Buffer Status Reporting in Dual Connectivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems lack a method to realize dual connectivities between user equipment (UE) and both conventional and small cells, leading to delays in buffer status reporting (BSR) between eNodeBs.
Innovation Solution
The UE triggers separate buffer status reports for each connectivity as uplink data becomes available, allowing for efficient reporting and reducing delay in the existing BSR mechanism by identifying and reporting data through the appropriate connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE uses a single buffer status report mechanism for multiple connectivities, then the system complexity is reduced, but the delay in reporting buffer status increases
Solution Approach 1:
The patent segments the buffer status reporting mechanism by introducing separate BSR procedures for different connectivity types (intra-eNB and inter-eNB). The MAC entity is divided into multiple MAC entities, each responsible for specific connectivity, allowing parallel and independent BSR reporting for each connectivity type, thus reducing reporting delay while maintaining manageable complexity through structured organization.
2Loss of time
If the UE triggers separate buffer status reports for each connectivity, then the BSR reporting delay is reduced, but the device complexity increases
Solution Approach 1:
The patent implements a universal BSR triggering mechanism that operates across multiple MAC entities and connectivity types. The same BSR triggering conditions and procedures are applied universally to both intra-eNB and inter-eNB connectivities, allowing the system to achieve reduced reporting delay through parallel reporting while avoiding excessive complexity by reusing existing BSR logic across different contexts.
3Ease of operation
If the existing single connectivity BSR mechanism is used, then the ease of operation is maintained, but the productivity of uplink data transmission decreases
Solution Approach 1:
The patent introduces dynamic connectivity identification within the BSR triggering process. When uplink data becomes available, the UE dynamically identifies which connectivity (intra-eNB or inter-eNB) the data belongs to and triggers the appropriate BSR procedure accordingly. This dynamic approach maintains ease of operation by automatically selecting the correct reporting path while significantly improving uplink transmission productivity through parallel processing of multiple connectivity types.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
There is provided a method for reporting buffer status. The method may comprise: establishing a first MAC entity for a first eNodeB and a second MAC entity for a second eNodeB; identifying the first MAC entity on which an uplink data is to be transmitted among the first and second MAC entities, if the uplink data becomes available to be transmitted; and triggering a buffer status report (BSR) for the first MAC entity.