Abstract:
Disclosed is a wireless communication apparatus having a self sensing function, which can detect an object by use of a wake-up function without employing a separate sensor. The wireless communication apparatus includes a communication unit wirelessly communicating with a server forming a wireless network, and a wake-up unit waking up the communication unit under the control of the server when the communication unit is in sleep mode, and sensing the presence of an object within a preset communication range according to a reflection signal, which is a signal reflected by the object after being transmitted from the communication unit.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the priority of Korean Patent Application No. 2008-0126729 filed on Dec. 12, 2008, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a wireless communication apparatus, and more particularly, to a wireless communication apparatus having a self sensing function, which can detect an object by utilizing a wake-up function without employing a separate sensor. 
         [0004]    2. Description of the Related Art 
         [0005]    As the recent development of computers has generalized automation, home network systems are being increasingly used, which can operate electronic home appliances automatically. 
         [0006]    A home network system is one that controls various home appliances or electronically controllable products within the home through a single server. Studies are being conducted on various control functions such as home control functions, remote meter reading functions, and control functions involving parking controllers and door opening/closing control interworking with a server in, for example, an apartment complex. Home control functions may include air conditioning controls, control over electronic ovens, washing machines, refrigerators, boilers, gas stoves and the like, and control over lighting, curtains and the like. The remote meter reading functions may include functions involving power meters, water meters, gas meters and the like. 
         [0007]    A home network system requires various sensors to control, for example, the opening and closing of front doors or windows, resulting in undesirable cost increases and limitations in installation space. 
       SUMMARY OF THE INVENTION 
       [0008]    An aspect of the present invention provides a wireless communication apparatus having a self sensing function, which can detect an object by utilizing a wake-up function without employing a separate sensor. 
         [0009]    According to an aspect of the present invention, there is provided a wireless communication apparatus having a self sensing function, the wireless communication apparatus including: a communication unit wirelessly communicating with a server forming a wireless network; and a wake-up unit waking up the communication unit under the control of the server when the communication unit is in sleep mode, and sensing the presence of an object within a preset communication range according to a reflection signal, which is a signal reflected by the object after being transmitted from the communication unit. 
         [0010]    The wake-up unit may detect the object according to a signal level of a reflection signal, which is a reflected wireless communication signal between the communication unit and the server. 
         [0011]    The communication unit may include a first directional antenna outputting a sensing signal in a preset direction, and the wake-up unit comprises a second directional antenna receiving a reflection signal, which is the sensing signal reflected after being output from the first directional antenna, and detects the object according to a signal level of the reflection signal. 
         [0012]    The wake-up unit may include: a signal converter converting the reflection signal into a direct current (DC) signal; and a detector detecting a signal level of the DC signal from the signal converter. 
         [0013]    The communication unit may send the sensing signal using on-off keying, and the detector of the wake-up unit may determine the presence of the object, which is to be detected, according to at least one of the number of high pulses and the number of low pulses of the converted DC voltage from the signal converter. 
         [0014]    The wireless communication apparatus may be a Zigbee wireless communication apparatus that transfers a signal using Zigbee. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0015]    The above and other aspects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
           [0016]      FIG. 1  is a diagram illustrating the configuration of a wireless communication apparatus according to an exemplary embodiment of the present invention; 
           [0017]      FIG. 2  is a diagram illustrating the configuration of a wireless communication apparatus according to another exemplary embodiment of the present invention; and 
           [0018]      FIG. 3  is a diagram illustrating the detailed configuration and signal processing of a wake-up unit employed in a wireless communication apparatus, according to an exemplary embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0019]    Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. 
         [0020]      FIG. 1  is a diagram illustrating the configuration of a wireless communication apparatus according to an exemplary embodiment of the present invention. 
         [0021]    Referring to  FIG. 1 , the wireless communication apparatus  100 , according to this embodiment, may include a communication unit  110  and a wake-up unit  120 . 
         [0022]    The communication unit  110  forms a wireless network with a server, and performs predetermined wireless communications with the server. 
         [0023]    Here, the wireless communication apparatus, according to the present invention, may be a Zigbee wireless communication apparatus, which performs wireless communication according to the Zigbee specification. Thus, the communication unit  110  may perform Zigbee wireless communications and operate in sleep mode at preset intervals, corresponding to the characteristics of the Zigbee specifications of reducing power use. 
         [0024]    When the communication unit  110  is in sleep mode, the wake-up unit  120  may wake up the communication unit  110  under the control of the server so that the communication unit  110  operates normally. 
         [0025]    In addition, the wake-up unit  120  may utilize a reflection signal, a signal reflected after being output from the communication unit  110 , to perform a sensing operation for detecting an object without using a separate sensor. 
         [0026]    That is, when a signal output from the communication unit  110  is transmitted to the wake up unit  120  after being reflected by an object ‘A’, the wake-up unit  120  may detect the object ‘A’ by sensing whether the signal level of the reflection signal transmitted to the wake-up unit  120  is higher than a preset level or by counting the time or number of times that the signal level of the reflection signal is higher than the preset level. 
         [0027]    Accordingly, the wireless communication apparatus  100 , according to this embodiment, may be utilized in networks to sense, for example, the opening and closing of front doors or windows, or the presence of container boxes without using any separate sensor. 
         [0028]    That is, the wake-up unit  120  sends a result of the sensing based on the signal level of the reflection signal. Then, the communication unit  110  may inform a network server of the opening and closing of front doors or windows or of the presence of metallic materials such as containers. 
         [0029]    The wake-up unit  120  may sense the presence of the object ‘A’ according to the signal level of the reflection signal sent as a wireless communication signal transmitted between the communication unit  110  and the server is reflected by the object ‘A’. 
         [0030]    However, the reflection signal may not be transferred smoothly in the case that the object ‘A’ is partially formed of a metallic material such as a window, in comparison with a smoothly transmitted reflection signal when the object ‘A’ is formed entirely of a metallic material like a front door or a container box. 
         [0031]    In this regard, a wireless communication apparatus, according to another exemplary embodiment of the present invention, will now be described with reference to  FIG. 2 . 
         [0032]      FIG. 2  is a diagram illustrating the configuration of a wireless communication apparatus according to another exemplary embodiment of the present invention. 
         [0033]    In the wireless communication apparatus  200  according to this embodiment of  FIG. 2 , a communication unit  210  may include a first directional antenna  211 . 
         [0034]    The first directional antenna  211  may transfer a signal in a preset direction. The first directional antenna  211  may be used to transfer a sensing signal for the detection of an object, apart from an antenna used for wireless communication with a network server. 
         [0035]    Thus, if the opening and closing or the presence of an object ‘A’, which contains just a small amount of metallic material such as a window, is sensed, the direction in which a sensing signal is output from the first directional antenna  211  is set toward the metallic material of the object ‘A’. 
         [0036]    Furthermore, the sensing signal from a communication unit  210  may be a signal modulated using on-off keying method. 
         [0037]    Thus, a wake-up unit  220  may include a second directional antenna  221 . The sensing signal output from the first directional antenna  211  of the communication unit  210  is reflected by the metal in the object ‘A’ and then input to the second directional antenna  221 . 
         [0038]    Therefore, the second directional antenna  221  may be directed such that a reflection signal is smoothly transferred. Here, the reflection signal refers to the sensing signal reflected by the metal in the object after being output from the first directional antenna  211 . 
         [0039]      FIG. 3  is a diagram illustrating the detailed configuration and signal processing of the wake-up unit used in the wireless communication apparatus of  FIG. 1 . 
         [0040]    Referring to  FIGS. 1 and 3 , the wake-up unit  120  used in the wireless communication apparatus of  FIG. 1  may include a signal converter  121  and a detector  122 . The wake-up unit  220  of  FIG. 2  may also have the same configuration as that illustrated in  FIG. 3 . 
         [0041]    The signal converter  121  of the wake-up unit  120  converts the reflection signal, an RF signal, into a direct current (DC) signal. The converted DC signal is transmitted to the detector  122 , and the detector  122  senses the level of the converted DC signal. 
         [0042]    The detector  122  may sense whether or not the level of the DC signal is higher than a preset signal level, or count the number of DC signals above or below a preset signal level for more precise detection. Thereafter, the detector  122  sends an alarm signal to the communication unit  110 . 
         [0043]    The communication unit  110  may inform a network server of information indicating, for example, whether or not a front door or a window is open or whether a container box has moved, based on the result of the detection contained in the alarm signal. 
         [0044]    Accordingly, the server may provide a user with alarms warning of housebreaking, movement of household items or the like. 
         [0045]    According to the embodiment of the present invention, the wake-up unit is utilized in the wireless communication system so as to sense, for example, the opening of a front door or window or the presence of a container box without using a separate sensor. Consequently, costs can be saved and space can be utilized more efficiently because no separate sensor is used. 
         [0046]    As set forth above, according to exemplary embodiments of the invention, an object is detected by use of a wake-up function without using a separate sensor, so that cost increases and spatial limitations may be prevented from occurring due to the use of the sensor. 
         [0047]    While the present invention has been shown and described in connection with the exemplary embodiments, it will be apparent to those skilled in the art that modifications and variations can be made without departing from the spirit and scope of the invention as defined by the appended claims.