Aggregated MAC Header Structure for Wireless Frame Overhead Reduction
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Solution Overview
Problem
Current IEEE 802.11 frame transmission methods have significant overhead, particularly at higher traffic conditions, which reduces bandwidth efficiency due to excessive radio level and MAC headers, and existing frame aggregation techniques cannot separately decode individual data units at the physical layer.
Innovation Solution
The proposed A-MPSDU frame structure aggregates multiple MAC protocol data units (MPDUs) or MSDUs into a single packet, using a combined MAC header and delimiters for length information, with conservative modulation coding for the header and optional zero-padding for error protection and alignment, allowing early packet inspection and dropping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple data frames are transmitted separately with individual MAC headers, then each frame can be independently decoded and processed, but the overhead from multiple MAC headers and radio level headers consumes more bandwidth than the payload data at higher traffic conditions
Solution Approach 1:
The patent merges multiple MAC headers into a single aggregated MAC header that contains information for multiple MPDUs. This consolidation reduces the total number of headers transmitted, thereby decreasing overhead and improving bandwidth efficiency while maintaining the ability to deliver multiple data units in a single transmission frame.
Solution Approach 2:
The aggregated MAC header is segmented into multiple sub-headers, each corresponding to a specific MPDU within the aggregation. This segmentation allows the receiver to parse and process individual MPDUs independently based on the segmented header information, preserving independent decoding capability while benefiting from reduced overhead.
2Loss of energy
If a single aggregated MAC header is used for multiple MPDUs, then bandwidth efficiency is improved by reducing overhead, but the ability to separately decode individual constituent data units at the physical layer is lost
Solution Approach 1:
The aggregated MAC header is divided into distinct sub-headers, each associated with a specific MPDU. This segmentation provides clear delimiters and length information that enable the physical layer to identify boundaries between individual data units, allowing separate decoding while maintaining the aggregated structure for efficiency.
Solution Approach 2:
The aggregated MAC header acts as an intermediary structure that bridges the aggregated transmission format and individual MPDU decoding requirements. It contains embedded length and delimiter information that mediates between the consolidated transmission approach and the need for individual unit processing at the physical layer.
3Device complexity
If delimiters are included before each MPDU in the aggregated frame, then physical layer can identify individual data unit boundaries for separate decoding, but the frame overhead increases
Solution Approach 1:
The delimiter function is merged into the aggregated MAC header structure itself. The header contains embedded length fields and boundary information that perform the delimiter function without requiring separate delimiter bytes before each MPDU, thus reducing overhead while maintaining physical layer processing capability.
Solution Approach 2:
The aggregated MAC header serves multiple functions simultaneously: it provides addressing information, length information, delimiter functionality, and segmentation markers. This multi-functionality eliminates the need for separate dedicated delimiter elements, reducing overall frame overhead while enabling physical layer processing.
Data Source
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AI summary
The present disclosure describes a system, method, and computer program product embodiments for processing an A-MPSDU frame structure. An example system can include an interface circuit to combine a plurality of media access control (MAC) headers corresponding to a plurality of media access control service data units (MSDUs) into an aggregated MAC header. The aggregated MAC header can include length information for each of the MSDUs. The interface circuit can also insert the aggregated MAC header into a frame and transmit the frame using an antenna.