Priority-Based Uplink Scheduling in LTE Mobile Terminals
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Solution Overview
Problem
Current LTE systems face issues with delayed and inaccurate uplink scheduling information, leading to inefficient resource allocation and potential transmission delays, particularly during handovers, RRC connection re-establishment, and Contention-Based Random Access procedures.
Innovation Solution
The method involves determining whether to trigger a scheduling request based on the priority of logical channels and their states, delaying non-priority requests until specific conditions are met, and ensuring accurate buffer status reporting, especially during handovers and contention-based random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the mobile terminal transmits Buffer Status Reports frequently to improve scheduling accuracy, then the accuracy of uplink scheduling information is improved, but the signaling overhead and system resource consumption increase
Solution Approach 1:
The patent changes the parameter of BSR transmission from frequent periodic reporting to event-triggered reporting based on priority levels. When high-priority data arrives or buffer status changes significantly, a BSR is triggered; otherwise, reporting is suppressed. This parameter change reduces signaling overhead while maintaining scheduling accuracy for important data.
Solution Approach 2:
The patent applies different reporting strategies to different logical channel groups based on their priority characteristics. High-priority LCGs trigger BSRs more readily to ensure accurate scheduling information, while low-priority LCGs use suppressed reporting to reduce overhead. This local quality differentiation resolves the contradiction between accuracy and overhead.
2Loss of energy
If the mobile terminal delays scheduling requests for low-priority logical channels to reduce signaling overhead, then the system resource efficiency is improved, but the response time for low-priority data transmission increases
Solution Approach 1:
The patent implements periodic checking of buffer status for delayed LCGs at specific intervals (e.g., every TTI or at scheduled opportunities). This periodic action ensures that low-priority data eventually gets transmitted while avoiding continuous signaling overhead, balancing resource efficiency with acceptable response time.
Solution Approach 2:
The patent performs preliminary assessment of buffer status and priority levels before triggering BSR transmissions. By preliminarily identifying which LCGs warrant immediate reporting versus delayed reporting, the system optimizes resource usage while ensuring timely handling of priority data.
3Measurement precision
If the mobile terminal includes buffer status information in every uplink transmission to maintain accurate scheduling, then the scheduling accuracy is improved, but the uplink payload efficiency decreases
Solution Approach 1:
The patent extracts buffer status reporting from every uplink transmission and makes it conditional. BSR information is taken out and included only when necessary (event-triggered conditions), separating the essential scheduling information from routine data transmissions. This extraction maintains scheduling accuracy while improving payload efficiency by eliminating redundant reporting.
4Speed
If the mobile terminal triggers scheduling requests immediately when data becomes available to reduce transmission delay, then the transmission speed is improved, but the signaling overhead increases
Solution Approach 1:
The patent makes the BSR triggering dynamic rather than static. The decision to trigger a BSR depends on real-time conditions including priority level, buffer status changes, and current system state. This dynamic approach enables fast transmission for high-priority data while suppressing unnecessary signaling for low-priority or stable buffer conditions, resolving the speed-overhead contradiction.
Data Source
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AI summary
A method and mobile terminal for providing uplink scheduling information to a scheduler in a wireless telecommunication system. When a logical channel having data available to transmit triggers a buffer status report, the mobile terminal determines whether a priority level associated with the logical channel exceeds a predefined threshold. If so, the mobile terminal performs a scheduling request procedure with the scheduler. If not, the mobile terminal delays the scheduling request procedure until a predefined timing event has occurred. The predefined timing event may be at least one of expiration of a timer, a radio bearer associated with the logical channel becoming active, and if the scheduling request procedure is being performed using a contention-based random access, contention resolution succeeding for the mobile terminal.