Indoor Radio Node Synchronization via Dynamic Master Selection
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Solution Overview
Problem
In indoor environments, cellular-telephone network performance is often degraded due to challenges in synchronizing small cells, especially when they cannot receive signals from external devices or systems like global positioning systems, leading to difficulties in maintaining network quality and service.
Innovation Solution
A radio node in a cellular-telephone network synchronizes with other radio nodes using a selection technique to choose a synchronization master based on the communication environment, employing Precision Time Protocol (PTP) for time, frequency, and phase synchronization, even without external signal reception, by utilizing local crystal oscillators or other available timing references.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If small cells use external synchronization sources (GPS, macrocell signals), then synchronization accuracy is improved, but system complexity and dependency on external infrastructure increases
Solution Approach 1:
The patent implements self-service by enabling small cells to autonomously select and synchronize with the most suitable master clock from available sources without requiring manual configuration or external infrastructure. The system automatically evaluates multiple synchronization sources (GPS, macrocell signals, or peer small cells) and selects the optimal one based on current network conditions, making the synchronization system independent of external infrastructure while maintaining high accuracy.
2Adaptability or versatility
If small cells are deployed in indoor environments without external synchronization sources, then deployment flexibility is improved, but synchronization reliability deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the synchronization strategy based on the operational environment. When external synchronization sources are unavailable in indoor settings, the system changes its parameters to use alternative sources such as peer small cell nodes or local clock references. This dynamic adaptation allows the system to maintain synchronization reliability across diverse deployment scenarios, from outdoor macrocell environments to indoor small cell networks without external support.
3Area of stationary object
If multiple small cells are deployed to improve indoor coverage, then network coverage is improved, but difficulty in synchronizing between cells increases
Solution Approach 1:
The patent implements feedback mechanisms where small cells continuously monitor the quality and availability of synchronization sources and adjust their synchronization relationships accordingly. The system uses feedback from network conditions, signal strength, and synchronization quality metrics to dynamically reconfigure which cell serves as the master clock and which serve as slaves. This feedback-driven approach enables automatic synchronization optimization across multiple deployed small cells, reducing manual configuration complexity while maintaining comprehensive network coverage.
Data Source
AI summary
A communication technique for synchronizing a set of radio nodes is described. In this communication technique, the radio node arbitrates (e.g., using a precision time protocol or PTP) with the other radio nodes based on a selection technique to select a synchronization master in the set of radio nodes. This synchronization master may be selected to have a predefined performance based on a type of communication environment of the set of radio nodes. For example, the type of communication environment may include overlap between at least one of the radio nodes in the set of radio nodes and a macrocell in a cellular-telephone network, or may exclude overlap between the set of radio nodes and the macrocell. Moreover, the synchronization master may specify time, frequency, and phase synchronization for the set of radio nodes. Thus, when the synchronization master is different from the radio node, the radio node synchronizes with the synchronization master.