Uplink Buffer Status Report Priority Handling in Mobile Communication Devices
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Solution Overview
Problem
Existing communication systems face challenges in achieving low-latency data transmission, particularly when terminal devices perform mobility operations, leading to delayed uplink data transmission due to canceled or skipped buffer status reports (BSRs).
Innovation Solution
A communication device and method that prioritize uplink data transmission by preferentially sending BSRs linked with uplink data to the base station over mobility operations, even during mobility-related activities, ensuring timely allocation of uplink scheduling grants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device prioritizes mobility operations (measurement operations for frequency other than serving cell frequency), then the mobility operation can be performed without interruption, but the transmission of buffer status report (BSR) is canceled and uplink data transmission is delayed
Solution Approach 1:
The patent introduces dynamic priority adjustment for BSR transmission based on service requirements. When URLLC data is detected in the buffer, the BSR transmission priority is dynamically elevated above mobility operations, allowing the system to adaptively switch between mobility reliability and uplink transmission timeliness based on real-time traffic conditions
Solution Approach 2:
The patent changes the priority parameter of BSR transmission from a static low priority (below mobility operations) to a dynamic high priority (above mobility operations) when URLLC data is present. This parameter change enables the system to resolve the contradiction by adjusting the scheduling priority based on the type of data in the buffer
2Loss of time
If the terminal device transmits BSR concerning URLLC data with high priority, then uplink data transmission delay is reduced, but transmission of BSR concerning eMBB data may be delayed or canceled
Solution Approach 1:
The patent segments the BSR transmission mechanism into priority-based categories. By associating different priority levels with different data types (URLLC vs. eMBB), the system can selectively prioritize BSR transmission based on the specific data type present, ensuring that only critical URLLC data triggers high-priority BSR transmission while eMBB data maintains normal scheduling
3Loss of time
If the terminal device continuously transmits BSR to ensure low latency, then uplink data transmission delay is minimized, but system complexity and signaling overhead increase
Solution Approach 1:
Instead of continuous BSR transmission, the patent applies partial action by triggering BSR transmission only when specific conditions are met (URLLC data detected in buffer). This selective approach reduces unnecessary signaling overhead and MAC layer complexity while still achieving low latency for critical URLLC data
Data Source
AI summary
A communication device includes a transmission unit that, when priority of uplink data is predetermined priority, preferentially over an operation concerning mobility, transmits a buffer status report linked with the uplink data to a base station and a reception unit that receives, from the base station, an uplink scheduling grant corresponding to the buffer status report.