SDAP Control PDU Integrity Protection for QoS Mapping
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Solution Overview
Problem
Next-generation mobile communication systems face challenges in efficiently supporting multimedia telephony and dynamic Quality of Service (QoS) flow management, particularly in configuring and transmitting Service Data Access Protocol (SDAP) control PDUs to ensure accurate mapping between QoS flows and data radio bearers, which is crucial for reliable data transmission and service delivery.
Innovation Solution
The method involves generating and transmitting SDAP control PDUs with a QoS flow ID, concatenating a packet data convergence protocol (PDCP) header and message authentication code (MAC-I), and applying integrity protection to ensure secure and accurate mapping between QoS flows and data radio bearers, thereby supporting dynamic QoS flow management and in-order delivery in next-generation mobile communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SDAP control PDU is transmitted with integrity protection and PDCP header concatenation, then reliability and security of QoS flow mapping are improved, but device complexity and processing overhead increase
Solution Approach 1:
The SDAP control PDU is segmented into distinct functional components: PDCP header for structural identification, integrity protection fields for security verification, and QoS flow mapping information for data routing. This segmentation allows each component to be processed independently, improving reliability while managing complexity through modular handling of specific functions rather than monolithic processing
Solution Approach 2:
Integrity protection is applied preliminarily to the SDAP control PDU before transmission, and the PDCP header is concatenated in advance. This preliminary action ensures that reliability measures are built into the data structure before it enters the transmission pipeline, allowing receiving devices to verify integrity efficiently without adding complex real-time processing during data flow operations
2Adaptability or versatility
If dynamic QoS flow mapping is implemented with SDAP control PDU, then adaptability of network service is improved, but signaling overhead and processing time increase
Solution Approach 1:
The SDAP control PDU enables dynamic QoS flow mapping by allowing the mapping relationship between QoS flows and data radio bearers to be changed without establishing new radio bearers. The PDU structure supports real-time updates to mapping configurations, providing adaptability while reducing the time penalty associated with static, pre-configured mappings that would require complete re-establishment upon changes
Solution Approach 2:
The mapping control functionality is extracted from the radio bearer establishment process and placed into the SDAP control PDU mechanism. This extraction allows QoS flow mapping changes to be handled through lightweight control PDUs rather than through complex bearer re-establishment procedures, reducing processing time while maintaining dynamic adaptability
3Reliability
If integrity protection is applied to SDAP control PDU, then security and accuracy of mapping information are improved, but transmission overhead and processing load increase
Solution Approach 1:
Integrity protection is applied locally and selectively to the SDAP control PDU and its critical fields rather than to all data transmissions. The protection mechanism is concentrated where it is most needed - in the control information that directs QoS flow mapping - rather than being uniformly applied throughout the entire data stream, thus improving mapping integrity while minimizing overall transmission overhead
Data Source
AI summary
Disclosed are a communication scheme and a system thereof for converging an IoT technology and a 5G communication system for supporting a high data transmission rate beyond that of a 4G system. The disclosure can be applied to intelligent services (for example, services related to a smart home, smart building, smart city, smart car, connected car, health care digital education, retail business, security, and safety) based on the 5G communication technology and the IoT-related technology. Disclosed are a method and an apparatus for supporting a multimedia telephony (MMTEL) system, a method and an apparatus for efficiently operating a new QoS layer (service data access protocol (SDAP)), and a method and an apparatus for efficiently supporting a bandwidth part in the SCell in carrier aggregation or in dual connectivity.