Media Gateway Clock Synchronization via Radio Base Stations
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Solution Overview
Problem
Packet-switching networks are unable to synchronize media gateways with the necessary precision for clock-synchronous operation of radio base stations, which prevents seamless roaming or handover between radio base stations in IP-based telecommunication systems.
Innovation Solution
A telecommunication system where a primary media gateway generates a system clock and transmits it along with runtime information to radio base stations, which regenerate and relay the clock to secondary media gateways, enabling synchronization through a network of radio base stations of different types, including type 1, type 2, and type 3, to compensate for processing and cable runtimes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If packet-switching network is used for media gateway connection, then infrastructure cost is reduced by utilizing existing computer network, but synchronization precision deteriorates making clock-synchronous operation impossible
Solution Approach 1:
The patent introduces radio base stations as intermediary devices that receive clock signals from the primary media gateway via radio transmission and relay them to secondary media gateways. This intermediary approach enables synchronization precision that cannot be achieved through packet-switching networks alone, while still utilizing the IP network for initial clock distribution.
Solution Approach 2:
The patent replaces the traditional electrical/cable-based clock signal transmission with radio frequency transmission. By using electromagnetic waves in the radio frequency range, the system achieves precise clock distribution without being constrained by cable running times and physical connection limitations of packet-switching networks.
2Device complexity
If radio base stations are operated without precise clock synchronization, then device complexity is reduced, but roaming and handover functionality deteriorates
Solution Approach 1:
The patent implements self-service synchronization where each radio base station and media gateway automatically receives and adjusts to the clock signal from the primary reference. The devices autonomously synchronize their internal clocks without requiring complex manual configuration or centralized control, achieving precise synchronization while maintaining operational simplicity.
3Device complexity
If cable running times are not compensated, then processing complexity is reduced, but synchronization accuracy deteriorates
Solution Approach 1:
The patent applies preliminary compensation for cable running times and processing delays by calculating these values in advance and incorporating them into the clock signal adjustment. The system pre-determines the total transmission delay through the IP network and radio interface, then compensates for it before the actual clock synchronization occurs, ensuring high accuracy without complex real-time adjustments.
Data Source
AI summary
Telecommunication system based on IP technology, comprising a primary media gateway (1), at least one secondary media gateway (2, 3) to be synchronized onto the primary media gateway (1), and several radio base stations (4-10), at each secondary media gateway (2, 3), at least one radio base station (5, 9) connected to it being provided with a device with which the radio base station (5, 9) can be synchronized onto the emission of another radio base station (4, 8) in order to regenerate the system clock and to transmit it to the connected secondary media gateway (2, 3), and each secondary media gateway (2, 3) being provided with at least one connection for a radio base station (5, 9), through which the regenerated clock can be received and used for controlling the internal clock of the secondary media gateway (2, 3).