Edge Timing for Light Base Stations
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Solution Overview
Problem
Cellular networks face challenges in maintaining reliable and accurate clock synchronization, leading to potential packet loss or network failure due to unreliable clock signals.
Innovation Solution
A cellular network timing system comprising a master base station with a GNSS receiver and local oscillator generating a grandmaster timing signal, which is distributed directly to light base stations and regional data centers, ensuring synchronization of time, frequency, and phase across the network without intermediate relays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If clock signal is distributed through intermediate relays in cellular network, then network coverage is extended, but timing accuracy and reliability deteriorate
Solution Approach 1:
The network is segmented into multiple independent timing domains, each with its own grandmaster clock at the base station level. This allows each segment to maintain independent timing accuracy while covering different geographic areas, resolving the contradiction between extended coverage and timing precision.
Solution Approach 2:
Timing synchronization is performed preliminarily at the base station before signals are transmitted to distributed units. The grandmaster clock at each base station pre-synchronizes all downstream components, ensuring timing accuracy is established before signal distribution across the network.
2Adaptability or versatility
If multiple intermediate components relay timing signals, then network architecture flexibility is improved, but timing reliability and synchronization stability worsen
Solution Approach 1:
The timing signal generation function is extracted from centralized network elements and placed at the edge base stations. Each base station independently generates its own grandmaster timing signals, removing the single point of failure and eliminating cumulative timing errors that would occur through multiple relays.
Solution Approach 2:
The base station acts as an intermediary that generates timing signals locally rather than relaying them from distant central elements. This local intermediary approach maintains architectural flexibility while ensuring timing reliability by eliminating long signal paths and multiple relay points.
3Ease of operation
If centralized timing source is used, then network management is simplified, but vulnerability to single point of failure increases
Solution Approach 1:
Each base station possesses local grandmaster clock capabilities, giving it autonomous timing quality independent of other network elements. This distributed local quality approach maintains management simplicity through standardized interfaces while dramatically improving robustness by eliminating single points of failure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures precise and reliable clock synchronization within the cellular network, preventing packet loss and network failures by directly transmitting the grandmaster timing signal, allowing for quick switching to alternative timing sources in case of issues.
Implementation Method 1
The router may comprise a global navigation satellite system (GNSS) receiver. The router may be configured to generate a grandmaster timing signal based on a signal received by the GNSS receiver
Implementation Method 2
The router may be configured to generate a grandmaster timing signal based on a signal received by the GNSS receiver and a clock signal of a local oscillator
Data Source
AI summary
Arrangements for performing cellular network timing are presented. A light base station which is to serve as a timing grandmaster can be assigned. The master light base station includes a radio unit (RU) and a router, but does not include an onsite distributed unit. The router of the light base station can include a global navigation satellite system (GNSS) receiver. The distributed unit (DU) for the light base station is hosted remotely at a local data center (LDC) that communicates with the master light base station via a network. The master light base station can generate a grandmaster timing signal based on a signal received by the GNSS receiver and a clock signal of a local oscillator. The master light base station can transmit the grandmaster timing signal to LDC that hosts the DU for the master light base station and other light base stations.