公开(公告)号：US20240334370A1

公开(公告)日：2024-10-03

申请号：US18194196

申请日：2023-03-31

Applicant: Cisco Technology, Inc.

Inventor： Sivadeep Reddy KALAVAKURU ,  Laurent Alexandre PIERRUGUES ,  Jerome HENRY ,  Behrouz SHAYESTEH ,  Ardalan ALIZADEH

IPC: H04W64/00 ,  G01S13/76 ,  H04W56/00

CPC classification number: H04W64/00 ,  G01S13/765 ,  H04W56/006

Abstract: Fine Time Measurement (FTM) improvement for AP self-positioning may be provided. First, an Access Point (AP) graph may be generated. An AP pair may be determined for FTM AP self-positioning based on the AP graph, A plurality of Transmit (TX) signals may be sent to a paired AP of the AP pair using two more TX antennas, wherein the plurality of TX signals include FTM action frames and have a first constant Cyclic Shift Delay (CSD). A plurality of Receive (RX) signals may be received from the paired AP using two or more RX antennas, wherein the plurality of RX signals include FTM action frames and have a second constant CSD, Outlier RX signals having a low Received Signal Strength Indicator (RSSI) may be removed from the plurality of RX signals. An AP position may be determined based on the plurality of RX signals.

公开(公告)号：US20240322878A1

公开(公告)日：2024-09-26

申请号：US18190078

申请日：2023-03-25

Applicant: Cisco Technology, Inc.

Inventor： Sivadeep Reddy KALAVAKURU ,  Jerome HENRY ,  Laurent Alexandre PIERRUGUES ,  Ardalan ALIZADEH ,  Behrouz SHAYESTEH

IPC: H04B7/06 ,  H04B17/318

CPC classification number: H04B7/0626 ,  H04B17/318

Abstract: Fine Time Measurement (FTM) improvement and, specifically, trigger based FTM improvements via efficiently grouping initiators may be provided. A plurality of probe requests transmitted by a plurality of initiators is received. For each probe request, a Received Signal Strength Indication (RSSI) and Channel State Information (CSI) is determined, and a distance between an initiator and an associated responder associated with the probe request is determined based on the RSSI and the CSI. Line of Sight (LOS) or Non Line of Sight (NLOS) relationships between the plurality of initiators and one or more responders is determined based on the CSI. One or more groups of initiators is determined from the plurality of initiators based on the LOS or NLOS relationships and the distances determined for each probe request, wherein the responders and the initiators perform FTM based on the one or more groups of initiators.