# US 2019/0174354 A1 · UL SCHEDULING TIMING WITH SHORT TTIs IN TDD

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- Number: US 2019/0174354 A1
- Document ID: US20190174354A1
- Status: Published application
- Kind: A1
- Application number: 16/323,605
- Filed: 2017-08-10
- Published: 2019-06-06
- Earliest claimed: 2016-08-12
- Assignees: Telefonaktiebolaget LM Ericsson (publ)
- Applicants: Telefonaktiebolaget LM Ericsson (publ)
- Inventors: Jingya Li; Laetitia Falconetti; Daniel Larsson; Henrik Sahlin; Gustav Wikström
- Web page: https://patentgrep.com/patent/US20190174354A1

## CPC

- H04W 28/082: among bearers or channels
- H04L 5/1469: {using time-sharing}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 72/52: based on load
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- 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

Systems and methods for determining and utilizing an uplink scheduling timing when using short Transmission Time Intervals (sTTIs) are disclosed. In some embodiments, a method of operation of a wireless device in a cellular communications network comprises receiving an uplink grant in sTTI n; determining, based on a configured uplink/downlink configuration, an uplink scheduling timing I; and transmitting, in a sTTI n+I, an uplink transmission in accordance with the uplink grant received in the sTTI n. In this manner, an uplink timing is determined and utilized when using sTTIs.

## Claims

### Claim 1

A method of operation of a wireless device in a cellular communications network, comprising:
receiving an uplink grant in short Transmission Transmit Interval, sTTI, n; and
determining, based on a configured uplink/downlink configuration, an uplink scheduling timing l; and
transmitting, in a sTTI n+l, an uplink transmission in accordance with the uplink grant received in the sTTI n.

### Claim 2 (depends on 1)

The method of claim 1 wherein the uplink scheduling timing l is a smallest integer number of sTTIs that is larger than or equal to a predefined minimum uplink scheduling timing value such that n+l is an uplink sTTI.

### Claim 3 (depends on 1)

The method of claim 1 wherein the uplink scheduling timing l is defined based on a load balancing approach in which uplink scheduling grants are equally distributed over different downlink sTTIs.

### Claim 4 (depends on 1)

The method of claim 1 wherein the uplink grant schedules multiple uplink sTTIs for the same wireless device.

### Claim 5 (depends on 4)

The method of claim 4 wherein the uplink grant comprises an indication of one or more uplink sTTIs for which the uplink grant is valid.

### Claim 6 (depends on 1)

The method of claim 1 wherein an uplink part of special subframes can be used for uplink data transmission, and determining the uplink scheduling timing l comprises determining the uplink scheduling timing l in such a manner that the uplink part of the special subframes are treated as uplink sTTIs.

### Claim 7 (depends on 1)

The method of claim 1 wherein determining the uplink scheduling timing l comprises determining the uplink scheduling timing l based on a predefined table that defines values of l for different values of n for the configured uplink/downlink configuration.

### Claim 8 (depends on 7)

The method of claim 7 wherein the predefined table defines the values of l for the different values of n for the configured uplink/downlink configuration in such a manner that an uplink part of special subframes are treated as uplink sTTIs.

### Claim 9 (depends on 7)

The method of claim 7 wherein the predefined table defines the values of l for the different values of n for the configured uplink/downlink configuration in such a manner that an uplink part of special subframes are not treated as uplink sTTIs.

### Claim 10 (depends on 7)

The method of claim 7 wherein the predefined table defines the values of l for the different values of n in accordance with a latency optimization scheme.

### Claim 11 (depends on 7)

The method of claim 7 wherein the predefined table defines the values of l for the different values of n in accordance with a load sharing scheme.

### Claim 12 (depends on 1)

The method of claim 1 wherein the sTTI n and the sTTI n+l each have a duration of less than 1 millisecond.

### Claim 13 (depends on 1)

The method of claim 1 wherein the sTTI n and the sTTI n+l each have a duration of less than 0.5 milliseconds.

### Claim 14

(canceled)

### Claim 15

(canceled)

### Claim 16

A wireless device in a cellular communications network, comprising:
at least one transceiver;
at least one processor; and
memory comprising instructions executable by the at least one processor whereby the wireless device is operable to:
receive an uplink grant in short Transmission Time Interval, sTTI, n;
determine, based on a configured uplink/downlink configuration, an uplink scheduling timing l; and
transmit, in a sTTI n+l, an uplink transmission in accordance with the uplink grant received in the sTTI n.

### Claim 17

(canceled)

### Claim 18

A method of operation of a radio access node in a cellular communications network, comprising:
transmitting an uplink grant to a wireless device in a short Transmission Time Interval, sTTI, n; and
receiving, in a short TTI n+l, an uplink transmission from the wireless device in accordance with the uplink grant transmitted to the wireless device in the sTTI n, where l is an uplink scheduling timing l.

### Claim 19 (depends on 18)

The method of claim 18 wherein the uplink scheduling timing l is a smallest integer number of sTTIs that is larger than or equal to a predefined minimum uplink scheduling timing value such that n+l is an uplink sTTI.

### Claim 20 (depends on 18)

The method of claim 18 wherein the uplink scheduling timing l is defined based on a load balancing approach in which uplink scheduling grants are equally distributed over different downlink sTTIs.

### Claim 21 (depends on 18)

The method of claim 18 wherein the uplink grant schedules multiple uplink sTTIs for the same wireless device.

### Claim 22 (depends on 21)

The method of claim 21 wherein the uplink grant comprises an indication of one or more uplink sTTIs for which the uplink grant is valid.

### Claim 23 (depends on 18)

The method of claim 18 wherein an uplink part of special subframes can be used for uplink data transmission, and the uplink scheduling timing l is determined in such a manner that the uplink part of the special subframes are treated as uplink sTTIs.

### Claim 24 (depends on 18)

The method of claim 18 wherein the uplink scheduling timing l is determined based on a predefined table that defines values of l for different values of n for a Time Division Duplexing, TDD, uplink/downlink configuration.

### Claim 25 (depends on 24)

The method of claim 24 wherein the predefined table defines the values of l for the different values of n for the TDD uplink/downlink configuration in such a manner that an uplink part of special subframe are treated as uplink sTTIs.

### Claim 26 (depends on 24)

The method of claim 24 wherein the predefined table defines the values of l for the different values of n for the TDD uplink/downlink configuration in such a manner that an uplink part of special subframes are not treated as uplink sTTIs.

### Claim 27 (depends on 24)

The method of claim 24 wherein the predefined table defines the values of l for the different values of n in accordance with a latency optimization scheme.

### Claim 28 (depends on 24)

The method of claim 24 wherein the predefined table defines the values of l for the different values of n in accordance with a load sharing scheme.

### Claim 29 (depends on 18)

The method of claim 18 wherein the sTTI n and the sTTI n+l each have a duration of less than 1 millisecond.

### Claim 30 (depends on 18)

The method of claim 18 wherein the sTTI n and the sTTI n+l each have a duration of less than 0.5 milliseconds.

### Claim 31

(canceled)

### Claim 32

(canceled)

### Claim 33

A radio access node for a cellular communications network, comprising:
at least one transceiver;
at least one processor; and
memory comprising instructions executable by the at least one processor whereby the radio access node is operable to:
transmit an uplink grant to a wireless device in a short Transmission Time Interval, sTTI, n; and
receive, in a sTTI n+l, an uplink transmission from the wireless device in accordance with the uplink grant transmitted to the wireless device in the sTTI n, where l is an uplink scheduling timing l.

### Claim 34

(canceled)