Multi-Link WLAN Parameter Updates Under Adjacent-Link Interference
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Solution Overview
Problem
Existing wireless LAN technologies face challenges in defining detailed operations for multi-link operations, particularly when signal interference between adjacent links hinders simultaneous transmission and reception, leading to issues with parameter updates.
Innovation Solution
A method involving the transmission of frames with updated parameters through multiple links, including beacon and probe response frames, to ensure parameter updates are received by devices, even when simultaneous transmission and reception are not possible, using transmission prohibition periods to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-link operations are performed with adjacent links, then communication throughput is improved, but signal interference between links increases preventing simultaneous transmission and reception
Solution Approach 1:
The patent segments the communication system into multiple independent links (first link and second link) that can operate semi-independently. Each link maintains its own parameter set and transmission timing, allowing the system to achieve multi-link throughput while managing interference through separate control mechanisms for each link segment.
Solution Approach 2:
The patent implements dynamic parameter updates where transmission parameters (such as modulation and coding schemes) are adjusted based on real-time channel conditions and interference levels. The system dynamically switches between different parameter sets to optimize throughput while avoiding interference conflicts between adjacent links.
2Device complexity
If parameter updates are transmitted only through the first link, then transmission simplicity is maintained, but reliability of parameter updates decreases when simultaneous reception is blocked by interference
Solution Approach 1:
The patent introduces a second link as an intermediary channel for parameter update transmission. When the first link cannot deliver parameters reliably (due to interference blocking simultaneous reception), the parameter update information is transmitted through the second link, ensuring reliable delivery through alternative pathways.
Solution Approach 2:
The system performs preliminary checks to determine whether parameter updates can be reliably transmitted through the first link before actual transmission. If conditions indicate potential interference or reception blocking, the system proactively prepares to transmit through the second link instead, preventing update failures before they occur.
3Object-affected harmful factors
If transmission prohibition periods are implemented to avoid interference, then signal interference is reduced, but communication latency increases
Solution Approach 1:
The patent applies transmission prohibition periods selectively and locally rather than globally. Instead of prohibiting transmissions on all links during interference-prone periods, the system applies prohibitions only to specific links (first or second link) based on their individual interference conditions, allowing other links to continue transmitting and reducing overall latency.
Solution Approach 2:
The system dynamically adjusts transmission parameters including prohibition period durations, modulation schemes, and coding rates based on real-time interference measurements. When interference levels are low, prohibition periods are shortened or eliminated; when interference is high, parameters are adjusted to maintain reliability while minimizing time loss.
Data Source
AI summary
A method for operating an access point (AP) multi-link device (MLD) in a wireless local area network, the method including: transmitting a first beacon frame including at least one parameter, that is updated, used for a communication operation in a first link on the first link of multi-link; transmitting, to a non-AP MLD, a second beacon frame including at least one of first information indicating that the at least one parameter is updated or second information including a count value for the at least one parameter on a second link of the multi-link; and transmitting, to the non-AP MLD, a probe response frame including the at least one parameter.