Cross-Layer Mobile TV Broadcast Control for Vehicular Reception
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Solution Overview
Problem
Current mobile reception of digital television signals, particularly using the ATSC standard, is challenging due to difficulties in maintaining clear signals at vehicular speeds, necessitating an improved system for transmission and reception to enhance mobility.
Innovation Solution
A digital television broadcast system that dynamically configures transmission and reception parameters based on channel characteristics and user instructions, using cross-layer control to adjust video codecs, error correction, and multiplexing strategies, allowing for robust mobile reception of ATSC signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ATSC digital television signals are transmitted using standard 8-VSB modulation, then high definition video quality is achieved for stationary receivers, but mobile reception becomes difficult or impossible at vehicular speeds
Solution Approach 1:
The patent segments the transmission system into multiple communication layers (physical layer, transport layer, application layer) that can be independently configured and optimized. This allows different modulation and coding schemes to be used for different receiver types (stationary vs. mobile) within the same broadcast system, enabling high definition quality for stationary receivers while providing robust mobile reception for moving devices
Solution Approach 2:
The patent implements dynamic configuration of transmission parameters including modulation type, coding rate, and packet structure based on receiver mobility characteristics. The system can adaptively switch between different communication modes to optimize performance for the current receiver state, allowing the same broadcast system to serve both stationary and mobile devices effectively
2Manufacturing precision
If the transmission system is configured for stationary receivers, then optimal video quality is maintained, but adaptability to mobile devices and changing channel conditions is reduced
Solution Approach 1:
The patent creates a universal broadcast system that can simultaneously serve multiple receiver types (stationary televisions, mobile devices, handheld devices) through a single transmission infrastructure. The system uses multi-functional communication layers that can be configured for different service modes, allowing one system to provide both high definition stationary reception and robust mobile reception without requiring separate broadcast systems
Solution Approach 2:
The patent employs parameter changes in the communication layers to adapt the transmission system for different receiver types and channel conditions. By modifying parameters such as modulation depth, error correction coding, and packet timing, the system maintains optimal video quality for stationary receivers while becoming adaptable to mobile devices with varying mobility characteristics
3Adaptability or versatility
If dynamic configuration of communication layers is implemented, then system adaptability to channel conditions improves, but system complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the transmission system receives information about receiver mobility and channel conditions, then uses this feedback to dynamically adjust communication layer parameters. This closed-loop control enables the system to adapt to changing conditions while keeping the complexity manageable through automated decision-making algorithms that select from pre-defined configuration options
Data Source
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AI summary
A digital television broadcast system with transmission and/or reception of digital television signals for improved mobile reception. The communication layers in the transmit and receive portions of the transmission system can be dynamically modified, e.g., based on usage patterns or current channel characteristics. The transmission system also provides for cross layer control, whereby parameters in various of the communication layers are analyzed to determine appropriate updates to the system configuration.