D2D Transmission Power Control via Segmented DCI Signaling
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing transmission power control for device-to-device (D2D) communication, particularly in distinguishing between cellular and D2D communication power control information and in effectively transmitting and receiving D2D control information and data.
Innovation Solution
A method for performing transmission power control (TPC) in D2D communication systems, involving the use of a resource pool that includes an SA resource pool and a data resource pool, with control information transmitted through DCI formats 3 or 3A, and utilizing different RNTIs or fields to distinguish between SA and D2D data transmission power control, allowing for efficient power management and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If transmission power control information is not distinguished between cellular and D2D communication, then system complexity is reduced, but transmission power control accuracy deteriorates
Solution Approach 1:
The patent segments transmission power control information into distinct fields: one for cellular communication power control and another for D2D communication power control. This segmentation allows the system to maintain separate control mechanisms for different communication types, improving power control accuracy without significantly increasing overall system complexity through structured information organization.
2Measurement precision
If separate control information is used for SA and D2D data transmission, then transmission power control accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges SA transmission power control information and D2D data transmission power control information into a single downlink control information (DCI) structure. This merging allows both types of power control to be conveyed through unified signaling mechanisms, improving accuracy through separate control fields while limiting device complexity through integrated message structure.
3Device complexity
If transmission power control is not optimized for D2D communication, then device complexity is reduced, but energy efficiency deteriorates
Solution Approach 1:
The patent implements dynamic transmission power control for D2D communication by providing adjustable power control fields in DCI messages. This allows the transmission power to be dynamically optimized based on channel conditions and communication requirements, improving energy efficiency through adaptive power management while maintaining manageable device complexity through standardized control mechanisms.
Data Source
AI summary
The present specification relates to a method by which a first user equipment (UE) performs a transmission power control (TPC) of device-to-device (D2D) communication in a wireless communication system supporting the D2D communication, comprising the steps of: acquiring a resource pool to be used in the D2D communication, the resource pool including a scheduling assignment (SA) resource pool indicating an SA transmission resource region and/or a data resource pool indicating a D2D data transmission resource region; transmitting an SA including information related to D2D data transmission to a second UE through the SA resource pool; and transmitting D2D data to the second UE, wherein the TPC in the D2D communication is performed through control information related to a TPC of the SA and/or the D2D data.