METHOD AND SYSTEM FOR LAST GASP DEVICE IDENTIFICATION

• US 20140064110A1
• Filed: 08/31/2012
• Published: 03/06/2014
• Est. Priority Date: 08/31/2012
• Status: Active Grant

• Current Assignee: Lenovo Singapore Pte Limited (Lenovo Group Ltd.)
• Original Assignee: Fujitsu Limited
• Inventors: Viorel, Dorin, Ito, Akira
• Granted Patent: US 8,867,396 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 74/085 collision avoidance
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

A method for device identification includes determining a mass event has occurred in a wireless network from a reception of a plurality of signals each having a last gasp message, sampling a plurality of mapped zones associated with a base station, identifying which mapped zones are associated with a disconnected endpoint in a zone list, determining a length of time of the mass event, and selectively providing the zone list to identify disconnected endpoints based at least upon the length of time of the mass event. Each mapped zone includes a plurality of wireless device endpoints associated with the mapped zone. The sampling includes determining whether any of a subset of the endpoints associated with the given mapped zone are disconnected from the wireless network.

Claims

1. A method for device identification comprising:

determining a mass event has occurred in a wireless network from a reception of a plurality of signals each having a last gasp message (LGM);

sampling a plurality of mapped zones associated with a base station, each mapped zone including a plurality of wireless device endpoints associated with the mapped zone, the sampling including determining whether any of a subset of the endpoints associated with the given mapped zone are disconnected from the wireless network;

identifying which mapped zones are associated with a disconnected endpoint in a zone list;

determining a length of time of the mass event; and

selectively providing the zone list to identify disconnected endpoints based at least upon the length of time of the mass event.

2. The method of claim 1, further comprising:

initializing a polling of each wireless device endpoint previously determined to have been connected to the wireless network, the polling including determining whether each wireless device is presently connected to the wireless network;

determining a length of time of the polling of each wireless device; and

selectively providing the results of the polling of each wireless device to identify disconnected endpoints based on at least upon a comparison of the length of time of the mass event and the length of time of the polling of each wireless device.

3. The method of claim 2, wherein selectively providing the results of polling of each wireless device and the zone list to identify disconnected endpoints includes providing either the results of polling each wireless device or the zone list based upon the comparison of the length of time of the mass event and the length of time of the polling of each wireless device.

4. The method of claim 1, wherein the mapped zones include time advancing zones.

5. The method of claim 1, wherein determining a mass event has occurred includes determining an amount of physical random access channel (PRACH) message collisions.

6. The method of claim 1, wherein the mapped zones are sampled with an associated weight.

7. The method of claim 1, wherein at least one of the sampled mapped zones is unassociated with any received last gasp messages.

8. One or more non-transitory computer-readable media embodying logic that, when executed by a processor, is configured to perform operations comprising:

determining a mass event has occurred in a wireless network from a reception of a plurality of signals each having a last gasp message (LGM);

sampling a plurality of mapped zones associated with a base station, each mapped zone including a plurality of wireless device endpoints associated with the mapped zone, the sampling including determining whether any of a subset of the endpoints associated with the given mapped zone are disconnected from the wireless network;

identifying which mapped zones are associated with a disconnected endpoint in a zone list;

determining a length of time of the mass event; and

selecting the zone list to identify disconnected endpoints based at least upon the length of time of the mass event.

9. The non-transitory media of claim 8, wherein the logic is further configured to cause the processor to perform operations comprising:

initializing a polling of each wireless device endpoint previously determined to have been connected to the wireless network, the polling including determining whether each wireless device is presently connected to the wireless network;

determining a length of time of the polling of each wireless device; and

selecting the results of the polling of each wireless device to identify disconnected endpoints based on at least upon a comparison of the length of time of the mass event and the length of time of the polling of each wireless device.

10. The non-transitory media of claim 9, wherein selectively providing the results of polling of each wireless device and the zone list to identify disconnected endpoints includes providing either the results of polling each wireless device or the zone list based upon the comparison of the length of time of the mass event and the length of time of the polling of each wireless device.

11. The non-transitory media of claim 8, wherein the mapped zones include time advancing zones.

12. The non-transitory media of claim 8, wherein determining a mass event has occurred includes determining an amount of physical random access channel (PRACH) message collisions.

13. The non-transitory media of claim 8, wherein the mapped zones are sampled with an associated weight.

14. The non-transitory media of claim 8, wherein at least one of the sampled mapped zones is unassociated with any received last gasp messages.

15. A base station for wireless communication comprising:

a memory;

a processor coupled to a memory, the processor configured to;

determine a mass event has occurred in a wireless network from a reception of a plurality of signals each having a last gasp message (LGM);

sample a plurality of mapped zones associated with a base station, each mapped zone including a plurality of wireless device endpoints associated with the mapped zone, the sampling including determining whether any of a subset of the endpoints associated with the given mapped zone are disconnected from the wireless network;

identify which mapped zones are associated with a disconnected endpoint in a zone list;

determine a length of time of the mass event; and

select the zone list to identify disconnected endpoints based at least upon the length of time of the mass event.

16. The base station of claim 15, wherein the processor is further configured to:

initialize a polling of each wireless device endpoint previously determined to have been connected to the wireless network, the polling including determining whether each wireless device is presently connected to the wireless network;

determine a length of time of the polling of each wireless device; and

select the results of the polling of each wireless device to identify disconnected endpoints based on at least upon a comparison of the length of time of the mass event and the length of time of the polling of each wireless device.

17. The base station of claim 16, wherein selectively providing the results of polling of each wireless device and the zone list to identify disconnected endpoints includes providing either the results of polling each wireless device or the zone list based upon the comparison of the length of time of the mass event and the length of time of the polling of each wireless device.

18. The base station of claim 15, wherein the mapped zones include time advancing zones.

19. The base station of claim 15, wherein determining a mass event has occurred includes determining an amount of physical random access channel (PRACH) message collisions.

20. The base station of claim 15, wherein at least one of the sampled mapped zones is unassociated with any received last gasp messages.