D2D Communication Resource Allocation for Pairing Efficiency
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Solution Overview
Problem
In Device to Device (D2D) communication, multiple devices attempting connections simultaneously can cause frequency overlapping in the generation of Connection Identifiers (CIDs), leading to inefficiencies and increased power consumption.
Innovation Solution
A method and apparatus for D2D communication that involves determining a resource for transmitting a pairing signal, broadcasting discovery signals with resource information, and selecting a Physical Resource Index (PRI) for pairing, which allows devices to efficiently communicate data without overlapping frequencies, thereby reducing power consumption and improving pairing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple devices attempt connections simultaneously using preconfigured resources, then device discovery and pairing can be performed, but frequency overlapping occurs causing connection inefficiency and increased power consumption
Solution Approach 1:
The patent changes the resource allocation parameters by introducing dynamic resource selection based on Physical Resource Index (PRI) values. Devices receive multiple candidate resources from the base station and select optimal resources based on signal power measurements, transforming the static preconfigured resource approach into a dynamic parameter-adjustment system that avoids frequency overlap and reduces unnecessary transmissions.
Solution Approach 2:
The patent implements feedback mechanisms where devices measure signal power on received discovery signals and use this feedback to select appropriate pairing resources. The base station also receives feedback about device pairing status and buffer sizes, allowing it to optimize resource allocation. This feedback loop enables the system to adapt resource usage in real-time, preventing frequency overlapping and reducing power consumption.
2Ease of operation
If devices use preconfigured resources for device discovery, then discovery process can be simplified, but frequency overlapping in CID generation causes connection problems
Solution Approach 1:
The patent introduces the base station as an intermediary that coordinates resource allocation between devices. Instead of devices independently selecting resources (which causes overlap), the base station acts as a mediator that assigns specific time-frequency resources to each device pair, ensuring no conflicts occur while maintaining the simplicity of the discovery process for the end devices.
Solution Approach 2:
The patent segments the available time-frequency resources into distinct slots assigned to different device pairs. By dividing the resource space and allocating specific segments to specific devices based on PRI values, the system prevents frequency overlapping while maintaining organized and manageable resource usage, thus ensuring reliable connection establishment.
3Productivity
If devices transmit pairing signals on the same frequency simultaneously, then resource utilization appears high, but frequency overlapping increases communication errors
Solution Approach 1:
The patent resolves the conflict by adding temporal dimension to resource allocation. Instead of only frequency-based resource division, the system assigns specific time slots (uplink-downlink configurations) to different device pairs. This multi-dimensional resource allocation (frequency + time) allows high resource utilization without frequency overlapping, as devices transmit on different time-frequency combinations.
Data Source
AI summary
A method and apparatus for exchanging information between devices for use in the pairing process for Device To Device (D2D) communication is provided. A signal transmission/reception method of a device in a mobile communication system includes determining a resource for the device to transmit a pairing signal, transmitting a discovery signal including information on the determined resource, pairing with a neighbor device that received the discovery signal through the resource indicated by the resource information, and communicating data signals with the paired neighbor device. The information exchange method and apparatus for D2D communication is capable of preventing a plurality of devices from attempting pairing on the same frequency simultaneously, thereby improving pairing efficiency and reducing power consumption of the device.