Delayed Random Access for NTN Buffer Status Reporting
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Solution Overview
Problem
Wireless communications in non-terrestrial networks (NTN) face inefficiencies such as increased signal propagation delay, power consumption, and uplink interference due to inefficient random access procedures triggered by buffer status reports (BSR), leading to higher transmission latency.
Innovation Solution
Implementing a delayed initiation of random access procedures after BSR triggering, with selective packet data unit generation based on configuration parameters like BSR validation timer, size threshold, and uplink grant, to avoid parallel BSRs and retriggering, thereby reducing power consumption and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If random access procedure is immediately initiated after BSR triggering, then uplink data transmission can start quickly, but power consumption increases and uplink interference occurs
Solution Approach 1:
The patent applies preliminary action by delaying the random access procedure initiation after BSR triggering, allowing the system to prepare and assess buffer status before committing to the access procedure. This delay mechanism prevents premature transmissions that would increase power consumption while still maintaining relatively low latency through selective triggering based on buffer status validation.
2Productivity
If random access procedure is initiated after BSR triggering, then uplink data can be transmitted, but uplink interference to other wireless devices increases
Solution Approach 1:
The patent implements feedback mechanisms by validating buffer status reports against configured parameters (BSR validation timer, BSR size threshold) before initiating random access procedures. This feedback loop ensures that transmissions are only initiated when genuinely necessary, reducing unnecessary uplink interference to other wireless devices while maintaining productive data delivery when buffer status truly warrants transmission.
3Reliability
If parallel BSRs are triggered, then buffer status reporting is comprehensive, but communication overhead with base station increases
Solution Approach 1:
The patent applies partial action by selectively triggering only the necessary BSR reports based on validation against configured thresholds. Instead of always triggering comprehensive parallel BSRs, the system triggers BSRs partially - only when buffer status actually exceeds thresholds or timing conditions are met. This reduces communication overhead with the base station while maintaining sufficient reporting accuracy for reliable uplink scheduling decisions.
4Reliability
If BSR is retriggered frequently, then buffer status is continuously updated, but transmission latency increases
Solution Approach 1:
The patent implements periodic action through the BSR validation timer mechanism, which controls when BSRs are retriggered based on time intervals and buffer status changes. Instead of continuous or frequent retriggering, the system uses periodic validation - checking buffer status at configured intervals and only triggering BSRs when actual changes warrant reporting. This reduces transmission latency by avoiding unnecessary retriggering while maintaining reliable buffer status updates at appropriate periodic intervals.
Data Source
AI summary
Wireless communications may comprise one or more random access procedures. A random access procedure may be associated with a buffer status report (BSR). The BSR report may be maintained based on one or more conditions associated with the RA procedure, such as awaiting a random access response, an ongoing RA delay trigger timer, and/or transmission of the BSR.