Aggregated MAC MPDU Transmission Frame Structure
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Solution Overview
Problem
Current WLAN systems face inefficiencies in data transmission due to delays caused by fragmentation methods and the aggregation of multiple MPDUs, which result in wasted wireless media and transmission delays, necessitating a method to minimize these issues.
Innovation Solution
A method is introduced where service data is divided into multiple MPDUs, formed into a single transmission frame with delimiter information and ACK request information, and a single PHY header is added for transmission, allowing for efficient transmission and error determination without additional time delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple MPDUs are transmitted separately with individual PHY headers, then transmission reliability is maintained, but transmission overhead and time consumption increase
Solution Approach 1:
The patent combines multiple MPDUs into a single aggregated transmission unit with one shared PHY header. This merging approach reduces the total number of headers transmitted and allows multiple data units to be sent in a single transmission opportunity, thereby reducing transmission time while maintaining reliability through the aggregated structure.
2Reliability
If fragmentation method is used to divide service data, then transmission error rate is reduced, but transmission delay and overhead increase
Solution Approach 1:
The patent merges multiple fragmented MPDUs into an aggregated transmission frame, allowing the benefits of fragmentation (error rate reduction) to be maintained while eliminating the cumulative delays and overhead that would result from transmitting each fragment separately with individual headers.
3Reliability
If multiple PHY headers are added for multiple MPDUs, then each MPDU can be independently acknowledged, but wireless media waste and overhead increase
Solution Approach 1:
The patent merges multiple MPDUs under a single PHY header, reducing the total overhead transmitted over the wireless medium. The aggregated structure maintains the ability to track and acknowledge individual MPDUs through delimiters and sequence numbers, while minimizing energy waste by eliminating redundant header transmissions.
4Ease of operation
If separate transmission frames are used for each MPDU, then transmission control is simplified, but system performance and efficiency deteriorate
Solution Approach 1:
The patent merges multiple MPDUs into a single transmission frame with enhanced control mechanisms including delimiters and sequence numbers. This approach maintains transmission control simplicity through a unified frame structure while improving system performance by reducing overhead and enabling more efficient use of wireless transmission resources.
Data Source
AI summary
Provided are a system and method of transmitting an Aggregated Media Access Control (MAC) Protocol Data Unit (A-MPDU) in a Wireless Local Area Network (WLAN) system. A MAC layer divides service data transferred from an upper layer into a plurality of MPDUs, forms a single transmission frame including the sequentially arranged MPDUs, delimiter information for distinguishing each of the MPDUs, and ACK request information for requesting for a reception result of the MPDUs, and transmits the formed transmission frame to a recipient. Accordingly, service coverage is extended, and a transmission delay is minimized, resulting in improved service efficiency.