# US 12,193,073 B2 · Method and apparatus for small data transmission in a wireless communication system

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- Number: US 12,193,073 B2
- Document ID: US12193073B2
- Status: Granted
- Kind: B2
- Application number: 17/808,284
- Filed: 2022-06-22
- Published: 2022-12-22
- Granted: 2025-01-07
- Earliest claimed: 2021-06-22
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Anil Agiwal; Hyunjeong Kang; Sangbum Kim
- Web page: https://patentgrep.com/patent/US12193073B2

## CPC

- H04W 74/0841: {with collision treatment}
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04W 56/001: {Synchronization between nodes}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 74/0866: {using a dedicated channel for access}
- H04W 76/20: Manipulation of established connections
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 74/0836: with 2-step access
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. According to an embodiment, the method comprises initiating a small data transmission (SDT) procedure, in a radio resource control (RRC) inactive state, obtaining a report for a log connection failure or an SDT procedure failure, based on an expiry of an SDT timer, wherein the report for the log connection failure includes information indicating that the report is for SDT and in case that the UE enters an RRC connected state, and transmitting the report to a base station, based on a request for the report from the base station.

## Claims

### Claim 1

A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
initiating a small data transmission (SDT) procedure, in a radio resource control (RRC) inactive state;
obtaining a report for a log connection failure or an SDT procedure failure, based on an expiry of an SDT timer, wherein the report for the log connection failure includes information indicating that the report is for SDT; and
in case that the UE enters an RRC connected state, transmitting the report to a base station, based on a request for the report from the base station.

### Claim 2 (depends on 1)

The method of claim 1, wherein the report includes information indicating a number of SDT failure, and the number of the SDT failure is increased, based on expiry of the SDT timer.

### Claim 3 (depends on 1)

The method of claim 1, wherein the report includes measured reference signal received power (RSRP) of downlink (DL) path loss at a time of initiating the SDT procedure.

### Claim 4 (depends on 1)

The method of claim 1, further comprising:
setting a measurement result in the report to include reference signal received power (RSRP), reference signal receive quality (RSRQ) and Synchronization Signal Physical Broadcast Channel (SS/PBCH) block (SSB) indexes of failed cell based on available SSB measurements collected up to a time at the UE detected SDT procedure failure.

### Claim 5 (depends on 1)

The method of claim 1, further comprising performing an integrity check on data of the SDT procedure, while the SDT timer is running,
wherein the obtaining of the report comprises:
in case that a failure of the integrity check occurs, obtaining the report for the log connection failure or the SDT procedure failure.

### Claim 6 (depends on 1)

The method of claim 1, wherein in case that a random access (RA) procedure is initiated for the SDT procedure and the random access procedure is successfully completed, setting an RA purpose in an RA report to indicate the SDT and setting information of down link reference signal received power (RSRP) above a threshold SDT selection for an RA attempt to indicate whether an RSRP of a Synchronization Signal/Physical Broadcast Channel (SS/PBCH) block corresponding to a random access attempt is above a threshold configured for the SDT.

### Claim 7 (depends on 6)

The method of claim 6, wherein the RA report includes measured RSRP of downlink pathloss at a time of initiating the SDT procedure.

### Claim 8 (depends on 6)

The method of claim 6, wherein the RA report includes information to indicate whether a first preamble group or a second preamble group is used on the RA procedure.

### Claim 9

A user equipment (UE) in a wireless communication system, the UE comprising:
a transceiver; and
a processor coupled with the transceiver and configured to:
initiate a small data transmission (SDT) procedure, in a radio resource control (RRC) inactive state,
obtain a report for a log connection failure or an SDT procedure failure, based on an expiry of an SDT timer, wherein the report for the log connection failure includes information indicating that the report is for SDT, and
in case that the UE enters an RRC connected state, transmit the report to a base station, based on a request for the report from the base station.

### Claim 10 (depends on 9)

The UE of claim 9, wherein the report includes information indicating a number of SDT failure, and the number of the SDT failure is increased, based on expiry of the SDT timer.

### Claim 11 (depends on 9)

The UE of claim 9, wherein the report includes measured reference signal received power (RSRP) of downlink (DL) path loss at a time of initiating the SDT procedure.

### Claim 12 (depends on 9)

The UE of claim 9, wherein the processor is further configured to:
set a measurement result in the report to include reference signal received power (RSRP), reference signal receive quality (RSRQ) and Synchronization Signal/Physical Broadcast Channel (SS/PBCH) block (SSB) indexes of failed cell based on available SSB measurements collected up to a time at the UE detected SDT procedure failure.

### Claim 13 (depends on 9)

The UE of claim 9, wherein the processor is further configured to:
perform an integrity check on data of the SDT procedure, while the SDT timer is running, and
in case that a failure of the integrity check occurs, obtain the report for the log connection failure or the SDT procedure failure.

### Claim 14 (depends on 9)

The UE of claim 9, wherein the processor is further configured to:
in case that a random access (RA) procedure is initiated for the SDT procedure and the random access procedure is successfully completed, set an RA purpose in an RA report to indicate the SDT and set information of down link reference signal received power (RSRP) above a threshold SDT selection for an RA attempt to indicate whether an RSRP of a Synchronization Signal/Physical Broadcast Channel (SS/PBCH) block corresponding to a random access attempt is above a threshold configured for the SDT.

### Claim 15 (depends on 9)

The UE of claim 9, wherein the RA report includes measured RSRP of downlink pathloss at a time of initiating the SDT procedure.

### Claim 16 (depends on 9)

The UE of claim 9, wherein the RA report includes information to indicate whether a first preamble group or a second preamble group is used on the RA procedure.