Wireless AV Data Transmission Device MAC Header Optimization
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Solution Overview
Problem
Existing wireless AV systems face inefficiencies due to unnecessary overhead in data transmission, particularly in high-definition and ultra-high-definition image data, where conventional wireless communication standards like IEEE 802.11ad and ay include unnecessary control information fields that are not utilized in 1:1 communication scenarios, leading to reduced data transmission rates.
Innovation Solution
A data transmission apparatus and reception apparatus that minimize MAC overhead by encoding media data, fragmenting it into MAC service data units, and generating frame check sequences based on aggregated MAC protocol data units, while supporting backward compatibility with IEEE 802.11ad or ay standards, specifically optimizing the MAC header to include only essential fields like the RA field and QoS field, and mapping wireless AV frame parameters to the EDMG header for efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If IEEE 802.11ad/ay standards are used for wireless AV communication, then signal coverage and throughput are improved, but unnecessary control information fields increase overhead and reduce data transmission efficiency
Solution Approach 1:
The patent extracts and removes unnecessary control information fields from the MAC header that are not needed for 1:1 wireless AV communication. Specifically, fields such as BSSID, DA, QA, and other management-related fields are eliminated, keeping only the essential RA field and QoS field. This extraction principle directly reduces overhead while maintaining communication functionality.
Solution Approach 2:
The patent applies local quality by customizing the MAC header structure specifically for wireless AV applications rather than using the generic IEEE 802.11ad/ay MAC header. The MAC header is locally optimized to include only the fields necessary for AV data transmission (RA field and QoS field), making the header structure adapted to the specific needs of the application.
2Productivity
If MAC header is optimized to include only essential fields, then overhead is reduced and transmission efficiency is improved, but compatibility with existing standards may be compromised
Solution Approach 1:
The patent achieves universality by designing the customized MAC header to maintain compatibility with existing IEEE 802.11ad/ay standards while serving the specific needs of wireless AV communication. The MAC header structure is designed to be universally acceptable by preserving the essential RA field and QoS field that are recognized by standard-compliant devices, ensuring both optimization and compatibility.
3Reliability
If FCS is generated in units of segment based on A-MPDU concept, then error detection capability is improved, but frame structure complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the data transmission into segments with individual FCS fields. Each MAC frame includes its own FCS field that covers the MAC header and frame body, enabling independent error detection for each segment. This segmentation approach improves reliability by allowing selective retransmission of only erroneous segments rather than requiring retransmission of entire aggregated frames.
Data Source
AI summary
The present invention relates to a data transmission device and reception device in a wireless AV system. Disclosed in the present specification is a wireless data transmission device comprising: a processor for generating a compressed bitstream by encoding media data; and a communication unit for segmenting the compressed bitstream, mapping the segmentation results to MSDUs, generating an MPDU frame sequentially including a MAC header, a frame body, and an FCS associated with the MAC header in order to transmit the MSDUs, generating a PPDU frame sequentially, which includes a preamble to which at least a portion of the MAC header is mapped, at least one PPDU to which the frame body and the FCS are mapped, and a TRN field, and transmitting the PPDU frame through a wireless channel. A data transmission rate can be improved through a reduction in overhead information.