Wi-Fi Backup MPDU Generation for Transmission Delay Reduction
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Solution Overview
Problem
Wi-Fi data transmission is hindered by weak signals and strong interference, leading to increased packet loss and transmission delays, which are exacerbated by the need for retransmissions.
Innovation Solution
A data sending method that involves a sending device with a Wi-Fi chip performing backup processing on target MPDUs by generating backup MPDUs when the retransmission rate exceeds a threshold, and sending multiple copies of these packets to reduce retransmission probability and thereby decrease transmission delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is transmitted through Wi-Fi in weak signal conditions, then data transmission can be maintained, but packet loss increases and transmission delay significantly increases due to retransmissions
Solution Approach 1:
The patent applies preliminary action by performing backup processing on target MPDUs before transmission. When the retransmission rate exceeds a threshold, the system generates backup MPDUs in advance and sends them along with the original MPDU. This ensures that if the original packet is lost during transmission in weak signal conditions, the backup packet is already available at the receiver, eliminating the need for retransmission and thus reducing transmission delay while maintaining reliability
2Reliability
If retransmission is performed when packets are lost, then data reliability is maintained, but transmission delay increases by several times
Solution Approach 1:
The patent applies copying by creating backup copies of MPDUs when the retransmission rate exceeds a threshold. The backup MPDU is generated as a copy of the target MPDU and sent simultaneously with the original. At the receiver, if the original MPDU is lost, the backup copy can be used to reconstruct the data, thereby maintaining delivery reliability without requiring time-consuming retransmission operations
Data Source
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AI summary
Embodiments of this application disclose a data sending method, a sending device, a data receiving method, and a receiving device. The data sending method is applied to the sending device, and includes: obtaining a target medium access control protocol data unit MPDU, where the target MPDU is obtained by performing encapsulation processing on an IP data packet of a specified service, and the sending device and a receiving device are connected through Wi-Fi; obtaining a retransmission rate between the sending device and the receiving device; generating a backup MPDU of the target MPDU if the retransmission rate is greater than a preset retransmission threshold; and sending both the target MPDU and the backup MPDU to the receiving device. For the specified service, in this application, a probability of retransmitting the target MPDU once in a Wi-Fi phase can be reduced by sending a plurality of backups, to reduce a transmission delay of the target MPDU in the Wi-Fi phase.