PDCP COUNT Status Indication for Multicast Security
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Solution Overview
Problem
Conventional communication technologies lack effective security mechanisms for multicast transmission at the PDCP layer, leading to relatively low security for multicast services in both Uu and sidelink interfaces.
Innovation Solution
The method involves transmitting and receiving PDCP COUNT information, which includes PDCP COUNT value, PDCP HFN value, or SN value, to enable secure multicast service status indication, allowing for decryption, integrity verification, and synchronization of data packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a security mechanism is enabled at the PDCP layer for multicast transmission, then transmission security is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by enabling the PDCP layer security mechanism to serve multiple functions: it provides encryption for confidentiality, integrity verification for data authenticity, and status variable synchronization for reliable delivery. This single security framework addresses multiple security requirements simultaneously, improving transmission security without proportionally increasing device complexity.
Solution Approach 2:
The patent utilizes parameter changes by introducing status variables (COUNT, HFN, SN) that track the security state of multicast transmissions. By dynamically managing these parameters at the PDCP layer, the system achieves robust security through mathematical transformations and state tracking rather than complex hardware security modules, thus improving security while controlling complexity.
2Measurement precision
If PDCP COUNT information is transmitted for multicast services, then synchronization accuracy is improved, but information overhead increases
Solution Approach 1:
The patent applies segmentation by dividing the PDCP COUNT into separate components: HFN (Hyper Frame Number) and SN (Sequence Number). This segmentation allows the system to transmit only the necessary portions of the COUNT value for synchronization, improving accuracy while minimizing overhead. The HFN and SN can be transmitted separately or selectively based on synchronization needs.
Solution Approach 2:
The patent implements partial action by transmitting PDCP COUNT information selectively rather than continuously. The status variables are updated and transmitted only when necessary for synchronization, such as when the receiving side needs to resynchronize or when the transmitting side detects a synchronization issue. This reduces information overhead while maintaining synchronization accuracy.
Data Source
AI summary
An indication method for a status variable of a multicast service includes a transmitting side sends PDCP COUNT information to a receiving side. The PDCP COUNT information includes at least a PDCP COUNT value, a PDCP HFN value, or an SN value.