Method of handling security configuration in wireless communications system and related communication device
AssigneeHTC Corporation
InventorChih-Hsiang Wu
Life of this patent
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Abstract
A method of handling security configuration for a mobile device using a mapped security context in a wireless communication system includes utilizing the mapped security context to derive ciphering and integrity keys when security configuration, indicating a key update based on a cached security context, is received.
Claims6
A method of handling security configuration for a mobile device in a wireless communication system during an intra-long term evolution (LTE) handover or a radio resource control (RRC) connection re-establishment procedure, after an inter-system handover from universal mobile telecommunications system (UMTS) to LTE, the method comprising:
- utilizing a mapped security context generated in response to the inter-system handover to derive ciphering and integrity keys when security configuration is received via the intra-LTE handover or when a RRCConnectionReestablishment message is received during the RRC connection re-establishment procedure;
- wherein the security configuration comprises a keyChangeIndicator information element set to a FALSE value and is included in a handover command for the intra-LTE handover.
A communication device of a wireless communication system for accurately handling security configuration during an intra-long term evolution (LTE) handover or a radio resource control (RRC) connection re-establishment procedure, after an inter-system handover from universal mobile telecommunications system (UMTS) to LTE, the communication device comprising:
- a computer readable recording medium for storing mapped security context, cached security context, and program code corresponding to a process, wherein the mapped security context is generated in response to the inter-system handover;
- and
- a processor coupled to the computer readable recording medium, for processing the program code to execute the process;
- wherein the process comprises:
- utilizing the mapped security context to derive ciphering and integrity keys when the mapped security context is in use and when security configuration is received via the intra-LTE handover or a RRCConnectionReestablishment message is received during the RRC connection re-establishment procedure;
- wherein the security configuration comprises a keyChangeIndicator information element set to a FALSE value and is included in a handover command for the intra-LTE handover.
Dependencies are inferred from the claim text.