Methods and apparatus for inactive state initial uplink transmission using pre-configured grant at a base station in wireless communication

Patent metadata

Field	Value
Publication number	US-12557167-B2
Application number	US-202017598243-A
Country	US
Kind code	B2
Filing date	Sep 28, 2020
Priority date	Sep 28, 2020
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

A base station (BS) comprising a processor configured to perform operations is described. In an exemplary embodiment, the operations include generating one or more pre-configured grant (pre-CG) configurations. The operations also include transmitting the one or more pre-CG configurations to a user equipment (UE) to enable the UE to perform an initial transmission while the UE is in an RRC_INACTIVE state using a pre-CG resource based on the transmitted one or more pre-CG configurations. Each of the one or more pre-CG configurations includes a configuration of the pre-CG resource and one or more conditions to use the pre-CG resource. The one or more conditions to use the pre-CG resource include one or more of an access type, a transmission priority, a mapped Logical Channel (LCH)/Dedicated Radio Bearer (DRB)/Quality of Service (QOS) flow, and a valid timing advance (TA).

First claim

What is claimed is:

1 . A base station (BS) comprising a processor configured to perform operations comprising:
generating one or more pre-configured grant (pre-CG) configurations; transmitting the one or more pre-CG configurations and a list of cells for which the one or more pre-CG configurations are valid in a dedicated radio resource control (RRC) message to a user equipment (UE) to enable the UE to perform an initial data transmission while the UE is in an RRC_INACTIVE state using a pre-CG resource based on the transmitted one or more pre-CG configurations and the dedicated RRC message includes one or more conditions to use the pre-CG resource, wherein the one or more conditions comprise a current camping cell of the UE being included in the list of cells; receiving an inactive radio network temporary identifier (I-RNTI) of the UE for the initial data transmission according to the one or more pre-CG configurations and the current camping cell of the UE being associated with the BS; and transmitting a network feedback within a predefined time window after the initial data transmission using the pre-CG resource, wherein the network feedback comprises an uplink grant based on the I-RNTI of the UE.

2 . The BS of claim 1 , wherein each of the one or more pre-CG configurations comprises a configuration of the pre-CG resource and one or more conditions to use the pre-CG resource.

3 . The BS of claim 2 , wherein the one or more conditions to use the pre-CG resource comprise one or more of an access type, a transmission priority, a mapped Logical Channel (LCH), Dedicated Radio Bearer (DRB), or Quality of Service (QOS) flow, and a valid timing advance (TA).

4 . The BS of claim 1 , wherein the processor is further configured to perform operations comprising:
transmitting a dedicated RRC message comprising the one or more pre-CG configurations for the RRC_INACTIVE state; and configuring the UE to enter RRC_INACTIVE state.

5 . The BS of claim 4 , wherein the processor is further configured to perform operations comprising:
transmitting a broadcast message comprising an indication if a cell sending the broadcast message supports the initial data transmission using the pre-CG resource.

6 . The BS of claim 1 , wherein, to transmit the one or more pre-CG configurations, the processor is further configured to perform operations comprising:
configuring the UE to enter the RRC_INACTIVE state.

7 . The BS of claim 1 , wherein, to transmit the one or more pre-CG configurations, the processor is further configured to perform operations comprising:
configuring the UE to enter the RRC_INACTIVE state; transmitting a System Information Block (SIB) comprising the one or more pre-CG configurations for the RRC_INACTIVE state; and receiving the initial data transmission using the pre-CG resource.

8 . The BS of claim 1 , wherein the processor is further configured to perform operations comprising:
receiving a UE identifier (ID) comprising the I-RNTI in a MAC Protocol Data Unit (PDU) for the initial data transmission.

9 . The BS of claim 8 , wherein a CG configuration of the one or more pre-CG configurations comprises a CG-RNTI, the transmitted network feedback comprising a downlink MAC PDU including the UE ID, which is scheduled using the CG-RNTI of the CG configuration used for the initial data transmission.

10 . The BS of claim 1 , wherein the processor is further configured to perform operations comprising:
transmitting a downlink control information (DCI) for the uplink grant or downlink assignment with a corresponding CG-RNTI, or for uplink grant assignment with the I-RNTI of the UE.

11 . A method comprising:
generating, at a base station, one or more pre-configured grant (pre-CG) configurations; transmitting the one or more pre-CG configurations and a list of cells for which the one or more pre-CG configurations are valid in a dedicated radio resource control (RRC) message to a user equipment (UE) to enable the UE to perform an initial data transmission while the UE is in an RRC_INACTIVE state using a pre-CG resource based on the transmitted one or more pre-CG configurations and the dedicated RRC message includes one or more conditions to use the pre-CG resource, wherein the one or more conditions comprise a current camping cell of the UE being included in the list of cells; receiving an inactive radio network temporary identifier (I-RNTI) of the UE for the initial data transmission according to the one or more pre-CG configurations and the current camping cell of the UE being associated with the base station; and transmitting a network feedback within a predefined time window after the initial data transmission using the pre-CG resource, wherein the network feedback comprises an uplink grant based on the I-RNTI of the UE.

12 . The method of claim 11 , wherein each of the one or more pre-CG configurations comprises a configuration of the pre-CG resource and one or more conditions to use the pre-CG resource.

13 . The method of claim 12 , wherein the one or more conditions to use the pre-CG resource comprise one or more of an access type, a transmission priority, a mapped Logical Channel (LCH), Dedicated Radio Bearer (DRB), or Quality of Service (QOS) flow, and a valid timing advance (TA).

14 . The method of claim 11 , further comprising:
transmitting a dedicated RRC message comprising the one or more pre-CG configurations for the RRC_INACTIVE state; and configuring the UE to enter RRC_INACTIVE state.

15 . The method of claim 11 , wherein transmitting the one or more pre-CG configurations further comprises:
configuring the UE to enter the RRC_INACTIVE state.

16 . The method of claim 11 , wherein transmitting the one or more pre-CG configurations comprising further comprises:
configuring the UE to enter the RRC_INACTIVE state; transmitting a System Information Block (SIB) comprising the one or more pre-CG configurations for the RRC_INACTIVE state; and receiving the initial data transmission using the pre-CG resource.

17 . The method of claim 11 , further comprising:
receiving a UE identifier (ID) comprising the I-RNTI in a MAC Protocol Data Unit (PDU) for the initial data transmission; and transmitting a network feedback within a predefined time window after the initial data transmission using the pre-CG resource.

18 . The method of claim 11 , further comprising:
transmitting a downlink control information (DCI) for the uplink grant or downlink assignment with a corresponding CG-RNTI, or for uplink grant assignment with the I-RNTI of the UE.

Assignees

• Apple Inc

Inventors

• Yao Chunhai
• Zhang Dawei
• Xu Fangli
• Hu Haijing
• Shikari Murtaza A
• Vangala Sarma V
• Nimmala Srinivasan

Classifications

• H04W72/23

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

• Y02D30/70

  in wireless communication networks · CPC title

• H04W76/27 Primary

  Transitions between radio resource control [RRC] states · CPC title