Limiting handoffs between wireless communication networks during a time period

Patent metadata

Field	Value
Publication number	US-11671887-B2
Application number	US-202117232002-A
Country	US
Kind code	B2
Filing date	Apr 15, 2021
Priority date	Apr 17, 2020
Publication date	Jun 6, 2023
Grant date	Jun 6, 2023

Abstract

This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer-readable media, for limiting handoffs in cellular networks. In some aspects, a user equipment (UE) may determine a quantity of handoffs that are performed between two or more radio access technologies (RATs) during a time period. The UE may determine whether the quantity of handoffs exceeds a handoff threshold within the time period. The UE may reduce a rate of handoffs when the UE determines that the quantity of handoffs exceeds the handoff threshold within the time period. The UE also may select one of the RATs to camp on and maintain the wireless connection when the UE determines that the quantity of handoffs exceeds the handoff threshold. The UE may determine which RAT to camp on based on handoff count information, handoff total connection time information, or contextual awareness information.

First claim

What is claimed is:

1. A method for wireless communication performed by an apparatus of a user equipment (UE), comprising:
monitoring a quantity of handoffs between different radio access technologies (RATs) of a plurality of RATs during a time period;
prioritizing one of the plurality of RATs; and
reducing a rate of handoffs associated with the UE and selecting the one of the plurality of RATs for maintaining a wireless connection with the UE in response to the quantity of handoffs exceeding a handoff threshold within the time period.

2. The method of claim 1 , wherein the plurality of RATs include two or more of a first RAT, a second RAT, and a third RAT, the first RAT being a 5G New Radio (NR) RAT, a Long-Term Evolution (LTE) RAT, or a 3G RAT, the second RAT being a 5G NR RAT, an LTE RAT, or a 3G RAT, and the third RAT being a wireless local area network (WLAN) RAT.

3. The method of claim 1 , wherein:
monitoring the quantity of handoffs between the plurality of RATs during the time period includes monitoring a quantity of handovers and reselections between the plurality of RATs during the time period, and
reducing the rate of handoffs associated with the UE includes reducing a rate of handovers and reselections associated with the UE.

4. The method of claim 1 , wherein reducing the rate of handoffs associated with the UE includes reducing a rate of handovers associated with the UE, further comprises:
reducing a frequency of transmission of a handover measurement report to reduce the rate of handovers.

5. The method of claim 1 , wherein reducing the rate of handoffs associated with the UE includes reducing a rate of handovers and reselections associated with the UE, further comprises:
ignoring a subset of handover and reselection related messages received by the UE from the plurality of RATs to reduce the rate of handovers and reselections.

6. The method of claim 1 , wherein selecting one of the plurality of RATs further comprises:
determining a first portion of the quantity of handoffs are handoffs to a first RAT of the plurality of RATs;
determining a second portion of the quantity of handoffs are handoffs to a second RAT of the plurality of RATs;
determining the first portion is greater than the second portion; and
selecting the first RAT in response to determining the first portion is greater than the second portion.

7. The method of claim 1 , wherein selecting one of the plurality of RATs further comprises:
determining timestamp information at a time instant when each of the quantity of handoffs is initiated;
determining a first portion of the quantity of handoffs are handoffs to a first RAT of the plurality of RATs;
determining a first total connection time associated with the first portion of the quantity of handoffs to the first RAT based on the timestamp information;
determining a second portion of the quantity of handoffs are handoffs to a second RAT of the plurality of RATs;
determining a second total connection time associated with the second portion of the quantity of handoffs to the second RAT based on the timestamp information;
determining the first total connection time associated with the first RAT is greater than the second total connection time associated with the second RAT; and
selecting the first RAT in response to determining the first total connection time is greater than the second total connection time.

8. The method of claim 1 , wherein selecting one of the plurality of RATs further comprises:
collecting contextual awareness information associated with the UE over a period of time; and
selecting the one of the plurality of RATs based, at least in part, on the collected contextual awareness information.

9. The method of claim 8 , further comprising:
determining historical contextual awareness information based on the collected contextual awareness information;
determining real-time contextual awareness information associated with the UE; and
selecting the one of the plurality of RATs based on the historical contextual awareness information and the real-time contextual awareness information.

10. The method of claim 9 , wherein reducing the rate of handoffs includes reducing a rate of handovers, further comprises:
reducing a frequency of transmission of a handover measurement report to reduce the rate of handovers based on the historical contextual awareness information, or
altering the handover measurement report to reduce the rate of handovers based on the historical contextual awareness information.

11. The method of claim 9 , further comprising:
altering a handover measurement report based on the historical contextual awareness information for maintaining the wireless connection with the selected one of the plurality of RATs; and
transmitting the altered handover measurement report to cause the wireless connection to be maintained with the selected one of the plurality of RATs.

12. The method of claim 1 , further comprising:
collecting contextual awareness information associated with the UE over a period of time,
wherein reducing the rate of handoffs associated with the UE is based, at least in part, on the contextual awareness information.

13. The method of claim 12 , further comprising:
determining historical contextual awareness information based on the collected contextual awareness information; and
determining real-time contextual awareness information associated with the UE,
wherein reducing the rate of handoffs associated with the UE is based, at least in part, on the historical contextual awareness information, the real-time contextual awareness information, or both.

14. The method of claim 13 , wherein:
a determination of the historical contextual awareness information and the real-time contextual awareness information is performed by an application processor of the UE, and
a reduction of the rate of handoffs associated with the UE is performed by a modem of the UE in response to receiving a command from the application processor, the command provided by the application processor to the modem based on the historical contextual awareness information, the real-time contextual awareness information, or both.

15. A method for wireless communication performed by an apparatus of a user equipment (UE), comprising:
monitoring a quantity of handovers between different radio access technologies (RATs) of a plurality of RATs during a time period;
prioritizing one of the plurality of RATs;
selecting the one of the plurality of RATs and reducing a rate of handovers associated with the UE in response to the quantity of handovers exceeding a handover threshold within the time period; and
altering a handover measurement report to cause a wireless connection to be maintained with the selected one of the plurality of RATs.

16. The method of claim 15 , wherein altering the handover measurement report to cause the wireless connection to be maintained with the selected one of the plurality of RATs further comprises:
altering measurement information of the handover measurement report; and
transmitting the altered handover measurement report to cause the wireless connection to be maintained with the selected one of the plurality of RATs.

17. The method of claim 16 , wherein altering the measurement information of the handover measurement report further comprises:
collecting contextual awareness information associated with the UE over a period of time;
determining historical contextual awareness information based on the collected contextual awareness information; and
altering the measurement i

Assignees

• Qualcomm Inc

Inventors

• Chin Tom
• Chen An Mei
• Chourasia Ajit
• Payyappilly Ajith Tom
• Zhang Juan

Classifications

• H04W36/04 Primary

  Reselecting a cell layer in multi-layered cells · CPC title

• H04W36/0033

  with transfer of context information · CPC title

• H04W36/008375 Primary

  based on historical data · CPC title

• H04W36/0058

  Transmission of hand-off measurement information, e.g. measurement reports · CPC title

• H04W36/0094 Primary

  Definition of hand-off measurement parameters · CPC title