Methods and apparatus for utilizing short transmission time intervals in a wireless communications network
A terminal device for a wireless communication network is configurable with a plurality of transmission time intervals. An example method comprises: receiving a grant message comprising an indication of radio resources in which the terminal device can transmit one or more wireless messages, the radio resources being configured according to a first transmission time interval of the plurality of transmission time intervals; determining the presence of data to transmit, the data being associated with a logical channel; determining a maximum transmission time interval associated with the logical channel; and, responsive to a determination that the maximum transmission time interval associated with the logical channel is less than the first transmission time interval, transmitting a scheduling request message. The scheduling request message is configured according to a second transmission time interval of the plurality of transmission time intervals, shorter than the first.
1 . A method in a terminal device for a wireless communication network, the method comprising:
determining that a transmission time interval granted for a transmission associated with a first logical channel is greater than a maximum transmission time interval associated with the first logical channel; and,
responsive to said determining, transmitting a scheduling request message configured according to a transmission time interval that is shorter than the transmission time interval granted for the transmission.
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 transmission time interval granted for the transmission 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 transmission time interval granted for the transmission; and
transmitting data using the second radio resources.
4 . The method of claim 3 , wherein the second radio resources are configured according to the transmission time interval that is shorter than the transmission time interval granted for the transmission.
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 transmission time interval granted for the transmission, 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 granted for the transmission, 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 transmission time interval granted for a transmission associated with a first logical channel is greater than a maximum transmission time interval associated with the first logical channel; and,
responsive to said determining, transmit a scheduling request message configured according to a transmission time interval that is shorter than the transmission time interval granted for the transmission.
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 transmission time interval granted for the transmission 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 transmission time interval granted for the transmission; and
transmitting data using the second radio resources.
17 . The terminal device of claim 16 , wherein the second radio resources are configured according to the transmission time interval that is shorter than the transmission time interval granted for the transmission.
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.