URLLC DAI and LTI
A wireless communication system includes one or more base stations, and one or more user devices, UEs. The base station is configured to transmit data to a UE being served by the base station, the data including control data and user data, the user data including at least first user data and second user data, the first user data associated with a first service and second data associated with second service, the first and second services having one or more different transmission requirements. Responsive to receiving in the control data a grant for a feedback transmission, the UE is configured to send a feedback to the base station, the feedback indicating for one or more data blocks of the data a successful or non-successful reception at the UE. The control data includes a first downlink assignment index, DAI, associated with the first data, and a second DAI associated with the second data.
1. A user device (UE) for a wireless communication system, the wireless communication system comprising
one or more base stations, and
one or more user devices (UEs), wherein the UE is configured to:
receive data from a base station serving the UE, the data comprising control data and user data, the user data comprising at least first user data and second user data, the first user data associated with a first service and the second data associated with a second service, the first and second services comprising one or more different transmission requirements,
responsive to receiving in the control data a grant for a feedback transmission, send a feedback to the base station, the feedback indicating for one or more data blocks of the data a successful or non-successful reception at the UE, and
wherein the control data comprises a first downlink assignment index, DAI, associated with the first user data, and a second DAI associated with the second user data.
2. The user device (UE) of claim 1 , wherein the user data further comprises third user data, the third user data associated with a third service, and the control data comprises a third DAI associated with the third user data.
3. The user device (UE) of claim 1 , wherein the user data further comprises third user data, the third user data associated with a third service, and wherein the first DAI is associated with the first and third user data, or the second DAI is associated with the second and third user data.
4. The user device (UE) of claim 1 , wherein the control data points to data and a feedback resource mapping for sending the feedback is
explicit, or
implicit, or
semi-statically preconfigured.
5. The user device (UE) of claim 1 , wherein the UE is configured to monitor a plurality of control regions in a received signal for the control data, wherein a control region indicates the transmission of one or more data blocks of user data.
6. The user device (UE) of claim 1 , wherein the first and second DAIs are incremented independently, the first DAI being incremented responsive to sending first user data to the UE, and the second DAI being incremented responsive to sending second user data to the UE.
7. The user device (UE) of claim 1 , wherein the first and second transmission parameters comprise one or more of latency, reliability, packet size, QoS, service type.
8. The user device (UE) of claim 1 , wherein the UE is configured to send the feedback for data associated with the first service during a first interval following the transmission of the user data, and the feedback for data associated with the second service during a second interval following the transmission of the user data, the second interval being shorter than the first interval.
9. The user device (UE) of claim 1 , wherein:
the first DAI comprises a counter value being incremented for each user data transmission associated with the first service for the UE, and a total value indicating the number of user data transmissions of the first services up to and comprising a current control region, and
the second DAI comprises a counter value being incremented for each transmission of data associated with the second service for the UE.
10. The user device (UE) of claim 1 , wherein
the first DAI comprises a counter value being incremented for each user data transmission associated with the first service for the UE, and a first total value indicating the number of user data transmissions of the first service up to and comprising a current control region, and
the second DAI comprises a counter value being incremented for each user data transmission associated with the second service for the UE, and a second total value indicating the number of user data transmissions of the second service up to and comprising a current control region.
11. The user device (UE) of claim 1 , wherein the control data in a control region comprises one or more first control messages associated with the first user data and one or more second control messages associated with the second user data, the first control message comprising the first DAI and the second control message comprising the second DAI.
12. The user device (UE) of claim 1 , wherein the control data in a control region comprises one or more control messages associated with the first user data and comprising the first DAI and the second DAI.
13. The user device (UE) of claim 1 , wherein:
the control data further comprises a last transmission indicator (LTI), the LTI indicating the time since a last transmission of the first and/or second user data by the base station, and
the UE is configured to determine the time of the last data transmission of data by the base station using the LTI, and to send the feedback in case the time since the last transmission of data by the base station is below a predefined threshold.
14. The user device (UE) of claim 13 , wherein the UE is configured to
use pre-configured UE-specific uplink resources for reporting the feedback,
detect, using the second DAI and/or the LTI, a missed transmission of data by the base station, and
send the feedback if a time for the uplink of the feedback using the UE-specific uplink resources has not passed at the time of detecting the missed transmission.
15. The user device (UE) of claim 13 , wherein, responsive to detecting a missed transmission of user data and in case a time passed since a last transmission as indicated by the LTI is below a predefined threshold, the UE is configured to blind decode the missed transmission using one or more previous parameters, e.g., using the same frequency resources and MCS level, using the same frequency resources and trying a different MCS level, or using the same MSC level and trying different frequency resources.
16. The user device (UE) of claim 13 , wherein, responsive to detecting a missed transmission of control data and in case a time passed since a last transmission as indicated by the LTI is below a predefined threshold, the UE is configured to perform a transmission of uplink data using one or more previous parameters, e.g., using the same frequency resources and MCS level, using the same frequency resources and trying a different MCS level, or using the same MSC level and trying different frequency resources.
17. The user device (UE) of claim 1 , wherein:
the UE comprises one or more of
a mobile terminal, or
stationary terminal, or
cellular IoT-UE, or
vehicular UE, or
an IoT or narrowband IoT, NB-IoT, device, or
a ground based vehicle, or
an aerial vehicle, or
a drone, or
a moving base station, or
road side unit, or
a building, or
any other item or device provided with network connectivity enabling the item/device to communicate using the wireless communication network, e.g., a sensor or actuator, and
the base station comprises one or more of
a macro cell base station, or
a small cell base station, or
a central unit of a base station, or
a distributed unit of a base station, or
a road side unit, or
a UE, or
a remote radio head, or
an AMF, or
an SMF, or
a core network entity, or
mobile edge computing entity, or
a network slice as in the NR or 5G core context, or
any transmission/reception point, TRP, enabling an item or a device to communicate using the wireless communication network, the item or device being provided with network connectivity to communicate using the wireless communication network.
18. A base station for a wireless communication system, the wireless communication system comprising one or more base stations and one or more user devices (UEs), wherein the base station is configured to:
transmit data to a UE being served by the base station, the data comprising control data and user data, the user data comprising at least first user data and second user data, the first user data associated with a first service and second user data associated with a second service, the first and second services comprising one or more different transmission requirements, and
receive from the UE a feedback, the feedback indicating for one or more data blocks of the data a successful or non-successful reception at the UE,
wherein the control data comprises a first downlink assignment index, DAI, associated with the first user data, and a second DAI associated with the second user data.
19. A method for operating a user device (UE) of a wireless communication system, the wireless communication system comprising one or more base stations and the UE being served by a base station, the method comprising:
receiving, by the user device (UE), data, the data comprising control data and user data, the user data comprising at least first user data and second user data, the first user data associated with a first service and second user data associated with a second service, the first and second services comprising one or more different transmission requirements, and
responsive to receiving in the control data a grant for a feedback transmission, sending, by the UE, a feedback to the base station, the feedback indicating for one or more data blocks of the data a successful or non-successful reception at the UE,
wherein the control data comprises a first downlink assignment index, DAI, associated with the first user data, and a second DAI associated with the second user data.