System and Method for Retransmissions in a Discontinuous Reception Configured System

• US 20090052367A1
• Filed: 08/19/2008
• Published: 02/26/2009
• Est. Priority Date: 08/20/2007
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Inventors: Womack, James Earl, Cai, Zhijun
• Granted Patent: US 8,265,080 B2
• Time in Patent Office: Days
• US Class Current: 370/315
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 40/005 Routing actions in the presence of nodes in sleep or doze mode
• CPC Class Codes: H04W 52/0209 in terminal devices terminal devices per se H04W88/02
• CPC Class Codes: H04W 76/20 Manipulation of established connections
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Methods of performing retransmissions in respect of communications, uplink and/or downlink, on semi-persistent resources are provided. Various embodiments include: the mobile device keeps its radio on for an additional period immediately following an awake period upon determining there will be a retransmission; the mobile device turning its radio on for an additional period separate and distinct from the awake period.

Claims

1. A method in a wireless device comprising:

configuring the device for discontinuous reception (DRX) having on durations;

receiving a first transmission during an on duration;

if the first transmission was not successfully received sending a negative acknowledgement (NACK) and entering an additional on-duration based upon a hybrid automatic repeat request (HARQ) round-trip time (RTT).

2. The method of claim 1 further comprising:

monitoring for dynamic allocations during the additional on-duration.

3. The method of claim 1, wherein entering an additional on-duration comprises:

starting a timer to determine the start of the additional on-duration; and

wherein the on-duration includes a time that the timer is running.

4. A wireless device comprising:

a radio configured for discontinuous reception (DRX) having on durations;

the radio further configured to receive a first transmission during an on duration; and

a radio manager configured to command the radio to enter an additional on-duration based upon a hybrid automatic repeat request (HARQ) round-trip time (RTT) if the first transmission was not successfully received.

5. The wireless device of claim 4, wherein the device is further configured to monitor for dynamic allocations during the additional on-duration.

6. The wireless device of claim 4 further comprising a timer, wherein the timer is started to determine the start of the additional on-duration, and wherein the radio manager is further configured to command the radio to an on duration while the timer is running.

7. A method in a wireless device comprising:

controlling at least one of a transmitter and a receiver to have on periods of nominal on duration during which at least one of the transmitter and the receiver is on;

communicating during at least one of the periods of nominal on duration;

controlling at least one of the transmitter and receiver to be on for an additional on period upon determining there will be a retransmission in respect of a communication during one of said on periods of nominal on duration.

8. The method of claim 7 further comprising:

receiving signaling that defines the nominal on duration.

9. The method of claim 7 further comprising:

monitoring for dynamic allocations during the additional period.

10. The method of claim 7 wherein:

controlling at least one of the transmitter and the receiver to be on for an additional on period comprises controlling at least one of the transmitter and the receiver to be on immediately following an on period of nominal on duration during which a communication took place.

11. The method of claim 10 wherein controlling at least one of the transmitter and the receiver to be on for an additional period comprises:

starting a timer after determining there will be a retransmission;

keeping at least one of the transmitter and the receiver on while the timer is running notwithstanding the nominal on duration.

12. The method of claim 11 further comprising:

monitoring for dynamic allocations while the timer is running.

13. The method of claim 7 wherein controlling at least one of the transmitter and receiver to have on periods of nominal on duration comprises controlling at least the receiver to have on periods of nominal on duration.

14. The method of claim 13 wherein:

communication comprises, during one of said on periods of nominal on duration, receiving a communication;

controlling at least one of the transmitter and the receiver to be on for an additional on period upon determining there will be a retransmission comprises;

determining if the communication was not successful;

if the communication was not successful, controlling at least the receiver to be on for the additional on period to allow for the retransmission in respect of the communication that was not successful.

15. The method of claim 14 wherein controlling at least the receiver to be on for the additional on period to allow for the retransmission in respect of the communication that was not successful comprises controlling at least the receiver to be on while a timer is running;

the method further comprising starting the timer after determining the communication was not successfully received.

16. The method of claim 15 further comprising:

transmitting a negative acknowledgement if the communication was not successfully received;

starting the timer is triggered by negative acknowledgement transmission.

17. A computer readable medium having computer readable instructions stored thereon that when executed by a wireless device having a transmitter and a receiver implement a method comprising:

controlling at least one of the transmitter and the receiver to have on periods of nominal on duration during which at least one of the transmitter and the receiver is on;

controlling at least one of the transmitter and receiver to be on for an additional on period upon determining there will be a retransmission.

18. A method in a wireless network for communicating with a mobile device, the method comprising:

transmitting signaling that defines on periods each having a nominal on duration, such that the mobile device will be expected to have at least one of a receiver and transmitter in the mobile device on for every on period; and

transmitting signaling that defines additional on periods for the mobile device for retransmissions, such that the mobile device will be expected to have the at least one of the receiver and transmitter on for each additional on period for which a retransmission is expected.

19. The method of claim 18 wherein:

transmitting signaling that defines additional on periods comprises transmitting an inactivity timer duration.

20. The method of claim 18 wherein:

transmitting signaling that defines additional on periods comprises transmitting signaling that defines at least one of the additional on periods to be immediately following a respective one of the periods of nominal on duration.

21. The method of claim 20 wherein:

transmitting signaling that defines additional on periods comprises transmitting signaling that defines at least one of the additional on periods such that there is a gap between the end of a respective one of the periods of nominal on duration and the additional on period.

22. A computer readable medium having computer readable instructions stored thereon that when executed by a wireless network control the network to implement a method for communicating with a mobile device, the method comprising:

transmitting signaling that defines on periods each having a nominal on duration, such that the mobile device will be expected to have at least one of a receiver and transmitter in the mobile device on for every on period; and

transmitting signaling that defines additional on periods for the mobile device for retransmissions, such that the mobile device will be expected to have at least one of the receiver and transmitter of the radio on for each additional on period for which a retransmission is expected.

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

a discontinuous reception controller that determines discontinuous reception control parameters for a mobile device, the discontinuous reception control parameters indicating on periods during which the mobile device will nominally have at least one of a transmitter and receiver in the mobile device powered on, the discontinuous reception control parameters further indicating additional on periods during which the mobile device will have at least one of the transmitter and receiver powered on for the purpose of retransmission in the event a retransmission is expected;

a transceiver and at least one antenna for establishing a wireless link with the mobile device, the transceiver being used to transmit the discontinuous reception control parameters to the mobile device and to communicate with the mobile device in accordance with the discontinuous reception control parameters.

24. A mobile device comprising:

a wireless access radio for sending and receiving wireless communications to and from a network;

a radio manager that controls when the wireless access radio is on and when the wireless access radio is off;

the radio manager configured to perform control of the wireless access radio in accordance with discontinuous reception control parameters received from the network via the wireless access radio, the discontinuous reception control parameters indicating on periods of nominal on duration during which the wireless access radio will nominally be powered on;

the radio manager further configured to control the wireless access radio to be on for an additional on period upon determining a retransmission is expected.

25. The mobile device of claim 24 wherein the wireless device is configured to communicate during the on periods of nominal on duration using a semi-persistent resource by receiving downlink transmissions using a downlink semi-persistent resource.

26. The mobile device of claim 24 wherein the wireless device is configured to communicate during the on periods of nominal on duration using a semi-persistent resource by transmitting uplink transmissions using an uplink semi-persistent resource.