Two-stage trigger procedure

Inventor: Alexander Golitschek Edler von Elbwart (Hessen, DE)

Assignee: Panasonic Intellectual Property Corporation of America

H04W72/1268 H04W16/14 H04W72/0446 H04W72/1215 H04W72/23 H04W76/11

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Quick Facts

Patent No.: US 11,963,166
App. No.: 18/169,698
Granted: Apr 16, 2024
Kind: B2

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Abstract

The invention relates to a user equipment for being scheduled with uplink radio resources. The user equipment receives from a radio base station a first-stage uplink resource scheduling message, indicating uplink radio resources usable by the UE to perform an uplink transmission via an unlicensed cell. The receiver further receives a second-stage uplink resource scheduling message, which is related to the first-stage uplink resource scheduling message. Upon reception of the second-stage uplink resource scheduling message, a processor of the UE determines that an uplink transmission is scheduled in case the first-stage uplink resource scheduling message is valid. The first-stage uplink resource scheduling message is determined valid based on a determination as to whether an uplink transmission has been triggered by another second-stage uplink resource scheduling message within a predetermined time period prior to reception of the second-stage uplink resource scheduling message. The UE then performs an uplink transmission.

Claims (28)

1. A radio base station, comprising:

a transmitter, which, in operation, transmits to a user equipment a first-stage uplink resource scheduling message indicating uplink radio resources usable by the user equipment to perform an uplink transmission via an unlicensed cell, and a second-stage uplink resource scheduling message related to the first-stage uplink resource scheduling message,

wherein the first-stage uplink resource scheduling message is valid or not depending on whether the uplink transmission from the user equipment has been triggered or not by another second-stage uplink resource scheduling message within a predetermined time period prior to reception of the second-stage uplink resource scheduling message at the user equipment, and

a receiver, which, in operation, receives the uplink transmission from the user equipment via the unlicensed cell.

2. The radio base station according to claim 1 , wherein the first-stage uplink resource scheduling message is valid when no uplink transmission has been triggered by the other second-stage uplink resource scheduling message in the predetermined time period prior to reception of the second-stage uplink resource scheduling message at the user equipment.

3. The radio base station according to claim 1 , wherein the first-stage uplink resource scheduling message is invalid when the uplink transmission has been triggered by the other second-stage uplink resource scheduling message in the predetermined time period prior to reception of the second-stage uplink resource scheduling message, and

wherein the first-stage uplink resource scheduling message is valid when the first-stage uplink resource scheduling message has not been invalidated.

4. The radio base station according to claim 1 , wherein the first-stage uplink resource scheduling message is addressed to the user equipment, and the second-stage uplink resource scheduling message is commonly addressed to a plurality of user equipments including the user equipment.

5. The radio base station according to claim 1 , wherein the first-stage uplink resource scheduling message is addressed to the user equipment by means of a user-equipment-specific identity employed in the transmission of the first-stage uplink resource scheduling message.

6. The radio base station according to claim 5 , wherein the user-equipment-specific identify is configurable.

7. The radio base station according to claim 1 , wherein the second-stage uplink resource scheduling message is commonly addressed to a plurality of user equipments including the user equipment, by means of a shared identity employed in the transmission of the second-stage uplink resource scheduling message.

8. The radio base station according to claim 7 , wherein the shared identify is pre-configured.

9. The radio base station according to claim 1 , wherein the first-stage uplink resource scheduling message indicates the predetermined time period.

10. The radio base station according to claim 1 , wherein, during the predetermined time period, the first-stage uplink resource scheduling message is processed together with the second-stage uplink resource scheduling message at the user equipment.

11. The radio base station according to claim 1 , wherein the first-stage uplink resource scheduling message is processed together with the second-stage uplink resource scheduling message at the user equipment in case the second-stage uplink resource scheduling message is received within the predetermined time period after reception of the first-stage uplink resource scheduling message at the user equipment.

12. The radio base station according to claim 1 , wherein the first-stage uplink resource scheduling message indicates a first time offset to be considered for the uplink transmission.

13. The radio base station according to claim 12 , wherein the second-stage uplink resource scheduling message indicates a second time offset to be considered for the uplink transmission.

14. The radio base station according to claim 13 , wherein the receiver, in operation, receives the uplink transmission at least after a sum of the first time offset and the second time offset after reception of the second-stage uplink resource scheduling message at the user equipment.

15. The radio base station according to claim 1 , wherein the first-stage uplink resource scheduling message is a downlink control information (DCI) message of format 0A, 0B, 4A, or 4B, respectively comprising a first-stage flag indicating that the DCI message is a first uplink resource scheduling message of a two-stages uplink resource scheduling.

16. The radio base station according to claim 1 , wherein the second-stage uplink resource scheduling message is a downlink control information (DCI) message of format 1C, comprising a second-stage flag indicating that the DCI message is a second uplink resource scheduling message of a two-stages uplink resource scheduling.

17. A method implemented in a radio base station, the method comprising:

transmitting to a user equipment a first-stage uplink resource scheduling message indicating uplink radio resources usable by the user equipment to perform an uplink transmission via an unlicensed cell,

transmitting to the user equipment a second-stage uplink resource scheduling message, which is related to the first-stage uplink resource scheduling message,

receiving the uplink transmission from the user equipment via the unlicensed cell.

18. The method according to claim 17 , wherein the first-stage uplink resource scheduling message is valid when no uplink transmission has been triggered by the other second-stage uplink resource scheduling message in the predetermined time period prior to reception of the second-stage uplink resource scheduling message at the user equipment.

19. The method according to claim 17 , wherein the first-stage uplink resource scheduling message is invalid when the uplink transmission has been triggered by the other second-stage uplink resource scheduling message in the predetermined time period prior to reception of the second-stage uplink resource scheduling message.

20. The method according to claim 17 , wherein the first-stage uplink resource scheduling message indicates the predetermined time period.

Priority Claims (1)

EP 16002352 · Nov 4, 2016 · regional

Continuity (3)

Continuation 17357590 · Jun 24, 2021

Continuation 16346359

Related Publication 20230199762A1 · Jun 22, 2023