Selective Buffer Status Reporting for Multi-Scheduler Wireless Networks
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Solution Overview
Problem
In LTE systems with inter-base station carrier aggregation, the existing Buffer Status Report (BSR) mechanism is inadequate for effectively communicating and managing buffer status information across multiple schedulers, leading to inefficiencies and potential radio resource over-allocation due to outdated information.
Innovation Solution
The UE calculates and selectively reports buffer status values to one or more base stations, using joint, separate, or hybrid BSR configurations, and triggers budget BSR reports based on predefined criteria to ensure timely and accurate resource allocation across multiple schedulers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE reports buffer status to only one serving base station traditionally, then the system maintains simple architecture and operation, but the mechanism becomes inadequate for inter-base station carrier aggregation where multiple schedulers need buffer status information
Solution Approach 1:
The patent implements dynamic BSR reporting where the UE selectively reports buffer status to one or more base stations based on real-time conditions. The UE determines whether to report to a single serving eNB or multiple eNBs in an inter-eNB CA scenario, allowing the system to adapt between simple and complex reporting modes depending on the carrier aggregation configuration.
Solution Approach 2:
The patent segments the BSR reporting process into different modes: reporting to a single serving eNB for traditional scenarios, and reporting to multiple eNBs for inter-eNB carrier aggregation scenarios. Each eNB receives buffer status information relevant to its scheduled carriers, allowing targeted information distribution rather than universal reporting.
2Measurement precision
If the UE sends separate BSR reports to multiple base stations in inter-eNB carrier aggregation, then each scheduler receives accurate buffer status information, but the signaling overhead and reporting frequency requirements increase
Solution Approach 1:
The patent applies local quality by sending different BSR reports to different eNBs based on their specific needs. Each eNB receives buffer status information tailored to the carriers it schedules, rather than all eNBs receiving identical comprehensive reports. This reduces redundant signaling while ensuring each scheduler has accurate local information.
Solution Approach 2:
The patent implements partial reporting where the UE sends buffer status information to only those eNBs that currently have scheduling relevance. The UE monitors which eNBs are actively scheduling its carriers and reports to those specific eNBs, avoiding unnecessary reporting to eNBs that are not currently scheduling the UE, thus reducing signaling overhead.
3Productivity
If the UE uses outdated buffer status information for scheduling decisions, then the signaling frequency is reduced, but radio resource over-allocation occurs leading to inefficiency
Solution Approach 1:
The patent implements feedback mechanisms where the UE continuously monitors buffer status and provides updates to eNBs when changes occur. The UE sends BSR reports triggered by buffer status changes, ensuring eNBs receive timely information about available uplink data. This feedback loop prevents resource over-allocation by keeping scheduling decisions based on current rather than outdated information.
Solution Approach 2:
The patent employs periodic BSR reporting where the UE sends buffer status information at regular intervals or when triggered by specific events such as buffer status changes. This periodic update mechanism ensures that eNBs receive fresh information without requiring continuous reporting, balancing information freshness with signaling overhead reduction.
Data Source
AI summary
Apparatus and method are provided to enhance buffer status report (BSR) to multiple schedulers with inter base station carrier aggregation. In one novel aspect, the UE calculates a buffer size value, detects a BSR trigger event, selects one or more base stations (BSs) to send the BSR reports and generates the BSR reports for the selected one or more BSs. In one embodiment, one BS is selected based on predefined criteria. In other embodiments, multiple base stations are selected. In one embodiment, the same contents for BSR are generated. In another embodiment, different BSR reports are generated for different base stations from which the UE receives UL grants. In one novel aspect, the UE calculates a buffer size value and determines if a budget BSR triggering criteria is satisfied. The UE triggers budget BSR procedure by sending a budget BSR report to a selected base station based on predefined thresholds.