Data transfer method and radio terminal for executing transport layer protocol on radio network

• US 20010006512A1
• Filed: 12/27/2000
• Published: 07/05/2001
• Est. Priority Date: 12/27/1999
• Status: Active Grant

• Current Assignee: 2BCom LLC (Markman Advisors LLC)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Tamada, Yuzo, Tomoda, Ichiro, Takabatake, Yoshiaki
• Granted Patent: US 6,982,970 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/65 Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
• CPC Class Codes: H04L 67/14 Session management for real-time applications in data packet communications networks H04L65/1066
• CPC Class Codes: H04W 80/00 Wireless network protocols or protocol adaptations to wireless operation

Abstract

A scheme for realizing AV data transfer processing utilizing the transport layer protocol such as RTP protocol, between radio terminals in a radio system for carrying out data transfer after establishing a logical connection between radio terminals prior to data transfer between radio terminals such as Bluetooth is disclosed. In the case of transferring data packets containing an AV stream and exchanging control packets containing control information regarding transfer of the data packets, different logical channels are assigned to the data packets and the control packet so that the data packets and the control packet are transferred by these different logical channels.

Claims

1. A radio terminal device for use in a radio system for carrying out data transfer after establishing a logical connection between radio terminals prior to data transfer between radio terminals, the radio terminal device comprising:

a logical channel set up unit configured to set up at least one first logical channel for transfer of data packets containing at least one AV stream and acquire information regarding at least one second logical channel set up for the transfer of the data packets at a correspondent radio terminal, and to set up at least one third logical channel for transfer of control packets containing control information regarding transfer of the data packets and acquire information regarding at least one fourth logical channel set up for the transfer of the control packets at the correspondent radio terminal;

a memory unit configured to store a correspondence information including a correspondence between the first logical channel and the second logical channel for the AV stream, and a correspondence between the third logical channel and the fourth logical channel for the control information; and

a packet transmission/reception unit configured to transmit/receive the data packets and the control packets to/from the correspondent radio terminal by using the correspondence information.

2. The radio terminal device of

claim 1

, wherein the data packets contain a single AV stream or one AV stream in which a plurality of single streams are multiplexed, the logical channel set up unit sets up one first logical channel with respect to the single AV stream or the one AV stream and acquires information regarding one second logical channel set up with respect to the single AV stream or the one AV stream, and sets up one third logical channel with respect to the single AV stream or the one AV stream and acquires information regarding one fourth logical channel set up with respect to the single AV stream or the one AV stream.

3. The radio terminal device of

claim 1

, wherein the data packets contain a plurality of AV streams belonging to one AV application, and the logical channel set up unit sets up one first logical channel with respect to each one of the plurality of AV streams separately and acquires information regarding one second logical channel set up with respect to each one of the plurality of AV streams separately.

4. The radio terminal device of

claim 3

, wherein the logical channel set up unit sets up one third logical channel with respect to the plurality of AV streams and acquires information regarding one fourth logical channel set up with respect to the plurality of AV streams.

5. The radio terminal device of

claim 3

, wherein the logical channel set up unit sets up one third logical channel with respect to each one of the plurality of AV streams separately and acquires information regarding one fourth logical channel set up with respect to each one of the plurality of AV streams separately.

6. The radio terminal device of

claim 1

, wherein the packet transmission/reception unit transmits the data packets by using the second logical channel obtained by referring to the correspondence information.

7. The radio terminal device of

claim 1

, wherein the packet transmission/reception unit transmits the control packets by using the fourth logical channel obtained by referring to the correspondence information.

8. The radio terminal device of

claim 1

, wherein the packet transmission/reception unit receives the control packets from the correspondent radio terminal by using the third logical channel.

9. The radio terminal device of

claim 1

, wherein the logical channel set up unit transmits a first connection request containing a channel identifier for identifying the first logical channel set up at the radio terminal device to the correspondent radio terminal, and then receives a first connection response containing a channel identifier for identifying the second logical channel set up at the correspondent radio terminal in response to the first connection request, and

the logical channel set up unit transmits a second connection request containing a channel identifier for identifying the third logical channel set up at the radio terminal device to the correspondent radio terminal, and then receives a second connection response containing a channel identifier for identifying the fourth logical channel set up at the correspondent radio terminal in response to the second connection request.

10. The radio terminal device of

claim 9

, wherein the logical channel set up unit acquires the information regarding the second logical channel from the first connection response and the information regarding the fourth logical channel from the second connection response, and registers the correspondence information into the memory unit according to the information regarding the second logical channel and the information regarding the fourth logical channel as acquired.

11. The radio terminal device of

claim 1

, wherein the logical channel set up unit sets up the first logical channel and the third logical channel collectively, and then transmits a connection request containing information for specifying a group of channel identifiers for identifying the first logical channel and the third logical channel set up at the radio terminal device to the correspondent radio terminal.

12. The radio terminal device of

claim 11

, wherein the logical channel set up unit receives a connection response containing information for specifying a group of channel identifiers for identifying the second logical channel and the fourth logical channel set up at the correspondent radio terminal in response to the connection request.

13. The radio terminal device of

claim 12

, wherein the logical channel set up unit acquires the information regarding the second logical channel and the information regarding the fourth logical channel from the information for specifying the group of identifiers as obtained in the connection response, and registers the correspondence information into the memory unit according to the information regarding the second logical channel and the information regarding the fourth logical channel as acquired.

14. The radio terminal device of

claim 11

, wherein the information for specifying the group of identifiers indicates a prescribed parameter value and a group of functions for generating a prescribed number of channel identifiers from the prescribed parameter value.

15. The radio terminal device of

claim 14

, wherein the group of functions generates the prescribed number of channel identifiers in forms of consecutive channel numbers.

16. The radio terminal device of

claim 1

, wherein the logical channel set up unit notifies information for specifying a group of channel identifiers for identifying the first logical channel and the third logical channel to the correspondent radio terminal and then sets up the first logical channel and the third logical channel collectively.

17. The radio terminal device of

claim 1

, further comprising a notification unit configured to notify the correspondence information stored in the memory unit to the correspondent radio terminal.

18. The radio terminal device of

claim 1

, wherein the logical channel set up unit receives a first connection request containing a channel identifier for identifying the second logical channel set up at the correspondent radio terminal from the correspondent radio terminal, and then transmits a first connection response containing a channel identifier for identifying the first logical channel set up at the radio terminal device to the correspondent radio terminal in response to the first connection request, and the logical channel set up unit receives a second connection request containing a channel identifier for identifying the fourth logical channel set up at the correspondent radio terminal from the correspondent radio terminal, and then transmits a second connection response containing a channel identifier for identifying the third logical channel set up at the radio terminal device to the correspondent radio terminal in response to the second connection request.

19. The radio terminal device of

claim 18

, wherein the logical channel set up unit acquires the information regarding the second logical channel from the first connection request and the information regarding the fourth logical channel from the second connection request, and registers the correspondence information into the memory unit according to the information regarding the second logical channel and the information regarding the fourth logical channel as acquired.

20. The radio terminal device of

claim 1

, wherein the logical channel set up unit receives a notification of information for specifying a group of channel identifiers for identifying the first logical channel and the third logical channel from the correspondent radio terminal and then sets up the second logical channel and the fourth logical channel collectively.

21. The radio terminal device of

claim 1

, further comprising a notification reception unit configured to receive a notification of the correspondence information obtained at the correspondent radio terminal from the correspondent radio terminal and to register the correspondence information into the memory unit according to the notification.

22. The radio terminal device of

claim 1

, wherein the radio system is Bluetooth and the logical channel set up unit sets up and acquires information on logical channels which are LSCAP channels.

23. The radio terminal device of

claim 1

, wherein the AV stream is given by data according to an RTP protocol and the control information is given by data according to an RTCP protocol.

24. A data transfer method in a radio system for carrying out data transfer after establishing a logical connection between radio terminals prior to data transfer between radio terminals, the method comprising the steps of:

setting up at least one first logical channel for transfer of data packets containing at least one AV stream and acquiring information regarding at least one second logical channel set up for the transfer of the data packets at a correspondent radio terminal, and setting up at least one third logical channel for transfer of control packets containing control information regarding transfer of the data packets and acquiring information regarding at least one fourth logical channel set up for the transfer of the control packets at the correspondent radio terminal;

storing a correspondence information including a correspondence between the first logical channel and the second logical channel for the AV stream, and a correspondence between the third logical channel and the fourth logical channel for the control information; and

transmitting/receiving the data packets and the control packets to/from the correspondent radio terminal by using the correspondence information.

25. A computer usable medium having computer readable program codes embodied therein for causing a computer to function as a radio terminal device for use in a radio system for carrying out data transfer after establishing a logical connection between radio terminals prior to data transfer between radio terminals, the computer readable program codes include:

a first computer readable program code for causing said computer to set up at least one first logical channel for transfer of data packets containing at least one AV stream and acquire information regarding at least one second logical channel set up for the transfer of the data packets at a correspondent radio terminal, and to set up at least one third logical channel for transfer of control packets containing control information regarding transfer of the data packets and acquire information regarding at least one fourth logical channel set up for the transfer of the control packets at the correspondent radio terminal;

a second computer readable program code for causing said computer to store a correspondence information including a correspondence between the first logical channel and the second logical channel for the AV stream, and a correspondence between the third logical channel and the fourth logical channel for the control information; and

a third computer readable program code for causing said computer to transmit/receive the data packets and the control packets to/from the correspondent radio terminal by using the correspondence information.