OFDM Broadcast Signal Interleaving for QoS-Aware Multi-Service Reception
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Solution Overview
Problem
Current digital broadcast systems face challenges in data transmission efficiency, robustness, and network flexibility, particularly in handling large amounts of data and ensuring error-free reception, especially with mobile or indoor equipment.
Innovation Solution
The method involves encoding service data, mapping it into OFDM symbols, frequency interleaving using a variable interleaving seed based on cyclic shifting and FFT size, and modulating the data for transmission, allowing for multiple services to be transmitted through the same RF signal bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If digital broadcast signals transmit large amounts of video/audio data and additional data, then service quality and functionality are improved, but data transmission efficiency and network robustness deteriorate
Solution Approach 1:
The patent segments data into multiple data pipes (DP0-DP7) with different priorities and service types. Each data pipe handles specific traffic types (e.g., DP0 for signaling, DP1 for video, DP2 for audio), allowing efficient multiplexing and prioritization. This segmentation enables the system to manage large data volumes while maintaining transmission efficiency through selective resource allocation and QoS control.
2Quantity of substance
If digital broadcast signals transmit large amounts of video/audio data and additional data, then service quality and functionality are improved, but network robustness deteriorates
Solution Approach 1:
The patent implements dynamic resource allocation where data pipes can be activated or deactivated based on service requirements. The system dynamically adjusts the number and configuration of data pipes to match traffic demands, enabling robust adaptation to varying network conditions while maintaining reliable transmission of large data volumes.
3Adaptability or versatility
If multiple different broadcast services are transmitted through the same RF signal bandwidth, then network flexibility and resource utilization are improved, but service quality and reliability may deteriorate
Solution Approach 1:
The patent assigns different quality characteristics to different data pipes based on their service requirements. High-priority services (e.g., signaling in DP0, video in DP1) receive enhanced protection and resource allocation, while lower-priority services use remaining resources. This local quality differentiation ensures that service quality is maintained for critical applications even when multiple services share the same RF bandwidth.
Data Source
AI summary
A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals comprises an encoder for encoding service data, a mapper for mapping the encoded service data into a plurality of OFDM (Orthogonal Frequency Division Multiplex) symbols to build at least one signal frame, a frequency interleaver for frequency interleaving data in the at least one signal frame by using a different interleaving-seed which is used for every OFDM symbol pair comprised of two sequential OFDM symbols, a modulator for modulating the frequency interleaved data by an OFDM scheme and a transmitter for transmitting the broadcast signals having the modulated data, wherein the different interleaving-seed is generated based on a cyclic shifting value and wherein an interleaving seed is variable based on an FFT size of the modulating.