Reconfiguration in a cellular communications network

• US 5,434,798 A
• Filed: 05/23/1991
• Issued: 07/18/1995
• Est. Priority Date: 05/23/1991
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Nordstrom, Sven G., Waerme, Lars R., Ramstedt, Ake L., Madebrink, Monica B. K., Bergling, Gunilla A., Svensson, Bo G., Roxbergh, Hans J., Dahlin, Jan E. A. S., Taylor, Nils P., Kallin, Harald, Ghisler, Walter, Hoff, Anders C. E.
• Primary Examiner(s): Ramirez, Ellis B.
• Application Number:
  US07/704,397
• Time in Patent Office: 1,517 Days
• Field of Search: 364/514, 455/8, 455/9, 455/15, 455/33.1, 455/33.4, 455/49.1, 455/53.1, 455/54.1, 455/56.1, 395/600, 379/94, 379/60, 379/59, 340/825.30, 340/825.5, 340/825.03, 340/826
• US Class Current: 709/221
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition

Abstract

A method and apparatus for performing reconfiguration of a cellular network is provided. Cell parameters of affected mobile switching centers in the network are copied to a database, and the copied parameters are stored. A set of proposed changes to the stored parameters are prepared and the consistency of the prepared set of proposed changes is verified. Any necessary alterations to the set of proposed changes responsive to the verification are made and the verified set of proposed changes are copied to the affected mobile switching centers. The verified set of proposed changes are then introduced into the network. Additionally, at all times, an up-to-date image of all the cell parameters in all the mobile switching centers in the network is maintained in a system parameter database.

Claims

1. A method of performing reconfiguration of a cellular network comprising a plurality of mobile switching centers, the method comprising:

copying existing cell parameters of selected mobile switching centers in the network to a database, and storing the copied parameters;

preparing a set of proposed changes to the stored parameters;

verifying, via a computer program, the consistency of the prepared set of proposed changes and making any necessary alterations of the set of proposed changes responsive to the verification;

copying, via a data link, the verified set of proposed changes to the selected mobile switching centers; and

introducing the verified set of proposed changes into the plurality of mobile switching centers in the network to reconfigure the cellular network according to the verified set of proposed changes.

2. The method of claim 1, wherein the reconfiguration is temporary and further comprising the step of restoring the network to an original state using the stored cell parameters.

3. The method of claim 1, wherein the copying of cell parameters is initiated periodically by the operator and the set of proposed changes is manually entered.

4. The method of claim 1, wherein the reconfiguration is automatically initiated upon an occurrence of an event and the set of proposed changes is stored in a memory.

5. A method of modifying at least a part of a cellular network, the network comprising an administrative database, at least one switch, and a plurality of cells, the method comprising the steps of:

copying, via a datalink from associated ones of the switches to the administrative database, cell parameters of at least one cell as the parameters are stored before a proposed modification is implemented;

determining at least one change to the cell parameters of the at least one cell affected by the proposed modification;

entering the at least one change into the administrative database;

verifying, via a computer program, the consistency of the entered change;

making any necessary corrections to the at least one change responsive to the verification;

copying the verified/corrected cell parameters to the associated ones of the switches from the administrative database via the data link; and

activating the verified/corrected cell parameters in the associated ones of the switches to introduce the modification into the network.

6. The method of claim 5, wherein the network further includes at least one mobile station and the method further comprises prior to the step of activating, the steps of:

eliminating ongoing calls of the at least one mobile station assigned to the associated cells by handing off ongoing calls to neighboring cells;

inhibiting new calls in the affected cells by using directed retry; and

further comprising, after the step of activating, the step of restarting calls in the affected cells.

7. The method of claim 5, further comprising:

storing a set of parameter changes for at least one base station in the network; and

when a particular base station malfunctions, automatically initiating the modification of the at least part of the cellular network by using the stored set of parameter changes associated with the particular base station in the step of determining.

8. The method of claim 5, further comprising:

storing a set of parameter changes for at least one mobile switching center in the network; and

when a particular mobile switching center malfunctions, automatically initiating the modification of the at least part of the cellular network by using the stored set of parameter changes associated with the particular mobile switching center in the step of determining.

9. The method of claim 5, further comprising:

before the step of activating, ordering routing table changes in any mobile switching centers affected by the modification.

10. The method of claim 5, further comprising:

measuring live traffic in the network after the step of activating; and

optimizing the cell parameters using successive changes responsive to the live traffic measurements.

11. A method of maintaining a system parameter database in a cellular network, comprising:

obtaining, via a data link, current parameter data from at least one mobile switching center in the network;

storing the obtained current parameter data in a data buffer;

generating, via a computer program, a difference list by comparing the stored current parameters with existing data in the system parameter database and storing, in the difference list data which is in the stored current parameter data but not in the existing data, data which is in the existing data but not in the stored current parameter data, and data which has different values in the stored current parameter data as compared with the existing data; and

updating the system parameter database from the difference list.

12. The method of claim 11, wherein the step of updating comprises:

deleting data from the system parameter database which is in the existing data but not the stored current parameter data;

adding data into the system parameter database which is in the stored current parameter data but not in the existing data; and

updating data in the system parameter database for which different values were found.

13. The method of claim 11, wherein the maintenance of the system parameter database is performed on a periodic basis.

14. The method of claim 11, wherein the maintenance of the system parameter database is performed upon occurrence of a predetermined event.

15. An apparatus for providing temporary communication service to a predetermined area in a cellular radio system in response to a communication need at a predetermined time, comprising:

a base station located near the predetermined area in need of communication service; and

means connected to the system for copying a plurality of system changes, which are required to connect the base station to the system and which affect at least one mobile switching center, from a memory to the affected mobile switching centers in the network and for introducing the plurality of system changes into the system to provide service to the predetermined area at the predetermined time.

16. The apparatus of claim 15, wherein said means for implementing comprises means for verifying the consistency of the plurality of changes.

17. An apparatus for performing reconfiguration of a cellular network, said network including at least one cell connected to at least one mobile switching center, said apparatus comprising:

at least one mobile switching center database for storing a plurality of cell parameters;

a system parameter database connected to the at least one mobile switching center database for storing an up-to-date image of cell parameters in the network;

buffer memory means connected to the at least one mobile switching center database and the system parameter database for storing at least one cell parameter change to be used to update the system parameter database; and

a temporary database connected to the system parameter database for temporarily storing proposed cell parameter changes to be introduced into the network to reconfigure the cellular network.

18. The apparatus of claim 17, further comprising means for updating the system parameter database from the at least one cell parameter stored in the buffer memory means, said means being connected to the system parameter database and buffer memory means, and being responsive to an update command.

19. The apparatus of claim 18, wherein the means for updating comprises:

means for creating a difference list by comparing the at least one cell parameter in the buffer means with the cell parameters stored in the system parameter database, and storing in the difference list any cell parameter which is in the system parameter database and not in the buffer means, any cell parameter which is in the buffer memory means and not in the system parameter database, and any cell parameter for which the value in the buffer memory means is different than the value in the system parameter database.

20. A method of performing maintenance of parameters within a cellular network, the network comprising at least one switch, and a plurality of cells, the method comprising:

copying data from at least one switch affected by the maintenance into a buffer memory;

updating data in a system parameter database from the data in the buffer memory, the step of updating comprising maintaining an up-to-date image of the network in the system parameter database.

21. The method of claim 20, wherein the step of updating comprises:

generating a difference list by comparing the data in the system parameter database with the data in the buffer memory and storing in the difference list data, which is in the system parameter database and not in the buffer memory, data which is in buffer memory and not in the system parameter database, and data which has different values in the system parameter database as compared with the buffer memory; and

updating the system parameter database from the different list.

22. The method of claim 21, wherein the step of updating from the difference list comprises:

deleting data from the system parameter database which is in the system parameter database and not in the buffer memory;

adding data to the system parameter database which is in the buffer memory and not in the system parameter database; and

updating data in the system parameter database for which different values are found.

23. The method of claim 20, further comprising:

copying the data in the system parameter database into a temporary database;

making changes to the data stored in the temporary database;

performing at least one consistency verification procedure on the changed data stored in the temporary database; and

transferring the verified data to the at least one switch affected by the maintenance.

24. The method of claim 23, wherein the step of performing comprises, for any data that fails the at least one consistency verification procedure, making any necessary correction to the data, and the step of transferring comprises when the data passes the at least one consistency verification procedure, translating the data to appropriate commands and sending the commands to the affected at least one switch.

25. The method of claim 23, further comprising measuring live traffic in the network after the step of transferring and optimizing cell parameters in the at least one switch responsive to the live traffic measurements.