Transmitting and receiving wireless devices and respective methods performed thereby for transmission of data in a contention based wireless network

1. A method performed by a transmitting wireless device for performing a transmission to a receiving wireless device both wireless devices operating in a wireless network applying a contention-based medium access control protocol, the wireless network operating on a frequency resource, the method comprising:

identifying a control channel of the frequency resource,

contending, at the control channel, for resources on a data channel of the frequency resource, wherein contending for resources comprises transmitting a data-transmission request to the receiving wireless device, and wherein the data-transmission request comprises transmission start time of data transmission, and

when the contention for the resources is successful, transmitting data to the receiving wireless device on the data channel of the frequency resource, wherein the control channel and the data channel operate on separate frequencies of the frequency resource.

2. The method according to claim 1 , wherein identifying the control channel comprises receiving signalling, from the wireless network, indicating which frequency or frequencies the control channel operates on.

3. The method according to claim 1 , wherein when the contention for the resources is unsuccessful, the method further comprising the transmitting wireless device backing-off from contending for the resources on the data channel for a period of time until there is a new contending, at the control channel, for the resources on the data channel of the frequency resource.

4. The method according to claim 3 , wherein the period of time is dependent on a priority of the transmitting wireless device.

5. The method according to claim 1 , wherein the data-transmission request further comprises at least one of the following:

identity of the transmitting wireless device,

identity of the receiving wireless device, and

duration in time of the data transmission.

6. The method according to claim 1 , wherein the data-transmission request further comprises an indication of a portion of the data channel.

7. A method performed by a receiving wireless device for receiving a transmission from a transmitting wireless device both wireless devices operating in a wireless network applying a contention-based medium access control protocol, the wireless network operating on a frequency resource, the method comprising:

identifying a control channel of the frequency resource,

receiving, from the transmitting wireless device, on the identified control channel, a request for performing a transmission to the receiving wireless device on a data channel of the frequency resource,

receiving a reservation confirmation from a third wireless device, wherein the received reservation confirmation comprises information pertaining to a reservation of at least a portion of the data channel for a period of time,

determining that no other conflicting reservation of the data channel of the frequency resource has been performed, wherein the determination is based at least partly on the received reservation confirmation from the third wireless device, and

transmitting, based on the determination, another reservation confirmation at least to the transmitting wireless device.

8. The method according to claim 7 , wherein identifying the control channel comprises receiving signalling, from the wireless network, indicating which frequency or frequencies the control channel operates on.

9. The method according to claim 7 , wherein the received request comprises at least one of the following:

identity of the transmitting wireless device,

identity of the receiving wireless device,

transmission start time of data transmission, and

duration of the data transmission.

10. The method according to claim 7 , wherein the received request comprises an indication of a portion of the data channel.

11. A transmitting wireless device adapted for performing a transmission to a receiving wireless device both wireless devices operating in a wireless network applying a contention-based medium access control protocol, the wireless network operating on a frequency resource, the transmitting wireless device comprising a processor and memory, the memory comprising instructions which when executed by the processor cause the transmitting wireless device to:

identify a control channel of the frequency resource,

contend, at the control channel, for resources on a data channel of the frequency resource, wherein the contention for the resources comprises transmission of a data-transmission request to the receiving wireless device, and wherein the data-transmission request comprises transmission start time of data transmission, and

when the contention for the resources is successful, transmit data to the receiving wireless device on the data channel of the frequency resource, wherein the control channel and the data channel operate on separate frequencies of the frequency resource.

12. The transmitting wireless device according to claim 11 , wherein the identification of the control channel comprises receipt of signalling, from the wireless network, indicating which frequency or frequencies the control channel operates on.

13. The transmitting wireless device according to claim 11 , wherein when the contention for the resources is unsuccessful, the memory further comprising instructions, which when executed by the processor cause the transmitting wireless device to back-off from the contention for the resources on the data channel for a period of time until there is a new contention, at the control channel, for the resources on the data channel of the frequency resource.

14. The transmitting wireless device according to claim 13 , wherein the period of time is dependent on a priority of the transmitting wireless device.

15. The transmitting wireless device according to claim 11 , wherein the data-transmission request further comprises at least one of the following:

identity of the transmitting wireless device,

identity of the receiving wireless device, and

duration in time of the data transmission.

16. The transmitting wireless device according to claim 11 , wherein the data-transmission request further comprises an indication of a portion of the data channel.

17. A receiving wireless device adapted for receiving a transmission from a transmitting wireless device, both wireless devices operating in a wireless network applying a contention-based medium access control protocol, the wireless network operating on a frequency resource, the receiving wireless device comprising a processor and memory, the memory comprising instructions which when executed by the processor cause the receiving wireless device to:

identify a control channel of the frequency resource,

receive, from the transmitting wireless device, on the identified control channel, a request for performing a transmission to the receiving wireless device on a data channel of the frequency resource,

receive a reservation confirmation from a third wireless device, wherein the received reservation confirmation comprises information pertaining to a reservation of at least a portion of the data channel for a period of time,

determine that no other conflicting reservation of the data channel of the frequency resource[U] has been performed, wherein the determination is based at least partly on the received reservation confirmation from the third wireless device, and

transmit, based on the determination, another reservation confirmation to at least the transmitting wireless device.

18. The receiving wireless device according to claim 17 , wherein the identification of the control channel comprises receipt of signalling, from the wireless network, indicating which frequency or frequencies the control channel operates on.

19. The receiving wireless device according to claim 17 , wherein the received request comprises at least one of the following:

identity of the transmitting wireless device,

identity of the receiving wireless device,

transmission start time of data transmission, and

duration of the data transmission.

20. The receiving wireless device according to claim 17 , wherein the received request comprises an indication of a portion of the data channel.

21. A transmitting wireless device for performing a transmission to a receiving wireless device both wireless devices operating in a wireless network applying a contention-based medium access control protocol, the wireless network operating on a frequency resource, the transmitting wireless device comprising:

at least one processor configured to:

identify a control channel of the frequency resource, and

contend, at the control channel, for resources on a data channel of the frequency resource, wherein the contention for the resources comprises transmission of a data-transmission request to the receiving wireless device, and wherein the data-transmission request comprises transmission start time of data transmission, and

a transmitter configured to, when the contention for the resources is successful, transmit data to the receiving wireless device on the data channel of the frequency resource, wherein the control channel and the data channel operate on separate frequencies of the frequency resource.

22. A receiving wireless device for receiving a transmission from a transmitting wireless device both wireless devices operating in a wireless network applying a contention-based medium access control protocol, the wireless network operating on a frequency resource, the receiving wireless device comprising:

at least one processor configured to:

identify a control channel of the frequency resource,

a receiver configured to:

receive, from the transmitting wireless device, on the identified control channel, a request for performing a transmission to the receiving wireless device on the data channel of the frequency resource, and

receive a reservation confirmation from a third wireless device, wherein the received reservation confirmation comprises information pertaining to a reservation of at least a portion of the data channel for a period of time,

wherein the at least one processor is configured to determine that no other conflicting reservation of the data channel of the frequency resource has been performed, and wherein the determination is based at least partly on the received reservation confirmation from the third wireless device, and

a transmitter configured to transmit, based on the determination, another reservation confirmation to at least the transmitting wireless device.