Broadcast Signal Link Layer Packet Segmentation for Transmission Efficiency
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Solution Overview
Problem
Current digital broadcast systems face challenges in data transmission efficiency, robustness, and network flexibility, particularly in mobile and indoor environments, due to the large amounts of video/audio data and additional services they need to handle.
Innovation Solution
A system that supports future hybrid broadcasting using terrestrial networks and the Internet, enabling quality of service control through service characteristics processing, and allowing for flexible transmission of broadcast services over the same radio frequency bandwidth, ensuring error-free reception with mobile devices and in indoor settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If digital broadcast systems transmit large amounts of video/audio data and additional services, then service functionality is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The broadcast system segments data transmission into multiple physical layer pipes (PLPs), each carrying different service types. This allows efficient resource allocation where each PLP can be optimized for its specific service requirements, improving overall transmission efficiency while supporting diverse services including UHDTV, mobile broadcasting, and internet protocol television.
Solution Approach 2:
The system dynamically allocates transmission resources based on service characteristics and channel conditions. Transmission parameters such as modulation scheme, coding rate, and PLP configuration are adaptively adjusted to optimize data transmission efficiency for different service types and reception environments, resolving the contradiction between service versatility and transmission efficiency.
2Adaptability or versatility
If digital broadcast systems handle large amounts of data, then service content is improved, but network robustness deteriorates
Solution Approach 1:
Different PLPs are configured with different robustness characteristics tailored to their specific service requirements. For example, PLPs carrying mobile broadcasting services use more robust modulation and coding schemes, while PLPs for fixed reception can use higher efficiency schemes. This localized optimization maintains network robustness while supporting diverse service content.
Solution Approach 2:
The system employs forward error correction (FEC) coding and redundant transmission mechanisms to cushion against potential transmission errors before they occur. This preemptive protection ensures reliable data delivery even when handling large amounts of service content, maintaining network robustness through advance error prevention measures.
3Ease of operation
If broadcast systems support mobile reception equipment, then reception accessibility is improved, but transmission stability deteriorates
Solution Approach 1:
The system dynamically adjusts transmission parameters based on detected reception environment characteristics. When mobile reception is detected, the system automatically configures PLPs with more robust parameters suitable for mobile conditions, while maintaining stable transmission for fixed reception services. This dynamic adaptation enables broad reception accessibility while preserving transmission stability for each service type.
Solution Approach 2:
The broadcast signal is segmented into multiple PLPs with different robustness characteristics. Some PLPs are specifically configured for mobile reception with higher robustness, while others optimize for fixed reception. This segmentation allows the system to simultaneously support both mobile accessibility and transmission stability for different service types without compromise.
4Quantity of substance
If the same radio frequency bandwidth transmits various broadcast services, then spectrum utilization is improved, but service quality deteriorates
Solution Approach 1:
The radio frequency bandwidth is segmented into multiple orthogonal frequency-division multiplexing (OFDM) subcarriers and time slots, organized into separate PLPs. Each PLP can carry different broadcast services with quality optimized for its specific requirements. This fine-grained segmentation enables high spectrum utilization while maintaining service quality through dedicated resource allocation for each service type.
Solution Approach 2:
Different portions of the spectrum and time resources are allocated with different quality characteristics based on service requirements. High-quality PLPs are allocated sufficient resources for premium services like UHDTV, while more robust PLPs serve mobile and auxiliary services. This localized quality optimization maintains overall service quality while maximizing spectrum utilization across diverse broadcast services.
Data Source
AI summary
A method for transmitting broadcast signals, includes encapsulating input packets including Internet Protocol (IP) packets or Transport Stream (TS) packets into link layer packets in a link layer, each header of the link layer packets including packet type information representing a type of the input packets in a payload of each link layer packet and payload configuration information representing a configuration of the payload of each link layer packet, wherein for a first link layer packet including a single packet, the payload configuration information of the header in the first link layer packet has a value representing that the first link layer packet carries the single packet, the header further includes header mode information representing a length related to the first link layer packet.