Buffer Status Reporting in D2D Communication Systems
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Solution Overview
Problem
Current D2D communication systems lack an effective method for transmitting data from multiple user equipment using shared resources, limiting their ability to efficiently manage buffer status and optimize data transmission in proximity-based communication scenarios.
Innovation Solution
A method for buffer status reporting in D2D communication systems, where the MAC entity prioritizes and reports buffer sizes of sidelink logical channels based on ProSe Per-Packet Priority (PPPP), allowing for efficient resource allocation and data transmission by considering the highest priority data first.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple user equipment transmit data using shared resources in D2D communication, then resource utilization is improved, but buffer status management and data transmission efficiency deteriorate due to lack of effective reporting methods
Solution Approach 1:
The patent segments the buffer status reporting by dividing sidelink logical channels into different groups based on ProSe Per-Packet Priority (PPPP) levels. Each group is reported separately in the buffer status report message, allowing the eNodeB to manage resources for different priority data independently. This segmentation resolves the contradiction by enabling efficient multi-UE buffer management without overwhelming complexity.
Solution Approach 2:
The patent introduces PPPP (ProSe Per-Packet Priority) as a new parameter to differentiate and prioritize data from multiple UEs. By changing the reporting mechanism to include priority-based parameters rather than simple buffer size counts, the system can efficiently manage shared resources while maintaining tractable complexity through structured parameter organization.
2Productivity
If buffer status reporting is implemented without priority consideration, then implementation is simpler, but data transmission performance deteriorates due to inability to prioritize high-priority data
Solution Approach 1:
The patent enhances the buffer status report by incorporating PPPP (ProSe Per-Packet Priority) parameters alongside traditional buffer size information. This parameter enrichment allows the system to achieve high throughput by enabling the eNodeB to allocate resources based on data priority while maintaining a manageable reporting structure through standardized parameter formats.
Solution Approach 2:
The patent performs preliminary prioritization of data by PPPP levels before the actual data transmission. The buffer status report pre-organizes buffer information by priority groups, allowing the eNodeB to make informed scheduling decisions in advance. This preliminary action improves throughput without adding complex real-time decision-making requirements during transmission.
3Productivity
If all logical channels are reported equally in buffer status, then reporting process is simpler, but resource allocation efficiency deteriorates due to lack of priority-based allocation
Solution Approach 1:
The patent segments the buffer status reporting structure by organizing sidelink logical channels into priority groups based on PPPP levels. Each segment contains buffer information for channels with the same priority, enabling the eNodeB to allocate resources efficiently according to priority while keeping each segment's structure simple and manageable.
Solution Approach 2:
The patent applies local quality differentiation by treating different priority groups differently in the reporting structure. High-priority channels receive dedicated reporting segments that can be quickly processed and allocated, while lower-priority channels are handled in separate segments. This local differentiation improves resource allocation efficiency without requiring complete restructuring of the entire reporting mechanism.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for performing a buffer status reporting in a D2D communication system, the method comprising: configuring a plurality of sidelink logical channels, wherein each of the plurality of sidelink logical channels has an associated priority and belongs to a LCG, and one or more of LCGs belong to a ProSe Destination; generating a SL BSR MAC CE including buffer sizes of LCGs in decreasing order of a LCG priority, wherein the LCG priority of a LCG is determined as a highest priority of a logical channel among priorities of logical channels belonging to the LCG; and transmitting a MAC PDU including the SL BSR MAC CE.