Multi-Link Multi-Radio Operation for Medium Synchronization
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Solution Overview
Problem
Existing wireless communication technologies face challenges in managing multi-link multi-radio operations due to self-interference and inefficiencies in channel access and frame exchange, particularly in non-access point multi-link devices (non-AP MLDs), leading to limitations in spectral efficiency and medium synchronization.
Innovation Solution
The implementation of enhanced multi-link multi-radio (EMLMR) mode, where non-AP MLDs dynamically manage radio operations across multiple links, allowing for enhanced modulation and coding schemes (MCS) and spatial streams (NSS) by defining operating behaviors and channel access strategies for secondary links during frame exchanges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a non-AP MLD transmits on one link, then transmission capability is improved, but self-interference causes the STA on other links to lose medium synchronization
Solution Approach 1:
The patent segments the multi-link device into multiple STAs operating on different links, with each STA independently managing its channel access and NAV timer. This segmentation allows the transmitting STA to operate at high productivity while other STAs maintain independent medium synchronization through separate NAV timers, resolving the contradiction between transmission capability and synchronization reliability.
Solution Approach 2:
The patent implements preliminary action by having STAs on other links update their NAV timers in advance based on expected transmission durations from the transmitting STA. This preliminary update ensures that when the transmission occurs, the receiving STAs are already prepared with correct NAV values, maintaining medium synchronization without being disrupted by the transmission.
2Productivity
If radios are moved across from other links to improve MCS and NSS on one link, then spectral efficiency is improved, but channel access and frame exchange on other links are impaired
Solution Approach 1:
The patent implements dynamic radio allocation where STAs can dynamically move between links based on current communication needs. When high spectral efficiency is required on one link, radios are dynamically allocated there; when channel access is needed on other links, radios are dynamically reallocated. This dynamic flexibility resolves the contradiction by allowing the system to adapt to different operational requirements.
Solution Approach 2:
The patent changes the operational parameters of STAs by allowing them to switch between different links and operational modes. STAs can change their active link, transmission power, and radio frequency parameters dynamically, enabling the system to optimize spectral efficiency on one link while maintaining channel access capability on other links through parameter adjustment.
3Speed
If enhanced MCS and NSS are supported on EMLMR links, then data rate is improved, but radio resource allocation complexity increases
Solution Approach 1:
The patent makes STAs universal by designing them to operate on multiple links with multiple radio resources. Each STA is configured to handle enhanced MCS and NSS across different links, making it multi-functional rather than dedicated to a single link. This universality reduces overall system complexity by eliminating the need for separate specialized hardware for each link while maintaining high data rates.
Data Source
AI summary
Methods and apparatuses for facilitating enhanced multi-link multi-radio (EMLMR) operation of multi-link devices (MLDs). A non-access point (AP) MLD comprises EMLMR STAS, each comprising a transceiver configured to form a link with a corresponding AP of an AP MLD, and a processor. Each link is configured to support a respective basic modulation and coding scheme (MCS) and number of spatial streams (NSS), and the links are EMLMR links configured to operate in an EMLMR mode of operation in which the EMLMR links support an enhanced MCS and NSS. A first of the EMLMR STAs, in the EMLMR mode of operation, is configured to conduct a first EMLMR frame exchange with a first of the APs over a first of the links. The processor is operably coupled to the EMLMR STAs, and configured to control a behavior of other EMLMR STAs on other EMLMR links during the first EMLMR frame exchange.