System and method for discontinuous reception control start time

• US 8,711,745 B2
• Filed: 12/17/2007
• Issued: 04/29/2014
• 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:
  US11/957,624
• Publication Number:
  US 20090073907A1
• Time in Patent Office: 2,325 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 a network to provide wireless communications to a mobile device, the method comprising:

determining, by the network configured to provide wireless communications to the mobile device operating in a discontinuous reception (DRX) control mode, DRX awake periods of the DRX control mode, wherein during each DRX awake period the mobile device monitors, for a dynamically-allocated resource, a plurality of downlink layer 1 control channel elements (CCE'"'"'s) in each of a plurality of consecutive sub-frames of that DRX awake period, wherein the DRX control mode includes DRX sleep periods, and DRX awake periods;

transmitting, by the network, signaling comprising a DRX control parameter that indicates a first of said DRX awake periods; and

transmitting, by the network, a plurality of downlink layer 1 CCE'"'"'s to the mobile device during at least the first of said DRX awake periods.

2. The method of claim 1 further comprising:

transmitting, by the network, signaling comprising a DRX control parameter that indicates an extension period during which the mobile device will continue to monitor a plurality of 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 signaling by the network comprises transmitting signaling that indicates the first of said DRX awake periods in absolute terms.

4. The method of claim 3 wherein transmitting signaling that indicates the first of said DRX awake periods in absolute terms comprises transmitting signaling that indicates a layer-1 sub-frame index.

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

6. The method of claim 5 wherein transmitting signaling that indicates the first of said DRX awake periods in relative terms comprises transmitting signaling that indicates an activation timer duration.

7. The method of claim 6 wherein transmitting the activation timer duration comprises at least one of:

transmitting the activation timer duration in units of layer-1 sub-frames; and

transmitting the activation timer duration in units of actual time.

8. The method of claim 1, wherein the network comprises an eNB of a Long Term Evolution (LTE) network.

9. The method of claim 1, wherein the downlink layer 1 CCE'"'"'s include information indicative of dynamic scheduling grants.

10. A method for a mobile device to receive wireless communications from a network, the method comprising:

receiving, by a mobile device operating in a discontinuous reception (DRX) control mode in which the mobile device has DRX sleep periods and DRX awake periods, signaling comprising a DRX control parameter that indicates a first of said DRX awake periods; and

monitoring, for a dynamically-allocated resource during each of the DRX awake periods, a plurality of downlink layer 1 control channel elements (CCE'"'"'s) in each of a plurality of consecutive sub-frames of that DRX awake period.

11. The method of claim 10 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 a plurality of layer 1 CCE'"'"'s following one of said DRX awake periods for a dynamic scheduling allocation.

12. The method of claim 10 wherein receiving signaling by the mobile device comprises receiving signaling that indicates the first of said DRX awake periods in absolute terms.

13. The method of claim 12 wherein receiving signaling that indicates the first of said DRX awake periods in absolute terms comprises receiving signaling that indicates a layer-1 sub-frame index.

14. The method of claim 10 wherein receiving signaling by the mobile device comprises receiving signaling that indicates the first of said DRX awake periods in relative terms.

15. The method of claim 14 wherein receiving signaling that indicates the first of said DRX awake periods in relative terms comprises receiving signaling that indicates an activation timer duration.

16. The method of claim 15 wherein receiving signaling by the mobile device the activation timer duration comprises at least one of:

receiving the activation timer duration in units of layer-1 sub-frames; and

receiving the activation timer duration in units of actual time.

17. The method of claim 10, wherein the mobile device is a user equipment (UE) of a Long Term Evolution (LTE) network.

18. The method of claim 10, wherein the downlink layer 1 CCE'"'"'s include information indicative of dynamic scheduling grants.

19. An apparatus for providing communications services to a mobile device, the apparatus comprising:

a discontinuous reception (DRX) controller configured to determine DRX control parameters for the mobile device configured to operate in a DRX control mode,

wherein the DRX control mode includes DRX sleep periods, and DRX awake periods,

wherein the DRX control parameters indicate DRX awake periods, wherein during each DRX awake period the mobile device monitors, for a dynamically-allocated resource, a plurality of downlink layer 1 control channel elements (CCE'"'"'s) in each of a plurality of consecutive sub-frames of that DRX awake period,

wherein the DRX controller is further configured to determine a first of said DRX awake periods during which the mobile device monitors downlink layer 1 CCE'"'"'s; and

a transceiver and at least one antenna for establishing a wireless link with the mobile device, the transceiver being configured to transmit the DRX control parameters to the mobile device and to transmit to the mobile device in accordance with the DRX control parameters starting with the first of said DRX awake periods;

wherein the transceiver is configured to transmit signaling to the mobile device that indicates the first of said DRX awake periods, and

wherein the transceiver is further configured to transmit a plurality of downlink layer 1 CCE'"'"'s during at least the first of said DRX awake periods.

20. The apparatus of claim 19 wherein the DRX controller generates DRX control parameters that further indicate an extension period during which the mobile device will continue to monitor downlink a plurality of layer 1 CCE'"'"'s following one of said DRX awake periods for a dynamic scheduling allocation.

21. The apparatus of claim 19, wherein the apparatus is an eNB of a Long Term Evolution (LTE) network.

22. The apparatus of claim 19, wherein the downlink layer 1 CCE'"'"'s include information indicative of dynamic scheduling grants.

23. A mobile device comprising:

a wireless access radio for receiving wireless communications from a network;

a radio manager configured to control when the wireless access radio is on and when the wireless access radio is off;

wherein the radio manager is further configured to perform the control of the wireless access radio in accordance with discontinuous reception (DRX) control parameters received from the network via the wireless access radio, the DRX control parameters indicating DRX awake periods during each of which the mobile device monitors, for a dynamically-allocated resource, a plurality of downlink layer 1 control channel elements (CCE'"'"'s) in each of a plurality of consecutive sub-frames of that DRX awake period and indicating a first of said DRX awake periods;

wherein the mobile device is configured to operate in a DRX mode in which the mobile device has DRX sleep periods and DRX awake periods; and

wherein the mobile device is configured to receive a plurality of downlink layer 1 CCE'"'"'s transmitted during at least the first of said DRX awake periods.

24. The mobile device of claim 23, wherein the mobile device is a user equipment (UE) of a Long Term Evolution (LTE) network.

25. The mobile device of claim 23, wherein the downlink layer 1 CCE'"'"'s include information indicative of dynamic scheduling grants.