Method and apparatus for controlling discontinuous reception in mobile communication system

• US 9,806,873 B2
• Filed: 08/07/2012
• Issued: 10/31/2017
• Est. Priority Date: 05/09/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Soeng Hun, Van Lieshout, Gert-Jan, Jang, Jae Hyuk
• Primary Examiner(s): Pham, Chi H
• Assistant Examiner(s): HYUN, SOON D
• Application Number:
  US14/397,007
• Publication Number:
  US 20150117286A1
• Time in Patent Office: 1,911 Days
• Field of Search: None
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0098 Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 4/18 Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0241 where no transmission is received, e.g. out of range of the transmitter
• CPC Class Codes: H04W 56/0005 synchronizing of arrival of multiple uplinks
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/27 between access points
• CPC Class Codes: H04W 76/12 Setup of transport tunnels
• CPC Class Codes: H04W 76/15 Setup of multiple wireless link connections
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: H04W 76/34 Selective release of ongoing connections
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The present invention relates to a method and apparatus for controlling discontinuous reception (DRX) in a mobile communication system. The method for controlling the DRX of a terminal in a mobile communication system includes the steps of: receiving DRX-setting information from a base station; determining whether or not a first condition is satisfied, the first condition being that a current subframe exists between a first time point when receiving the DRX-setting information and a second time point when an event triggering the application of a short DRX cycle occurs; and applying a preset DRX cycle when the first condition is satisfied.

Claims

1. A method by a terminal in a mobile communication system, comprising:

receiving discontinuous reception (DRX) configuration information from a base station;

performing a DRX operation by applying a preset DRX cycle after the DRX configuration information is received;

identifying whether a physical downlink channel (PDCCH) indicating a new transmission is received;

identifying whether a channel quality indication (CQI) mask is configured;

identifying whether the preset DRX cycle is changed into a short DRX cycle based on the PDCCH if the CQI mask is configured; and

performing the DRX operation by applying the short DRX cycle if the preset DRX cycle is changed into the short DRX cycle.

2. The method of claim 1, further comprising identifying whether a triggering condition of the short DRX cycle is satisfied,

wherein the identifying of whether the triggering condition of the short DRX cycle is satisfied comprises:

determining whether an inactivity timer has expired in a current subframe or whether a DRX instruction has been received; and

determining, if the inactivity timer has expired in the current subframe or the DRX instruction has been received, whether information related to the short DRX cycle has been received from the base station.

3. The method of claim 2, further comprising:

performing, if the information related to the short DRX cycle has not been received from the base station, the DRX operation by applying a long DRX cycle.

4. The method of claim 2, wherein the identifying of whether the triggering condition of the short DRX cycle is satisfied further comprises:

determining, if the inactivity timer has not expired in the current subframe and the DRX instruction has not been received, whether the inactivity timer is operating in the current subframe; and

determining, if the inactivity timer is operating in the current subframe, whether information related to the short DRX cycle has been received from the base station.

5. The method of claim 4, wherein the identifying of whether the triggering condition of the short DRX cycle is satisfied comprises:

determining, if the inactivity timer is not operating in the current subframe, whether a short DRX cycle timer has not expired in the current subframe; and

determining, if the short DRX cycle timer has not expired in the current subframe, whether the information related to the short DRX cycle has been received from the base station.

6. The method of claim 5, further comprising:

performing, if the short DRX cycle timer has expired, the DRX operation by applying a long DRX cycle.

7. The method of claim 1, wherein the DRX-configuration information comprises:

a duration of the short DRX cycle, a duration of a long DRX cycle, information for computing a start point of DRX, information regarding a duration of on-duration (onDuration), and information regarding an expiration (length) of an inactivity timer.

8. A terminal in a mobile communication system, comprising:

a transceiver configured to transmit and receive signals; and

a controller configured to;

control reception of discontinuous reception (DRX) configuration information from a base station,

perform a DRX operation by applying a preset DRX cycle after the DRX configuration information is received,

identify whether a physical downlink channel (PDCCH) indicating a new transmission is received,

identify whether a channel quality indication (CQI) mask is configured,

identify whether the preset DRX cycle is changed into a short DRX cycle based on the PDCCH if the CQI mask is configured, and

perform the DRX operation by applying the short DRX cycle if the preset DRX cycle is changed into the short DRX cycle.

9. The terminal of claim 8, wherein the controller is further configured to:

determine, whether an inactivity timer has expired in a current subframe or whether a DRX instruction has been received,

determine if the inactivity timer has expired in the current subframe or the DRX instruction has been received, whether information related to the short DRX cycle has been received from the base station, and

perform, if the information related to the short DRX cycle has been received from the base station, the DRX operation by applying the short DRX cycle.

10. The terminal of claim 9, wherein the controller is further configured to perform, if the information related to the short DRX cycle has not been received from the base station, the DRX operation by a long DRX cycle.

11. The terminal of claim 9, wherein the controller is further configured to:

determine, if the inactivity timer has not expired in the current subframe and the DRX instruction has not been received, whether the inactivity timer is operating in the current subframe,

determine, if the inactivity timer is operating in the current subframe, whether information related to the short DRX cycle has been received from the base station, and

perform, if the information related to the short DRX cycle has been received from the base station, the DRX operation by applying the short DRX cycle.

12. The terminal of claim 11, wherein the controller is further configured to:

determine, if the inactivity timer is not operating in the current subframe, whether a short DRX cycle timer has not expired in the current subframe,

determine, if the short DRX cycle timer has not expired, whether the information related to the short DRX cycle has been received from the base station, and

perform, if the information related to the short DRX cycle has been received from the base station, the DRX operation by applying the short DRX cycle.

13. The terminal of claim 12, wherein the controller is further configured to:

perform, if the short DRX cycle timer has expired in the current subframe, the DRX operation by applying a long DRX cycle.

14. The terminal of claim 8, wherein the DRX-configuration information comprises a duration of the short DRX cycle, a duration of a long DRX cycle, information for computing a start point of DRX, information regarding a duration of on-duration (onDuration), and information regarding an expiration (length) of an inactivity timer.