Wireless AV Data Transmission Overhead Reduction
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Solution Overview
Problem
Current wireless AV systems face inefficiencies due to unnecessary overhead in data transmission, particularly in high-definition and ultra-high-definition image data, where existing standards like IEEE 802.11ad and ay include control information fields that are not utilized in 1:1 communication scenarios, leading to reduced communication performance.
Innovation Solution
The proposed solution involves a data transmission apparatus and reception apparatus that optimize communication performance by reducing MAC and PHY data overhead through the use of a frame check sequence (FCS) in units of segments based on the aggregated MAC protocol data unit (A-MPDU) and short aggregated MAC service data unit (A-MSDU), while maintaining backward compatibility with IEEE 802.11ad and ay standards, and minimizing MAC dummy fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing IEEE 802.11ad/ay standards are used for wireless AV communication, then communication coverage and device compatibility are ensured, but unnecessary control information fields in MAC and PHY layers increase overhead and reduce transmission efficiency
Solution Approach 1:
The patent extracts and removes unnecessary control information fields from the MAC header and PHY preamble that are not needed for 1:1 wireless AV communication. Specifically, it eliminates fields such as BSSID, TA, and other management-related control information while retaining essential fields like FC, duration, and RA, thereby reducing overhead without compromising communication functionality.
Solution Approach 2:
The patent segments the MAC data unit into essential and non-essential components, allowing selective transmission of only the necessary control information. This segmentation enables the system to transmit a streamlined MAC header containing only critical fields required for 1:1 communication, separating useful control information from redundant overhead.
2Adaptability or versatility
If standard MAC header formats are used, then compatibility with existing wireless standards is maintained, but unnecessary control fields increase data transmission overhead
Solution Approach 1:
The patent applies local quality by customizing specific fields within the MAC header according to the actual needs of wireless AV communication. It modifies the MAC header structure locally by setting certain field lengths to zero (e.g., BSSID field length set to 0) or removing specific fields entirely, while maintaining the overall standard-compliant structure for essential fields.
Solution Approach 2:
The patent introduces dynamic field configuration where the MAC header structure can be adaptively adjusted based on communication mode. In 1:1 wireless AV communication, the header is optimized to contain only necessary fields, while the structure remains capable of supporting standard formats when needed, providing dynamic adaptability between standardized and optimized modes.
3Reliability
If complete MAC and PHY frame structures are transmitted, then protocol compliance is ensured, but transmission time and bandwidth are wasted on unnecessary fields
Solution Approach 1:
The patent performs preliminary optimization of the MAC and PHY frame structures before transmission by pre-configuring them to contain only the essential fields required for wireless AV communication. This preliminary action eliminates the need to transmit redundant control information, reducing transmission time while maintaining protocol compliance for the essential remaining fields.
4Manufacturing precision
If high-definition and ultra-high-definition image data are transmitted, then image quality is improved, but the amount of data to be transmitted increases leading to higher transmission costs
Solution Approach 1:
The patent changes the parameter of control information field lengths and structures to optimize for high-definition and ultra-high-definition image data transmission. By reducing the size and number of control fields in MAC and PHY layers, it minimizes the overhead proportion relative to the large payload size of HD/UHD video data, thereby reducing effective transmission costs while maintaining high image quality.
Data Source
AI summary
The present disclosure relates to a transmission device and reception device for data in a wireless AV system. The transmission device comprises: a processor for encoding media data thereby generating a compressed bitstream; and a communication unit for: fragmenting the compressed bitstream and mapping the compressed bitstream to an MSDU; generating, for transmission of the MSDU, an MPDU frame sequentially comprising an MAC header, a frame body, and an FCS for the MAC header; generating, for the transmission of the MPDU frame, a PPDU sequentially comprising a preamble, at least one PSDU, and a TRN field; and transmitting the PPDU frame through a radio channel. A radio resource for transmission of actually necessary data can be secured by minimizing unnecessary overhead information (i.e., control-related information in the MAC header) from among data transmitted over radio.