Power saving in Wi-Fi devices utilizing bluetooth

• US 9,763,186 B2
• Filed: 08/08/2016
• Issued: 09/12/2017
• Est. Priority Date: 12/23/2014
• Status: Active Grant

• Current Assignee: Fortinet Inc.
• Original Assignee: Fortinet Inc.
• Inventors: Radhakrishnan, Suryanarayanan, Bhargava, Saurabh, Gandotra, Sanjay
• Primary Examiner(s): Wong, Warner
• Application Number:
  US15/231,169
• Publication Number:
  US 20170094595A1
• Time in Patent Office: 400 Days
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: H04W 40/005 Routing actions in the presence of nodes in sleep or doze mode
• CPC Class Codes: H04W 52/0209 in terminal devices terminal devices per se H04W88/02
• CPC Class Codes: H04W 68/005 Transmission of information for alerting of incoming communication
• CPC Class Codes: H04W 76/15 Setup of multiple wireless link connections
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area 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: H04W 88/10 adapted for operation in multiple networks, e.g. multi-mode access points
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The present description provides methods, computer program products, and systems for saving power in Wi-Fi devices utilizing Bluetooth. A Wi-Fi radio transitions to deep sleep mode from active mode while a Bluetooth radio remains active. An active Wi-Fi connection to the access point can be maintained by the station while in deep sleep mode as needed to prevent being disassociated. Responsive to the indication of data packets waiting at the access point, sent over the Bluetooth radio, the Wi-Fi radio at the station can be transitioned from the deep sleep mode to the active mode. A notification of active mode is sent to the access point currently associated with the Wi-Fi radio so that packets can be forwarded.

Claims

1. A computer-implemented method in an access point of a wireless network for power saving to connected stations utilizing Bluetooth, comprising the steps of:

receiving a notification of deep sleep mode from a station having a Wi-Fi radio and associated with the access point, wherein the Wi-Fi radio transitions to deep sleep mode from active mode while a Bluetooth radio of the station remains active;

maintaining an active connection to the station while in deep sleep mode, wherein the station maintains active state information in a non-volatile internal data structure;

receiving data packets addressed to the station for Wi-Fi transmission;

responsive to receiving the data packets addressed to the station while in deep sleep mode, sending an indication of data packets addressed to the Wi-Fi radio, over a Bluetooth radio of the access point;

receiving a notification of active mode from the station, responsive to the station transitioning the Wi-Fi radio from the deep sleep ode to the active mode; and

sending one or more data packets to the Wi-Fi radio of the station.

2. The method of claim 1, wherein the Wi-Fi radio of the station transitions to deep sleep mode responsive to at least one of:

a number or rate of packets received, a duration of inactivity, a station entering sleep mode, a policy, or user input.

3. The method of claim 1, further wherein the Wi-Fi radio of the station transitions to deep sleep mode responsive to receiving an acknowledgment from the access point of the deep sleep notification sent.

4. The method of claim 1, wherein maintaining the active connection comprises at least one of:

periodically receiving a packet from the station using the Bluetooth radio concerning the Wi-Fi radio connection, using active state information stored in a non-volatile internal data structure.

5. The method of claim 1, wherein maintaining the active connection comprises:

periodically receiving a packet from the station while temporarily waking up the Wi-Fi radio of the station to transmit the packet to the access point using the Wi-Fi radio concerning the Wi-Fi radio connection.

6. The method of claim 1, further comprising:

wherein the station stores connection information concerning the access point when transitioning to the deep sleep mode; and

wherein the station retrieves connection information concerning the access point from a memory, the connection information including a BSSID for the access point, when transitioning back to the active mode.

7. The method of claim 1, further comprising:

sending a request to turn on the Wi-Fi radio in a payload of a packet sent by the Bluetooth radio of the station, the packet having the access point as a source address and the Bluetooth radio of the station as a destination address, wherein the station generates a command within an operating system of the device to turn on the Wi-Fi radio of the station.

8. The method of claim 7, further comprising:

wherein the station retrieves connection information concerning the access point from a memory of the station, the connection information including a BSSID for the access point, and

wherein the station sends packets from the Bluetooth radio, the packets using a MAC address of the Wi-Fi radio of the station as the source address and the BSSID of the access point a destination address.

9. The method of claim 1, further comprising:

receiving a request to register the Bluetooth radio with the access point associated with the Wi-Fi radio.

10. A non-transitory computer-readable medium storing source code that, when executed, performs a method in an access point of a wireless network for power saving in connected stations utilizing Bluetooth, the method comprising the steps of:

receiving a notification of deep sleep mode from a station having a Wi-Fi radio and associated with the access point, wherein the Wi-Fi radio transitions to deep sleep mode from active mode while a Bluetooth radio of the station remains active;

maintaining an active connection to the station while in deep sleep mode, wherein the station maintains active state information in a non-volatile internal data structure;

receiving data packets addressed to the station for Wi-Fi transmission;

responsive to receiving the data packets addressed to the station while in deep sleep mode, sending an indication of data packets addressed to the Wi-Fi radio, over a Bluetooth radio of the access point;

receiving a notification of active mode from the station, responsive to the station transitioning the Wi-Fi radio from the deep sleep ode to the active mode; and

sending one or more data packets to the Wi-Fi radio of the station.

11. A Wi-Fi device in an access point of a wireless network for power saving to connected stations utilizing Bluetooth, the access point comprising:

a processor;

a network interface; and

a memory, comprising;

a deep sleep manager to receive a notification of deep sleep mode from a station currently associated with a Wi-Fi radio, wherein the Wi-Fi radio transitions to deep sleep mode from active mode while a Bluetooth radio of the station remains active,

the deep sleep manager to maintain an active connection to the station while in deep sleep mode, wherein the station maintains active state information in a non-volatile internal data structure,

a packet queue to receive data packets addressed to the station for Wi-Fi transmission;

wherein the deep sleep manager, responsive to receiving the data packets addressed to the station while in sleep mode, sends an indication of the data packets addressed to the Wi-Fi radio, over the Bluetooth radio of the access point,

wherein the deep sleep manager receives a notification of active mode from the station, responsive to the station transitioning the Wi-Fi radio from the deep sleep mode to the active mode, and

wherein the Wi-Fi radio of the access point sends one or more data packets to the Wi-Fi radio of the station.