Broadcast Frame Preamble Signaling for Robust Layer 1 Control
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Solution Overview
Problem
Conventional wireless communication systems, such as DVB, face inefficiencies in Layer 1 signaling robustness, particularly in mobile environments, leading to issues with service continuity, zapping, and updating, due to lack of time diversity and high power consumption.
Innovation Solution
The method involves generating frames with a preamble containing parity bits for the next frame's payload, enhancing time diversity and error correction through cooperation between Out-of-Band and In-Band signaling, using additional parity bits and individual CRC for improved robustness and error detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If L1 signaling is placed in the preamble at the beginning of a frame without time interleaving, then the signaling structure is simple and easy to decode, but the robustness of L1 signaling is insufficient compared to data robustness
Solution Approach 1:
The patent applies preliminary action by placing a copy of the L1 signaling from the next frame into the current frame's preamble. This allows the receiver to obtain signaling information in advance, improving robustness against fading and interference while maintaining simple decoding structure. The signaling is prepared beforehand and transmitted with the data it describes.
Solution Approach 2:
The patent uses copying by creating a duplicate copy of the L1 signaling information. The signaling for frame N+1 is copied and placed in the preamble of frame N, creating redundancy that improves reliability. This copy mechanism ensures that even if the original signaling in frame N+1 is lost, the receiver can still access it from frame N's preamble.
2Reliability
If L1 signaling is repeated in the current frame for the next frame, then the robustness of L1 signaling is improved, but the overhead is doubled reducing spectral efficiency
Solution Approach 1:
The patent merges L1 signaling with data transmission by placing the signaling information in the preamble, which is already transmitted as part of the frame structure. This combining approach allows signaling to be carried along with data without requiring separate dedicated resources, thereby improving robustness without proportionally increasing overhead.
Solution Approach 2:
The patent applies partial action by selectively repeating only the essential L1 signaling information in the preamble, rather than duplicating the entire frame content. This partial repetition provides sufficient robustness for signaling while minimizing the increase in overhead, achieving a balance between reliability and spectral efficiency.
3Reliability
If IB signaling is used to encapsulate L1 signaling in the data section, then time interleaving provides higher diversity, but it is applicable only for continuous reception not for initial scanning or zapping
Solution Approach 1:
The patent makes the preamble universal by using it for multiple purposes: it carries both the traditional L1 signaling for the current frame and the copied L1 signaling for the next frame. This multi-functional use of the preamble structure enables the system to support both continuous reception (with time diversity) and initial scanning/zapping operations, as the signaling is available early in the frame structure.
Solution Approach 2:
The patent transitions from the time dimension (IB signaling in data section) to the frame structure dimension (preamble placement). By moving signaling to the preamble, it becomes accessible immediately at the start of frame processing, enabling initial scanning and zapping operations while still providing time diversity benefits through the cross-frame copying mechanism.
4Reliability
If additional parity bits are added to the preamble for next frame signaling, then error correction capability is improved, but the preamble size increases
Solution Approach 1:
The patent applies discarding and recovering by using existing preamble resources to carry the copied L1 signaling information. Instead of adding completely new elements, it reuses the preamble structure that already exists in the frame, thereby improving error correction through redundancy without significantly increasing the overall preamble size.
Data Source
AI summary
A method of transmitting data by a transmitter in a broadcast system, a transmission device for transmitting at least one data stream in a broadcast system, a method of receiving data by a receiver in a broadcast system, and a receiving device for receiving data in a broadcast system are provided. The method of transmitting data by a transmission device includes generating a first frame including a preamble and a payload, wherein the preamble comprises first information related to the payload of the first frame and the payload comprises the data; and transmitting the first frame, wherein the preamble includes at least one parity bit for third information related to a payload of a second frame, wherein the second frame is a next frame of the first frame, and wherein the preamble of the first frame comprises second information related to the first information.