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

• US 6,968,219 B2
• Filed: 08/15/2001
• Issued: 11/22/2005
• 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): Nguyen, Lee
• Assistant Examiner(s): Pan, Yuwen
• Application Number:
  US09/930,759
• Publication Number:
  US 20030036416A1
• Time in Patent Office: 1,560 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, 455/343.1, 455/343.4, 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, said method comprising:

determining a current CDMA time; and

determining a current BLUETOOTH time

determining a next CDMA wakeup time;

determining a CDMA interval, said CDMA interval equaling said next CDMA wakeup time minus said current CDMA time;

synchronizing a 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 method for synchronizing a wakeup schedule for a BLUETOOTH module and a wakeup schedule for a CDMA module in a wireless mobile unit, said method comprising:

determining a current CDMA time and a current BLUETOOTH time;

calculating a CDMA interval, said CDMA interval equaling a next CDMA wakeup time less said current CDMA time; and

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

3. The method of claim 2 further comprising:

establishing said next CDMA wakeup time prior to said step of calculating said CDMA time interval; and

establishing said next BLUETOOTH wakeup time prior to said step of synchronizing said new BLUETOOTH time.

4. The method of claim 2 further comprising:

performing a BLUETOOTH wakeup process and a CDMA wakeup process substantially at said new BLUETOOTH wakeup time.

5. The method of claim 4, wherein said performing comprises:

powering on said BLUETOOTH module and said CDMA module substantially simultaneously so as to reduce said wireless mobile unit'"'"'s power consumption.

6. The method of claim 2, wherein said wireless mobile unit comprises a BLUETOOTH-enabled CDMA cell phone.

7. A wireless mobile unit, comprising:

a CDMA module comprising a CDMA transmitter/receiver and a CDMA antenna, said CDMA transmitter/receiver and said CDMA antenna being configured to receive a pilot signal, said CDMA module configured to;

perform a CDMA wakeup process at a next CDMA wakeup time,

derive a current CDMA time from said pilot signal;

a BLUETOOTH module comprising a clock configured to track a current BLUETOOTH time, and

a processor configured to;

calculate a CDMA interval equaling said next CDMA wakeup time minus said current CDMA time,

substantially synchronize a new BLUETOOTH wakeup time to a next CDMA wakeup time when said current BLUETOOTH time plus said CDMA interval is less than a next BLUETOOTH time.