Cell-Frequency-Link Descriptor for DVB-T2 TFS Mapping
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Solution Overview
Problem
Current digital video broadcast systems, such as DVB-H and DVB-T, face inefficiencies due to insufficient Program Specific Information (PSI) or Service Information (SI) signaling, which results in sub-optimal user experience, high bandwidth costs, and redundancy in transport stream identification, lacking adequate mapping of network-specific parameters with Time Frequency Slicing (TFS) structures.
Innovation Solution
A cell-frequency-link descriptor is introduced, which maps network-specific parameters like cell identifiers, TFS group identifiers, bandwidth, guard interval, transmission mode, and frequency, enabling direct association of TFS groups with cells and their locations, optimizing the mapping of network parameters within the TFS structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If PSI or SI signaling is used to identify transport streams, then service information can be provided, but bandwidth consumption increases and repetition periods become long
Solution Approach 1:
The patent extracts transport stream identification from PSI/SI signaling and places it in the physical layer through the cell_frequency_link_descriptor. This removes the burden of TS identification from higher-layer signaling, allowing PSI/SI to focus on service information while reducing overall bandwidth consumption.
Solution Approach 2:
The patent segments the identification function into two parts: physical layer identification (cell_frequency_link_descriptor) for transport stream identification and higher-layer signaling (PSI/SI) for service information. This segmentation allows each layer to operate efficiently with optimized bandwidth usage.
2Adaptability or versatility
If conventional terrestrial-delivery-system descriptor is used, then transport streams can be mapped with modulation parameters, but the descriptor becomes insufficient for DVB-T2 systems with multiple PLPs
Solution Approach 1:
The patent introduces a dynamic structure where the cell_frequency_link_descriptor can accommodate variable numbers of PLPs and frequencies. The descriptor includes loops for frequencies and PLPs that can be dynamically configured based on system requirements, making it adaptable to different DVB-T2 scenarios while maintaining accurate mapping.
Solution Approach 2:
The cell_frequency_link_descriptor serves multiple functions: it identifies transport streams, maps them to frequencies and PLPs, provides cell location information, and supports handover operations. This multi-functional descriptor replaces multiple separate structures, improving both versatility and reliability.
3Loss of information
If conventional cell-frequency-link descriptor is used, then cell and frequency mapping can be provided, but overhead increases due to lacking frequency loop
Solution Approach 1:
The patent implements a nested structure where frequencies are contained within the cell_frequency_link_descriptor, which itself is nested within the service description table. This nesting eliminates redundant information and reduces overhead by organizing data hierarchically without losing any cell-frequency mapping information.
4Reliability
If transport stream identification is used in physical layer, then modulation parameters can be referenced, but redundancy occurs in DVB-T2 systems
Solution Approach 1:
The patent extracts transport stream identification from the transport stream itself and places it in the physical layer descriptor. This allows modulation parameters to be referenced accurately without redundant identification data in the transport stream, reducing overall data volume while maintaining reliability.
Data Source
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AI summary
Aspects of the invention are directed to a cell-frequency-link descriptor configured to map network-specific parameters with time frequency slicing (TFS) information in a digital video broadcast system. The cell-frequency-link descriptor may include fields that provide a mapping between a cell identifier, a TFS group identifier, a bandwidth, a guard interval, a transmission mode, and a frequency. The fields may provide a mapping between cells, frequencies, TFS groups, related guard intervals, bandwidths, and transmission modes for multiple cells within the digital video broadcast system. The fields may include: a cell identifier field, a TFS-group identifier field, a bandwidth field, a guard interval field, a transmission mode field, a frequency field, a cell identifier extension field, and a transposer frequency field.