Multi-Link Retransmission Control for Undelivered Wireless Data
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Solution Overview
Problem
Existing multi-link communication systems struggle with efficient retransmission of undelivered data due to sequence number management issues and interference, leading to prolonged data transmission times, especially in multi-link operations like IEEE 802.11ax and 802.11be.
Innovation Solution
A communication device and method that utilize a multi-link management unit to retransmit undelivered data using available links, with early acknowledgment information and frame aggregation to manage sequence numbers across multiple links, ensuring timely retransmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data retransmission is performed using the same link where undelivered data was transmitted, then retransmission reliability is maintained, but transmission time is prolonged and link resources are inefficiently utilized
Solution Approach 1:
The patent transitions from single-link retransmission to multi-link retransmission by introducing a spatial dimension (additional links) to the retransmission process. When data fails to be delivered on a predetermined link, the system utilizes another available link for retransmission, effectively adding a dimensional approach to solve the time and resource efficiency problem while maintaining reliability.
2Device complexity
If sequence numbers are managed independently for each link, then link-specific data tracking is simplified, but undelivered data across multiple links cannot be efficiently identified and retransmitted
Solution Approach 1:
The patent merges the sequence number management across multiple links by having the multi-link management unit track undelivered data sequences globally. Instead of independent per-link sequence management, the system combines tracking across links to identify which specific data sequences need retransmission, enabling efficient cross-link data recovery while maintaining manageable complexity through centralized coordination.
3Device complexity
If reception acknowledgment information is returned on the same link used for data transmission, then acknowledgment delivery is simple, but interference occurs and transmission time is extended
Solution Approach 1:
The patent segments the communication process into distinct transmission and acknowledgment phases across different links. Data transmission occurs on one link while acknowledgment information is returned on another link, separating these functions spatially to avoid interference and reduce transmission time. This segmentation allows parallel operations and eliminates the bottleneck of sequential transmission-acknowledgment cycles on the same link.
Data Source
AI summary
A communication device that enables more suitable retransmission of undelivered data in communication using a plurality of links. A transmission side communication device controls parallel transmission of data using the plurality of links in a wireless network, and sets retransmission of undelivered data using available links when the undelivered data is generated on a predetermined one of links. A reception side communication device controls parallel reception of data using the plurality of links in the wireless network, sets reception acknowledgment information including information specifying the reception situation of the data in the other link when returning reception acknowledgment information on one of the links, and controls the return of the reception acknowledgment information to set up links to receive retransmission data.