# US 11,115,156 B2 · Discontinuous reception operations among multiple bandwidth parts

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- Number: US 11,115,156 B2
- Document ID: US11115156B2
- Status: Granted
- Kind: B2
- Application number: 16/198,837
- Filed: 2018-11-22
- Published: 2019-05-23
- Granted: 2021-09-07
- Earliest claimed: 2017-11-22
- Assignees: FG Innovation Company Limited
- Applicants: FG Innovation IP Company Limited
- Inventors: Chia-Hung Wei; Chie-Ming Chou
- Web page: https://patentgrep.com/patent/US11115156B2

## CPC

- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L 1/1848: {Time-out mechanisms}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX]
- Y02D 30/70: in wireless communication networks
- 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)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A user equipment (UE) for discontinuous reception (DRX) operation having a Downlink DRX Hybrid Automatic Repeat reQuest (HARQ) Round-Trip Time Timer (drx-HARQ-RTT-TimerDL) is disclosed. The UE comprises one or more non-transitory computer-readable media having computer-executable instructions embodied thereon; at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the computer-executable instructions to perform the DRX operation, wherein the DRX operation comprises: starting the drx-HARQ-RTT-TimerDL from an initial value in a first symbol after an end of a corresponding transmission carrying a DL HARQ feedback, the DL HARQ feedback corresponding to downlink data. The initial value is represented in number of symbols of a BWP (bandwidth part) where the downlink data is received.

## Claims

### Claim 1

A user equipment (UE) for discontinuous reception (DRX) operation having a Downlink DRX Hybrid Automatic Repeat reQuest (HARQ) Round-Trip Time Timer (drx-HARQ-RTT-TimerDL), the UE comprising:
one or more non-transitory computer-readable media having computer-executable instructions embodied thereon; and
at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the computer-executable instructions to perform the DRX operation, wherein the DRX operation comprises:
receiving a downlink (DL) data on a DL bandwidth part (BWP);
performing an uplink (UL) transmission carrying a DL HARQ feedback corresponding to the DL data on a UL BWP; and
starting the drx-HARQ-RTT-TimerDL in a first symbol of a plurality of symbols of the DL BWP immediately after an end of the UL transmission, wherein:
each symbol in the plurality of symbols comprises a scalable time unit having a length that is a variable fraction of a fixed time unit, and
the drx-HARQ-RTT-TimerDL starts running from an initial value that is represented in a number of symbols of the DL BWP.

### Claim 2 (depends on 1)

The UE of claim 1, wherein a symbol length of at least one of the number of symbols is determined by a subcarrier spacing (SCS) of the DL BWP.

### Claim 3 (depends on 1)

The UE of claim 1, wherein the drx-HARQ-RTT-TimerDL is a timer configured by a base station to the UE to specify when to start an active time period during which the UE is to monitor a Physical Downlink Control CHannel (PDCCH).

### Claim 4 (depends on 1)

The UE of claim 1, wherein the drx-HARQ-RTT-TimerDL starts running from the initial value towards zero or before being stopped.

### Claim 5

A method for discontinuous reception (DRX) operation having a Downlink DRX Hybrid Automatic Repeat reQuest (HARQ) Round-Trip Time Timer (drx-HARQ-RTT-TimerDL) for a user equipment (UE), the method comprising:
receiving, by reception circuitry of the UE, a downlink (DL) data on a DL bandwidth part (BWP);
performing, by transmission circuitry of the UE, an uplink (UL) transmission carrying a DL HARQ feedback corresponding to the DL data on a UL BWP; and
starting, by a processor of the UE, the drx-HARQ-RTT-TimerDL in a first symbol of a plurality of symbols of the DL BWP immediately after an end of the UL transmission, wherein:
each symbol in the plurality of symbols comprises a scalable time unit having a length that is a variable fraction of a fixed time unit, and
the drx-HARQ-RTT-TimerDL starts running from an initial value that is represented in a number of symbols of the DL BWP.

### Claim 6 (depends on 5)

The method of claim 5, wherein a symbol length of at least one of the number of symbols is determined by a subcarrier spacing (SCS) of the DL BWP.

### Claim 7 (depends on 5)

The method of claim 5, wherein the drx-HARQ-RTT-TimerDL is a timer configured by a base station to the UE to specify when to start an active time period during which the UE is to monitor a Physical Downlink Control CHannel (PDCCH).

### Claim 8 (depends on 5)

The method of claim 5, wherein the drx-HARQ-RTT-TimerDL starts running from the initial value towards zero or before being stopped.