SDAP Entity Establishment for NR QoS Flow Mapping
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Solution Overview
Problem
Inefficient communication between a base station apparatus and a terminal apparatus due to incorrect Quality of Service (QoS) management between the radio access layer and upper layers, such as the Internet Protocol (IP) layer, in the context of NR radio access technology.
Innovation Solution
A terminal apparatus and method that simplifies protocol processing by establishing an SDAP entity for efficient communication, including configuring and managing radio bearers and quality of service flows, and ensuring proper mapping between QoS flows and radio bearers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If QoS management between upper layer and radio access layer is performed with detailed protocol processing, then communication efficiency is improved, but device complexity increases
Solution Approach 1:
The patent extracts and separates QoS flow identification and mapping functions into a dedicated SDAP layer, isolating complex QoS management logic from the upper IP layer and radio access layer. This extraction allows each layer to focus on its core functions while the SDAP layer handles QoS flow mapping, thereby improving communication efficiency without significantly increasing overall system complexity.
Solution Approach 2:
The SDAP (Service Data Adaptation Protocol) layer acts as an intermediary between the upper IP layer and the radio access layer. It provides QoS flow mapping and management functions, serving as a mediator that translates between different protocol layers and ensures proper QoS handling without requiring complex interactions between the IP layer and radio access layer directly.
2Reliability
If SDAP entity management is implemented with proper establishment and release procedures, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements preliminary establishment procedures for SDAP entities before data transmission begins. The SDAP entity is established in advance with proper configuration of QoS flow mappings, ensuring that reliable QoS management is in place before communication starts. This preliminary setup improves communication reliability while keeping management complexity manageable through standardized establishment procedures.
Solution Approach 2:
The patent incorporates feedback mechanisms where the terminal apparatus reports SDAP entity status and QoS flow mapping information to the base station. This feedback enables the network to monitor and manage SDAP entities effectively, ensuring reliable communication while maintaining manageable complexity through automated status reporting and control.
Data Source
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AI summary
A terminal apparatus includes: a reception unit configured to receive an RRC reconfiguration message including a DRB configuration and a processing unit, wherein the processing unit establishes an SDAP entity based on conditions that a DRB identity included in the DRB configuration is not part of a configuration of the terminal apparatus, an SDAP configuration is included in the DRB configuration, and an SDAP entity corresponding to a PDU session information element included in the SDAP configuration does not exist, and indicates establishment of a user-plane resource for a PDU session to an upper layer based on an additional condition that the SDAP entity corresponding to the PDU session information element does not exist before the RRC reconfiguration message is received.