Buffer Status Report Configuration for Dual Connectivity
Solution Overview
Problem
In dual connectivity wireless communication systems, the current buffer status report (BSR) method inaccurately reports buffer sizes for split radio bearers, leading to double counting of PDCP buffer size and inefficient uplink resource allocation, resulting in resource wastage.
Innovation Solution
A method for calculating and reporting buffer status in dual connectivity, where the user equipment receives a BSR configuration from the master and secondary eNBs, allowing it to calculate separate buffer sizes for each eNB, ensuring accurate reporting by mapping logical channels to split radio bearers and using specific calculation schemes to avoid double counting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If both MAC entities M-MAC and S-MAC send BSRs for their respective logical channels of a split radio bearer, then each eNB receives buffer status information, but the PDCP buffer size is double counted leading to inaccurate resource allocation
Solution Approach 1:
The patent segments the buffer status reporting by introducing a configuration parameter that divides the split radio bearer's logical channels into different groups. Each MAC entity (M-MAC and S-MAC) is configured to report BSR for specific logical channel groups only, preventing double counting of the PDCP buffer size while ensuring both eNBs receive necessary buffer status information for accurate resource allocation.
2Productivity
If the UE reports buffer size for split radio bearers to both MeNB and SeNB, then both eNBs can allocate uplink resources, but the reported buffer size exceeds the real uplink data amount causing inefficient resource allocation
Solution Approach 1:
The patent applies local quality by configuring different BSR reporting behaviors for different logical channel groups associated with the same split radio bearer. Each MAC entity is assigned specific logical channel groups to report based on local configuration parameters, ensuring that the buffer size information reported to each eNB is accurate and tailored to that eNB's resource allocation needs, rather than uniformly reporting the entire PDCP buffer size to both eNBs.
Data Source
AI summary
A method for buffer status report (BSR) in dual connectivity for a communication device in a wireless communication system is disclosed. The method comprises connecting to at least two base stations including a first base station and a second base station in the wireless communication system, receiving a BSR configuration from the first base station, wherein the BSR configuration indicates a calculation scheme for a BSR, and calculating buffer sizes indicated in a first BSR and a second BSR respectively for the first base station and the second base station according to the calculation scheme in the received BSR configuration, wherein at least a first logical channel of a first logical channel group reported by the first BSR and at least a second logical channel of a second logical channel group reported by the second BSR are mapped to the same split radio bearer.