公开(公告)号：US20250093530A1

公开(公告)日：2025-03-20

申请号：US18467040

申请日：2023-09-14

Applicant: Cisco Technology, Inc.

Inventor： Ardalan Alizadeh ,  Navid Reyhanian ,  Audrey Yazdanparast ,  Peiman Amini ,  Jerome Henry

IPC: G01S19/48

Abstract: Described herein are devices, systems, methods, and processes for managing the computational complexity in geolocating a large number of network devices (e.g., access points (APs)) in indoor environments. A number of network devices may be partitioned into smaller groups or batches based on neighbor knowledge about the network devices. Each batch of network devices can include just devices located on a same floor, or may include devices located across different floors. Every batch may include at least one anchor network device. The geolocation of the network devices can be determined, batch-by-batch, based on fusing global navigation satellite system (GNSS) pseudorange measurements and inter-network device ranging measurements. The geolocation accuracy for each partition can be evaluated utilizing such metrics as the average residual error. If the error for a batch is greater than a threshold, remedial measures may be taken to reduce the error and improve the geolocation accuracy.

公开(公告)号：US20250085441A1

公开(公告)日：2025-03-13

申请号：US18466659

申请日：2023-09-13

Applicant: Cisco Technology, Inc.

Inventor： Peiman Amini ,  Ardalan Alizadeh ,  Jerome Henry ,  Arya Fallahi ,  Navid Reyhanian

IPC: G01S19/46

Abstract: Described herein are devices, systems, methods, and processes for estimating the geolocation of network devices by jointly utilizing pseudorange measurements from global navigation satellite system (GNSS) satellites and terrestrial-based ranging measurements between network devices. Each network device is equipped with a GNSS receiver that collects pseudorange data from each satellite link at time intervals. Terrestrial-based ranging measurements between network devices can also be collected. The receiver clock error can be accounted for at least in part by over-the-air time synchronization of network devices. To mitigate the impact of multipath and improve accuracy, pseudorange measurements with less than satisfactory quality metrics can be filtered out. In some embodiments, the geolocation of anchor network devices can be estimated with high accuracy first, and then the rest of the non-anchor network devices may be localized in a second-stage localization process.

公开(公告)号：US20240380459A1

公开(公告)日：2024-11-14

申请号：US18459564

申请日：2023-09-01

Applicant: Cisco Technology, Inc.

Inventor： Ardalan Alizadeh ,  Navid Reyhanian ,  Sivadeep R. Kalavakuru ,  Matthew A. Silverman ,  Peiman Amini

IPC: H04B7/06 ,  H04B7/0456

Abstract: Enhancing Multi-Access Point (AP) Coordination (MAPC) null-steering may be provided. Enhancing null-steering may include sending a coordination request for MAPC. A coordination response may be received from one or more APs. A Channel State Information (CSI) request may then be sent. CSI of one or more clients associated with the one or more APs may be received. Next, one or more precoder and decoder matrices may be determined based on the CSI of the one or more clients. The one or more precoder matrices may be sent to the one or more APs, and the one or more decoder matrices may be sent to the one or more clients. A transmission may be sent to a first client using null-steering and interference alignment based on the one or more precoder matrices, wherein the transmitting is synchronized with transmissions by the one or more APs to the one or more clients.