# US 10,485,052 B2 · DRX implementation method, DRX configuration method, and related device

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- Number: US 10,485,052 B2
- Document ID: US10485052B2
- Status: Granted
- Kind: B2
- Application number: 15/835,877
- Filed: 2017-12-08
- Published: 2018-04-12
- Granted: 2019-11-19
- Earliest claimed: 2015-06-11
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technologies Co., Ltd.
- Inventors: Wei Quan; Jinhua Miao; Xiaodong Yang; Jian Zhang; Bingzhao Li; Zhenxing Hu
- Web page: https://patentgrep.com/patent/US10485052B2

## CPC

- H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX]
- H04W 52/02: Power saving arrangements
- H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- Y02D 30/70: in wireless communication networks
- 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)
- 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

Embodiments of the present disclosure disclose a discontinuous reception (DRX) implementation method, a DRX configuration method, and a related device. The DRX implementation method includes: receiving, by a terminal, DRX configuration information sent by a base station, where the terminal supports short transmission time interval (TTI) subframe transmission; and performing DRX according to the DRX configuration information, a system frame number (SFN), and a number of a short TTI subframe, where the short TTI subframe is a subframe numbered according to a short TTI, and a length of the short TTI subframe is less than 1 ms. In the embodiments of the present disclosure, DRX can be implemented at a short TTI, so as to improve overall performance of a system.

## Claims

### Claim 1

A terminal, comprising:
a receiver configured to receive discontinuous reception (DRX) configuration information sent by a base station, wherein the terminal supports subframe transmission using a short transmission time interval (TTI); and
a processor configured to perform DRX according to the DRX configuration information, a system frame number (SFN), and a frame number of a short TTI subframe, wherein the short TTI subframe is a subframe numbered according to the short TTI, and wherein the short TTI subframe is less than 1 millisecond (ms) long.

### Claim 2 (depends on 1)

The terminal according to claim 1, wherein the terminal further comprises a transmitter configured to send, before the receiver receives the DRX configuration information sent by the base station, a capability notification message to the base station for notifying the base station that the terminal supports subframe transmission using the short TTI such that the terminal transmits one subframe in less than 1 ms.

### Claim 3 (depends on 1)

The terminal according to claim 1, wherein the DRX configuration information comprises a timing length of a DRX-related timer, a short DRX cycle length, a long DRX cycle length, and a DRX start offset.

### Claim 4 (depends on 3)

The terminal according to claim 3, wherein the DRX-related timer comprises an on-duration timer, a DRX inactivity timer, a DRX retransmission timer, and a hybrid automatic repeat request (HARQ) round trip time (RTT) timer.

### Claim 5 (depends on 4)

The terminal according to claim 4, wherein a timing length of the on-duration timer, a timing length of the DRX inactivity timer, and a timing length of the DRX retransmission timer that are in the DRX configuration information all use the 1 ms length of the short TTI subframe as a parameter, and wherein specific values of the timing lengths are correspondingly the same as specific values of the timing length of the on-duration timer, the timing length of the DRX inactivity timer, and the timing length of the DRX retransmission timer when the timing length of the on-duration timer, the timing length of the DRX inactivity timer, and the timing length of the DRX retransmission timer use a length of a long TTI subframe as a parameter, or
wherein a timing length of the on-duration timer, a timing length of the DRX inactivity timer, and a timing length of the DRX retransmission timer that are in the DRX configuration information all use a length of the long TTI subframe as a parameter.

### Claim 6 (depends on 4)

The terminal according to claim 4, wherein a timing length of the HARQ RTT timer in the DRX configuration information uses the 1 ms length of the short TTI subframe as a parameter, and a quantity of short TTI subframes that are comprised in the HARQ RTT timer at the short TTI is the same as a quantity of long TTI subframes that are comprised in the HARQ RTT timer at a long TTI.

### Claim 7 (depends on 5)

The terminal according to claim 5, wherein the length of the long TTI subframe is 1 ms, wherein the long TTI subframe is a subframe numbered according to the long TTI, and wherein a length of the short TTI is between 0.5 ms and 0.8 ms.

### Claim 8

A base station, comprising:
a processor configured to determine that a terminal supports using a short transmission time interval (TTI) for subframe transmission such that the terminal transmits a subframe in less than 1 millisecond (ms), wherein the subframe is numbered according to the short TTI, and wherein a length of the short TTI is less than 1 ms; and
a transmitter configured to deliver discontinuous reception (DRX) configuration information to the terminal according to the short TTI used for subframe transmission by the terminal.

### Claim 9 (depends on 8)

The base station according to claim 8, wherein the base station further comprises a receiver configured such that before the processor determines that the terminal supports using the short TTI for subframe transmission, the receiver receives a capability notification message sent by the terminal for notifying the base station that the terminal supports using the short TTI for subframe transmission.

### Claim 10 (depends on 8)

The base station according to claim 8, wherein the DRX configuration information comprises a timing length of a DRX-related timer, a short DRX cycle length, a long DRX cycle length, and a DRX start offset.

### Claim 11 (depends on 10)

The base station according to claim 10, wherein the DRX-related timer comprises an on-duration timer, a DRX inactivity timer, a DRX retransmission timer, and a hybrid automatic repeat request (HARQ) round trip time (RTT) timer.

### Claim 12 (depends on 11)

The base station according to claim 11, wherein a timing length of the on-duration timer, a timing length of the DRX inactivity timer, and a timing length of the DRX retransmission timer that are in the DRX configuration information all use the length of the short TTI as a parameter, and specific values of the timing lengths are correspondingly the same as specific values of the timing length of the on-duration timer, the timing length of the DRX inactivity timer, and the timing length of the DRX retransmission timer when the timing length of the on-duration timer, the timing length of the DRX inactivity timer, and the timing length of the DRX retransmission timer use a length of a long TTI subframe as a parameter, or
wherein a timing length of the on-duration timer, a timing length of the DRX inactivity timer, and a timing length of the DRX retransmission timer that are in the DRX configuration information all use a length of the long TTI subframe as a parameter.

### Claim 13 (depends on 11)

The base station according to claim 11, wherein a timing length of the HARQ RTT timer in the DRX configuration information uses the length of the short TTI as a parameter, and a quantity of short TTI subframes that are comprised in the HARQ RTT timer at the short TTI is the same as a quantity of long TTI subframes that are comprised in the HARQ RTT timer at a long TTI.

### Claim 14 (depends on 12)

The base station according to claim 12, wherein the length of the long TTI subframe is 1 ms, and wherein the long TTI subframe is a subframe numbered according to the long TTI.

### Claim 15

A discontinuous reception (DRX) implementation method, comprising:
receiving, by a terminal, DRX configuration information sent by a base station, wherein the terminal supports subframe transmission using a short transmission time interval (TTI); and
performing DRX according to the DRX configuration information, a system frame number (SFN), and a frame number of a short TTI subframe, wherein the short TTI subframe is a subframe numbered according to the short TTI, and wherein the short TTI subframe is less than 1 millisecond (ms) long.

### Claim 16 (depends on 15)

The method according to claim 15, wherein before receiving DRX configuration information sent by a base station, the method further comprises sending a capability notification message to the base station for notifying the base station that the terminal supports subframe transmission using the short TTI such that the terminal transmits one subframe in less than 1 ms.

### Claim 17 (depends on 15)

The method according to claim 15, wherein the DRX configuration information comprises a timing length of a DRX-related timer, a short DRX cycle length, a long DRX cycle length, and a DRX start offset.

### Claim 18 (depends on 17)

The method according to claim 17, wherein the DRX-related timer comprises an on-duration timer, a DRX inactivity timer, a DRX retransmission timer, and a hybrid automatic repeat request (HARQ) round trip time (RTT).

### Claim 19 (depends on 18)

The method according to claim 18, wherein a timing length of the on-duration timer, a timing length of the DRX inactivity timer, and a timing length of the DRX retransmission timer that are in the DRX configuration information all use the 1 ms length of the short TTI subframe as a parameter, and wherein specific values of the timing lengths are correspondingly the same as specific values of the timing length of the on-duration timer, the timing length of the DRX inactivity timer, and the timing length of the DRX retransmission timer when the timing length of the on-duration timer, the timing length of the DRX inactivity timer, and the timing length of the DRX retransmission timer use a length of a long TTI subframe as a parameter, or
wherein a timing length of the on-duration timer, a timing length of the DRX inactivity timer, and a timing length of the DRX retransmission timer that are in the DRX configuration information all use a length of the long TTI subframe as a parameter.

### Claim 20 (depends on 15)

The method according to claim 15, wherein a timing length of a hybrid automatic repeat request (HARQ) round trip time (RTT) timer in the DRX configuration information uses the 1 ms length of the short TTI subframe as a parameter, and a quantity of short TTI subframes that are comprised in the HARQ RTT timer at the short TTI is the same as a quantity of long TTI subframes that are comprised in the HARQ RTT timer at a long TTI.