Methods, devices, and systems for discontinuous reception for a shortened transmission time interval and processing time

• US 10,602,567 B2
• Filed: 06/27/2017
• Issued: 03/24/2020
• 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
• Primary Examiner(s): Hailu, Kibrom T
• Application Number:
  US15/633,876
• Publication Number:
  US 20180049271A1
• Time in Patent Office: 1,001 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 receiving, from a network, an indication to enable a first TTI which is a shorter TTI than a second TTI for which the device can be enabled. The method further includes the device switching from monitoring for data transmission scheduling assignments under the control of a DRX configuration associated with the second transmission time interval to monitoring for the data transmission scheduling assignments based on the first transmission time interval.

Claims

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

receiving, from a network, an indication to enable a first transmission time interval which is a shorter transmission time interval than a second transmission time interval;

wherein the first transmission time interval is associated with a first discontinuous reception configuration, and the second transmission time interval is associated with a second discontinuous reception configuration, wherein the first and second discontinuous reception configurations comprise different discontinuous reception parameters, the method further comprising

determining a third discontinuous reception configuration based on the first and second discontinuous reception configurations, and

enabling the third discontinuous reception configuration to control monitoring for the data transmission scheduling assignments based on one or both of the first or the second transmission time intervals.

2. The method of claim 1, wherein the first transmission time interval comprises a first set of OFDM symbols, and the second transmission time interval comprises a second set of OFDM symbols.

3. The method of claim 1, wherein:

the first transmission time interval has a shorter length than the second transmission time interval;

or

the first transmission time interval has a same length as the second transmission time interval but is associated with a shorter data transmission processing time than a data transmission processing time associated with the second transmission time interval.

4. The method of claim 1, wherein the second transmission time interval is a transmission time interval with which the device is enabled upon initially connecting to the network.

5. The method of claim 1, wherein monitoring for data transmission scheduling assignments comprises one or both of:

attempting to decode data transmission scheduling assignments;

or

continuously monitoring for data transmission scheduling assignments.

6. The method of claim 5, wherein continuously monitoring for data transmission scheduling assignments comprises disabling a discontinuous reception functionality associated with the second transmission time interval.

7. The method of claim 6 further comprising:

receiving, from the network, an indication to disable the first transmission time interval;

enabling the discontinuous reception configuration associated with the second transmission time interval; and

monitoring for the data transmission scheduling assignments under the control of the discontinuous reception configuration associated with the second transmission time interval.

8. The method of claim 1, wherein the first transmission time interval is associated with a first discontinuous reception configuration, and the second transmission time interval is associated with a second discontinuous reception configuration, wherein the first and second discontinuous reception configurations comprise different discontinuous reception parameters, the method further comprising:

enabling the first discontinuous reception configuration using the associated discontinuous reception parameters to control monitoring for the data transmission scheduling assignments based on the first transmission time interval.

9. The method of claim 8, wherein the first discontinuous reception configuration provides a longer active time for monitoring for the data transmission scheduling assignments than the second discontinuous reception configuration.

10. The method of claim 9, wherein the discontinuous reception parameters for the first discontinuous reception configuration comprises a first on-duration timer value, and the discontinuous reception parameters for the second discontinuous reception configuration comprises a second on-duration timer value, wherein the longer active time is due at least in part to the first on-duration timer value being larger than the second on-duration timer value.

11. The method of claim 8 further comprising:

receiving first discontinuous reception parameters for the first discontinuous reception configuration and second discontinuous reception parameters for the second discontinuous reception configuration, from the network, before receiving the indication to enable the first transmission time interval; and

selecting the first transmission time interval and configuring the device using the first discontinuous reception parameters, after receiving the indication to enable the first transmission time interval, to enable the first discontinuous reception configuration.

12. The method of claim 8 further comprising:

receiving second discontinuous reception parameters for the second discontinuous reception configuration, from the network, before receiving the indication to enable the first transmission time interval; and

receiving first discontinuous reception parameters for the first discontinuous reception configuration, from the network, at the time of or after receiving the indication to enable the first transmission time interval, wherein the first discontinuous reception parameters are used to enable the first discontinuous reception configuration.

13. The method of claim 1 where determining the third discontinuous reception configuration comprises determining a union of at least one of the discontinuous reception parameters of the first and second discontinuous reception configurations.

14. The method of claim 13, wherein determining a union of at least one of the discontinuous reception parameters of the first and second discontinuous reception configurations comprises one or both of:

determining a union of a first active time for monitoring for the data transmission scheduling assignments and a second active time for monitoring for the data transmission scheduling assignments, wherein the first active time is provided by the first discontinuous reception configuration and the second active time is provided by the second discontinuous reception configuration;

or

determining a union of a first inactive time for monitoring for the data transmission scheduling assignments and a second inactive time for monitoring for the data transmission scheduling assignments, wherein the first inactive time is provided by the first discontinuous reception configuration and the second inactive time is provided by the second discontinuous reception configuration.

15. The method of claim 1, wherein monitoring for data transmission scheduling assignments based on the first transmission time interval comprises monitoring for the data transmission scheduling assignments under the control of a discontinuous reception configuration associated with the first transmission time interval which comprises a set of discontinuous reception parameters, the method further comprising:

configuring the device for an active time for performing the monitoring and an inactive time for disabling the monitoring, wherein the active and inactive times are based on a first parameter of the set of discontinuous reception parameters; and

detecting only one part of a two-part scheduling assignment while monitoring during the active time, and resultantly extending the active time by an additional time period to continue performing the monitoring, wherein the additional time period is based on a second parameter of the set of discontinuous reception parameters.

16. The method of claim 1, wherein monitoring for data transmission scheduling assignments based on the first transmission time interval comprises monitoring for the data transmission scheduling assignments under the control of a discontinuous reception configuration associated with the first transmission time interval, which comprises a set of discontinuous reception parameters having a first timer value and a second timer value, wherein the first timer value specifies an amount of time between detecting a transmission, while performing the monitoring, and starting a timer for the second timer value, wherein the first timer value is adjustable based on one or more adjustment factors.

17. The method of claim 8, wherein at least a value of a discontinuous reception transmission timer of the first discontinuous reception configuration and a value of a discontinuous reception transmission timer of the second discontinuous reception configuration are different.

18. A device comprising:

a communication interface and processor operatively coupled together to;

receive, from a network, an indication to enable a first transmission time interval which is a shorter transmission time interval than a second transmission time interval for which the device can be enabled;

wherein the first transmission time interval is associated with a first discontinuous reception configuration, and the second transmission time interval is associated with a second discontinuous reception configuration, wherein the first and second discontinuous reception configurations comprise different discontinuous reception parameters, the method further comprising

determining a third discontinuous reception configuration based on the first and second discontinuous reception configurations, and

enabling the third discontinuous reception configuration to control monitoring for the data transmission scheduling assignments based on one or both of the first or the second transmission time intervals.