Broadcast Signal RoHC Context Signaling for Reliable Packet Recovery
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Solution Overview
Problem
Current digital broadcast systems face inefficiencies in data transmission due to high overhead in IP/UDP/RTP header fields, particularly in wireless systems with limited bandwidth, where Robust Header Compression (RoHC) is necessary but can fail if the decompressor lacks initial context information, leading to incomplete packet recognition by receivers.
Innovation Solution
A method is introduced to transmit and receive broadcast signals using RoHC packet streams by separating metadata and real data into different channels, allowing for independent transport of RoHC-related metadata and ensuring packet recovery regardless of receiver access time, using a signaling packet to convey necessary information for decompression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RoHC compression is applied to reduce header overhead, then data transmission efficiency is improved, but packet recovery reliability deteriorates when decompressor lacks initial context information
Solution Approach 1:
The patent transmits RoHC metadata (context information) in advance through signaling packets before the actual compressed data arrives. This preliminary action ensures that the decompressor has the necessary context information ready before receiving compressed packets, enabling reliable decompression without failures. The metadata transmission is performed ahead of time through separate signaling channels, allowing the receiver to initialize its decompression context properly.
Solution Approach 2:
The patent separates the transmission of RoHC metadata and actual compressed data into different channels. The metadata (context information) is transmitted through signaling packets on one channel, while the compressed data flows through another channel. This segmentation allows independent handling of context initialization and data decompression, ensuring that missing metadata doesn't compromise the entire transmission.
2Device complexity
If all RoHC metadata is transmitted through the same channel as compressed data, then device complexity is reduced, but transmission robustness deteriorates due to potential simultaneous loss
Solution Approach 1:
The patent divides the transmission system into multiple independent channels: one for signaling packets containing RoHC metadata and another for compressed data. This segmentation ensures that metadata and data can be transmitted independently, so if one channel experiences loss or delay, the other remains unaffected. The receiver can reconstruct packets as long as it receives the metadata, even if some compressed packets are lost.
3Manufacturing precision
If receiver waits for complete context initialization before processing data, then decompression accuracy is improved, but access time increases for mobile receivers
Solution Approach 1:
The patent sends RoHC metadata through signaling packets in advance, allowing the receiver to initialize its decompression context before the actual compressed data arrives. This preliminary context setup enables the receiver to start processing compressed packets immediately upon receipt, without waiting for additional initialization data, thus reducing access time while maintaining decompression accuracy.
Solution Approach 2:
The patent enables dynamic adaptation where the receiver can process data at different stages of context initialization. By receiving metadata through signaling packets, the receiver can dynamically adjust its processing state, allowing mobile receivers to access content more quickly while still achieving accurate decompression when full context is available.
Data Source
AI summary
A method for transmitting a broadcast signal, includes compressing headers of Internet Protocol (IP) packets in an IP packet stream to output a compressed IP packet stream, the compressed IP packet stream including Initialization Refresh (IR) packets, a first group of IR-dynamic packets, and compressed IP packets; extracting context information from the compressed IP packet stream, wherein when the context information is extracted only from the IR packets in the compressed IP packet stream, the IR packets are converted to a second group of IR-dynamic packets; building signaling information including the context information; and encapsulating the signaling information into one or more signaling link layer packets and the compressed IP packet stream into link layer packets that are distinct from the one or more signaling link layer packets.