System enhancements for using extended drx

Patent metadata

Field	Value
Publication number	US-2016295504-A1
Application number	US-201615088895-A
Country	US
Kind code	A1
Filing date	Apr 1, 2016
Priority date	Apr 3, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

Methods and apparatus may be used for selecting power saving mechanisms in a wireless transmit/receive unit (WTRU). For example, a WTRU may support at least power saving mode (PSM) and/or extended discontinuous reception (eDRX) mode. The WTRU may send a request message including parameters associated with the supported power saving mechanisms, such as an active time for PSM and a preferred DRX value for eDRX mode. The WTRU may receive an accept message including at least one selected parameter indicating the power saving mechanism for the WTRU selected by the network (NW). The WTRU may activate the selected power saving mechanism, and may start a validity timer to define the duration of use of the selected power saving mechanism. In another example, a WTRU configured to use eDRX may receive paging signals for system information (SI) change over a prolonged Broadcast Control Channel (BCCH) modification period.

First claim

What is claimed is:

1 . A wireless transmit/receive unit (WTRU) configured to select a power saving mechanism comprising:
a transmitter configured to send a request message, wherein the request message includes a plurality of parameters associated with plurality of power saving mechanisms supported by the WTRU; a receiver configured to receive, from a mobility management entity (MME), an accept message from a including at least one selected parameter associated with at least one selected power saving mechanism, wherein the at least one selected power saving mechanism is from the plurality of power saving mechanisms supported by the WTRU; and a processor configured to activate the at least one selected power saving mechanism.

2 . The WTRU of claim 1 , wherein the plurality of power saving mechanisms include at least power saving mode (PSM) and extended discontinuous reception (eDRX) mode.

3 . The WTRU of claim 2 , wherein a parameter associated with PSM is an active time and a parameter associated with eDRX mode is a preferred discontinuous reception (DRX) value.

4 . The WTRU of claim 1 , wherein the accept message further includes at least one validity timer value associated with the at least one selected power saving mechanism, wherein:
the processor is further configured to start a validity timer; and on a condition that the validity timer expires after a period equal to the at least one validity timer value, the processor is further configured to deactivate the at least one selected power saving mechanism.

5 . The WTRU of claim 1 , wherein the request message is a tracking area update (TAU) request message or an attach request message.

6 . The WTRU of claim 1 , wherein the at least one selected parameter has a different value than a corresponding parameter in the plurality of parameters associated with plurality of power saving mechanisms supported by the WTRU.

7 . A wireless transmit/receive unit (WTRU) configured to use extended discontinuous reception (eDRX) mode comprising:
a receiver configured to receive paging signals for system information change over an extended Broadcast Control Channel (BCCH) modification period; the receiver configured to receive a paging signal including a flag indicating that the received paging signal is intended for eDRX WTRUs only; and the receiver configured to read updated system information in response to the received paging signal.

8 . The WTRU of claim 7 , wherein the extended BCCH modification period comprises at least a first BCCH modification period and a second BCCH modification period.

9 . The WTRU of claim 8 , wherein the receiver is further configured to receive the paging signals for system information change in the second BCCH modification period and not in the first BCCH modification period.

10 . The WTRU of claim 7 , wherein:
the receiver is further configured to determine if systems changes are needed based on the received updated system information; and a processor configured to make system changes based on the received updated system information.

11 . A method to select a power saving mechanism performed by a wireless transmit/receive unit (WTRU), the method comprising:
sending a request message, wherein the request message includes a plurality of parameters associated with plurality of power saving mechanisms supported by the WTRU; receiving, from a mobility management entity (MME), an accept message including at least one selected parameter associated with at least one selected power saving mechanism, wherein the at least one selected power saving mechanism is from the plurality of power saving mechanisms supported by the WTRU; and activating the at least one selected power saving mechanism.

12 . The method of claim 11 , wherein the plurality of power saving mechanisms include at least power saving mode (PSM) and extended discontinuous reception (eDRX) mode.

13 . The method of claim 12 , wherein a parameter associated with PSM is an active time and a parameter associated with eDRX mode is a preferred discontinuous reception (DRX) value.

14 . The method of claim 11 , wherein the accept message further includes at least one validity timer value associated with the at least one selected power saving mechanism, further comprising:
starting a validity timer; and on a condition that the validity timer expires after a period equal to the at least one validity timer value, deactivating the at least one selected power saving mechanism.

15 . The method of claim 11 , wherein the request message is a tracking area update (TAU) request message or an attach request message.

16 . The method of claim 11 , wherein the at least one selected parameter has a different value than a corresponding parameter in the plurality of parameters associated with plurality of power saving mechanisms supported by the WTRU.

17 . A method performed by a wireless transmit/receive unit (WTRU) using extended discontinuous reception (eDRX) mode, the method comprising:
receiving paging signals for system information change over an extended Broadcast Control Channel (BCCH) modification period; receiving a paging signal including a flag indicating that the received paging signal is intended for eDRX WTRUs only; and reading updated system information in response to the received paging signal.

18 . The method of claim 17 , wherein the extended BCCH modification period comprises at least a first BCCH modification period and a second BCCH modification period.

19 . The method of claim 18 , further comprising:
receiving the paging signals for system information change in the second BCCH modification period and not in the first BCCH modification period.

20 . The method of claim 17 , further comprising:
determining if systems changes are needed based on the received updated system information; and making system changes based on the received updated system information.

Assignees

• Interdigital Patent Holdings Inc
• Interdigital Patent Holdings Inc

Inventors

• Wang Guanzhou
• Ahmad Saad
• Aghili Behrouz
• Freda Martino M
• Watfa Mahmoud
• Olvera-Hernandez Ulises
• Adjakple Pascal M

Classifications

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W76/28

  Discontinuous transmission [DTX]; Discontinuous reception [DRX] · CPC title

• H04W52/0216 Primary

  using a pre-established activity schedule, e.g. traffic indication frame · CPC title

• Y02D30/70

  in wireless communication networks · CPC title

• H04W72/0473

  the resource being transmission power · CPC title