D2D Communication Interference Management in LTE Terminals
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Solution Overview
Problem
In LTE systems, Device-to-Device (D2D) communication experiences interference with cellular communication, and simultaneous D2D and cellular communication performance has not been adequately studied, leading to inefficiencies in terminal apparatus operations and base station control.
Innovation Solution
The implementation of a terminal apparatus and base station apparatus that utilize cell aggregation, D2D resource management, and synchronized transmission timing to minimize interference, allowing efficient D2D communication while maintaining cellular connectivity, through the configuration of primary and secondary cells, and the use of specific physical channels and reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communication is performed within LTE coverage, then D2D communication capability is provided, but interference occurs between D2D and cellular communication
Solution Approach 1:
The patent segments the uplink transmission time into different periods: a first period for cellular communication and a second period for D2D communication. This time-based segmentation allows both cellular and D2D communications to share the same frequency resources without interfering with each other, resolving the contradiction between providing D2D capability and avoiding interference with cellular communication.
2Productivity
If the terminal apparatus simultaneously performs D2D and cellular communication, then communication efficiency is improved, but the complexity of coordinating transmissions increases
Solution Approach 1:
The base station apparatus preliminarily determines the uplink transmission timing for both cellular communication and D2D communication before actual transmission occurs. The terminal apparatus stores this predetermined timing information and automatically follows it during transmission. This preliminary coordination eliminates the need for real-time complex decision-making at the terminal, reducing operational complexity while enabling simultaneous communications.
3Ease of operation
If D2D resources are configured without base station control, then terminal autonomy is improved, but interference management capability deteriorates
Solution Approach 1:
The base station apparatus receives feedback information from the terminal apparatus regarding D2D communication status and uses this feedback to adjust uplink transmission timing and resource allocation. This feedback mechanism allows the terminal to operate autonomously in D2D mode while the base station maintains overall interference management control, balancing terminal autonomy with system reliability.
Data Source
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AI summary
A terminal apparatus transmits information related to communication/discovery between terminal apparatuses to a base station apparatus of EUTRAN. The base station apparatus of the EUTRAN transmits the information related to the communication/discovery between the terminal apparatuses to the terminal apparatus.