Method and device for adjusting random access backoff parameter

• US 10,542,470 B2
• Filed: 03/19/2018
• Issued: 01/21/2020
• Est. Priority Date: 03/22/2017
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Youngdae, Lee, Sunyoung
• Primary Examiner(s): Moore, Jr., Michael J
• Application Number:
  US16/307,405
• Publication Number:
  US 20190098540A1
• Time in Patent Office: 673 Days
• Field of Search: None
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 36/0058 Transmission of hand-off measurement information, e.g. measurement reports
• CPC Class Codes: H04W 36/0077 of access information of target access point
• CPC Class Codes: H04W 36/0085 Hand-off measurements
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/085 collision avoidance
• CPC Class Codes: H04W 74/0875 with assigned priorities based access
• CPC Class Codes: H04W 76/11 Allocation or use of connection identifiers
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 80/02 Data link layer protocols

Abstract

Provided are a method for a terminal adjusting a random access backoff parameter in a wireless communication system, and a device supporting same. The method may comprise the steps of: receiving priority information; initiating a random access procedure while executing a handover; receiving, from a base station, a random access response including a backoff indicator; and on the basis of the priority information, adjusting a random access backoff parameter indicated by the backoff indicator.

Claims

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:

receiving, from a base station, a scaling factor for prioritized random access;

initiating a random access procedure;

receiving, from the base station, a random access response comprising a backoff indicator;

determining whether the random access procedure was initiated for a handover;

based on a determination that the random access procedure was initiated for the handover, applying the scaling factor to the backoff indicator to set a random access backoff time; and

transmitting, after the random access backoff time, a random access preamble to the base station.

2. The method of claim 1, wherein applying the scaling factor to the backoff indicator to set the random access backoff time comprises:

based on the determination that the random access procedure was initiated for the handover, determining the random access backoff time based on a product of the backoff indicator and the scaling factor.

3. The method of claim 1, wherein applying the scaling factor to the backoff indicator to set the random access backoff time comprises:

based on the determination that the random access procedure was initiated for the handover, adjusting the random access backoff time by the scaling factor, wherein the random access backoff time is related to the backoff indicator.

4. The method of claim 1, wherein the scaling factor has a value less than one.

5. The method of claim 4, wherein the scaling factor has a value of zero.

6. The method of claim 1, wherein applying the scaling factor to the backoff indicator to set the random access backoff time comprises:

based on the determination that the random access procedure was initiated for the handover, adjusting the random access backoff time to a value of zero based on the backoff indicator and the scaling factor.

7. The method of claim 1, wherein the random access backoff time is related to a second backoff value that is equal to a first backoff value multiplied by the scaling factor, and wherein the first backoff value corresponds to the backoff indicator.

8. The method of claim 7, wherein the random access backoff time is equal to a uniformly distributed value between 0 and the second backoff value.

9. The method of claim 1, wherein initiating the random access procedure comprises:

initiating the random access procedure for the handover from a first base station to a second base station with which the UE communicates.

10. A user equipment (UE) configured to operate in a wireless communication system, the UE comprising:

at least one radio frequency (RF) module;

at least one processor; and

at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising;

receiving, through the RF module and from a base station, a scaling factor for prioritized random access;

initiating a random access procedure;

receiving, through the RF module and from the base station, a random access response comprising a backoff indicator;

determining whether the random access procedure was initiated for a handover;

based on a determination that the random access procedure was initiated for the handover, applying the scaling factor to the backoff indicator to set a random access backoff time; and

transmitting, through the RF module and after the random access backoff time, a random access preamble to the base station.

11. The UE of claim 10, wherein applying the scaling factor to the backoff indicator to set the random access backoff time comprises:

based on the determination that the random access procedure was initiated for the handover, determining the random access backoff time based on a product of the backoff indicator and the scaling factor.

12. The UE of claim 10, wherein applying the scaling factor to the backoff indicator to set the random access backoff time comprises:

based on the determination that the random access procedure was initiated for the handover, adjusting the random access backoff time by the scaling factor, wherein the random access backoff time is related to the backoff indicator.

13. The UE of claim 10, wherein the scaling factor has a value less than one.

14. The UE of claim 13, wherein the scaling factor has a value of zero.

15. The UE of claim 10, wherein applying the scaling factor to the backoff indicator to set the random access backoff time comprises:

based on the determination that the random access procedure was initiated for the handover, adjusting the random access backoff time to a value of zero based on the backoff indicator and the scaling factor.

16. The UE of claim 10, wherein the random access backoff time is related to a second backoff value that is equal to a first backoff value multiplied by the scaling factor, and wherein the first backoff value corresponds to the backoff indicator.

17. The UE of claim 16, wherein the random access backoff time is equal to a uniformly distributed value between 0 and the second backoff value.

18. The UE of claim 10, wherein initiating the random access procedure comprises:

initiating the random access procedure for the handover from a first base station to a second base station with which the UE communicates.