Multi-Bandwidth Ranging Polls for HE and EHT WLAN Stations
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Solution Overview
Problem
Existing wireless local area networks (WLANs) face inefficiencies and reduced accuracy in ranging procedures due to the use of inconsistent bandwidths between high efficiency (HE) and extremely high throughput (EHT) stations, leading to wasted transmission opportunities and exclusion of HE STAs from larger bandwidth ranging processes.
Innovation Solution
Implementing a method where a responding station (R-STA) transmits a first ranging poll with frequency domain repetitions based on different bandwidths, allowing for efficient communication with both HE and EHT STAs by indicating a second ranging poll over a smaller bandwidth, and enabling multi-link communication with enhanced multi-link single radio (EMLSR) or enhanced multi-link multi radio (EMLMR) STAs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the AP uses a ranging procedure with larger bandwidth to improve accuracy for EHT STAs, then ranging accuracy is improved, but HE STAs are excluded from participation
Solution Approach 1:
The ranging procedure is segmented into multiple bandwidth configurations within a single transmission opportunity. The AP transmits ranging polls at different bandwidths (e.g., 80 MHz and 160 MHz) to accommodate both HE STAs and EHT STAs simultaneously, allowing each STA type to participate in the ranging procedure at its supported bandwidth without exclusion
Solution Approach 2:
The AP dynamically adjusts the bandwidth of ranging polls based on the target STA type. The system transitions from static bandwidth selection to dynamic bandwidth adaptation, where the AP can switch between different bandwidth configurations within the same ranging window to serve diverse STA capabilities, improving both accuracy and inclusivity
2Adaptability or versatility
If the AP uses a ranging procedure with smaller bandwidth to maintain HE STA compatibility, then STA compatibility is maintained, but ranging accuracy and efficiency are reduced
Solution Approach 1:
The ranging procedure is divided into multiple bandwidth segments, allowing HE STAs to participate at smaller bandwidths (e.g., 80 MHz) while EHT STAs can utilize larger bandwidths (e.g., 160 MHz). This segmentation enables each STA type to achieve optimal ranging accuracy at its supported bandwidth while maintaining overall system compatibility
Solution Approach 2:
The ranging procedure becomes universal by supporting multiple bandwidth configurations within a single transmission opportunity. The AP designs the ranging poll structure to be multi-functional, serving both HE and EHT STAs simultaneously with different bandwidth options, thereby achieving both compatibility and high accuracy without requiring separate procedures
3Adaptability or versatility
If the AP transmits ranging polls repeatedly in frequency domain to serve both bandwidth types, then both HE and EHT STAs can participate, but transmission complexity increases
Solution Approach 1:
The AP employs periodic transmission of ranging polls at different bandwidths within a structured ranging window. Instead of random or ad-hoc repetitions, the system uses periodic patterns where ranging polls are transmitted at regular intervals at different bandwidth configurations, making the complexity manageable through predictable timing and structure
Solution Approach 2:
The AP performs preliminary configuration and announcement of the multi-bandwidth ranging procedure before actual ranging transmissions. By pre-defining the bandwidth configurations, timing structures, and STA participation rules in advance, the system reduces real-time transmission complexity while maintaining support for multiple bandwidth types
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a responding station may transmit a first ranging poll via a first bandwidth, the first ranging poll comprising an indication of a second ranging poll and first polling information transmitted with repetitions in a frequency domain based at least in part on serving first initiating stations (I-STAs) configured for communication using the first bandwidth and second I-STAs configured for communication using a second bandwidth that is smaller than the first bandwidth. The responding station may transmit, based at least in part on the indication of the second ranging poll, the second ranging poll over the second bandwidth comprising second polling information. Numerous other aspects are described.