MOBILE COMMUNICATION APPARATUS, COMMUNICATION METHOD, AND COMMUNICATION SYSTEM

• US 20110026543A1
• Filed: 07/13/2010
• Published: 02/03/2011
• Est. Priority Date: 07/28/2009
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Fujino, Nobutsugu, Machida, Mamoru, Iida, Ichiro, Moriya, Masayoshi, Nakaya, Yuuta, Yoshida, Makoto, Ushiki, Kazumasa
• Granted Patent: US 8,428,078 B2
• Time in Patent Office: Days
• US Class Current: 370/445
• CPC Class Codes: H04B 17/27 for locating or positioning the transmitter
• CPC Class Codes: H04W 4/029 Location-based management or tracking services
• CPC Class Codes: H04W 4/40 for vehicles, e.g. vehicle-to-pedestrians [V2P]
• CPC Class Codes: H04W 74/0816 with collision avoidance

Abstract

A mobile communication apparatus includes a storage unit that stores therein correspondence information correlating area and transmission resource; an area deducing unit that deduces in which area the mobile communication apparatus is located; a selecting unit that selects the transmission resource correlated, in the correlation information stored by the storage unit, with the area deduced by the area deducing unit; and a transmitter that using the transmission resource selected by the selecting unit, transmits data to a second mobile communication apparatus.

Claims

1. A mobile communication apparatus comprising:

a storage unit that stores therein correspondence information correlating area and transmission resource;

an area deducing unit that deduces in which area the mobile communication apparatus is located;

a selecting unit that selects the transmission resource correlated, in the correlation information stored by the storage unit, with the area deduced by the area deducing unit; and

a transmitter that using the transmission resource selected by the selecting unit, transmits data to a second mobile communication apparatus.

2. The mobile communication apparatus according to claim 1, wherein

the storage unit stores therein the correspondence information that correlates a different transmission resource with each area in which the mobile communication apparatus and the second mobile communication apparatus become hidden nodes with respect to one another.

3. The mobile communication apparatus according to claim 1, wherein

the storage unit stores therein the correspondence information that correlates a different transmission resource with each area that is adjacent to a common area.

4. The mobile communication apparatus according to claim 2, wherein

the storage unit stores therein the correspondence information that correlates with the areas, respectively, transmission resources having times that differ.

5. The mobile communication apparatus according to claim 3, wherein

the storage unit stores therein the correspondence information that correlates with the areas, respectively, transmission resources having times that differ.

6. The mobile communication apparatus according to claim 2, wherein

the storage unit stores therein the correspondence information that correlates with the areas, respectively, transmission resources having frequencies that differ.

7. The mobile communication apparatus according to claim 3, wherein

the storage unit stores therein the correspondence information that correlates with the areas, respectively, transmission resources having frequencies that differ.

8. The mobile communication apparatus according to claim 2, wherein

the storage unit stores therein the correspondence information that correlates with the areas, respectively, transmission resources having codes that are for code division and that differ.

9. The mobile communication apparatus according to claim 3, wherein

the storage unit stores therein the correspondence information that correlates with the areas, respectively, transmission resources having codes that are for code division and that differ.

10. The mobile communication apparatus according to claim 1, wherein

the storage unit stores therein the correspondence information that correlates the same transmission resource with areas that are not adjacent to a common area.

11. The mobile communication apparatus according to claim 1, wherein

the storage unit stores therein sets of the correspondence information, and

the selecting unit alternately selects the sets of the correspondence information and based on the selected set of correspondence information, selects the transmission resource.

12. The mobile communication apparatus according to claim 1, further comprising a controller that executes medium access control within a range of the selected transmission resource selected by the selecting unit, wherein

the transmitter transmits the data, based on the medium access control executed by the controller.

13. The mobile communication apparatus according claim 12, further comprising a measuring unit that measures incoming signal strength of a signal from the second mobile communication apparatus, wherein

the controller executes the medium access control based on the incoming signal strength measured by the measuring unit.

14. The mobile communication apparatus according to claim 1, wherein

the area deducing unit deduces the area, based on coordinate information that is for the mobile communication apparatus and received from a global positioning system.

15. The mobile communication apparatus according to claim 1, further comprising a receiver that receives the correspondence information and stores the received correspondence information to the storage unit.

16. The mobile communication apparatus according to claim 1, wherein if an autonomously managed area in which the data is directly transmitted between the mobile communication apparatus and the second mobile communication apparatus and a centrally managed are in which data transmission by the mobile communication apparatus and the second mobile communication apparatus is controlled by a base station are present,

the storage unit stores therein attribute information indicating for each area, whether the area is the autonomously managed area or the centrally managed area, and

the selecting unit, based on the attribute information stored by the storage unit, determines whether the deduced area is the autonomously managed area or the centrally managed area, and upon determining the deduced area to be the autonomously managed area, selects the transmission resource correlated with the deduced area, and upon determining the deduced area to be the centrally managed area, selects a transmission resource reported by the base station.

17. A communication method for a mobile communication apparatus, comprising:

storing correspondence information correlating area and transmission resource;

deducing in which area the mobile communication apparatus is located;

selecting a transmission resource correlated, in the stored correlation information, with the area deduced at the deducing; and

transmitting data to a second mobile communication apparatus by using the transmission resource selected at the selecting.

18. A communication system comprising a plurality of mobile communication apparatuses that directly transmit data to one another, wherein

each mobile communication apparatus includes:

a storage unit that stores therein correspondence information correlating area and transmission resource;

an area deducing unit that deduces in which area the mobile communication apparatus is located;

a selecting unit that selects the transmission resource correlated, in the stored correspondence information, with the area deduced by the area deducing unit; and

a transmitter that using the transmission resource selected by the selecting unit, transmit data to another mobile communication apparatus.