Cell Dormancy Signaling for Wireless Synchronization
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Solution Overview
Problem
Current LTE systems face inefficiencies in power usage and interference due to continuous signal transmission of PSS, SSS, and CRS, leading to transmission delays and reduced system performance when transitioning between dormant and active states.
Innovation Solution
A method where a base station sends specific signals to user equipment indicating the dormant or active state of a cell, using signals like PSS, SSS, CRS, or CSI-RS, to enable timely state detection and processing, thereby reducing unnecessary signal transmission and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station continually sends signals with a relatively short period (PSS, SSS, CRS) to ensure measurement and synchronization requirements, then the UE can maintain proper synchronization and measurement capabilities, but the power efficiency of the cell is greatly reduced and severe interference between cells occurs
Solution Approach 1:
The patent applies periodic action by introducing a cell dormancy mechanism where signal transmission is suspended during dormant periods and activated during active periods. The base station sends indication signals to notify UEs of state transitions, allowing the cell to periodically switch between transmission and non-transmission states based on service requirements, thereby reducing overall power consumption while maintaining necessary synchronization and measurement capabilities during active periods
Solution Approach 2:
The patent implements dynamics by making the cell transmission state adjustable and adaptable rather than static. The base station can dynamically transition the cell between dormant and active states based on service demand, and UEs can be notified of these state changes through indication signals. This dynamic mechanism allows the system to optimize power efficiency by reducing transmission during low-activity periods while ensuring service quality during high-activity periods
2Reliability
If the base station continually sends signals with a relatively short period (PSS, SSS, CRS) to ensure measurement and synchronization requirements, then the UE can maintain proper synchronization and measurement capabilities, but the load of signal transmission increases and system performance is reduced
Solution Approach 1:
The patent applies periodic action by introducing a cell dormancy mechanism where signal transmission is suspended during dormant periods and activated during active periods. The base station sends indication signals to notify UEs of state transitions, allowing the cell to periodically switch between transmission and non-transmission states based on service requirements, thereby reducing overall power consumption while maintaining necessary synchronization and measurement capabilities during active periods
Solution Approach 2:
The patent implements dynamics by making the cell transmission state adjustable and adaptable rather than static. The base station can dynamically transition the cell between dormant and active states based on service demand, and UEs can be notified of these state changes through indication signals. This dynamic mechanism allows the system to optimize power efficiency by reducing transmission during low-activity periods while ensuring service quality during high-activity periods
3Use of energy by moving object
If the cell enters dormant state and no signal transmission is performed, then power efficiency is improved and interference is reduced, but transmission delay occurs when service needs to be transmitted
Solution Approach 1:
The patent applies preliminary action by having the base station send indication signals to notify UEs of the cell state transitions before actual service transmission begins. When the cell transitions from dormant to active state, the base station proactively notifies UEs in advance, allowing them to prepare for upcoming service transmission. This preliminary notification mechanism reduces transmission delay by eliminating the need for UEs to wait for signal detection after state changes, while still maintaining the power efficiency benefits of the dormancy mechanism
Data Source
AI summary
Embodiments of the present disclosure provide a method, where the method includes: when determining that a first cell enters or prepares to enter a dormant state, sending, by a base station, a first signal to a user equipment (UE) in the first cell, where the first signal carries information about time when the first cell enters the dormant state, for determining, according to the information about the time, that the first cell enters the dormant state; and when determining that the first cell enters an active state from the dormant state, sending, by the base station, a second signal to the user equipment in the first cell, for determining, according to the second signal, that the first cell enters the active state. By using technical solutions provided in the present disclosure, the UE can discover a state change of a cell in time.