Registration and connection in a communication network

• US 5,680,440 A
• Filed: 06/07/1995
• Issued: 10/21/1997
• Est. Priority Date: 08/18/1992
• Status: Expired due to Fees

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Olsson, Johan, Falk, Johan, Swerup, Jan, Jonsson, Bjorn, Ghisler, Walter
• Primary Examiner(s): Bost, Dwayne
• Assistant Examiner(s): TROST IV, WILLIAM GEORGE
• Application Number:
  US08/478,758
• Time in Patent Office: 867 Days
• Field of Search: 379/58, 379/59, 379/60, 379/57, 455/33.1, 455/33.2, 455/54.1, 455/56.1
• US Class Current: 455/432.1
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]
• CPC Class Codes: H04W 8/12 between location registers or mobility servers
• CPC Class Codes: H04W 84/16 WPBX [Wireless Private Branch Exchange]

Abstract

A mobile radio network includes a number of mobile radio systems, each having a mobile radio services switching center which conveys calls between a number of cordless subscribers and a public switched telephone network which is common to the mobile radio systems which convey calls between a number of cordless subscribers, and a public switched telephone network which is common to the mobile radio systems which convey calls between wire-connected subscribers and also to the cordless subscribers via the mobile radio switching centers. If a cordless subscriber has roamed from its home system to a visitor system, a call from a third system can be transferred generally over the home system and the public network to the subscriber. A service node is assigned to each of the mobile radio systems and each such node keeps an account of where the home subscribers of respective mobile radio systems are located and, in cooperation with other service nodes, can connect a call from a subscriber in the third mobile radio system to the roaming subscriber without needing to load the remaining systems. The system also includes corresponding connection procedures, a subscriber telephone set and a method of registration in the network.

Claims

1. A communication network comprising:

first, second and third mobile radio systems serving respective first, second and third areas, each of the first, second and third mobile radio systems including a mobile radio services switching center;

a land-based public switched telephone network, connected to each of the first, second and third mobile radio services switching centers, for performing teletraffic services with the first, second and third areas; and

first, second and third telecommunication node means in respective correspondence with the first, second and third mobile radio systems and connected to the public switched telephone network, each one of the first, second and third telecommunication node means being directly accessible to a caller by means of the public switched telephone network without requiring a connection through any of the first, second and third mobile radio systems, and each one of the telecommunication node means comprising;

first means for storing called subscriber home system functional information pertaining to a called subscriber having a home system that is the corresponding one of the first, second and third mobile radio systems;

second means for storing called subscriber addressing information for routing a call to a visiting system into which the called subscriber has roamed;

communication means for communicating with the called subscriber in order to receive the called subscriber addressing information; and

switch means, responsive to said one of the first, second and third telecommunication node means being accessed by the caller, for establishing a connection between the caller and the called subscriber, wherein;

the switch means includes means for communicating the called subscriber addressing information with another of the telecommunication node means; and

the established connection bypasses the called subscriber'"'"'s home system and includes a connection between at least one of the first, second and third telecommunication node means and the called subscriber.

2. The communication network of claim 1, wherein each of the first, second and third mobile radio systems further includes a home location register for storing information relating to the location of the associated called subscriber and for providing the stored information to the mobile radio services switching center of a respective one of the first, second and third mobile radio systems,

and wherein the communication network includes first, second and third superior home location registers in respective correspondence with the first, second and third mobile radio systems, for storing the called subscriber addressing information of the associated called subscriber of the corresponding one of the first, second and third mobile radio systems, each of the first, second and third superior home location registers operating independently of the first, second and third mobile radio systems.

3. The communication network of claim 2, wherein each of the first, second and third superior home location registers is located within a corresponding one of the first, second and third telecommunication node means.

4. The communication network of claim 2, wherein the first, second and third superior home location registers are disposed at a central location that is accessible to each of the first, second and third telecommunication node means.

5. The communication network of claim 1, wherein:

each of the first, second and third telecommunication node means is an exchange having an incoming and an outgoing communication route, each coupled to the public switched telephone network;

the called subscriber of the second telecommunication node means has roamed into the third mobile radio system, whereby the third mobile radio system becomes the called subscriber'"'"'s visiting system;

in response to the caller accessing the first telecommunications node means for the purpose of establishing the connection between the caller and the called subscriber of the second telecommunication node means, the first telecommunications node means establishes a signalling route through the public switched telephone network between the first and second telecommunications node means;

the first telecommunications node means uses the signaling route to obtain the called subscriber addressing information from the second telecommunications node means; and

the first telecommunications node means uses the called subscriber addressing information to establish the connection between the caller and the called subscriber, wherein the established connection bypasses the called subscriber'"'"'s home system.

6. The communication network of claim 5, wherein each of the exchanges is an exchange within the public switched telephone network.

7. The communication network of claim 5, wherein at least one of the exchanges is a private automatic branch exchange.

8. In a communication network comprising first, second and third mobile radio systems which are interconnected by a public switched telephone network, a method of establishing a telephone connection between a caller, and a called subscriber whose home system is the second mobile radio system but who has roamed to the third mobile radio system, comprising the steps of:

a) after the called subscriber has roamed into the third mobile radio system, establishing communication between the called subscriber and a second service node that is connected to the public switched telephone network and that corresponds to the second mobile radio system, and then using the communication to convey information for storage into the second service node, the stored information comprising subscriber addressing information for routing a call to the called subscriber in the third mobile radio system;

b) using the public switched telephone network to connect the caller to a first service node that corresponds to the first mobile radio system and that is connected to the public switched telephone network;

c) relaying, from the caller to the first service node, information regarding the identity of the called subscriber;

d) sending, from the first service node to the second service node by means of the public switched telephone network, a query regarding the present location of the called subscriber;

e) sending in response to the query, from the second service node to the first service node, the subscriber addressing information; and

f) using the subscriber addressing information to establish a traffic connection between the caller and the called subscriber, the established traffic connection including a path through the first service node, wherein the established traffic connection bypasses the called subscriber'"'"'s home system.

9. The method of claim 8, wherein the second mobile radio system is the same as the first mobile radio system.

10. The method of claim 8, wherein the step of using the public switched telephone network to connect the caller to the first service node includes using a service number associated with the first service node.

11. In a communication network comprising first, second and third mobile radio systems which are interconnected by a public switched telephone network, the communication network further comprising first, second and third service nodes in respective correspondence with the first, second and third mobile radio systems and each of the first, second and third service nodes being connected to the public switched telephone network for establishing a call between a caller and a called subscriber whose home system is the second mobile radio system but who has roamed to the third mobile radio system, wherein the established call bypasses the called subscriber'"'"'s home system and includes a connection between at least one of the first, second and third service nodes and the called subscriber, a method of registering a mobile telephone set of the called subscriber in the communication network, comprising the steps of:

registering the mobile telephone set with a visitor location register of the third mobile radio system and with a home location register of the second mobile radio system;

accessing, by the mobile telephone set, the third mobile radio system to obtain therefrom information relating to system identity of the third mobile radio system; and

calling, by the mobile telephone set, the second service node and transmitting thereto the obtained information.

12. The method of claim 11, wherein the step of accessing further comprises the step of obtaining from the third mobile radio system a telephone set identity, and the step of transmitting includes the step of transmitting the obtained telephone set identity to the second service node.

13. In a communication network comprising first, second and third mobile radio systems which are interconnected by a public switched telephone network, a method of establishing a telephone connection between a calling subscriber who is served by the first mobile radio system, and a called subscriber whose home system is the second mobile radio system but who has roamed to the third mobile radio system, comprising the steps of:

a) after the called subscriber has roamed into the third mobile radio system, establishing communication between the called subscriber and a first local switch that is connected to the public switched telephone network and that corresponds to the third mobile radio system, and then using the communication to relay, from the called subscriber to the first local switch, subscriber addressing information for routing a call to the called subscriber in the third mobile radio system;

b) using the public switched telephone network to establish a first signalling route between the first local switch and a superior home location register that is connected to the public switched telephone network;

c) using the first signalling route to transfer the subscriber addressing information from the first local switch to the superior home location register;

d) using the public switched telephone network to connect the calling subscriber to a second local switch that is connected to the public switched telephone network and that corresponds to the first mobile radio system;

e) relaying, from the calling subscriber to the second local switch, information regarding the identity of the called subscriber;

f) using the public switched telephone network to establish a second signalling route between the second local switch and the superior home location register;

g) using the second signalling route to transfer the subscriber addressing information from the superior home location register to the second local switch;

h) in the second local switch, using the subscriber addressing information to establish a traffic connection between the calling subscriber and the called subscriber, wherein the established traffic connection bypasses the called subscriber'"'"'s home system.

14. In a communication network comprising first, second and third mobile radio systems which are interconnected by a public switched telephone network, the communication network further comprising a local switch connected to the public switched telephone network and a superior home location register connected to the public switched telephone network, a method of registering a mobile telephone set of a called subscriber whose home system is the second mobile radio system but who has roamed to the third mobile radio system, the method comprising the steps of:

registering the mobile telephone set with a visitor location register of the third mobile radio system and with a home location register of the second mobile radio system;

accessing, by the mobile telephone set, the third mobile radio system to obtain therefrom information relating to system identity of the mobile telephone set in the third mobile radio system; and

calling, by the mobile telephone set, the local switch that is connected to the public switched telephone network and transmitting thereto the obtained information;

using the public switched telephone network to establish a second signalling route between the local switch and the superior home location register that is connected to the public switched telephone network; and

using the second signalling route to transfer the obtained information from the local switch to the superior home location register.

15. A communication network comprising:

first, second and third mobile radio systems serving respective first, second and third areas, each of the first, second and third mobile radio systems including a mobile radio services switching center;

a land-based public switched telephone network, connected to each of the first, second and third mobile radio services switching centers, for performing teletraffic services with the first, second and third areas; and

first, second and third switch means in respective correspondence with the first, second and third mobile radio systems and connected to the public switched telephone network, each one of the first, second and third switch means being directly accessible to a caller by means of the public switched telephone network without requiring a connection through any of the first, second and third mobile radio systems, and each one of the switch means comprising;

first communication means for communicating with the called subscriber in order to receive the called subscriber addressing information;

second communication means for communicating the called subscriber addressing information with telecommunication node means; and

means, responsive to said one of the first, second and third switch means being accessed by the caller, for obtaining the called subscriber addressing information from the telecommunication node means and establishing a connection between the caller and the called subscriber, wherein the established connection bypasses the called subscriber'"'"'s home system and includes a connection between at least one of the first, second and third switch means and the called subscriber; and

the telecommunication node means, connected to the public switched telephone network, the telecommunication node means comprising;

first means for storing called subscriber home system functional information pertaining to a called subscriber having a home system that is one of the first, second and third mobile radio systems;

second means for storing called subscriber addressing information for routing a call to a visiting system into which the called subscriber has roamed; and

communication means for communicating the called subscriber addressing information with the first, second and third switch means.

16. The communication network of claim 15, wherein each of the first, second and third mobile radio systems further includes a home location register for storing information relating to the location of the associated called subscriber and for providing the stored information to the mobile radio services switching center of a respective one of the first, second and third mobile radio systems,

and wherein the telecommunication node means comprises a superior home location register for storing the called subscriber addressing information, the superior home location register operating independently of the first, second and third mobile radio systems.