Buffer Status Reporting for PDCP Duplication in 5G Uplink
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Solution Overview
Problem
There is no effective buffer state reporting method for systems that introduce Packet Data Convergence Protocol (PDCP) layer data packet duplication in next-generation mobile communication networks, particularly in 5G, which hinders accurate resource allocation and reliability in uplink data transmission.
Innovation Solution
A buffer state reporting method where a user equipment (UE) determines and reports buffer state information to a network side device based on triggering conditions, including configuration or deconfiguration of data packet duplication mode and buffer state differences, using specific Media Access Control Control Elements (MAC CE) to differentiate between bearers with and without data packet duplication mode, allowing for accurate scheduling of logical channels on different carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCP layer data packet duplication is introduced to support high-reliability and low-latency service transmission, then reliability and latency performance are improved, but there is no buffer state reporting method available for such systems
Solution Approach 1:
The patent segments the buffer state reporting by separating logical channels into different groups based on their duplication status. Type 1 logical channels (with duplication) are reported separately from Type 2 logical channels (without duplication), allowing the system to maintain reliability through duplication while managing reporting complexity through structured segmentation.
Solution Approach 2:
The patent applies local quality by configuring different buffer state reporting mechanisms for different logical channels based on their specific requirements. Logical channels with data packet duplication enabled receive specialized reporting treatment (Type 1 BSR) while those without duplication use standard reporting (Type 2 BSR), optimizing the system for local conditions.
2Measurement precision
If buffer state information of multiple logical channels corresponding to the same bearer is reported separately, then resource allocation accuracy is improved, but reporting overhead and processing complexity increase
Solution Approach 1:
The patent merges the reporting of multiple logical channels into consolidated Buffer Status Reports. Type 1 BSR aggregates buffer status information from all Type 1 logical channels, and Type 2 BSR aggregates from Type 2 logical channels, reducing the quantity of separate reports while maintaining precise resource allocation through the structured aggregation approach.
3Productivity
If the network side device schedules uplink resources based on detailed buffer state information, then uplink resource allocation efficiency is improved, but the complexity of buffer state reporting and processing increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring logical channels as either Type 1 or Type 2 based on whether data packet duplication is enabled. This classification is established in advance through RRC configuration, allowing the network side device to efficiently process buffer state reports without complex real-time analysis, thereby improving uplink resource allocation efficiency while managing processing complexity.
Data Source
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AI summary
A buffer state reporting method, a UE, a method of processing a buffer state report and a network side device are provided. The buffer state reporting method includes: determining, by the UE, whether a buffer state reporting triggering condition is met; and reporting, by the UE, buffer state information to a network side device if the buffer state reporting triggering condition is met, wherein buffer state information of a plurality of logical channels corresponding to a same bearer for which a data packet duplication mode is configured/activated are reported separately.