Automatic Transmission Delay Planning for SFN Broadcasting Networks
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Solution Overview
Problem
Current methods for managing transmission time delays in wireless broadcasting networks, particularly for DVB-H standards, fail to ensure optimal reception quality and dense coverage over extensive territories with minimal interference, due to limitations in existing tools for adjusting delays and handling interference caused by propagation differences.
Innovation Solution
A method and system for automatically planning transmission time delays in a time and frequency synchronous wireless broadcasting network, using a computing system that processes geographical data, population information, and signal attenuation laws to calculate and adjust delays for each transmitter, minimizing interference and optimizing coverage by distributing delays between 0 and 1 ms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple transmitters broadcast simultaneously on the same frequency to achieve dense coverage, then coverage area is improved, but interference between transmitters increases
Solution Approach 1:
The patent applies preliminary action by calculating and pre-determining optimal transmission time delays for each transmitter before actual broadcasting occurs. The system computes delay values based on geographical positions, population data, and propagation characteristics, then implements these delays in advance to prevent interference during simultaneous transmissions across the coverage area.
Solution Approach 2:
The patent changes the temporal parameter of transmission by introducing variable time delays (between 0 and 1 ms) for different transmitters. This parameter modification allows multiple transmitters to broadcast on the same frequency while staggering their actual transmission moments, thereby reducing interference in populated areas while maintaining broad coverage.
2Object-affected harmful factors
If transmission time delays are manually adjusted for each transmitter, then interference in specific areas can be reduced, but network management complexity increases
Solution Approach 1:
The patent implements self-service by enabling the network management system to automatically calculate and determine optimal transmission delays for all transmitters without requiring manual intervention. The system uses algorithms that process geographical data, population information, and propagation models to autonomously compute delay values, thereby reducing interference while simplifying network management.
Solution Approach 2:
The patent incorporates feedback mechanisms where the system continuously monitors reception quality and interference levels, then adjusts transmission delays accordingly. The automatic planning system uses feedback from network performance data to refine delay calculations and optimize broadcast timing across different transmitters and geographical locations.
3Ease of manufacture
If transmission delays are not optimized, then network setup is simpler, but reception quality in populated areas deteriorates
Solution Approach 1:
The patent modifies the transmission timing parameter by introducing controlled delays (0 to 1 ms) that are automatically optimized based on population distribution and propagation characteristics. This parameter adjustment improves reception quality in populated areas by preventing interference while maintaining simple network setup procedures through automated delay calculation.
Solution Approach 2:
The system performs preliminary calculations of optimal delays during the network planning phase using geographical and population data. This advance computation ensures that reception quality is optimized from the outset without requiring complex real-time adjustments, thereby maintaining ease of network deployment while improving reliability in populated areas.
Data Source
AI summary
The system for automatic planning of delays in a network (N) of SFN type comprises:means initiating an OFDM transmission for each radio transmitter (4), inter-symbol delays being provided;a calculation module processing network data and determining figures of populations located in zones with interference;control means and initiation means to delay transmission at each transmitter, with a delay varying between 0 and 1 ms;delay adjustment means linked to the control means for combinations of delays for all transmitters.The module (11) recalculates the figures of populations located in interference zones for successive combinations of delays, and configuration means (13) of the system provide the number of permitted iterations. The optimal combination is obtained when said estimated population figures are minimum.