Increasing the capacity of a personal communication service system by multiple connections to individual telephone links

• US 5,758,285 A
• Filed: 11/30/1995
• Issued: 05/26/1998
• Est. Priority Date: 11/30/1995
• Status: Expired due to Term

• Current Assignee: Avaya Incorporated
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Chavez, David Lee Jr., Ross, Michael Ray
• Primary Examiner(s): Bost, Dwayne
• Assistant Examiner(s): WYCHE, MYRON
• Application Number:
  US08/565,476
• Time in Patent Office: 908 Days
• Field of Search: 379/58, 379/59, 379/60, 379/63, 455/33.1, 455/435, 455/436, 455/437, 455/465, 455/466, 455/445, 370/359
• US Class Current: 455/445
• CPC Class Codes: H04W 84/16 WPBX [Wireless Private Branch Exchange]

Abstract

Assigning one telephone link to each wireless set and connecting each of the assigned telephone links to all of a plurality of PCS systems. Each of the PCS systems has a plurality of base stations on which wireless sets can register. When an incoming call is received for a wireless set by a switching system terminating the telephone links, the switching system transmits a new call message on the telephone link assigned to the wireless set. The PCS system on which the wireless set is registered responds to the new call message by establishing a connection from the wireless set to the telephone link. The other PCS systems monitor the state of the call so that if the wireless set physically moves to a base station connected to a new PCS system, the new PCS system can continue the call without interruption or the switching system having to perform any additional operations. Also, the PCS systems can be relatively small. When additional wireless sets are added, it is only necessary to add another PCS system and to connect all of the telephone links identified with wireless sets to the new PCS system.

Claims

1. An apparatus for interconnecting a plurality of wireless telephones to a telecommunication switching system and the telecommunication switching system having a plurality of telephone links each assigned to an individual one of the plurality of wireless telephones, comprising:

a first wireless system having a plurality of base stations;

the first wireless system terminating each of the plurality of telephone links;

the first wireless system that has a first wireless telephone of the plurality of wireless telephones registered on one of the plurality of base stations of the first wireless system responsive to a call set up message received via a first telephone link of the plurality of telephone links assigned to the first wireless telephone for transmitting a first control message to the first wireless telephone;

the first wireless system responsive to the first wireless telephone answering the call for transmitting a second control message to the telecommunication switching system on the first telephone link;

the first wireless system responsive to a third control message from the telecommunication switching system for establishing a first path from the first wireless telephone to the first telephone link; and

a second wireless system having a plurality of base stations and terminating each of the plurality of telephone links responsive to the third control message transmitted by the telecommunication switching system on the first telephone link assigned to the first wireless telephone for recording an active call on another wireless system call state for the first wireless telephone.

2. The apparatus of claim 1 wherein the second wireless system responsive to the first wireless telephone handing off to one of the plurality of base stations of the second wireless system and the call state for the first wireless telephone indicating an active call on another wireless system for transmitting a fourth control message to the telecommunication switching system on the first telephone link;

the second wireless system responsive to a fifth control message from the telecommunication switching system received on the first telephone link for etablishing a second path from the first wireless telephone to the first telephone link; and

the first wireless system responsive to the fifth control message for moving the first path.

3. The apparatus of claim 2 wherein the first wireless system further responsive to the fifth control message for recording an active call on another wireless system call state for the first wireless telephone.

4. The apparatus of claim 3 wherein the plurality of telephone links are ISDN links.

5. A apparatus for interconnecting a plurality of wireless telephones to a telecommunication switching system and the telecommunication switching system having a plurality of telephone links each assigned to an individual one of the plurality of wireless telephones and a first wireless system having a plurality of base stations and terminating each of the plurality of telephone links and a second wireless system having a second plurality of base stations and terminating each of the plurality of telephone links, comprising:

the first wireless system that has a first wireless telephone of the plurality of wireless telephones registered on one of the plurality of base stations of the first wireless system responsive to a call set up message received via a first telephone link of the plurality of telephone links assigned to the first wireless telephone for transmitting a first control message to the first wireless telephone;

the first wireless system responsive to the first wireless telephone answering the call for transmitting a second control message to the telecommunication switching system on the first telephone link;

the first wireless system responsive to the first wireless telephone answering the call for establishing a first path from the first wireless telephone to the first telephone link;

the second wireless system responsive to the first wireless telephone handing off to one of the plurality of base stations of the second wireless system for transmitting a third control message to the telecommunication switching system on the first telephone link and establishing a second path from the first wireless telephone to the first telephone link and;

the first wireless system responsive to loss of communication between one of the plurality of base stations of the first wireless system and the first wireless telephone for removing the first path.

6. The apparatus of claim 5 wherein the plurality of telephone links are analog telephone links.

7. A method for interconnecting a plurality of wireless telephones to a telecommunication switching system and the telecommunication switching system having a plurality of telephone links each assigned to an individual one of the plurality of wireless telephones and a first wireless system having a plurality of base stations and terminating each of the plurality of telephone links and a second wireless system having a second plurality of base stations and terminating each of the plurality of telephone links, the method comprising the steps of:

transmitting a first control message to a first wireless telephone by the first wireless system that has the first wireless telephone of the plurality of wireless telephones registered on one of the plurality of base stations of the first wireless system in response to a call set up message received via a first telephone link of the plurality of telephone links assigned to the first wireless telephone;

transmitting a second control message to the telecommunication switching system on the first telephone link by the first wireless system in response to the first wireless telephone answering the call;

establishing a first path from the first wireless telephone to the first telephone link by the first wireless system in response to a third control message from the telecommunication switching system; and

recording an active call on another wireless system call state for the first wireless telephone by the second wireless system in response to the third control message transmitted by the telecommunication switching system on the first telephone link assigned to the first wireless telephone.

8. The method of claim 7 further comprises the steps of transmitting a fourth control message to the telecommunication switching system on the first telephone link by the second wireless system in response to the first wireless telephone handing off to one of the plurality of base stations of the second wireless system and the call state for the first wireless telephone indicating an active call on another wireless system;

establishing a second path from the first wireless telephone to the first telephone link by the second wireless system in response to a fifth control message from the telecommunication switching system received on the first telephone link; and

removing the first path by the first wireless system in response to the fifth control message.

9. The method of claim 8 further comprises the step of recording an active call on another wireless system call state for the first wireless telephone by the first wireless system further in response to the fifth control message.

10. The method of claim 9 wherein the plurality of telephone links are ISDN links.

11. A method for interconnecting a plurality of wireless telephones to a telecommunication switching system and the telecommunication switching system having a plurality of telephone links each assigned to an individual one of the plurality of wireless telephones and a first wireless system having a plurality of base stations and terminating each of the plurality of telephone links and a second wireless system having a second plurality of base stations and terminating each of the plurality of telephone links, the method comprising the steps of:

transmitting a first control message to a first wireless telephone by the first wireless system that has the first wireless telephone of the plurality of wireless telephones registered on one of the plurality of base stations of the first wireless system in response to a call set up message received via a first telephone link of the plurality of telephone links assigned to the first wireless telephone;

transmitting a second control message to the telecommunication switching system on the first telephone link by the first wireless system in response to the first wireless telephone answering the call;

establishing a first path from the first wireless telephone to the first telephone link by the first wireless system in response to the first wireless telephone answering the call;

transmitting a third control message to the telecommunication switching system on the first telephone link and establishing a second path from the first wireless telephone to the first telephone link by the second wireless system in response to the first wireless telephone handing off to one of the plurality of base stations of the second wireless system and;

removing the first path by the first wireless system in response to loss of communication between one of the plurality of base stations of the first wireless system and the first wireless telephone.

12. The method of claim 11 wherein the plurality of telephone links are analog telephone links.