Radio Bearer Mapping by PDU Importance Within QoS Flows
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The degree of importance of Protocol Data Units (PDUs) is not reflected in the mapping to radio bearers, as the mapping is currently performed on a Quality of Service (QoS) flow basis, which does not account for the varying importance of PDUs within the same flow.
Innovation Solution
A radio base station and terminal that map data units to radio bearers based on the configured degree of importance, using sub-QoS Flow Identifiers (sub QFIs) to differentiate the importance of PDUs within the same QoS flow, and manage resource allocation and discarding of PDUs accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If mapping is performed on a QoS flow basis, then the mapping process is simple, but the degree of importance of PDUs is not reflected in the mapping to radio bearers
Solution Approach 1:
The QoS flow is segmented into multiple sub-flows based on PDU importance levels. Each sub-flow is identified by a sub-QFI (sub-QoS Flow Identifier) that indicates the degree of importance. This segmentation allows the mapping process to differentiate between PDUs of different importance while maintaining the overall QoS flow structure, thus preserving PDU importance information without excessive complexity.
Solution Approach 2:
Different mapping rules are applied to different sub-flows within the same QoS flow based on their local quality characteristics (importance levels). High-importance PDUs are mapped to radio bearers with higher reliability, while low-importance PDUs are mapped to radio bearers that can tolerate higher error rates. This local quality differentiation ensures that PDU importance is reflected in the mapping while keeping the overall system manageable.
2Ease of manufacture
If all PDUs in the same QoS flow are treated equally, then resource allocation is straightforward, but resource usage efficiency is reduced due to unnecessary retransmissions of low-importance PDUs
Solution Approach 1:
The system changes the parameter of PDU classification by introducing sub-QFIs that indicate different importance levels within a QoS flow. Based on these parameter changes, different resource allocation strategies are applied: high-importance PDUs receive more robust resource allocation with higher retransmission priority, while low-importance PDUs receive simpler allocation with lower retransmission priority. This parameter-based differentiation improves resource usage efficiency by avoiding unnecessary retransmissions of low-importance data while maintaining allocation simplicity through standardized procedures.
3Adaptability or versatility
If sub QFIs are configured for PDUs, then the degree of importance is differentiated, but the complexity of data unit management increases
Solution Approach 1:
The system adds another dimension to QoS flow management by introducing sub-QFIs as a secondary identification layer within each QoS flow. This dimensional expansion allows PDUs to be differentiated by importance level without fundamentally changing the existing QoS flow management structure. The sub-QFI acts as an additional attribute that enables importance-based differentiation while building upon the established QoS framework, thus achieving adaptability with controlled complexity.
Data Source
AI summary
A radio base station includes: a transmission and reception unit that transmits and receives a data unit to and from a terminal via a plurality of radio bearers; and a control unit that maps the data unit to any of the plurality of radio bearers based on the degree of importance configured to the data unit.