Method and system for preventing data loss in switching data transmission mode

• US 9,167,283 B2
• Filed: 02/03/2014
• Issued: 10/20/2015
• Est. Priority Date: 02/04/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jin, Jongwon Jin, Kim, Jongkyu, Lee, Heungki
• Primary Examiner(s): NGUYEN BA, HOANG VU A
• Application Number:
  US14/170,942
• Publication Number:
  US 20140223501A1
• Time in Patent Office: 624 Days
• Field of Search: 725/94, 725/93, 725/95, 709/231, 709/232
• US Class Current: 1/1
• CPC Class Codes: H04N 21/23805 Controlling the feeding rate to the network, e.g. by controlling the video pump
• CPC Class Codes: H04N 21/2401 Monitoring of the client buffer
• CPC Class Codes: H04N 21/2408 Monitoring of the upstream path of the transmission network, e.g. client requests monitoring data switching networks utilization H04L43/0876; scheduling or organising the servicing of application requests H04L67/60
• CPC Class Codes: H04N 21/4122 additional display device, e.g. video projector digital output for controlling a plurality of local displays G06F3/1423
• CPC Class Codes: H04N 21/41407 embedded in a portable device, e.g. video client on a mobile phone, PDA, laptop constructional details of equipment or arrangements specially adapted for portable computer application G06F1/1626; arrangements specially adapted for mobile receivers in broadcast systems H04H20/57
• CPC Class Codes: H04N 21/43615 Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals home Audio Video Interoperability [HAVI] data switching networks H04L12/2805
• CPC Class Codes: H04N 21/43637 involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11] arrangements for wireless networking or broadcasting of information in indoor or near-field type systems H04B10/114
• CPC Class Codes: H04N 21/44004 involving video buffer management, e.g. video decoder buffer or video display buffer
• CPC Class Codes: H04N 21/64322 IP
• CPC Class Codes: H04N 21/6587 Control parameters, e.g. trick play commands, viewpoint selection

Abstract

A wireless communication channel operation method and a system of the portable terminal for preventing data loss when switching between different wireless video transmission modes are provided. The method includes transmitting multimedia data to a recipient terminal on a communication channel of a second transmission mode in a wireless video transmission mode, the wireless video transmission mode supporting a first and second transmission modes, receiving buffer state information from the recipient terminal, pausing, when a request for switching to the first transmission mode is detected, transmission of the multimedia data to the recipient terminal, determining the buffer state information, waiting, when the buffer state information indicates presence of multimedia data in a reception buffer of the reception terminal, for completion of playing of the multimedia data in the reception buffer, and switching to the first transmission mode after the multimedia data in the reception buffer is played completely.

Claims

1. A wireless communication channel operation method of a portable terminal, the wireless communication channel operation method comprising:

transmitting multimedia data to a reception terminal on a communication channel of a second transmission mode in a wireless video transmission mode, the wireless video transmission mode supporting a first transmission mode and the second transmission mode;

receiving buffer state information of a reception buffer from the reception terminal;

pausing, when a transmission mode switching request for switching to the first transmission mode is detected, transmission of the multimedia data to the reception terminal;

determining the buffer state information;

waiting, when the buffer state information indicates presence of multimedia data in the reception buffer of the reception terminal, for completion of playing of the multimedia data in the reception buffer; and

switching from the second transmission mode to the first transmission mode after the multimedia data in the reception buffer is played completely.

2. The method of claim 1, further comprising:

switching, when the buffer state information indicates an absence of multimedia data in the reception buffer, from the second transmission mode to the first transmission mode.

3. The method of claim 1, wherein the waiting for the completion of playing of the multimedia data comprises estimating a playback completion time of the multimedia data remaining in the reception buffer of the reception terminal based on the buffer state information.

4. The method of claim 1, wherein the waiting for the completion of playing of the multimedia data comprises:

transmitting an end time notification message including multimedia data playback pause time to the reception terminal; and

receiving a playback complete message notifying of completion of the multimedia data playback to the multimedia data playback pause time from the reception terminal.

5. The method of claim 1, wherein the transmission mode switching request is generated when the multimedia data playback is completed in the portable terminal.

6. The method of claim 1, wherein the communication channel of the first transmission mode is a User Datagram Protocol (UDP) channel, and the communication channel of the second transmission mode is a Transmission Control Protocol (TCP) channel.

7. The method of claim 1, wherein the transmitting of the multimedia data comprises:

establishing, when the wireless video transmission mode is activated, the communication channel of the first transmission mode;

receiving a multimedia data transmission request in a state in which the communication channel of the first transmission mode is established; and

switching from the first transmission mode to the second transmission mode.

8. A wireless communication channel operation method of a terminal, the wireless communication channel operation method comprising:

playing multimedia data received from a transmission terminal on a communication channel of a second transmission mode in a wireless video transmission mode, the wireless video transmission mode supporting a first transmission mode and the second transmission mode;

determining a state of a reception buffer periodically while playing the multimedia data;

transmitting buffer state information generated based on the state of the reception buffer to the transmission terminal; and

reestablishing, when a transmission mode switching request is received from the transmission terminal, the communication channel in the first transmission mode.

9. The method of claim 8, further comprising:

receiving an end time notification message including a multimedia data playback pause time from the transmission terminal;

completing playback of the multimedia data remaining in the reception buffer to the playback pause time; and

transmitting playback complete message notifying of completion of the multimedia data playback to the playback pause time.

10. The method of claim 8, wherein the first transmission mode is User Datagram Protocol (UDP) mode, and the second transmission mode is Transmission Control Protocol (TCP) mode.

11. A wireless communication channel operation system including a transmission terminal and a reception terminal is characterized in that, the wireless communication channel operation system comprising:

the transmission terminal transmits multimedia data to a reception terminal on a communication channel of a second transmission mode in a wireless video transmission mode, the wireless video transmission mode supporting a first transmission mode and the second transmission mode, receives buffer state information of a reception buffer from the reception terminal, pauses, when a transmission mode switching request for switching to the first transmission mode is detected, transmission of the multimedia data to the reception terminal, determines the buffer state information, waits, when the buffer state information indicates presence of multimedia data in the reception buffer of the reception terminal, for completion of playing of the multimedia data in the reception buffer is played completely, and switches from the second transmission mode to the first transmission mode after the multimedia data in the reception buffer is played completely; and

the reception terminal plays multimedia data received from the transmission terminal on the communication channel of the second transmission mode in the wireless video transmission mode, determines a state of the reception buffer periodically while playing the multimedia data, transmits buffer state information generated based on the state of the reception buffer to the transmission terminal, and reestablishes, when a transmission mode switching request is received from the transmission terminal, the communication channel in the first transmission mode.

12. The system of claim 11, wherein the transmission terminal estimates a playback completion time of the multimedia data remaining in the reception buffer of the reception terminal based on the buffer state information.

13. The system of claim 11, wherein the transmission terminal transmits an end time notification message including multimedia data playback pause time to the reception terminal after pausing transmission of the multimedia data;

and

wherein the reception terminal completes playback of the multimedia data remaining in the reception buffer to the multimedia data playback pause time, and transmits playback complete message notifying of completion of the multimedia data playback to the multimedia data playback pause time,

wherein the transmission terminal switches, when the playback complete message is received, from the second transmission mode to the first transmission mode.

14. The system of claim 11, wherein the transmission terminal regards completion of multimedia data playback as a request for switching from the second transmission mode to the first transmission mode.

15. The system of claim 11, wherein the transmission terminal switches, when no multimedia data exists in the reception buffer of the reception terminal, from the second transmission mode to the first transmission mode immediately.

16. The system of claim 11, wherein the first transmission mode is User Datagram Protocol (UDP) mode, and the second transmission mode is Transmission Control Protocol (TCP) mode.

17. The system of claim 11, wherein the transmission terminal establishes, when the wireless video transmission mode is activated, the communication channel of the first transmission mode, switches, when a multimedia data transmission request is received in a state where the communication channel of the first transmission mode is established, from the first transmission mode to the second transmission mode, and transmits the requested multimedia data to the reception terminal in the second transmission mode.