Method for enabling device to device communication in a radio communications network
Embodiments herein relate to e.g. methods performed in first and second communication devices for enabling device to device communication between the first communication device and the second communication device in a radio communications network. The first communication device transmits data in a first data transmission to the second communication device according to a first transmission pattern. The first communication device also transmits control information with the data to the second communication device, which control information indicates a second transmission pattern for a next data transmission from the first communication device to the second communication device. The second communication device receives the control information with the data in the first transmission. Further embodiments relate to the first and second communication devices.
1. A method performed in a first communication device for enabling device-to-device communication between the first communication device and a second communication device in a radio communications network the method comprising:
transmitting data in a first data transmission to the second communication device according to a first transmission pattern; and
transmitting control information with the data to the second communication device, which control information indicates a second transmission pattern for a next data transmission from the first communication device to the second communication device.
2. The method according to claim 1 , wherein the transmitting control information comprises multiplexing the control information with the data.
3. The method according to claim 1 , wherein the control information is multiplexed with a last packet, a last transport block and/or a last Medium Access Control Protocol Data Unit, MAC PDU, of the data.
4. The method according to claim 1 , wherein the transmitting the control information comprises implicitly transmitting the control information by using a transmission parameter when transmitting the data to the second communication device, which transmission parameter maps to the control information.
5. The method according to claim 4 , wherein the transmission parameter comprises a property of reference sequences used in the first transmission.
6. The method according to claim 1 , wherein the control information indicates a reuse of at least a part of the first transmission pattern.
7. The method according to claim 1 , further comprising
receiving a message from a control node, which message instructs the first communication device to multiplex the control information for the next data transmission with data in the first data transmission.
8. The method according to claim 1 , further comprising
transmitting additional data to the second communication device according to the second transmission pattern in the next data transmission.
9. The method according to claim 1 , further comprising
transmitting to the second communication device, a first scheduling assignment indicating the first transmission pattern.
10. The method according to claim 1 , further comprising
transmitting to the second communication device, a second scheduling assignment indicating the second transmission pattern.
11. The method according to claim 1 , wherein the control information is a scheduling assignment indicating the second transmission pattern.
12. The method according to claim 1 , wherein the first and second transmission patterns indicate allocated radio resources.
13. A method performed in a second communication device for enabling device-to-device communication between a first communication device and the second communication device in a radio communications network; the method comprising:
receiving data in a first data transmission from the first communication device according to a first transmission pattern; and
receiving control information with the data from the first communication device, which control information indicates a second transmission pattern for a next data transmission from the first communication device to the second communication device.
14. The method according to claim 13 , wherein the control information is multiplexed with the data.
15. The method according to claim 13 , wherein the control information is multiplexed with a last packet, a last transport block and/or a last Medium Access Control Protocol Data Unit, MAC PDU, of the data.
16. The method according to claim 13 , wherein the receiving the control information comprises deriving the control information from the received data by determining a transmission parameter used when transmitting the data to the second communication device, which transmission parameter maps to the control information.
17. The method according claim 16 , wherein the transmission parameter comprises a property of reference sequences used in the first transmission.
18. The method according to claim 13 , wherein the control information indicates a reuse of at least a part of the first transmission pattern.
19. The method according to claim 13 , further comprising
configuring settings according to the received control information for receiving the next data transmission.
20. The method according to claim 13 , further comprising
receiving a first scheduling assignment from the first communication device, which first scheduling assignment indicates the first transmission pattern; and
configuring settings for listening for data transmissions in accordance with the received first scheduling assignment.
21. The method according to claim 13 , further comprising
receiving additional data from the first communication device in the next data transmission according to the second transmission pattern.
22. The method according to claim 13 , further comprising
receiving, from the first communication device, a second scheduling assignment indicating the second transmission pattern.
23. The method according to claim 22 , further comprising
comparing the received second scheduling assignment with the received control information; and performing at least one of the following actions based on the comparison: configuring settings to listen for data transmissions in accordance with the received second scheduling assignment and the received control information; ignoring the second transmission pattern when the second transmission pattern indicated by the received control information is inconsistent with the second transmission pattern in the received second scheduling assignment; and prioritizing either the second scheduling assignment or the received control information according to a pre-determined rule.
24. The method according to claim 13 , wherein the control information is a scheduling assignment indicating the second transmission pattern.
25. The method according to claim 13 , wherein the first and second transmission patterns indicate allocated radio resources.
26. A method performed in a control node for enabling device-to-device communication between a first communication device and a second communication device in a radio communications network; the method comprising
transmitting a message to the first communication device, which message instructs the first communication device to multiplex control information for a next data transmission with data in a first data transmission,
wherein the control information indicates a second transmission pattern for the next data transmission from the first communication device to the second communication device.
27. A first communication device for enabling device-to-device communication between the first communication device and a second communication device in a radio communications network wherein the first communication device comprises:
a memory; and
a processing circuitry configured to:
transmit data in a first data transmission to the second communication device according to a first transmission pattern; and to
transmit control information with the data to the second communication device, which control information indicates a second transmission pattern for a next data transmission from the first communication device to the second communication device.
28. A second communication device for enabling device-to-device communication between a first communication device and the second communication device in a radio communications network wherein the second communication device comprises:
a memory; and
a processing circuitry configured to:
receive data in a first data transmission from the first communication device according to a first transmission pattern; and to
receive control information with the data from the first communication device, which control information indicates a second transmission pattern for a next data transmission from the first communication device to the second communication device.
29. A control node for enabling device-to-device communication between a first communication device and a second communication device in a radio communications network wherein the control node comprises:
a memory; and
a processing circuitry configured to:
transmit a message to the first communication device, which message instructs the first communication device to multiplex control information for a next data transmission with data in a first data transmission,
wherein the control information indicates a second transmission pattern for the next data transmission from the first communication device to the second communication device.