Multi-Link Device Primary Link Switching for Load Balancing
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Solution Overview
Problem
In the EHT standard, the multi-link communication system faces challenges in load balancing between primary and secondary links, leading to uneven data traffic distribution and potential power consumption issues.
Innovation Solution
A multi-link device (MLD) is designed to transmit a request frame to an access point (AP) to change the primary link, allowing the MLD to determine whether to switch the primary link based on the received response frame, thereby optimizing load distribution and power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-link communication is used to support high throughput, then data rate is improved, but load balancing between links deteriorates
Solution Approach 1:
The patent implements dynamic primary link selection where the MLD can switch between different links as primary link based on current traffic conditions and power consumption requirements. The system transitions from a static primary link assignment to a dynamic selection mechanism that adapts to changing network conditions, allowing optimal load distribution across multiple links while maintaining high throughput.
Solution Approach 2:
The patent changes the operational parameters of the communication system by introducing link-specific traffic indication maps (TIDs) and allowing different channels to have different primary link designations. This parameter change enables flexible load balancing where each link can be optimized for specific traffic types or power consumption levels, resolving the contradiction between high data rate and load balancing.
2Device complexity
If primary link handles all management frames, then link management is simplified, but primary link load increases
Solution Approach 1:
The patent segments the management frame handling by link, allowing different links to serve as primary links for different TIDs. Instead of consolidating all management frames on a single primary link, the system divides the management responsibilities across multiple links based on traffic type and power consumption characteristics, reducing the load on any single link while maintaining manageable complexity through structured TID-based allocation.
3Productivity
If wide bandwidth is used for high throughput, then data rate is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic bandwidth and link selection where the MLD can switch between wide bandwidth (high throughput) and narrow bandwidth (low power consumption) modes based on current traffic requirements. By allowing flexible primary link changes and supporting different TID-to-channel mappings, the system can dynamically adjust power consumption while maintaining high throughput when needed, resolving the contradiction between throughput and power usage.
Data Source
AI summary
According to various embodiments, a multi-link device (MLD) may transmit, to an AP, a request frame for changing a primary link. On the basis of the request frame, the MLD may receive a response frame from the AP. On the basis of the response frame, the MLD may determine whether to change the primary link.