Mobile communication system for communicating with an integrated services digital network

• US 6,320,862 B1
• Filed: 04/21/1998
• Issued: 11/20/2001
• Est. Priority Date: 04/22/1997
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Nitta, Toshio
• Primary Examiner(s): Jung, Min
• Application Number:
  US09/063,294
• Time in Patent Office: 1,309 Days
• Field of Search: 370/328, 370/338, 370/401, 370/465, 370/466, 370/467, 370/420, 370/463, 370/524
• US Class Current: 370/401
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 88/16 Gateway arrangements
• CPC Class Codes: H04W 92/02 Inter-networking arrangements
• CPC Class Codes: H04W 92/24 between backbone network devices

Abstract

A mobile communications system includes a switch connected to an inter-working unit and a circuit switching signaling converter. The inter-working unit includes a first terminator for terminating a first transfer procedure of user information for wireless transmission and a first interface to the ISDN for the user information according to ITU-T Recommendation V.110. The circuit switching signaling converter includes a second terminator for terminating a second transfer procedure of a circuit switching signal for wireless transmission and a second interface to the ISDN for the circuit switching signal according to ISDN User Part (ISUP) of common channel signaling system No. 7.

Claims

1. A mobile communications system connected to an integrated services digital network (ISDN), comprising:

a first terminator for terminating a first transfer procedure of user information for wireless transmission;

a second terminator for terminating a second transfer procedure of a circuit switching signal for wireless transmission;

a first interface to the ISDN for the user information according to ITU-T Recommendation V.110; and

a second interface to the ISDN for the circuit switching signal according to ISDN User Part (ISUP) of common channel signaling system No. 7.

2. The mobile communications system according to claim 1, further comprising:

a third interface to the ISDN for user information according to modem information for an analog public switched network; and

a selector for selecting one of the first and third interfaces depending on an opposite party data terminal.

3. The mobile communications system according to claim 2, wherein the second interface selectively transmits a first setup message and a second setup message to the ISDN depending on the opposite party data terminal, the first setup message having an information element set to an unlimited bearer service of 64 kbps, and the second message having the information element set to a 3.1 kHz-Audio bearer service of 64 kbps.

4. The mobile communications system according to claim 3, wherein the selector first selects the first interface and the second interface transmits the first setup message and, if a connection fails to be set up, then the selector selects the third interface and the second interface transmits the second setup message to the ISDN.

5. The mobile communications system according to claim 1, wherein the second interface selectively transmits a first setup message and a second setup message to the ISDN depending on information transfer capability of an opposite party data terminal, the first setup message having an information element set to an unlimited bearer service of 64 kbps, and the second message having the information element set to a 3.1 kHz-audio bearer service of 64 kbps.

6. The mobile communications system according to claim 5, wherein the second interface determines that the opposite party data terminal is connected to an analog public switched network when receiving a call disconnection message from the ISDN after transmitting the first setup message to the ISDN.

7. The mobile communications system according to claim 5, further comprising:

a third interface to the ISDN for user information according to modem information for the analog public switched network; and

a selector for selecting one of the first and third interfaces depending on whether the second interface receives a call disconnection message from the ISDN after transmitting the first setup message to the ISDN.

8. The mobile communications system according to claim 1, wherein a mobile communication switching system comprises the first terminator, the second terminator, the first interface, and the second interface.

9. The mobile communication system according to claim 8, additionally comprising:

a base station configured to receive wireless communications from a mobile station.

10. The mobile communications system according to claim 9, wherein the mobile communication switching system is configured to receive and transmit Link Access Procedure D-channel Mobile (LAPDM) compliant communications to and from the base station.

11. A setup method for setting up a connection between a first data terminal of a mobile communications system and a second data terminal through an integrated services digital network (ISDN), comprising the steps of:

terminating a first transfer procedure of user information for wireless transmission;

converting data and transfer rate of the user information from the wireless transmission to the ISDN according to ITU-T Recommendation V.110;

terminating a second transfer procedure of a circuit switching signal for wireless transmission;

converting the circuit switching signal for wireless transmission to a call control message of the ISDN according to ISDN User Part (ISUP) of common channel signaling system No. 7;

transmitting the call control message to the ISDN; and

setting up a connection between the first data terminal and the second data terminal through the ISDN depending on a response message to the call control message.

12. The setup method according to claim 11, wherein the call control message is one of a first setup message and a second setup message which are selectively transmitted to the ISDN depending on information transfer capability of the second data terminal, the first setup message having an information element set to an unlimited bearer service of 64 kbps, and the second message having the information element set to a 3.1 kHz-audio bearer service of 64 kbps.

13. The setup method according to claim 12, wherein the step of transmitting the call control message comprises the steps of:

transmitting a first setup message to the ISDN; and

when receiving one of DISC and REL messages in response to the first setup message, transmitting a second setup message to the ISDN.

14. A setup method for setting up a connection between a first data terminal of a mobile communications system and a second data terminal through an integrated services digital network (ISDN), comprising the steps of:

terminating a first transfer procedure of user information for wireless transmission;

converting data and transfer rate of the user information from the wireless transmission to the ISDN according to a selected one of ITU-T Recommendation V.110 and modem information for an analog public switched network;

terminating a second transfer procedure of a circuit switching signal for wireless transmission;

converting the circuit switching signal for wireless transmission to a call control message of the ISDN according to ISDN User Part (ISUP) of common channel signaling system No. 7, wherein the call control message is one of a first setup message and a second setup message, the first setup message having an information element set to an unlimited bearer service of 64 kbps, and the second message having the information element set to a 3.1 kHz-audio bearer service of 64 kbps;

transmitting the first setup message to the ISDN with selecting the ITU-T Recommendation V.110;

setting up a connection between the first data terminal and the second data terminal according to the ITU-T Recommendation V.110 when receiving an answer message to the first setup message from the ISDN;

transmitting the second setup message to the ISDN with selecting the modem information for the analog public switched network when receiving one of DISC and REL messages from the ISDN; and

setting up a connection between the first data terminal and the second data terminal through the ISDN and the analog public switched network when receiving an answer message to the second setup message from the ISDN.

15. A mobile communications system connected to an integrated services digital network (ISDN), comprising;

a switch for connecting the mobile communications system and the ISDN;

a base station connected to the switch; and

a mobile subscriber terminal located in a radio zone formed by the base station, for communicating with the base station by radio;

wherein the switch comprises an inter-working unit and a circuit switching signal converter,

the inter-working unit comprising;

a first terminator for terminating a first transfer procedure of user information for wireless transmission; and

a first interface to the ISDN for the user information according to ITU-T Recommendation V.110, and

the circuit switching signal converter comprising;

a second terminator for terminating a second transfer procedure of a circuit switching signal for wireless transmission; and

a second interface to the ISDN for the circuit switching signal according to ISDN User Part (ISUP) of common channel signaling system No. 7.

16. The mobile communications system according to claim 15, wherein the inter-working unit further comprises:

a third interface to the ISDN for user information according to modem information for an analog public switched network; and

a selector for selecting one of the first and third interfaces depending on an opposite party data terminal.

17. The mobile communications system according to claim 15, wherein the second interface selectively transmits a first setup message and a second setup message to the ISDN depending on the opposite party data terminal, the first setup message having an information element set to an unlimited bearer service of 64 kbps, and the second message having the information element set to a 3.1 kHz-Audio bearer service of 64 kbps.

18. The mobile communications system according to claim 17, wherein the selector first selects the first interface and the second interface transmits the first setup message and, if a connection fails to be set up, then the selector selects the third interface and the second interface transmits the second setup message to the ISDN.