User Terminal D2D Frequency Carrier Selection
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Solution Overview
Problem
In networks using multiple frequencies, using a frequency carrier with limited coverage as a D2D signal transmitting/receiving resource leads to inefficient D2D signal transmission and reception, and increased power consumption in D2D terminals.
Innovation Solution
A user terminal that receives system information from a radio base station to control D2D signal transmission and reception using a second frequency carrier different from the first, synchronizing resources based on synchronization signals from either the first or second cell depending on their operational status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a frequency carrier with limited coverage is used as a D2D signal transmitting/receiving resource, then the network can operate on multiple frequencies, but D2D signal transmission and reception become inefficient and power consumption in D2D terminals increases
Solution Approach 1:
The patent introduces a frequency carrier with expanded coverage as an intermediary resource for D2D signal transmission. This intermediary frequency carrier enables terminals with limited coverage to communicate efficiently by providing a broader coverage area, thereby reducing the need for terminals to increase transmission power and lowering overall power consumption in D2D operations
Solution Approach 2:
The patent changes the parameter of frequency carrier coverage by selecting a specific frequency carrier that has expanded coverage characteristics. This parameter change allows the system to maintain multi-frequency operation capability while ensuring that D2D signals can be transmitted and received efficiently across a broader area, reducing power consumption requirements
2Adaptability or versatility
If a frequency carrier with limited coverage is used as a D2D signal transmitting/receiving resource, then the network can operate on multiple frequencies, but D2D signal transmission and reception become inefficient
Solution Approach 1:
The patent introduces a frequency carrier with expanded coverage as an intermediary resource for D2D signal transmission. This intermediary frequency carrier enables terminals with limited coverage to communicate efficiently by providing a broader coverage area, thereby reducing the need for terminals to increase transmission power and lowering overall power consumption in D2D operations
Solution Approach 2:
The patent changes the parameter of frequency carrier coverage by selecting a specific frequency carrier that has expanded coverage characteristics. This parameter change allows the system to maintain multi-frequency operation capability while ensuring that D2D signals can be transmitted and received efficiently across a broader area, reducing power consumption requirements
Data Source
Figure 1A~1C
Figure 2
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AI summary
The present invention is designed so that the increase of power consumption in D2D terminals is prevented even when a frequency carrier that does not have an expanded coverage is used as a D2D signal transmitting/receiving resource where D2D operations are executed in a network in which multiple frequencies are in use. A user terminal is capable of transmitting and receiving device-to-device signals, and has a receiving section that receives system information, which is transmitted from the connecting or serving radio base station and which contains at least information about the resources for transmitting and receiving the device-to-device signals, and a control section that, based on the information about the device-to-device signal transmitting/receiving resources, executes control so that the device-to-device signals are transmitted and received in a second frequency carrier, which is different from a first frequency carrier, in which the information about the device-to-device signal transmitting/receiving resources is transmitted.