Multi-Link WLAN Data Packet Retransmission via Spatial Redundancy
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Solution Overview
Problem
Data packet transmission blocking occurs more frequently in multi-link WLAN systems compared to single-link systems, especially when a data packet with a small sequence number fails, causing subsequent packets to be delayed or dropped until retransmission succeeds or the packet is dropped.
Innovation Solution
A method and device for duplicating a failed data packet with the smallest sequence number in a transmission window to other links and retransmitting it on multiple links, including predicting a data packet full condition to optimize retransmission, thereby improving the chances of successful retransmission and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data packet aggregation is allowed in a multi-link system, then data transmission efficiency is improved, but data transmission blocking occurs more frequently
Solution Approach 1:
The patent extends the transmission dimension from a single link to multiple links. When a data packet fails on one link, the system can retransmit it on alternative links, effectively adding spatial redundancy to the transmission process. This multi-dimensional approach allows the system to maintain high throughput while reducing blocking by providing alternative transmission paths.
Solution Approach 2:
The patent dynamically adjusts transmission parameters including window size, aggregation level, and retransmission strategies based on link conditions. By changing these parameters adaptively, the system optimizes the balance between transmission efficiency and blocking prevention, allowing aggressive aggregation when conditions are good and conservative retransmission when failures occur.
2Reliability
If retransmission of a failed data packet is performed, then transmission reliability is improved, but transmission latency increases
Solution Approach 1:
The patent prepares alternative transmission paths and resources in advance by establishing multiple links before transmission begins. When a failure occurs, pre-configured alternative links are immediately available for retransmission, eliminating the need for time-consuming path discovery and resource allocation during the retransmission process.
Solution Approach 2:
The patent creates copies of failed data packets and distributes them across multiple links for parallel retransmission. Instead of retransmitting a single packet sequentially, the system generates and sends duplicate copies through different links simultaneously, significantly reducing the time required to achieve successful delivery.
3Productivity
If transmission window size is increased to improve throughput, then data transmission speed is improved, but data packet full condition occurs more frequently
Solution Approach 1:
The patent divides the transmission window into multiple segments or sub-windows that can be managed independently. Instead of treating the entire window as a single block, the system can selectively advance, pause, or retransmit individual segments based on their specific status, reducing the complexity of managing large windows while maintaining high throughput.
Data Source
AI summary
A data packet transmission method and device, a storage medium and a terminal are provided. The method includes: during multi-link transmission, duplicating a first failed data packet in a transmission window to at least one other link of multiple links, wherein the multiple links include a first link on which the first failed data packet is transmitted and the at least one other link; and retransmitting the first failed data packet on the at least one other link and the first link, wherein the first failed data packet is a data packet whose transmission does not succeed and which has a smallest sequence number in the transmission window. Embodiments of the present disclosure may mitigate data packet transmission blocking caused by failed data packets in a WLAN multi-link system.