Method and apparatus for facilitating the making of wireless telephone calls

• US 5,479,484 A
• Filed: 05/31/1994
• Issued: 12/26/1995
• Est. Priority Date: 05/31/1994
• Status: Expired due to Fees

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Utano, Ralph, Mukerjee, Sandip
• Primary Examiner(s): Bost, Dwayne D.
• Application Number:
  US08/251,811
• Time in Patent Office: 574 Days
• Field of Search: 379/59, 379/60, 455/33.1, 455/33.2
• US Class Current: 455/432.1
• CPC Class Codes: H04W 8/06 Registration at serving network Location Register, VLR or user mobility server

Abstract

The lack of uniformity for accessing wireless carriers to reach roaming wireless telephones prevents nationwide wireless telephone service from being provided in a seamless manner by an automated system that accesses the roamer access ports to connect a caller to a wireless telephone station in a manner such that the roaming nature of the called wireless telephone station is transparent to the caller. This problem is overcome, by a method for placing a telephone call to a wireless telephone station, method including the steps of: a) storing in a data base an association between respective (i) roamer access ports, (ii) mobile switching centers and (iii) one of a predetermined set of instructions, i.e., rules, which are executed by the machine in order to access wireless telephone service at mobile switching centers: b) receiving an indication of the particular mobile switching center presently serving the wireless telephone station; c) looking up the indication in the data base to retrieve (i) a particular roamer access port associated with the particular mobile switching center serving the wireless telephone at the location and (ii) a rule to access wireless telephone service at the mobile switching center via the roamer access port associated with the mobile switching center; d) placing a call to the roamer access port; and e) executing the instructions of the retrieved rule for the roamer access port so as to cause the mobile switching center to attempt to establish a connection to the wireless telephone station.

Claims

1. A method for use in placing a telephone call to a wireless telephone station, said telephone call being routed by a machine to said wireless telephone station via a roamer access port, the method comprising the steps of:

storing in a data base an association between respective (i) roamer access ports, (ii) mobile switching centers and (iii) predetermined sets of instructions for accessing wireless telephone service at mobile switching centers;

receiving an indication of the particular mobile switching center presently serving the wireless telephone station;

looking up said indication in said data base to retrieve (i) a particular roamer access port associated with the particular mobile switching center serving said wireless telephone at said location and (ii) a particular set of instructions for use in accessing wireless telephone service at said mobile switching center via said roamer access port associated with said mobile switching center;

placing a call to said roamer access port;

executing said instructions of said set to cause said mobile switching center to attempt to establish a connection to said wireless telephone station.

2. The invention as defined in claim 1 wherein said mobile switching center causes said telephone call to be completed to said wireless telephone station.

3. The invention as defined in claim 1 wherein said mobile switching center attempts to connect to said wireless telephone station by transmitting a paging signal thereto.

4. The invention as defined in claim 1 wherein said mobile switching center attempts to connect to said wireless telephone station by transmitting a paging signal thereto only after checking its registration memory and determining that said wireless telephone station was currently being served said mobile switching center.

5. The invention as defined in claim 1 wherein said mobile switching center attempts to connect to said wireless telephone station by requesting mobile switching centers that are adjacent to it to transmit a paging signal to said wireless telephone station.

6. The invention as defined in claim 1 wherein said mobile switching center attempts to connect to said wireless telephone station by requesting adjacent mobile switching centers to transmit a paging signal to said wireless telephone station only after checking its registration memory and determining that said wireless telephone station was not currently being served by said mobile switching center.

7. The invention as defined in claim 1 wherein said sets of instructions each defines a process for determining when said machine is to supply to a roamer access port the mobile identification number of said called wireless telephone station.

8. A method for use in placing a telephone call to a wireless telephone station, said telephone call having to be routed by a machine to said wireless telephone station via a roamer access port, the method comprising the steps of:

storing in a data base an association between respective (i) roamer access ports, (ii) mobile switching centers and (iii) one of a predetermined set of rules for accessing wireless telephone service at mobile switching centers;

receiving an indication of the particular mobile switching center presently serving the wireless telephone station;

looking up said indication in said data base to determine (i) a particular roamer access port associated with the particular mobile switching center serving said wireless telephone at said location and (ii) a rule to access wireless telephone service at said mobile switching center via said roamer access port associated with said mobile switching center;

placing a call to said roamer access port;

applying said determined rule to cause said mobile switching center to attempt to locate said wireless telephone station.