# US 2021/0345173 A1 · User equipment and base station apparatus

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- Number: US 2021/0345173 A1
- Document ID: US20210345173A1
- Status: Published application
- Kind: A1
- Application number: 17/284,698
- Filed: 2018-10-31
- Published: 2021-11-04
- Earliest claimed: 2018-10-31
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Tooru Uchino; Tianyang Min; Hideaki Takahashi
- Web page: https://patentgrep.com/patent/US20210345173A1

## CPC

- H04L 1/22: using redundant apparatus to increase reliability
- 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)}
- H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)}
- H04W 76/15: Setup of multiple wireless link connections
- H04W 76/38: triggered by timers
- 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

A user equipment includes a reception unit configured to receive an instruction for packet duplication from a base station apparatus; a control unit configured to determine, based on the instruction for packet duplication, a primary RLC (Radio Link Control) and a plurality of secondary RLCs to be used with respect to packet duplication; and a communication unit configured to apply packet duplication to all or a part of the determined primary RLC and plurality of secondary RLCs and perform communication.

## Claims

### Claim 1

A user equipment comprising:
a reception unit configured to receive an instruction for packet duplication from a base station apparatus;
a control unit configured to determine, based on the instruction for packet duplication, a primary RLC (Radio Link Control) and a plurality of secondary RLCs to be used with respect to packet duplication; and
a communication unit configured to apply packet duplication to all or a part of the determined primary RLC and plurality of secondary RLCs and perform communication.

### Claim 2 (depends on 1)

The user equipment as claimed in claim 1, wherein
the control unit is configured to determine, based on the instruction for packet duplication, a secondary RLC of the plurality of secondary RLCs for which packet duplication is to be activated or deactivated.

### Claim 3 (depends on 1)

The user equipment as claimed in claim 1, wherein
the control unit is configured to deactivate packet duplication for the primary RLC and the plurality of secondary RLCs in a case where at least one of data transmission and data reception does not occur for a predetermined period.

### Claim 4 (depends on 1)

The user equipment as claimed in claim 1, further comprising
a transmission unit configured to transmit, to the base station apparatus, information indicating which RLC from among the plurality of secondary RLCs has a failure.

### Claim 5 (depends on 1)

The user equipment as claimed in claim 1, further comprising
a transmission unit configured to indicate an RLC failure to the base station apparatus when at least two or more RLCs have failures.

### Claim 6

A base station apparatus comprising:
a transmission unit configured to transmit an instruction for packet duplication to a user equipment; and
a communication unit configured to apply packet duplication to a primary RLC (Radio Link Control) and a plurality of secondary RLCs based on the instruction for packet duplication and perform communication, wherein
the instruction for packet duplication includes information indicating the primary PLC and the plurality of secondary RLCs to be used with respect to packet duplication.