Granted Patent B2

US 8,260,966 · App. 13/396,343 · Granted Sep 4, 2012

Abstract

Claims (54)

1. A method performed by a user equipment (UE), comprising the operations of:

determining a first timestamp, the timestamp including a current time;

transmitting a registration request to a peer entity, the registration request including the first timestamp;

receiving a registration response from the peer entity, the registration response including a second timestamp;

receiving a third message from the peer entity, the third message including a third timestamp;

determining a staleness of the third message using the first timestamp, second timestamp, and third timestamp;

when the third message is stale, at least one of ignoring and discarding the third message; and

when the third message is not stale, processing the third message.

2. The method of claim 1 , wherein determining a staleness of the third message using the first, second and third timestamp includes:

determining a difference between the third timestamp and the second timestamp; and

determining a difference between a time at which the third message was received and the first timestamp.

3. The method of claim 1 , wherein determining a staleness of the third message includes comparing a difference between the third timestamp and the second timestamp to a difference between a time at which the third message was received and the first timestamp minus a deviation.

4. The method of claim 1 , wherein the method is stored as a set of instructions on a non-transitory computer readable medium.

5. A method performed by an access point of an access network, comprising the operations of:

determining a first timestamp, the timestamp including a current time;

receiving a registration request from a peer entity, the registration request including the first timestamp;

transmitting a registration response to the peer entity, the registration response including a second timestamp;

receiving a third message from the peer entity, the third message including a third timestamp;

determining a staleness of the third message using the first timestamp, second timestamp, and third timestamp;

when the third message is stale, at least one of ignoring and discarding the third message; and

when the third message is not stale, processing the third message.

6. The method of claim 5 , wherein determining a staleness of the third message using the first, second and third timestamp includes:

determining a difference between the third timestamp and the second timestamp; and

determining a difference between a time at which the third message was received and the first timestamp.

7. The method of claim 5 , wherein determining a staleness of the third message includes comparing a difference between the third timestamp and the second timestamp to a difference between a time at which the third message was received and the first timestamp minus a deviation.

8. The method of claim 5 , wherein the method is stored as a set of instructions on a non-transitory computer readable medium.

9. A user equipment comprising:

a memory storing instructions; and

a processor configured to execute the instructions for causing performance of a method of:

determining a first timestamp, the timestamp including a current time;

transmitting a registration request to a peer entity, the registration request including the first timestamp;

receiving a registration response from the peer entity, the registration response including a second timestamp;

receiving a third message from the peer entity, the third message including a third timestamp;

determining a staleness of the third message using the first timestamp, second timestamp, and third timestamp;

when the third message is stale, at least one of ignoring and discarding the third message; and

when the third message is not stale, processing the third message.

10. The user equipment of claim 9 , wherein determining a staleness of the third message using the first, second and third timestamp includes:

determining a difference between the third timestamp and the second timestamp; and

determining a difference between a time at which the third message was received and the first timestamp.

11. The user equipment of claim 9 , wherein determining a staleness of the third message includes comparing a difference between the third timestamp and the second timestamp to a difference between a time at which the third message was received and the first timestamp minus a deviation.

12. An access point of an access network, comprising:

a memory storing instructions; and

a processor configured to execute the instructions for causing performance of a method of:

determining a first timestamp, the timestamp including a current time;

receiving a registration request from a peer entity, the registration request including the first timestamp;

transmitting a registration response to the peer entity, the registration response including a second timestamp;

receiving a third message from the peer entity, the third message including a third timestamp;

determining a staleness of the third message using the first timestamp, second timestamp, and third timestamp;

when the third message is stale, at least one of ignoring and discarding the third message; and

when the third message is not stale, processing the third message.

13. The access point of claim 12 , wherein determining a staleness of the third message using the first, second and third timestamp includes:

determining a difference between the third timestamp and the second timestamp; and

determining a difference between a time at which the third message was received and the first timestamp.

14. The access point of claim 12 , wherein determining a staleness of the third message includes comparing a difference between the third timestamp and the second timestamp to a difference between a time at which the third message was received and the first timestamp minus a deviation.

Assignments (8)