Multi-AP Downlink Retransmission for Low-Quality Wi-Fi Links
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Solution Overview
Problem
In multi-Access Point (AP) cooperation scenarios, existing methods fail to efficiently handle downlink data retransmissions, leading to increased transmission delays and packet loss, particularly for stations with low channel quality.
Innovation Solution
A data retransmission method where a first access point device requests a second access point device within the same operation set to retransmit data frames, reducing the number of downlink retransmissions and transmission delays by leveraging multi-AP cooperation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single access point device performs downlink data transmission, then the device complexity is low, but the transmission delay increases and reliability decreases when channel quality is poor
Solution Approach 1:
The patent combines multiple access point devices into a cooperative transmission system where multiple APs work together to transmit downlink data to a station. This merging of resources improves transmission reliability and reduces delay by providing redundant transmission paths and selecting optimal APs based on channel conditions.
Solution Approach 2:
The access point devices in the multi-AP system are designed to perform multiple functions: primary transmission, retransmission, and coordinated cooperation. Any AP in the set can serve as a transmission source, making the system versatile and adaptable to different channel conditions without requiring dedicated specialized devices.
2Loss of time
If traditional retransmission methods are used in multi-AP scenarios, then the system structure is simple, but the transmission delay increases due to additional retransmission rounds
Solution Approach 1:
The patent implements preliminary action by having the access control device pre-arrange the retransmission process. When the primary AP fails to transmit successfully, the AC device has already identified and prepared a secondary AP from the operation set to perform retransmission, eliminating the need for the station to request retransmission and reducing overall transmission delay.
Solution Approach 2:
The system uses feedback mechanisms where the access control device monitors transmission status between APs and stations. Based on this feedback, the AC device dynamically selects appropriate APs for retransmission from the operation set, optimizing transmission efficiency while managing system complexity.
Data Source
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AI summary
The embodiments of the present disclosure provide a data retransmission method and an access point device, capable of achieving downlink data retransmission in a multi-AP cooperation scenario, which can reduce the number of downlink data retransmissions and transmission delay, thereby improving user experience. The data retransmission method includes: transmitting, by a first access point device, first request information when the first access point device fails to transmit a first data frame to a station device, the first request information requesting a second access point device to retransmit the first data frame, and the first access point device and the second access point device belonging to one operation set.