US 9,544,758 B2 · Baseband caching of SIM files

Abstract

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.

Claims20

Dependent claims

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 for a first file stored on the SIM;
receive the indicator information for the first file from the SIM;
compare the indicator information for the first file on the SIM with indicator information of a corresponding first file stored in a cache of the UE;
determine validity status for a second file stored in the cache of the UE that is dependent on the first file on the SIM, wherein determining the validity status for the second file is based on comparing the indicator information of the first file on the SIM with the indicator information of the corresponding first file stored in the cache of the UE;
read the second file from the cache if the second file is determined to be valid;
and
generate and store a new version of the second file in the cache of the UE if the second file is determined to be invalid.

9 more elements

An apparatus, comprising:

one or more processing elements, wherein the one or more processing elements are configured to:
initialize a subscriber identity module (SIM) of a user equipment (UE);
request indicator information for a first file stored on the SIM;
receive the indicator information for the first file from the SIM;
compare the indicator information for the first file on the SIM with indicator information of a corresponding first file stored in a cache of the UE;
determine validity status for a second file stored in the cache of the UE that is dependent on the first file on the SIM, wherein determining the validity status for the second file is based on comparing the indicator information of the first file on the SIM with the indicator information of the corresponding first file stored in the cache of the UE;
read the second file from the cache if the second file is determined to be valid;
and
generate and store a new version of the second file in the cache of the UE if the second file is determined to be invalid.

6 more elements

A method for a wireless user equipment (UE) device, the method comprising:

by the UE:
initializing a subscriber identity module (SIM);
requesting indicator information for a first file stored on the SIM;
receiving the indicator information for the first file from the SIM;
comparing the indicator information for the first file on the SIM with indicator information of a corresponding first file stored in a cache of the UE;
determining validity status for a second file stored in the cache of the UE that is dependent on the first file on the SIM, wherein determining the validity status for the second file is based on comparing the indicator information of the first file on the SIM with the indicator information of the corresponding first file stored in the cache of the UE;
reading the second file from the cache if the second file is determined to be valid;
and
generating and store a new version of the second file in the cache of the UE if the second file is determined to be invalid.

6 more elements

Dependencies are inferred from the claim text.

Baseband caching of SIM files

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Baseband caching of SIM files

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Abstract

Claims20