Air Interface Key Update During SRNC Relocation
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Solution Overview
Problem
In the HSPA+ network, static SRNC relocation triggered by cell updates or URA updates can lead to prolonged relocation times and increased UE disconnection risks due to fast user equipment movement.
Innovation Solution
The method involves performing the relocation from the source RNC to the target RNC first, followed by intra-relocation of the target RNC, where the enhanced air interface key is updated during the intra-relocation process, thereby avoiding prolonged relocation times and disconnection risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If enhanced air interface key update is performed during static SRNC relocation, then security is improved, but relocation time increases
Solution Approach 1:
The source RNC performs key update in advance before handing over the UE to the target RNC. The source RNC updates the enhanced air interface key using the deformation intermediate key, and stores the updated key for subsequent use during the relocation process, thereby avoiding time-consuming key updates at the target RNC
Solution Approach 2:
The key update process is separated from the relocation execution process. The key update is performed as a preliminary action by the source RNC, while the target RNC directly uses the transferred key information, dividing the overall process into independent stages that can be executed efficiently
2Speed
If static SRNC relocation is performed for fast moving UE, then mobility support is improved, but UE disconnection risk increases
Solution Approach 1:
The source RNC completes key update and prepares all necessary security parameters before initiating the handover to target RNC. This preliminary preparation ensures that the target RNC receives complete key information in advance, enabling seamless continuation of secure communication without interruption
Solution Approach 2:
The target RNC receives the deformation intermediate key and updated enhanced air interface key from the source RNC through standardized interface signaling. This feedback mechanism ensures that the target RNC has the correct key material to maintain security while supporting fast UE movement
Data Source
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AI summary
The disclosure discloses a method for updating and generating an air interface key and a radio access system. The updating method comprises: a source Radio Network Controller (RNC) completes the static relocation towards a target RNC; the target RNC performs intra-Serving-RNC (SRNC) relocation; during the intra-SRNC relocation, the target RNC updates enhanced key of itself according to a key received from the source RNC or a core network node. With the disclosure, the enhanced air interface key can be updated during the SRNC static relocation process without increasing the time delay of the SRNC relocation, and security and efficiency of the system are improved.