Seamless switching of media streams between different networks

• US 7,889,686 B1
• Filed: 06/18/2007
• Issued: 02/15/2011
• Est. Priority Date: 11/21/2006
• Status: Active Grant

• Current Assignee: PICO Mobile Networks Incorporated
• Original Assignee: PicoMobile Networks, Inc. (Marvell Technology Group Limited)
• Inventors: Lambert, Paul Aerick, Chang, Lu
• Primary Examiner(s): Eng; George
• Assistant Examiner(s): KIM, WESLEY LEO
• Application Number:
  US11/764,796
• Time in Patent Office: 1,338 Days
• Field of Search: 455436-453, 455/552.1, 455/553.1, 370/310, 370/331, 370/352, 370260-261, 370/231, 370/235, 348 1401- 1412, 725/62, 725/81, 725/99
• US Class Current: 370/310
• CPC Class Codes: H04L 65/1059 End-user terminal functionalities specially adapted for real-time communication
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1095 Inter-network session transfer or sharing
• CPC Class Codes: H04L 65/752 adapting media to network capabilities

Abstract

The present invention is a system of reception or transmission of media data, such as for audio or video streams, so that data communications alternate transmission or reception routes between available communications networks, choosing among parallel or single communications paths a most efficient and/or most reliable path for transmission of media packets.

Claims

1. A system of parallel wireless communication sessions transmitting a packetized stream of media data having an audio component or a video component, the system comprising:

a mobile device comprising

a first microprocessor having means for establishing and maintaining

communication sessions with two or more wireless networks at the same time, and

communications with a recipient device,

multiple wireless communications modules connected to the first microprocessor, wherein each wireless communications module is adapted to wirelessly communicate with a different communication network, and

means for packetizing a stream of media data stored in a memory of the first microprocessor;

the recipient device comprising

a second microprocessor having means for establishing and maintaining

a communication session with the mobile device, and

a telephone call to the mobile device,

means for performing a coordination function, wherein

duplicate packets, transmitted by the mobile device in a parallel communication to more than one communication network at the same time, arrive at the recipient device at different times, and

a determination is made as to

which communication network has transmitted a most reliable media data stream, and

which communication network has a slowest transmission rater, and

means for transmitting to the mobile device results of operation of the coordination function; and

wherein the mobile device further comprises means for receiving the results of operation of the coordination function, and

(i) terminating the communication session with the communication network with the slowest transmission rate, or

(ii) terminating all communication sessions with communication networks except with the communications network having the most reliable transmission.

2. The system of claim 1, wherein the means for performing the coordination function include

means for comparing timestamps on duplicate packets, and

means for transmitting a message to the mobile device to maintain all communications sessions if the timestamps do not match.

3. The system of claim 1, wherein the means for performing the coordination function include means for matching methods of compression and degrees of compression of packets between communication paths.

4. The system of claim 1, wherein the means for performing the coordination function include means for matching framing of packets between communication paths.

5. The system of claim 1, wherein the means for performing the coordination function include means for matching data rates between communication paths.

6. The system of claim 1, wherein the means for performing the coordination function include means for determining the most reliable communication path.

7. The system of claim 6, wherein the means for performing the coordination function include means for determining a most reliable communication path, and wherein determining the most reliable communication path includes measurement of packet loss.

8. The system of claim 6, wherein the means for performing the coordination function include means for determining a most reliable communication path, and wherein determining the most reliable communication path includes measurement of signal strength.

9. A system comprising:

a recipient device configured to

receive duplicate packets via a plurality of networks, wherein each of the duplicate packets has a corresponding timestamp,

compare timestamps of the duplicate packets, and

determine when the timestamps associated with the duplicate packets match; and

a mobile device configured to

transmit the duplicate packets to the recipient device via the plurality of networks, and

in response to the mobile device having received indication from the recipient device that the timestamps of the duplicate packets match,

(i) transmit remaining packets to the recipient device via one of the plurality of networks selected by the recipient device, and

(ii) terminate transmission of the duplicate packets to the recipient device.

10. The system of claim 9, wherein the recipient device is configured to select the one of the plurality of networks in response to the timestamps of the duplicate packets matching.

11. The system of claim 9, wherein the recipient device is configured to inform the mobile device that the mobile device is to transmit the remaining packets to the recipient device via the one of the plurality of networks in response to the timestamps of the duplicate packet matching.

12. The system of claim 10, wherein the recipient device is configured to select one of the plurality of networks based on at least one of the following criteria associated with the plurality of networks:

method of compression,

data rate,

packet loss, and

signal strength.

13. The system of claim 9, wherein the plurality of networks include a cellular network and a WiFi network.

14. A method comprising:

transmitting duplicate packets from a mobile device to a recipient device via a plurality of networks, wherein each of the duplicate packets has a corresponding timestamp;

receiving the duplicate packets at the recipient device;

comparing timestamps of the duplicate packets received at the recipient device; and

determining when the timestamps of the duplicate packets match;

selecting one of the plurality of networks to receive remaining packets from the mobile device in response to the timestamps of the duplicate packets matching; and

informing the mobile device that the mobile device is to transmit the remaining packets to the recipient device via the one of the plurality of networks when the timestamps match.

15. The method of claim 14, further comprising:

in response to having received indication from the recipient device that the timestamps of the duplicate packets match

(i) transmitting the remaining packets from mobile device to the recipient device via the one of the plurality of networks, and

(ii) terminating transmission of the duplicate packets from mobile device to the recipient device.

16. The method of claim 14, further comprising selecting the one of the plurality of networks based on at least one of the following criteria associated with the plurality of networks:

type of compression, data rate, packet loss, and signal strength.