User equipment and method for small data transmission

Patent metadata

Field	Value
Publication number	US-2021410180-A1
Application number	US-202117356832-A
Country	US
Kind code	A1
Filing date	Jun 24, 2021
Priority date	Jun 24, 2020
Publication date	Dec 30, 2021
Grant date	—

Abstract

A user equipment (UE) and a method for small data transmission (SDT) are provided. The method includes receiving a Radio Resource Control (RRC) release message from a Base Station (BS), the RRC release message indicating an SDT configuration including a Configured Grant (CG) configuration and a timer; initiating a transmission on an Uplink (UL) resource while the UE is in an RRC_INACTIVE state, the UL resource being either configured by the CG configuration or scheduled by a UL grant from the BS; starting or restarting the timer after initiating the transmission; and monitoring a Physical Downlink Control Channel (PDCCH) addressed to a specific Radio Network Temporary Identifier (RNTI) on a specific search space while the timer is running.

First claim

What is claimed is:

1 . A method performed by a User Equipment (UE) for small data transmission (SDT), the method comprising:
receiving a Radio Resource Control (RRC) release message from a Base Station (BS), the RRC release message indicating an SDT configuration including a Configured Grant (CG) configuration and a timer; initiating a transmission on an Uplink (UL) resource while the UE is in an RRC_INACTIVE state, the UL resource being either configured by the CG configuration or scheduled by a UL grant from the BS; starting or restarting the timer after initiating the transmission; and monitoring a Physical Downlink Control Channel (PDCCH) addressed to a specific Radio Network Temporary Identifier (RNTI) on a specific search space while the timer is running.

2 . The method of claim 1 , further comprising:
stopping the timer upon receiving an indication from the BS.

3 . The method of claim 2 , wherein the indication indicates Downlink Feedback Information (DFI).

4 . The method of claim 2 , wherein the indication indicates a specific UL grant for a new transmission associated with a Hybrid Automatic Repeat Request (HARM) process used for the transmission.

5 . The method of claim 1 , further comprising:
stopping the timer when a Time Alignment (TA) timer expires.

6 . The method of claim 1 , further comprising:
stopping the timer when the CG configuration is released.

7 . The method of claim 1 , further comprising:
initiating a Random Access (RA) procedure when the timer expires.

8 . The method of claim 1 , wherein the specific search space is indicated by the SDT configuration.

9 . The method of claim 1 , wherein the specific RNTI includes at least one of a Cell-RNTI (C-RNTI) and a Configured Scheduling-RNTI (CS-RNTI).

10 . The method of claim 1 , wherein the timer is included in the CG configuration.

11 . A user equipment (UE) for small data transmission (SDT), the UE comprising:
one or more processors; and at least one memory coupled to at least one of the one or more processors, wherein the at least one memory stores a computer-executable program that, when executed by the at least one of the one or more processors, causes the UE to:
receive a Radio Resource Control (RRC) release message from a Base Station (BS), the RRC release message indicating an SDT configuration including a Configured Grant (CG) configuration and a timer;
initiate a transmission on an Uplink (UL) resource while the UE is in an RRC_INACTIVE state, the UL resource being either configured by the CG configuration or scheduled by a UL grant from the BS;
start or restart the timer after initiating the transmission; and
monitor a Physical Downlink Control Channel (PDCCH) addressed to a specific Radio Network Temporary Identifier (RNTI) on a specific search space while the timer is running.

12 . The UE of claim 11 , wherein the computer-executable program, when executed by the processor, further causes the UE to:
stop the timer upon receiving an indication from the BS.

13 . The UE of claim 12 , wherein the indication indicates Downlink Feedback Information (DFI).

14 . The UE of claim 12 , wherein the indication indicates a specific UL grant for a new transmission associated with a Hybrid Automatic Repeat Request (HARQ) process used for the transmission.

15 . The UE of claim 11 , wherein the computer-executable program, when executed by the processor, further causes the UE to:
stop the timer when a Time Alignment (TA) timer expires.

16 . The UE of claim 11 , wherein the computer-executable program, when executed by the processor, further causes the UE to:
stop the timer when the CG configuration is released.

17 . The UE of claim 11 , wherein the computer-executable program, when executed by the processor, further causes the UE to:
initiate a Random Access (RA) procedure when the timer expires.

18 . The UE of claim 11 , wherein the specific search space is indicated by the SDT configuration.

19 . The UE of claim 11 , wherein the specific RNTI includes at least one of a Cell-RNTI (C-RNTI) and a Configured Scheduling-RNTI (CS-RNTI).

20 . The UE of claim 11 , wherein the timer is included in the CG configuration.

Assignees

• Fg innovation co ltd

Inventors

• Tsai Hsin-Hsi
• Chin Heng-Li

Classifications

• H04W72/23 Primary

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

• H04W72/1268 Primary

  of uplink data flows · CPC title

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title

• H04W76/27

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

• H04L1/1883

  using multiple timers · CPC title