Operating a base station of a radio access network

1. A method for operating a base station of a radio access network, the method comprising:

detecting a first user equipment within a cell served by the base station,

detecting a second user equipment within the cell served by the base station,

receiving from the first user equipment a first indication indicating that the first user equipment has detected the second user equipment within a predefined proximity,

receiving from the second user equipment a second indication indicating that the second user equipment has detected the first user equipment within a predefined proximity, and

sending a relay request to the first user equipment depending on both the first indication and the second indication, the relay request instructing the first user equipment to relay a data communication between the base station and the second user equipment.

2. The method according to claim 1 , further comprising:

determining a first data transmission quality parameter for a data transmission between the base station and the first user equipment,

determining a second data transmission quality parameter for a data transmission between the base station and the second user equipment, and

sending the relay request depending on at least one of the first and second data transmission quality parameters.

3. The method according to claim 1 , further comprising:

receiving from the first user equipment the first indication indicating that the first user equipment has detected the second user equipment within a proximity for a device-to-device communication between the first user equipment and the second user equipment,

receiving from the second user equipment the second indication indicating that the second user equipment has detected the first user equipment within a proximity for a device-to-device communication between the first user equipment and the second user equipment.

4. The method according to claim 3 , further comprising:

receiving from at least one of the first user equipment and the second user equipment a device-to-device data transmission quality parameter for a data transmission of the device-to-device communication between the first user equipment and the second user equipment, and

sending the relay request depending on the device-to-device data transmission quality parameter.

5. The method according to claim 4 , wherein at least one of the first, the second and the device-to-device data transmission quality parameters comprises:

a current data rate of the corresponding data transmission,

a signal-to-noise ratio of the corresponding data transmission, and/or

a frequency band used for the corresponding data transmission.

6. The method according to claim 3 , further comprising:

receiving an acknowledgement from the first user equipment acknowledging the relay request, and

upon receiving the acknowledgement from the first user equipment, sending a redirect information to the second user equipment, the redirect information instructing the second user equipment to transmit the data communication, which is to be transmitted to the base station, via the device-to-device communication to the first user equipment.

7. The method according to claim 1 , further comprising:

transmitting the data communication, which is to be transmitted to the second user equipment, to the first user equipment.

8. The method according to claim 7 , wherein the base station comprises a scheduler for allocating radio resources to radio links between the base station and user equipment within the cell served by the base station, the method further comprising:

configuring the scheduler for transmitting the data communication, which is to be transmitted to the second user equipment, to the first user equipment.

9. A method for operating a second user equipment, the second user equipment being configured to communicate with a radio access network and being arranged within a cell served by a base station of the radio access network, the method comprising:

detecting a first user equipment within a proximity for a device-to-device communication between the first user equipment and the second user equipment, wherein the first user equipment is arranged within the cell served by the base station,

upon detecting the first user equipment, sending to the base station an indication indicating that the second user equipment has detected the first user equipment,

receiving a redirect information from the base station, and

upon receiving the redirect information, transmitting a data communication, which is to be transmitted to the base station, via the device-to-device communication to the first user equipment.

10. A base station for a radio access network, comprising:

a wireless radio interface for communicating wirelessly with a plurality of user equipment within a cell served by the base station, and

a processing device, configured

to detect a first user equipment within the cell served by the base station,

to detect a second user equipment within the cell served by the base station,

to receive from the first user equipment a first indication indicating that the first user equipment has detected the second user equipment within a predefined proximity,

to receive from the second user equipment a second indication indicating that the second user equipment has detected the first user equipment within a predefined proximity, and

to send a relay request to the first user equipment depending on both the first indication and the second indication, the relay request instructing the first user equipment to relay a data communication between the base station and the second user equipment.

11. A communication system, comprising at least one first user equipment, at least one second user equipment, and a base station according to claim 10 .

12. The communication system according to claim 11 , wherein at least one of the first user equipment and the second user equipment comprises at least one device of a group consisting of a mobile phone, a personal digital assistant, a mobile music player, a tablet computer, a laptop computer, a notebook computer, and a navigation system.

13. A second user equipment for a radio access network, comprising:

a wireless radio interface for communicating wirelessly with a base station of the radio access network, and

a processing device, configured

to detect a first user equipment within a proximity for a device-to-device communication between the first user equipment and the second user equipment, wherein the first user equipment is arranged within a cell served by the base station,

upon detecting the first user equipment, to send to the base station an indication indicating that the second user equipment has detected the first user equipment,

to receive a redirect information from the base station, and

upon receiving the redirect information, to transmit a data communication, which is to be transmitted to the base station, via the device-to-device communication to the first user equipment.