Mode 4 D2D Resource Selection via Physical Layer Sensing
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Solution Overview
Problem
In D2D communication systems, especially in V2X communication, the coexistence of terminal devices using different transmission modes (mode 3 and mode 4) can lead to insufficient available resources for terminal devices using mode 4, compromising the reliability of data transmission.
Innovation Solution
A method for resource selection in D2D communication where the physical layer of a terminal device using mode 4 performs sensing in a resource pool to obtain a resource set, excluding resources occupied by terminal devices using mode 3, and reports this resource set to the higher layer for resource allocation or reselection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If terminal devices using mode 3 and mode 4 share resource pools, then resource utilization is improved, but the reliability of mode 3 transmission is compromised
Solution Approach 1:
The patent segments the resource pool into two distinct parts: resources reserved for mode 3 terminals and resources available for mode 4 terminals. The base station configures separate resource pools (first resource pool for mode 3, second resource pool for mode 4), preventing mode 4 terminals from interfering with mode 3 transmissions while maintaining high overall resource utilization.
Solution Approach 2:
Different quality requirements are applied to different parts of the resource pool. Mode 3 resources are protected with higher reliability guarantees, while mode 4 resources can be used more flexibly. The base station allocates specific time-frequency resources with different characteristics to满足不同 transmission mode requirements.
2Reliability
If resources are protected for mode 3 terminals, then reliability of mode 3 transmission is improved, but available resources for mode 4 terminals become insufficient
Solution Approach 1:
The base station dynamically manages resource pools that can serve multiple purposes. The first resource pool primarily serves mode 3 terminals but can be adjusted based on traffic conditions. The second resource pool serves mode 4 terminals and can be expanded when mode 3 traffic is low, allowing resources to fulfill multiple functions across different transmission modes.
Solution Approach 2:
The patent implements dynamic resource allocation where the base station can adjust the size and configuration of resource pools in real-time based on traffic conditions, channel state, and QoS requirements. This allows the system to optimize the balance between mode 3 reliability and mode 4 resource availability dynamically.
3Loss of time
If mode 4 terminals autonomously select resources, then transmission delay is reduced, but interference with mode 3 terminals increases
Solution Approach 1:
The patent extracts mode 4 terminals from the mode 3 resource pool and assigns them to a separate second resource pool. Mode 4 terminals autonomously select resources only from their designated pool, completely eliminating interference with mode 3 terminals while preserving the low-latency benefits of autonomous selection.
Solution Approach 2:
The base station acts as an intermediary that configures and manages separate resource pools for different transmission modes. It provides mode 4 terminals with autonomous resource selection capability within their designated pool, while the pool configuration itself serves as an intermediary mechanism that prevents interference with mode 3 terminals.
Data Source
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AI summary
The present application discloses a method for resource selection in D2D communication and a terminal device, the method includes: performing, by a physical layer of a first terminal device, sensing in a first resource pool on a first carrier within a time interval [n + T1, n + T2] to obtain a first resource set, and resources in the first resource set can be used for the first terminal device to transmit a target service, where n is a time when the target service arrives, or a time when the first terminal device determines that performing sensing is required, 0≤T1<T2; and reporting, by the physical layer of the first terminal device, information of the first resource set to a higher layer of the first terminal device. Therefore, the terminal device can also obtain transmission resources for transmitting the target service when the available resources are insufficient for resource selection.