Broadcast Signal Header Compression for IP Packet Decoding
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Solution Overview
Problem
Current broadcasting systems face inefficiencies in transmitting and receiving IP-based broadcast signals, particularly in reducing overhead and ensuring seamless channel switching and power-on operations in uni-directional transmission environments, where IP packet decoding is hindered by compressed headers.
Innovation Solution
A method involving a broadcast signal transmission processing device that compresses IP packets using a header compression unit, separating full and compressed header packets into different transmission paths, and a receiving device that recovers full headers from signaling packets to restore IP packets, reducing latency and ensuring decoding capabilities during channel switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If IP header compression is applied to reduce overhead in broadcast signals, then transmission efficiency is improved, but the receiving device cannot decode IP packets when switching channels or turning on
Solution Approach 1:
The patent applies preliminary action by transmitting full header information in advance through signaling packets before compressed header packets are received. When a receiver turns on or switches channels, it first obtains the complete header structure through signaling, enabling it to subsequently decode compressed header packets. This preliminary provision of full header information ensures decoding capability is established before compression benefits are utilized.
Solution Approach 2:
The patent introduces an intermediary mechanism by using signaling packets as a mediator between the transmitter and receiver. These signaling packets carry full header information that acts as a reference for decoding compressed packets. The intermediary signaling layer bridges the gap between compression efficiency and decoding reliability, allowing the receiver to reconstruct original IP packets even when receiving only compressed headers during normal operation.
2Reliability
If full header information is transmitted with every IP packet, then decoding reliability is improved, but transmission overhead increases
Solution Approach 1:
The patent applies segmentation by dividing header information transmission into two distinct segments: (1) full header information transmitted periodically through signaling packets, and (2) compressed header packets transmitted with data packets. This segmentation allows the system to send complete header structures only when necessary (channel switch, power on, or periodic updates) rather than with every packet, significantly reducing overall transmission overhead while maintaining decoding reliability.
Solution Approach 2:
The patent changes the parameter of header information completeness dynamically. Instead of consistently transmitting full headers, the system adjusts the header information parameter based on operational context: full headers are transmitted when the receiver needs initial context (power on, channel switch) or periodically for updates, while compressed headers are used during stable operation. This parameter change optimizes the balance between reliability and overhead.
3Device complexity
If compressed header packets are transmitted through the same path as broadcast data, then device complexity is reduced, but header information may be lost during channel switching
Solution Approach 1:
The patent uses signaling packets as an intermediary channel specifically for transmitting full header information, separate from the data transmission path. This intermediary signaling path ensures that complete header context is delivered reliably even when the receiver switches channels or experiences data path interruptions. The signaling path acts as a dedicated information delivery mechanism that complements the compressed data path.
Data Source
AI summary
A broadcast signal transmission processing apparatus, includes a header compression processor that generates a first packet including first header information in a uncompressed form and second packets including second header information in a compressed form by performing header compression on Internet protocol (IP) packets containing broadcast data, a header information extracting processor that extracts the first header information from the first packet and converts the first packet from which the first header information is extracted to a third packet including third header information in a compressed form, a signaling data generating processor that generates signaling packets containing information related to the header compression and mapping information between the IP packets and at least one data pipe for the IP packets, and a broadcast signal transmitting processor that transmits a broadcast signal including multiple data pipes that include at least one data pipe.