Small Cell Discovery Signal Transmission for Power Management
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Solution Overview
Problem
In high-speed and high-capacity communication systems, such as LTE, there is a need for a method to efficiently manage the activation and deactivation of small cell base stations to prevent power waste and signal interference, particularly in densely deployed environments where terminals are concentrated, and to enable terminals to detect the presence of small cell base stations in a deactivation state.
Innovation Solution
A method and device that allow a small cell base station to transmit a discovery signal including a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Cell specific Reference Signal (CRS) in a deactivation state, enabling terminals to receive and measure these signals to determine the activation state of the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small cell base stations are deployed in dense environments to increase communication capacity, then the communication capacity and coverage are improved, but power consumption increases and signal interference occurs
Solution Approach 1:
The base station dynamically switches between activation and deactivation states based on terminal concentration and communication demand. This dynamic state transition allows the system to adapt to changing traffic conditions, activating small cells when terminals are concentrated and deactivating them when not needed, thereby resolving the contradiction between maintaining communication capacity and reducing power consumption
Solution Approach 2:
The system changes the operational state parameter of the base station (from active to deactivated) based on terminal density and communication requirements. By modifying this state parameter, the system can efficiently manage power consumption while maintaining the ability to provide high communication capacity when needed
2Use of energy by moving object
If small cell base stations are deactivated to reduce power consumption, then power consumption is reduced, but terminals cannot detect the presence of these base stations
Solution Approach 1:
Before fully deactivating the base station to save power, the system performs a preliminary action by transmitting a discovery signal. This preliminary signal transmission allows terminals to detect and measure the base station's presence and quality metrics, ensuring that detection capability is maintained even in the deactivated state, thus resolving the contradiction between power reduction and information loss
3Reliability
If small cell base stations are activated to improve communication service, then communication quality is improved, but signal interference increases in dense environments
Solution Approach 1:
Instead of fully activating all small cell base stations, the system applies partial action by selectively activating only those base stations that are needed based on terminal concentration and communication demand. This partial activation approach maintains communication quality for served terminals while minimizing the overall signal interference in the dense environment, thus resolving the contradiction between reliability improvement and harmful factor reduction
Data Source
AI summary
The present invention relates to: a method by which a small cell having a relatively narrow cell range changes to an active state in an environment in which the small cell is arranged; and a method and a device by which a terminal detects a small cell base station in an inactive state. According to one embodiment of the present invention, provided are a method and a device by which a terminal measures a discovery signal, the method comprising the steps of: receiving a discovery signal from a small cell base station in an inactive state; and measuring the discovery signal on the basis of a reference signal of the discovery signal comprising a primary synchronization signal (PSS), a secondary synchronization signal (SSS) and a cell-specific reference signal (CRS).