Method for reducing power consumption in Bluetooth and CDMA modes of operation

• US 7,251,508 B2
• Filed: 03/21/2005
• Issued: 07/31/2007
• Est. Priority Date: 08/15/2001
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Pattabiraman, Ganesh, Burke, John M.
• Primary Examiner(s): Anderson; Matthew D.
• Assistant Examiner(s): Pan; Yuwen
• Application Number:
  US11/086,893
• Publication Number:
  US 20050164637A1
• Time in Patent Office: 862 Days
• Field of Search: 455/41.2, 455/502, 455/574, 455/343.2, 455/552.1, 455/553.1, 455/426.1, 455/41.3, 370/350, 370/503, 370/504, 370/491, 370/500, 370/515
• US Class Current: 455/574
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04B 2201/70709 with discontinuous detection
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Method for reducing power consumption in Bluetooth and CDMA modes of operation is disclosed. According to a disclosed embodiment, the time for a next scheduled CDMA wakeup process to be performed by a CDMA module is established. Thereafter, if the next CDMA wakeup process is scheduled to be performed before the next Bluetooth wakeup process, a Bluetooth wakeup process is synchronized to be performed by a Bluetooth module at the same time as the next CDMA wakeup process. Following, when the time arrives for the CDMA module to perform the next CDMA wakeup process, the Bluetooth module also performs the Bluetooth wakeup process.

Claims

1. A method for synchronizing a wakeup schedule for a Bluetooth module and a wakeup schedule for a CDMA module in a wireless mobile unit, comprising:

determining a current CDMA time;

determining a current Bluetooth time;

determining a next CDMA wakeup time;

determining a CDMA interval, said CDMA interval equals to said next CDMA wakeup time less said current CDMA time;

synchronizing a new Bluetooth wakeup time to said next CDMA wakeup time when said next CDMA wakeup time is earlier than a next Bluetooth wakeup time; and

synchronizing said new Bluetooth wakeup time to said next CDMA wakeup time when said current Bluetooth time plus said CDMA interval is less than said next Bluetooth time.

2. A wireless mobile unit comprising:

a CDMA module configured to perform a CDMA wakeup process at a next CDMA wakeup time, said CDMA module comprises a CDMA transmitter/receiver and a CDMA antenna, said CDMA transmitter/receiver and said CDMA antenna being configured to receive a pilot signal from a base station so as to synchronize said CDMA module with said base station, said CDMA module being further configured to derive a current CDMA time from said pilot signal;

a Bluetooth module having a clock, said clock being configured to track a current Bluetooth time; and

a processor configured to synchronize a new Bluetooth wakeup time to said next CDMA wakeup time when said next CDMA wakeup time is earlier than a next Bluetooth wakeup time, said processor being further configured to calculate a CDMA interval, said CDMA interval equals to said next CDMA wakeup time less said current CDMA time.

3. The wireless mobile unit of claim 2 wherein said processor is further configured to synchronize said new Bluetooth wakeup time to said next CDMA wakeup time when said current Bluetooth time plus said CDMA interval is less than said next Bluetooth time.

4. The wireless mobile unit of claim 2 wherein said CDMA module and said Bluetooth module are configured to power on substantially simultaneously so as to reduce said wireless mobile unit'"'"'s power consumption.