# US 2021/0345271 A1 · User equipment and base station apparatus

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- Number: US 2021/0345271 A1
- Document ID: US20210345271A1
- Status: Published application
- Kind: A1
- Application number: 17/283,585
- Filed: 2019-08-29
- Published: 2021-11-04
- Earliest claimed: 2018-11-13
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Takuma Takada; Tooru Uchino; Hiroki Harada
- Web page: https://patentgrep.com/patent/US20210345271A1

## CPC

- H04L 5/001: {the frequencies being arranged in component carriers}
- H04W 56/0005: {synchronizing of arrival of multiple uplinks}
- H04L 5/0035: {Resource allocation in a cooperative multipoint environment}
- H04W 56/0045: {compensating for timing error by altering transmission time}
- 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 control unit configured to determine, based on a difference between a first timing advance value of a first cell group in dual connectivity and a second timing advance value of a second cell group in the dual connectivity, a transmission timing for the first cell group and a transmission timing for the second cell group, and a transmitting unit configured to perform transmission in the first cell group based on the determined transmission timing for the first cell group, and perform transmission in the second cell group based on the determined transmission timing for the second cell group.

## Claims

### Claim 1

A user equipment comprising:
a control unit configured to determine, based on a difference between a first timing advance value of a first cell group in dual connectivity and a second timing advance value of a second cell group in the dual connectivity, a transmission timing for the first cell group and a transmission timing for the second cell group; and
a transmitting unit configured to perform transmission in the first cell group based on the determined transmission timing for the first cell group, and perform transmission in the second cell group based on the determined transmission timing for the second cell group.

### Claim 2 (depends on 1)

The user equipment according to claim 1, wherein in a case where the difference between the first timing advance value and the second timing advance value exceeds a predetermined value, the control unit determines the determined transmission timing for the second cell group as the first timing advance value.

### Claim 3 (depends on 1)

The user equipment according to claim 1, wherein in a case where the first timing advance value is configured for a primary timing alignment group of the first cell group, and a third timing advance value is configured for a secondary timing alignment group of the first cell group, and the difference between the first timing advance value and the second timing advance value exceeds a predetermined value, the control unit determines, as the transmission timing for the second cell group, a timing advance value configured for a timing alignment group determined from among the primary timing alignment group of the first cell group and the secondary timing alignment group of the first cell group based on whichever frequency, from among a frequency of a master cell belonging to the primary timing alignment group of the first cell and a frequency of a secondary cell belonging to the secondary timing alignment group of the first cell group, is closer to a frequency of a master cell of the second cell group.

### Claim 4 (depends on 3)

The user equipment according to claim 3, wherein in a case where the second timing advance value is configured for a primary timing alignment group of the second cell group, and a fourth timing advance value is configured for a secondary timing alignment group of the second cell group, and the difference between the first timing advance value and the second timing advance value exceeds the predetermined value, the control unit determines, as the transmission timing for the secondary timing alignment group of the second cell group, a timing advance value configured for a timing alignment group determined from among the primary timing alignment group of the first cell group and the secondary timing alignment group of the first cell group based on whichever frequency, from among the frequency of the master cell belonging to the primary timing alignment group of the first cell and the frequency of the secondary cell belonging to the secondary timing alignment group of the first cell group, is closer to the frequency of the master cell of the second cell group.

### Claim 5

A base station apparatus comprising:
a control unit configured to determine a reception timing for the first cell group and a reception timing for the second cell group based on a difference between a first timing advance value for the first cell group in dual connectivity and a second timing advance value for the second cell group in the dual connectivity; and
a receiving unit configured to execute reception in the first cell group based on the determined reception timing of the first cell group, and execute reception in the second cell group based on the determined reception timing of the second cell group.