# US 2020/0396709 A1 · Method and apparatus for timing advance adjustment

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- Number: US 2020/0396709 A1
- Document ID: US20200396709A1
- Status: Published application
- Kind: A1
- Application number: 16/968,208
- Filed: 2018-02-09
- Published: 2020-12-17
- Earliest claimed: 2018-02-09
- Assignees: Lenovo (Beijing) Limited
- Applicants: Lenovo (Beijing) Limited
- Inventors: Zhennian Sun; Haipeng Lei; Hongmei Liu; Chenxi Zhu
- Web page: https://patentgrep.com/patent/US20200396709A1

## CPC

- H04W 56/0015: {one node acting as a reference for the others}
- H04W 56/0045: {compensating for timing error by altering transmission time}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 5/10: with dynamo-electric generation of carriers; with mechanical filters or demodulators
- H04W 8/24: Transfer of terminal data
- H04W 56/001: {Synchronization between nodes}
- H04W 80/02: Data link layer protocols
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

The present disclosure relates to methods and apparatuses timing advance adjustment. According to some embodiments of the disclosure, a method includes: receiving a timing advance command; determining a timing advance adjustment gap based on the received timing advance command, wherein the timing advance adjustment gap is k symbols, and k is a nature number larger than one; applying the corresponding adjustment of uplink transmission timing from k symbols later than the end of the physical channel carrying the timing advance command.

## Claims

### Claim 1

A method, comprising:
receiving a timing advance command;
determining a timing advance adjustment gap based on the received timing advance command, wherein the timing advance adjustment gap is k symbols, and k is a nature number larger than one; and
applying the corresponding adjustment of uplink transmission timing from k symbols later than the end of the physical channel carrying the timing advance command.

### Claim 2 (depends on 1)

The method of claim 1, wherein
k
=
ceiling

(
Δ
T
symbol
)
,
Δ is a timing advance adjustment gap in time level, and Tsymbol is a length of symbol with respect to a subcarrier spacing of uplink transmission.

### Claim 3 (depends on 2)

The method of claim 2, wherein the timing advance command is received from message 2 during a random access procedure.

### Claim 4 (depends on 3)

The method of claim 3, wherein Δ is the sum of User Equipment Physical Downlink Shared Channel processing procedure time, User Equipment Physical Uplink Shared Channel preparation procedure time, Media Access Control processing time and a timing advance value.

### Claim 5 (depends on 4)

The method of claim 4, wherein the User Equipment Physical Downlink Shared Channel processing time is determined by a User Equipment capability and a Physical Downlink Shared Channel Demodulation Reference Signal configuration.

### Claim 6 (depends on 5)

The method of claim 5, wherein the Physical Downlink Shared Channel Demodulation Reference Signal configuration is a front loaded DMRS Demodulation Reference Signal plus additional Demodulation Reference Signal configuration.

### Claim 7 (depends on 4)

The method of claim 4, wherein the User Equipment Physical Uplink Shared Channel preparation time is determined by a User Equipment capability.

### Claim 8 (depends on 7)

The method of claim 7, wherein the User Equipment Physical Uplink Shared Channel preparation time is a predefined value with the weakest User Equipment capability.

### Claim 9 (depends on 2)

The method of claim 2, wherein the timing advance command is received from a Media Access Control control element in Physical Downlink Shared Channel.

### Claim 10 (depends on 9)

The method of claim 9, wherein Δ is the sum of User Equipment PDSCH Physical Downlink Shared Channel processing time, Media Access Control processing time and a timing advance value.

### Claim 11 (depends on 10)

The method of claim 10, wherein the User Equipment Physical Downlink Shared Channel processing time is determined by a User Equipment capability and a Physical Downlink Shared Channel Demodulation Reference Signal configuration.

### Claim 12 (depends on 11)

The method of claim 11, wherein the timing advance adjustment gap is common for all User Equipments controlled by the same base station, and the Physical Downlink Shared Channel Demodulation Reference Signal configuration is a front loaded Demodulation Reference Signal plus additional Demodulation Reference Signal configuration.

### Claim 13 (depends on 11)

The method of claim 11, wherein the timing advance adjustment gap is User Equipment specified, and the Physical Downlink Shared Channel Demodulation Reference Signal configuration is a front loaded Demodulation Reference Signal configuration or a front loaded Demodulation Reference Signal plus additional Demodulation Reference Signal configuration.

### Claim 14 (depends on 6)

The method of claim 6, wherein the User Equipment Physical Downlink Shared Channel processing time is a predefined value with the front loaded Demodulation Reference Signal plus additional Demodulation Reference Signal configuration and the weakest UE User Equipment capability.

### Claim 15 (depends on 4)

The method of claim 4, wherein the timing advance value is the maximum timing advance value provided in the timing advance command within a predefined range.

### Claim 16 (depends on 10)

The method of claim 10, wherein the User Equipment Physical Downlink Shared Channel processing time depends on the capability and Physical Downlink Shared Channel Demodulation Reference Signal configuration of a corresponding User Equipment.

### Claim 17 (depends on 16)

The method of claim 16, wherein the corresponding User Equipment is in a CONNECTED mode, and reports its capability.

### Claim 18 (depends on 10)

The method of claim 10, wherein the timing advance value is a new timing advance value adjusted according to a previous timing advance value and the received timing advance command.

### Claim 19 (depends on 4)

The method of claim 4, wherein the Media Access Control processing latency is a default value.

### Claim 20

An apparatus, comprising:
a receiver that receives a timing advance command;
a processor coupled to the receiver that determines a timing advance adjustment gap based on the received timing advance command, wherein the timing advance adjustment gap is k symbols, and k is a nature number larger than one; and
a transmitter coupled to the processor that applies the corresponding adjustment of uplink transmission timing from k symbols later than the end of the physical channel carrying the timing advance command.

### Claim 21

(canceled)

### Claim 22

(canceled)

### Claim 23

(canceled)

### Claim 24

(canceled)

### Claim 25

(canceled)

### Claim 26

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### Claim 27

(canceled)

### Claim 28

(canceled)

### Claim 29

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### Claim 30

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### Claim 31

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### Claim 32

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### Claim 33

(canceled)

### Claim 34

(canceled)

### Claim 35

(canceled)

### Claim 36

(canceled)

### Claim 37

(canceled)

### Claim 38

(canceled)