WLAN Data Retransmission Using Subframe Identification Feedback
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Solution Overview
Problem
In wireless local area networks, data frames that are incorrectly received are discarded, leading to the loss of useful information, and existing technologies lack an effective mechanism for hybrid automatic repeat to address this issue.
Innovation Solution
A data retransmission method that includes data block identification information, allowing senders and receivers to identify and retransmit only the incorrectly received data subframes, thereby optimizing resource utilization and improving retransmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a receiver discards incorrectly received frames, then the receiver can maintain simple processing logic, but useful information is lost and retransmission efficiency deteriorates
Solution Approach 1:
The patent extracts and separates the sequence number information from the data frame structure, allowing the receiver to identify and retain only the necessary portions of incorrectly received frames. By extracting the sequence number field and using it to track which subframes need retransmission, the system prevents loss of useful information while maintaining relatively simple processing logic.
Solution Approach 2:
Instead of completely discarding incorrectly received frames, the patent implements a recovery mechanism where the receiver stores these frames in a buffer and attempts to recover useful information through joint decoding with retransmitted subframes. The sequence number tracking system enables identification of which portions can be recovered, transforming a complete discard operation into a selective recovery process.
2Device complexity
If a receiver discards incorrectly received frames, then the receiver can maintain simple processing logic, but retransmission efficiency worsens due to loss of useful information
Solution Approach 1:
The patent implements preliminary action by having the receiver store incorrectly received frames in a buffer before discarding them, and by pre-processing these frames to extract and preserve sequence number information. This preliminary preservation of data allows for efficient joint decoding during retransmission, improving retransmission efficiency without significantly increasing processing complexity.
Solution Approach 2:
The patent implements a feedback mechanism where the receiver sends acknowledgment information back to the transmitter indicating which sequence numbers were correctly received and which need retransmission. This feedback loop enables the transmitter to retransmit only the necessary subframes, improving retransmission efficiency while keeping receiver processing logic relatively simple through automated acknowledgment generation.
3Reliability
If joint decoding is performed on MPDUs with the same Sequence Number from multiple transmissions, then data reliability improves, but the system requires complex mechanisms to track and manage multiple transmissions
Solution Approach 1:
The patent implements a universal sequence number field that serves multiple functions: identifying the MPDU, tracking transmission attempts, and enabling joint decoding. This single sequence number mechanism handles multiple tasks that would otherwise require separate tracking systems, reducing overall system complexity while maintaining the ability to perform joint decoding for improved reliability.
Solution Approach 2:
The patent segments the A-MPDU into individual subframes, each with its own sequence number identifier. This segmentation allows the receiver to track and manage each subframe independently, making it easier to identify which subframes need retransmission and to perform joint decoding on specific segments rather than managing the entire A-MPDU as a single complex unit.
4Reliability
If all subframes in an A-MPDU are retransmitted, then complete data recovery is ensured, but resource wastage increases due to retransmitting correctly received subframes
Solution Approach 1:
The patent implements partial action by retransmitting only the specific subframes that were incorrectly received, rather than retransmitting the entire A-MPDU. The acknowledgment mechanism identifies which sequence numbers correspond to incorrectly received subframes, allowing the transmitter to perform partial retransmission that ensures data recovery completeness for the affected portions while avoiding the resource wastage of retransmitting correctly received subframes.
Solution Approach 2:
The patent uses feedback through acknowledgment frames that contain information about which sequence numbers were correctly received and which need retransmission. This feedback enables the transmitter to make informed decisions about what to retransmit, ensuring complete data recovery for incorrectly received subframes while minimizing resource wastage by excluding correctly received subframes from retransmission.
Data Source
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AI summary
Provided are a data retransmission method and device, a storage medium, and an electronic device. The method includes: transmitting a first data packet, wherein the first data packet comprises data block identification information.