Compressed Mode PPDU for Multi-User MIMO Signaling
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Solution Overview
Problem
Current wireless communication standards, such as 802.11ax, are limited in their ability to efficiently transmit to multiple user multiple-input multiple-output (MU-MIMO) groups over large bandwidths, resulting in high signaling overhead and restricted usage of compressed mode for only single groups or limited bandwidths.
Innovation Solution
The introduction of a wireless transmitting device and method that enables transmission to multiple MU-MIMO groups in compressed mode by incorporating spatial configuration fields in the PPDU, allowing for reduced signaling overhead and expanded bandwidth usage through a simple OFDMA scheme, enabling up to 16 users to be served in a single PPDU.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If compressed mode is used for single MU-MIMO group transmission, then signaling overhead is reduced, but the capability to serve multiple MU-MIMO groups is lost
Solution Approach 1:
The patent divides the spatial configuration information into multiple separate SC fields, with each SC field corresponding to a specific MU-MIMO group. This segmentation allows the system to maintain the compact compressed mode structure while supporting multiple groups, as each group's configuration is independently defined in its own SC field rather than requiring a complete resource allocation table.
Solution Approach 2:
The patent introduces a group identifier dimension to the compressed mode structure. By adding a group ID field and multiple SC fields indexed by group ID, the system transitions from a single-group compressed mode to a multi-group compressed mode without abandoning the compression paradigm. This dimensional extension allows multiple groups to be served while maintaining the overhead-reduced structure.
2Adaptability or versatility
If non-compressed mode is used for multiple MU-MIMO groups, then multiple groups can be served, but signaling overhead increases
Solution Approach 1:
The patent extracts the resource allocation subfields from the common part of HE-SIG-B and removes them entirely in compressed mode. Instead, the system uses a simplified structure with only group ID and SC fields, taking out the redundant resource allocation information that is implicitly defined by the compressed mode parameters. This extraction dramatically reduces signaling overhead while maintaining multi-group support.
3Duration of action of moving object
If compressed mode is used for entire BW transmission, then HE-SIG-B duration is reduced, but bandwidth flexibility is limited
Solution Approach 1:
The patent creates a universal compressed mode structure that can serve multiple MU-MIMO groups across different bandwidth configurations. The SC fields and group ID mechanism are designed to work across 20 MHz, 40 MHz, 80 MHz, 160 MHz, and 320 MHz bandwidths, making the compressed mode universally applicable rather than limited to single-group or specific bandwidth scenarios.
Data Source
AI summary
A wireless transmitting device is configured to: obtain a compressed-mode PPDU that includes one or more SC fields, where each SC field corresponds to one MU-MIMO group of the one or more MU-MIMO groups and is indicative of a spatial stream configuration for user devices of that MU-MIMO group; and transmit the PPDU to the user devices of the one or more MU-MIMO groups over a predetermined BW. Further, a user device is configured to: receive a compressed-mode PPDU from a wireless transmitting device; and decode the PPDU to obtain a SC field corresponding to the MU-MIMO group that the user device belongs to.