RoHC Packet Stream Transmission via Separate PLP Channels
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Solution Overview
Problem
Unidirectional transmission systems, such as broadcast systems, face challenges in performing robust header compression (RoHC) initialization procedures due to the lack of negotiation capabilities, necessitating alternative methods for parameter transmission and initialization.
Innovation Solution
A method and apparatus for transmitting and receiving broadcast signals that involve encoding broadcast data, generating RoHC packets, and transmitting fast information including RoHC initialization details through separate channels, enabling RoHC initialization in unidirectional systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If RoHC initialization procedure is performed in unidirectional transmission system, then header compression efficiency is improved, but system complexity increases due to alternative initialization methods
Solution Approach 1:
The patent applies preliminary action by transmitting RoHC initialization parameters (such as static header fields, context information, and compression state) in advance through fast information channels or service announcement messages. This allows the receiver to pre-configure the decompression context before actual broadcast data transmission begins, enabling efficient RoHC decompression without requiring complex negotiation procedures during data transmission.
2Reliability
If broadcast service scan is performed to acquire connection information, then service reception reliability is improved, but service access time increases
Solution Approach 1:
The patent applies preliminary action by including service connection information and RoHC initialization parameters in advance in fast information channels or service announcement messages transmitted before the actual broadcast service data. This allows receivers to quickly acquire necessary configuration information without performing time-consuming sequential frequency scanning, thereby reducing service access time while maintaining reliable service reception.
Solution Approach 2:
The patent uses fast information channels and service announcement messages as intermediaries to transmit critical service connection information and RoHC parameters. These intermediary channels provide a direct path for delivering configuration data without requiring receivers to scan through all possible frequencies and services, thus significantly reducing access time while ensuring reliable information delivery.
3Reliability
If full header is transmitted for each packet, then receiver decoding reliability is improved, but transmission bandwidth efficiency decreases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the level of header information transmitted based on the receiver's context state. Initially, full or partial headers with complete parameter information are transmitted to establish the compression context. Once the receiver is synchronized, only essential parameter changes (such as sequence numbers, timestamps, or modified fields) are transmitted, significantly reducing bandwidth consumption while maintaining decoding reliability through the pre-established context.
Data Source
AI summary
A method for transmitting a broadcast signal includes generating a packet carrying a broadcast service and service signaling information, and a packet carrying fast information for supporting rapid service scans and service acquisition, the fast information including identification information for identifying the broadcast service, service category information representing a category of the broadcast service and hidden information representing whether or not the broadcast service is related to a test service; generating a robust header compression (RoHC) packet by compressing a header of each packet, and signaling information including context information generated from the compressing the header of each packet; and transmitting a RoHC packet stream comprising the RoHC packet through a first Physical Layer Pipe (PLP), and the signaling information through a second PLP which is separate from the first PLP.