System and method for storing communications intended for different groups using a limited amount of space

• US 8,327,045 B1
• Filed: 05/07/2012
• Issued: 12/04/2012
• Est. Priority Date: 12/17/2007
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Woo, Alec, Culler, David E.
• Primary Examiner(s): Lee, Chun-Kuan
• Assistant Examiner(s): Huson, Zachary K
• Application Number:
  US13/465,379
• Time in Patent Office: 211 Days
• Field of Search: None
• US Class Current: 710/52
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06

Abstract

A system and method stores wirelessly received communications for wireless retransmission, making space in a storage device, if necessary, by deleting any one or more communications corresponding to the same group as the received communication. If storage in the storage device remains insufficient, communications that have been previously retransmitted by that same device are deleted, according to one or more characteristics of such stored communications, such as age or number of times an instance of that communication has been received. If storage in the storage device remains insufficient, communications of a different group are deleted according to one or more characteristics of the stored communications.

Claims

1. A method of enabling a wireless device to exchange communications addressed to a group using a group identifier in a sequence of transmissions, the method comprising:

wirelessly receiving a first communication addressed to a group of wireless devices;

identifying a group identifier corresponding to the communication;

determining whether a set of stored communications stored in a storage module include the group identifier;

responsive to a determination that the set of stored communications include the group identifier, increasing a counter associated with each of the stored communications in the set by one;

determining whether sufficient storage exists in the storage module to store the first communication; and

responsive to a determination that sufficient storage does not exist in the storage module to store the first communication;

identifying a subset of communications in the set of stored communications that have the greatest counter value,

selecting a second communication from the subset of the communications,

deleting the second communication, and

storing the first communication.

2. The method of claim 1 wherein the second communication is randomly selected.

3. The method of claim 1 wherein the second communication is selected using a time of receipt.

4. The method of claim 1 wherein the second communication is selected using a number of times an instance of the second communication was received.

5. The method of claim 1, additionally comprising, responsive to a size of the first communication received exceeding a size of the second communication:

identifying a third communication that has not been wirelessly provided by the device that received the communication in response to at least one request to provide such at least one stored communication and that correspond to at least one second characteristic; and

deleting the third communication that has not been wirelessly provided by the device before the storing step.

6. The method of claim 5 wherein the at least one second characteristic is related to a time of receipt.

7. The method of claim 5 wherein the at least one second characteristic is related to a number of times an instance of the second communication that have been wirelessly provided was received.

8. The method of claim 1:

wherein the second communication comprises at least one stored communications corresponding to the group; and

additionally comprising deleting the second communication corresponding to the group.

9. A system configured to enable a wireless device to exchange communications addressed to a group using a group identifier in a sequence of transmissions, the system comprising:

a processor; and

instructions that when executed on the processor cause the processor to perform operations that include;

wirelessly receiving a first communication addressed to a group of wireless devices;

identifying a group identifier corresponding to the communication;

determining whether a set of stored communications stored in a storage module include the group identifier;

responsive to a determination that the set of stored communications include the group identifier, increasing a counter associated with each of the stored communications in the set by one;

determining whether sufficient storage exists in the storage module to store the first communication; and

responsive to a determination that sufficient storage does not exist in the storage module to store the first communication;

identifying a subset of communications in the set of stored communications that have the greatest counter value,

selecting a second communication from the subset of the communications,

deleting the second communication, and

storing the first communication.

10. The system of claim 9 wherein the second communication is randomly selected.

11. The system of claim 9 wherein the second communication is identified using a time of receipt.

12. The system of claim 9 wherein the second communication is identified using a number of times an instance of the second communication was received.

13. The system of claim 9 additionally comprising, responsive to a size of the first communication received exceeding a size of the second communication:

identifying a third communication that has not been wirelessly provided by the device that received the communication in response to at least one request to provide such at least one stored communication and that correspond to at least one second characteristic; and

deleting the third communication that has not been wirelessly provided by the device before the storing.

14. The system of claim 13 wherein the at least one second characteristic is related to a time of receipt.

15. The system of claim 13 wherein the at least one second characteristic is related to a number of times an instance of the second communication that have been wirelessly provided was received.

16. The system of claim 9:

wherein the second communication comprises at least one stored communications corresponding to the group; and

additionally comprising deleting the second communication corresponding to the group.

17. A computer program stored on a non-transitory computer readable medium configured to enable a wireless device to exchange communications addressed to a group using a group identifier in a sequence of transmissions, the computer program comprising:

instructions that when executed on a processor cause the processor to perform operations that include;

wirelessly receiving a first communication addressed to a group of wireless devices;

identifying a group identifier corresponding to the communication;

determining whether a set of stored communications stored in a storage module include the group identifier;

responsive to a determination that the set of stored communications include the group identifier, increasing a counter associated with each of the stored communications in the set by one;

determining whether sufficient storage exists in the storage module to store the first communication; and

responsive to a determination that sufficient storage does not exist in the storage module to store the first communication;

identifying a subset of communications in the set of stored communications that have the greatest counter value,

selecting a second communication from the subset of the communications,

deleting the second communication, and

storing the first communication.

18. The computer program of claim 17 wherein the second communication is randomly selected.

19. The computer program of claim 17 additionally comprising, responsive to a size of the first communication received exceeding a size of the second communication:

identifying a third communication that has not been wirelessly provided by the device that received the communication in response to at least one request to provide such at least one stored communication and that correspond to at least one second characteristic; and

deleting the third communication that has not been wirelessly provided by the device before the storing.

20. The computer program of claim 17:

wherein the second communication comprises at least one stored communications corresponding to the group; and

additionally comprising deleting the second communication corresponding to the group.