Fast cell reselection

Patent metadata

Field	Value
Publication number	US-10588068-B2
Application number	US-201515762439-A
Country	US
Kind code	B2
Filing date	Dec 29, 2015
Priority date	Dec 29, 2015
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

A user equipment (UE) expedites cell reselection. In one instance, the UE starts a reselection timer for reselecting to a neighbor cell when a signal quality of a serving cell is determined to fall below a first threshold. The UE then expedites reselecting to the neighbor cell based on a difference between the signal quality of the serving cell and the signal quality of the neighbor cell when the signal quality of the serving cell falls below a second threshold.

First claim

What is claimed is:

1. A method for wireless communication comprising:
starting a reselection timer for reselecting to a neighbor cell when a signal quality of a serving cell is determined to fall below a first threshold and when a signal quality of the neighbor cell exceeds a neighbor cell threshold; and
speeding up reselecting to the neighbor cell based at least in part on a difference between the signal quality of the serving cell and the signal quality of the neighbor cell when the signal quality of the serving cell falls below a second threshold, in which speeding up the reselecting to the neighbor cell comprises reselecting to the neighbor cell prior to a scheduled expiration of the reselection timer without changing the reselection timer.

2. The method of claim 1 , further comprising speeding up the reselecting to the neighbor cell when the difference between the signal quality of the serving cell and the signal quality of the neighbor cell is above a third threshold.

3. The method of claim 1 , in which the reselecting occurs prior to a call setup on a user equipment.

4. The method of claim 1 , in which the first threshold is a user equipment (UE) defined threshold.

5. An apparatus for wireless communication comprising:
a memory unit; and
at least one processor coupled to the memory unit, the at least one processor configured:
to start a reselection timer for reselecting to a neighbor cell when a signal quality of a serving cell is determined to fall below a first threshold and when a signal quality of the neighbor cell exceeds a neighbor cell threshold; and
to speed up reselecting to the neighbor cell based at least in part on a difference between the signal quality of the serving cell and the signal quality of the neighbor cell when the signal quality of the serving cell falls below a second threshold, in which the at least one processor is further configured to speed up the reselecting by reselecting to the neighbor cell prior to a scheduled expiration of the reselection timer without changing the reselection timer.

6. The apparatus of claim 5 , in which the at least one processor is further configured to speed up the reselecting to the neighbor cell when the difference between the signal quality of the serving cell and the signal quality of the neighbor cell is above a third threshold.

7. The apparatus of claim 5 , in which the reselecting occurs prior to a call setup on a user equipment.

8. The apparatus of claim 5 , in which the first threshold is a user equipment (UE) defined threshold.

9. An apparatus for wireless communication comprising:
means for starting a reselection timer for reselecting to a neighbor cell when a signal quality of a serving cell is determined to fall below a first threshold and when a signal quality of the neighbor cell exceeds a neighbor cell threshold; and
means for speeding up reselecting to the neighbor cell based at least in part on a difference between the signal quality of the serving cell and the signal quality of the neighbor cell when the signal quality of the serving cell falls below a second threshold, in which the means for speeding up the reselecting to the neighbor cell comprises means for reselecting to the neighbor cell prior to a scheduled expiration of the reselection timer without changing the reselection timer.

10. The apparatus of claim 9 , further comprising means for speeding up the reselecting to the neighbor cell when the difference between the signal quality of the serving cell and the signal quality of the neighbor cell is above a third threshold.

11. The apparatus of claim 9 , in which the reselecting occurs prior to a call setup on a user equipment.

12. The apparatus of claim 9 , in which the first threshold is a user equipment (UE) defined threshold.

13. A non-transitory computer-readable medium having program code recorded thereon, the program code executed by a processor and comprising:
program code to start a reselection timer for reselecting to a neighbor cell when a signal quality of a serving cell is determined to fall below a first threshold and when a signal quality of the neighbor cell exceeds a neighbor cell threshold; and
program code to speed up reselecting to the neighbor cell based at least in part on a difference between the signal quality of the serving cell and the signal quality of the neighbor cell when the signal quality of the serving cell falls below a second threshold, in which the program code to speed up the reselecting to the neighbor cell further comprises program code to reselect to the neighbor cell prior to a scheduled expiration of the reselection timer without changing the reselection timer.

14. The non-transitory computer-readable medium of claim 13 , in which the program code further comprises program code to speed up the reselecting to the neighbor cell when the difference between the signal quality of the serving cell and the signal quality of the neighbor cell is above a third threshold.

15. The non-transitory computer-readable medium of claim 13 , in which the reselecting occurs prior to a call setup on a user equipment.

16. The non-transitory computer-readable medium of claim 13 , in which the first threshold is a user equipment (UE) defined threshold.

Assignees

• Qualcomm Inc
• Xie Ling
• TSAI Shiau He
• Mao Jie
• Zhang Yan
• Chen Huichun
• Wang Shanshan
• Tian Song
• Xie Yong

Inventors

• Xie Ling
• Tsai Shiau-He
• Mao Jie
• Zhang Yan
• Chen Huichun
• Wang Shanshan
• Tian Song
• Xie Yong

Classifications

• H04W48/20 Primary

  Selecting an access point · CPC title

• H04W48/16

  Discovering, processing access restriction or access information · CPC title

• H04W36/30 Primary

  by measured or perceived connection quality data · CPC title

• H04W36/0085

  Hand-off measurements · CPC title

• H04W36/302 Primary

  due to low signal strength · CPC title