Handover optimization for high mobility communications

Patent metadata

Field	Value
Publication number	US-2024314648-A1
Application number	US-202118571145-A
Country	US
Kind code	A1
Filing date	Aug 20, 2021
Priority date	Aug 20, 2021
Publication date	Sep 19, 2024
Grant date	—

Abstract

Methods, systems, and devices for wireless communications at a user equipment (UE) are described. The UE may identify that the UE is operating in a high mobility environment, that a first reference signal received power associated with a first cell is decreasing, and that a second reference signal received power associated with a second cell is increasing. The UE may transmit a request for a handover from the first cell to the second cell based on the identifying, the transmitting performed at a time that may be based on one or more network-configured handover timing parameters having one or more values adjusted by the UE. The UE may receive a handover command in response to transmitting the request for handover. The UE may perform a handover from the first cell to the second cell in response to the handover command.

First claim

What is claimed is:

1 . A method for wireless communications at a user equipment (UE), comprising:
identifying that the UE is operating in a high mobility environment, that a first reference signal received power associated with a first cell is decreasing, and that a second reference signal received power associated with a second cell is increasing; transmitting a request for a handover from the first cell to the second cell based at least in part on the identifying, the transmitting performed at a time that is based at least in part on one or more network-configured handover timing parameters having one or more values adjusted by the UE; receiving a handover command in response to transmitting the request for handover; and performing a handover from the first cell to the second cell in response to the handover command.

2 . The method of claim 1 , further comprising:
adjusting a value of a first network-configured handover timing parameter of the one or more network-configured handover timing parameters, wherein:
the first network-configured handover timing parameter corresponds to a delay between a first time at which a difference between the second reference signal received power and the first reference signal received power satisfies a threshold and a second time at which the request for handover is transmitted; and
the time at which the UE transmits the request for handover is based at least in part on the adjusted value of the first network-configured handover timing parameter.

3 . The method of claim 2 , wherein the adjusted value of the first network-configured handover timing parameter is zero.

4 . The method of claim 1 , further comprising:
adjusting a value of a second network-configured handover timing parameter of the one or more network-configured handover timing parameters, wherein:
the second network-configured handover timing parameter corresponds to a threshold difference between the second reference signal received power and the first reference signal received power; and
the time at which the UE transmits the request for handover is based at least in part on a difference between the second reference signal received power and the first reference signal received power satisfying the adjusted value of the second network-configured handover timing parameter.

5 . The method of claim 4 , wherein the adjusted value of the second network-configured handover timing parameter is zero.

6 . The method of claim 1 , further comprising:
adjusting a value of a third network-configured handover timing parameter of the one or more network-configured handover timing parameters after performing the handover, wherein the adjusted value of the third network-configured handover timing parameter decreases a likelihood of the UE initiating a second handover from the second cell to the first cell.

7 . The method of claim 1 , wherein transmitting the request for the handover is based at least in part on the first reference signal received power becoming less than or equal to the second reference signal received power.

8 . The method of claim 1 , wherein transmitting the request for the handover comprises transmitting a measurement report based at least in part on the first reference signal received power associated with the first cell, the second reference signal received power associated with the second cell, or any combination thereof.

9 . The method of claim 1 , further comprising:
identifying a sequence of cells associated with a mobility path of the UE, wherein transmitting the request for the handover from the first cell to the second cell is based at least in part on the second cell being subsequent to the first cell within the sequence of cells.

10 . The method of claim 1 , wherein receiving the handover command comprises receiving downlink control information that comprises the handover command.

11 . The method of claim 1 , further comprising:
storing, at the UE, an indication of the high mobility environment based at least in part on identifying that the UE is operating in the high mobility environment.

12 . The method of claim 1 , wherein the high mobility environment is associated with a high-speed train.

13 . The method of claim 1 , wherein the high mobility environment is associated with a motor vehicle.

14 . The method of claim 1 , further comprising:
receiving one or more first values of the one or more network-configured handover timing parameters from a network entity; and setting, after receiving the one or more first values, the one or more network-configured handover timing parameters to have one or more second values, wherein the one or more network-configured handover timing parameters have the one or more values adjusted by the UE based at least in part on the UE setting the one or more network-configured handover timing parameters to have the one or more second values.

15 . An apparatus for wireless communications, comprising:
a processor of a user equipment (UE); a transceiver coupled with the processor; and memory coupled with the processor, the memory and the processor configured to cause the apparatus to:
identify that the UE is operating in a high mobility environment, that a first reference signal received power associated with a first cell is decreasing, and that a second reference signal received power associated with a second cell is increasing;
transmit, via the transceiver, a request for a handover from the first cell to the second cell based at least in part on the identifying, the transmitting performed at a time that is based at least in part on one or more network-configured handover timing parameters having one or more values adjusted by the UE;
receive, via the transceiver, a handover command in response to transmitting the request for handover; and
perform a handover from the first cell to the second cell in response to the handover command.

16 . The apparatus of claim 15 , the memory and the processor further configured to cause the apparatus to:
adjust a value of a first network-configured handover timing parameter of the one or more network-configured handover timing parameters, wherein:
the first network-configured handover timing parameter corresponds to a delay between a first time at which a difference between the second reference signal received power and the first reference signal received power satisfies a threshold and a second time at which the request for handover is transmitted; and
the time at which the UE transmits the request for handover is based at least in part on the adjusted value of the first network-configured handover timing parameter.

17 . The apparatus of claim 16 , wherein the adjusted value of the first network-configured handover timing parameter is zero.

18 . The apparatus of claim 15 , the memory and the processor further configured to cause the apparatus to:
adjust a value of a second network-configured handover timing parameter of the one or more network-configured handover timing parameters, wherein:
the second network-configured handover timing parameter corresponds to a threshold difference between the second reference signal received power and the first reference signal received power; and
the time at which the UE transmits the request for handover is based at least in part on a difference between the second reference signal received power and the first reference signal received power satisfying the adjusted value of the second 10 network-configured handover timing parameter.

19 . The a

Assignees

• Qualcomm Inc

Inventors

• Liu Zhanyi
• Wu Yongle
• Mohanty Rashmi Ranjan
• Li Jing
• Rajendran Rajarajan
• Mao Jie
• Mantravadi Ashok
• Zhu Jie
• Wu Nanrun

Classifications

• H04W36/302 Primary

  due to low signal strength · CPC title

• H04W36/304

  due to measured or perceived resources with higher communication quality · CPC title

• H04W36/32

  by location or mobility data, e.g. speed data · CPC title

• H04W36/34

  Reselection control · CPC title

• H04W36/00837

  Determination of triggering parameters for hand-off · CPC title