Apparatus, and an associated method, for preserving communication service quality levels during hand-off of communications in a radio communication system

• US 8,493,939 B2
• Filed: 09/13/2012
• Issued: 07/23/2013
• Est. Priority Date: 08/15/2003
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Kezys, Vytautas Robertas, Thornton, Craig William
• Primary Examiner(s): Brandt, Christopher M
• Application Number:
  US13/613,147
• Publication Number:
  US 20130003704A1
• Time in Patent Office: 313 Days
• Field of Search: 370/331, 370/328, 370/338, 455/436, 455/437, 455/442
• US Class Current: 370/331
• CPC Class Codes: H04W 36/02 Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A mobile station is configured to transmit a sequence of data packets over a wireless network. The station includes a data sequence expander. The expander receives an indication of a pending hand-off for the mobile station from a first network access point to a second network access point and estimates an amount of time prior to occurrence of the hand-off. The expander inserts a number of delay packets into the sequence of data packets in response to receiving the indication of the pending hand-off. The number of delay packets is determined based on the estimated amount of time prior to the occurrence of the hand-off such that the insertion of the delay packets into the sequence of data packets will cause a delay that corresponds to the amount of time prior to occurrence of the hand-off.

Claims

1. A method comprising:

transmitting a stream of data packets through a communication channel;

determining that an interruption of the communication channel will occur; and

before the interruption occurs, inserting a number of delay packets into the stream of data packets, the number of delay packets corresponding to an estimated length of time the communication interruption is expected to last.

2. The method of claim 1 wherein the inserting is performed by a mobile communication device.

3. The method of claim 1 wherein the inserting is performed by a proxy server.

4. The method of claim 1 wherein the inserting includes inserting the delay packets into the stream of data packets while the data packets are in a buffer.

5. The method of claim 1 wherein the communication channel is a wireless local area network.

6. The method of claim 5 wherein the interruption is due to a hand-off of a mobile communication device from one network access point to another network access point.

7. The method of claim 1 further comprising:

a receiving device receiving the stream of data packets; and

the receiving device removing the delay packets from the stream after the interruption has ended.

8. A method comprising:

transmitting a stream of data packets through a communication channel;

determining that an interruption of the communication channel will occur; and

before the interruption occurs, inserting delay packets into the stream of data packets to compensate for the expected interruption, the delay packets corresponding to silence and being inserted along the stream of data packets at locations corresponding to periods of silence.

9. The method of claim 8 wherein the inserting is performed by a mobile communication device.

10. The method of claim 8 wherein the inserting is performed by a proxy server.

11. The method of claim 8 wherein the inserting includes inserting the delay packets into the stream of data packets while the data packets are in a buffer.

12. The method of claim 8 wherein the communication channel is a wireless local area network.

13. The method of claim 12 wherein the interruption is due to a hand-off of a mobile communication device from one network access point to another network access point.

14. The method of claim 8 further comprising:

a receiving device receiving the stream of data packets; and

the receiving device removing the delay packets from the stream after the interruption has ended.

15. A method comprising:

receiving a stream of data packets over a communication channel;

determining that delay packets have been inserted into the stream of data packets prior to an interruption of the stream of data packets; and

after the interruption has ended, removing the delay packets from the stream of data packets.

16. The method of claim 15 wherein the receiving and the removing are performed by a mobile communication device.

17. The method of claim 15 wherein the receiving and the removing are performed by a proxy server.

18. The method of claim 15 wherein the removing includes removing the delay packets while the data packets are in a buffer.

19. The method of claim 15 wherein the communication channel is a wireless local area network.

20. The method of claim 15 wherein the removing is performed so as to render the interruption transparent to a recipient end user of the stream of data packets.