Emulating an advanced control algorithm in a mobile communications system

• US 5,930,721 A
• Filed: 02/18/1997
• Issued: 07/27/1999
• Est. Priority Date: 02/18/1997
• Status: Expired due to Term

• Current Assignee: Unwired Planet LLC (JP Morgan Chase & Co)
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Westerberg, Erik, Fried, Tomas, Hermansson, Sten
• Primary Examiner(s): Bost, Dwayne D.
• Assistant Examiner(s): GELIN, JEAN ALLAND
• Application Number:
  US08/801,564
• Time in Patent Office: 889 Days
• Field of Search: 455/422, 455/433, 455/435, 455/436, 455/437, 455/450, 455/451, 455/456, 455/464, 455/466, 455/515, 455/552, 455/553, 455/560, 455/561, 370/349, 370/332, 370/328, 370/331, 370/352, 370/353, 370/354, 370/465, 370/466
• US Class Current: 455/466
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 60/00 Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

A telecommunications system and method is disclosed, whereby a packet switched system emulates the location algorithm of a circuit switched system. The packet switched system, wherein cell reselection is performed primarily by the mobile stations, has advanced locating and flexible cell reselection capabilities that cause the packet switched traffic to behave (from a control standpoint) virtually the same, with respect to cell reselection and locating, as the circuit switched traffic. In other words, the packet switched mobile terminals are able to emulate the locating functions of the circuit switched system, which minimizes signal interference between the two systems.

Claims

1. A method for minimizing radio signal interference between a first mobile communication system and a second mobile communications system, comprising the steps of:

broadcasting at least one parameter of a plurality of radio network control parameters associated with said first mobile communication system from a network entity associated with said second mobile communications system to a mobile terminal associated with said second mobile communications system; and

emulating, by said mobile terminal, a first radio network control algorithm of said first mobile communications system in a second radio network control algorithm of said second mobile communication system, using said at least one parameter of said plurality of radio network control parameters.

2. The method of claim 1, wherein said first mobile communications system comprises a circuit switched mobile communications system.

3. The method of claim 2, wherein said second mobile communications system comprises a packet switched mobile communications system.

4. The method of claim 1, wherein said first radio network control algorithm comprises a locating algorithm of a circuit switched mobile communications system.

5. The method of claim 4, wherein said second radio network control algorithm comprises a cell reselection algorithm of said mobile terminal in a packet switched mobile communications system.

6. The method of claim 1, wherein said first radio network control algorithm comprises a first power control algorithm of a circuit switched mobile communications system and said second radio network control algorithm comprises a second power control algorithm of a packet switched mobile communications system.

7. A method for minimizing radio signal interference between a first mobile communications system and a second mobile communications system, comprising the steps of:

broadcasting at least one parameter of a plurality of radio network control parameters associated with said first mobile communication system from a network entity associated with said second mobile communications system to a mobile terminal associated with said second mobile communications system; and

emulating, by said mobile terminal. a first power control algorithm of said first mobile communications system in a second power control algorithm of said second mobile communications system, using said at least one parameter of said plurality of radio network control parameters.

8. A method for minimizing radio signal interference between a circuit switched system and a packet switched system in a mobile communications system, comprising the steps of:

broadcasting at least one parameter of a plurality of radio link control parameters associated with said circuit switched system from a network entity associated with said packet switched system to a mobile terminal associated with said packet switched system; and

emulating, by said mobile terminal, a locating algorithm of said circuit switched system in a cell reselection algorithm of said packet switched system, using said at least one parameter of said plurality of radio link control parameters.

9. The method of claim 8, wherein said circuit switched system comprises the GSM.

10. The method of claim 8, wherein said packet switched system comprises the GPRS.

11. The method of claim 8, wherein the emulating step further comprises the steps of:

determining a path loss criterion for at least one cell of a plurality of neighbor cells;

determining if a signal strength level for a serving cell is less than a predefined threshold level;

calculating a selection criterion for said serving cell and said at least one cell of said plurality of neighbor cells based on said path loss criterion, said calculating including one hysteresis level if said signal strength level for said serving cell is lower than said predefined threshold level, and a second hysteresis level if said signal strength level for said serving cell is equal to or higher than said predefined threshold level; and

selecting a cell with a highest value of a calculated selection criterion.

12. The method of claim 8, wherein said circuit switched system utilizes a hierarchical cell structure.

13. A method for minimizing radio signal interference between a circuit switched mobile communications system and a packet switched mobile communications system, wherein said circuit switched mobile communications system utilizes a hierarchical cell structure, comprising the steps of:

broadcasting a base station identity code, a hierarchical priority level for each of a plurality of said plurality of neighbor cells, and a signal strength level for said each of said plurality of neighbor cells, said base station identity code, said hierarchical priority level and said signal strength level being associated with said circuit switched mobile communications system, from a network entity associated with said packet switched mobile communications system to a mobile terminal associated with said packet switched mobile communications system; and

emulating, by said mobile terminal, a locating algorithm of said circuit switched mobile communications system in a cell reselection algorithm of said packet switched mobile communications system, using said broadcast base station id entity code, said hierarchical priority level for each of said plurality of neighbor cells, and said signal strength level for said each of said plurality of neighbor cells.

14. A system for use in minimizing radio signal interference between a first mobile communications system and a second mobile communications system, comprising:

broadcasting means for broadcasting at least one parameter of a plurality of radio network control parameters associated with said first mobile communications system from a network entity associated with said second mobile communications system to a mobile terminal associated with said second communications system; and

emulating means within said mobile terminal for emulating a first radio network control algorithm of said first mobile communications system in a second radio network control algorithm of said second mobile communications system, using said at least one parameter of said plurality of radio network control parameters.

15. The system of claim 14, wherein said first mobile communications system comprises a circuit switched mobile communications system.

16. The system of claim 15, wherein said second mobile communications system comprises a packet switched mobile communications system.

17. The system of claim 14, wherein said first radio network control algorithm comprises a locating algorithm of a circuit switched mobile communications system.

18. The system of claim 17, wherein said second radio network control algorithm comprises a cell reselection algorithm of a mobile terminal in a packet switched mobile communications system.

19. The system of claim 14, wherein said first radio network control algorithm comprises a first power control algorithm of a circuit switched mobile communications system and said second radio network control algorithm comprises a second power control algorithm of a packet switched mobile communications system.

20. A system for use in minimizing radio signal interference between a circuit switched system and a packet switched system in a mobile communications system, comprising:

broadcasting means for broadcasting at least one parameter of a plurality of radio link network control parameters associated with said circuit switched system from a network entity associated with said packet switched system to a mobile terminal associated with said packet switched system; and

emulating means within said mobile terminal for emulating a locating algorithm of said circuit switched system in a cell reselection algorithm of said packet switched system.

21. The system of claim 20, wherein said emulating means utilizes said at least one parameter of said plurality of radio link network control parameters to emulate said locating algorithm.

22. The system of claim 20, wherein said circuit switched system comprises the GSM.

23. The system of claim 20, wherein said packet switched system comprises the GPRS.