System and method for discontinuous reception control start time

• US 8,811,250 B2
• Filed: 11/02/2011
• Issued: 08/19/2014
• Est. Priority Date: 09/14/2007
• Status: Active Grant

• Current Assignee: Blackberry Limited
• Original Assignee: Blackberry Limited
• Inventors: Cai, Zhijun
• Primary Examiner(s): Jaroenchonwanit, Bunjob
• Application Number:
  US13/287,731
• Publication Number:
  US 20120051226A1
• Time in Patent Office: 1,021 Days
• Field of Search: None
• US Class Current: 370/311
• CPC Class Codes: H04L 1/0004 applied to control information
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 40/005 Routing actions in the presence of nodes in sleep or doze mode
• CPC Class Codes: H04W 52/02 Power saving arrangements in wired systems H04L12/12; signaling of mobile application services, e.g. low battery notifications H04W4/20
• 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 52/0235 where the received signal is a power saving command
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/1273 of downlink data flows
• 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 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Methods of combining semi-persistent resource allocation and dynamic resource allocation are provided. Packets, such as VoIP packets, are transmitted on the uplink and downlink using respective semi-persistent resources. For each mobile device, awake periods and sleep periods are defined. The semi-persistent resources are aligned with the awake periods so that most of the time the mobile device can turn off its wireless access radio during the sleep periods. In addition, signalling to request, and to allocate, resources for additional packets are transmitted during the awake periods, and the resources allocated for the additional packets are within the awake periods. Methods of extending the awake periods in various embodiments are also provided. Methods of determining the first on period are also provided.

Claims

1. A method for operating a base station in a wireless network, the method comprising:

determining, by the base station configured to provide wireless communications to a mobile device configured to operate in a discontinuous reception (DRX) mode, DRX awake periods during each of which the mobile device monitors consecutive downlink layer 1 control channel elements (CCE'"'"'s) within a same DRX awake period, wherein the DRX mode includes DRX sleep periods and DRX awake periods the downlink layer 1 CCE'"'"'s providing signaling of a dynamically allocated resource for the mobile device to communicate data; and

transmitting, by the base station, signaling comprising a DRX control parameter that indicates a start time for a first DRX awake period of said DRX awake periods, wherein the start time defines an initial subframe of the first DRX awake period.

2. The method of claim 1, further comprising:

transmitting, by the base station, signaling comprising a DRX control parameter that indicates an extension period during which the mobile device will continue to monitor downlink layer 1 CCE'"'"'s following one of said DRX awake periods for a dynamic scheduling allocation.

3. The method of claim 1, wherein transmitting the signaling comprises transmitting signaling that indicates the first of said DRX awake periods in relative terms.

4. The method of claim 1, further comprising transmitting, by the base station, a plurality of downlink layer 1 CCE'"'"'s to the mobile device during at least one of the DRX awake periods.

5. The method of claim 1, wherein the base station is part of a Long Term Evolution (LTE) network, and wherein the mobile device is configured to be associated with the LTE network.

6. A method for operating a mobile device to receive wireless communications from a base station, the method comprising:

operating the mobile device in a discontinuous reception (DRX) mode, the DRX mode including DRX sleep periods and DRX awake periods during each of which the mobile device monitors consecutive downlink layer 1 CCE'"'"'s within a same DRX awake period; and

receiving, by the mobile device, signaling comprising a DRX control parameter that indicates a start time for a first DRX awake period of said DRX awake periods, wherein the start time defines an initial subframe of the first DRX awake period.

7. The method of claim 6, further comprising:

receiving, by the mobile device, a DRX control parameter that indicates an extension period during which the mobile device will continue to monitor downlink layer 1 CCE'"'"'s following one of said DRX awake periods for a dynamic scheduling allocation.

8. The method of claim 6, wherein receiving the signaling comprises receiving signaling that indicates the first of said DRX awake periods in relative terms.

9. The method of claim 6, further comprising receiving, by the mobile device, a plurality of downlink layer 1 CCE'"'"'s transmitted during at least one of the DRX awake periods.

10. The method of claim 6, wherein the base station is part of a Long Term Evolution (LTE) network, and wherein the mobile device is configured to be associated with the LTE network.

11. A base station device for communicating with a mobile device in a wireless network, the device comprising:

a discontinuous reception (DRX) controller configured to determine a DRX control parameter for a mobile device, the DRX control parameter indicating DRX awake periods during each of which the mobile device monitors consecutive downlink layer 1 control channel elements (CCE'"'"'s) within a same DRX awake period, the DRX controller being further configured to determine a first of said DRX awake periods;

wherein the mobile device is configured to operate in a DRX mode, which includes DRX sleep periods and DRX awake periods during each of which the mobile device monitors the plurality of downlink layer 1 CCE'"'"'s, the downlink layer 1 CCE'"'"'s providing signaling of a dynamically allocated resource for the mobile device to communicate data; and

a transceiver and at least one antenna configured to establish a wireless link with the mobile device;

wherein the device is configured to transmit signaling to the mobile device to indicate a start time for the first DRX awake period of said DRX awake periods, wherein the start time defines an initial subframe of the first DRX awake period.

12. The device of claim 11, wherein the device is further configured to generate a DRX control parameter that indicates an extension period during which the mobile device will continue to monitor downlink layer 1 CCE'"'"'s following one of said DRX awake periods for a dynamic scheduling allocation.

13. The device of claim 11, wherein the device is further configured to transmit a plurality of downlink layer 1 CCE'"'"'s during at least one of the DRX awake periods.

14. The device of claim 11, wherein the base station device is part of a Long Term Evolution (LTE) network, and wherein the mobile device is configured to be associated with the LTE network.

15. A mobile device comprising:

a radio manager configured to operate in accordance with one or more discontinuous reception (DRX) parameters received from a base station,

wherein the one or more DRX parameters indicate DRX awake periods during which the mobile device monitors consecutive downlink layer 1 control channel elements (CCE'"'"'s) within a same DRX awake period, and indicate a start time for a first DRX awake period of said DRX awake periods, wherein the start time defines an initial subframe of the first DRX awake period,

wherein the mobile device is configured to operate in a DRX mode including DRX sleep periods and DRX awake periods, starting with the first of said DRX awake periods.

16. The device of claim 15, wherein the mobile device is configured to receive a plurality of downlink layer 1 CCE'"'"'s transmitted during at least one of the DRX awake periods.

17. The device of claim 15, wherein the base station is part of a Long Term Evolution (LTE) network, and wherein the mobile device is configured to be associated with the LTE network.

18. A computer program product encoded on a non-transitory medium, the product comprising computer readable instructions for causing one or more processors to perform operations comprising:

determining, by the base station configured to provide wireless communications to a mobile device configured to operate in a discontinuous reception (DRX) mode, DRX awake periods during each of which the mobile device monitors consecutive downlink layer 1 control channel elements (CCE'"'"'s) within a same DRX awake period, wherein the DRX mode includes DRX sleep periods and DRX awake periods the downlink layer 1 CCE'"'"'s providing signaling of a dynamically allocated resource for the mobile device to communicate data; and

transmitting, by the base station, signaling comprising a DRX control parameter that indicates a start time for a first DRX awake period of said DRX awake periods, wherein the start time defines an initial subframe of the first DRX awake period.

19. The computer program product of claim 18, the operations further comprising:

transmitting, by the base station, signaling comprising a DRX control parameter that indicates an extension period during which the mobile device will continue to monitor downlink layer 1 CCE'"'"'s following one of said DRX awake periods for a dynamic scheduling allocation.

20. The computer program product of claim 18, wherein transmitting the signaling comprises transmitting signaling that indicates the first of said DRX awake periods in relative terms.

21. A computer program product encoded on a non-transitory medium, the product comprising computer readable instructions for causing one or more processors to perform operations comprising:

operating the mobile device in a discontinuous reception (DRX) mode, the DRX mode including DRX sleep periods and DRX awake periods during each of which the mobile device monitors consecutive downlink layer 1 CCE'"'"'s within a same DRX awake period; and

receiving, by the mobile device, signaling comprising a DRX control parameter that indicates a start time for a first DRX awake period of said DRX awake periods, wherein the start time defines an initial subframe of the first DRX awake period.

22. The computer program product of claim 21, the operations further comprising:

receiving, by the mobile device, a DRX control parameter that indicates an extension period during which the mobile device will continue to monitor downlink layer 1 CCE'"'"'s following one of said DRX awake periods for a dynamic scheduling allocation.

23. The computer program product of claim 21, wherein receiving the signaling comprises receiving signaling that indicates the first of said DRX awake periods in relative terms.