# US 12,193,097 B2 · Terminal apparatus, base station apparatus, and method

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- Number: US 12,193,097 B2
- Document ID: US12193097B2
- Status: Granted
- Kind: B2
- Application number: 17/626,591
- Filed: 2020-07-17
- Published: 2022-12-01
- Granted: 2025-01-07
- Earliest claimed: 2019-07-17
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: Takako Hori; Hidekazu Tsuboi; Shohei Yamada
- Web page: https://patentgrep.com/patent/US12193097B2

## CPC

- H04W 76/20: Manipulation of established connections
- H04W 76/22: Manipulation of transport tunnels
- H04W 36/0061: {of neighbour cell information}
- H04W 36/185: {using make before break}
- H04W 36/08: Reselecting an access point
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A terminal apparatus includes a receiver configured to receive, from the base station apparatus, an RRC reconfiguration message including a DRB configuration, and a processing unit, wherein the processing unit performs, based on inclusion of a first parameter in the DRB configuration, configuration of a PDCP entity of a DRB corresponding to the DRB configuration, the configuration being related to a DAPS handover.

## Claims

### Claim 1

A terminal apparatus that communicates with a base station apparatus, the terminal apparatus comprising:
a receiver configured to receive an RRC (Radio Resource Control) reconfiguration message including a first DRB (Data Radio Bearer) configuration and a second DRB configuration from the base station apparatus; and
a processor, wherein
the processor is configured to:
not configure a first configuration to a first PDCP (Packet Data Convergence Protocol) entity of a first DRB corresponding to the first DRB configuration in a case that a first parameter is not included in the first DRB configuration; and
configure the first configuration to a second PDCP entity of a second DRB corresponding to the second DRB configuration in a case that the first parameter is included in the second DRB configuration, and
the first configuration is a configuration for a handover in which transmission and/or reception of user data in the target cell with continued transmission and/or reception of user data in the source cell.

### Claim 2 (depends on 1)

The terminal apparatus according to claim 1, wherein
the first parameter indicates that the handover in which transmission and/or reception of user data in the target cell with continued transmission and/or reception of user data in the source cell is applied to the DRB.

### Claim 3

A base station apparatus that communicates with a terminal apparatus, the base station apparatus comprising:
a transmitter configured to transmit an RRC (Radio Resource Control) reconfiguration message including a first DRB (Data Radio Bearer) configuration and a second DRB configuration to the terminal apparatus; and
a processor, wherein
the processor is configured to:
not configure a first configuration to a first PDCP (Packet Data Convergence Protocol) entity of a first DRB corresponding to the first DRB configuration in a case that a first parameter is not included in the first DRB configuration; and
configure the first configuration to a second PDCP entity of a second DRB corresponding to the second DRB configuration in a case that the first parameter is included in the second DRB configuration, and
the first configuration is a configuration for a handover in which transmission and/or reception of user data in the target cell with continued transmission and/or reception of user data in the source cell.

### Claim 4 (depends on 2)

The base station apparatus according to claim 2, wherein
the first parameter indicates that the handover in which transmission and/or reception of user data in the target cell with continued transmission and/or reception of user data in the source cell is applied to the DRB.

### Claim 5

A method for a terminal apparatus that communicates with a base station apparatus, the method comprising:
receiving an RRC (Radio Resource Control) reconfiguration message including a first DRB (Data Radio Bearer) configuration and a second DRB configuration from the base station apparatus;
not configuring a first configuration to a first PDCP (Packet Data Convergence Protocol) entity of a first DRB corresponding to the first DRB configuration in a case that a first parameter is not included in the first DRB configuration; and
configuring the first configuration to a second PDCP entity of a second DRB corresponding to the second DRB configuration in a case that the first parameter is included in the second DRB configuration, wherein
the first configuration is a configuration for a handover in which transmission and/or reception of user data in the target cell with continued transmission and/or reception of user data in the source cell.