US 2015/0103818 A1 · TRANSPORT AND ERROR COMPENSATION OF A GLOBALLY SYNCHRONIZED TIME-BASE

Abstract

Synchronization of communication events according to a global time base (GTB). Devices implementing the GTB may be configured to awaken and exchange discovery and service capability information over pre-scheduled channels at time points determined according to the GTB. The GTB may be correlated to Global Positioning System (GPS) system time. A global time server (GTS) is described for providing a local source of accurate clock time relative to the GTB. The GTS may aggregate multiple sources of absolute and/or relative time including GPS and WWAN, select the most accurate source for a mobile environment, track source state transitions, and manage clock drift. Global time clients (GTCs) may receive updates from the GTS and compute offsets for communication events relative to a local clock. The GTC may correct for transport errors from transmission of the updated global time value across modules or sub-components of the devices.

Claims30

Dependent claims

A method of compensating a globally synchronized time of a communication device, comprising:

receiving a message from a first module of the device at a second module of the device at a first local time value, the message including a common reference time value of a global time base and a corresponding second local time value;
and
generating a local time compensation offset for compensating local clock time values relative to the global time base based at least in part on a difference between the second local time value and the first local time value.

An apparatus for compensating a globally synchronized time of a communication device, comprising:

a global time server configured to obtain a common reference time value of a global time base and a corresponding first local time value;
a global time client configured to receive a message from the global time server at a second local time value, the message including the common reference time value of the global time base and the corresponding first local time value;
and
means for generating a local time compensation offset for compensating local clock time values relative to the global time base based at least in part on a difference between the second local time value and the first local time value.

1 more element

Dependencies are inferred from the claim text.

Transport and error compensation of a globally synchronized time-base

Life of this patent

Transport and error compensation of a globally synchronized time-base

Life of this patent

Abstract

Claims30