Partial Buffer Status Reporting for Congested 5G NR Uplinks
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Solution Overview
Problem
Existing 5G NR systems face challenges in efficiently managing uplink traffic for diverse quality-of-service classes like URLLC and eMBB, particularly in optimizing resource allocation and reducing power consumption for blind decoding of PDCCH channels.
Innovation Solution
User equipment analyzes buffered uplink traffic based on logical channel group criteria to generate partial buffer status reports, excluding non-relevant information, and transmits these reports to the radio access network, receiving grants for optimized resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If full buffer status reports are transmitted for all logical channel groups, then complete traffic information is provided to the network, but signaling overhead and power consumption increase
Solution Approach 1:
The patent segments the buffer status reporting by dividing logical channel groups into separate reportable entities. Instead of reporting all LCGs uniformly, the system segments reporting to include only those LCGs that satisfy specific criteria (buffer threshold, delay threshold, or both), thereby reducing overall signaling while maintaining necessary information completeness.
Solution Approach 2:
The patent applies partial action by transmitting only the necessary subset of buffer status information rather than complete information for all LCGs. The network receives partial reports containing only LCGs meeting the reporting criteria, which reduces signaling overhead and power consumption while still providing sufficient information for resource allocation decisions.
2Speed
If buffer status reports are transmitted frequently, then resource allocation responsiveness is improved, but signaling overhead increases
Solution Approach 1:
The patent introduces dynamic reporting behavior where the UE adaptively determines whether to transmit buffer status reports based on current traffic conditions and QoS requirements. The reporting frequency and content dynamically adjust according to which LCGs satisfy the reporting criteria at each moment, optimizing the balance between responsiveness and signaling overhead.
Solution Approach 2:
The patent changes the reporting parameters (which LCGs are reported) based on buffer thresholds and delay thresholds. By dynamically adjusting which LCGs meet the reporting criteria through parameter comparison, the system achieves responsive resource allocation only when necessary, reducing unnecessary signaling transmissions.
3Loss of energy
If partial buffer status reports are used, then signaling overhead is reduced, but information completeness may be compromised
Solution Approach 1:
The patent implements a feedback mechanism where the network receives partial buffer status reports and uses this information to make resource allocation decisions. The feedback loop ensures that even with partial information, the network can appropriately allocate resources for the reported LCGs, maintaining system efficiency while reducing signaling overhead.
Data Source
AI summary
A user equipment may be configured to transmit to a radio network node a partial buffer status report to minimize use of uplink resources for transmission of control information. A partial buffer status report may comprise one or more volume index/indices indicative of buffered traffic volume corresponding to one or more logical channel group(s), individually with respect to which buffered traffic corresponding to a logical channel group satisfies a partial buffer status report reporting criterion. A partial buffer status report may avoid indicating buffered traffic volume corresponding to a logical channel group with respect to which buffered traffic does not satisfy a partial buffer status report reporting criterion. A partial buffer status report reporting criterion may be a volume criterion or a delay criterion. During a period of uplink channel congestion, the user equipment may avoid transmitting a full buffer status report.