Patent Application
20130219201
This Application claims priority of China Patent Application No. 201210042913.0, filed on Feb. 22, 2012, the entirety of which is incorporated by reference herein.
1. Field of the Invention
The invention relates to a positioning system, and more particularly to a low power consumption positioning system.
2. Description of the Related Art
Electronic applications and products to improve the quality of life have become more and more popular. Within the various kinds of electronic device products, there are some products which integrate multiple functionalities together so as to improve the convenience for users.
For example, cellular phones, tablet computers, or other electronic devices integrating the functionalities of global positioning, short distance data transmission and long distance data transmission . . . etc. together have become more and more popular.
However, as the amount of functionalities provided by an electronic device increases, the power consumption of the electronic device increases, accordingly. Therefore, a low power consumption electronic device and method for extending life span of the battery equipped in the electronic device is highly required.
Electronic device systems and methods for maintaining low power consumption while providing a positioning function in an electronic device system are provided. An exemplary embodiment of an electronic device system comprises a first device and a second device. The first device controls system operations and operates in at least a normal mode and a sleep mode having lower power consumption than the normal mode. After issuing a condition setting signal carrying at least a wake up condition, the first device switches from the normal mode to the sleep mode, and after receiving an interrupt indication signal, the first device switches from the sleep mode to the normal mode. The second device is coupled to the first device and continuously receives and processes a plurality of satellite signals to obtain position information. The second device receives the condition setting signal from the first device and determines whether the wake up condition has been met according to the position information. When the wake up condition has been met, the second device issues the interrupt indication signal.
An exemplary embodiment of a method for maintaining low power consumption while providing a positioning function in an electronic device system comprises: issuing a condition setting signal carrying at least a wake up condition by a first device, wherein after issuing the condition setting signal, the first device enters a sleep mode having low power consumption; receiving the condition setting signal by a second device; continuously receiving and processing a plurality of satellite signals to obtain position information by the second device; determining whether the wake up condition has been met according to the position information by the second device; and issuing an interrupt indication signal to wake up the first device by the second device when the wake up condition has been met.
A detailed description is given in the following embodiments with reference to the accompanying drawings.
The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:
The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.
For example, the master device 110 may be an application processor of a portable electronic device (such as a cellular phone, personal digital assistance, or any portable or handheld electronic devices) or a computer device (such as a personal computer, a tablet computer, or any portable computer devices), and may comprise at least a central processing unit, a storage medium and a plurality of hardware resources and software modules. The master device 110 may manage the hardware resources and software modules of the electronic device system 100 according to a set of operation system functions or a set of predetermined platform management functions, and may interact with the peripheral devices for controlling the system operations. The peripheral devices 120, 130 and 140 may be chips or modules for providing different supplementary functions. For example, the peripheral devices 120, 130 and 140 may be a Global Position System (GSP) receiver chip or GPS receiver module, WiFi chip or WiFi module, LCD chip or LCD module, Bluetooth chip or Bluetooth module, or others.
Note that although there are three peripheral devices shown in
According to an embodiment of the invention, the master device 110 may operate in at least a normal mode and a sleep mode having lower power consumption than the normal mode. When the master device 110 operates in the sleep mode, the system clock may be stopped. Therefore, the master device 110 basically does not function to achieve the best power saving result. In a preferred embodiment of the invention, one of the peripheral devices 120, 130 and 140 may be the device having the positioning function. For example, the peripheral device 120 may be the above-mentioned GSP receiver chip or GSP receiver module for receiving and processing satellite signals to obtain position information, while another one may be a display device having the display function. For example, the peripheral device 130 may be the above-mentioned LCD chip or LCD module for displaying the position information in real-time or displaying other system information. When a user needs the GSP function for a long period and also hopes the electronic device system 100 to consume as less power as possible, the user may activate a low power consumption positioning mechanism so that the electronic device system 100 may operate in a power saving mode and still maintain the positioning capability. The proposed low power consumption positioning mechanism will be illustrated in more detail in the following paragraphs.
According to an embodiment of the invention, when the electronic device system 100 and/or the master device 110 operate in the normal mode, the user may enter or set up some wake up conditions through the user interface of the electronic device system 100. After receiving information regarding the wake up conditions entered or set up by the user, the master device 110 may generate and issue a condition setting signal SET carrying the wake up condition(s) to the peripheral device 120. After issuing the condition setting signal SET (or, in other embodiments, when the master device 100 receives at least an acknowledge signal responded by the peripheral device 120), the master device 110 may switch from the normal mode to the sleep mode. As the master device 110 enters the sleep mode, the peripheral device 130 may be notified and enter the sleep mode, too. When the peripheral device 130 has entered the sleep mode, the peripheral device 130 may not display the position information.
Although the master device 110 has entered the sleep mode, the peripheral device 120 may still operate in the background so as to obtain the position information in real-time. After obtaining the position information, the peripheral device 120 may determine whether the wake up condition set by the master device 110 is met according to the position information. When the wake up condition has been met, the peripheral device 120 may issue the interrupt indication signal INT to wake up the master device 110. After issuing the interrupt indication signal INT, the peripheral device 120 may further transmit the currently obtained position information P_INFO to the master device 110.
According to an embodiment of the invention, the communication interface 121 between the master device 110 and the peripheral device 120 may comprise one or more hardware devices, such as the General Purpose I/O (GPIO), the Universal Asynchronous Receiver/Transmitter (UART), or others, for transmitting or receiving the condition setting signal SET, the interrupt indication signal INT and the position information P_INFO. After receiving the interrupt indication signal INT, the master device 110 may switch from the sleep mode to the normal mode. After receiving the position information P_INFO, the master device 110 may further direct the peripheral device 130 to display the current position information.
According to another embodiment of the invention, the master device 110 and the peripheral device 130 may again enter the sleep mode to save the battery power after displaying the position information for a predetermined period. In the embodiments of the invention, because the low power consumption positioning mechanism is activated, the master device 110 and/or the peripheral device 130 may be awake only when the wake up condition has been met, so that the electronic device system 100 can have the best power saving performance.
According to the embodiments of the invention, the wake up condition may be the target time, target speed, target altitude, target location, target value, or any combination thereof, or others. For example, in an embodiment of the invention, when the wake up condition is the target time, the peripheral device 120 may obtain a current time from the currently obtained position information (or obtain by other ways, such as from the master device 110). When the current time achieves the target time, the peripheral device 120 may issue the interrupt indication signal INT.
According to another embodiment of the invention, when the wake up condition is the target speed, the peripheral device 120 may estimate a current speed according to the currently obtained position information. For example, the peripheral device 120 may obtain the longitude and latitude of the current location of the electronic device system 100 according to the satellite signals and estimate a moving speed of the electronic device system 100 according to the amount of change in the longitude and latitude per unit time. When the current speed achieves the target speed, the peripheral device 120 may issue the interrupt indication signal INT. Note that in the embodiment of the invention, the term “achieve” used here may have different meanings according to different system designs. For example, when the current speed has increased to exceed the target speed, when the current speed has decreased to become less than the target speed, when the current speed equals to or exceeds the target speed, and when the current speed exceeds or is less than the target speed plus or minus a predetermined value, or others, may mean “achieve”.
According to yet another embodiment of the invention, when the wake up condition is the target altitude, the peripheral device 120 may estimate a current altitude according to the currently obtained position information. When the current altitude achieves the target altitude, the peripheral device 120 may issue the interrupt indication signal INT. Note that, similarly, the term “achieve” used here may have different meanings according to different system designs. For example, when the current altitude has increased to exceed the target altitude, when the current altitude has decreased to become less than the target altitude, when the current altitude equals to or exceeds the target altitude, when the current altitude exceeds or is less than the target altitude plus or minus a predetermined value, or others, may all mean “achieve”.
According to yet another embodiment of the invention, when the wake up condition is the target location, the peripheral device 120 may estimate a current location according to the currently obtained position information. For example, the peripheral device 120 may obtain the current location according to the current longitude and latitude of the electronic device system 100. When the current location achieves the target location, the peripheral device 120 may issue the interrupt indication signal INT. Note that, similarly, the term “achieve” used here may have different meanings according to different system designs. For example, when the current location is close to the target location, when the current location is the target location, when the current location is inside of a predefined region centered by the target location, or others may mean “achieve”.
According to yet another embodiment of the invention, the wake up condition may also comprise a start value and an offset. For example, a start time and a time offset, a start speed and a speed offset, a start altitude and an altitude offset, a start location and a distance offset, or any combination thereof, or others. The peripheral device 120 may comprise an adder or a subtractor, or any other unit that can perform addition or subtraction operations.
Based on the proposed low power consumption positioning mechanism, maximum power saving performance of the electronic device system may be achieved when the user activates the low power consumption positioning mechanism or when the master device and/or other device (such as the display device) actively enters the sleep mode. Even if the mater device stops functioning, the electronic device system may still obtain the latest position information so that the position accuracy will not be degraded due to stopping of the functioning of the master device.
The above-described embodiments of the present invention can be implemented in any of numerous ways. For example, the embodiments may be implemented using hardware, software or a combination thereof. It should be appreciated that any component or collection of components that perform the functions described above can be generically considered as one or more processors that control the above discussed function. The one or more processors can be implemented in numerous ways, such as with dedicated hardware, or with general purpose hardware that is programmed using microcode or software to perform the functions recited above.
Use of ordinal terms such as “first”, “second”, “third”, etc., in the claims to modify a claim element does not by itself connote any priority, precedence, or order of one claim element over another or the temporal order in which acts of a method are performed, but are used merely as labels to distinguish one claim element having a certain name from another element having a same name (but for use of the ordinal term) to distinguish the claim elements.
While the invention has been described by way of example and in terms of preferred embodiment, it is to be understood that the invention is not limited thereto. Those who are skilled in this technology can still make various alterations and modifications without departing from the scope and spirit of this invention. Therefore, the scope of the present invention shall be defined and protected by the following claims and their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201210042913.0 | Feb 2012 | CN | national |
