Terminal Device Communication Method for Deactivated Base Station Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE communication systems, when a base station device is in a deactivated state, the terminal device faces difficulty in detecting the base station, leading to prolonged connection preparation times and reduced transmission efficiency.
Innovation Solution
A terminal device equipped with a detection unit and a channel measurement unit that can detect signals and measure CSI based on a CSI reference resource defined by a valid downlink subframe, allowing for efficient communication even when the base station is in a deactivated state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the base station device is switched to a deactivated state to reduce power consumption, then power consumption is reduced, but the terminal device cannot detect the base station and connection preparation time increases
Solution Approach 1:
The base station device performs preliminary actions by transmitting downlink signals (such as synchronization signals or reference signals) even in the deactivated state. This allows the terminal device to detect and measure the base station without requiring full activation, thereby reducing connection preparation time while maintaining low power consumption.
2Reliability
If the base station device transmits synchronization signal or reference signal in deactivated state to improve detectability, then terminal device can detect the base station, but power consumption increases
Solution Approach 1:
The base station device performs partial action by transmitting only specific downlink signals (synchronization signals or reference signals) necessary for terminal detection, rather than transmitting all downlink signals. This partial transmission provides sufficient detectability for the terminal device while consuming significantly less power than full transmission.
3Productivity
If the base station device transmits downlink signal in deactivated state to enable terminal detection, then transmission efficiency is improved, but the distinction between activated and deactivated states becomes unclear
Solution Approach 1:
The base station device applies local quality by transmitting downlink signals selectively in specific frequency regions or resource elements while maintaining the deactivated state designation. This allows the terminal device to detect and measure the base station for efficient connection, while the base station maintains its deactivated state classification for power management purposes, thus resolving the contradiction between transmission efficiency and state management clarity.
Data Source
AI summary
There is provided a terminal device capable of efficiently performing communication in a communication system in which a base station device and the terminal device communicate with each other. The terminal device that communicates with the base station device by using a plurality of aggregated cells recognizes that a serving cell is stopped in a first state, recognizes that the serving cell is started in a second state, and switches from the first state to the second state based on a received PDCCH.