L1 Signaling for Physical Layer Pipe Alignment
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Solution Overview
Problem
Current broadcasting communication systems face challenges in providing improved performance and supporting various receiving methods for high-quality digital services, particularly in aligning and processing Physical Layer Pipes (PLPs) across different layers in a way that ensures efficient transmission and reception of diverse information.
Innovation Solution
A transmitting apparatus and method that generate and transmit L1 signaling, including information on the alignment state and offset of starting positions of PLPs, to facilitate accurate alignment and processing of PLPs in the receiving apparatus, enabling efficient signal processing and improved service delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If L1 signaling includes detailed information on PLP alignment state and offset for multiple layers, then the receiving apparatus can accurately align and process PLPs, but the complexity of signaling generation and processing increases
Solution Approach 1:
The L1 signaling is segmented into distinct fields: a first field indicating whether PLP starting positions are aligned across layers, and a second field providing offset information when misalignment occurs. This segmentation allows the receiver to efficiently process only the necessary information based on the alignment state, reducing overall processing complexity while maintaining precise alignment capability.
Solution Approach 2:
The alignment state information is provided in advance in the L1 signaling before the actual PLP data processing. The receiver can preliminarily determine whether alignment processing is needed based on the first field, and only then proceed to apply offset corrections using the second field if necessary, optimizing the processing flow.
2Adaptability or versatility
If the system supports various receiving methods for high-quality digital services, then the versatility and service quality improve, but the difficulty of detecting and measuring PLP parameters increases
Solution Approach 1:
The L1 signaling acts as an intermediary that carries pre-processed alignment state and offset information from the transmitter to the receiver. This intermediary provides the receiver with ready-to-use parameters without requiring complex detection and measurement processes, thereby supporting various receiving methods while reducing the difficulty of parameter acquisition.
3Manufacturing precision
If the L1 signaling includes comprehensive PLP arrangement information, then the signal processing accuracy improves, but the amount of signaling data and processing load increase
Solution Approach 1:
The L1 signaling provides localized quality information by including a first field that indicates specifically whether alignment is present, and a second field that provides offset information only when needed. This local quality approach ensures precise signal processing where necessary while minimizing the overall signaling data quantity by not transmitting redundant alignment information when PLPs are already aligned.
Data Source
AI summary
A transmitting apparatus is provided. The transmitting apparatus includes at least one processor configured to implement: an L1 signaling generator configured to generate L1 signaling; a frame generator configured to generate a frame having a payload in which a plurality of Physical Layer Pipes (PLPs) are included; and a signal processor configured to transmit the frame by adding a preamble including the L1 signaling in the frame. The L1 signaling includes first information representing an alignment state of starting positions of PLPs included in different layers among the plurality of PLPs and second information representing at least one offset of the starting positions. Accordingly, the preamble includes the L1 signaling including information on an arrangement order of the plurality of PLPs included in the payload.