Base Station Discovery Signals for Terminal Connection in Stop State
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Solution Overview
Problem
When a base station device is switched to a stop state, the transmission of synchronization and reference signals is halted, making it difficult for terminal devices to find the base station, resulting in prolonged preparation times and reduced transmission efficiency.
Innovation Solution
Implementing a communication method that allows terminal devices to detect and connect with base stations in a stop state by using specific discovery signals and measurement events, enabling efficient communication even when the base station is not actively transmitting synchronization or reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the base station device is switched to the stop state to reduce power consumption and inter-cell interference, then power consumption and interference are reduced, but transmission efficiency deteriorates due to prolonged connection preparation time
Solution Approach 1:
The base station device performs preliminary actions by transmitting discovery signals before switching to the stop state. These discovery signals contain advance information about the stop state duration and resumption timing, allowing terminal devices to prepare for connection in advance rather than waiting passively after the stop state begins, thus reducing the effective connection preparation time while maintaining power savings
2Object-generated harmful factors
If the base station device is switched to the stop state to reduce inter-cell interference, then interference is reduced, but transmission efficiency deteriorates due to prolonged connection preparation time
Solution Approach 1:
The base station device transmits discovery signals containing information about the upcoming stop state and resumption timing before actually entering the stop state. This preliminary information transmission allows terminal devices to adjust their connection procedures in advance, reducing the impact on transmission efficiency while still achieving the interference reduction benefit of the stop state
3Use of energy by moving object
If synchronization and reference signals are halted during stop state to save power, then power consumption is reduced, but terminal devices cannot find the base station, increasing connection preparation time
Solution Approach 1:
The invention extracts the essential connection information from the full set of synchronization and reference signals. Instead of transmitting all standard signals during the stop state, the base station transmits only discovery signals that contain the critical information needed for terminal devices to find and connect to the base station, significantly reducing power consumption while minimizing connection preparation time
Solution Approach 2:
The discovery signals are transmitted in advance of the stop state or at its beginning, providing terminal devices with necessary connection information before the base station enters the low-power state. This preliminary information delivery eliminates the need for terminal devices to continuously monitor full synchronization signals during the stop state, reducing both power consumption and connection preparation time
Data Source
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AI summary
A terminal device capable of communicating with a base station device includes a reception unit which performs first measurement based on a first RS and performs second measurement based on a second RS, and a higher layer processing unit which reports a result of the first measurement and a result of the second measurement to the base station device. The result of the first measurement is reported to the base station device in a first state. The result of the first measurement or the result of the second measurement is reported to the base station device in a second state.