Trigger-Based Uplink Association for Wi-Fi Range
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Solution Overview
Problem
Low-end mobile computing devices with limited communication range struggle to associate and exchange data frames with access points in Wi-Fi networks due to asymmetric uplink/downlink budget and lack of association identifiers, leading to failed acknowledgement transmissions.
Innovation Solution
Implementing a trigger-based uplink single user (UL-SU) transmission mechanism in access points, where an association identifier is obtained and a unicast trigger frame is included in the acknowledgement to facilitate extended communication range and correct resource unit identification for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low-end station devices transmit uplink packets with limited power, then energy consumption is reduced and device simplicity is maintained, but the uplink communication range is insufficient and acknowledgements cannot reach the access point
Solution Approach 1:
The patent implements asymmetric uplink/downlink transmission where the downlink uses high-power access point transmissions to reach low-end stations, while the uplink uses low-power station transmissions. The access point aggregates multiple low-power uplink transmissions from different stations in OFDMA fashion, compensating for individual station power limitations through system-level coordination and resource allocation.
2Productivity
If random access uplink OFDMA is used for association requests, then multiple stations can access simultaneously, but stations lack association identifiers needed to receive targeted acknowledgements
Solution Approach 1:
The access point performs preliminary actions by allocating resource units and preparing acknowledgment frames before receiving uplink transmissions from stations. The access point maintains a mapping between resource unit indices and station identifiers, enabling it to send targeted acknowledgments to specific stations even before formal association is complete. This preliminary resource allocation and identifier assignment resolves the chicken-and-egg problem of needing identifiers to receive acknowledgments while simultaneously performing random access.
3Productivity
If uplink OFDMA random access is implemented, then resource utilization improves, but low-power station acknowledgements cannot reach the access point due to asymmetric budget
Solution Approach 1:
The access point acts as an intermediary that receives and aggregates uplink transmissions from low-power stations using OFDMA resource units. The access point then retransmits acknowledgment information with higher power to ensure reliable delivery to the intended stations. This intermediary role allows the system to maintain both high resource utilization through OFDMA and reliable acknowledgment delivery despite asymmetric power budgets.
Data Source
AI summary
In aspects of access point association using trigger-based uplink single user transmission, a wireless network system includes a station device that detects an initial trigger frame communicated in the wireless network system, and the station device can communicate an association request to an access point to join the wireless network system. The access point can receive the association request from the station device and generate an association response as an acknowledgement to the association request. The acknowledgement aggregates an association response frame that includes an association identifier for the station device and a unicast trigger frame to initiate a trigger-based uplink single user (UL-SU) transmission from the station device. The access point can then communicate the acknowledgement to the station device.