Sidelink Indication for D2D Interference Avoidance
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Solution Overview
Problem
In Vehicle to Everything (V2X) systems based on New Radio (NR) technology, interference occurs due to terminal devices outside a cell using downlink transmission resources of devices within the cell for sidelink data transmission, leading to reliability issues and increased signaling overhead when sharing slot format configurations.
Innovation Solution
A communication method where a terminal device sends indication information through a physical sidelink channel to determine its slot format, and a network device configures this information to prevent sidelink data transmission on downlink resources, reducing interference and signaling overhead by only sharing necessary slot format details.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If terminal devices outside a cell use downlink transmission resources for sidelink data transmission, then spectrum efficiency is improved, but interference occurs on downlink transmissions of devices within the cell
Solution Approach 1:
The patent applies preliminary action by having the first terminal device send indication information about its slot format configuration to a second terminal device before potential interference occurs. This allows the second terminal device to advance knowledge of which time-domain symbols are designated for downlink transmission, enabling it to avoid using those resources for sidelink transmission and thus prevent interference while maintaining efficient spectrum utilization.
2Reliability
If complete slot format configuration information is shared between terminal devices, then interference avoidance is improved, but signaling overhead increases
Solution Approach 1:
The patent applies the extraction principle by having the first terminal device send only the essential indication information about its slot format configuration to the second terminal device, rather than sharing complete configuration details. This selective information sharing provides sufficient data for the second terminal device to identify and avoid downlink transmission resources, thereby maintaining reliable interference avoidance while significantly reducing the signaling overhead associated with transmitting comprehensive configuration information.
3Adaptability or versatility
If flexible slot format is supported with configurable time-domain symbols, then adaptability is improved, but complexity of determining transmission direction increases
Solution Approach 1:
The patent applies the intermediary principle by using indication information as a mediator between the first terminal device's slot format configuration and the second terminal device's transmission decisions. The indication information serves as a simplified representation that translates the complex flexible slot format configuration into actionable guidance for the second terminal device, enabling it to determine appropriate transmission directions without directly processing the full complexity of the configurable time-domain symbol structures.
Data Source
AI summary
A communication method in a D2D system, a terminal device, and a network device, capable of avoiding interference to downlink transmission of a terminal device in a cell caused when another terminal device outside the cell uses a downlink transmission resource of the terminal device in the cell to carry out sidelink data transmission. The communication method in the D2D system includes: a first terminal device sends first indication information by means of a first physical sidelink channel, the first indication information being used for determining a time slot format of a cell in which the first terminal device is located.