Sidelink Resource Availability Detection for Low Latency D2D
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current Device-to-Device (D2D) communication technologies experience significant delays due to the periodic transmission of control and data signals, which is a limitation in next-generation radio communication systems like 5G, particularly in scenarios requiring low latency such as vehicle-to-everything (V2X) communications.
Innovation Solution
The technology involves a user equipment that determines the availability of a second region in a radio frame for D2D signal transmission, allowing time-multiplexing of D2D physical control and data channels, and utilizes carrier information to selectively use carriers dedicated for D2D communication, reducing delay by optimizing signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If control signals and data signals are periodically transmitted at long intervals in current D2D technology, then device complexity is reduced and ease of operation is improved, but communication delay increases significantly
Solution Approach 1:
The patent implements dynamic resource allocation where the transmission interval of control signals and data signals is adjusted based on communication conditions. The system switches between long intervals (40ms) for normal operation and short intervals for low-latency requirements, allowing the communication system to adapt its timing characteristics dynamically rather than using fixed periodic transmission
Solution Approach 2:
The patent changes the time parameter of signal transmission by introducing variable transmission intervals. The system can select between different interval configurations (e.g., 40ms or shorter) based on service requirements, particularly for V2X applications where latency must be minimized while maintaining efficient resource usage
2Quantity of substance
If D2D communication uses shared carriers with base station communication, then spectrum utilization is improved, but interference between D2D signals and base station signals increases
Solution Approach 1:
The patent segments the radio resources by separating D2D communication resources from base station communication resources. Dedicated D2D carriers are allocated specifically for device-to-device communication, physically separating the signal streams and eliminating interference while maintaining high spectrum utilization through efficient carrier allocation
Solution Approach 2:
The patent introduces dedicated D2D carriers as intermediary resources that mediate between the need for spectrum efficiency and interference avoidance. These specialized carriers act as a buffer zone, allowing D2D communication to occur without directly competing with base station signals, thus resolving the interference problem while maintaining resource efficiency
Data Source
AI summary
A terminal is disclosed including a receiver configured to receive first sidelink control information (SCI) in a first physical sidelink control channel (PSCCH) from another terminal; a processor configured to measure a reception level based on the first PSCCH and determine whether a radio resource for sidelink transmission is usable based on the reception level; and a transmitter configured to transmit data via a physical sidelink shared channel (PSSCH) within the radio resource, wherein the processor is configured to determine to not use the radio resource for transmission when the reception level of the first PSCCH is higher than a threshold. In other aspects, a radio communication system and a communication method are also disclosed.