WLAN PPDU Bandwidth Allocation for Mixed-Capability Stations
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Solution Overview
Problem
Existing WLAN systems face challenges in efficiently supporting wider bandwidths due to limitations in station (STA) capabilities, leading to degraded communication performance when attempting to transmit and receive physical packet data units (PPDUs) beyond the legacy bandwidth.
Innovation Solution
STAs transmit performance information indicating supported modulation and coding schemes (MCSs) to access points (APs), allowing APs to generate PPDUs suitable for the STA's capabilities, thereby improving communication efficiency in wider bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the bandwidth of a PPDU transmitted by an access point exceeds the bandwidth supportable by a station, then frequency spectrum efficiency is improved, but transmission reliability deteriorates due to mismatch between transmitted and receivable bandwidths
Solution Approach 1:
The patent segments the wide-bandwidth PPDU into multiple sub-PPDUs, each tailored to the specific bandwidth capability of individual stations. The access point divides the frequency spectrum into multiple resource units and allocates appropriate sub-PPDUs to stations based on their supported bandwidths, ensuring reliable reception while maintaining overall spectral efficiency.
Solution Approach 2:
The patent applies local quality by customizing the bandwidth characteristics of sub-PPDUs according to the specific capabilities of each station. Each station receives a sub-PPDU with bandwidth properties matched to its reception capabilities, rather than using a uniform bandwidth approach for all stations.
2Productivity
If the access point transmits PPDU at maximum supported bandwidth, then throughput is maximized, but compatibility with legacy stations deteriorates
Solution Approach 1:
The patent enables the access point to serve multiple types of stations simultaneously - both legacy stations with narrower bandwidth support and advanced stations capable of wider bandwidths. By generating multiple sub-PPDUs with different bandwidth configurations from a single wide-bandwidth transmission, the system achieves universal compatibility across diverse station types while maintaining high throughput.
3Productivity
If the station supports wider bandwidth than defined in legacy protocol, then frequency spectrum efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic bandwidth support where the station can adapt its reception capabilities based on the transmitted signal characteristics. The station processes wide-bandwidth PPDUs by dynamically adjusting its resource unit allocation and sub-PPDU extraction operations, allowing it to support wider bandwidths without requiring permanently complex hardware configurations for all operating conditions.
Data Source
AI summary
A station (STA) that communicates with an access point (AP) in a Wireless Local Area Network (WLAN) system includes a transceiver configured to support transmission and reception of signals within at least a first bandwidth and to receive a first physical layer protocol data unit (PPDU) conforming to a second bandwidth greater than the first bandwidth, and processing circuitry configured to support a wider bandwidth than the first bandwidth by obtaining a second PPDU allocated to the STA within the first bandwidth from the first PPDU. The processing circuitry is configured to control the transceiver to transmit, to the AP, performance information indicating first modulation and coding schemes (MCSs) supportable in the wider bandwidth according to a capability of the STA, among a plurality of candidate MCSs.