Constrained Multi-Link Reception of Group-Addressed Wi‑Fi Frames
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Non-AP multi-link devices (MLDs) face challenges in decoding group-addressed frames due to constraints on simultaneous transmission and reception across multiple links, leading to issues like self-interference, outdated network allocation vectors, and loss of medium synchronization.
Innovation Solution
Methods and apparatuses are provided to facilitate the reception of group-addressed frames by MLDs operating under constraints, including determining the reception of group-addressed frames on constrained links and managing frame exchanges to avoid overlaps, ensuring successful decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a non-AP MLD operates in EMLSR mode with a single radio across multiple links, then power consumption and hardware complexity are reduced, but the device cannot simultaneously receive group-addressed frames on all links due to constraints on simultaneous transmission and reception
Solution Approach 1:
The patent applies preliminary action by having the non-AP MLD switch to constrained mode operation in advance of receiving group-addressed frames. The device proactively transitions from EMLSR mode to constrained mode, ensuring it is in the correct operational state before attempting to receive group-addressed frames on multiple links, thereby avoiding reception failures while maintaining power efficiency.
Solution Approach 2:
The patent implements dynamics by enabling the non-AP MLD to dynamically switch between EMLSR mode and constrained mode based on operational requirements. The device can transition between these modes to adapt to different traffic patterns and reception needs, allowing it to maintain low power consumption during normal operation while reliably receiving group-addressed frames when needed.
2Productivity
If transmission occurs on one link by a non-AP MLD, then data communication is enabled, but self-interference causes the STA on another link to become incapable of sensing channel occupancy and its NAV timer becomes outdated, causing loss of medium synchronization
Solution Approach 1:
The patent applies preliminary anti-action by having the non-AP MLD switch to constrained mode operation before receiving group-addressed frames on multiple links. This preliminary mode transition prevents the self-interference problem from occurring in the first place, as constrained mode is specifically designed to handle the constraints of simultaneous transmission and reception across NSTR link pairs, maintaining NAV timer accuracy and medium synchronization.
3Measurement precision
If the non-AP MLD listens for group-addressed frames on one constrained link, then successful decoding is achieved, but the device must switch from EMLSR mode which limits simultaneous reception on multiple links
Solution Approach 1:
The patent applies preliminary action by having the non-AP MLD switch to constrained mode operation in advance of receiving group-addressed frames. This proactive mode transition ensures the device is properly configured before attempting to decode group-addressed frames, eliminating decoding failures that would occur in EMLSR mode while avoiding the need for complex real-time mode switching during frame reception.
Data Source
AI summary
Methods and apparatuses for facilitating the reception of group-addressed frames by multi-link devices (MLDs). A non-access point (AP) MLD comprises STAs, each comprising a transceiver configured to form a link with a corresponding AP of an AP MLD, and a processor. Each link has an associated predetermined time at which a group-addressed frame is expected to be received on the link, and a subset of the links are constrained links configured to operate in a constrained mode of operation. The processor is configured to, while the constrained links are operating in an active listening state in the constrained mode, determine to listen for the group-addressed frame on a first of the constrained links at the associated predetermined time, and after reception of the group-addressed frame on the first constrained link, return to listening on all of the constrained links in the constrained mode.