Methods and apparatus for utilizing short transmission time intervals in a wireless communications network

1. A method in a terminal device for a wireless communication network, the method comprising:

determining that a maximum transmission time interval associated with a first logical channel is less than a first transmission time interval of a plurality of transmission time intervals; and

responsive to said determining, transmitting a scheduling request message being configured according to a second transmission time interval of the plurality of transmission time intervals, wherein the second transmission time interval is shorter than the first transmission time interval.

2. The method of claim 1 , further comprising receiving a first grant message from the wireless network, prior to said determining, the first grant message indicating first radio resources, wherein the first transmission time interval is associated with the first radio resources.

3. The method of claim 1 , further comprising:

receiving a second grant message from the wireless communication network, subsequent to said transmitting, the second grant message indicating second radio resources on which the terminal device can transmit one or more wireless messages, the second radio resources being configured according to a transmission time interval shorter than the first transmission time interval; and

transmitting data using the second radio resources.

4. The method of claim 3 , wherein the second radio resources are configured according to the second transmission time interval.

5. The method of claim 1 , wherein the scheduling request message is transmitted via a control channel.

6. The method of claim 5 , wherein the control channel is a short control channel.

7. The method of claim 5 , wherein the control channel is an uplink control channel.

8. The method of claim 1 , further comprising:

responsive to a determination that the maximum transmission time interval associated with the first logical channel is less than the first transmission time interval, not transmitting a buffer status report for data associated with the first logical channel using the first radio resources.

9. The method of claim 1 , further comprising:

responsive to a determination that the maximum transmission time interval associated with the first logical channel is less than the first transmission time interval, transmitting a buffer status report for the data associated with the first logical channel using the first radio resources.

10. The method of claim 1 , wherein the first radio resources comprise one or more of: one or more transmission frequencies, one or more transmission time slots, and one or more orthogonal codes for encoding.

11. The method of claim 1 , wherein the first radio resources comprise radio resources for the transmission of one or more sidelink messages to another terminal device.

12. The method of claim 1 , wherein an association between logical channels and maximum transmission time intervals is pre-configured via radio resource control signaling from the wireless communications network.

13. The method of claim 1 , wherein the first logical channel relates to critical machine-type communications or ultra-reliable low-latency communications.

14. A terminal device for a wireless communication network, the terminal device comprising processing circuitry and a non-transitory computer-readable medium storing instructions that, when executed by the processing circuitry, cause the terminal device to:

determine that a maximum transmission time interval associated with a first logical channel is less than a first transmission time interval of a plurality of transmission time intervals; and

responsive to said determining, transmit a scheduling request message being configured according to a second transmission time interval of the plurality of transmission time intervals, wherein the second transmission time interval is shorter than the first transmission time interval.

15. The terminal device of claim 14 , wherein the non-transitory computer-readable medium further stores instructions which, when executed by the processing circuitry, cause the terminal device to receive a first grant message from the wireless network, prior to said determining, the first grant message indicating first radio resources, wherein the first transmission time interval is associated with the first radio resources.

16. The terminal device of claim 14 , wherein the non-transitory computer-readable medium further stores instructions which, when executed by the processing circuitry, cause the terminal device to:

receive a second grant message from the wireless communication network, subsequently to transmitting the scheduling request, the second grant message indicating second radio resources on which the terminal device can transmit one or more wireless messages, the second radio resources being configured according to a transmission time interval shorter than the first transmission time interval; and

transmit data using the second radio resources.

17. The terminal device of claim 16 , wherein the second radio resources are configured according to the second transmission time interval.

18. The terminal device of claim 14 , wherein the non-transitory computer-readable medium stores instructions which, when executed by the processing circuitry, cause the terminal device to transmit the scheduling request message via a short control channel.

19. The terminal device of claim 14 , wherein the first radio resources comprise radio resources for the transmission of one or more sidelink messages to another terminal device.