Sidelink Radio Bearer Mapping for QoS Flow Identification
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Solution Overview
Problem
In 5G NR V2X technology, there is a lack of clear methods for a receiving UE to remap a sidelink radio bearer (SLRB) to a QoS flow, especially in groupcast and broadcast scenarios, due to the allocation of QoS flow identifiers by the transmitting UE itself.
Innovation Solution
The proposed solution involves configuring index configuration information that quantizes QoS parameters and indexes them, allowing the network or BS to preconfigure the mapping relationship between PC5 QoS flows and SLRBs, and then transmitting this information to both the transmitting UE and receiving UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transmitting UE allocates QoS flow identifiers autonomously in groupcast and broadcast scenarios, then the flexibility and autonomy of the transmitting UE is improved, but the receiving UE cannot accurately identify or remap QoS flows due to lack of mapping information
Solution Approach 1:
The network preconfigures mapping relationships between QoS flow identifiers and SLRB configuration information before transmission. This preliminary configuration enables the receiving UE to accurately remap QoS flows without requiring real-time signaling, thus maintaining transmitting UE autonomy while preventing information loss.
Solution Approach 2:
The patent introduces SLRB configuration information as an intermediary that carries mapping relationships between QoS flow identifiers and bearer configurations. This intermediary structure allows the receiving UE to infer QoS flow mapping without direct signaling from the transmitting UE, resolving the contradiction between autonomy and information availability.
2Measurement precision
If detailed QoS parameter information is transmitted from transmitting UE to receiving UE, then accurate QoS flow identification is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential mapping relationship information (QoS flow identifier to SLRB configuration) from the complete QoS parameter set. By transmitting only this extracted mapping information rather than full QoS parameters, the system achieves accurate QoS flow identification while minimizing signaling overhead.
Solution Approach 2:
The patent transforms detailed QoS parameter information into a compact mapping relationship representation. By changing the parameter form from detailed QoS descriptors to concise mapping indices, the system maintains identification accuracy while reducing the quantity of transmitted information.
3Reliability
If preconfiguration of mapping relationships is performed by the network, then the receiving UE can accurately remap SLRB to QoS flow, but the device complexity and configuration management burden increase
Solution Approach 1:
The patent designs the SLRB configuration information structure to serve multiple functions simultaneously: it acts as both a bearer configuration and a QoS flow mapping indicator. This multi-functionality reduces the need for separate configuration mechanisms, thereby maintaining remapping accuracy while reducing overall system complexity.
Data Source
AI summary
Embodiments of the present application are related to a method and apparatus for indicating QoS flow information. A method according to an embodiment of the present application includes: mapping at least one data packet to a QoS flow, wherein the QoS flow is associated with a set of QoS parameters; mapping the QoS flow to a sidelink radio bearer (SLRB) based on index configuration information, wherein the index configuration information indicates a set of indexes associated with each QoS parameter of the set of QoS parameters; and transmitting configuration information of the SLRB and mapping index information, wherein the mapping index information indicates a quantization index of each QoS parameter of the set of QoS parameters, and the set of QoS parameters is quantified to the mapping index information based on the index configuration information.