# US 12,004,263 B2 · Methods and apparatuses for transmitting and receiving data in wireless communication system

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- Number: US 12,004,263 B2
- Document ID: US12004263B2
- Status: Granted
- Kind: B2
- Application number: 17/810,623
- Filed: 2022-07-04
- Published: 2023-01-19
- Granted: 2024-06-04
- Earliest claimed: 2019-02-12
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Donggun Kim; Soenghun Kim; Suyoung Park
- Web page: https://patentgrep.com/patent/US12004263B2

## CPC

- H04L 69/04: Protocols for data compression, e.g. ROHC
- H04W 80/08: Upper layer protocols {(network arrangements or communication protocols for networked applications H04L67/00)}
- H04L 69/22: Parsing or analysis of headers
- H04W 28/06: Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)}
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 80/02: Data link layer protocols
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Provided is an operating method of a user equipment (UE) in a wireless communication system, the operating method including: receiving, from a base station, a radio resource control (RRC) message including packet data convergence protocol (PDCP) layer configuration information for each data radio bearer (DRB); and when a PDCP entity is configured to be reestablished for each DRB and the PDCP layer configuration information includes an indicator indicating to continuously use header compression protocol configuration information, indicating to a lower layer entity that the header compression protocol configuration information is configured to be continuously used.

## Claims

### Claim 1

A method performed by a user equipment (UE) in a wireless communication for performing handover between different radio access technologies, the method comprising:
receiving a radio resource control (RRC) message;
identifying whether a full configuration indicator is included in the RRC message;
in case that the full configuration indicator is not included in the RRC message, maintaining configuration information of a packet data convergence protocol (PDCP) layer or a service data adaptation protocol (SDAP) layer configured in a source base station (BS); and
based on the identification that the full configuration indicator is not included in the RRC message, using, for a target BS, the maintained configuration information of the PDCP layer or the SDAP layer configured in the source BS.

### Claim 2 (depends on 1)

The method of claim 1 further comprising:
in case that the full configuration indicator is included in the RRC message, releasing the configuration information of the PDCP layer or the SDAP layer configured in the source BS for all bearers.

### Claim 3 (depends on 1)

The method of claim 1 further comprising at least one of:
resetting media access control (MAC) layer;
stopping all timers that are running;
releasing configured security configuration information; or
releasing configuration information of a radio link control (RLC) layer or the MAC layer.

### Claim 4 (depends on 1)

The method of claim 1, wherein the RRC message comprises an RRC reconfiguration message or an RRC resume message.

### Claim 5 (depends on 1)

The method of claim 1 further comprising:
identifying successful completion of the handover between the different radio access technologies.

### Claim 6 (depends on 1)

The method of claim 1, wherein the source BS is new radio (NR) and a target BS is evolved universal terrestrial radio access (E-UTRA).

### Claim 7 (depends on 1)

The method of claim 1, wherein the source BS is E-UTRA and a target BS is NR.

### Claim 8

A user equipment (UE) in a wireless communication for performing handover between different radio access technologies, the UE comprising:
a transceiver;
a memory; and
at least one processor coupled with the memory and configured to:
receive a radio resource control (RRC) message;
identify whether a full configuration indicator is included in the RRC message;
in case that the full configuration indicator is not included in the RRC message, maintain configuration information of a packet data convergence protocol (PDCP) layer or a service data adaptation protocol (SDAP) layer configured in a source base station (BS); and
based on the identification that the full configuration indicator is not included in the RRC message, use, for a target BS, the maintained configuration information of the PDCP layer or the SDAP layer configured in the source BS.

### Claim 9 (depends on 8)

The UE of claim 8, the at least one processor further configured to:
in case that the full configuration indicator is included in the RRC message, release the configuration information of the PDCP layer or the SDAP layer configured in the source BS for all bearers.

### Claim 10 (depends on 8)

The UE of claim 8, the at least one processor further configured to:
reset media access control (MAC) layer;
stop all timers that are running;
release configured security configuration information; or
release configuration information of a radio link control (RLC) layer or the MAC layer.

### Claim 11 (depends on 8)

The UE of claim 8, wherein the RRC message comprises an RRC reconfiguration message or an RRC resume message.

### Claim 12 (depends on 8)

The UE of claim 8, the at least one processor further configured to:
identify successful completion of the handover between the different radio access technologies.

### Claim 13 (depends on 8)

The UE of claim 8, wherein the source BS is new radio (NR) and a target BS is evolved universal terrestrial radio access (E-UTRA).

### Claim 14 (depends on 8)

The UE of claim 8, wherein the source BS is E-UTRA and a target BS is NR.

### Claim 15

A method performed by a source base station (BS) in a wireless communication for performing handover between different radio access technologies, the method comprising:
transmitting, to a user equipment (UE), a radio resource control (RRC) message including a full configuration indicator,
wherein the full configuration indicator is associated with whether the UE maintains or releases configuration information of a packet data convergence protocol (PDCP) layer or a service data adaptation protocol (SDAP) layer configured in the source BS, and
wherein the full configuration indicator is associated with whether the UE uses, for a target BS, the configuration information of the PDCP layer or the SDAP layer configured in the source BS.

### Claim 16 (depends on 15)

The method of claim 15, wherein the RRC message comprises an RRC reconfiguration message or an RRC resume message.

### Claim 17

A source base station (BS) in a wireless communication for performing handover between different radio access technologies, the source BS comprising:
a transceiver;
a memory; and
at least one processor coupled with the memory and configured to:
transmit, to a user equipment (UE), a radio resource control (RRC) message including a full configuration indicator,
wherein the full configuration indicator is associated with whether the UE maintains or releases configuration information of a packet data convergence protocol (PDCP) layer or a service data adaptation protocol (SDAP) layer configured in the source BS, and
wherein the full configuration indicator is associated with whether the UE uses, for a target BS, the configuration information of the PDCP layer or the SDAP layer configured in the source BS.

### Claim 18 (depends on 17)

The source BS of claim 17, wherein the RRC message comprises an RRC reconfiguration message or an RRC resume message.