Multi-Link Operation with Millimeter Wave Link
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Solution Overview
Problem
Millimeter Wave (mmWave) wireless communication systems face challenges in maintaining robust and efficient communication due to frequent link breakages and interference, particularly in environments prone to blockage, and existing solutions often increase complexity by requiring separate PHY and MAC processes for each frequency band.
Innovation Solution
The implementation of a Multi-Link Operation (MLO) mechanism, specifically the Enhanced Multilink Single-Radio (EMLSR) operation mode, which allows devices to operate over both sub-10 GHz and mmWave frequency bands using a shared baseband and antenna arrays, enabling seamless switching between links to maintain communication and reduce complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate PHY and MAC processes are used for each frequency band, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines separate PHY and MAC processes for different frequency bands into a unified multi-link operation framework. Multiple frequency bands (2.4 GHz, 5 GHz, 6 GHz) are merged into a single coordinated system where links can be aggregated and managed together, reducing device complexity while maintaining communication reliability through diversity.
Solution Approach 2:
The patent implements a universal MAC layer that can operate across multiple frequency bands and link types. The multi-link operation mechanism provides multi-functional capability to handle simultaneous communications on different bands, allowing a single device architecture to serve multiple purposes without requiring separate dedicated processes for each band.
2Productivity
If mmWave frequency band is used, then data transmission rate is improved, but link stability deteriorates due to blockage and interference
Solution Approach 1:
The patent implements dynamic link management where the system can adaptively switch between mmWave and sub-6 GHz bands based on real-time channel conditions. When mmWave links experience blockage or interference, the system dynamically transitions to alternative links, maintaining both high data rates when possible and link stability when needed.
Solution Approach 2:
The patent employs feedback mechanisms through multi-link operation where channel quality information from mmWave links is continuously monitored and fed back to the MAC layer. This enables real-time detection of blockage or interference conditions, triggering automatic link switching or aggregation adjustments to maintain stability while utilizing mmWave high-speed capabilities when available.
3Reliability
If link switching mechanism is implemented, then robustness is improved, but operation complexity increases
Solution Approach 1:
The patent implements self-service link management where the multi-link operation mechanism automatically performs link selection, switching, and aggregation without requiring manual configuration or complex user intervention. The system autonomously monitors link quality, detects failures, and executes switching decisions, improving robustness while keeping operation simple for end users.
Data Source
AI summary
For example, a non Access Point (AP) (non-AP) Multi-Link Device (MLD) may operate at an Enhanced Multi-Link Single Radio (EMLSR) operation mode of a Multi-Link Operation (MLO) over a plurality of links with an AP MLD, for example, based on a determination that the non-AP MLD is to operate over a millimeter Wave (mmWave) frequency band. For example, the plurality of links may include a sub 10 Gigahertz (GHz) (sub-10 GHz) link over a sub-10 GHz frequency band and an mmWave link over the mmWave frequency band. For example, the non-AP MLD may be configured to listen over the plurality of links to identify an Initial Control Frame (ICF) from the AP MLD; and to identify, based on detection of the ICF from the AP MLD over the mmWave link, that a Transmit Opportunity (TxOP) is to be established to communicate traffic with the AP MLD over the mmWave link.