Cell Synchronization via Air Interface Listening
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Solution Overview
Problem
In wireless communication systems, especially in small cell scenarios, network synchronization across cells is challenging, particularly in inter-operator scenarios where backhaul signaling is not established, and existing methods lack efficiency and accuracy in stratum-level synchronization.
Innovation Solution
A method and apparatus for network synchronization using network listening, where a cell receives synchronization signals via the air interface, utilizing a radio frequency unit and processor to perform synchronization based on system information and reference signals, allowing for accurate synchronization without backhaul signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network synchronization is performed using backhaul signaling in small cell scenarios, then synchronization can be established between cells, but the complexity of the system increases and the method becomes inapplicable in inter-operator scenarios where backhaul signaling is not established
Solution Approach 1:
The patent extracts the synchronization function from the backhaul signaling path and implements it directly over the air interface. Small cells receive synchronization signals (PSS, SSS, PBCH) directly from macro cells or other synchronization sources through the radio interface, eliminating the need for backhaul signaling infrastructure. This extraction enables synchronization in inter-operator scenarios where backhaul connections are not established.
Solution Approach 2:
The patent introduces synchronization signals (PSS, SSS, PBCH) as intermediary elements that carry timing and frequency synchronization information over the air interface. These signals act as mediators between synchronization sources (macro cells, GPS) and small cells, enabling synchronization without direct backhaul connections. The synchronization signals translate physical layer timing information into usable synchronization data for small cells.
2Measurement precision
If existing synchronization methods are used in inter-operator scenarios, then some level of synchronization can be achieved, but the accuracy and efficiency are insufficient due to lack of stratum-level considerations
Solution Approach 1:
The patent changes the synchronization approach by implementing stratum-level hierarchy (similar to GPS stratum) where synchronization accuracy is categorized into levels. Small cells determine their stratum level based on the quality and source of received synchronization signals. This parameter change enables differentiated synchronization accuracy - cells can operate at higher accuracy levels when good synchronization sources are available and degrade gracefully to lower levels when sources are poor, improving both accuracy and efficiency in inter-operator scenarios.
Data Source
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AI summary
The method and apparatus for synchronization are provided. The method thereof comprises receiving signal for synchronization from a source cell, performing synchronization to the source cell based on system information and/or a reference signal for synchronization and receiving and/or transmitting data at a timing based on the synchronization, wherein the reference signal is received via air interface.