Abstract:
A technique to extend location-based (e.g. GPS) mobile device battery lifetime by reducing the location-based (e.g. GPS) circuitry power consumption is provided. The technique defines and controls when to start power and when to stop power to the device in the context of a mobile terminating (MT) location request and/or a mobile originated (MO) location request that is either on-demand or periodic.

Description:
FIELD OF THE INVENTION 
     This invention relates to a method and apparatus for location-based (e.g. Global Positioning System (GPS)) mobile power control. 
     BACKGROUND OF THE INVENTION 
     By way of background, there is typically no power control of a GPS device during usage so, once the GPS is powered-on, it will stay on continuously. This is significant because the use of GPS features in a mobile device (whether a stand-alone mobile GPS device or a communication device such as a wireless phone, etc.) consumes a relatively large amount of power. 
     In stand-alone GPS devices, excessive amounts of power are needed to register the device on the network, as well as constantly run the GPS functionality. 
     In communication devices where GPS is merely one of the features, the registration or log-on procedure is not as time consuming as for a stand-alone GPS device—because the device is typically already logged into the telecommunication network and may also be linked to satellite signals. Nonetheless, since the battery for an integrated GPS mobile device is shared by both the GPS functionality and mobile communication functionality, it is extremely important to control the battery power consumed by the GPS functionality. 
     Generally, there are at least two kinds of Location-based Services (LBS) that utilize GPS functionality in a mobile device: mobile originated (MO) LBS and mobile terminated (MT) LBS. For MO LBS, the LBS application is located in the mobile device and the LBS request is originated from the LBS application, e.g. a turn-by-turn directions application or other location-based application. For the MT LBS, the request for the mobile device location is initiated by an LBS application outside the mobile device, e.g., a fleet tracking application that tracks all vehicles (e.g. rented cars or taxis) of a fleet and shows their locations on the map. 
     SUMMARY OF THE INVENTION 
     A method and apparatus for location-based mobile power control are provided. 
     In one embodiment, a method implemented in a network having a location based services (LBS) server, a location-based services client, and a mobile device having location based functionality comprises sending a control message to the mobile device to activate power to the location based functionality of the mobile device for a fixed period of time, sending a mobile terminating (MT) location request to the mobile device during the fixed period of time based a request from the client, receiving a location report from the mobile device based on the mobile terminating (MT) location request and sending the location report to the client. 
     In another embodiment, the request from the client is a mobile terminating (MT) location request. 
     In another embodiment, the request from the client is sent to the LBS server on a periodic basis. 
     In another embodiment, the control message defines periodic activation of power for the location based functionality. 
     In another embodiment, the control message is sent on-demand based on the request from the client. 
     In another embodiment, a system comprises a location-based services client, a mobile device having location based functionality and a location based services (LBS) server operative to send a control message to the mobile device to activate power to the location based functionality of the mobile device for a fixed period of time, send a mobile terminating (MT) location request to the mobile device during the fixed period of time based a request from the client, receive a location report from the mobile device based on the mobile terminating (MT) location request and send the location report to the client. 
     In another embodiment, the request from the client is a mobile terminating (MT) location request. 
     In another embodiment, the request from the client is sent to the LBS server on a periodic basis. 
     In another embodiment, the control message defines periodic activation of power for the location based functionality. 
     In another embodiment, the control message is sent on-demand based on the request from the client. 
     In another embodiment, the location based functionality is Global Positioning System functionality. 
     In another embodiment, a method implemented in a network having a location based services (LBS) server and a mobile device having location based functionality comprises activating power to the location based functionality of the mobile device for a fixed period of time, sending a mobile originating (MO) location request from the mobile device, de-activating power to the location based functionality of the mobile device after sending the mobile originating (MO) location request, receiving the mobile originating (MO) location request by the LBS server and sending a location report to the mobile device based on the mobile originating (MO) location request. 
     In another embodiment, the method further comprises selectively activating power to the location based functionality of the mobile device after receiving the location report by the mobile device. 
     In another embodiment, the activating and de-activating are accomplished in a periodic manner. 
     In another embodiment, the activating and de-activating are accomplished on an on-demand basis. 
     In another embodiment, a system comprises a mobile device having location based functionality, the mobile device being operative to activate power to the location based functionality for a fixed period of time, send a mobile originating (MO) location request, de-activate power to the location based functionality after sending the mobile originating (MO) location request and a location based services (LBS) server operative to receive the mobile originating (MO) location request and send a location report to the mobile device based on the mobile originating (MO) location request. 
     In another embodiment, the mobile device is operative to selectively activate power to the location based functionality of after receiving the location report by the mobile device. 
     In another embodiment, the activating and de-activating are accomplished in a periodic manner. 
     In another embodiment, the activating and de-activating are accomplished on an on-demand basis. 
     In another embodiment, the location based functionality is Global Positioning System (GPS) functionality. 
     Further scope of the applicability of the present invention will become apparent from the detailed description provided below. It should be understood, however, that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
       The present invention exists in the construction, arrangement, and combination of the various parts of the device, and steps of the method, whereby the objects contemplated are attained as hereinafter more fully set forth, specifically pointed out in the claims, and illustrated in the accompanying drawings in which: 
         FIG. 1  is an illustration of a network into which the presently described embodiments may be implemented; 
         FIG. 2  is a call flow diagram according to the presently described embodiments; and, 
         FIG. 3  is a call flow diagram according to the presently described embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     According to the presently described embodiments, circuitry power for GPS (or any other location based system) in a mobile device is controlled such that the power to the GPS (or other location based) circuitry is supplied (or activated) before (e.g. immediately before) the location request for a fixed or predetermined period or periods of time, with some allowance for the GPS (or other location based system) to lock-on to satellite signals. After the mobile device completes its tasks related to the location request, the GPS (or other location based system) circuitry power is turned off (or de-activated) to save battery power. For ease of reference throughout, it should be appreciated that, although GPS is the system described herein, the presently described embodiments may be applied to any location based system, particularly where location based functionality in the mobile device is powered in manners similar to the powering of GPS functionality. 
     For periodic location service for MT LBS, in one form, a control message including the starting time, period, and ending time for GPS power is sent from the location server in the network to the mobile device—before the location request. In one form, the control message also includes satellite information to help the GPS circuit lock on to the satellites quickly. In at least one form, the GPS circuitry power will be controlled from functionality that is located inside the mobile device. Also, a suitable control message may be sent to activate GPS power on an on-demand basis rather than to establish periodic power activation. 
     Similarly, for mobile originated LBS, in one form, the LBS application inside the mobile device knows when the location information will be requested. Therefore, the power control functionality inside the mobile device controls the GPS circuitry power in either an on-demand or periodic manner. 
     Referring now to the drawings wherein the showings are for purposes of illustrating the exemplary embodiments only and not for purposes of limiting the claimed subject matter,  FIG. 1  provides a view of a system into which the presently described embodiments may be incorporated. As shown generally,  FIG. 1  illustrates a network  100 . The network  100  includes a mobile communications network  102  and a LBS network server  104 . 
     It should be appreciated that the LBS network server  104  is in communication with the mobile communications network  102  in manners that are well known in the art. It should also be appreciated that the mobile communications network  102  and the LBS network server  104  may take a variety of forms. For example, the mobile communications network  102  may be a 3G network while the LBS network server  104  may be a stand-alone server, may reside in a switching element such as a mobile switching center (MSC), or may reside within another application server. 
     Also shown functioning within the network  100  are a client  110 , a mobile device  112 , and a mobile device  120 . These devices may take a variety of forms. For example, the client  110  may be a location-based services (LBS) client and/or take the form of a personal computer, a mobile phone or other personal mobile computing or communication device. The mobile devices  112  and  120  may be mobile phones or other personal mobile computing or communication devices, or stand-alone GPS devices. In any form, these devices are configured to implement the present invention. 
     According to the presently described embodiments, battery life for the mobile devices  112  and  120  can be extended by controlling the power that is provided to the GPS functionality within each of these devices. As will be appreciated, such control can be accomplished in a number of ways and in a number of different environments as will be described. 
     More specifically, in one form, the presently described embodiments may advantageously be used when a mobile terminating (MT) location request is sent from a client device to locate a mobile device. In this regard, mobile terminating (MT) location requests are used where a separate client, such as client  110 , seeks the location of a mobile device, such as mobile device  112 . Mobile terminating (MT) location requests are used in many situations including e911 situations, or tracking situations such as in a fleet tracking system or a parental child tracking application. 
     In operation, in this form, the client  110  sends a mobile terminating (MT) location request to the LBS server  104 . The LBS server  104  then communicates the mobile terminating (MT) location request to the mobile device  112  through the mobile communications network  102 . The mobile device  112 , as is well known, calculates its location and sends appropriate information (e.g. a location report) back to the LBS server  104  through the mobile communications network  102 . The client  110  then receives the location report. 
     In this process, according to the presently described embodiments, power to the GPS functionality or circuits of the mobile device  112  is only turned on or activated when needed for fixed or predetermined period(s) of time. This can be accomplished in a variety of ways including in an on-demand manner or in a periodic manner. 
     In an on-demand situation, the LBS network server  104  sends a control message to the mobile device  112  to turn power on prior to sending the location request. The control message dictates to the mobile device  112  the sequence of turning power on and turning power off to the GPS functionality so that the mobile device can perform GPS functions but not waste power. 
     In a periodic situation, the LBS network server  104  sends a control message to the mobile device  112  with information on a starting time, periods, and ending time for powering the GPS functions. 
     In either case, the mobile device  112 , in at least one form, runs a suitable software routine to implement the parameters of the control message sent to the mobile device by the LBS network server. The routine may take a variety of forms, reside in any suitable location and be run by any suitable control processor on the mobile device. Of course, the routine will appropriately interact with necessary hardware. 
     In another form, the presently described embodiments may be applied to situations involving mobile originating (MO) location requests. In these situations, a mobile device, such as mobile device  112 , sends a mobile originating (MO) location request to the network, e.g. the LBS network server  104 , through a mobile communications network, such as network  102 . The LBS network server  104  responds with the appropriate information to the mobile device  120  through the communications network  102 . 
     According to the presently described embodiments, GPS functionality within the mobile device  120  is only activated or powered when the mobile originating (MO) location request is issued. After the request is sent, the power for the GPS functionality is turned off. In this situation, the mobile device  120  controls its own power for the GPS functionality. There may also be situations where periodic activation of the GPS functionality is desired. In either case, similar to the device  112  as described above, software routines within the mobile device  120  are used to turn the power on and/or turn the power off in a desired manner. 
     Referring now to  FIG. 2 , a call flow diagram  200  is illustrated. In this regard, a network server  104  sends a control message to the mobile device  112  through the communication network  102  (at  202  and  204 ). As noted above, this control message can be sent in either an on-demand or a periodic manner. It should be appreciated this control message may take a variety of forms but, in at least one form, includes information on a starting time, a period, and an ending time for power activation of the GPS functionality of the mobile device  112 . If on-demand, the period may not be necessary. 
     In either event, at a subsequent point, the client  110  sends a mobile terminating (MT) location request to the LBS network server  104  (at  206 ). The request is forwarded to the mobile device  112  through the communications network  102  (at  208  and  210 ). A location response is then sent back to the client  110  by the mobile device  112  through the communications network  102  and LBS network server  104  (at  212 ,  214  and  216 ). 
     Notably, as shown, it should be appreciated that whether on-demand or periodic, the power to the GPS functionality in the mobile device  112  is selectively turned on and off. In this way, power is only turned on or activated when needed in accord with the content of the control message. 
     With reference now to  FIG. 3 , a call flow diagram  300  according to the presently described embodiments is illustrated. As shown, the mobile device  120  sends a mobile originating (MO) location request to a LBS network server  104  through the communications network  102  (at  302  and  304 ). The LBS network server  104  responds to the mobile device  120  with a location report through the communication network  102  (at  306  and  308 ). Notably, according to the presently described embodiments, the GPS functionality of the mobile device  120  is only activated when needed, as shown. Typically, this will occur in an on-demand basis; however, periodic activation of the GPS functionality may also be desired in some situations. It should be appreciated that the power to the GPS functionality in the mobile device may be activated after the receipt of the location report depending on a variety of factors including the architecture and functions of the mobile device and design of the network. 
     One alternative embodiment of the presently described embodiments is to apply the solution to the WiMAX technology. In this form, the user device is a WiMAX terminal that has GPS capability and the LBS application may be a third party service provider that does not provide the network services. The location server is in the mobile device&#39;s home CSN (Connectivity Services Network). The location register is located in the WiMAX user&#39;s home AAA. The solution can be used for the periodic location request from the LBS application and MO LBS service. 
     The above description merely provides a disclosure of particular embodiments of the invention and is not intended for the purposes of limiting the same thereto. As such, the invention is not limited to only the above-described embodiments. Rather, it is recognized that one skilled in the art could conceive alternative embodiments that fall within the scope of the invention.