Transmission Symbol Assignment for Layered Video Broadcast Reliability
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Solution Overview
Problem
Conventional broadcasting concepts for mobile video transmission in radio networks face challenges in providing reliable broadband wireless video transmission at low transmit power due to lack of individual feedback from subscribers and high error rates caused by frequency-selective multipath channels, which limits coverage and reliability.
Innovation Solution
A transmitter system that assigns transmission symbols to media data streams with different levels of significance, using a first substream for basic quality and a second substream for improved quality, with adaptive radio resource allocation and OFDM transmission, allowing for reduced error probability and flexible data rate balancing, enabling efficient use of radio resources and robust transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional broadcasting concepts are used for mobile video transmission, then coverage area can be extended, but transmission reliability deteriorates due to high error rates from frequency-selective multipath channels
Solution Approach 1:
The video data stream is segmented into multiple substreams with different levels of significance (e.g., base layer and enhancement layers). Each substream is assigned different transmission symbols and radio resources, allowing differential protection against channel errors while maintaining scalable quality across varying coverage areas.
Solution Approach 2:
Different substreams are assigned different modulation schemes and error protection levels according to their importance. Critical substreams use robust modulation (e.g., QPSK) with high error protection, while less critical substreams use higher-order modulation (e.g., 16-QAM or 64-QAM) with reduced protection, optimizing reliability for each data component.
2Use of energy by moving object
If transmit power is reduced to meet mobile device constraints, then energy consumption decreases, but transmission range and reliability deteriorate
Solution Approach 1:
The system dynamically changes transmission parameters including modulation order, coding rate, and resource allocation based on channel conditions and quality requirements. This allows low-power transmission while maintaining reliability for critical data through adaptive parameter optimization.
Solution Approach 2:
By segmenting the data stream into priority-based substreams, the system can allocate power efficiently across different data components, ensuring critical substreams receive sufficient power for reliable transmission while less critical substreams consume minimal power.
3Productivity
If adaptive modulation and resource allocation are implemented, then transmission efficiency improves, but system complexity increases
Solution Approach 1:
The system implements dynamic resource allocation and adaptive modulation where transmission parameters are adjusted in real-time based on channel conditions and quality requirements. This dynamic adaptation optimizes transmission efficiency while managing complexity through standardized adaptation mechanisms.
Solution Approach 2:
Adaptive modulation changes physical layer parameters (modulation order, coding rate) based on channel quality indicators. This parameter adaptation improves transmission efficiency by matching modulation complexity to channel conditions while maintaining manageable system complexity through standardized protocols.
4Adaptability or versatility
If scalable video coding is used to provide multiple quality levels, then adaptability to different channel conditions improves, but coding complexity increases
Solution Approach 1:
Scalable video coding segments the video data into multiple layers (base layer and enhancement layers) with different quality levels. This segmentation enables selective transmission of quality layers based on channel conditions, improving adaptability while managing coding complexity through hierarchical structuring.
Data Source
AI summary
An apparatus for assigning transmission symbols to a media data stream of information symbols is described, the media data stream including a first substream for representing media content in a basic quality and a second substream including additional data for representing the media content, along with the first substream, in an improved quality. The apparatus includes a first assigner for assigning first transmission symbols to the information symbols of the first substream and a second assigner for assigning second transmission symbols to the information symbols of the second substream, the first transmission symbols being transmissible, via a transmission channel, with reduced error probability as compared to the second transmission symbols.