EHT Capability Signaling for Spatial Stream Aliasing in WLAN
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Solution Overview
Problem
In wireless LAN systems, particularly in next-generation standards like IEEE 802.11be, the challenge is to effectively transmit capability information of receiving STAs, especially regarding the maximum number of spatial streams for each Modulation and Coding Scheme (MCS), while considering the worst-case performance due to aliasing issues that arise when the transmission bandwidth exceeds the operating channel width.
Innovation Solution
The proposed method involves configuring the maximum number of spatial streams that can be transmitted or received for each MCS by considering the worst-case scenario of performance deterioration due to aliasing. This is achieved by signaling the capability information, specifically including the maximum number of spatial streams for each configured MCS in the Capability information, within the Supported EHT-MCS And NSS Set field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transmission bandwidth is increased to improve throughput, then the data rate is improved, but aliasing performance deterioration occurs when the transmission bandwidth exceeds the operating channel width
Solution Approach 1:
The patent configures the maximum number of spatial streams for each MCS by considering the worst-case scenario where transmission bandwidth exceeds operating channel width. This parameter configuration approach ensures that the system can handle aliasing effects while maintaining optimal throughput performance across different bandwidth conditions.
2Measurement precision
If detailed capability information is signaled for each bandwidth configuration, then the precision of capability representation is improved, but the signaling overhead is increased
Solution Approach 1:
The patent uses a unified capability information structure that can represent the maximum number of spatial streams for multiple bandwidth configurations simultaneously. The Supported EHT-MCS And NSS Set field is designed to provide precise capability representation across different operating conditions without requiring separate signaling for each bandwidth, thus reducing overall overhead while maintaining precision.
3Reliability
If the maximum number of spatial streams is configured for each MCS considering worst-case aliasing, then the reliability in poor performance environments is improved, but the device complexity increases
Solution Approach 1:
The patent performs preliminary configuration of the maximum number of spatial streams for each MCS by considering the worst-case aliasing scenario in advance. This pre-configured capability information is then used directly during operation, eliminating the need for complex real-time calculations and reducing device complexity while ensuring reliable performance in poor communication environments.
Data Source
AI summary
The present disclosure proposes a method and apparatus for transmitting capability information of a receiving STA in a wireless LAN system. Specifically, a receiving STA generates capability information of the receiving STA and transmits same to a transmitting STA. The capability information of the receiving STA includes an EHT Capabilities element. The EHT Capabilities element includes a Supported EHT-MCS And NSS Set field. The Supported EHT-MCS And NSS Set field includes first to fourth sub-fields. The first subfield includes information related to the maximum number of spatial streams that the receiving STA can transmit/receive in each MCS, if the receiving STA is a non-AP STA operating only at 20 MHz, and a transmission bandwidth is 20 MHz, 40 MHz, 80 MHz, 160 MHz or 320 MHz.