ProSe BSR Cancellation for Uplink Resource Efficiency
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Solution Overview
Problem
In LTE systems, when UE has sufficient uplink grants for transmitting triggered ProSe BSRs but all ProSe destinations have no available data, the UE is unable to determine the contents of the ProSe BSR MAC CE to be transmitted, leading to an inability to report the current buffer status.
Innovation Solution
A User Equipment (UE) apparatus with a first judging unit to assess if allocated uplink resources can accommodate a ProSe BSR MAC CE and a second judging unit to check for available side-link data, with a cancelling unit to cancel all triggered ProSe BSRs when no data is available, ensuring accurate reporting only when data exists.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits ProSe BSR MAC CE when all ProSe destinations have no available data, then the uplink resource is utilized for reporting, but the reported buffer status is inaccurate or meaningless
Solution Approach 1:
Instead of reporting BSR when data exists, the patent inverts the logic by checking whether data exists first, and only then deciding to report. The UE determines whether to transmit ProSe BSR MAC CE by checking if any ProSe destination has available data, and cancels the BSR transmission if no data is available, thereby avoiding meaningless reports.
Solution Approach 2:
The UE autonomously determines whether to transmit the ProSe BSR MAC CE by checking its own buffer status at the transmission moment. The UE serves itself by making the decision based on internal data availability information, without needing external network control for this specific determination.
2Ease of operation
If the UE determines BSR contents before checking data availability, then the reporting process is simplified, but the UE cannot determine what to report when no data exists
Solution Approach 1:
The patent applies preliminary action by checking data availability before determining BSR contents. The UE first checks whether any ProSe destination has available data at the TTI moment, and only then proceeds to determine the BSR MAC CE contents. This preliminary check ensures that the UE only attempts to report when there is actual data to report.
3Productivity
If the UE always transmits triggered ProSe BSRs, then the buffer status reporting is frequent, but unnecessary reporting occurs when no data is available
Solution Approach 1:
The patent introduces feedback by having the UE check its own buffer status at the moment of intended BSR transmission. The UE uses real-time feedback information about data availability at each ProSe destination to decide whether to cancel or proceed with the BSR transmission, thereby avoiding wasted uplink resources on meaningless reports.
Data Source
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AI summary
This application provides a method and apparatus for processing a buffer status report and a communication system, the method being applicable to user equipment (UE) and including: whether in an TTI where an allocated uplink resource for the TTI is capable of accommodating a ProSe BSR MAC CE containing a buffer status for at least one ProSe Destination and its corresponding MAC subheader is judged; if yes, whether there exist side-link data available for transmission in the TTI is judged; and if no, all triggered ProSe BSRs are cancelled. With embodiments of this disclosure, a problem that UE is unable to determine contents of a ProSe BSR MAC CE to be transmitted at a TTI when triggered ProSe BSRs can be transmitted is solved.