Baseband Caching of SIM Files

摘要

This disclosure relates to caching SIM files at a baseband processor to reduce cellular bootup time. According to one embodiment, a wireless device may read SIM files from a SIM and store a local copy of each file in a cache of the baseband processor of the wireless device. SIM identification information for the SIM from which the cached files were read may be associated with the cache. Indicator information usable for comparing file versions may also be generated and stored in the cache for each file. Upon a subsequent SIM initialization, the wireless device may read SIM files from the cache instead of from the initialized SIM if the cached version is identical to the SIM version, which may be determined based at least in part on the SIM identification information and the indicator information for such files.

主权项

1. A wireless user equipment (UE) device, comprising:
a radio; and a processing element operably coupled to the radio; wherein the radio and the processing element are configured to:
initialize a subscriber identity module (SIM);request indicator information from the SIM for each of one or more types of files stored on the SIM;receive indicator information from the SIM for at least a subset of each of the requested one or more types of files stored on the SIM;compare the received indicator information with indicator information stored in a cache of a baseband processor of the UE for each respective file type for which indicator information is received from the SIM; andbased on each comparison:
determine whether a file of the respective type stored on the SIM is or is not identical to a file of the respective type stored in the cache;read the file of the respective type from the cache if the file of the respective type stored on the SIM is identical to the file of the respective type stored in the cache; andread the file of the respective type from the SIM if the file of the respective type stored on the SIM is not identical to the file of the respective type stored in the cache.