# US 12,604,215 B2 · Method and system for UE actions upon SCG activation and deactivation

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- Number: US 12,604,215 B2
- Document ID: US12604215B2
- Status: Granted
- Kind: B2
- Application number: 18/654,732
- Filed: 2024-05-03
- Published: 2024-08-29
- Granted: 2026-04-14
- Earliest claimed: 2020-10-22
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Jajohn Mathew Mattam; Vinay Kumar Shrivastava; Fasil Abdul Latheef
- Web page: https://patentgrep.com/patent/US12604215B2

## CPC

- H04W 24/02: Arrangements for optimising operational condition
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04B 7/06964: {Re-selection of one or more beams after beam failure}
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0035: {Resource allocation in a cooperative multipoint environment}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04W 72/30: Resource management for broadcast services
- H04W 76/15: Setup of multiple wireless link connections
- H04W 76/19: Connection re-establishment
- H04W 76/25: Maintenance of established connections
- H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX]
- H04W 76/30: Connection release
- H04B 7/022: Site diversity; Macro-diversity (using two or more spaced independent antennas H04B7/04)
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L 5/0078: {Timing of allocation}
- H04L 5/0098: {Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands}
- H04W 24/08: Testing, {supervising or monitoring} using real traffic
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 76/34: Selective release of ongoing connections
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The disclosure provides a method for enabling user equipment (UE) actions upon secondary cell group (SCG) deactivation is provided.

## Claims

### Claim 1

A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a network, a radio resource control (RRC) reconfiguration message including configuration information indicating a deactivation of a secondary cell group (SCG) of the UE and a field for a beam failure detection (BFD) and a radio link monitoring (RLM) associated with the SCG of the UE;
performing a medium access control (MAC) reset based on the configuration information;
in case that the field is set to perform the BFD and the RLM, performing the BFD and the RLM on a primary SCG cell (PSCell) of the SCG of the UE when the SCG of the UE is deactivated; and
in case that the field is set to not perform the BFD and the RLM, stopping a timer T310 and a timer T312 when the SCG of the UE is deactivated.

### Claim 2 (depends on 1)

The method of claim 1,
wherein a sounding reference signal (SRS) on the PSCell is not transmitted, when the SCG of the UE is deactivated.

### Claim 3 (depends on 1)

The method of claim 1, further comprising:
identifying a radio link failure (RLF) to be detected for a master cell group (MCG) associated with the UE; and
in case that the SCG of the UE is deactivated, initiating an RRC connection re-establishment procedure.

### Claim 4 (depends on 1)

The method of claim 1, further comprising:
cancelling a triggered reporting procedure of at least one of a buffer status report (BSR) or a power headroom report (PHR), when the SCG of the UE is deactivated.

### Claim 5 (depends on 1)

The method of claim 1, further comprising:
in case that the SCG of the UE is deactivated, transmitting, a measurement report message to the network.

### Claim 6 (depends on 1)

The method of claim 1, further comprising:
in case that the SCG of the UE is deactivated, transmitting, a UE assistance information message to the network.

### Claim 7

A user equipment (UE) in a wireless communication system, the UE comprising:
a transceiver; and
at least one processor coupled with the transceiver and configured to:
receive, from a network, a radio resource control (RRC) reconfiguration message including configuration information indicating a deactivation of a secondary cell group (SCG) of the UE and a field for a beam failure detection (BFD) and a radio link monitoring (RLM) associated with the SCG of the UE,
perform a medium access control (MAC) reset based on the configuration information,
in case that the field is set to perform the BFD and the RLM, perform the BFD and the RLM on a primary SCG cell (PSCell) of the SCG of the UE when the SCG of the UE is deactivated, and
in case that the field is set to not perform the BFD and the RLM, stop a timer T310 and a timer T312 when the SCG of the UE is deactivated.

### Claim 8 (depends on 7)

The UE of claim 7,
wherein a sounding reference signal (SRS) on the PSCell is not transmitted, when the SCG of the UE is deactivated.

### Claim 9 (depends on 7)

The UE of claim 7 wherein the at least one processor is further configured to:
identify a radio link failure (RLF) to be detected for a master cell group (MCG) associated with the UE; and
in case that the SCG of the UE is deactivated, initiate an RRC connection re-establishment procedure.

### Claim 10 (depends on 7)

The UE of claim 7, wherein the at least one processor is further configured to:
cancel a triggered reporting procedure of at least one of a buffer status report (BSR) or a power headroom report (PHR), when the SCG of the UE is deactivated.

### Claim 11 (depends on 7)

The UE of claim 7, wherein the at least one processor is further configured to:
in case that the SCG of the UE is deactivated, transmit, a measurement report message to the network.

### Claim 12 (depends on 7)

The UE of claim 7, wherein the at least one processor is further configured to:
in case that the SCG of the UE is deactivated, transmit, a UE assistance information message to the network.