Sidelink Congestion Control via Dynamic Resource Release
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Solution Overview
Problem
Current wireless communication systems face challenges in effectively managing congestion in vehicle-to-everything (V2X) communication, particularly in sidelink communications, which affects the reliability and efficiency of data transmission.
Innovation Solution
A method and apparatus that determine granted transmission resources for sidelink communication, measure channel occupancy ratios, and adjust transmission parameters to prevent congestion by releasing resources when necessary, ensuring the channel occupancy ratio does not exceed a configured limit, thereby stabilizing V2X communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission resources are increased for V2X sidelink communication, then data transmission efficiency is improved, but channel congestion increases
Solution Approach 1:
The patent implements a feedback mechanism where the terminal measures the channel occupancy ratio (CR) and compares it with a pre-configured threshold. Based on this feedback, the terminal dynamically adjusts its transmission resource usage - releasing resources when CR exceeds the threshold and utilizing resources when CR is below the threshold, thereby resolving the contradiction between transmission efficiency and congestion control
Solution Approach 2:
The patent transforms the static resource allocation into a dynamic process by continuously monitoring the channel occupancy ratio and adjusting resource usage in real-time. The terminal can release granted transmission resources when congestion is detected and utilize them when the channel is clear, making the system adaptable to changing channel conditions
2Productivity
If channel occupancy ratio is increased to improve transmission capacity, then data throughput is improved, but congestion control reliability deteriorates
Solution Approach 1:
The terminal continuously measures the channel occupancy ratio and uses this feedback to control transmission behavior. When the measured CR exceeds the pre-configured threshold, the terminal releases transmission resources; when CR is below the threshold, the terminal can utilize resources for transmission, ensuring reliable congestion control while maintaining throughput
Solution Approach 2:
The patent changes the operational parameters of the transmission system dynamically based on channel conditions. The terminal adjusts its resource utilization parameter according to the measured channel occupancy ratio, switching between resource release and resource utilization modes to maintain both throughput and reliability
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The disclosure is for controlling congestion of a channel in a wireless communication system According to an embodiment of the present disclosure, a method performed by a terminal in a wireless communication system comprises determining a plurality of granted transmission resources for a sidelink communication, performing a transmission or a retransmission using at least one transmission resource among the plurality of granted transmission resources, receiving an acknowledgement (ACK) for the transmission or the retransmission, in response to the ACK, releasing one or more transmission resources among the plurality of granted transmission resources, measuring a channel occupancy ratio (CR) from transmission resources other than the released one or more transmission resources from the plurality of granted transmission resources, and transmitting a physical sidelink shared channel (PSSCH) to satisfy a condition that the measured CR does not exceed a configured CR limit so that a congestion control is performed.