Call setup in a video telephony network

• US 20060056416A1
• Filed: 04/07/2005
• Published: 03/16/2006
• Est. Priority Date: 09/16/2004
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Yang, Tao, Abrol, Nischal
• Granted Patent: US 8,259,565 B2
• Time in Patent Office: Days
• US Class Current: 370/395.200
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/1106 Call signalling protocols; H.323 and related
• CPC Class Codes: H04Q 11/0457 Connection protocols

Abstract

This disclosure is directed to techniques for video call setup in a mobile video telephony network. In general, the call setup techniques reduce call setup delays by preemptively retransmitting NSRP packets before expiration of the timeout period ordinarily required for receipt of an NSRP ACK packet from the remote terminal. The retransmitted NSRP packets may be retransmitted during idle periods in which the modem layer in the sending mobile terminal has received no other data for transmission of the remote mobile terminal, thereby taking advantage of idle bandwidth. Multiplex data received by the modem can be locally buffered at the modem layer for retransmission. In this manner, retransmission does not require regeneration of the original call setup messages nor multiplexing. Instead, the previously generated and multiplexed data is buffered at the modem layer for retransmission to reduce processing overhead within the mobile terminal.

Claims

1. A method comprising:

transmitting a video call setup packet from a first mobile terminal to a second mobile terminal; and

retransmitting the video call setup packet before expiration of a timeout period for receipt of an acknowledgement packet from the second mobile terminal.

2. The method of claim 1, wherein retransmitting includes retrieving the video call setup packet from a buffer associated with a modem layer in the first mobile terminal, and transmitting the retrieved video call setup packet.

3. The method of claim 1, further comprising storing the video call setup packet in a buffer associated with a modem layer in the first mobile terminal, wherein retransmitting includes retrieving the video call setup packet from the buffer and transmitting the retrieved video call setup packet.

4. The method of claim 3, wherein storing the video call setup packet includes storing a plurality of video call setup packets transmitted by the first mobile terminal.

5. The method of claim 4, wherein the video call setup packets include integrated services digital network (ISDN) packets comprising numbered simple retransmit protocol (NSRP) packet information, and wherein the NSRP packet information comprises ITU H.245 call control messages.

6. The method of claim 4, wherein retransmitting includes:

retrieving a first call setup packet from the buffer;

transmitting the first call setup packet;

retrieving a second call setup packet from the buffer; and

transmitting the second call setup packet.

7. The method of claim 1, wherein retransmitting includes retransmitting the video call setup packet when there is idle bandwidth available within a packet to be transmitted by the first mobile terminal.

8. The method of claim 1, wherein retransmitting includes retransmitting the video call setup packet when a modem of the mobile terminal detects idle bandwidth in a packet generated by the modem.

9. The method of claim 1, further comprising repeating the retransmission of the call setup packet, and terminating the repeated retransmission of the call setup packet upon receipt of the acknowledgement packet from the second mobile terminal.

10. The method of claim 1, further comprising repeating the retransmission of the call setup packet, and terminating the retransmission of the call setup packet upon commencement of a video call or receipt of a stop command.

11. The method of claim 1, further comprising:

transmitting acknowledgement packets to the second mobile terminal in reply to call setup packets received from the second mobile terminal;

determining whether the second mobile terminal is retransmitting call setup packets; and

retransmitting at least some of the acknowledgement packets to the second mobile terminal.

12. The method of claim 11, wherein retransmitting at least some of the acknowledgement packets includes retransmitting the acknowledgement packets if the second mobile terminal is not retransmitting call setup packets.

13. The method of claim 1, wherein the call setup packets comprise ITU H.245 call setup information for setup of ITU H.324M videoconferencing.

14. A wireless mobile terminal comprising:

a wireless transmitter;

a wireless receiver; and

a modem that generates a video call setup packet for transmission to a second mobile terminal via the transmitter, and submits the video call setup packet for retransmission via the transmitter before expiration of a timeout period for receipt of an acknowledgement packet from the second mobile terminal.

15. The mobile terminal of claim 14, further comprising a buffer to store the video call setup packet, wherein the modem retrieves the video call setup packet from a buffer and submits the retrieved video call setup packet for retransmission to the second mobile terminal via the transmitter.

16. The mobile terminal of claim 14, further comprising a buffer to store the video call setup packet, wherein the modem stores the video call setup packet to the buffer, retrieves the video call setup packet from a buffer and submits the retrieved video call setup packet for retransmission to the second mobile terminal via the transmitter.

17. The mobile terminal of claim 16, wherein the modem stores a plurality of the video call setup packets in the buffer

18. The mobile terminal of claim 17, wherein the video call setup packets include integrated services digital network (ISDN) packets comprising numbered simple retransmit protocol (NSRP) packet information, and wherein the NSRP packet information comprises ITU H.245 call control messages.

19. The mobile terminal of claim 17, wherein the modem is configured to:

retrieve a first video call setup packet from the buffer;

submit the first video call setup packet for retransmission via the transmitter;

retrieve a second call setup packet from the buffer; and

submit the second video call setup packet for retransmission via the transmitter.

20. The mobile terminal of claim 14, wherein the modem is configured to submit the video call setup packet for retransmission via the transmitter when there is idle bandwidth available within a packet to be transmitted by the first mobile terminal.

21. The mobile terminal of claim 14, wherein the modem is configured to repeat the submission of the video call setup packet for retransmission, and terminate the retransmission of the call setup packet upon receipt of the acknowledgement packet from the second mobile terminal.

22. The mobile terminal of claim 14, wherein the modem is configured to repeat the submission of the video call setup packet for retransmission, and wherein the modem terminates the retransmission of the call setup packet upon commencement of a video call or receipt of a stop command.

23. The mobile terminal of claim 14, wherein the modem is configured to submit acknowledgement packets for transmission to the second mobile terminal in reply to call setup packets received from the second mobile terminal.

24. The mobile terminal of claim 23, wherein the modem is configured to retransmit at least some of the acknowledgement packets if the second mobile terminal is not retransmitting call setup packets.

25. The mobile terminal of claim 14, wherein the call setup packets comprise ITU H.245 call setup information for setup of ITU H.324M videoconferencing.

26. A computer-readable medium comprising instructions to cause a processor to:

transmit a video call setup packet from a first mobile terminal to a second mobile terminal; and

retransmit the video call setup packet before expiration of a timeout period for receipt of an acknowledgement packet from the second mobile terminal.

27. The computer-readable medium of claim 26, wherein the instructions cause the processor to store the video call setup packet in a buffer associated with a modem layer in the first mobile terminal, retrieve the video call setup packet from the buffer, and retransmit the retrieved video call setup packet.

28. The computer-readable medium of claim 27, wherein the instructions cause the processor to store a plurality of video call setup packets transmitted by the first mobile terminal in the buffer.

29. The computer-readable medium of claim 28, wherein the video call setup packets include integrated services digital network (ISDN) packets comprising numbered simple retransmit protocol (NSRP) packet information, and wherein the NSRP packet information comprises ITU H.245 call control messages.

30. The computer-readable medium of claim 28, wherein the instructions cause the processor to:

retrieve a first call setup packet from the buffer;

transmit the first call setup packet;

retrieve a second call setup packet from the buffer; and

transmit the second call setup packet.

31. The computer-readable medium of claim 26, wherein the instructions cause the processor to retransmit the video call setup packet when a modem of the mobile terminal detects idle bandwidth in a packet generated by the modem.

32. The computer-readable medium of claim 26, wherein the call setup packets comprise ITU H.245 call setup information for setup of ITU H.324M videoconferencing.

33. A wireless mobile terminal comprising:

a wireless transmitter;

a wireless receiver;

a video CODEC to generate video information;

an audio CODEC to generate audio information;

an ITU H.245 control layer module to generate video call setup packets;

a numbered simple retransmit protocol (NSRP) module to generate one or more NSRP packets based on the video call setup packets;

an ITU H.223 layer module to multiplex the video information, audio information and NSRP packets to produce one or more multiplexed protocol data units (MUX PDUs);

a modem to generate one or more integrated services digital network (ISDN) packets based on the MUX PDUs, submit the ISDN packets to the transmitter for transmission to a second mobile terminal, and submit at least some of the ISDN packets for retransmission via the transmitter before expiration of a timeout period for receipt of an acknowledgement packet from the second mobile terminal via the wireless receiver.

34. The mobile terminal of claim 33, further comprising a buffer, wherein the modem stores at least some of the ISDN packets in the buffer, retrieves the stored ISDN packets from the buffer and submits the retrieved ISDN packets for retransmission to the second mobile terminal via the transmitter.

35. The mobile terminal of claim 34, wherein the modem is configured to submit the retrieved video call setup packet for retransmission via the transmitter when there is idle bandwidth available within a packet to be transmitted by the first mobile terminal.

36. The mobile terminal of claim 33, wherein the modem is configured to repeat the submission of the video call setup packet for retransmission, and terminate the retransmission of the call setup packet upon receipt of the acknowledgement packet from the second mobile terminal.

37. The mobile terminal of claim 33, wherein the modem is configured to repeat the submission of the video call setup packet for retransmission, and wherein the modem terminates the retransmission of the call setup packet upon commencement of video transmission or receipt of a stop command.