Frequency selection apparatus, a mobile communications system, and a multi-band frequency resource management method

• US 20050271009A1
• Filed: 05/27/2005
• Published: 12/08/2005
• Est. Priority Date: 05/28/2004
• Status: Active Grant

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Yoshino, Hitoshi, Fukumoto, Satoru, Shirakabe, Masashige
• Granted Patent: US 7,415,275 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A frequency selection apparatus, a mobile communications system, and a multi-band resource management method are disclosed. The frequency selection apparatus includes an acquisition unit configured to collect environmental information about a mobile station for each frequency band according to system frequency bands that a mobile station can use, and a frequency selection unit configured to determine the frequency band to be used and the system to be connected to, based on the environmental information and information provided by the mobile station.

Claims

1. A radio frequency selection apparatus in a plurality of cellular systems using a plurality of frequency bands, comprising:

an information acquisition unit for acquiring environmental information about a mobile station for each of the frequency bands that are available to the mobile station; and

a frequency band determining unit for determining the frequency band to be used, and the system to which the mobile station is to be connected, based on the environmental information and information provided by the mobile station.

2. The radio frequency selection apparatus as claimed in claim 1, further comprising:

a system selection unit for selecting the system that satisfies quality of received signal of the mobile station based on received signal of an uplink; and

a frequency band allocation unit for assigning the frequency band based on the selection result by the system selection unit, and the information provided by the mobile station.

3. The radio frequency selection apparatus as claimed in claim 1, further comprising:

a determination unit for comparing a value contained in the environmental information with a corresponding threshold value;

wherein the frequency band allocation unit assigns the frequency band based on a result of the determination unit.

4. The radio frequency selection apparatus as claimed claim 1, further comprising:

an allocation ratio setting unit for setting up a ratio of traffic to be assigned to each of the frequency bands based on the environmental information.

5. The radio frequency selection apparatus as claimed in claim 2, wherein

the frequency band allocation unit assigns the frequency band based on at least one of SIR criterion, received power criterion, and Doppler shift criterion according to the result of the determination unit.

6. The radio frequency selection apparatus as claimed in claim 2, wherein

the frequency band allocation unit assigns the frequency band based on received power and traffic information.

7. The radio frequency selection apparatus as claimed in claim 1, wherein

the information acquisition unit includes at least one of a received signal acquisition unit, a received signal measurement unit, and a traffic measurement unit.

8. The radio frequency selection apparatus as claimed in claim 3, further comprising:

a threshold setting unit for setting up a threshold based on the information provided by the mobile station and the traffic information.

9. A multi-band resource management method of a plurality of cellular systems using a plurality of frequency bands, comprising:

a step of acquiring environmental information about a mobile station for each of the frequency bands that are available to the mobile station; and

a step of determining the frequency band to be used, and the system to which the mobile station is to be connected, based on the environmental information and information provided by the mobile station.