Abstract:
An adaptive dual band Multiple-Input Multiple-Output (MIMO) wireless-fidelity (Wi-Fi) apparatus may include an application processor, an interface unit transmitting data and a control signal from the application processor, a first dual band wireless communications unit performing wireless communications using at least one of a first band and a second band; a second dual band wireless communications unit performing wireless communications using at least one of the first band and the second band upon being operated, a first selecting unit providing a first path between the first dual band wireless communications unit and a first antenna and providing a second path between the second dual band wireless communications unit and the first antenna, and a second selecting unit providing a first path between the second dual band wireless communications unit and the second antenna and providing a second path between the first dual band wireless communications unit and the second antenna.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims the benefit of Korean Patent Application No. 10-2013-0131165 filed on Oct. 31, 2013, with the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. 
       BACKGROUND 
       [0002]    The present disclosure relates to an adaptive dual band Multiple-Input Multiple-Output (MIMO) wireless-fidelity (Wi-Fi) apparatus, and an operating method thereof. 
         [0003]    A wireless local area network (WLAN) communications apparatus, generally an apparatus wirelessly transmitting data via Internet, or the like, conforming to the IEEE 802.11 or IEEE 802.11x (where x is a, b, g, n) standards, may be manufactured as a separate system or may be provided in a portable apparatus such as a mobile phone. 
         [0004]    A WLAN communications apparatus as described above has been recognized as a Wi-Fi apparatus having relatively rapid WLAN transfer rates, as transfer rates have gradually been increased in speed. 
         [0005]    The Wi-Fi apparatus described above may use frequency bands that are different from each other. For example, in an initial WLAN communications apparatus conforming to the IEEE 802.11 standard, a 2.4 GHz band, a single band, has been used, and then, following the IEEE 802.11a standard, a 5 GHz band has also been used. 
         [0006]    Accordingly, a dual band technology capable of using both the 2.4 GHz band and the 5 GHz band in one Wi-Fi apparatus has been developed. 
         [0007]    Meanwhile, in order to implement a Multiple-Input Multiple-Output (MIMO) for increasing a communications transfer rate, since the Wi-Fi apparatus should have a MiMO encoder and a MIMO decoder as well as a plurality of antennas, it has been restrictively used in a system which may have a significant occupied space. 
         [0008]    An existing dual band Wi-Fi apparatus may include both a 2.4 GHz wireless communications chip and a 5 GHz wireless communications chip. 
         [0009]    In an existing dual band Wi-Fi apparatus as described above, the 2.4 GHz band may be used by operating the 2.4 GHz wireless communications chip or the 5 GHz band may be used by operating the 5 GHz wireless communications chip, depending on a communications environment. 
         [0010]    However, since such an existing dual band Wi-Fi apparatuses is used by operating anyone of the 2.4 GHz wireless communications chip and the 5 GHz wireless communications chip, there is a limitation in utilizing two communications chips. 
         [0011]    In addition, in the case in which an existing dual band Wi-Fi apparatus is used in a small portal apparatus such as a mobile phone, there are limitations in implementing MIMOs due to limitations on space, such that a large number of antennas may not be installed. 
         [0012]    The following Related Art Document related to a dual band frequency wireless local area network does not disclose technical contents efficiently utilizing a dual band or technical contents enabling the MIMO to be implemented even in the small portable apparatus. 
       RELATED ART DOCUMENT 
       [0013]    Korean Patent Laid-Open Publication No. 2011-0118839 
       SUMMARY 
       [0014]    Some embodiments of the present disclosure may provide an adaptive dual band MIMO Wi-Fi apparatus capable of efficiently utilizing dual band communications and allowing a MIMO operation to be performed even in a small portable apparatus, and an operating method thereof. 
         [0015]    According to some embodiments of the present disclosure, an adaptive dual band Multiple-Input Multiple-Output (MIMO) wireless-fidelity (Wi-Fi) apparatus may include: an application processor controlling wireless communications according to a service mode, determined depending on an communications environment and a state of a connection target communications device; an interface unit transmitting data and a control signal from the application processor; a first dual band wireless communications unit performing wireless communications using at least one of a first band and a second band according to controlling by the application processor; a second dual band wireless communications unit operating of which is determined according to controlling by the application processor, performing wireless communications using at least one of the first band and the second band upon being operated; a first selecting unit providing a first path between the first dual band wireless communications unit and a first antenna and providing a second path between the second dual band wireless communications unit and the first antenna; and a second selecting unit providing a first path between the second dual band wireless communications unit and the second antenna and providing a second path between the first dual band wireless communications unit and the second antenna. 
         [0016]    According to some embodiments of the present disclosure, an adaptive dual band Multiple-Input Multiple-Output (MIMO) wireless-fidelity (Wi-Fi) apparatus may include: an application processor controlling wireless communications according to a service mode, determined depending on an communications environment and a state of a connection target communications device; an interface unit transmitting data and a control signal from the application processor; a first dual band wireless communications unit enabled to operate according to controlling by the application processor, operated by being synchronized with one of a rising edge and a falling edge of a preset system clock signal, and performing wireless communications using at least one of the first band and the second band; a second dual band wireless communications unit enabled to operate according to controlling by the application processor, operated by being synchronized with the other of the rising edge and the falling edge of the system clock signal, and performing wireless communications using at least one of the first band and the second band; a first selecting unit providing a first path between the first dual band wireless communications unit and a first antenna and providing a second path between the second dual band wireless communications unit and the first antenna; and a second selecting unit providing a first path between the second dual band wireless communications unit and the second antenna and providing a second path between the first dual band wireless communications unit and the second antenna. 
         [0017]    The application processor may include a clock generating unit generating the system clock signal, may be synchronized with one of a rising edge and a falling edge of the system clock signal to control the first dual band wireless communications unit, and may be synchronized with the other of the rising edge and the falling edge of the system clock signal to control the second dual band wireless communications unit. 
         [0018]    The first selecting unit may include a diplexer low-passing a first band signal between the first dual band wireless communications unit and the first antenna and high-passing a second band signal between the second dual band wireless communications unit and the first antenna. 
         [0019]    The second selecting unit may include a diplexer low-passing a first band signal between the second dual band wireless communications unit and the second antenna and high-passing a second band signal between the first dual band wireless communications unit and the second antenna. 
         [0020]    The first dual band wireless communications unit may include: a first media access control (MAC) layer unit processing transmission and reception data frames; a first physical layer unit connected to the first MAC layer unit and including a first band physical layer unit processing modulation and demodulation, coding, and decoding for transmission and reception data for the first band and a second band physical layer unit processing modulation and demodulation, coding, and decoding for transmission and reception data for the second band; and a first dual band wireless communications unit including a first band wireless communications unit connected to the first band physical layer unit and performing wireless transmissions and reception through the first band and a second band wireless communications unit connected to the second band physical layer unit and performing wireless transmissions and reception through the second band. 
         [0021]    The second dual band wireless communications unit may include: a second media access control (MAC) layer unit processing transmission and reception data frames; a second physical layer unit connected to the second MAC layer unit and including a first band physical layer unit processing modulation and demodulation, coding, and decoding for transmission and reception data for the first band and a second band physical layer unit processing modulation and demodulation, coding, and decoding for transmission and reception data for the second band; and a second dual band wireless communications unit including a first band wireless communications unit connected to the first band physical layer unit and performing wireless transmissions and reception through the first band and a second band wireless communications unit connected to the second band physical layer unit and performing wireless transmissions and reception through the second band. 
         [0022]    According to some embodiments of the present disclosure, an operating method of an adaptive dual band Multiple-Input Multiple-Output (MIMO) wireless-fidelity (Wi-Fi) apparatus may include: collecting, by an application processor, information on surrounding communications device states for communication and a communications environment through a first dual band wireless communications unit; determining, by the application processor, whether or not a concurrent connection to two communications devices is possible based on the collected information; determining whether or not a dual band connection of a connection target communications device is possible when the concurrent connection to the two communications devices is possible; determining whether or not a MIMO operation of the connection target communications device is possible when the concurrent connection to the two communications devices is not possible or the dual band connection of the connection target communications device is not possible; and performing, by the application processor, communications in one of a single mode, a dual mode, and a MIMO mode using at least one of the first and second dual band wireless communications units by sharing channel information with the connection target communications device according the determination result. 
         [0023]    According to some embodiments of the present disclosure, an operating method of an adaptive dual band Multiple-Input Multiple-Output (MIMO) wireless-fidelity (Wi-Fi) apparatus may include: collecting, by an application processor, information on surrounding communications device states for communication and a communications environment through a first dual band wireless communications unit; determining, by the application processor, whether or not a concurrent connection to two communications devices is possible based on the collected information; determining whether or not a dual band connection of a connection target communications device is possible when the concurrent connection to the two communications devices is possible; determining whether or not a MIMO operation of the connection target communications device is possible when the concurrent connection to the two communications devices is not possible or the dual band connection of the connection target communications device is not possible; and performing, by the application processor, communications in one of a single mode, a dual mode, and a MIMO mode using at least one of the first and second dual band wireless communications units by sharing channel information with the connection target communications device according the determination result, wherein when the application processor performs the communications in the dual mode, the first and second dual band wireless communications units are operated by being synchronized with different edges of a rising edge and a falling edge of a preset system clock signal. 
         [0024]    In the performing of the communications, when the MIMO operation of the connection target communications device is not possible in the determining of whether or not the MIMO operation is possible, the communications may be performed in the single mode using one of first and second bands through the first dual band wireless communications unit. 
         [0025]    In the performing of the communications, when the MIMO operation of the connection target communications device is possible in the determining of whether or not the MIMO operation is possible, the communications may be performed by using the MIMO operation using one of first and second bands through the first and second dual band wireless communications units. 
         [0026]    In the performing of the communications, when the dual band connection of the connection target communications device is possible in the determining of whether or not the dual band connection of the connection target communications device is possible, the communications may be performed by using first and second bands through the first and second dual band wireless communications units. 
         [0027]    In the performing of the communications, one of a 2.4 GHz band and a 5 GHz band, supported by the first dual band wireless communications unit, and one of the 2.4 GHz band and the 5 GHz band, supported by the second dual band wireless communications unit may be used. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0028]    The above and other aspects, features and other advantages of the present disclosure will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
           [0029]      FIG. 1  is a block diagram of an adaptive dual band MIMO Wi-Fi apparatus according to an exemplary embodiment of the present disclosure; 
           [0030]      FIG. 2  is a diagram illustrating an example of implementation of an application processor according to an exemplary embodiment of the present disclosure; 
           [0031]      FIG. 3  is an operation timing chart of a system clock signal and first and second dual band wireless communications units according to an exemplary embodiment of the present disclosure; 
           [0032]      FIG. 4  is an internal block diagram of the first and second dual band wireless communications units according to an exemplary embodiment of the present disclosure; 
           [0033]      FIG. 5  is a first diagram of a single mode operation of the first dual band wireless communications unit according to an exemplary embodiment of the present disclosure; 
           [0034]      FIG. 6  is a second diagram of a single mode operation of the first dual band wireless communications unit according to an exemplary embodiment of the present disclosure; 
           [0035]      FIG. 7  is a first diagram of a MIMO operation of the first and second dual band wireless communications units according to an exemplary embodiment of the present disclosure; 
           [0036]      FIG. 8  is a second diagram of a MIMO operation of the first and second dual band wireless communications units according to an exemplary embodiment of the present disclosure; 
           [0037]      FIG. 9  is an diagram of a dual band mode operation of the first and second dual band wireless communications units according to an exemplary embodiment of the present disclosure; and 
           [0038]      FIG. 10  is a flow chart showing an operating method of an adaptive dual band MIMO Wi-Fi apparatus according to an exemplary embodiment of the present disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0039]    Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The disclosure may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Throughout the drawings, the same or like reference numerals will be used to designate the same or like elements. 
         [0040]      FIG. 1  is a block diagram of an adaptive dual band MIMO Wi-Fi apparatus according to an exemplary embodiment of the present disclosure. 
         [0041]    Referring to  FIG. 1 , an adaptive dual band MIMO Wi-Fi apparatus may include an application processor  100 , an interface unit  200 , a first dual band wireless communications unit  300 , a second dual band wireless communications unit  400 , a first selecting unit  500 , and a second selecting unit  600 . 
         [0042]    The application processor  100  may control wireless communications according to a service mode, determined depending on a communications environment and a state of a target communications device. 
         [0043]    For example, the application processor  100  may collect information on the communications environment and the state of the target communications device using the first dual band wireless communications unit  300 . Here, the communications environment may include quality of service information and channel state information for each frequency channel. 
         [0044]    In this case, when dividing the wireless environment by each piece of quality of service (QoS) information, the wireless environment may be divided into voice, video, Internet or best effort, data transfer, background, or the like (see 802.11e MAC). For example, a service that a user wants to use is requested through a wireless communications apparatus (e.g., a Wi-Fi apparatus or a terminal), the quality of service (QoS) information may be obtained through an action of an infra structure mode AP or a Wi-Fi direct (peer-to-peer mode) terminal in response to the request. 
         [0045]    In addition, with respect to the channel state, a state of an air interface may or may not become a situation, suitable for communications in the wireless communications environment. In the case in which the communications are inevitably performed in spite of a bad channel state, since transmission and reception efficiency may be decreased in light of the entire system, a terminal suitable for the channel state may be selected in view of efficiency. 
         [0046]    In addition, the state of the target communications device may include information about whether or not the target communications device supports the dual band mode, the MIMO mode, or the like. 
         [0047]    For example, when the terminal may use only the 2.4 GHz band or the 5 GHz band, the terminal needs to be operated in a single band mode because it may not use the dual band mode. Unlike this, when the terminal may support both the 2.4 GHz band and the 5 GHz band, the terminal is a terminal capable of being operated in the dual band mode. Here, when a typical Wi-Fi apparatus transmits a beacon signal using the 2.4 GHz band and the 5 GHz band, preset by an access point, the terminal may recognize the beacon signal. Alternatively, the typical Wi-Fi apparatus may detect whether the terminal may be operated as surrounding access points or the terminal may be operated in the dual band mode by an active scan. 
         [0048]    Next, the application processor  100  may control wireless communications using the first dual band wireless communications unit  300  and the second dual band wireless communications unit  400  according to a service mode determined depending on the communications environment and the state of the connection target communications device. 
         [0049]    Here, one of the 2.4 GHz band and the 5 GHz band, supported by the first dual band wireless communications unit  300 , and one of the 2.4 GHz band and the 5 GHz band, supported by the second dual band wireless communications unit  400  may be used. In addition, the connection target communications device may be a wireless Wi-Fi apparatus such as an access point, or the like, or a mobile device such as a smart phone, or the like. 
         [0050]    The interface unit  200  may transmit data and a control signal from the application processor  100  to the first dual band wireless communications unit  300  and the second dual band wireless communications unit  400  and may transmit data from the first dual band wireless communications unit  300  and the second dual band wireless communications unit  400 , respectively, to the application processor  100 . 
         [0051]    The first dual band wireless communications unit  300  may perform wireless communications using at least one of the first band and the second band according to controlling by the application processor  100 . 
         [0052]    Whether or not the second dual band wireless communications unit  400  is operated may be determined according to controlling by the application processor  100  and when the second dual band wireless communications unit  400  is operated, the second dual band wireless communications unit  400  may perform wireless communications using at least one of the first band and the second band. 
         [0053]    Here, one of the first dual band wireless communications unit  300  and the second dual band wireless communications unit  400  is given with priority as a main IC (a primary main IC) and the other may be set as a sub-IC (a secondary IC). 
         [0054]    The first selecting unit  500  may provide a first path between the first dual band wireless communications unit  300  and a first antenna ANT1 and may provide a second path between the second dual band wireless communications unit  400  and the first antenna ANT1. 
         [0055]    The second selecting unit  600  may provide a first path between the second dual band wireless communications unit  400  and a second antenna ANT2 and may provide a second path between the first dual band wireless communications unit  300  and the second antenna ANT2. 
         [0056]      FIG. 2  is a diagram illustrating an example of implementation of an application processor according to an exemplary embodiment of the present disclosure. 
         [0057]    Referring to  FIG. 2 , the application processor  100  may include a clock generating unit  110  generating a system clock signal (SCLK). 
         [0058]    In this case, the application processor  100  may be synchronized with one of a rising edge and a falling edge of the system clock signal (SCLK) to control the first dual band wireless communications unit  300  and may be synchronized with the other of the rising edge and the falling edge of the system clock signal (SCLK) to control the second dual band wireless communications unit  400 . 
         [0059]    For example, in the case in which the first dual band wireless communications unit  300  is synchronized with the rising edge of the system clock signal (SCLK) to perform signal processing, the second dual band wireless communications unit  400  may be synchronized with the falling edge of the system clock signal (SCLK) to perform signal processing, or vice versa. 
         [0060]    As described above, in the case in which the first dual band wireless communications unit  300  is synchronized with the rising edge of the system clock signal (SCLK) to perform signal processing and the second dual band wireless communications unit  400  is synchronized with the falling edge of the system clock signal (SCLK) to perform signal processing, the first and second dual band wireless communications units  300  and  400  may be operated separately and may process a signal at relatively high speed without causing a particular time delay. 
         [0061]      FIG. 3  is an operation timing chart of a system clock signal and first and second dual band wireless communications units according to an exemplary embodiment of the present disclosure. 
         [0062]    Referring to  FIG. 3 , as an example, the first dual band wireless communications unit  300  may be synchronized with the rising edge of the system clock signal (SCLK) to perform signal processing and the second dual band wireless communications unit  400  may be synchronized with the falling edge of the system clock signal (SCLK) to perform signal processing. 
         [0063]    An illustration described in the present specification is an example for assisting in the understanding of the description. Therefore, the present disclosure is not limited thereto. 
         [0064]    Referring to  FIG. 1 , the first selecting unit  500  and the second selecting unit  600  may be implemented by a diplexer. 
         [0065]    In this case, the diplexer, the first selecting unit  500 , may low-pass a first band signal between the first dual band wireless communications unit  300  and the first antenna ANT1 and may high-pass a second band signal between the second dual band wireless communications unit  400  and the first antenna ANT1. 
         [0066]    In addition, the diplexer, the second selecting unit  600 , may low-pass a first band signal between the second dual band wireless communications unit  400  and the second antenna ANT2 and may high-pass a second band signal between the first dual band wireless communications unit  300  and the second antenna ANT2. 
         [0067]    With respect to whether or not the first selecting unit  500  is used or the second selecting unit  600  is used, the application processor  100  may use the first and second selecting units  500  and  600  by detecting channel information to select an antenna having a good channel state. 
         [0068]      FIG. 4  is an internal block diagram of the first and second dual band wireless communications units according to an exemplary embodiment of the present disclosure. 
         [0069]    Referring to  FIG. 4 , the first dual band wireless communications unit  300  may include a first media access control (MAC) layer unit  310 , a first physical layer unit  320 , and a first dual band wireless communications unit  330 . 
         [0070]    The first MAC layer unit  310  may process transmission and reception data frame from the application processor  100  or data from the first physical layer unit  320 . 
         [0071]    The first physical layer unit  320  may be connected to the first MAC layer unit  310  and the first dual band wireless communications unit  330  and may include a first band physical layer unit  321  and a second band physical layer unit  322 . The first band physical layer unit  321  may process modulation and demodulation, coding, and decoding on transmission and reception data for the first band and the second band physical layer unit  322  may process modulation and demodulation, coding, and decoding on transmission and reception data for the second band. 
         [0072]    The first dual band wireless communications unit  330  may include a first band wireless communications unit  331  and a second band wireless communications unit  332  connected to the first band physical layer unit  321  and the second band physical layer unit  322 , respectively. The first band wireless communications unit  331  may be connected to the first band physical layer unit  321  to perform wireless transmissions and reception through the first band, and the second band wireless communications unit  332  may be connected the second band physical layer unit  322  to perform wireless transmissions and reception through the second band. 
         [0073]    The second dual band wireless communications unit  400  may include a second MAC layer unit  410 , a second physical layer unit  420 , and a second dual band wireless communications unit  430 . 
         [0074]    The second MAC layer unit  410  may process transmission and reception data frame from the application processor  100  or data from the second physical layer unit  420 . 
         [0075]    The second physical layer unit  420  may be connected to the second MAC layer unit  410  and the second dual band wireless communications unit  430  and may include a first band physical layer unit  421  and a second band physical layer unit  422 . The first band physical layer unit  421  may process modulation and demodulation, coding, and decoding on transmission and reception data for the first band and the second band physical layer unit  422  may process modulation and demodulation, coding, and decoding on transmission and reception data for the second band. 
         [0076]    The second dual band wireless communications unit  430  may include a first band wireless communications unit  431  and a second band wireless communications unit  432  connected to the first band physical layer unit  421  and the second band physical layer unit  422 , respectively. The first band wireless communications unit  431  may be connected to the first band physical layer unit  421  to perform wireless transmissions and reception through the first band and the second band wireless communications unit  432  may be connected to the second band physical layer unit  422  to perform wireless transmissions and reception through the second band. 
         [0077]      FIG. 5  is a first diagram of a single mode operation of the first dual band wireless communications unit according to an exemplary embodiment of the present disclosure and  FIG. 6  is a second diagram of a single mode operation of the first dual band wireless communications unit according to an exemplary embodiment of the present disclosure. 
         [0078]    Referring to  FIGS. 5 and 6 , when the connection to two connection target communications devices is not possible or a dual band connection of the connection target communications device is not possible, the application processor  100  may determine whether or not the MIMO operation is possible and may perform communications in a single mode using one of the first and second bands through the first dual band wireless communications unit  300  when the MIMO operation of the connection target communications device is not possible. 
         [0079]      FIG. 5  illustrates an example in which the first dual band wireless communications unit  300  is operated in a single mode using the 2.4 GHz band of the 2.4 GHz band and the 5 GHz band and  FIG. 6  illustrates an example in which the first dual band wireless communications unit  300  is operated in a single mode using the 5 GHz band of the 2.4 GHz band and the 5 GHz band. 
         [0080]      FIG. 7  is a first diagram of a MIMO operation of the first and second dual band wireless communications units according to an exemplary embodiment of the present disclosure and  FIG. 8  is a second diagram of a MIMO operation of the first and second dual band wireless communications units according to an exemplary embodiment of the present disclosure. 
         [0081]    Referring to  FIGS. 7 and 8 , when the connection to two connection target communications devices is not possible or a dual band connection of the connection target communications device is not possible, the application processor  100  may determine whether or not the MIMO operation is possible and may perform communications in a MIMO mode using one of the first and second bands through the first and second dual band wireless communications units  300  and  400  when the MIMO operation of the connection target communications device is possible. 
         [0082]      FIG. 7  illustrates a communications example in which the first and second dual band wireless communications units  300  and  400  are operated in a MIMO mode using the 2.4 GHz band and  FIG. 8  illustrates a communications example in which the first and second dual band wireless communications units  300  and  400  are operated in a MIMO mode using the 5 GHz band. 
         [0083]    Here, in the case in which the first and second dual band wireless communications units  300  and  400  may perform the MIMO operation, a terminal needs to prepare a baseband signal processing for baseband MIMO operation and MIMO communications so that a concurrent signal processing is possible. 
         [0084]    For example, as described above, in the case in which the channel information for the respective first and second antennas ANT1 and ANT2 is detected, the first and second dual band wireless communications units  300  and  400  are operated as a main IC (a primary main IC) and a sub IC (a secondary IC), respectively, to appropriately distribute and combine an original signal and transmit and receive the distributed and combined signal. This operation may be performed through a hardware control and a software control which may be suitably controlled by the application processor  100  and the interface unit  200 . 
         [0085]      FIG. 9  is a diagram of a dual band mode operation of the first and second dual band wireless communications units according to an exemplary embodiment of the present disclosure. 
         [0086]    Referring to  FIG. 9 , the application processor  100  may determine whether or not a dual band connection of the connection target communications device is possible and may perform communications using the first and second bands through the first and second dual band wireless communications units  300  and  400  when the dual band connection of the connection target communications device is possible. 
         [0087]    For example, the application processor  100  may perform communications using the first and second bands through the first and second dual band wireless communications units  300  and  400 . 
         [0088]      FIG. 10  is a flow chart showing an operating method of an adaptive dual band MIMO Wi-Fi apparatus according to an exemplary embodiment of the present disclosure. 
         [0089]    An operating method of an adaptive dual band MIMO Wi-Fi apparatus according to an exemplary embodiment of the present disclosure will be described with reference to  FIGS. 1 through 10 . 
         [0090]    Hereinafter, in describing an operating method of an adaptive dual band MIMO Wi-Fi apparatus according to an exemplary embodiment of the present disclosure, the description for the operations performed with reference to  FIGS. 1 through 9  may be applied thereto. Therefore, an overlapped description in the case of a description of operating method of an adaptive dual band MIMO Wi-Fi apparatus will be omitted. 
         [0091]    Referring to  FIG. 10 , in S 100 , an application processor  100  may collect information on a state of surrounding communications devices to communicate and a communications environment through a first dual band wireless communications unit  200 . 
         [0092]    Here, based on information in which the adaptive dual band MIMO Wi-Fi apparatus according to an exemplary embodiment of the present disclosure collects while performing WLAN communications with surrounding terminals and access points, it may be detected whether or not a concurrent connection to the two communications devices is possible, whether or not a dual band connection of the connection target communications device is possible, and whether or not an operation in the MIMO mode of the connection target communications device is possible. 
         [0093]    In S 200 , the application processor  100  may determine whether or not the concurrent connection to the two communications devices is possible based on the collected information. 
         [0094]    In S 300 , in the case in which the concurrent connection to the two communications devices is possible, the application processor  100  may determine whether or not the dual band connection of the connection target communications device is possible. 
         [0095]    In S 400 , in the case in which the concurrent connection to the two communications devices is not possible or the dual band connection of the connection target communications device is not possible, the application processor  100  may determine whether or not the MIMO operation of the connection target communications device is possible. 
         [0096]    In S 500 , the application processor  100  may share the channel information with the connection target communications device according to the determination result and may perform communications in one of a single mode, a dual mode, and a MIMO mode using at least one of the first and second dual band wireless communications units  300  and  400 . 
         [0097]    In S 500  performing the communications, in the case in which the MIMO operation of the connection target communications device is not possible in S 400  in which the application processor  100  determines whether or not the MIMO operation is possible, the application processor  100  may perform communications in the single mode using one of the first and second bands through the first dual band wireless communications unit  300 . 
         [0098]    In S 500  performing the communications, in the case in which the MIMO operation of the connection target communications device is possible in S 400  in which the application processor  100  determines whether or not the MIMO operation is possible, the application processor  100  may perform communications by using the MIMO operation using one of the first and second bands through the first and second dual band wireless communications units  300  and  400 . 
         [0099]    In S 500  performing the communications, in the case in which the dual band connection of the connection target communications device is possible in S 300  in which the application processor  100  determines whether or not the dual band connection of the connection target communications device is possible, the application processor  100  may perform communications using the first and second bands through the first and second dual band wireless communications units  300  and  400 . 
         [0100]    In S 500  performing the communications, one of the 2.4 GHz band and the 5 GHz band, supported by the first dual band wireless communications unit  300  and one of the 2.4 GHz band and the 5 GHz band, supported by the second dual band wireless communications unit  400  may be used. 
         [0101]    For example, in the case in which the adaptive dual band MIMO Wi-Fi apparatus according to an exemplary embodiment of the present disclosure performs communications in the dual band mode, the adaptive dual band MIMO Wi-Fi apparatus may receive Internet data using the 2.4 GHz band and may transmit video data to a smart TV using the 5 GHz band to view the smart TV. 
         [0102]    In addition, when the adaptive dual band MIMO Wi-Fi apparatus according to an exemplary embodiment of the present disclosure is operated as a soft access point (soft AP), data may be received using the 2.4 GHz band while transmitting data using the 5 GHz band. 
         [0103]    According to exemplary embodiments of the present disclosure, the dual band communications may be efficiently utilized and the MIMO operation may be performed even in the small portable apparatus. 
         [0104]    While exemplary embodiments have been shown and described above, it will be apparent to those skilled in the art that modifications and variations could be made without departing from the spirit and scope of the present disclosure as defined by the appended claims.