Methods and apparatus for distributing timing information
Devices including a wireless receiver, e.g., indoor CBSDs, in a local network, e.g. a campus network, monitor for wireless signals conveying synchronization information. Different devices in the local area network may detect wireless signals conveying synchronization information from one or more different sources. A device detecting a source of synchronization information generates and sends a timing signal accuracy report to a switch, e.g. an intelligent IDF switch, included in the local network. The switch receives multiple timing signal accuracy reports, selects a “best” sync source and designates the particular device, e.g., particular CBSD, which reported the best sync source, to be the current master timing device for the local network. The switch communicates the address, e.g., IP address, of the selected master to the devices within the local network.
1. A method for providing access to timing information, the method comprising:
operating a switch to receive a plurality of timing signal accuracy reports, from a plurality of wireless devices, the plurality of timing signal accuracy reports including a first timing signal accuracy report sent from a first wireless device and a second timing signal accuracy report sent from a second wireless device;
operating the switch to select one of the wireless devices from which a timing signal accuracy report was received to act as a timing signal master device; and
operating the switch to communicate an address of the timing signal master device to devices which use timing synchronization information.
2. The method of claim 1 , further comprising:
operating the switch to select a sync source from among a plurality of alternative reported sync sources.
3. The method of claim 1 , further comprising:
operating the switch to send a timing master designation message to the selected wireless device which is to act as the timing signal master device.
4. The method of claim 3 , wherein said timing master designation message includes information indicating a selected sync source to be used by the timing signal master device for distribution of timing signal information.
5. The method of claim 1 , further comprising:
operating the timing signal master device to generate sync messages based on timing information received from a selected sync source to be used by the timing signal master device for distribution of timing signal information.
6. The method of claim 2 , further comprising:
operating the switch to send a timing master designation message to the selected wireless device indicating that the selected wireless device is the timing signal master device.
7. The method of claim 5 , further comprising:
operating the first wireless device to monitor for wireless signals conveying sync information, said monitoring including monitoring for one or more of: i) evolved Multimedia Broadcast Multicast Service (eMBMS) wireless signals communicating sync information in an IP multicast; ii) WIFI synchronization signals; iii) priority access license (PAL) band synchronization signals; iv) general authorized access band synchronization signals and v) Wireless Internet Service Providers (WISP) signals.
8. The method of claim 5 , wherein operating the first wireless device to monitor for wireless signals conveying sync information includes operating the first wireless device to monitor at least three of: i) eMBMS wireless signals communicating sync information in an IP multicast; ii) WIFI synchronization signals; iii) priority access license (PAL) band synchronization signals; iv) general authorized access band synchronization signals and v) Wireless Internet Service Providers (WISP) signals.
9. The method of claim 2 , wherein said plurality of timing signal accuracy reports includes a first timing signal accuracy report including: information identifying one or more timing signal sources detected by the first wireless device, said one or more timing signal sources detected by the first wireless device including a first timing signal source, said first timing signal accuracy report including for the first timing signal source one or more of: i) frequency synchronization accuracy information, ii) phase synchronization accuracy information, iii) timing synchronization accuracy information, iv) source protocol information and v) stratum information.
10. The method of claim 9 wherein the first timing signal accuracy report includes at least three of: i) frequency synchronization accuracy information, ii) phase synchronization accuracy information, iii) timing synchronization accuracy information, iv) source protocol information and v) stratum information.
11. The method of claim 9 , wherein said first timing signal accuracy report includes: information identifying two or more timing signal sources detected by the first wireless device, said two or more timing signal sources detected by the first wireless device including said first timing signal source and a second timing signal source, said first timing signal accuracy report including for the second timing signal source one or more of: i) frequency synchronization accuracy information, ii) phase synchronization accuracy information, iii) timing synchronization accuracy information, iv) source protocol information and v) stratum information.
12. The method of claim 2 , wherein operating the switch to select a sync source from among a plurality of alternative reported sync sources includes selecting a PAL source over a GAA source, when reported accuracy is equivalent with respect to the highest accuracy reported PAL source and the highest accuracy reported GAA source.
13. A system for providing access to timing information, the system comprising:
a switch including a first processor configured to:
operate the switch to receive a plurality of timing signal accuracy reports, from a plurality of wireless devices, the plurality of timing signal accuracy reports including a first timing signal accuracy report sent from a first wireless device and a second timing signal accuracy report sent from a second wireless device;
operate the switch to select one of the wireless devices from which a timing signal accuracy report was received to act as a timing signal master device; and
operate the switch to communicate an address of the timing signal master device to devices which use timing synchronization information.
14. The system of claim 13 , wherein said first processor is further configured to:
operate the switch to select a sync source from among a plurality of alternative reported sync sources.
15. The system of claim 13 , wherein said first processor is further configured to:
operate the switch to send a timing master designation message to the selected wireless device which is to act as the timing signal master device.
16. The system of claim 15 , wherein said timing master designation message includes information indicating a selected sync source to be used by the timing signal master device for distribution of timing signal information.
17. The system of claim 13 , further comprising:
said first wireless device including a second processor, said first wireless device being the selected timing signal master device, and
wherein said second processor is configured to:
operate the timing signal master device to generate sync messages based on timing information received from a selected sync source to be used by the timing signal master device for distribution of timing signal information.
18. The system of claim 14 , wherein said first processor is configured to:
operate the switch to send a timing master designation message to the selected wireless device indicating that the selected wireless device is the timing signal master device.
19. The system of claim 17 , wherein said second processor is configured to:
operate the first wireless device to monitor for wireless signals conveying sync information, said monitoring including monitoring for one or more of: i) evolved Multimedia Broadcast Multicast Service (eMBMS) wireless signals communicating sync information in an IP multicast; ii) WIFI synchronization signals; iii) priority access license (PAL) band synchronization signals; iv) general authorized access band synchronization signals and v) Wireless Internet Service Providers (WISP) signals.
20. A non-transitory computer readable medium including computer executable instructions which when executed by a processor of a switch cause the switch to perform the steps of:
operating the switch to receive a plurality of timing signal accuracy reports, from a plurality of wireless devices, the plurality of timing signal accuracy reports including a first timing signal accuracy report sent from a first wireless device and a second timing signal accuracy report sent from a second wireless device;
operating the switch to select one of the wireless devices from which a timing signal accuracy report was received to act as a timing signal master device; and
operating the switch to communicate an address of the timing signal master device to devices which use timing synchronization information.