Multi-link Device Management Frame Sequence Numbering
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Solution Overview
Problem
Wireless local area network (WLAN) devices face challenges in efficiently communicating management frames across multiple frequency bands, leading to issues with in-order transmission and duplicate detection, especially when devices can only listen to one frequency band at a time but are associated with multiple bands.
Innovation Solution
The implementation of a multi-link device (MLD) framework that ensures in-order transmission and duplicate detection for individually addressed management frames across different frequency bands by using a logical entity with a single MAC address, allowing STAs to operate on multiple frequency bands while following procedures communicated on other bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If devices operate on multiple frequency bands simultaneously, then bandwidth utilization and communication efficiency are improved, but devices can only listen to one frequency band at a time leading to out-of-order transmission and duplicate detection issues
Solution Approach 1:
The patent segments the multi-band communication system into multiple single-link devices (STAs), each responsible for monitoring and receiving frames on specific frequency bands. This segmentation allows the system to maintain reliable in-order delivery on each individual band while still operating across multiple bands simultaneously, resolving the contradiction between bandwidth utilization and reliable delivery.
Solution Approach 2:
The patent introduces a logical entity called a Multi-Link Device (MLD) that acts as an intermediary to coordinate frame delivery across multiple frequency bands. The MLD manages the sequence numbers and coordinates retransmissions across different STAs, ensuring that frames are delivered in order to the upper layers even though individual STAs can only monitor one band at a time.
2Adaptability or versatility
If a single device monitors multiple frequency bands, then communication coverage and versatility are improved, but duplicate frame detection becomes difficult when frames are transmitted out of order
Solution Approach 1:
The patent divides the duplicate detection function across multiple STAs, where each STA maintains its own sequence number counter for its monitored band. This segmentation simplifies the duplicate detection mechanism at each individual STA while collectively providing comprehensive multi-band coverage, as each STA independently tracks frames on its assigned band without needing to understand frames on other bands.
Solution Approach 2:
The patent implements a feedback mechanism where receiving STAs send acknowledgments back to transmitting STAs, and the MLD coordinates retransmissions when duplicates or losses are detected. This feedback loop allows the system to maintain simplicity at the individual STA level while achieving reliable multi-band communication through coordinated feedback across the MLD.
Data Source
AI summary
Methods, apparatuses, and computer readable media for communicating elements between multi-link devices are disclosed. Apparatuses of a first station (STA) affiliated with a multi-link device (MLD) are disclosed, where the apparatuses comprise processing circuitry configured to determine a sequence number as a next sequence number of a sequence number space where the sequence number space is indexed by a MLD media access control (MAC) address of a second MLD, and wherein the processing circuitry is further configured to encode a media access control (MAC) management protocol data unit (MMPDU) in a physical layer (PHY) protocol data unit (PPDU), the MMDPU including the sequence number, a frame body, and an address 1 field, the address 1 field indicating an address of a second station (STA) affiliated with the second MLD, and configure the first STA to transmit the PPDU to the second station.