Spatial Reuse Uplink Multi-User Transmissions
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Solution Overview
Problem
In wireless local-area networks (WLANs), especially those using IEEE 802.11ax, there is a challenge in efficiently managing uplink multi-user transmissions due to interference from multiple devices sharing resources and the need to operate with both new and legacy protocols, which affects bandwidth and response times.
Innovation Solution
The implementation of spatial reuse techniques for uplink multi-user transmissions, where a high-efficiency access point uses orthogonal frequency division multiple-access (OFDMA) and multiple-user multiple-input multiple-output (MU-MIMO) to schedule transmissions, excluding legacy devices during a contention period and adjusting transmit power based on received signal strength and interference levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple devices share the same wireless resources in a WLAN, then network coverage and device connectivity are improved, but interference between devices increases and bandwidth utilization deteriorates
Solution Approach 1:
The patent segments the wireless medium into multiple orthogonal frequency subchannels through OFDMA, allowing simultaneous non-interfering transmissions. Each subchannel is allocated to specific devices, dividing the frequency spectrum into independent transmission paths that eliminate interference while maintaining high bandwidth utilization.
Solution Approach 2:
The patent introduces spatial dimension for resource allocation by enabling multiple devices to transmit simultaneously on different frequency subchannels. This transforms the traditional single-dimension (time) resource sharing into multi-dimensional (frequency + time + space) resource allocation, significantly improving both connectivity and bandwidth utilization.
2Ease of operation
If newer protocols and legacy device protocols operate simultaneously in the WLAN, then protocol compatibility and ease of operation are improved, but interference and resource contention increase
Solution Approach 1:
The patent introduces a trigger frame as an intermediary mechanism that coordinates transmissions between HE devices and legacy devices. The trigger frame schedules uplink multi-user transmissions, allowing HE devices to transmit on allocated subchannels while legacy devices remain silent during the scheduled period, eliminating interference while maintaining protocol compatibility.
Solution Approach 2:
The access point performs preliminary scheduling through trigger frames before actual data transmissions. This preliminary action allocates frequency subchannels and transmission timing in advance, ensuring that HE devices and legacy devices do not interfere with each other while maintaining seamless coexistence.
3Productivity
If spatial reuse techniques are used to allow simultaneous transmissions, then bandwidth utilization and productivity are improved, but interference management and device complexity increase
Solution Approach 1:
The patent implements feedback mechanisms where the access point monitors transmission quality and adjusts trigger frame scheduling accordingly. Based on feedback about channel conditions and interference levels, the access point dynamically allocates frequency subchannels and transmission parameters, managing interference automatically without increasing device complexity.
Data Source
AI summary
Methods, apparatuses, computer readable media for spatial reuse for uplink multi-user transmissions. An apparatus of a station comprising processing circuitry is disclosed. The processing circuitry may be configured to decode a first portion of a physical layer convergence procedure (PLCP) protocol data unit (PPDU), and configure the station to transmit a frame, if the PPDU is an overlapping basic service set (OBSS) PPDU, and a receive power of the PPDU is below an overlapping power detect level. An apparatus of an access point comprising processing circuitry is disclosed. The processing circuitry may be configured to encode a PPDU comprising a basic service set identifier of the access point, and encode the PPDU to indicate spatial reuse (SR) delay, SR restricted, or SR not permitted. The processing circuitry may be further configured to configure the access point to transmit the PPDU.