Wireless Communication ID Synchronization via MAC PDU Group Handling
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Solution Overview
Problem
In UE-UE communications, particularly in sidelink relay communications, the frequent update of user IDs is necessary for security, but traditional methods fail to ensure synchronous updating of IDs and parameters, leading to potential security risks and privacy issues, especially when relay nodes are involved.
Innovation Solution
A method where a first node receives a second MAC PDU group with old IDs and transmits a first MAC PDU group with updated IDs, ensuring that new IDs are used for both transmission and reception, and the PDCP PDU headers are updated accordingly to maintain security and privacy by using different key IDs for security algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user IDs are frequently updated for security in UE-UE communications, then security protection is improved, but synchronization between ID updates and parameter updates becomes difficult to maintain
Solution Approach 1:
The patent applies preliminary action by updating the PDCP entity parameters (including security parameters and identity) before the RLC entity parameters. This ensures that when data is transmitted, the security context is already aligned with the new identity, preventing the mixing of old and new parameters. The base station performs this preliminary update in the reconfiguration message, so the UE can seamlessly switch to the new identity without desynchronization.
Solution Approach 2:
The patent implements feedback through the reconfiguration complete message exchange. After the UE receives the reconfiguration message with updated identity and parameters, it sends a reconfiguration complete message back to the base station. This feedback mechanism ensures that both the base station and UE are aware of the successful update, maintaining synchronization. The base station can then proceed with confidence that the new identity is active on both ends.
2Duration of action of stationary object
If old parameters are used in data transmission after ID update, then data transmission continuity is maintained, but security risks increase due to mixing of old and new identities
Solution Approach 1:
The patent applies the taking out principle by extracting and separately handling old and new parameter sets. The base station explicitly indicates in the reconfiguration message which parameters are new and which are old, and the UE is instructed to use only the new parameters for subsequent data transmission. This separation prevents the mixing of old and new identities, eliminating the security vulnerability while maintaining transmission continuity through proper parameter inheritance.
Solution Approach 2:
The patent uses preliminary action by pre-configuring the new security parameters and identity in the reconfiguration message before data transmission begins. The UE applies these new parameters in advance, so when data transmission continues, it uses only the new, secure parameter set. This preliminary configuration ensures that no old parameters are inadvertently used, preventing security risks while maintaining seamless transmission.
3Reliability
If new IDs are immediately applied after update, then security is enhanced, but data transmission may be interrupted due to unsynchronized updates
Solution Approach 1:
The patent applies continuity of useful action by ensuring that the data transmission process continues uninterrupted during the ID update. The reconfiguration message includes all necessary new parameters in advance, allowing the UE to switch to the new identity without stopping data flow. The RLC entity continues to operate with the new parameters seamlessly, maintaining the continuity of useful action (data transmission) while enhancing security through the new identity.
Solution Approach 2:
The patent uses preliminary action by providing all new identity and parameter information in the reconfiguration message before data transmission needs to switch. The UE prepares the new security context in advance, so when the update takes effect, data transmission continues without interruption. This preliminary preparation eliminates the need to pause transmission for synchronization, maintaining continuous useful action while achieving security enhancement.
4Adaptability or versatility
If relay nodes are involved in UE-UE communications, then communication coverage is extended, but control over identity updating becomes less self-controlled
Solution Approach 1:
The patent applies the intermediary principle by using the base station as a mediator in the identity updating process for relay communications. Even though relay nodes extend coverage, the base station maintains control by sending reconfiguration messages that include the new identity and parameters. This intermediary role ensures that the identity update remains centralized and secure, preventing the relay node from arbitrarily changing identities, while still allowing the communication coverage extension to function.
Data Source
AI summary
Method and device used for wireless communications, including receiving a second media access control packet data unit (MAC PDU) group, a MAC Header of any MAC PDU in the second MAC PDU group comprising information corresponding to a first portion of a first old identifier (ID); the second MAC PDU group comprising a first packet data convergence protocol (PDCP) PDU, and a header of the first PDCP PDU comprising a first key ID; the first key ID being used to identify a first key, and the first key being used to generate a key for a security algorithm applied to the first PDCP PDU; transmitting a first MAC PDU group comprising a second PDCP PDU, the second PDCP PDU comprising information corresponding to a first portion of the first PDCP PDU; by determining a first key ID and a second key ID, reliability is improved, and risks during communications are avoided.