Bi-directional Buffer Status Reporting for V2X Latency
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Solution Overview
Problem
Current V2X communication systems face challenges in efficiently transmitting buffer status reports and scheduling requests for bi-directional transmissions in high-density urban areas, leading to unstable intelligent transportation systems and high latency, which are not adequately addressed by existing ProSe technologies.
Innovation Solution
A bi-directional transmission method is introduced, allowing for the use of both uplink and sidelink channels, with a new type of buffer status report MAC control element and radio network temporary identity, enabling efficient data transmission between vehicles or between vehicles and other devices, and allowing for easy offloading of traffic between UL and SL channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing ProSe technologies are used for V2X communication, then basic peer-to-peer communication is enabled, but system stability deteriorates in high-density urban areas and latency increases
Solution Approach 1:
The patent segments the communication system into two distinct transmission directions: uplink (vehicle to base station) and sidelink (vehicle to vehicle). This segmentation allows independent optimization of each channel type, enabling the system to handle high-density urban scenarios more effectively by routing appropriate traffic through the most suitable channel, thereby improving stability and reducing latency
Solution Approach 2:
The patent introduces dynamic buffer status reporting mechanisms that adapt to changing traffic conditions. The MAC entity can dynamically trigger buffer status reports based on data availability in UL or SL channels, allowing the system to respond flexibly to varying density conditions and traffic patterns, thus improving reliability and reducing latency
2Productivity
If only uplink or only sidelink channels are used, then channel management is simplified, but resource utilization efficiency deteriorates due to inability to offload traffic between channels
Solution Approach 1:
The patent creates a multi-functional MAC entity that can handle both uplink and sidelink transmissions. This universal MAC entity manages buffer status for both UL and SL channels, triggering appropriate buffer status reports based on which channel has data available. This allows flexible traffic offloading between channels while maintaining a unified management structure, improving resource utilization without proportionally increasing complexity
Solution Approach 2:
The patent implements preliminary buffer status reporting mechanisms where the MAC entity proactively reports buffer status before data transmission is needed. By monitoring data availability in advance for both UL and SL channels and triggering reports accordingly, the system prepares resource allocation ahead of time, improving overall resource utilization efficiency
Data Source
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AI summary
A method and apparatus for transmitting a buffer status report for a bi-directional transmission in a wireless communication system is provided. A user equipment (UE) triggers a buffer status report for the bi-directional transmission, and transmits the buffer status report for the bi-directional transmission or a scheduling request for the bi-directional transmission to a network. The bi-direction transmission may correspond to vehicle-to-everything (V2X) communication.