Base Station Frequency Synchronization Without Sync Ethernet
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Solution Overview
Problem
Existing communication systems face challenges in maintaining phase synchronization between base stations without relying on synchronous Ethernet, as many fixed transport networks used in cellular networks are not synchronous Ethernet-based, limiting deployment in certain application scenarios.
Innovation Solution
A frequency synchronization method where a first base station obtains and determines the frequency offset of a second base station, calculates the frequency difference between the two, and performs frequency synchronization based on this offset, allowing synchronization without relying on synchronous Ethernet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If air interface synchronization technology is used to implement phase synchronization between base stations, then synchronization can be achieved, but the adjustment period cannot be too short or the phase difference will fluctuate rapidly
Solution Approach 1:
The patent introduces a frequency offset compensation mechanism as an intermediary between phase synchronization adjustments. By measuring and compensating for frequency offsets between base stations, the system can maintain phase synchronization accuracy over longer periods without frequent adjustments, thus resolving the contradiction between synchronization accuracy and adjustment frequency.
2Reliability
If synchronous Ethernet is used to maintain frequency synchronization, then frequency synchronization can be maintained, but the system depends on synchronous Ethernet infrastructure which is not available in many fixed transport networks
Solution Approach 1:
The patent extracts the frequency synchronization function from the synchronous Ethernet infrastructure and implements it directly between base stations using air interface measurements. This removes the dependency on synchronous Ethernet while maintaining frequency synchronization reliability, enabling deployment in networks without such infrastructure.
Solution Approach 2:
Base stations perform self-measurement of frequency offsets using signals received over the air interface, and autonomously adjust their frequency without external synchronization infrastructure. This self-service capability enables deployment flexibility while maintaining synchronization reliability.
3Stability of the object's composition
If frequent phase adjustments are made to prevent rapid phase fluctuation, then phase synchronization can be maintained, but this increases system complexity and adjustment overhead
Solution Approach 1:
The patent performs preliminary measurement and compensation of frequency offsets before phase differences become problematic. By proactively compensating for frequency drift, the system maintains phase stability without requiring frequent reactive adjustments, thereby reducing system complexity while maintaining stability.
Data Source
Figure 1A~1B
Figure 2~4
Figure 5A~5B
AI summary
Embodiments of the present invention relate to the communications field, and in particular, to frequency synchronization of base stations. In a frequency synchronization method, a first base station obtains a second frequency offset of a second base station, determines a frequency difference between the first base station and the second base station, determines a first frequency offset of the first base station based on the second frequency offset and the frequency difference, and performs frequency synchronization based on the first frequency offset. According to solutions of the embodiments of the present invention, the first base station can determine, through interaction between the first base station and the second base station, the first frequency offset of the first base station without depending on a synchronous Ethernet, to perform frequency synchronization.