Terminal Buffer Status Report Multiplexing for D2D
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for device-to-device communication in Advanced EUTRA systems do not provide a specific and efficient mechanism for the terminal apparatus to acquire transmission resources, particularly when Buffer Status Reports (BSRs) are limited, making it difficult to simultaneously transmit BSRs for communication with the base station and for device-to-device data communication.
Innovation Solution
The solution involves a method where the terminal apparatus generates and transmits Buffer Status Reports efficiently by selecting appropriate formats and prioritizing the reporting of transmission buffer status, using padding bits to optimize the transmission resource request, allowing for simultaneous communication with the base station and device-to-device data communication by identifying and adjusting the Buffer Status Report format based on available padding bits and priority levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal apparatus transmits Buffer Status Reports for both base station communication and device-to-device communication simultaneously, then the transmission resource acquisition efficiency is improved, but the available uplink transmission resources are insufficient
Solution Approach 1:
The patent combines the BSR for base station communication and the BSR for device-to-device communication into a single uplink transmission. The terminal apparatus multiplexes both buffer status reports in one MAC PDU, allowing simultaneous reporting of both buffer statuses without requiring separate uplink resources, thereby resolving the resource insufficiency issue while maintaining high acquisition efficiency
Solution Approach 2:
The uplink transmission channel is designed to serve multiple functions: it can carry BSR for base station communication, BSR for device-to-device communication, or both simultaneously. This multi-functionality allows the single uplink resource to fulfill multiple reporting purposes, effectively resolving the contradiction between needing to report both buffer statuses and having limited uplink resources
2Device complexity
If the terminal apparatus uses a single Buffer Status Report format, then the transmission complexity is reduced, but the ability to simultaneously report base station and device-to-device buffer status is compromised
Solution Approach 1:
The patent segments the Buffer Status Report into multiple independent components within the same MAC PDU. Each BSR (for base station and for device-to-device) is treated as a separate logical channel indicator with its own LCID, allowing the terminal to report multiple buffer statuses simultaneously while maintaining a unified transmission structure. This segmentation approach reduces complexity compared to creating entirely separate transmission protocols while preserving the ability to report multiple statuses
Solution Approach 2:
The patent embeds multiple BSRs within a single MAC PDU structure. The BSR for base station communication and the BSR for device-to-device communication are nested together in the same uplink transmission frame, with each having its own sub-header and LCID. This nesting allows efficient use of a single transmission resource while carrying multiple independent buffer status reports
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A terminal apparatus according to one aspect of the present invention constitutes and reports an amount-of-transmission-buffer report to be notified to a base station apparatus, based on first transmission data to the base station apparatus, which is prepared in a transmission buffer of the terminal apparatus itself, second transmission data for device-to-device data communication, and a priority level of each piece of transmission data.