Communication apparatus, base station, and network apparatus

1. A communication apparatus, comprising:

a receiver configured to

receive predetermined information from a base station, the predetermined information indicating a corresponding relationship between identification information for identifying multicast data and area identification information for identifying a geographical area; and

receive, based on the predetermined information, predetermined multicast data from the base station, the predetermined multicast data including data from another communication apparatus in a first area in which the communication apparatus is located, and

a transmitter configured to transmit first information to the base station, in response to a fulfillment of a transmission condition of the first information, wherein

the first information is a request to have the base station transmit the predetermined multicast data including data from another communication apparatus in a second area different from the first area, and

the transmission condition is based on at least any one of the following: a distance from a location of the communication apparatus to a boundary of the first area, a time taken for the communication apparatus to reach the boundary of the first area, and the second area being a specific area.

2. The communication apparatus according to claim 1 , the communication apparatus further comprising a controller configured to

specify predetermined area identification information for identifying the first area; and

specify, based on the predetermined information, predetermined identification information associated with the predetermined area identification information,

wherein the receiver receives the predetermined multicast data based on the predetermined identification information.

3. The communication apparatus according to claim 1 , wherein

the predetermined multicast data includes data from a third communication apparatus in an area different from the first area.

4. The communication apparatus according to claim 1 , the first information being a request to have the base station transmit multicast data including data from the communication apparatus in an area different from the first area.

5. The communication apparatus according to claim 4 , wherein

the transmitter is further configured to transmit second information to the base station, the second information indicating that there is no need to transmit the multicast data including the data from the communication apparatus in the second area.

6. The communication apparatus according to claim 1 , further comprising a controller configured to determine the second area, wherein the second area is determined in accordance with at least any one of the following: a position of the communication apparatus, a moving speed of the communication apparatus, and a movement direction of the communication apparatus.

7. The communication apparatus according to claim 1 , wherein

the transmitter is configured to transmit second information to the base station,

the second information indicating that there is no need to transmit the predetermined multicast data including the data from the another communication apparatus.

8. The communication apparatus according to claim 1 , wherein

the receiver is further configured to receive definition information for defining the area identification information from the base station, and

the communication apparatus further comprises a transmitter configured to notify the definition information to a network apparatus configured to determine at least one of a first corresponding relationship and a second corresponding relationship, wherein

the first corresponding relationship is a corresponding relationship between the identification information and the area identification information, and

the second corresponding relationship is a corresponding relationship between the identification information and data to be transmitted as the multicast data.

9. A base station, comprising:

a transmitter configured to

transmit predetermined information to a first communication apparatus, the predetermined information indicating a corresponding relationship between identification information for identifying multicast data and area identification information for identifying a geographical area; and

transmit predetermined multicast data based on the predetermined information, and

a receiver configured to receive first information from the first communication apparatus, wherein

the first information is a request for the base station to transmit the predetermined multicast data including data from another communication apparatus in a second area different from a first area in which the first communication apparatus is located, and

the transmitter is further configured to transmit, to the first communication apparatus, a transmission condition of the first information for the first communication apparatus,

the transmission condition being a condition based on at least any one of the following: a distance from a location of the communication apparatus to a boundary of the first area, a time taken for the communication apparatus to reach the boundary of the first area, and the second area being a specific area.

10. The base station according to claim 9 , further comprising:

a receiver configured to receive data from a second communication apparatus, wherein

the predetermined multicast data includes data from the second communication apparatus and is identified by predetermined identification information, further wherein

the predetermined identification information is associated with predetermined area identification information for identifying an area in which the second communication apparatus is located.

11. The base station according to claim 9 ,

wherein the first information is a request for the base station to transmit multicast data including data from the first communication apparatus in an area different from the first area in which the first communication apparatus is located.

12. The base station according to claim 9 , further comprising

a controller configured to notify definition information for defining the area identification information to a network apparatus configured to determine at least one of a first corresponding relationship and a second corresponding relationship, wherein

the first corresponding relationship is a corresponding relationship between the identification information and the area identification information, and

the second corresponding relationship is a corresponding relationship between the identification information and data to be transmitted as the multicast data.