EHT STA Spatial Reuse With EMLMR Link Enablement
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Solution Overview
Problem
The current IEEE 802.11be standard lacks efficient mechanisms for enabling or disabling Enhanced Multi-Link Multi-Radio (EMLMR) mode and setting Extremely High Throughput (EHT) Operation Information Present subfield values, particularly in scenarios involving disabled subchannels, and does not support features like greater bandwidth, multiple resource unit allocation, and enhanced Modulation Coding Scheme.
Innovation Solution
Methods and apparatuses are described to define the enabling/disabling of EMLMR mode in a set of EMLMR links and enhance EHT station (STA) operations for spatial reuse, including the use of trigger frames with specific SR subfields and EHT-SIG symbol padding to facilitate efficient EHT TB PPDU transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the current trigger frame design is used, then backward compatibility is maintained, but it is not efficient to support new features in IEEE 802.11be such as greater bandwidth, multiple resource unit allocation, enhanced MCS and greater number of spatial streams
Solution Approach 1:
The trigger frame is divided into multiple independent fields including Common Info field, User Info field, and EHT-SIG fields. Each field serves specific functions and can be independently configured. The Common Info field contains parameters applicable to all users, while User Info fields provide user-specific information, allowing flexible support for new features without redesigning the entire frame structure.
Solution Approach 2:
The patent introduces a new dimension by adding EHT-SIG fields and multiple SR subfields to the existing trigger frame structure. This allows the frame to carry additional information for enhanced features (greater bandwidth, multiple RU allocation, enhanced MCS) without disrupting the original frame format, effectively adding capabilities in a new dimensional space.
2Adaptability or versatility
If the existing trigger frame includes spatial reuse features, then spatial reuse capability is provided, but unnecessary bit resources are consumed
Solution Approach 1:
The patent implements spatial reuse by assigning different SR (Spatial Reuse) values to different resource units (RUs) through dedicated SR subfields. Each RU can have its own SR configuration, allowing spatial reuse to be applied locally only where needed rather than globally across the entire channel, thus consuming bit resources efficiently.
Solution Approach 2:
The trigger frame includes SR subfields that provide spatial reuse information only for specific RUs where spatial reuse is applicable, rather than providing comprehensive spatial reuse information for all possible scenarios. This partial action approach consumes fewer bit resources while still achieving the necessary spatial reuse capability.
3Ease of operation
If EMLMR mode needs to be enabled or disabled in a set of links, then link management flexibility is achieved, but the mechanism for enabling/disabling and setting EHT Operation Information Present subfield values is not defined
Solution Approach 1:
The patent defines EMLMR mode enabling/disabling procedures and EHT Element transmission on enabled links in advance through standardized protocols. The EHT Operation Information Present subfield is pre-configured to indicate whether EHT operation information is present, allowing devices to prepare and switch modes efficiently without ad-hoc complexity during operation.
4Productivity
If greater bandwidth and enhanced MCS are implemented, then throughput is improved, but resource allocation complexity increases
Solution Approach 1:
The patent implements dynamic resource unit (RU) allocation where the size, position, and configuration of RUs can be dynamically adjusted based on channel conditions, user requirements, and traffic patterns. This dynamic allocation allows the system to efficiently utilize greater bandwidth and enhanced MCS to improve throughput while managing resource allocation complexity through adaptive rather than static configurations.
Data Source
AI summary
Methods and apparatuses are described herein how Enhanced Multi-Link Multi-Radio (EMLMR) mode is enabled or disabled in a set of EMLMR links. In one example a beacon frame is received by a station (STA) from an access point (AP) that includes an extremely high throughput (EHT) Operation element including a Disabled Channel Bitmap Present subfield and an EHT Operation Information Present subfield. When the Disabled Channel Bitmap Present subfield is equal to 1, the EHT Operation Information Present subfield is also equal to 1, the STA receives a Disabled Channel Bitmap field indicated in an EHT Operation Information field to determine the allowed subchannels for enhanced multi-link multi-ratio (EMLMR) link(s). EMLMR mode may be enabled/disabled by way of an EML Operating Mode Notification frames and bit values in an EMLMR Bitmap subfield. Additional embodiments are disclosed.