Network Access Unit Video Load Balancing
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Solution Overview
Problem
Existing communication systems face challenges in maintaining high availability and quality of services across multiple terminals with varying link conditions and capabilities, leading to a trade-off between bandwidth efficiency and service quality due to the need for lower order modulation and coding schemes to ensure reliable transmission.
Innovation Solution
A network access unit configured to receive link condition and configuration data, calculate priority, and generate a master schedule to dynamically adjust transmission parameters, using pre-coding schemes and adaptive coding and modulation (ACM) to optimize transmission for each terminal, allocating bandwidth efficiently between single and multi-layer transmissions based on terminal capabilities and network congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lower order modulation and coding schemes are used to ensure reliable transmission for terminals with worst link conditions, then availability is improved, but bandwidth efficiency deteriorates
Solution Approach 1:
The video data is segmented into multiple layers (first layer, second layer, third layer) with different coding and modulation schemes. The first layer uses lower order schemes for reliable transmission to terminals with worst link conditions, while the second and third layers use higher order schemes for better bandwidth efficiency. This segmentation allows the system to serve multiple terminal types simultaneously without sacrificing either availability or bandwidth efficiency.
Solution Approach 2:
Different portions of the video data are assigned different coding and modulation characteristics based on their importance and the needs of different terminal types. Critical data for reliable reception uses lower order modulation, while enhancement data uses higher order modulation. This local differentiation resolves the contradiction by allowing each data portion to be optimized for its specific function.
2Productivity
If higher order modulation and coding schemes are used to improve bandwidth efficiency, then quality of service is improved, but availability deteriorates
Solution Approach 1:
The transmission is divided into multiple layers where the first layer uses lower order modulation for availability and the second layer uses higher order modulation for bandwidth efficiency. Terminals with worse link conditions can receive and decode only the first layer, while terminals with better link conditions can receive and decode both layers, thus achieving both availability and bandwidth efficiency simultaneously.
Solution Approach 2:
The system transmits more data than a single terminal might need (excessive action) by including multiple layers. Terminals with worse link conditions can partially receive and decode only the essential first layer, while terminals with better conditions can utilize the additional second layer for enhanced quality. This partial reception approach resolves the contradiction by ensuring minimum availability for all terminals while providing enhanced quality for capable terminals.
3Device complexity
If a single coding and modulation scheme is used for all terminals to simplify the system, then device complexity is reduced, but adaptability to different link conditions deteriorates
Solution Approach 1:
The transmission system is segmented into multiple layers with different coding and modulation schemes, allowing the network access unit to adapt to different terminal capabilities. The controller selectively transmits different layers based on terminal type and link conditions, providing adaptability without requiring each terminal to handle all possible modulation schemes.
Solution Approach 2:
The system dynamically adapts the transmission strategy by selecting which layers to transmit based on real-time link condition data and terminal capability information. The controller adjusts the transmission parameters dynamically, switching between different coding and modulation schemes as needed, thus achieving adaptability while managing system complexity through centralized control.
Data Source
AI summary
A network access unit includes: a source data receiver module to receive multiple first source data representing video content and second source data representing broadband data content; a network control module to generate a master schedule indicating whether each first source data is to be transmitted with one or two layers; a pre-coder module to pre-code each first source data using a first pre-coding scheme to generate a first set of representation data, and if the first source data is to be transmitted with two layers, to pre-code the first source data using a second pre-coding scheme to generate a second set of representation data; and an ACM module to associate each first set of representation data with a first coding and modulation scheme, and associate, for each first source data to be transmitted with two layers, the second set of representation data with a second coding and modulation scheme.