Multi-Carrier Broadcast Frame Segmentation for Mobile Reception
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Solution Overview
Problem
Existing broadcast systems, such as DVB-T2, are optimized for fixed reception and struggle to efficiently support mobile receivers with varying channel bandwidths, leading to challenges in power consumption and robustness, especially when handling larger bandwidths up to 20 MHz.
Innovation Solution
The development of an apparatus and method that maps payload data onto a multi-carrier broadcast system using alternate frame structures, including a first frame structure for stationary receivers and a second frame structure with band segmentation for mobile receivers, allowing for efficient use of narrow-band receivers with low power consumption by segmenting the payload portion into data segments covering a bandwidth portion of the channel bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed channel bandwidth is used for broadcast transmission, then transmission efficiency is improved, but mobile receivers with limited processing power cannot handle larger bandwidths up to 20 MHz
Solution Approach 1:
The payload portion of each frame is segmented into multiple data segments, each covering a specific bandwidth portion of the channel bandwidth. This allows mobile receivers to selectively receive only the data segments within their processing capabilities, enabling support for larger channel bandwidths without requiring the receiver to process the entire bandwidth simultaneously.
2Adaptability or versatility
If different frame structures are used for stationary and mobile receivers, then receiver-specific optimization is improved, but system complexity increases
Solution Approach 1:
The broadcast system transmits a universal frame structure that can be interpreted and processed differently by stationary and mobile receivers. The frame includes a preamble portion and a payload portion that can be segmented into data segments. Stationary receivers can process the entire frame structure, while mobile receivers can selectively process only the data segments within their bandwidth portions, achieving receiver-type optimization without requiring fundamentally different frame structures.
3Use of energy by moving object
If band segmentation is implemented for mobile receivers, then power consumption is reduced, but signaling complexity increases
Solution Approach 1:
The necessary signaling information regarding the segmentation structure, bandwidth portions, and data segment locations is pre-transmitted in the preamble portion of each frame. This allows mobile receivers to acquire the segmentation configuration information in advance, enabling them to efficiently select and process only the relevant data segments without requiring complex real-time signaling or decision-making, thereby reducing power consumption while managing signaling complexity.
Data Source
AI summary
An apparatus and a corresponding method for mapping payload data of mapping input data streams onto a mapping output data stream having a channel bandwidth for transmission in a multi-carrier broadcast system includes first and second frame forming mechanisms. The first frame forming mechanism is adapted to form first frames having a first frame structure and the second frame forming mechanism is adapted to form second frames having a second frame structure. Preferably, in a second frame structure the data blocks of a particular mapping input data stream are spread in time and frequency over various data symbols and various data segments of the second frames to provide high robustness against disturbances. The payload portion of the second frame is preferably segmented into various data segments enabling use of a narrow-band receiver, even if both the first and second frames cover the same total channel bandwidth.