Radio-resource management system and method thereof, and management apparatus, base station and terminal to be employed for it

• US 7,826,796 B2
• Filed: 12/16/2003
• Issued: 11/02/2010
• Est. Priority Date: 12/24/2002
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Matsunaga, Yasuhiko
• Primary Examiner(s): Nguyen; Tu X
• Application Number:
  US10/735,826
• Publication Number:
  US 20040127191A1
• Time in Patent Office: 2,513 Days
• Field of Search: 455/69, 455/522, 455/3.01, 455/403, 455/436, 455/439, 455/442, 455/67.13, 455/135, 455/161.3, 455/277.2, 455/161, 455/3, 455/445, 455/447, 455/450, 455/63.3
• US Class Current: 455/63.3
• 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 28/16 Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
• CPC Class Codes: H04W 36/142 over the same radio air interface technology
• CPC Class Codes: H04W 36/22 for handling the traffic
• CPC Class Codes: H04W 52/18 TPC being performed according to specific parameters
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 68/005 Transmission of information for alerting of incoming communication

Abstract

Terminals and base stations belonging to service areas 100 to 102 of plural radio operators periodically measure a radio-link quality and an availability ratio of a radio link to notify them to a radio-resource management server 40. The server 40 alters a frequency of the base station, and a transmitted-power quantity of the base station and the terminal based on these measured results to improve the radio-link quality, and reduces interference with a neighboring radio system. When a load is concentrated on a network of a specific radio operator, an instruction of handover is given to the terminal from the server 40 to realize a load distribution within the radio operator, and between the radio operators. When the server 40 detects excessive radio interference between the radio operators, it notifies occurrence of a fault, an interference quantity, a quantity of the transmitted power that the base station should attenuate, and the frequency that the base station should alter to the above radio operator that becomes an interference source.

Claims

1. A radio-resource management method comprising:

a management server receiving radio-link quality information from at least one of a plurality of radio base stations and radio terminals belonging to respective different operators; and

the management server taking alteration control of a frequency that one radio base station of said at least one of a plurality of radio base stations utilizes on the basis of information received from other radio base stations belonging to different operators that use the frequency used by said one radio base station.

2. The radio-resource management method according to claim 1, said radio-resource management method characterized in that said radio-link quality information includes at least a received level of a radio link and a quantity of interference with a neighboring radio system, and that said control step has a step of, in the event that a total of the received levels of other base stations utilizing a frequency identical to the frequency that said radio base station currently utilizes is larger than a total of the received levels of other base stations in the frequency other than the frequency that is currently utilized, out of the frequency that said radio base station can utilize, taking control so as to make an alteration to the frequency other than said frequency that is currently utilized.

3. The radio-resource management method according to claim 1, wherein said radio-link quality information is notified at a predetermined notification period.

4. The radio-resource management method according to claim 3, wherein, in the event that a link quality of the radio link exceeded a predetermined threshold, said notification period is set to be longer than it is set in the event that it is equal to or less than said threshold.

5. The radio-resource management method according to claim 3, wherein, in the event that a distribution value of the link quality of the radio link measured within a constant period exceeded a predetermined threshold, said notification period is set to be longer than it is set in the event that it is equal to or less than said threshold.

6. A radio-resource management method comprising:

a management server receiving radio-link quality information from at least one of a plurality of radio base stations and radio terminals belonging to respective different operators;

detecting an interference state between the operators to take fault-notification control according to this detected result; and

,

the management server taking alteration control of a frequency that one radio base station of said plurality of radio base stations utilizes on the basis of information received from other base stations belonging to different operators that use the frequency used by said one radio base station.

7. The radio-resource management method according to claim 6, said radio-resource management method characterized in that said control step has a step of, in the event that radio interference having a pre-specified value or more from the other radio operator was detected within a network of a certain radio operator, making fault notification to a network management server of the radio operator that is an interference source.

8. The radio-resource management method according to claim 7, wherein said control step has a step of, in addition to said fault notification, making notification of anyone of an interference quantity, a transmitted-power quantity that the radio base station should attenuate, and a frequency that the radio base station should alter, or a combination thereof as well.

9. The radio-resource management method according to claim 6, wherein said radio-link quality information is notified at a predetermined notification period.

10. The radio-resource management method according to claim 9, wherein, in the event that a link quality of the radio link exceeded a predetermined threshold, said notification period is set to be longer than it is set in the event that it is equal to or less than said threshold.

11. The radio-resource management method according to claim 9, wherein, in the event that a distribution value of the link quality of the radio link measured within a constant period exceeded a predetermined threshold, said notification period is set to be longer than it is set in the event that it is equal to or less than said threshold.

12. A radio-resource management apparatus comprising:

a management server configured to receive radio-link quality information from at least one of a plurality of radio base stations and radio terminals belonging to respective different operators;

wherein the management server is configured to take alteration control of a frequency that one radio base station in said plurality of radio base station utilizes on the basis of information received from other base stations belonging to different operators that use the frequency used by said one radio base station.

13. The radio-resource management apparatus according to claim 12, said radio-resource management apparatus characterized in that said radio-link quality information includes at least a received level of a radio link and a quantity of interference with a neighboring radio system, and that said management server has means for, in the event that a total of the received levels of other base stations utilizing a frequency identical to the frequency that said radio base station currently utilizes is larger than a total of the received levels of other base stations in the frequency other than the frequency that is currently utilized out of the frequencies that said radio base station can utilize, taking control so as to make an alteration to the frequency other than said frequency that is currently utilized.

14. A radio-resource management apparatus comprising:

a management server configured to receive radio-link quality information from at least one of a plurality of radio base stations and radio terminals belonging to respective different operators, detect an interference state between the operators to take fault-notification control according to this detected result, and, take control of a frequency that one radio base station in said plurality of radio base stations utilizes on the basis of information received from other base stations belonging to different operators that use the frequency used by said one radio base station.

15. The radio-resource management apparatus according to claim 14, wherein said management server has means for, in the event that radio interference having a pre-specified value or more from the other radio operator was detected within a network of a certain radio operator, making fault notification to a network management server of the radio operator that is an interference source.

16. The radio-resource management apparatus according to claim 15, wherein said management server has means for, in addition to said fault notification, notifying anyone of an interference quantity, a transmitted-power quantity that the radio base station should attenuate, and a frequency that the radio base station should alter, or a combination thereof as well.

17. A computer-readable medium storing a program for causing a computer to execute a control operation of a radio-resource management apparatus in a wireless network system, said program characterized in including a frequency control step of, based on radio-link quality information received from at least one of radio base stations and radio terminals belonging to respective different operators, taking alteration control of a frequency that one radio base station utilizes on the basis of information relating to other base stations belonging to different operators that use the frequency used by said one radio base station.

18. A computer-readable medium storing a program for causing a computer to execute a control operation of a radio-resource management apparatus in a wireless network system, said program characterized in including a step of, based on radio-link quality information to be notified from at least one of radio base stations and radio terminals belonging to respective different operators, notifying one of the radio base stations of an occurrence of a fault and an interference quantity, a transmitted-power quantity that the one radio base station should attenuate, and a frequency that the one radio base station should alter, or a combination thereof to a network management server of the radio operator that is an interference source in the event that radio interference having a pre-specified value or more from the other radio operator was detected within a network of a certain radio operator, and, taking alteration control of a frequency that said one radio base station utilizes on the basis of information relating to other base stations belonging to different operators that use the frequency used by said one radio base station.

19. A computer-readable medium storing a program for causing a computer to execute a control operation of one radio base station in a wireless network system including a radio-resource management apparatus for managing a radio resource, and radio base stations belonging to a plurality of respective different radio operators, said program characterized in including the steps of:

measuring a quality of a radio link to notify radio-link quality information that is this measured result to said radio-resource management apparatus; and

in reply to alteration-control notification of a frequency based on said measured result from said radio-resource management apparatus, taking alteration control of a service frequency on the basis of information relating to other base stations belonging to different operators that use the frequency used by said one radio base station.