MBS QoS Flow Mapping Across MRB and DRB for Reliable Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The reliability of Multicast and Broadcast Services (MBS) is poor due to the QoS flow being mapped only to the MBS Radio Bearer (MRB).
Innovation Solution
Mapping QoS flows of MBS to both MBS Radio Bearer (MRB) and Data Radio Bearer (DRB), with independent Packet Data Convergence Protocol (PDCP) and Radio Link Control (RLC) entities for each bearer, and utilizing a Service Data Adaptation Protocol (SDAP) layer for data packet delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If QoS flow of MBS is mapped only to MRB, then the structure is simple, but the reliability is poor
Solution Approach 1:
The patent segments the QoS flow mapping by introducing two separate mapping paths: one mapping QoS flows to MRB for multicast/broadcast transmission, and another mapping QoS flows to DRB for unicast transmission. This segmentation allows the system to utilize both transmission modes independently, improving reliability without requiring a completely new unified structure.
Solution Approach 2:
The patent changes the mapping parameter by allowing flexible configuration of which QoS flows are mapped to MRB and which are mapped to DRB. Through parameter adjustment (mapping configuration), the system can adapt to different reliability requirements and network conditions, resolving the contradiction between simple structure and high reliability.
2Reliability
If QoS flow is mapped to both MRB and DRB, then reliability improves, but device complexity increases
Solution Approach 1:
The patent makes the SDAP layer universal by enabling it to handle both MRB and DRB mappings through the same protocol stack. The SDAP entity can deliver data packets to either or both bearers based on configuration, eliminating the need for separate protocol stacks and reducing overall device complexity while maintaining dual-bearer reliability.
Solution Approach 2:
The patent merges the handling of MRB and DRB through a common SDAP layer and shared PDCP entities. By combining the control functions in the SDAP layer and reusing PDCP resources, the system achieves dual-bearer reliability without proportionally increasing protocol stack complexity.
3Reliability
If independent PDCP and RLC entities are used for each bearer, then transmission reliability improves, but resource consumption increases
Solution Approach 1:
The patent introduces dynamic resource sharing where PDCP entities can be dynamically allocated to either MRB or DRB based on transmission needs. The system can switch between using independent PDCP entities for each bearer and sharing PDCP entities between bearers, allowing flexible adjustment of resource consumption while maintaining transmission reliability.
Data Source
AI summary
A data flow transmission method, a terminal, and a network-side device are provided. The data flow transmission method includes: mapping QoS flows of an MBS to an MRB and a DRB; transmitting the QoS flows through at least one of the MRB or the DRB.