Adjacent carrier frequency interference avoiding method for cellular system, mobile station, and base station controller

• US 20010016499A1
• Filed: 02/22/2001
• Published: 08/23/2001
• Est. Priority Date: 02/23/2000
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Hamabe, Kojiro
• Granted Patent: US 6,823,187 B2
• Time in Patent Office: Days
• US Class Current: 455/454
• CPC Class Codes: H04B 17/354 Adjacent channel leakage power
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/44 in connection with interruption of transmission
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

This mobile station comprises a circuit for repeating measurement of the received power of the carrier frequencies being transmitted from the base station of 1 and/or the received power of the carrier frequencies being used by another cellular system, a circuit for reporting the result of measurement to the base station of 1, a circuit for changing the carrier frequencies for use in communication according to the notification from the base station of 1, and a circuit for changing the frequency of measurement.

Claims

1. A cellular system comprising at least one base station and at least one mobile station, its adjacent carrier frequency interference avoiding method for use when the cellular system is located in the service area of another cellular system which uses a frequency band adjacent on the frequency axis to the frequency band being used by the cellular system, comprising:

said mobile station repeating measurement of the received power of the carrier frequencies being transmitted from the base station of 1 between which and said mobile station a link is set and/or the received power of the carrier frequencies being used by said another cellular system;

assigning carrier frequencies that are not adjacent on the frequency axis to the carrier frequencies being used by said another cellular system to said mobile station according to the results of said measurement; and

changing the frequency of said measurement according to the results of said measurement.

2. The adjacent carrier frequency interference avoiding method for cellular system as set forth in

claim 1

, comprising:

assigning to said mobile station carrier frequencies that are not adjacent on the frequency axis to the carrier frequencies of said another cellular system if the difference between received power being transmitted from said base station of 1 and the received power of the carrier frequencies of said another cellular system is greater than the first threshold.

3. The adjacent carrier frequency interference avoiding method for cellular system as set forth in

claim 1

, comprising:

changing the frequency of said measurement if the difference between received power being transmitted from said base station of 1 and the received power of the carrier frequencies of said another cellular system is greater than the second threshold.

4. A cellular system comprising at least one base station and at least one mobile station, its adjacent carrier frequency interference avoiding method for use when the cellular system is located in the service area of another cellular system which uses a frequency band adjacent on the frequency axis to the frequency band being used by the cellular system, comprising:

said mobile station repeating measurement of the received power of the carrier frequencies being transmitted from the base station of 1 between which and said mobile station a link is set and/or the received power of the carrier frequencies being used by said another cellular system;

updating the maximum power from said mobile station according to the results of said measurement; and

changing the frequency of said measurement according to the results of said measurement.

5. The adjacent carrier frequency interference avoiding method for cellular system as set forth in

claim 4

, comprising:

updating the maximum power from said mobile station if the difference between received power being transmitted from said base station of 1 and the received power of the carrier frequencies of said another cellular system is greater than the first threshold.

6. The adjacent carrier frequency interference avoiding method for cellular system as set forth in

claim 4

, comprising:

changing the frequency of said measurement if the difference between received power being transmitted from said base station of 1 and the received power of the carrier frequencies of said another cellular system is greater than the second threshold.

7. A mobile station in a cellular system which comprises at least one base station and at least one mobile station including the claimed mobile station, the mobile station constituting a cellular system located in the service area of another cellular system which uses a frequency band adjacent on the frequency axis to the frequency band being used by the cellular system, comprising:

means for repeating measurement of the received power of the carrier frequencies being transmitted from the base station of 1 and/or the received power of the carrier frequencies being used by said another cellular system;

means for reporting information on the results of said measurement to said base station of 1;

means for changing the carrier frequencies used for communication according to the notification from said base station of 1; and

means for changing the frequency of said measurement.

8. The mobile station as set forth in

claim 7

, wherein:

said frequency changing means changes the frequency of measurement according to the results of measurement by said measuring means.

9. The mobile station as set forth in

claim 7

, wherein:

said frequency changing means changes the frequency of measurement according to the notification from said base station of 1.

10. The mobile station as set forth in

claim 7

, wherein:

said frequency changing means

assigns carrier frequencies that are not adjacent on the frequency axis to the carrier frequencies being used by said another cellular system to said mobile station if the difference between received power being transmitted from said base station of 1 and the received power of the carrier frequencies of said another cellular system is greater than the first threshold.

11. The mobile station as set forth in

claim 7

, wherein:

said measurement frequency changing means

changes the frequency of said measurement if the difference between received power being transmitted from said base station of 1 and the received power of the carrier frequencies of said another cellular system is greater than the second threshold.

12. A mobile station in a cellular system which comprises at least one base station and at least one mobile station including the claimed mobile station, the mobile station constituting a cellular system located in the service area of another cellular system which uses a frequency band adjacent on the frequency axis to the frequency band being used by the cellular system, comprising:

means for repeating measurement of the received power of the carrier frequencies being transmitted from the base station of 1 and/or the received power of the carrier frequencies being used by said another cellular system;

means for changing the maximum transmitting power according to the results of measurement; and

means for changing the frequency of measurement.

13. The mobile station as set forth in

claim 12

, wherein:

said frequency changing means changes the frequency of measurement according to the results of measurement by said measuring means.

14. The mobile station as set forth in

claim 12

, comprising:

means for reporting information on the results of said measurement to said base station of 1; and

said frequency changing means changes the frequency of measurement according to the notification from said base station of 1.

15. The mobile station as set forth in

claim 12

, wherein:

said maximum power updating means

changes the frequency of said measurement if the difference between received power being transmitted from said base station of 1 and the received power of the carrier frequencies of said another cellular system is greater than the first threshold.

16. The mobile station as set forth in

claim 12

, wherein:

said measurement frequency changing means

changes the frequency of said measurement if the difference between received power being transmitted from said base station of 1 and the received power of the carrier frequencies of said another cellular system is greater than the second threshold.

17. A mobile station in a cellular system which comprises at least one base station and at least one mobile station including such mobile station, the mobile station constituting a cellular system located in the service area of another cellular system which uses a frequency band adjacent on the frequency axis to the frequency band being used by the cellular system, comprising:

means for repeating measurement of the received power of the carrier frequencies being transmitted from the base station of 1 and/or the received power of the carrier frequencies being used by said another cellular system;

means for reporting information on the results of said measurement to said base station of 1; and

means for changing the maximum transmitting power according to the notification from said base station of 1; and

means for changing the frequency of said measurement.

18. The mobile station as set forth in

claim 17

, wherein:

said frequency changing means changes the frequency of measurement according to the results of measurement by said measuring means.

19. The mobile station as set forth in

claim 17

, wherein:

said frequency changing means changes the frequency of measurement according to the notification from said base station of 1.

20. The mobile station as set forth in

claim 17

, wherein:

said maximum power updating means

changes the frequency of said measurement if the difference between received power being transmitted from said base station of 1 and the received power of the carrier frequencies of said another cellular system is greater than the first threshold.

21. The mobile station as set forth in

claim 17

, wherein:

said measurement frequency changing means

changes the frequency of said measurement if the difference between received power being transmitted from said base station of 1 and the received power of the carrier frequencies of said another cellular system is greater than the second threshold.

22. A base station controller in a cellular system which comprises at least one base station and at least one mobile station, the mobile station being for use in a cellular system located in the service area of another cellular system which uses a frequency band adjacent on the frequency axis to the frequency band being used by the cellular system, comprising:

means for receiving a notification of information from said mobile station concerning the received power at said mobile station of the carrier frequency being transmitting from a base station of 1 and/or the received power at said mobile station of the carrier frequency being used by another cellular system;

means for changing the measuring frequency for said received power at said mobile station according to the notification of information from said mobile station concerning the received power in said mobile station of the carrier frequency being transmitting from a base station of 1 and/or the received power in said mobile station of the carrier frequency being used by another cellular system; and

means for transmitting said measuring frequency to said mobile station.