User Info Field Signaling for Unequal Modulation and Extended MCS
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Solution Overview
Problem
Existing wireless communication systems lack an efficient mechanism to indicate modulation and coding schemes (MCS) beyond the 16 supported MCSs, particularly in ultra-high reliability (UHR) networks, leading to ambiguity and limitations in supporting additional MCSs and unequal modulation techniques.
Innovation Solution
Implementing a user info field with at least five bits to indicate MCSs, allowing for separate indication of code rate and modulation scheme, or using a single subfield for a range and index of MCSs, and supporting patterns of modulation schemes across spatial streams, enabling flexible and accurate MCS signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a 4-bit MCS field is used to indicate MCS, then the signaling overhead is low, but only 16 MCSs can be supported causing ambiguity when additional MCSs are needed
Solution Approach 1:
The MCS indication is segmented into multiple parts: a 4-bit MCS field for base indication, and additional subfields (R/M subfield and 2-bit subfield) that provide extended indication capabilities. This segmentation allows supporting more than 16 MCSs while maintaining efficient signaling for common cases.
Solution Approach 2:
The patent extends the MCS indication from a single 4-bit dimension to multiple dimensions by introducing additional subfields (R/M subfield, 2-bit subfield) that work together to indicate MCS indices beyond 16, effectively adding spatial dimensions to the signaling structure.
2Adaptability or versatility
If separate indication of code rate and modulation scheme is implemented, then flexibility for unequal modulation is improved, but device complexity increases
Solution Approach 1:
The MCS indication structure is segmented into distinct subfields: R/M subfield for code rate/modulation type indication and a 2-bit subfield for additional modulation scheme information. This segmentation enables separate control of code rate and modulation scheme, providing flexibility for unequal modulation across spatial streams.
Solution Approach 2:
The R/M subfield serves multiple functions: indicating code rate, indicating modulation type, and working with the 2-bit subfield to provide comprehensive MCS indication. This multi-functionality reduces the need for separate dedicated fields for each parameter.
Data Source
AI summary
This disclosure provides methods, components, devices and systems for signaling designs for unequal modulation and modulation and coding scheme (MCS) indication. Some aspects more specifically relate to user info field designs to support such an unequal modulation indication and/or an MCS indication, including designs for user info fields of multi-user (MU) physical layer (PHY) protocol data units (PPDUs) and of Trigger frames. In some examples, an access point (AP) may configure a user info field to include at least five bits for MCS signaling, which may enable the AP to uniquely identify an MCS from a set of greater than 16 MCSs. Additionally, or alternatively, the AP may configure a user info field to include a subfield indicative of a pattern of modulation schemes (such as an equal modulation or an unequal modulation) across a set of spatial streams allocated for communication between the AP and a station (STA).