SDAP Entity Flow Identifier Tagging for 5G QoS Control
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Solution Overview
Problem
In 5G communication systems, there is a need to effectively implement interaction between the upper layer, Service Data Adaptation Protocol (SDAP) entity, and Packet Data Convergence Protocol (PDCP) entity, particularly in managing network slices, flows, and Protocol Data Unit (PDU) sessions, due to the complexity of QoS control and data transmission across different network slices.
Innovation Solution
A data transmission method that involves transmitting data packets with flow identifiers from the upper layer to the SDAP entity, which adds the flow identifier and transmits them to the PDCP entity corresponding to a Data Radio Bearer (DRB), and receiving data packets with flow identifiers to forward them to the appropriate network slice, flow, or PDU session, ensuring accurate interaction among entities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If QoS indication information is added at the PDCP layer for 5G network slice management, then data transmission accuracy and QoS control capability are improved, but protocol complexity and processing overhead increase
Solution Approach 1:
The patent segments the QoS management function by introducing a new SDAP layer between the upper layer and PDCP layer. This segmentation allows the SDAP layer to handle QoS indication information (such as QoS flow IDs) separately, improving data transmission accuracy for network slice management while isolating the complexity to a specific protocol layer rather than increasing overall system complexity
Solution Approach 2:
The SDAP entity acts as an intermediary layer that mediates between the upper layer and PDCP entity. It adds QoS indication information to data packets and transmits them to the corresponding PDCP entity, enabling precise QoS control without requiring the PDCP layer itself to become more complex. The intermediary handles the complexity of QoS management while keeping the PDCP layer's functionality relatively simple
2Adaptability or versatility
If multiple QoS parameters and flow identifiers are managed across network slices, then QoS control capability is improved, but interaction complexity among upper layer, SDAP entity and PDCP entity increases
Solution Approach 1:
The patent segments the data transmission process into distinct stages: the upper layer generates QoS indication information, the SDAP layer adds and manages flow identifiers, and the PDCP layer processes the tagged packets. This segmentation allows each entity to focus on specific QoS parameters, improving overall QoS control capability while reducing interaction complexity through clear interface definitions
Solution Approach 2:
The SDAP entity performs preliminary action by adding QoS indication information and flow identifiers to data packets before transmitting them to the PDCP entity. This preliminary tagging enables the PDCP entity to efficiently handle multiple QoS parameters without complex real-time interactions, as the QoS management information is prepared in advance
Data Source
AI summary
The present disclosure provides a data transmission method, related devices and system. The method includes: an upper layer transmits a data packet to a corresponding Service Data Adaptation Protocol (SDAP) entity, according to at least one of a network slice identifier, an SDAP identifier, a flow identifier or a session identifier; the SDAP entity adds the flow identifier to the data packet, and transmits the data packet with the flow identifier to a Packet Data Convergence Protocol (PDCP) entity corresponding to a Data Radio Bearer (DRB), according to a corresponding relationship between the SDAP entity and the DRB.