NSTR Link Pair Channel Switching via Management Frame Timing
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Solution Overview
Problem
In wireless networks with non-simultaneous transmit and receive (NSTR) link pairs, there are challenges in efficiently performing channel switch operations due to constraints on Beacon and Probe Response frames, leading to difficulties in designating new primary and non-primary links and coordinating channel switching between multiple links.
Innovation Solution
A method and apparatus for an access point (AP) MLD and non-AP MLD to transmit management frames with elements indicating target switching times and estimated resumption times for channel switches, allowing synchronized operation and efficient link management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the NSTR AP MLD designates one link as primary link and the other as non-primary link to avoid IDC interference, then simultaneous transmission and reception is avoided, but the non-AP MLD has difficulty knowing when the AP on the non-primary link resumes BSS operation on the new channel
Solution Approach 1:
The patent segments the information about channel switch resumption into separate elements: a first element indicating the target switch time and a second element indicating the estimated resumption time. This segmentation allows the non-AP MLD to receive specific timing information without requiring continuous Beacon frames on the non-primary link, thus maintaining reliability while reducing information loss.
Solution Approach 2:
The patent applies preliminary action by providing the target switch time and estimated resumption time in advance through management frames before the actual channel switch occurs. This allows the non-AP MLD to prepare for the channel switch and know when to resume BSS operation, eliminating the information gap that would otherwise exist during the transition.
2Productivity
If both the primary link and the non-primary link are needed to switch channels together or swap operating channels, then coordinated channel switching is achieved, but there is a need to efficiently designate a new primary link and non-primary link
Solution Approach 1:
The patent uses feedback mechanisms where the NSTR AP MLD transmits management frames containing target switch time and estimated resumption time information to the non-AP MLD. This feedback loop enables both links to coordinate their channel switching activities efficiently, with the non-AP MLD able to synchronize its switch based on the provided timing information, thereby improving productivity while managing complexity through structured information exchange.
3Reliability
If Beacon frames and Probe Response frames are not transmitted on the non-primary link during channel switch, then IDC interference is avoided, but the non-AP MLD cannot detect when the AP resumes operation on the new channel
Solution Approach 1:
The patent introduces an intermediary solution by using management frames transmitted on the primary link to convey channel switch timing information for the non-primary link. Instead of relying on direct Beacon frame transmission on the non-primary link, the primary link acts as an intermediary carrier of the resumption information, allowing the non-AP MLD to detect AP resumption without requiring continuous Beacon frames on the non-primary link, thus maintaining reliability while improving detectability.
Data Source
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AI summary
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be an access point (AP) multi-link device (MLD). In certain configurations, the AP MLD establishes a primary link on a first channel and a non-primary link on a second channel. The AP MLD determines to perform a channel switch operation to switch a first link of the primary link and the non-primary link to operating on a different channel. The AP MLD transmits, on the primary link and prior to the switching of the first link, a first management frame including a first element indicating a target switching time for the switching of the first link. The AP MLD transmits, on the primary link after the switching of the first link, a second management frame indicating that an AP on the first link is in operation.