Uplink Sounding Trigger Element for WLAN Resource Allocation
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Solution Overview
Problem
Wireless local area networks (WLANs) face challenges in efficiently managing bandwidth and response times due to multiple devices sharing resources, with legacy devices often limited by their communication protocols and hardware, and the need to operate with both new and legacy protocols.
Innovation Solution
The implementation of an uplink sounding method in WLANs, where a master station transmits an uplink sounding trigger element (USTE) to HE stations, which then transmit uplink sounding referee elements (USREs) and feedback information, allowing the master station to determine channel quality and allocate resources for multi-user (MU) UL and DL transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple devices share the same wireless resources, then network coverage and device compatibility are improved, but bandwidth efficiency and response times deteriorate
Solution Approach 1:
The patent segments the wireless network into different operational modes (legacy mode and HE mode) with separate resource allocation mechanisms. Legacy devices operate under traditional CSMA/CA protocols while HE devices utilize OFDMA and uplink sounding procedures, allowing simultaneous operation without mutual interference and optimizing bandwidth efficiency for each device type
Solution Approach 2:
The patent introduces uplink sounding trigger elements (USTEs) and sounding reference signals as intermediary mechanisms that enable the access point to actively probe and measure channel quality for multiple devices. This intermediary sounding process provides detailed channel state information that facilitates optimized resource allocation and precoding for high-efficiency devices while maintaining compatibility with legacy devices
2Adaptability or versatility
If legacy devices operate with older communication protocols, then backward compatibility is maintained, but resource allocation efficiency and channel quality optimization deteriorate
Solution Approach 1:
The patent implements dynamic resource allocation where the access point can flexibly assign resources based on device type and channel conditions. HE devices receive dynamically allocated resource units through OFDMA based on uplink sounding results, while legacy devices continue using traditional contention-based access, allowing each device type to operate at its optimal efficiency level
Solution Approach 2:
The patent changes the operational parameters for different device types: HE devices utilize advanced parameters such as OFDMA resource units, uplink sounding reference signals, and precoding matrices, while legacy devices operate with traditional parameters like contention window sizes and inter-frame spaces, allowing each to achieve optimal performance within its protocol constraints
3Measurement precision
If uplink sounding is implemented for channel quality determination, then resource allocation precision is improved, but system complexity and overhead increase
Solution Approach 1:
The patent designs the uplink sounding mechanism to serve multiple functions simultaneously: it provides channel quality information for resource allocation, enables precoding optimization for MU-MIMO, supports both OFDMA and MU-MIMO operations, and works across different bandwidth configurations. This multi-functionality reduces the need for separate measurement mechanisms and justifies the added complexity through comprehensive performance improvement
Data Source
AI summary
Apparatuses, computer readable media, and methods for uplink sounding in wireless networks are disclosed. An apparatus of a wireless device may include processing circuitry configured to: encode an uplink sounding trigger element (USTE) for one or more stations, the USTE comprising one or more uplink (UL) resource allocations for the one or more stations to transmit one or more uplink sounding referee elements (USREs) to the wireless device. The processing circuitry may be further configured to configure the wireless device to transmit the USTE to the one or more stations, and decode the one or more USREs from the one or more station, wherein the one or more USREs are to be received by the wireless device in accordance with a corresponding resource allocation indicated in the USTE.