公开(公告)号：US10656256B2

公开(公告)日：2020-05-19

申请号：US15947306

申请日：2018-04-06

Applicant: Marvell World Trade Ltd.

Inventor： Liwen Chu ,  Sagar Tamhane ,  Hongyuan Zhang ,  Christian Berger ,  Niranjan Grandhe ,  Sudhir Srinivasa ,  Hui-Ling Lou

IPC: H04W72/12 ,  G01S11/02 ,  H04W68/00 ,  G01S5/00 ,  H04W64/00 ,  G01S5/02 ,  G01S13/76 ,  G01S5/14

Abstract: During a service period (SP) for a ranging measurement signal exchange between a first communication device and one or more second communication devices, the first communication device receives respective first null data packets (NDPs) from the one or more second communication devices, and transmits respective second NDPs to the one or more second communication devices. The first communication device transmits, during the SP, respective first ranging measurement feedback packets to the one or more second communication devices to allow each of the one or more second communication devices to determine a time-of-flight between the first communication device and the second communication device and/or receives, during the SP, respective second ranging measurement feedback packets from the one or more second communication devices to allow the first communication device to determine respective times-of-flight between the first communication device and the one or more second communication devices.

公开(公告)号：US10440598B2

公开(公告)日：2019-10-08

申请号：US15469274

申请日：2017-03-24

Applicant: Marvell World Trade Ltd.

Inventor： Liwen Chu ,  Sagar Tamhane ,  Hongyuan Zhang ,  Hui-Ling Lou

IPC: H04W24/10 ,  H04B17/24 ,  H04W24/08 ,  H04W56/00 ,  G01S5/00 ,  H04W64/00

Abstract: A first communication device generates a range measurement packet (or a packet that includes a probe response frame, a TIM frame, etc.) associated with a range measurement signal exchange session between the first communication device and a second communication device. The first communication device records a time value of a first timer corresponding to a time of transmission of the packet, and includes timing information corresponding to the recorded time value in the packet. The first communication device transmits the packet to the second communication device. The timing information in the packet is useable by a third communication device to adjust time values corresponding to a second timer, which the third communication device includes.