User equipment having improved power savings during full and partial DTX modes of operation

• US 20030086379A1
• Filed: 10/17/2002
• Published: 05/08/2003
• Est. Priority Date: 10/19/2001
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Terry, Stephen E., DiFazio, Robert A.
• Granted Patent: US 6,967,970 B2
• Time in Patent Office: Days
• US Class Current: 370/279
• CPC Class Codes: H04W 52/0238 where the received signal is an unwanted signal, e.g. interference or idle signal
• CPC Class Codes: H04W 52/028 switching on or off only a part of the equipment circuit blocks
• CPC Class Codes: H04W 52/44 in connection with interruption of transmission
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/20 Manipulation of established connections
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The present invention achieves power savings by turning off all or some of the baseband processing for codes and timeslots that have not been transmitted due to full or partial DTX. With respect to partial DTX, the transmitted codes and associated timeslots and radio frames within the shortest TTI in the CCTrCH are determined from the received TFCI. Thereafter, the receiver is turned off for the unused codes as indicated by the received TFCI. With respect to full DTX, following TFCI reception, the receiver is turned off for all timeslots within the shortest TTI.

Claims

1. A method for saving power during discontinuous transmission (DTX) of a TDD receiver;

comprising;

receiving a TFCI for a coded composite transport channel (CCTrCH), the CCTrCH having a plurality of transport channels (TrCHs), each TrCH comprising at least one code and timeslot and having an associated TTI comprising at least one radio frame;

determining from the received TFCI transmitted codes, timeslots and radio frames within the shortest TTI in the CCTrCH;

turning off receiver processing for codes and timeslots that are not transmitted within said shortest TTI.

2. The method of claim 1 further comprising turning on receiver processing at a first allocated timeslot after said TTI.

3. The method of claim 1 wherein said DTX is partial DTX.

4. The method of claim 1 wherein said DTX is full DTX.

5. A method for saving power during discontinuous transmission (DTX) of a TDD receiver;

comprising;

receiving a TFCI for a coded composite transport channel (CCTrCH), the CCTrCH having a plurality of transport channels (TrCHs);

determining from the received TFCI the active TrCHs;

turning off receiver processing for all inactive TrCHs.

6. The method of claim 5 further comprising turning on receiver processing after a predetermined duration.

7. The method of claim 6 wherein said predetermined duration is the shortest TTI within the CCTrCH.

8. The method of claim 5 wherein said DTX is partial DTX.

9. The method of claim 5 wherein said DTX is full DTX.

10. A method for saving power during discontinuous transmission (DTX) of a TDD receiver;

comprising;

receiving a TFCI for a coded composite transport channel (CCTrCH), the CCTrCH having a plurality of codes and timeslots;

determining from the received TFCI, transmitted codes and timeslots;

turning off the receiver for all inactive codes and timeslots that are not transmitted.

11. The method of claim 10 wherein said DTX is partial DTX.

12. The method of claim 10 wherein said DTX is full DTX.

13. The method of claim 10 further comprising turning on receiver processing after a predetermined duration.

14. The method of claim 13 wherein said predetermined duration is the shortest TTI within the CCTrCH.

15. A method for saving power during discontinuous transmission (DTX) of a TDD receiver;

comprising;

receiving a TFCI for a coded composite transport channel (CCTrCH), the CCTrCH having a plurality of transport channels (TrCHs), each TrCH comprising at least one code and timeslot and having an associated TTI comprising at least one radio frame;

identifying the shortest TTI within the CCTrCH;

determining from the received TFCI, all codes and timeslots that will not be used during said TTI;

turning off receiver processing for all codes and timeslots that will not be used during said TTI.

16. The method of claim 15 wherein said DTX is partial DTX.

17. The method of claim 15 wherein said DTX is full DTX.

18. The method of claim 15 further comprising turning on receiver processing after a predetermined duration.

19. The method of claim 15 wherein said predetermined duration is said TTI.

20. A method for saving power during discontinuous transmission (DTX) of a TDD receiver;

comprising;

receiving a TFCI for a coded composite transport channel (CCTrCH), the CCTrCH having a plurality of transport channels (TrCHs), each TrCH comprising at least one code and timeslot and having an associated TTI comprising at least one radio frame;

determining the shortest TTI within the CCTrCH;

identifying the received TFCI as a special burst;

whereby if it is not a special burst, processing returns to the receiving step;

deactivating receiver processing for all codes and timeslots during said TTI following the receiving of the TFCI;

activating receiver processing at the first allocated timeslot after said TTI;

attempting to read a valid TFCI in said timeslot;

whereas if a valid TFCI has been received, processing returns to the identifying step, and if a valid TFCI has not been received, processing returns to the deactivating step.

21. A method for saving power during discontinuous transmission (DTX) of a TDD receiver;

comprising;

receiving a TFCI for a coded composite transport channel (CCTrCH), the CCTrCH having a plurality of transport channels (TrCHs), each TrCH comprising a plurality of codes and timeslots;

determining the shortest TTI within the CCTrCH;

identifying the received TFCI as a special burst;

whereby if it is not a special burst, processing returns to the receiving step;

deactivating receiver processing for all codes and timeslots following the receiving of the TFCI;

activating receiver processing after a predetermined duration;

attempting to read a valid TFCI in said timeslot;

whereas if a valid TFCI has been received, processing returns to the identifying step, and if a valid TFCI has not been received, processing returns to the deactivating step.

22. The method of claim 21 wherein said predetermined duration is said shortest TTI.

23. A method for saving power during discontinuous transmission (DTX) of a TDD receiver;

comprising;

receiving a TFCI for a coded composite transport channel (CCTrCH), the CCTrCH having a plurality of transport channels (TrCHs);

determining the shortest TTI within the CCTrCH;

identifying the received TFCI as a special burst;

whereby if it is not a special burst, processing returns to the receiving step;

deactivating receiver processing for all TrCHs in said TTI;

activating receiver processing at the first allocated timeslot after said TTI;

attempting to read a valid TFCI in said timeslot;

whereas if a valid TFCI has been received, processing returns to the identifying step, and if a valid TFCI has not been received, processing returns to the deactivating step.

24. A method for saving power during discontinuous transmission (DTX) of a TDD receiver;

comprising;

a) receiving a TFCI for a coded composite transport channel (CCTrCH), the CCTrCH having a plurality of transport channels (TrCHs), each TrCH comprising at least one code and timeslot and having an associated TTI comprising at least one radio frame;

b) identifying the shortest TTI within the CCTrCH;

c) detecting the received TFCI as a special burst, whereas if it is a special burst, proceeding to step f and if it is not a special burst, proceeding to step d;

d) determining whether all codes and timeslots will be used during said TTI and, if so, returning to step a, whereas, if not, proceeding to step e;

e) selectively deactivating receiver processing for all codes and timeslots that will not be used during said TTI, and returning to said identifying step;

f) deactivating receiver processing for all codes and timeslots during said TTI;

g) activating receiver processing at the first allocated timeslot after said TTI;

h) attempting to read a valid TFCI in said timeslot;

whereas if a valid TFCI has been received, processing returns to step c, and if a valid TFCI has not been received, processing returns to step f.

25. A method for saving power during discontinuous transmission (DTX) of a TDD receiver;

comprising;

a) receiving a TFCI for a coded composite transport channel (CCTrCH), the CCTrCH having a plurality of transport channels (TrCHs), each TrCH comprising a plurality of codes and timeslots;

b) detecting the received TFCI as a special burst, whereas if it is a special burst, proceeding to step e and if it is not a special burst, proceeding to step c;

c) determining whether all codes and timeslots will be used and, if so, returning to step a, whereas, if not, proceeding to step d;

d) selectively deactivating receiver processing, for a first predetermined duration, for all codes and timeslots that will not be used, and returning to step a;

e) deactivating receiver processing for all codes and timeslots following the receiving of the TFCI;

f) activating receiver processing after a second predetermined duration;

g) attempting to read a valid TFCI in said timeslot;

whereas if a valid TFCI has been received, processing returns to step b, and if a valid TFCI has not been received, processing returns to step e.

26. The method of claim 25 wherein each TrCH has an associated TTI, the method further comprising identifying the shortest TTI within the CCTrCH;

27. The method of claim 26 wherein said first predetermined duration is said shortest TTI.

28. The method of claim 26 wherein said second predetermined duration is said shortest TTI.

29. The method of claim 26 wherein both said first and second predetermined durations are said shortest TTI.

30. A system for saving power during discontinuous transmission (DTX) of a TDD receiver;

comprising;

a preprocessing unit for determining whether a received signal includes a valid TFCI;

a detection unit for reading the valid TFCI to determine all active and inactive codes and timeslots;

a receiver control unit for turning off receiver processing for all codes and timeslots that will not be used.

31. The system of claim 30, wherein said preprocessing unit further comprises:

a code power estimation unit for estimating the power of the received signal.

32. The system of claim 31, wherein said preprocessing unit further comprises a burst quality estimation unit for estimating the quality of the received signal.

33. The system of claim 30, wherein said detection unit further comprises a fast TFCI interpretation unit for reading said valid TFCI and identifying the active and inactive codes and timeslots.

34. The system of claim 33, wherein said detection unit further comprises a special burst detection unit for reading said valid TFCI and identifying whether it is a special burst indicating full DTX.