DVB-T2 PLP Mapping for Signaling Overhead Reduction
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Solution Overview
Problem
DVB systems face limitations in capacity and statistical multiplexing gain due to high signaling overhead and limited Physical Layer Pipes (PLPs) in transmission, particularly in DVB-T2 systems, which affects the efficient delivery of multimedia content, especially for handheld receivers.
Innovation Solution
The method involves mapping service data onto multiple Physical Layer Pipes (PLPs) and organizing them into logical frames of equal size to form a logical channel, reducing signaling overhead by varying the repetition lengths of configuration data items within the frame structure, allowing for efficient transmission and reception of data streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of PLPs is increased to support more services, then service capacity is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the L1-Config signaling information into multiple parts, where each part contains configuration data for a subset of PLPs. This allows the signaling to be distributed across multiple frames rather than concentrated in one large block, reducing the overhead per frame and enabling support for a larger number of PLPs without proportionally increasing signaling burden.
Solution Approach 2:
The patent implements periodic repetition of L1-Config parts across frames, where configuration information is repeated at regular intervals. This periodic structure allows receivers to acquire signaling information efficiently while reducing the average overhead compared to transmitting complete configuration data in every frame.
2Reliability
If L1-Config signaling is transmitted in every frame, then configuration information is reliably delivered, but data capacity is reduced
Solution Approach 1:
The patent extracts only the essential configuration information needed for each PLP subset and places it in dedicated L1-Config parts, separating this signaling data from the main data payload. This extraction allows the signaling to be transmitted in a structured manner that minimizes its impact on overall data capacity while ensuring reliable delivery of necessary configuration parameters.
Solution Approach 2:
The patent makes the L1-Config structure dynamic by allowing different numbers and types of L1-Config parts to be transmitted in different frames based on the actual PLP configuration. This dynamic adaptation enables the system to transmit only the necessary configuration information in each frame, improving data capacity efficiency while maintaining reliability.
3Device complexity
If fixed frame structure is used for transmission, then system simplicity is maintained, but statistical multiplexing gain is limited
Solution Approach 1:
The patent segments the frame structure into standardized components (preamble, L1-Config parts, L1-Dyn, data sections) that can be flexibly combined. This segmentation maintains the simplicity of individual frame elements while enabling complex multiplexing patterns across multiple frames, thereby achieving statistical multiplexing gains without excessive system complexity.
Solution Approach 2:
The patent creates a universal frame structure that can accommodate different numbers of PLPs, different service types, and different configuration requirements through the use of configurable L1-Config parts. This multi-functional framework allows the same basic structure to support diverse multiplexing scenarios, improving statistical multiplexing gain while maintaining system simplicity.
Data Source
AI summary
A method of transmitting data in a wireless communication system is provided. The method comprises mapping service data onto a first set of multiple Physical Layer Pipes (PLPs), mapping the first set of multiple PLPs onto a first set of logical frames, wherein each of the first set of logical frames is of the same size, forming a first logical channel comprising the first set of logical frames, and transmitting the mapped service data over a target delivery system.