transmit the second type of data using the first type of PRACH resource if the UE determines the first type of PRACH resource is available after transmitting the second type of data using the second type of PRACH resource.

26. The non-transitory computer-readable medium of claim 22 , wherein:

the second type of PRACH resource includes a variable number of orthogonal frequency division multiplexing (OFDM) symbols.

27. The non-transitory computer-readable medium of claim 22 , further comprising code that when executed by a computer causes the computer to:

determine at least one of a clear channel assessment (CCA) status for the first type of PRACH resource in response to determining the first type of PRACH resource is available; and

28. The non-transitory computer-readable medium of claim 22 , further comprising code that when executed by a computer causes the computer to:

29. The non-transitory computer-readable medium of claim 22 , further comprising code that when executed by a computer causes the computer to:

verify at least one of the first type of data or the second type of data is to be transmitted in response to determining the first type of PRACH resource is not available; and

repeat the determining until the verifying indicates the first type of data or the second type of data is not to be transmitted.

30. The non-transitory computer-readable medium of claim 22 , wherein the transmitting the second type of data using the second type of PRACH resource further comprises:

select a duration for the transmitting the second type of data based on a location of the UE in a cell of the BS.

Assignments (1)

ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 11, 2017

From: DAMNJANOVIC, ALEKSANDAR; WANG, QINGSI; JAIN, VIKAS

To: QUALCOMM INCORPORATED

Reel/Frame 041968/0454 →

Continuity (2)

Provisional Application 62310485 · Mar 18, 2016

Related Publication 20170273108A1 · Sep 21, 2017