Broadcast Signal Transmission Using PLP Segmentation and Dynamic Stuffing
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Solution Overview
Problem
Current digital broadcast systems face challenges in efficiently transmitting large amounts of data, ensuring robustness, and flexibility, especially in mobile reception environments, due to limitations in data transmission efficiency and network robustness.
Innovation Solution
The proposed solution involves an apparatus and method for transmitting and receiving broadcast signals by processing input streams into Base Band (BB) frames, encoding data using Physical Layer Pipes (PLPs), and modulating it using Orthogonal Frequency Division Multiplexing (OFDM), with features like stuffing fields and indicators for data composition, to enable efficient transmission of multiple services over the same RF signal bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If digital broadcast signals include larger amounts of video/audio data and additional data, then broadcast service functionality is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The patent segments the broadcast data into multiple PLPs (Physical Layer Pipes) with different priorities and characteristics. Each PLP can be independently modulated and transmitted, allowing efficient resource allocation. The segmentation of data into structured frames with headers enables systematic processing and transmission optimization.
Solution Approach 2:
The patent changes transmission parameters dynamically by adjusting modulation schemes, coding rates, and frame structures based on channel conditions and service requirements. Stuffing fields are added or removed to optimize frame utilization, and MIMO configurations are adjusted to match signal quality, thereby improving transmission efficiency for large data volumes.
2Quantity of substance
If digital broadcast system provides HD images, multi-channel audio and additional services, then service quality is improved, but network robustness deteriorates
Solution Approach 1:
The patent implements error correction coding (LDPC codes) and adds redundancy data beforehand to protect against transmission errors. Stuffing fields are strategically placed to maintain frame structure integrity, and MIMO diversity is prepared in advance to provide robustness against fading and interference, ensuring reliable delivery of HD and multi-channel data.
Solution Approach 2:
Different portions of the broadcast data receive different levels of protection based on their importance. Critical service data is transmitted through more robust PLPs with stronger error correction, while less critical data uses more efficient but less protected transmission modes. This localized quality adjustment maintains overall system robustness while maximizing service capability.
3Adaptability or versatility
If digital broadcast system considers mobile reception equipment, then reception flexibility is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The patent employs dynamic MIMO configurations that can adapt to mobile reception conditions. The system switches between different MIMO modes (transmit diversity, spatial multiplexing) based on channel quality, and adjusts PLP allocations dynamically. Stuffing field lengths are varied to optimize frame structures for different mobility scenarios, maintaining efficiency while supporting mobile flexibility.
4Adaptability or versatility
If stuffing fields are added to BB frames for data composition flexibility, then frame structure adaptability is improved, but transmission overhead increases
Solution Approach 1:
The patent dynamically adjusts stuffing field parameters based on the actual data payload requirements. When data perfectly fills frames, stuffing is minimized or eliminated. When data alignment or structure flexibility is needed, stuffing is added strategically. The header information is optimized to efficiently describe the variable frame composition, reducing overhead while maintaining adaptability.
Data Source
AI summary
A method and an apparatus for transmitting broadcast, signals thereof are disclosed. The method for transmitting broadcast signals includes processing input streams into BB frames in PLPs; encoding data of the PLPs; building at least one signal frame by mapping the encoded data of the PLPs; and modulating data in the built signal frame by OFDM method and transmitting the broadcast signals having the modulated data, wherein at least one of the BB frames includes a stuffing field and a first indicator describing whether the stuffing field is included in the BB frame.