Granted Patent B2

US 8,571,091 · App. 12/811,624 · Granted Oct 29, 2013

Inventors: Lars Dalsgaard (Oulu, FI); Frank Frederiksen (Klarup, DK); Troels Emil Kolding (Klarup, DK); Klaus Ingemann Pedersen (Aalborg, DK)

Assignee: Nokia Siemens Networks Oy

Abstract

Claims (71)

1. A method, comprising:

selectively receiving packets in a half duplex transceiver from a downlink in a downlink window having a predetermined number M of downlink sub frames;

shifting to a transmit mode in a sub frame;

selectively transmitting packets from the half duplex transceiver on an uplink in an uplink window having a predetermined number N of sub frames;

shifting to a receive mode in a sub frame;

repeating the selectively receiving, shifting to a transmit mode, selectively transmitting, shifting, in a continuous cycle of sub frames and frames comprised of multiple sub frames;

entering a discontinuous reception mode where power is conserved by reducing power to the transceiver for a predetermined number of discontinuous reception sub frames;

detecting an end to the predetermined number of discontinuous reception sub frames;

determining whether the present time coincides with an uplink sub frame;

if the determining is negative, exiting the discontinuous reception mode and receiving a packet data control channel message; and

if the determining is positive, remaining in the discontinuous reception mode for an additional M+1 sub frames and then exiting the discontinuous reception mode in a downlink sub frame and receiving a packet data control channel message.

2. The method of claim 1 and further comprising,

at the end of the discontinuous reception mode:

setting an on duration timer to a predetermined number of sub frames;

determining if the next sub frame is within a downlink window;

responsive to a positive determining, selectively decrementing the on duration timer and receiving another sub frame from the downlink; and

repeating the determining and decrementing to the end of the downlink window.

3. The method of claim 2 and further comprising:

responsive to a negative determining, maintaining the on duration timer.

4. The method of claim 3 and further comprising:

determining within a downlink window that the on duration timer is complete; and

returning to the discontinuous reception mode and reducing power to the transceiver circuit until the predetermined number of sub frames has elapsed.

5. The method of claim 1 and further comprising:

detecting a resource allocation in the packet data control channel;

setting an inactivity timer; and

determining whether the next sub frame is within the downlink window;

if the determining is positive, decrementing the inactivity timer and receiving packets on the downlink; and

repeating the determining and if the determining is positive, decrementing until the end of the downlink window.

6. The method of claim 5 and further comprising:

if the determining is negative, detecting whether the inactivity timer has expired; and

if the inactivity timer has not expired, remaining active until the next downlink window in the cycle.

7. The method of claim 1 , wherein M and N is each an integer greater than or equal to 1.

8. The method of claim 1 , wherein M and N are equal.

9. The method of claim 1 , wherein M and N are equal integers and equal to 3.

10. The method of claim 9 , wherein determining whether at the present time the sub frame is an uplink sub frame comprises determining the remainder of the modulo operation on the ratio of the present sub frame number and the integer ((3+1)*2).

11. The method of claim 10 , wherein if the remainder is not less than 3, the sub frame is an uplink sub frame.

12. The method of claim 7 , wherein M and N are equal integers and determining whether at the present time the sub frame is an uplink sub frame comprises determining the remainder of the modulo operation on the ratio of the present sub frame number and the integer ((M+1)*2).

13. An apparatus, comprising:

a half duplex receiver for selectively receiving radio frequency downlink signals on a downlink during a number of downlink sub frames M;

a half duplex transmitter for selectively transmitting radio frequency uplink signals on an uplink during N UL sub frames;

a discontinuous reception function for periodically reducing power to the half duplex receiver and half duplex transmitter for a predetermined number of discontinuous reception sub frames;

a half duplex cycle function for performing a predetermined half duplex cycle in the half duplex receiver and in the half duplex transmitter selectively receiving a number of sub frames M from the downlink, shifting to a transmit mode, selectively transmitting a number of sub frames N on the uplink, shifting to a receive mode, and continuously repeating the receiving, shifting to a transmit mode, transmitting and shifting to a receive mode;

a discontinuous reception delay function for determining, at the end of the discontinuous reception sub frames, if the half duplex receiver is presently receiving downlink sub frames; and

a discontinuous reception extender function coupled to the discontinuous reception delay function for, when determining the receiver is not presently receiving downlink sub frames, extending the discontinuous reception sub frames by a predetermined number of sub frames until the receiver is receiving downlink sub frames.

14. The apparatus of claim 13 , wherein the discontinuous reception delay function further comprises circuitry for performing an algorithm for determining whether the present sub frame is a downlink sub frame performing a modulo operation on the sub frame number and the quantity ((M+1)*2), and then evaluating the remainder to determine if the remainder is less than M, and M and N are equal integers.

15. The apparatus of claim 13 and further comprising:

a packet data control channel receiver for receiving PDCCH signals on the downlink and for detecting when resources are allocated by the PDCCH; and

a packet data control channel handler for managing downlink and uplink signals in later sub frames responsive to the PDCCH receiver.

16. The apparatus of claim 15 , and further comprising:

an on duration timing function for keeping the half duplex receiver active for a number of on duration sub frames following the end of a discontinuous reception sub frame period.

17. The apparatus of claim 15 , and further comprising:

an inactivity timing function for keeping the half duplex receiver active for a number of inactivity sub frames following receiving a packet data control channel signal allocating resources.

18. The apparatus of claim 17 , wherein the inactivity timing function enables the discontinuous reception at the end of the inactivity sub frames.

19. A system comprising:

one or more base stations for sending and receiving radio frequency signals;

one or more full duplex user equipment radio frequency transceivers selectively connected to at least one of the base stations;

at least one half duplex user equipment radio frequency transceiver selectively connected to at least one of the base stations, each half duplex user equipment radio frequency transceiver further comprising:

a half duplex receiver for selectively receiving radio frequency downlink signals on a downlink during a number of downlink sub frames M;

a half duplex transmitter for selectively transmitting radio frequency uplink signals on an uplink during N uplink sub frames;

a discontinuous reception function for periodically reducing power to the half duplex receiver and half duplex transmitter for a predetermined number of discontinuous reception sub frames;

a half duplex cycle function for performing a predetermined half duplex cycle in the half duplex receiver and in the half duplex transmitter selectively receiving a number of sub frames M from the DL, shifting to a transmit mode, selectively transmitting a number of sub frames N on the uplink, shifting to a receive mode, and continuously repeating the receiving, shifting to a transmit mode, transmitting and shifting to a receive mode;

a discontinuous reception delay function for determining, at the end of the discontinuous reception sub frames, if the half duplex receiver is presently receiving DL sub frames; and

a discontinuous reception extender function coupled to the discontinuous reception delay function for, when determining the receiver is not presently receiving downlink sub frames, extending the discontinuous reception sub frames by a predetermined number of sub frames until the receiver is receiving downlink sub frames.

20. An apparatus comprising:

one or more processors; and

one or memories storing computer program code,

wherein the one or more memories storing the computer program code are configured, with the one or more processors, to cause the apparatus to at least:

cause periodic reduction of power to a half duplex receiver and a half duplex transmitter for a predetermined number of discontinuous reception sub frames, wherein the half duplex receiver is configured to selectively receive radio frequency downlink signals on a downlink during a number of downlink sub frames M, and wherein the half duplex transmitter is configured to selectively transmit radio frequency uplink signals in an uplink during N uplink sub frames;

cause performance of a predetermined half duplex cycle in the half duplex receiver and in the half duplex transmitter, wherein the cycle comprises selectively receiving a number of sub frames M from the downlink, shifting to a transmit node, selectively transmitting a number of sub frames N on the uplink, and continuously repeating the receiving, shifting to a transmit mode, transmitting, and shifting to a receive mode;

determine, at the end of the discontinuous reception sub frames, if the half duplex receiver is currently receiving downlink sub frames; and

in response to determining that the half duplex receiver is not presently receiving downlink sub frames, extending the discontinuous reception sub frames by a predetermined number of sub frames until the half duplex receiver is receiving downlink sub frames.

Assignments (13)

Continuity (1)