Methods, Devices, and Systems for Discontinuous Reception for a Shortened Transmission Time Interval and Processing Time

• US 20180049272A1
• Filed: 06/27/2017
• Published: 02/15/2018
• Est. Priority Date: 08/12/2016
• Status: Active Grant

• Current Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Original Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Inventors: Bagheri, Hossein, Nory, Ravikiran, Nangia, Vijay, Kuchibhotla, Ravi
• Granted Patent: US 10,609,758 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1883 using multiple timers
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 52/0209 in terminal devices terminal devices per se H04W88/02
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and apparatus for discontinuous reception for a shortened transmission time interval and processing time includes a device monitoring for data transmission scheduling assignments during an active time of a DRX cycle, and detecting a transmission during the active time. The method further includes the device starting a first timer, in response to the detecting, wherein the first timer is set for a first timer value that specifies an amount of time between detecting the transmission and starting a second timer that extends the active time by a second timer value. The first timer value is determined based on one or both of a selected first TTI length from multiple TTI lengths for which the device can be enabled and/or a selected shorter first processing time over a second processing time associated with a TTI length used by the device.

Claims

1. A method performed by a device, the method comprising:

monitoring for data transmission scheduling assignments during an active time of a discontinuous reception cycle, and detecting a transmission during the active time; and

starting a first timer, in response to the detecting, wherein the first timer is set for a first timer value that specifies an amount of time between detecting the transmission and starting a second timer that extends the active time by a second timer value;

wherein the first timer value is determined based on one or both of;

a selected first transmission time interval length from multiple transmission time interval lengths for which the device can be enabled;

or

a selected shorter first processing time over a second processing time associated with a transmission time interval length used by the device.

2. The method of claim 1, wherein one or both of the first transmission time interval length or the first processing time is selected based on an indication from a network.

3. The method of claim 1, wherein the first timer value is a HARQ round trip time timer value used by the device, and the second timer value is a discontinuous reception retransmission timer value used by the device.

4. The method of claim 3, wherein the HARQ round trip time timer value used by the device is different from a HARQ round trip time timer value used by a different device.

5. The method of claim 1, wherein the first transmission time interval is shorter than a second transmission time interval of the multiple transmission time intervals.

6. The method of claim 1, wherein the first transmission time interval is used for sending the transmission that was detected during the active time.

7. The method of claim 1, wherein the shorter first processing time is based on a minimum time duration between receiving an uplink grant during the active time and a corresponding uplink transmission by the device.

8. The method of claim 1, wherein the shorter first processing time is based on a minimum time duration between receiving downlink data and corresponding downlink HARQ feedback transmitted by the device.

9. The method of claim 1 further comprising receiving the first timer value from a network.

10. The method of claim 1 further comprising determining the first timer value.

11. The method of claim 10, wherein the first timer value corresponds to a particular downlink HARQ process.

12. The method of claim 10 further comprising receiving at least one timer value adjustment factor from the network to use in determining the first timer value.

13. The method of claim 12, wherein the at least one received timer value adjustment factor comprises a set of transport block size parameters.

14. The method of claim 13, wherein the set of transport block size parameters is received from the network, the method further comprising:

determining, based on the transport block size parameters, a transport block size; and

determining, based on the transport block size, a transport block size restriction used in determining the first timer value.

15. The method of claim 12, wherein the at least one received timer value adjustment factor comprises a transport block size.

16. The method of claim 15, wherein the transport block size is received from the network, the method further comprising determining, based on the transport block size, a transport block size restriction used in determining the first timer value.

17. The method of claim 12, wherein the at least one received timer value adjustment factor comprises one or both of:

a transport block size restriction;

or

a timing advance restriction.

18. The method of claim 10 further comprising determining a transport block size restriction, used in determining the first timer value, by selecting from one of multiple stored transport block size restrictions, wherein the selecting is based on a received transport block size or a received set of transport block size parameters.

19. The method of claim 10 further comprising:

receiving a control signal from a network;

selecting the first transmission time interval based on the control signal; and

determining the first timer value based on the first transmission time interval.

20. A device comprising:

a communication interface and processor operatively coupled together to;

monitor for data transmission scheduling assignments during an active time of a discontinuous reception cycle, and detect a transmission during the active time; and

start a first timer, in response to the detection, wherein the first timer is set for a first timer value that specifies an amount of time between the detection of the transmission and starting a second timer that extends the active time by a second timer value;

wherein the first timer value is determined based on one or both of;

a selected first transmission time interval length from multiple transmission time interval lengths for which the device can be enabled;

or

a selected shorter first processing time over a second processing time associated with a transmission time interval length used by the device.