Terminal Power Control for Simultaneous D2D Cellular
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Solution Overview
Problem
Existing technologies have not adequately addressed the challenge of a terminal device capable of efficiently performing both device-to-device (D2D) and cellular communication simultaneously, lacking efficient communication methods with base station devices.
Innovation Solution
The terminal device is configured to operate in modes that allow simultaneous D2D and cellular communication by managing resource allocation and power control, using specific physical channels and signals, and by transmitting information about D2D capabilities and configurations to the base station, enabling efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a terminal device performs D2D and cellular communication simultaneously, then communication versatility is improved, but power management complexity increases
Solution Approach 1:
The patent segments power management into separate control mechanisms for D2D and cellular communications. The terminal device independently determines transmit power for D2D signals and cellular signals, allowing each communication type to be managed separately rather than as a unified complex system. This segmentation reduces overall power management complexity while maintaining communication versatility.
Solution Approach 2:
The patent implements dynamic power adjustment where the terminal device can vary transmit power levels based on real-time communication needs. The power control unit dynamically determines appropriate power levels for D2D and cellular communications, enabling flexible adaptation to different communication scenarios without requiring complex static power management configurations.
2Productivity
If a terminal device manages multiple communication modes, then communication efficiency is improved, but power consumption increases
Solution Approach 1:
The patent employs periodic power management cycles where the terminal device alternates between D2D and cellular communication modes based on operational requirements. The device periodically assesses communication needs and switches between modes accordingly, improving overall communication efficiency while managing power consumption through structured temporal separation of communication activities.
Solution Approach 2:
The patent utilizes parameter changes in power management, where the terminal device adjusts transmit power parameters dynamically based on the active communication mode. By changing power parameters according to whether D2D or cellular communication is active, the system optimizes power consumption while maintaining high communication efficiency across multiple modes.
3Reliability
If the terminal device transmits D2D capability information to the base station, then communication reliability is improved, but information transmission overhead increases
Solution Approach 1:
The patent extracts and transmits only the essential D2D capability information to the base station, rather than transmitting complete device configuration data. This selective information extraction approach ensures communication reliability by providing necessary capability details while minimizing information transmission overhead by excluding redundant or unnecessary data.
Solution Approach 2:
The terminal device performs preliminary transmission of D2D capability information during initial connection setup or periodic reporting, rather than continuously transmitting status updates. This preliminary action approach establishes reliable communication parameters upfront while reducing ongoing information transmission overhead by maintaining established configurations without constant retransmission.
Data Source
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AI summary
With respect to uplink carrier aggregation, transmit power in a serving cell (c) is determined on the basis of maximum output power (PCMAX, C) for the serving cell c and total maximum output power (PCMAX). The maximum output power (PCMAX, C) for the serving cell (c) is based on maximum output power (PPowerClass) defined by a power class corresponding to a band to which the serving cell (c) belongs, and the total maximum output power (PCMAX) is based on maximum output power (PPowerClass) defined by a power class corresponding to a combination of aggregated bands.