EMLMR Multi-Link Radio Control for Medium Synchronization
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Solution Overview
Problem
Existing wireless local area network (WLAN) technologies face limitations in multi-link multi-radio (MLMR) operations due to self-interference and inefficient use of enhanced modulation and coding schemes (MCS) and number of spatial streams (NSS) across multiple links, leading to potential loss of medium synchronization and suboptimal spectral efficiency.
Innovation Solution
The implementation of enhanced multi-link multi-radio (EMLMR) mode, where a non-AP MLD dynamically controls the behavior of its STAs across multiple links, allowing for dynamic switching between basic and enhanced MCS/NSS based on need, and defining operating behaviors for secondary links during frame exchanges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission is conducted on one link by a non-AP MLD, then the supported MCS and NSS can be improved on that link, but self-interference occurs at the STA operating on the other link causing loss of medium synchronization
Solution Approach 1:
The patent segments the multi-link device into multiple independent STAs, each capable of autonomous operation on separate links. This segmentation allows the device to manage transmissions and receptions independently on each link, reducing self-interference between links while maintaining medium synchronization through individual NAV timers for each STA.
Solution Approach 2:
The patent implements dynamic behavior control where the non-AP MLD can dynamically adjust the operational state of its STAs based on ongoing frame exchanges. When a frame exchange is detected on one link, the MLD dynamically controls other STAs to enter sleep mode or adjust their channel access behavior, thereby preventing self-interference while maintaining synchronization.
2Productivity
If radios are moved across from other links to the first link to improve MCS and NSS, then spectral efficiency increases on the first link, but channel access and medium synchronization may be lost on other links
Solution Approach 1:
The patent applies local quality by allowing different STAs to have different operational characteristics based on their link's needs. Each STA can independently adjust its radio resource allocation, MCS, and NSS based on local channel conditions and frame exchange requirements, rather than uniformly affecting all links.
Solution Approach 2:
The patent implements preliminary action by having the non-AP MLD proactively control the behavior of STAs before potential interference occurs. When a frame exchange is initiated on one link, the MLD preemptively adjusts other STAs' operations to prevent self-interference, ensuring medium synchronization is maintained before problems arise.
3Productivity
If enhanced MCS and NSS are used on primary links, then transmission performance improves, but maintaining medium synchronization on secondary links becomes more difficult
Solution Approach 1:
The patent implements feedback mechanisms where each STA monitors its own link's frame exchanges and channel occupancy. This feedback allows the non-AP MLD to adjust the behavior of other STAs in real-time, ensuring that enhanced transmission performance on one link does not compromise medium synchronization on other links.
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.