SpCell L1/L2 Mobility Security Context Switching for Low Latency
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Solution Overview
Problem
Current security protocols during L1/L2 mobility in wireless communication systems, such as NR, lead to increased latency due to PDCP, RLC re-establishment, and MAC reset, which is undesirable for latency enhancement.
Innovation Solution
A wireless transmit/receive unit (WTRU) is configured to process data using multiple security contexts, transmitting and receiving data with the old context until specific conditions are met, and then switching to a new context, thereby avoiding re-establishment of PDCP, RLC, and MAC entities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCP, RLC re-establishment and MAC reset are performed during L1/L2 mobility, then security is maintained, but latency increases
Solution Approach 1:
The patent applies dynamics by making the security context switchable and adaptable during mobility. The WTRU dynamically switches between first and second security contexts based on whether the SpCell changes, allowing the system to adapt security measures to the specific mobility scenario rather than always performing full re-establishment procedures
Solution Approach 2:
The patent changes the security context parameter based on SpCell status. When SpCell changes, the WTRU switches to a second security context with new keys; when SpCell remains the same, it continues using the first security context. This parameter change approach avoids unnecessary re-establishment and reduces latency while maintaining appropriate security
2Reliability
If PDCP, RLC re-establishment and MAC reset are performed during L1/L2 mobility, then data integrity is ensured, but productivity decreases
Solution Approach 1:
The system dynamically adjusts the security handling based on SpCell changes. When SpCell changes, full re-establishment with new security context ensures data integrity; when SpCell remains same, the system maintains existing context for faster handover. This dynamic approach balances integrity and productivity
Solution Approach 2:
The patent changes security context parameters conditionally based on SpCell status. The WTRU monitors SpCell changes and switches between security contexts accordingly, avoiding unnecessary re-establishment procedures that would reduce handover speed while maintaining data integrity when required
3Reliability
If additional reconfiguration is stored and applied for L1/L2 mobility, then security updates are maintained, but device complexity increases
Solution Approach 1:
The patent makes configuration management dynamic by switching between two security contexts based on SpCell changes. The WTRU maintains a first security context for normal operation and a second security context for when SpCell changes, activating the appropriate context based on current conditions rather than managing complex reconfiguration for all scenarios
Data Source
AI summary
A wireless transmit/receive unit (WTRU) may be configured to process first downlink data from a source cell using a first security context. The WTRU may receive, from the source cell, configuration information indicating one or more candidate cells for Layer 1 or Layer 2 (L1/L2) triggered mobility (LTM). The WTRU may receive, from the source cell, a LTM indication to perform a handover (HO) to a candidate cell among the one or more candidate cells. The WTRU may determine a second security context associated with the candidate cell. The WTRU may process second downlink data based on the first security context. The WTRU may process third downlink data from the candidate cell using the second security context upon a determination that one or more of the conditions are met.