Method and apparatus for performing discontinuous reception and downlink inter-frequency and inter-radio access technology measurements in CELL_FACH state

Patent metadata

Field	Value
Publication number	US-10560852-B2
Application number	US-201715709040-A
Country	US
Kind code	B2
Filing date	Sep 19, 2017
Priority date	Jan 31, 2008
Publication date	Feb 11, 2020
Grant date	Feb 11, 2020

Abstract

A method and apparatus of performing discontinuous reception (DRX) and downlink inter-frequency and inter-radio access technology (RAT) measurements in CELL_FACH state are disclosed. While in DRX mode, a wireless transmit/receive unite (WTRU) may perform inter-frequency and inter-RAT measurements in a measurement occasion that fall into a DRX period. The WTRU may take the measurements on first predetermined number of frame in which a DRX frame would coincide after a last reception frame if DRX operation was ongoing. The WTRU may periodically wake up for downlink reception in CELL_FACH state in accordance with common DRX pattern that is common to all WTRUs in a cell or may wake up from DRX upon reception of the order and receiving a common traffic.

First claim

What is claimed is:

1. A method to determine a measurement action associated with a CELL_FACH state by a wireless transmit/receive unit (WTRU), the method comprising:
determining whether DRX operation is configured in a CELL_FACH state;
performing, via the wireless transmit/receive unit (WTRU), at least one of an inter-frequency measurement or an inter-RAT measurement in accordance with a first measurement time when it is determined that DRX operation is configured; and
performing, via the wireless transmit/receive unit (WTRU), at least one of an inter-frequency measurement or an inter-RAT measurement in accordance with a second measurement time when it is determined that DRX operation is not configured.

2. The method of claim 1 , wherein the first measurement time is a frame with an SFN value that fulfills the following: (SFN-H_RNTI) mod DRX_cycle<Rx_burst.

3. The method of claim 1 , wherein the second measurement time is provided in a FACH measurement occasion info information element.

4. The method of claim 1 , further comprising:
determining whether a quality measure is below a threshold; and
performing one of the measurements when the quality measure falls below the threshold.

5. The method of claim 4 , wherein the threshold is equivalent to parameter Sintersearch broadcast in system information.

6. The method of claim 4 , wherein the quality measure relates to at least one of a cell in a same frequency or a cell in a different frequency.

7. The method of claim 4 , wherein the threshold is equivalent to parameter SsearchRAT broadcast in system information.

8. The method of claim 1 , wherein the first measurement time is during a DRX period.

9. The method of claim 1 , wherein the second measurement time is during a FACH measurement occasion.

10. A wireless transmit/receive unit (WTRU) configured to determine a measurement action associated with a CELL_FACH state, the WTRU comprising:
a processor configured to:
determine whether DRX operation is configured in a CELL_FACH state; and
a receiver configured to:
perform at least one of an inter-frequency measurement or an inter-RAT measurement in accordance with a first measurement time when it is determined that DRX operation is configured; and
perform at least one of an inter-frequency measurement or an inter-RAT measurement in accordance with a second measurement time when it is determined that DRX operation is not configured.

11. The WTRU of claim 10 , wherein the first measurement time is a frame with an SFN value that fulfills the following: (SFN-H_RNTI) mod DRX_cycle<Rx_burst.

12. The WTRU of claim 10 , wherein the second measurement time is provided in a FACH measurement occasion info information element.

13. The WTRU of claim 10 , wherein:
the processor is further configured to determine whether a quality measure is below a threshold; and
the receiver is further configured to perform one of the measurements when the quality measure falls below the threshold.

14. The WTRU of claim 13 , wherein the threshold is equivalent to parameter Sintersearch broadcast in system information.

15. The WTRU of claim 13 , wherein the quality measure relates to at least one of a cell in a same frequency or a cell in a different frequency.

16. The WTRU of claim 13 , wherein the threshold is equivalent to parameter SsearchRAT broadcast in system information.

17. The WTRU of claim 10 , wherein the first measurement time is during a DRX period.

18. The WTRU of claim 10 , wherein the second measurement time is during a. EACH measurement occasion.

Assignees

• Interdigital Patent Holdings Inc

Inventors

• Di Girolamo Rocco
• Pani Diana
• Cave Christopher R
• Marinier Paul
• Roy Vincent

Classifications

• H04W24/00 Primary

  Supervisory, monitoring or testing arrangements · CPC title

• H04W36/0088

  Scheduling hand-off measurements · CPC title

• H04L43/16

  Threshold monitoring · CPC title

• H04L43/00 Primary

  Arrangements for monitoring or testing data switching networks · CPC title

• H04W36/14

  Reselecting a network or an air interface · CPC title