公开(公告)号：US20230028255A1

公开(公告)日：2023-01-26

申请号：US17937659

申请日：2022-10-03

Applicant: Apple Inc.

Inventor： Birju N. Shah ,  Tristan F. Schaap ,  James E. Zmuda ,  Manfred von Willich

IPC: H04L9/12 ,  G06F21/64 ,  H04J3/06 ,  H04L9/32 ,  H04L9/40 ,  H04L9/00 ,  H04L7/00

Abstract: Techniques are disclosed relating to time synchronization in a network. In some embodiments, an apparatus includes a first circuit having a first clock configured to maintain a local time value for a node coupled to a network. The first circuit is configured to send a first message to a second circuit. The first message includes a first nonce. The second circuit has a second clock that maintains a reference time value for the network. The first circuit receives a second message from the second circuit, the second message including a second nonce and is associated with a timestamp identifying the reference time value. The first circuit compares the first nonce to the second nonce to determine whether the timestamp is valid and, in response to determining that the timestamp is valid, uses the timestamp to synchronize the first clock with the second clock.

公开(公告)号：US20190245690A1

公开(公告)日：2019-08-08

申请号：US16329743

申请日：2017-09-08

Applicant: Apple Inc.

Inventor： Birju N. Shah ,  Tristan F. Schaap ,  James E. Zmuda ,  Manfred von Willich

IPC: H04L9/12 ,  H04J3/06 ,  H04L9/32 ,  H04L29/06 ,  G06F21/64

CPC classification number: H04L9/12 ,  G06F21/64 ,  G06F2221/2151 ,  H04J3/0667 ,  H04L9/00 ,  H04L9/3234 ,  H04L9/3242 ,  H04L63/00 ,  H04L63/123 ,  H04L2209/12

Abstract: Techniques are disclosed relating to time synchronization in a network. In some embodiments, an apparatus includes a first circuit having a first clock configured to maintain a local time value for a node coupled to a network. The first circuit is configured to send a first message to a second circuit. The first message includes a first nonce. The second circuit has a second clock that maintains a reference time value for the network. The first circuit receives a second message from the second circuit, the second message including a second nonce and is associated with a timestamp identifying the reference time value. The first circuit compares the first nonce to the second nonce to determine whether the timestamp is valid and, in response to determining that the timestamp is valid, uses the timestamp to synchronize the first clock with the second clock.

公开(公告)号：US12155760B2

公开(公告)日：2024-11-26

申请号：US17937659

申请日：2022-10-03

Applicant: Apple Inc.

Inventor： Birju N. Shah ,  Tristan F. Schaap ,  James E. Zmuda ,  Manfred von Willich

IPC: H04L9/12 ,  G06F21/64 ,  H04J3/06 ,  H04L7/00 ,  H04L9/00 ,  H04L9/32 ,  H04L9/40

Abstract: Techniques are disclosed relating to time synchronization in a network. In some embodiments, an apparatus includes a first circuit having a first clock configured to maintain a local time value for a node coupled to a network. The first circuit is configured to send a first message to a second circuit. The first message includes a first nonce. The second circuit has a second clock that maintains a reference time value for the network. The first circuit receives a second message from the second circuit, the second message including a second nonce and is associated with a timestamp identifying the reference time value. The first circuit compares the first nonce to the second nonce to determine whether the timestamp is valid and, in response to determining that the timestamp is valid, uses the timestamp to synchronize the first clock with the second clock.

公开(公告)号：US11463253B2

公开(公告)日：2022-10-04

申请号：US16329743

申请日：2017-09-08

Applicant: Apple Inc.

Inventor： Birju N. Shah ,  Tristan F. Schaap ,  James E. Zmuda ,  Manfred von Willich

IPC: H04L9/12 ,  G06F21/64 ,  H04J3/06 ,  H04L9/32 ,  H04L9/40 ,  H04L9/00 ,  H04L7/00

Abstract: Techniques are disclosed relating to time synchronization in a network. In some embodiments, an apparatus includes a first circuit having a first clock configured to maintain a local time value for a node coupled to a network. The first circuit is configured to send a first message to a second circuit. The first message includes a first nonce. The second circuit has a second clock that maintains a reference time value for the network. The first circuit receives a second message from the second circuit, the second message including a second nonce and is associated with a timestamp identifying the reference time value. The first circuit compares the first nonce to the second nonce to determine whether the timestamp is valid and, in response to determining that the timestamp is valid, uses the timestamp to synchronize the first clock with the second clock.