Distributed RU Signaling for PSD-Limited Wireless Channels
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Solution Overview
Problem
Existing wireless communication technologies face limitations due to power spectral density (PSD) constraints, particularly in the 6 GHz band, which reduce communication range and packet detection, necessitating the use of distributed resource units (dRUs) to overcome these issues.
Innovation Solution
A method and device for allocating and transmitting distributed resource units (dRUs) through a trigger frame that maps noncontiguous tones within a spreading bandwidth, allowing for efficient resource allocation while adhering to PSD limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional contiguous RUs are used for transmission, then the structure is simple and easy to manage, but the communication range is reduced and packet detection is impacted due to PSD limits
Solution Approach 1:
The patent segments the traditional contiguous RU into multiple noncontiguous tone groups that are distributed across the frequency spectrum. Each STA is allocated specific noncontiguous tones within the dRU, allowing the transmission to meet PSD limits while maintaining adequate signal strength for packet detection through distributed frequency diversity.
Solution Approach 2:
The patent transitions from one-dimensional contiguous frequency allocation to two-dimensional distributed frequency allocation across the channel bandwidth. By spreading tones noncontiguously across multiple frequency regions, the system achieves both PSD compliance and improved packet detection through frequency diversity without requiring additional spatial dimensions.
2Reliability
If distributed RUs with noncontiguous tones are used, then communication range and packet detection are improved, but the device complexity increases due to tone mapping requirements
Solution Approach 1:
The patent changes the fundamental parameter of frequency allocation from contiguous to noncontiguous distribution. By defining dRUs with specific noncontiguous tone patterns and spreading bandwidths, the system achieves extended communication range while managing complexity through standardized parameter sets for tone mapping that can be pre-configured and efficiently processed.
3Device complexity
If dRUs are allocated without tone mapping information, then the frame format is simpler, but the STAs cannot properly map tones and transmit efficiently
Solution Approach 1:
The patent performs preliminary action by pre-defining tone mapping relationships and spreading bandwidth configurations in the trigger frame before actual data transmission. The AP allocates dRUs with embedded tone mapping information that enables STAs to pre-configure their modems for efficient distributed transmission, avoiding complex real-time calculations during the actual data transfer phase.
Data Source
AI summary
This disclosure provides methods, devices and systems for increasing the transmit power of wireless communication devices operating on power spectral density (PSD)-limited wireless channels. Some implementations more specifically relate to signaling in a trigger frame to support distributed transmissions via distributed resource units (dRUs). In some implementations, an access point (AP) may transmit a trigger frame soliciting a trigger-based (TB) physical layer convergence protocol (PLCP) protocol data unit (PPDU) from a wireless station (STA), where the trigger frame carries RU allocation information identifying a distributed resource unit (dRU) allocated for the STA and carries tone mapping information indicating a selected spreading bandwidth design for the wireless channel or subchannel. The AP can support channel puncturing by selecting a particular spreading bandwidth design that controls how dRUs are mapped to non-contiguous tones spanning respective spreading bandwidths.