公开(公告)号：US20190137621A1

公开(公告)日：2019-05-09

申请号：US16147100

申请日：2018-09-28

Applicant: Apple Inc.

Inventor： Wuzhou Zhang ,  Benjamin A. Detwiler ,  David Benjamin Millman ,  Jasvinder Singh ,  Anders M. Holtsberg ,  Darin Tay

IPC: G01S13/89 ,  G01S5/02 ,  G01S11/06

CPC classification number: G01S13/89 ,  G01S5/0252 ,  G01S11/06 ,  H04B17/318

Abstract: Embodiments are disclosed for compressing radio maps of fingerprint-based positioning systems using different compression models. In an embodiment, a method comprises: receiving, by a computing device, access point (AP) data from a plurality of mobile devices operating in a geographic region, the AP data including signal strength measurements of AP signals received at a plurality of reference locations in the geographic region and uncertainty measurements associated with the signal strength measurements; determining a level of accuracy with the first compression model; responsive to the determining, selecting one of the first compression model or a second compression model to compress the AP data, the second compression model being different than the first compression model; compressing the AP data using the selected compression model; and responsive to a request from a mobile device operating in the geographic region, sending a data packet including the compressed AP data to the mobile device.

公开(公告)号：US10545231B2

公开(公告)日：2020-01-28

申请号：US16147100

申请日：2018-09-28

Applicant: Apple Inc.

Inventor： Wuzhou Zhang ,  Benjamin A. Detwiler ,  David Benjamin Millman ,  Jasvinder Singh ,  Anders M. Holtsberg ,  Darin Tay

IPC: H04W24/00 ,  G01S13/89 ,  G01S11/06 ,  G01S5/02 ,  H04B17/318

Abstract: Embodiments are disclosed for compressing radio maps of fingerprint-based positioning systems using different compression models. In an embodiment, a method comprises: receiving, by a computing device, access point (AP) data from a plurality of mobile devices operating in a geographic region, the AP data including signal strength measurements of AP signals received at a plurality of reference locations in the geographic region and uncertainty measurements associated with the signal strength measurements; determining a level of accuracy with the first compression model; responsive to the determining, selecting one of the first compression model or a second compression model to compress the AP data, the second compression model being different than the first compression model; compressing the AP data using the selected compression model; and responsive to a request from a mobile device operating in the geographic region, sending a data packet including the compressed AP data to the mobile device.