Device, method, and apparatus for offline discontinuous reception (DRX) processing with online triggers in cellular systems

Patent metadata

Field	Value
Publication number	US-9603097-B2
Application number	US-49415709-A
Country	US
Kind code	B2
Filing date	Jun 29, 2009
Priority date	Jun 29, 2009
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

An apparatus and method for processing signals are disclosed. The apparatus may include a transceiver configured to receive a first paging signal during a first cycle, a memory, and a processor configured to store the received first paging signal in the memory, to switch the transceiver to an off state after the first paging signal is stored in the memory, to process the stored first paging signal while the transceiver is in the off state, and to determine whether to enter an online mode based on the processing.

First claim

What is claimed is:

1. A method for processing signals, comprising:
switching a transceiver of a mobile device to an on state;
receiving a first paging signal via the transceiver during a first cycle;
determining whether to process the first paging signal in a first processing state or a second processing state in response to one or more triggers;
in response to determining to process the first paging signal in the first processing state:
storing the received first paging signal in a memory of the mobile device;
switching the transceiver to an off state;
processing the stored first paging signal while the transceiver is in the off state;
determining whether to enter an online mode based on the processing; and
in response to determining to enter the online mode, determining whether to enter the online mode during the first cycle or during a second cycle that is subsequent to the first cycle, wherein determining to enter the online mode during the first cycle comprises determining to enter the online mode during the first cycle in response to determining at least one condition selected from the group:
a reference signal received power (RSRP) of a serving cell is less than a threshold of the serving cell,
the RSRP of the serving cell is less than the threshold of the serving cell and a RSRP of at least one neighbor cell is less than a threshold of the at least one neighbor cell,
the at least one neighbor cell satisfies an absolute RSRP threshold and a relative RSRP threshold,
an inter-Radio Access Technologies (inter-RAT) measurement timer of at least one high priority cell has expired, or
an inter-frequency measurement timer of at least one high priority cell has expired; and

in response to determining to process the first paging signal in the second processing state, processing the first paging signal while the transceiver is in the on state.

2. The method of claim 1 , wherein the processing comprises discontinuous receive (DRX) processing the first paging signal.

3. The method of claim 1 , further comprising measuring a strength of a pilot signal of the first paging signal and determining whether to switch the transceiver to the on state based on the measured strength of the pilot signal.

4. The method of claim 3 , further comprising conducting a search of an alternative system if the measured strength of the pilot signal does not exceed a threshold.

5. The method of claim 4 , wherein the alternative system is a Data Optimized (DO) system, a Global System for Mobile Communications (GSM) system, or a Universal Mobile Telecommunication System (UMTS).

6. The method of claim 1 , further comprising:
in response to determining to enter the online mode during the second cycle:
reconfiguring the memory from an offline mode of operation to an online mode of operation; and
entering the online mode during the second cycle.

7. The method of claim 6 , further comprising:
detecting a neighbor cell during the second cycle, wherein the neighbor cell is an asynchronous (ASYNC) frequency division duplex (FDD) long term evolution (LTE) neighbor cell, a synchronous (SYNC) FDD LTE neighbor cell, or a SYNC time division duplex (TDD) LTE neighbor cell;
performing primary synchronization signal (PSS) processing on the neighbor cell while the transceiver is in the on state; and
performing secondary synchronization signal (SSS) processing on the neighbor cell while the transceiver is in the off state.

8. The method of claim 7 , wherein a duration of the PSS processing of the SYNC FDD LTE neighbor cell and the SYNC TDD LTE neighbor cell is less than the duration of the PSS processing of the ASYNC FDD LTE neighbor cell.

9. The method of claim 1 , further comprising:
in response to the determination to enter the online mode during the first cycle based on determining that the RSRP of the serving cell is less than the threshold of the serving cell and that the RSRP of at least one neighbor cell is less than the threshold of the at least one neighbor cell, switching the transceiver of the mobile device to the on state during the first cycle; and
performing neighbor cell detection.

10. The method of claim 1 , further comprising:
in response to the determination to enter the online mode during the first cycle based on determining that the at least one neighbor cell satisfies the absolute RSRP threshold and the relative RSRP threshold, switching the transceiver of the mobile device to the on state prior to receiving a neighbor paging signal of the neighbor cell;
performing time domain (TD) sample capture of the neighbor paging signal;
switching the transceiver of the mobile device to the off state; and
initializing neighbor broadcast channel (NBCH) processing.

11. The method of claim 1 , further comprising:
in response to the determination to enter the online mode during the first cycle based on determining that the RSRP of the serving cell is less than the threshold of the serving cell, switching the transceiver of the mobile device to the on state during the first cycle;
tuning the transceiver to a Radio Access Technologies (RAT) frequency; and
performing inter-RAT measurements.

12. The method of claim 1 , further comprising:
in response to the determination to enter the online mode during the first cycle based on determining that the inter-RAT measurement timer of the at least one high priority cell has expired, switching the transceiver of the mobile device to the on state during the first cycle;
tuning the transceiver to a Radio Access Technologies frequency; and
performing inter-RAT measurements.

13. The method of claim 1 , further comprising:
reconfiguring the memory from an offline mode of operation to an online mode of operation;
in response to the determination to enter the online mode during the first cycle based on determining that the RSRP of the serving cell is less than the threshold of the serving cell, switching the transceiver of the mobile device to the on state during the first cycle;
tuning the transceiver to a predetermined frequency; and
performing inter-frequency measurements.

14. The method of claim 1 , further comprising:
reconfiguring the memory from an offline mode of operation to an online mode of operation;
in response to the determination to enter the online mode during the first cycle based on determining that the inter-frequency measurement timer of the at least one high priority cell has expired, switching the transceiver of the mobile device to the on state during the first cycle;
tuning the transceiver to a predetermined frequency; and
performing inter-frequency measurements.

15. A wireless communication apparatus, comprising:
a transceiver configured to receive a first paging signal during a first cycle;
a memory; and
a processor configured to:
store the received first paging signal in the memory;
switch the transceiver to an off state after the first paging signal is stored in the memory;
determine whether to process the first paging signal in a first processing state or a second processing state in response to one or more triggers;
in response to determining to process the first paging signal in the first processing state:
process the stored first paging signal while the transceiver is in the off state;

determine whether to enter an online mode based on the processing; and
in response to determining to enter the online mode, determining whether to enter the online mode during the first cycle or during a second cycle that is subsequent to the first cycle, wherein determining to enter the online mode during the first cycle comprises

Assignees

• Bhattacharjee Supratik
• Banister Brian C
• Srinivasan Shivratna G
• Qualcomm Inc

Inventors

• Bhattacharjee Supratik
• Banister Brian C
• Srinivasan Shivratna G

Classifications

• H04W76/048

  Electricity · mapped topic

• H04W52/028 Primary

  switching on or off only a part of the equipment circuit blocks · CPC title

• H04W68/00

  User notification, e.g. alerting and paging, for incoming communication, change of service or the like · CPC title

• H04W68/02 Primary

  Arrangements for increasing efficiency of notification or paging channel · CPC title

• H04W52/02

  Power saving arrangements · CPC title