Urllc dai and lti

Patent metadata

Field	Value
Publication number	US-2025158759-A1
Application number	US-202519021248-A
Country	US
Kind code	A1
Filing date	Jan 15, 2025
Priority date	Sep 27, 2018
Publication date	May 15, 2025
Grant date	—

Abstract

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.

First claim

1 . A wireless communication system, comprising
one or more base stations, and one or more user devices, UEs, wherein the one or more base stations are configured to transmit data to a UE being served by the one or more base stations, 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 data associated with second service, the first and second services comprising one or more different transmission requirements, wherein, responsive to receiving in the control data a grant for a feedback transmission, the UE is configured to send a feedback to the one or more base stations, 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 data, and a second DAI associated with the second data.

2 . The wireless communication system of claim 1 , wherein the user data comprises third data, the third user data associated with a third service, and the control data comprises a third DAI associated with the third data.

3 . The wireless communication system of claim 1 , wherein the user data comprises third data, the third user data associated with a third service, and wherein the first DAI is associated with the first and third data, or the second DAI is associated with the second and third data.

4 . The wireless communication system 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 wireless communication system 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 wireless communication system of claim 1 , wherein the first and second DAIs are incremented independently, the first DAI being incremented responsive to sending first data to the UE, and the second DAI being incremented responsive to sending second data to the UE.

7 . The wireless communication system of claim 1 , wherein the first and second transmission parameters comprise one or more of latency, reliability, packet size, QoS, service type.

8 . The wireless communication system 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 wireless communication system 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 wireless communication system 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 wireless communication system 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 wireless communication system 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 wireless communication system 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 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 wireless communication system 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 wireless communication system 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 wireless communication system 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 . A 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, wherein, responsive to receiving a grant for a feedback transmission in the control data, 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, and wherein the control data comprises a last transmission indicator, LTI, the LTI indicating a time since the last transmission of the first and/or second data by the base station.

18 . The wireless communication system of claim 17 , wherein the UE is configured to determine the time of the last transmission of data by the base station using the LTI, and to send the feedback in case the time since the last the last transmission of data by the base station is below a predefined threshold.

19 . The wireless communication system of claim 17 , wh

Assignees

• Fraunhofer Ges Forschung

Inventors

• Fehrenbach Thomas
• Hellge Cornelius
• Göktepe Baris
• Wirth Thomas
• Schierl Thomas

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/1263

  Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows · CPC title

• H04L1/0038

  Blind format detection (for detection of modulation format H04L27/0012) · CPC title

• H04L1/003

  Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits · CPC title

• H04L1/1896 Primary

  ARQ related signaling · CPC title