Dynamic BSR Table Selection for Accurate Uplink Scheduling
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Solution Overview
Problem
Existing buffer status reporting (BSR) mechanisms in 5G NR systems suffer from inefficiencies due to non-uniform quantization step sizes, leading to over- or under-allocation of uplink resources, especially in latency and capacity-demanding use cases like URLLC, resulting in extended scheduling latency and degraded network capacity.
Innovation Solution
A user equipment (UE) is configured with multiple buffer status report tables and selects the optimal table to minimize the number of transmissions based on uplink resource underscheduling, using dynamic buffer status reporting to adaptively indicate the exact amount of buffered traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-uniform quantization step sizes are used in buffer status reporting, then the number of BSR transmissions is reduced, but resource allocation accuracy deteriorates leading to over- or under-allocation of uplink resources
Solution Approach 1:
The patent applies dynamics by making the quantization step size adaptive rather than fixed. The gNB configures multiple BSR tables with different uniform quantization step sizes and the UE dynamically selects the appropriate table based on current buffer status and network conditions. This dynamic adaptation allows the system to use coarser quantization when appropriate (reducing transmissions) while maintaining fine quantization when precision is needed (improving allocation accuracy).
Solution Approach 2:
The patent changes the quantization parameter (step size) based on different operating conditions. By configuring multiple BSR tables with different uniform quantization step sizes and allowing the UE to select among them, the system can adjust the quantization granularity to match the current traffic pattern and network state, thereby optimizing both transmission frequency and allocation accuracy for different scenarios.
2Measurement precision
If multiple buffer status report tables with different uniform quantization step sizes are configured, then resource allocation accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the buffer status reporting into multiple standardized tables, each with uniform quantization step sizes. This segmentation allows the UE to select from pre-defined tables rather than performing complex dynamic quantization calculations. The segmentation into discrete, manageable tables reduces processing complexity while maintaining the ability to achieve accurate resource allocation through appropriate table selection.
Solution Approach 2:
The patent manages device complexity by changing quantization parameters through table selection rather than through complex real-time calculations. The UE stores multiple BSR tables with different uniform quantization step sizes and selects the appropriate table based on buffer status thresholds and network feedback, thereby achieving adaptive precision without requiring complex quantization algorithms in the UE.
3Device complexity
If uniform quantization step sizes are used across all buffer status ranges, then device complexity is reduced, but spectral efficiency deteriorates due to extended scheduling latency
Solution Approach 1:
The patent introduces dynamics by enabling the UE to switch between different BSR tables with different uniform quantization step sizes based on current buffer status conditions. This dynamic table selection allows the system to use finer quantization (improving spectral efficiency) when buffer status requires it, while using coarser quantization (reducing complexity) when appropriate, thereby optimizing spectral efficiency without requiring complex real-time quantization algorithms.
Data Source
AI summary
A radio access network node may configure a user equipment with multiple buffer status report tables. The node may transmit to the user equipment a buffer status reporting configuration comprising an indication of one or more of the configured tables that have been activated for use by the user equipment to generate buffer status reports. If the buffer status reporting configuration indicates that the node is implementing underscheduling of uplink resources in response to buffer status reports, the user equipment may select one or more of the activated configured tables that may result in a fewest number of transmissions of buffer status reports to obtain uplink resources to facilitate transmission of buffered traffic. The user equipment may transmit to the node one or more buffer status reports that each comprise a traffic volume index and a table indication indicative of a selected table corresponding to the traffic volume index.