D2D Signal Resource Pattern Collision Avoidance
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently managing channel state information and reducing interference in device-to-device (D2D) communication, particularly in determining resource collisions between terminals and configuring resource patterns to minimize interference.
Innovation Solution
A method for transmitting D2D signals involves setting a resource pattern with distinct resource units for transmission and reception, monitoring for collisions, and reconfiguring patterns based on identifier information to prevent interference, using a processor and RF unit to manage resource allocation and signal transmission in a wireless communication system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communication is implemented in LTE system, then direct device-to-device communication capability is improved, but interference management and resource collision detection become more complex
Solution Approach 1:
The resource pool is segmented into multiple resource units with different patterns, where each pattern consists of specific subframes configured for transmission and reception. This segmentation allows terminals to select appropriate patterns based on their communication needs, reducing overall system complexity while maintaining D2D capability.
Solution Approach 2:
The patent implements dynamic resource pattern selection where terminals can switch between different resource patterns based on collision detection results. The resource allocation is not static but adapts dynamically through feedback mechanisms, allowing the system to handle interference efficiently without requiring complex centralized control.
2Productivity
If resource patterns are configured for D2D transmission, then resource allocation efficiency is improved, but collision detection between terminals becomes more difficult
Solution Approach 1:
The patent employs periodic resource patterns where transmission and reception occur at regular intervals defined by the resource pattern configuration. This periodic structure makes collision detection more straightforward because terminals can predict when to expect signals and when to monitor for collisions, transforming an otherwise difficult detection problem into a periodic measurement task.
Solution Approach 2:
The system implements feedback mechanisms where terminals report collision detection results to the network, which then adjusts resource pattern allocations. This feedback loop continuously improves collision detection accuracy while maintaining efficient resource allocation, as the network can identify collision-prone patterns and reassign resources accordingly.
3Reliability
If multiple resource units are used for D2D signal transmission, then communication reliability is improved, but interference between different terminals increases
Solution Approach 1:
The patent applies local quality by assigning different resource patterns to different terminals or terminal groups based on their specific communication requirements and interference conditions. Instead of using a uniform resource allocation scheme, each terminal receives customized resource pattern configuration that optimizes its local communication quality while minimizing interference to others.
Solution Approach 2:
The system changes resource allocation parameters dynamically based on detected interference levels and collision patterns. When interference is detected between terminals using certain resource units, the network adjusts parameters such as pattern selection, subframe allocation, or resource unit assignment to reduce interference while maintaining the redundancy provided by multiple resource units for reliable communication.
Data Source
AI summary
The present invention relates to a method and device for transmitting a device to device (D2D) signal by a first terminal in a wireless communication system. More particularly, the method comprises the steps of: setting a first resource pattern configured by at least one first resource unit and at least one second resource unit; transmitting a D2D signal in a first sub-frame corresponding to the first resource unit on a first resource area; and determining whether the first resource area of the first terminal collide with a second resource area of a second terminal by monitoring a D2D signal of the second terminal in a second sub-frame corresponding to the second resource unit on the first resource area, wherein the first resource pattern is different from a second resource pattern set by the second terminal in order to transmit the D2D signal.