Patent · US Active

UE-specific methods for NR/LTE/3G/2G call performance improvement during IRAT re-selection procedure

US12309865B2 · kind B2 · utility

0Cited by

2References

20Claims

0Family size

Assignee

Apple Inc. · US

Inventors

Ashish Singh · Munich, DE
Anshul Gupta · Kanchinakote, IN
Franz Goldhofer · Schaftlach, DE
Pradeep Pangi · Bengaluru, IN
Mark Jeffery · Berkeley, US
Avinash Venugopal · San Diego, US

Key dates

Filing date	Aug 31, 2022
Grant date	May 20, 2025
Priority date	—
Expiry date	Apr 28, 2043

Classification

Technology area (CPC H)Electricity
CPC primaryH04W88/06
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

Methods, apparatuses, and systems are disclosed for reducing latency during IRAT re-selection in the presence of race conditions. When a UE initiates an IRAT re-selection procedure, and concurrently initiates a call setup procedure, a race condition may result, in which the UE's NAS layer prioritizes the call setup procedure, while the RRC layer prioritizes the IRAT re-selection procedure. This may result in failure of the call setup procedure, which may lead to a user needing to re-initiate the call, resulting in poor user experience and significant latency. To prevent this, the UE may cache a message and/or other information relevant to the call setup procedure, until the IRAT re-selection procedure is complete. The UE may then proceed to complete the call setup procedure. The message may be cached, e.g., at the NAS layer or the RRC layer of the cellular modem, or by an application processor.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.