Radio communication device

The present invention relates to a wireless communication device, and is particularly applicable to a wireless communication device capable of a plurality of wireless communications having different standards, and relates to an effective technique.

Conventionally, there are the following methods as a technique for preventing deterioration of communication quality and communication speed due to communication collision or interference in a plurality of wireless communications having different standards using the same frequency band. First, as a physical avoidance method, for example, a method of dividing a frequency band and using different channels (FDM (Frequency Division Multiplex)), or a method of assigning different diffusion codes at the same frequency and the same time to multiplex communication ( CDM (Code Division Multiplex)) etc. Secondly, as a probabilistic and dynamic avoidance method, transmission control is performed using, for example, a frequency hopping method (AFH (Adaptive Frequency Hoping)) in the same frequency band and a carrier sense (CCA (Clear Channel Assessment)) before wireless communication. There is a method to do it.

Another effective method is to avoid power interference by increasing the distance between the antennas of each wireless communication. However, due to the recent miniaturization of communication terminals, it is often not possible to sufficiently separate the antennas in the communication terminal. In such a case, even if the frequency bands of the respective wireless communications are sufficiently separated, they are close to each other. Communication quality and communication speed may not be maintained due to power interference between antennas at a distance. In particular, in a sound source receiving device or the like that receives data such as voice or music, the quality is greatly deteriorated depending on the communication status of other wireless devices, and there is a high possibility that stable conversation and listening to music will be difficult. Therefore, as a method for avoiding interference between communications of different standards, for example, Patent Document 1 discloses.

The technology described in Patent Document 1 is a single communication device capable of communicating with an IEEE 802.11 wireless system and a Bluetooth (registered trademark, the same applies hereinafter) wireless system, and data transmission by the IEEE 802.11 wireless system and a Bluetooth wireless system. Data transmission by Bluetooth is executed in time division.

<p><patcit num="1"><text>Japanese Unexamined Patent Publication No. 2001-217853</text></patcit></p>

<p> However, if communication is performed uniformly in a time-division manner as in Patent Document 1, interference of communication can be prevented, but throughput is lowered. Further, as another method for preventing interference, the inventor has considered that, for example, when a communication control method that always gives priority to wireless communication that requires high quality such as voice and music is adopted, communication is performed. It is possible to prevent the occurrence of frame loss due to interference, but when the wireless communication side that requires high quality requests communication, the other wireless communication side has to interrupt the communication, so the other There is a risk that frame loss will occur in wireless communication and the communication quality of the other wireless communication will deteriorate.</p><p> An object of the present invention is to suppress deterioration of communication quality and communication speed due to communication interference while suppressing a decrease in throughput and occurrence of frame loss in a wireless communication device that performs a plurality of wireless communications having different standards.</p><p> The above and other objects and novel features of the present invention will become apparent from the description and accompanying drawings herein.</p>

<p> A brief description of typical inventions disclosed in the present application is as follows.</p><p> That is, a first wireless communication unit for performing a first wireless communication using the first frequency band and a second wireless communication for performing a second wireless communication using the second frequency band. In the wireless communication device having the unit, the first wireless communication unit analyzes a communication state signal output by the second wireless communication unit, which indicates a signal pattern corresponding to the communication state of the second wireless communication. As a result, it is determined whether or not the second wireless communication is synchronous communication, and if the determination result is synchronous communication, the synchronous communication is performed in synchronization with the communication timing of the synchronous communication. Data is sent and received during the non-communication period when communication is not performed.</p>

<p> The effects obtained by representative of the inventions disclosed in the present application will be briefly described below.</p><p> That is, this wireless communication device can suppress deterioration of communication quality and communication speed due to communication interference while suppressing a decrease in throughput and occurrence of frame loss in a plurality of wireless communications having different standards.</p>

<figref num="1">FIG. 1 is an explanatory diagram showing an outline of a wireless communication terminal according to the first embodiment.</figref><figref num="2">FIG. 2 is an explanatory diagram showing an example (two lines) of a connection method between the wireless device 1 and the wireless device 2.</figref><figref num="3">FIG. 3 is an explanatory diagram showing an example (3 lines) of the connection method between the wireless device 1 and the wireless device 2.</figref><figref num="4">FIG. 4 is a block diagram showing an example of the internal configuration of the wireless communication terminal 100.</figref><figref num="5">FIG. 5 is an explanatory diagram showing an example of the communication environment of WLAN communication.</figref><figref num="6">FIG. 6 is a flow chart showing an example of the determination process of the communication environment of WLAN communication.</figref><figref num="7">FIG. 7 is an explanatory diagram showing an example of the communication state of the BT communication of the wireless device 2.</figref><figref num="8">FIG. 8 is an explanatory diagram showing an example of the communication status signal 502 output from the wireless device 2.</figref><figref num="9">FIG. 9 is an explanatory diagram showing an example of a signal pattern of synchronous communication.</figref><figref num="10">FIG. 10 is a flow chart showing an example of the communication state determination process of the wireless device 2.</figref><figref num="11">FIG. 11 is an explanatory diagram showing an example of a method of adjusting the data transmission timing of the wireless device 1.</figref><figref num="12">FIG. 12 is an explanatory diagram showing an example of data transmission timing when communication between the wireless device 1 and the wireless device 2 is performed in a time-division manner.</figref><figref num="13">FIG. 13 is a flow chart showing an example of a control method for performing communication between the wireless device 1 and the wireless device 2 in a time-division manner.</figref><figref num="14">FIG. 14 is a flow chart showing an example of a communication control method according to the communication state and priority of the wireless device 2.</figref><figref num="15">FIG. 15 is an explanatory diagram showing an example of data transmission timing by communication control according to the communication state and priority of the wireless device 2.</figref>

1. Outline of the embodiment First, an outline of typical embodiments of the invention disclosed in the present application will be described. Reference numerals in the drawings referenced in parentheses in the schematic description of a typical embodiment merely exemplify those included in the concept of the component to which it is attached.

[1] (Wireless communication device that determines the communication pattern (synchronization) and controls communication) The wireless communication device (100) according to a typical embodiment of the present invention is a first wireless communication unit (1) for performing a first wireless communication (WLAN communication) using the first frequency band. , Has a second wireless communication unit (2) for performing a second wireless communication (BT communication) using the second frequency band. The second wireless communication unit transmits / receives data by the second wireless communication, outputs a communication status signal (502) indicating a signal pattern according to the communication status of the second wireless communication, and outputs the communication status signal (502). The first wireless communication unit determines whether or not the second wireless communication is synchronous communication by analyzing the signal pattern of the communication status signal, and if the determination result is synchronous communication, the first wireless communication unit determines whether or not the second wireless communication is synchronous communication. Data is transmitted and received during the non-communication period (302) during which communication in the synchronous communication is not performed in synchronization with the communication timing of the synchronous communication.

Synchronous communication methods are mainly adopted for voice data communication such as music and voice calls, which require higher quality communication. Therefore, the wireless communication device of item 1 determines whether or not the second wireless communication is synchronous communication, and if it is synchronous communication, the first wireless communication unit is the second wireless. By synchronizing with communication, wireless communication is performed during the non-communication period of synchronous communication. As a result, it is possible to prevent power interference between the first wireless communication and the second wireless communication, and it is possible to prevent the occurrence of frame loss or the like due to the interference. Further, by analyzing the signal pattern of the communication state signal output by the second wireless communication device, it is possible to easily determine whether or not the second wireless communication is synchronous communication, and It can be synchronized with the communication timing. Further, for example, in the method of uniformly performing the first wireless communication and the second wireless communication in a time-division manner, the second wireless communication is performed in the period allocated as the period of the second wireless communication. Even if there is no such case, the first wireless communication cannot be performed, but the wireless communication device of item 1 detects and synchronizes the communication timing of the synchronous communication of the second wireless communication, and sets a non-communication period. Allocate as the period during which the first wireless communication is possible. As a result, it is possible to suppress a decrease in throughput as compared with the case where communication is performed uniformly in a time-division manner.

[2] (Communication control is performed by discriminating the communication pattern (asynchronous)) In the wireless communication device of item 1, the first wireless communication unit determines whether or not the second wireless communication is asynchronous communication by analyzing the signal pattern of the communication status signal, and determines. When the result is asynchronous communication, the data transmission / reception mode is determined according to the communication environment with the first wireless opposite device (10) which is the communication target of the first wireless communication unit .

For example, when one wireless communication is performed in a short distance and the other wireless communication is performed in a long distance, the communication performed in a long distance has a large attenuation of received power, so that the influence of power interference is large. Become bigger. On the contrary, when the other wireless communication is performed in a short distance, the amount of attenuation of the received power is small, so even if power interference is received, the degree of influence tends to be small. Therefore, the wireless communication device of item 2 selects a data transmission / reception mode suitable for the communication environment at that time by determining the communication environment between the first wireless communication unit and the first wireless opposite device. can do.

[3] (Determination of communication environment) In the wireless communication device of item 2, the first wireless communication unit measures the received signal strength or received signal quality of the first wireless communication, and the measured received signal strength or received signal quality is more than a predetermined threshold value. If it is large, it is determined that the communication environment is good, and if it is not, it is determined that the communication environment is bad.

According to this, it is possible to easily determine whether the communication environment is good or bad.

[4] (Communication control according to the communication environment during asynchronous communication) In the wireless communication device of item 3, the first wireless communication unit asserts the notification signal (501) when performing the first wireless communication, and the second wireless communication unit asserts the notification signal. If so, the second wireless communication is stopped. Further, when the determination result is asynchronous communication and the first wireless communication unit determines that the communication environment is bad, the first wireless communication unit time-divides the first wireless communication and the second wireless communication. When the notification signal is controlled as in the above and it is determined that the communication environment is good, data is transmitted when the second wireless communication is not performed.

According to this, when the communication environment is bad, for example, when the first wireless communication is performed over a long distance, the communication is performed by performing the first wireless communication and the second wireless communication in a time division manner. It is possible to reduce the occurrence of frame loss by preventing the influence of interference between them. Further, when the communication environment is good, for example, when the first wireless communication is performed in a short distance, the influence of power interference tends to be small, so that the communication status with each other is not the time-division communication method. By adopting a method of communicating according to the above, it is possible to perform communication while suppressing a decrease in throughput.

[5] (During synchronous communication of BT, transmission from AP is stopped) In the wireless communication device according to any one of Items 1 to 4, the first wireless communication unit further, when the determination result is synchronous communication, the communication period in the synchronous communication is the first wireless opposite. Instructs to stop transmitting data from the device.

As described above, in the wireless communication devices of Items 1 to 4, when the second wireless communication is synchronous communication, the first wireless communication unit receives data during the non-communication period of the synchronous communication. Send. However, even if the data transmission from the first wireless communication unit is stopped during the second wireless communication, the data transmission may be performed from the first wireless opposite device, and the second wireless communication may be performed. It may affect wireless communication. Therefore, when the second wireless communication is performed by synchronous communication, not only the data transmission from the first wireless communication unit but also the data transmission from the first wireless opposite device is stopped. Therefore, it is possible to prevent communication interference.

[6] (Stop transmission from AP if BT asynchronous communication and communication environment is bad) In the wireless communication device according to any one of Items 2 to 5, if the first wireless communication unit further determines that the determination result is asynchronous communication and the communication environment is poor, the second item. When wireless communication is performed, an instruction is given to stop transmission of data from the first wireless opposite device.

As described above, data may be transmitted from the first wireless opposite device even during the second wireless communication, and in that case, if the communication environment of the first wireless communication is poor, the first There is a possibility that the first wireless communication unit cannot receive the data transmitted from the wireless opposite device of 1. Therefore, by limiting the data transmission from the first wireless opposite device in a situation where the communication environment of the first wireless communication is bad, the occurrence of frame loss of the transmitted data from the first wireless opposite device is generated. Can be reduced.

[7] (Transmission control by sleep signal) In the wireless communication device of item 5 or 6, the instruction to stop the transmission of the data sends a sleep signal (power saving notification) indicating that the first wireless communication unit shifts to the power saving state to the first wireless. This is done by transmitting to the opposite device.

According to this, the transmission of data from the first wirelessly opposed device can be easily stopped. For example, when the first wireless communication is an IEEE 802.11 standard wireless system, an existing protocol (power saving notification function) may be used, and a new protocol for instructing the stop of the data transmission is prepared. No need.

[8] (Priority signal) In the wireless communication device according to any one of Items 3 to 7, the second wireless communication unit further indicates that the second wireless communication is performed in preference to the first wireless communication (503). Is output, and when the determination result is asynchronous communication and the communication environment is determined to be good, the first wireless communication unit transmits data when the priority signal is asserted. Not performed.

According to this, even if the second wireless communication and the first wireless communication compete with each other in a situation where communication control is performed according to each other's communication status, the second wireless communication Can be prioritized for communication.

[9] (Communication control is performed by determining the communication pattern (congestion state)) In the wireless communication device according to any one of Items 2 to 8, in the first wireless communication unit, the second wireless communication is in a congested state before the determination of the synchronous communication and the determination of the asynchronous communication. Whether or not it is determined, and if the second wireless communication is in a congested state, data transmission / reception is stopped.

[10] (Communication control is performed by determining the communication pattern (unused state)) In the wireless communication device according to any one of Items 1 to 9, the first wireless communication unit determines whether or not the second wireless communication is performed, and the second wireless communication is not performed. In that case, data is transmitted and received at a desired timing.

According to this, in the situation where the second wireless communication is not performed, the first wireless communication unit can transmit and receive data at a desired timing, and therefore, for example, it is uniformly assigned to time division. Throughput does not decrease compared to the method of communicating at the timing.

[11] (Method of determining signal pattern) In the wireless communication device of Item 10, the communication status signal is a digital signal having a first value when communicating and a second value when not communicating. Further, the first wireless communication unit determines that the second wireless communication is not performed when the communication status signal does not reach the first value within a predetermined period, and determines that the second wireless communication is not performed, and the predetermined period. When the total time of the period in which the communication status signal is the first value is equal to or longer than a predetermined time, it is determined that the second wireless communication is in a congested state, and within the predetermined period, the said When the same signal pattern based on the period of the first value of the communication status signal and the period of the second value is detected multiple times, it is determined that the second wireless communication is synchronous communication. , In cases other than the above, it is determined that the second wireless communication is asynchronous communication.

According to this, the communication state of the second wireless communication can be easily determined.

[12] (Wireless communication device (independent) that stops transmission from the AP during BT communication) The wireless communication device (100) according to another typical embodiment of the present invention includes a first wireless communication (WLAN communication) using the first frequency band and at least a part of the first frequency band. It is a wireless communication device that performs a second wireless communication (BT communication) using a second frequency band in which is overlapped, and in the case of performing the second wireless communication, it is a communication target by the first wireless communication. Instructs to stop transmitting data from a certain wireless opposite device (10).

According to this, as described above, since the communication in the situation where the frame loss of the transmission data from the first wireless opposite device is likely to occur is restricted, the first one due to the interference of the second wireless communication is restricted. It is possible to reduce the occurrence of frame loss of transmission data from the wirelessly opposed device, and it is possible to prevent interference due to data transmission from the first wirelessly opposed device with respect to the second wireless communication.

[13] (Transmission control by sleep signal) In the wireless communication device of item 12, the instruction to stop the transmission of the data is given by transmitting a sleep signal (power saving notification) indicating the transition to the power saving state to the wireless opposite device.

According to this, it is possible to easily stop the transmission of data from the first wirelessly opposed device as in Item 7.

[14] (Wireless communication device that determines the communication pattern and controls communication (independent)) The wireless communication device (100) according to another typical embodiment of the present invention is a first wireless communication unit (1) for performing a first wireless communication (WLAN communication) using the first frequency band. ) And a second wireless communication unit (2) for performing a second wireless communication (BT communication) using a second frequency band in which at least a part of the first frequency band overlaps. The second wireless communication unit transmits / receives data by the second wireless communication, and is set to a first value when communicating and a second value when not communicating. Outputs the status signal (502). Further, the first wireless communication unit analyzes the signal pattern of the communication status signal within the predetermined period, and if the communication status signal does not reach the first value within the predetermined period, the first wireless communication unit analyzes the signal pattern. If it is determined that the wireless communication of 2 is not performed and the total time of the period in which the communication status signal is the first value is equal to or longer than the predetermined time in the predetermined period, the second wireless communication is performed. When it is determined that the state is congested and the same signal pattern based on the period of the first value and the period of the second value of the communication state signal is detected a plurality of times within the predetermined period. The second wireless communication is determined to be synchronous communication, and in cases other than the above, the second wireless communication is determined to be asynchronous communication, and the operation mode for data transmission / reception is set according to the determination result. decide.

According to this, the communication state of the second wireless communication can be easily determined, and the operation mode of data transmission / reception in the first wireless communication can be easily determined.

[15] (Determination of communication environment) In the wireless communication device of item 14, the first wireless communication unit measures the received signal strength or the received signal quality of the first wireless communication when it is determined to be the asynchronous communication, and the measured received signal. When the strength or the received signal quality is larger than a predetermined threshold value, it is determined that the communication environment is good, and when it is not, it is determined that the communication environment is bad.

According to this, it is possible to easily determine whether the communication environment is good or bad, and it is possible to easily change the operation mode according to the communication environment.

[16] (Resume data transmission from AP by notification of power saving cancellation) In the wireless communication device according to any one of Items 7 to 11, the first wireless communication unit starts communication by transmitting a signal notifying the cancellation of power saving to the first wireless opposite device. ..

According to this, the communication from the first wireless opposite device to the wireless communication device can be easily restarted.

[17] (Resume data transmission from AP by frame acquisition request) In the wireless communication device according to any one of Items 7 to 11, the first wireless communication unit starts communication by transmitting a signal for requesting frame acquisition to the first wireless opposite device. To do.

According to this, the communication from the first wireless opposite device to the wireless communication device can be easily restarted.

[18] (Second frequency band where at least a part of the first frequency overlaps) The wireless communication device (100) according to another typical embodiment of the present invention includes a first wireless communication unit for performing a first wireless communication using a first frequency band, and the first wireless communication unit. It has a second wireless communication unit for performing a second wireless communication using a second frequency band in which at least a part of the frequency bands overlaps. The second wireless communication unit transmits / receives data by the second wireless communication, outputs a communication status signal (502) indicating a signal pattern according to the communication status of the second wireless communication, and outputs the communication status signal (502). The first wireless communication unit determines whether or not the second wireless communication is synchronous communication by analyzing the signal pattern of the communication status signal, and if the determination result is synchronous communication, the first wireless communication unit determines whether or not the second wireless communication is synchronous communication. Data is transmitted and received during the non-communication period (302) during which communication in the synchronous communication is not performed in synchronization with the communication timing of the synchronous communication.

According to this, as in Item 1, it is possible to prevent power interference between the first wireless communication and the second wireless communication, and it is possible to prevent the occurrence of frame loss or the like due to the interference. In addition, it is possible to easily determine whether or not the second wireless communication is synchronous communication, and it is possible to synchronize with the communication timing. Further, according to the wireless communication device of Item 18, as in Item 1, it is possible to suppress a decrease in throughput as compared with the case where communication is uniformly performed in a time-division manner.

2. Details of the embodiment The embodiments will be described in more detail.

&lt;&lt; Embodiment 1 &gt;&gt; FIG. 1 is an explanatory diagram showing an outline of a wireless communication terminal according to the first embodiment.

The wireless communication terminal 100 (hereinafter, also simply referred to as terminal) shown in the figure is a mobile terminal such as a mobile phone or a smartphone, and has a first wireless communication using a predetermined frequency band and a predetermined frequency band. Perform a second wireless communication using the frequency band. The frequency bands used by the first wireless communication and the second wireless communication may be different frequency bands from each other, may be close to each other, or at least a part of the frequency bands may be used. The frequency bands may overlap. Here, for example, the first wireless communication is defined as IEEE 802.11 standard wireless communication using the 2.4 GHz band (hereinafter, also referred to as WLAN communication), and the second wireless communication is also referred to as the 2.4 GHz band. It will be described as wireless communication of the IEEE 802.11 standard using the above (hereinafter, also referred to as "Bluetooth (Bluetooth) (BT) communication").

The terminal 100 includes a wireless device 1 and a wireless device 2. The wireless device 1 performs WLAN communication with the wireless opposite device (Access Point (AP)) 10 installed within a communicable range via the antenna 3. On the other hand, the wireless device 2 performs BT communication with the wireless opposite device 20 installed within a communicable range via the antenna 4. The wirelessly opposed device 20 is, for example, wireless headphones or the like.

The wireless device 1 and the wireless device 2 are arranged adjacent to each other in the terminal 100, and the wireless devices 1 and 2 are connected by a signal line 5. There are two types of connection methods for each of the wireless devices 1 and 2, for example, a two-wire control method in which two signal lines are connected and a three-wire control method in which three signal lines are connected.

2 and 3 are explanatory views showing an example of a connection method between the wireless device 1 and the wireless device 2.

FIG. 2 shows the case where the wireless device 1 and the wireless device 2 are connected by two signal lines, and FIG. 3 shows the case where the wireless device 1 and the wireless device 2 are connected by three signal lines. The case is shown.

When connected by two signal lines as shown in FIG. 2, for example, the output port 15 of the wireless device 1 and the input port 24 of the wireless device 2 are connected by the signal line 501, and the signal line 501 is connected to the wireless device. A signal indicating the communication status of the WLAN communication of 1 (hereinafter, referred to as "communication status signal 501") is output. Further, the output port 25 of the wireless device 2 and the input port 14 of the wireless device 1 are connected by a signal line 502, and the signal line 502 is a signal indicating the communication status of the BT communication of the wireless device 2 (hereinafter, "communication status signal 502"). "Is called.) Is output. Through these connections, the wireless device 1 and the wireless device 2 can know each other's communication status.

On the other hand, when connected by three signal lines as shown in FIG. 3, in addition to the connection by the signal lines 501 and 502 described above, the output port 26 of the wireless device 2 and the input port 16 of the wireless device 1 are signals. It is connected by line 503, and a signal indicating the priority of BT communication of the wireless device 2 (hereinafter, referred to as "priority signal 503") is output to the signal line 503. The priority signal 503 is a digital signal indicating low priority and high priority, and is used in priority control described later. In the following description, as an example, the terminal 100 will be described assuming that the wireless device 1 and the wireless device 2 are connected by a three-wire control method.

FIG. 4 is a block diagram showing an example of the internal configuration of the terminal 100.

The radio frequency device 1 (WLAN) includes a condition monitoring unit 12, a communication control unit 13, and an RF unit 11. The condition monitoring unit 12 and the communication control unit 13 are functional units realized by, for example, a microprocessor that executes program processing, and are realized by, for example, an LSI for baseband processing.

The status monitoring unit 12 inputs the priority signal 503 output to the signal line 503 by the wireless device 2 and the communication status signal 502 output to the signal line 502, and determines the communication status of the wireless device 2 based on the input signal. The discrimination is performed, and the discrimination result is given to the communication control unit 13. The details of the determination method will be described later.

The communication control unit 13 includes, for example, a transmission / reception control unit 132, a usage status notification unit 131, and a communication environment measurement unit 133. The usage status notification unit 131 outputs a communication status signal 501 indicating the communication status of the WLAN communication by the wireless device 1 under the control of the transmission / reception control unit 132. The communication status signal 501 is a digital signal. For example, when the wireless device 1 is performing WLAN communication, the signal level is set to high, and when the wireless device 1 is not performing WLAN communication, the signal level is set to low. Low).

The communication environment measurement unit 134 measures the received signal strength or the received signal quality for each frame received via the antenna 3, and determines the communication environment of the WLAN communication based on the measured received signal strength or the received signal quality. , Monitor the communication environment between the wireless device 1 and the wireless opposite device 10. The received signal strength is an index showing the magnitude of the received signal including noise and the like. If the frame signal expected to be received is strong, reception is possible even if there is noise. Moreover, even if only noise is used, the received signal strength becomes high. The same applies not only to noise but also to interference signals and the like. The received signal quality is an index showing the signal quality of a desired frame, and is represented by, for example, the ratio (SNR: Signal to Noise ratio) between the frame signal expected to be received and the noise signal. Even if the frame signal is weak, reception is possible if the noise is also weak. In addition to SNR, there are also SIR (Signal to Interference Ratio) and D / U ratio.

Figure 5 exemplifies the types of discrimination for the communication environment of WLAN communication.

As shown in the figure, the communication environment between the wireless device 1 and the wireless opposite device 10 is roughly classified into two types, for example, short-distance and long-distance. In general, the received signal strength or received signal quality or communication quality is inversely proportional to the communication distance. Therefore, here, when the received signal strength or received signal quality is high, the distance is set to short distance, and when the received signal strength or received signal quality is low, the distance is set. Suppose it is a long distance.

FIG. 6 is a flow chart showing an example of the determination process of the communication environment of WLAN communication.

First, the communication environment measurement unit 134 acquires the received data for each frame from the RF unit 11 via the antenna 3 (S201). The communication environment measurement unit 134 measures the received signal strength or the received signal quality based on the acquired received data (S202). Then, it is determined whether or not the measured received signal strength or received signal quality is larger than a predetermined threshold value (S203). When the received signal strength or the received signal quality is larger than a predetermined threshold value, the communication environment measuring unit 134 determines that the communication environment of the WLAN communication is a short distance (S204). On the other hand, when the received signal strength or the received signal quality is smaller than a predetermined threshold value, the communication environment measuring unit 134 determines that the communication environment of the WLAN communication is a long distance (S205).

The transmission / reception control unit 132 controls the transmission / reception of data via the antenna 3 and the RF unit 11 based on the determination result of the communication state of the wireless device 2 by the condition monitoring unit 12 and the communication environment measurement result by the communication environment measurement unit 133. At the same time, the communication of the wireless device 2 is controlled by controlling the usage status notification unit 131. The details of communication control by the transmission / reception control unit 132 will be described later.

The RF unit 11 inputs the received signal from the antenna 3, converts the input received signal into a frequency and amplitude that can be processed by the communication control unit 13 in the subsequent stage, and outputs the input signal. Further, the transmission signal generated by the communication control unit 13 is converted into a frequency and amplitude that can be transmitted by the antenna 3 and output. The RF unit 11 may be, for example, a 1-chip RFIC (Radio-Frequency Integrated Circuits), or may be configured as a 1-chip system LSI including a status monitoring unit 12 and a baseband unit of the communication control unit 13. Good.

The wireless device 2 includes a condition monitoring unit 22, a communication control unit 23, and an RF unit 21. The condition monitoring unit 22 and the communication control unit 23 are functional units realized by, for example, a microprocessor that executes program processing, and are realized by, for example, an LSI for baseband processing.

The state monitoring unit 22 inputs the communication status signal 501 output by the wireless device 1, and determines whether or not the wireless device 1 is communicating based on the input signal. For example, when the communication status signal 501 is high, it is determined that the wireless device 1 is communicating, and when it is low, it is determined that the wireless device 1 is not communicating. The determination result is given to the communication control unit 23.

The communication control unit 23 includes, for example, a transmission / reception control unit 232, a usage status notification unit 231 and a priority notification unit 233. The usage status notification unit 231 outputs a communication status signal 502 indicating the communication status of BT communication by the wireless device 2 under the control of the transmission / reception control unit 232. The communication status signal 502 is output, for example, at a timing earlier than the timing at which communication is actually started (for example, a timing several μs earlier). The details of the communication status signal 502 will be described later.

The priority notification unit 233 outputs a priority signal 503 requesting that the BT communication by the wireless device 2 be prioritized over the WLAN communication under the control of the transmission / reception control unit 232. The priority signal 503 is given high priority when, for example, is high, and indicates that priority communication for BT communication is requested. The priority signal 503 is used in communication control according to the priority described later.

The transmission / reception control unit 232 controls the transmission of data via the antenna 4 and the RF unit 21 based on the determination result by the condition monitoring unit 22, and also controls the usage status notification unit 231 and the priority notification unit 233. The communication status signal 502 and the priority signal 503 are output. For example, the transmission / reception control unit 232 does not perform BT communication when the wireless device 1 is communicating, and performs BT communication at a desired timing when the wireless device 1 is not communicating.

The RF unit 21 inputs the received signal from the antenna 4, converts the input received signal into a frequency and amplitude that can be processed by the communication control unit 23 in the subsequent stage, outputs the signal, and is generated by the communication control unit 23. The transmission signal is converted into a frequency and amplitude that can be transmitted by the antenna 4 and output. The RF unit 21 may be, for example, a one-chip RF IC like the RF unit 11 described above, or may be configured as a one-chip system LSI including the condition monitoring unit 22 and the baseband unit of the communication control unit 23. You may.

Here, a method of determining the communication state of BT communication by the state monitoring unit 12 of the wireless device 1 will be described.

FIG. 7 is an explanatory diagram showing an example of the communication state of the BT communication of the wireless device 2.

As shown in the figure, the communication state of BT communication is divided into four types, for example, an unused state, a congested state, a synchronous communication, and an asynchronous communication. The unused state is a state in which BT communication is not performed in the wireless device 2. The congested state is a state in which BT communication is frequently performed in the wireless device 2 and the communication is congested. Synchronous communication is a state in which synchronous communication is performed in which communication is performed at a fixed cycle and a fixed time width. Asynchronous communication is not synchronous communication and is not performed so frequently as to be crowded, but it is in a state where communication is performed.

The above four states are determined by the state monitoring unit 12 analyzing the communication state signal 502.

FIG. 8 is an explanatory diagram showing an example of the communication status signal 502 output from the wireless device 2.

As shown in the figure, the communication status signal 502 is output as a digital signal, the high section indicates that BT communication is being performed, and the low section is that BT communication is not being performed. Represents. The state monitoring unit 12 acquires, for example, statistics on the rise and fall changes of the communication state signal 502 within a predetermined time T1, and determines the communication state of the wireless device 2 based on the acquired statistical information. The measurement of the statistical information for each time T1 is performed n times (n is an integer of 1 or more). Further, the statistical information acquired by the condition monitoring unit 12 is stored in a storage area such as a memory (not shown). Here, in order to facilitate the explanation, a specific determination method will be described in detail with the number of measurements n = 1.

For example, if there is no change in the rising edge of the communication status signal 502 within the time T1 and there is no high section, it is determined to be in the unused state. Further, when the total time when the signal level is high at time T1 exceeds a predetermined threshold value, it is determined to be in a congested state. The predetermined threshold value is not particularly limited, but is, for example, a time that is 80% of the time T1.

When the communication status signal 502 is the signal pattern of the synchronous communication at the time T1, it is determined that the communication is the synchronous communication. Figure 9 shows an example of the signal pattern of synchronous communication. As shown in the figure, in synchronous communication, a signal pattern having the same period (I1 + I2) and high section I1 is repeated. Therefore, the state monitoring unit 12 determines the synchronism based on the high section I1 from the rising edge to the falling edge of the communication status signal 502 and the low section I2 from the falling edge to the next rising edge. That is, when a signal pattern having the same high section (I1) and the same period (I1 + I2) is detected m (m is an integer of 2 or more) times, BT communication is considered to be synchronous communication. to decide.

If none of the above three states is applicable, the state monitoring unit 12 determines that the communication is asynchronous.

FIG. 10 is a flow chart showing an example of the communication state determination process of the wireless device 2.

The status monitoring unit 12 starts measuring the communication status signal 502 and acquires the statistical information of the communication status signal 502 for a predetermined time T1 (S101). Then, it is determined whether or not the number of measurements is n times (S102), and if the measurement is not performed n times, the measurement is performed again and the statistical information is acquired. When the number of measurements reaches n, the acquired statistical information is analyzed to determine the presence or absence of a high section within time T1 (S103). When it is determined that there is no high section, the condition monitoring unit 12 determines that the wireless device 2 is in an unused state (S104). On the other hand, when it is determined in step 103 that there is a high section, the condition monitoring unit 12 determines whether or not the total time of the high section exceeds the predetermined threshold value (S105). When the total time of the high section exceeds the predetermined threshold value, the condition monitoring unit 12 determines that the BT communication is in a congested state (S106). On the other hand, in step 105, when the total time of the high section does not exceed the predetermined threshold value, the condition monitoring unit 12 determines the presence / absence of the signal pattern of the synchronous communication (S107). When the signal pattern of the synchronous communication is detected by the method described above, the condition monitoring unit 12 determines that the BT communication is the synchronous communication (S108). On the other hand, if the signal pattern of the synchronous communication is not detected, the condition monitoring unit 12 determines that the BT communication is the asynchronous communication (S109).

Next, a communication control method by the communication control unit 13 will be described.

As described above, the transmission / reception control unit 132 of the communication control unit 13 controls the transmission / reception of data and the communication of the wireless device 2 based on the determination result of the BT communication by the condition monitoring unit 12. The specific control method according to the discrimination result of BT communication is as follows.

(1) When the determination result of the communication status of the wireless device 2 is in the unused state When the determination result of the communication state of the wireless device 2 is an unused state, the transmission / reception control unit 132 performs WLAN communication at a desired timing. That is, in this case, even if the WLAN communication is performed, the BT communication is neither affected nor affected, so that the wireless device 2 performs the communication at the desired timing.

(2) When the determination result of the communication status of the wireless device 2 is in a congested state When the determination result of the communication state of the wireless device 2 is a congested state, the transmission / reception control unit 132 does not perform WLAN communication. When the communication state of the wireless device 2 is congested, the BT communication must occupy the communication. In this situation, if the WLAN communication and the BT communication are controlled to be performed in a time-division manner, the throughput of the BT communication is lowered, which is not appropriate. Therefore, the transmission / reception control unit 132 does not perform WLAN communication until the congestion state of BT communication is cleared.

(3) When the determination result of the communication status of the wireless device 2 is synchronous communication When the communication status determination result by the wireless device 2 is synchronous communication, the transmission / reception control unit 132 sets the data transmission timing from the wireless device 1 so that WLAN communication is performed during the non-communication period in the synchronous communication of BT communication. In addition to making adjustments, the timing of data transmission from the wireless opposite device (AP) 10 is adjusted.

First, the adjustment of the data transmission timing from the wireless device 1 will be described. FIG. 11 illustrates a method of adjusting the data transmission timing of the wireless device 1.

In the figure, the upper half of the figure shows the communication timing in BT communication, and the lower half of the figure shows the communication timing in WLAN communication. Reference numerals 31A and 31B represent data transmitted from the wireless device 2, and reference numerals 32A and 32B represent data transmitted from the wireless opposite device 20. Further, reference numerals 33A and 33B represent data transmitted from the wireless device 1, and reference numerals 34A and 34B represent data transmitted from the wireless opposite device 10. Further, the periods of reference numerals 301 and 303 are communication periods in synchronous communication of BT communication, and the periods of reference numeral 302 are non-communication periods in synchronous communication of BT communication.

When the discrimination result received from the condition monitoring unit 13 is synchronous communication, as shown in FIG. 11, the transmission / reception control unit 132 detects the communication timing of the synchronous communication and synchronizes with that timing. Controls to perform WLAN communication during the non-communication period 302 in synchronous communication of BT communication. According to this, as compared with the case where WLAN communication and BT communication are uniformly performed in a time-division manner, the period during which communication is not performed can be effectively used, so that a decrease in throughput can be further suppressed.

The transmission / reception control unit 132 controls the data transmission timing from the wireless device 1 as described above, but also controls the data transmission timing from the wireless opposite device (AP) 10. The control of the data transmission timing from the wireless opposing device 10 is performed, for example, by transmitting a power saving notification indicating that the wireless device 1 shifts to the power saving state (sleep state) to the wireless opposing device 10.

Here, the power saving function of the wireless device 1 will be described. The wireless device 1 has a power saving function that shifts to a power saving state when data is not transmitted or received for a certain period of time. The wirelessly opposed device (AP) 10 needs to know whether or not the wireless device 1 is in a power saving state. The transition to the power saving state of the wireless device 1 and the recovery from the power saving state are determined by, for example, the information on the power saving state of the wireless device 1 included in the header of the transmission frame transmitted from the wireless device 1 to the wireless opposite device 10. You will be notified. Hereinafter, the notification of the transition to the power saving state based on the information is referred to as the power saving notification, and the notification of the return from the power saving state is referred to as the power saving cancellation notification.

When the wireless opposite device 10 receives the power saving notification from the wireless device 1, the data to be transmitted to the wireless device 1 (hereinafter, also referred to as a transmission frame) is stored in the buffer or the like in the wireless opposed device 10 for an allowable time. .. Further, the wirelessly opposed device 10 transmits a beacon frame including identification information at a fixed cycle (for example, about 100 ms). The beacon frame contains management information indicating whether or not the wirelessly opposed device 10 has accumulated the transmission frame of the wireless device 1. Therefore, the wireless device 1 can determine the presence or absence of the accumulated transmission frame addressed to its own device by receiving the beacon frame transmitted periodically. Since the transmission time of the beacon frame is sufficiently shorter than the transmission time of the user data, the influence of power interference due to the transmission of the beacon frame is small. Further, the management information and other control information included in the beacon frame are not data to be transmitted in response to a request from a user or the like.

When the wireless device 1 acquires a frame stored in the wireless opposite device 10, for example, the wireless device 1 transmits a frame acquisition request to the wireless opposite device 10. As a result, the wirelessly opposed device 10 is permitted to transmit to the wireless device 1, and the wirelessly opposed device 10 transmits one storage frame while maintaining the power saving state. When acquiring multiple frames, request frame acquisition multiple times. Alternatively, when the wireless device 1 issues a power saving release notification to the wireless opposing device 10 and cancels the power saving state, the wireless opposing device 10 transmits all the accumulated frames. If the transmission timing of the beacon frame transmitted from the wireless opposite device 2 at a fixed cycle and the timing of the synchronous communication of the wireless device 1 overlap, the wireless device 2 may not be able to receive the beacon frame, but the beacon frame is constant. Even when the number of times cannot be received, the wireless device 2 can confirm the presence or absence of accumulated frames on the wireless opposite device 2 by transmitting a frame acquisition request to the wireless opposite device 2.

Using this function, the communication control unit 13 transmits a power saving notification to the wireless opposite device 10 when the wireless device 2 starts BT communication, and makes a frame acquisition request when the wireless device 1 starts WLAN communication. It transmits to the wireless opposite device 10. Alternatively, when the wireless device 2 starts the BT communication, the power saving notification is transmitted to the wireless opposing device 10, and when the wireless device 1 starts the WLAN communication, the power saving cancellation notification is transmitted to the wireless opposing device 10. According to this, as shown in FIG. 11, during the periods 301 and 303 in which the wireless device 2 performs BT communication, data is not transmitted from the wireless opposite device 10, and the data is in the period 302 in which the wireless device 1 performs WLAN communication. Since transmission is performed, it is possible to prevent the occurrence of frame loss or the like due to power interference due to BT communication in the transmitted data from the wirelessly opposed device 10. In particular, the above control method is effective because higher quality communication is required for voice data communication such as music and voice communication in which synchronous communication is used. As described above, by grasping the non-communication section of the synchronous communication in the BT communication, it is possible to improve the mutual communication quality at the time of the synchronous communication of the BT communication.

(4) When the determination result of the communication status of the wireless communication device 2 is asynchronous communication When the determination result of the communication status of the wireless device 2 is asynchronous communication, the transmission / reception control unit 132 determines the communication status of the wireless device 2 notified from the status monitoring unit 12 and the communication environment of the wireless device 1. Determine the communication control method. Specifically, when the transmission / reception control unit 132 determines the communication status of the wireless device 2 notified from the condition monitoring unit 12 is asynchronous communication, the communication environment measurement unit 133 informs the communication environment of the WLAN communication. Get the discrimination result of. Then, the communication control method is determined depending on whether the communication environment is a short distance or a long distance.

First, a case where the communication environment is a long distance will be described.

When the BT communication by the wireless device 2 is asynchronous communication and the communication environment of the WLAN communication is a long distance, the transmission / reception control unit 132 divides the BT communication by the wireless device 1 and the WLAN communication by the wireless device 2 in a time division manner. Control to do. Hereinafter, the time division control will be described in detail with reference to FIGS. 12 and 13.

FIG. 12 shows an example of data transmission timing when BT communication by the wireless device 1 and WLAN communication by the wireless device 2 are performed in a time-division manner. In the figure, the upper half of the figure shows the communication timing in BT communication, and the lower half of the figure shows the communication timing in WLAN communication. Reference numerals 35A to 35D represent data transmitted from the wireless device 1, and reference numerals 36A and 36B represent data transmitted from the wireless opposite device 10. Further, reference numerals 37A to 37C represent data transmitted from the wireless device 2, and reference numerals 38A to 38C represent data transmitted from the wireless opposite device 20. Further, the period of reference numeral 304 is the communicable period allocated to WLAN communication in time division, and the period of reference code 305 is the communicable period allocated to BT communication in time division.

FIG. 13 is a flow chart showing an example of a control method for performing BT communication and WLAN communication in a time-division manner.

The transmission / reception control unit 132 controls the usage status notification unit 131 at the timing of time t0 in FIG. 12, for example, when the determination result of the communication environment of the WLAN communication received from the communication environment measurement unit 133 is a short distance. The communication status signal 501 is asserted, and the frame including the power saving release notification is transmitted to the wireless opposite device 10 (S301). The power saving cancellation notice may be transmitted including the power saving cancellation notice in the first transmission frame 35A in FIG. 12, for example. As a result, the wireless device 2 stops the BT communication, and the wireless opposite device 10 can transmit data. After that, WLAN communication is started between the wireless device 1 and the wireless opposite device 10 (S302). Then, the WLAN communication is continued until the predetermined time is reached (S303). The predetermined time is a communicable time 304 allocated to WLAN communication in time division control, and for example, the value is set in advance in a register or the like in the communication control unit 13. Similarly, the value of the communicable time 305 assigned to the BT communication is also set in the register or the like. The transmission / reception control unit 132 allocates the communication time of BT communication and WLAN communication to time division by referring to the value of the register or the like.

The transmission / reception control unit 132 controls the usage status notification unit 131 at the timing t1 when the communication available time 304 has elapsed to negate the communication status signal 501, and transmits a frame including the power saving notification to the wireless opposite device 10. (S304). The power saving notification may be transmitted including the power saving notification in the final transmission frame 35D in FIG. 12, for example. As a result, the wireless device 2 enables BT communication, and the wireless opposite device 10 stops transmitting data. After that, the wireless device 2 starts BT communication (S305). During that time, the transmission / reception control unit 132 measures the elapsed communication time 305 assigned to the BT communication (S306). Then, the transmission / reception control unit 132 controls the usage status notification unit 131 at the timing t2 when the communication available time 305 has elapsed to assert the communication status signal 501, and transmits the power saving release notification to the wireless opposite device 10. (S301). As a result, the wireless device 2 stops the BT communication, and the wireless opposite device 10 can transmit data. By repeating the above processing, the communication between the wireless device 1 and the wireless device 2 is performed in a time-division manner.

If the data transmission from the wireless opposite device 10 (data reception of the wireless device 1) is not controlled, the data may be transmitted from the wireless opposite device 10 during the communication of the wireless device 2. Further, when the distance between the wireless device 1 and the wireless opposite device 10 is long, the influence of power interference becomes more remarkable, so that frame loss is likely to occur. Therefore, frame loss is likely to occur in the data transmitted from the wireless opposite device 10 during the communication of the wireless device 2. Therefore, in the present embodiment, when the BT communication is asynchronous communication and the communication environment of the WLAN communication is a long distance, the data transmission from the wireless device 1 and the wireless device 2 is performed by dividing the data by time division. , The transmission of data from the wireless opposite device 10 is stopped during the period during which the wireless device 2 can perform BT communication. As a result, interference due to mutual communication is prevented, so that the communication quality of each can be maintained high, and the occurrence of frame loss in the transmission data from the wirelessly opposed device 10 can be reduced.

Next, a case where the communication environment is a short distance will be described.

When the BT communication by the wireless device 2 is asynchronous communication and the communication environment of the WLAN communication is a short distance, the transmission / reception control unit 132 gives priority according to the communication status signal 502 and the priority signal 503 of the wireless device 2. Take control. For example, when the communication timing of BT communication by the wireless device 1 and the communication timing of the WLAN communication by the wireless device 2 overlap, the status monitoring unit 13 determines whether or not the communication of the WLAN communication by the wireless device 2 can be continued according to the priority signal 503. It is determined and instructed to the transmission / reception control unit 132. Specifically, when the priority signal 503 is asserted (when the priority is high), the condition monitoring unit 13 instructs the transmission / reception control unit 132 to stop the WLAN communication of the wireless device 2. On the other hand, when the priority signal 503 is not asserted (when the priority is low), the condition monitoring unit 13 instructs the transmission / reception control unit 132 to continue the WLAN communication of the wireless device 2. The status monitoring unit 13 may determine whether or not communication can be continued, or the transmission / reception control unit 132 that receives the detection results of the communication status signal 502 and the priority signal 503 from the status monitoring unit 13. You may.

FIG. 14 is a flow chart showing an example of a communication control method according to the communication state and priority of the wireless device 2.

When the determination result of the communication environment of the WLAN communication received from the communication environment measurement unit 133 is a short distance, the transmission / reception control unit 132 first transmits a frame including the power saving release notification to the wireless opposite device 10 ( S401). The power saving cancellation notice may be transmitted by including the power saving cancellation notice in the initial transmission frame, as in FIG. 12, for example. As a result, data can be transmitted from the wirelessly opposed device 10. After that, the transmission / reception control unit 132 controls the WLAN communication based on the instruction from the condition monitoring unit 13 whether or not the communication can be continued (S402). The specific control method in step 402 is as follows.

FIG. 15 is an explanatory diagram showing an example of data transmission timing in communication according to the communication state and priority of the wireless device 2.

In the figure, after the power saving release notification, the transmission / reception control unit 132 controls the usage status notification unit 131 at the timing of time t0 to assert the communication status signal 501, and starts the WLAN communication. After that, when the wireless device 2 asserts the communication status signal 502 for BT communication at the timing t1 when the wireless device 1 is transmitting the data 401 by WLAN communication, the status monitoring unit 13 of the wireless device 1 changes. , The communication status signal 502 is detected and the priority signal 503 is determined. At this time, since the priority signal 503 is not asserted, the status monitoring unit 13 instructs the transmission / reception control unit 132 to continue the communication of the WLAN communication. Upon receiving the instruction, the transmission / reception control unit 132 continues to perform WLAN communication and continues to assert the communication status signal 501 of the wireless device 1. Since the communication status signal 501 is not negated, the wireless device 2 temporarily negates the previously asserted communication status signal 502 after a certain period of time, and does not perform BT communication. After that, when the data transmission of the wireless device 1 ends at time t2 and the communication status signal 501 of the wireless device 1 is negated, the wireless device 2 asserts the communication status signal 502 again and transmits the data 402 by BT communication. Start. Then, when the communication is completed at the time t3, the wireless device 2 negates the communication status signal 502. Further, during the period from time t2 to t3 when the wireless device 2 is communicating, the wireless opposite device 10 is permitted to transmit data by the above-mentioned power saving cancellation notification, so that the data 403 and 404 are sent to the wireless device 1. Send.

After that, the wireless device 1 starts WLAN communication again at time t4 and transmits data 405. Then, at the time t5 during transmission of the data 405, when the communication status signal 502 is asserted and the priority signal 503 is asserted to request BT communication for the wireless device 2 to perform communication, the status monitoring unit 13 of the wireless device 1 13 Detects the communication status signal 502 and determines the priority signal 503. At this time, since the priority signal 503 is asserted, the state monitoring unit 13 instructs the transmission / reception control unit 132 to stop data transmission. Upon receiving the instruction, the transmission / reception control unit 13 stops data transmission and negates the communication status signal 501. As a result, BT communication by the wireless device 2 is started, and data 406 is transmitted. The priority signal 503 is issued together with the communication status signal 502, but the issued ratio is set in advance in, for example, a register in the communication control unit 13, and the transmission / reception control unit 132 sets the priority signal according to the setting. Issue 503.

After that, when the BT communication of the wireless device 2 ends at time t6 and the communication status signal 502 and the priority signal 503 of the wireless device 2 are negated, the transmission / reception control unit 132 asserts the communication status signal 501 and data 407. To send. By the above processing, priority control is performed according to the communication state and priority of the wireless device 2.

When the distance between the wireless device 1 and the wireless opposite device 10 is short, the attenuation of the transmitted / received power in WLAN communication is relatively small, so even if power interference is received, the degree of influence is small and frame loss may occur. The sex is low. Therefore, in the present embodiment, when the BT communication is asynchronous communication and the communication environment of the WLAN communication is a short distance, even during the period when the wireless device 2 is performing the BT communication, the wireless opposite device 10 is used. Do not stop sending data. As a result, it is possible to suppress a decrease in throughput as compared with the case where data transmission from the wirelessly opposed device 10 is stopped during BT communication. Further, since the timing at which the wireless device 1 and the wireless device 2 perform their own communication is adjusted according to the mutual communication status, it is possible to suppress a decrease in throughput as compared with the case where the wireless device 1 and the wireless device 2 perform their own communication.

As described above, according to the wireless communication terminal 100 according to the present embodiment, the wireless device 1 that performs WLAN communication determines the communication status by analyzing the signal pattern of the communication status signal 502 of the BT communication by the wireless device 2. Since the communication control of WLAN communication and BT communication is performed based on the grasp, the occurrence of frame loss due to power interference is reduced, and the decrease in loopot is suppressed compared to the method of uniformly performing communication control in time division. Can be done. Further, if communication control is performed by the priority signal, if the timings of frame transmission of BT communication and WLAN communication collide, WLAN communication may be stopped by the priority signal of the wireless device 2 and frame loss may occur. However, unlike the present embodiment, the WLAN communication is performed during the non-communication period 302 instead of being uniformly controlled by the priority signal, so that no frame loss occurs in the WLAN communication due to the issuance of the priority signal. Further, according to the present embodiment, not only the data transmission from the wireless communication terminal 100 but also the data transmission from the wireless opposite device 10 is controlled, so that the communication quality can be kept higher. Further, since the control of data transmission from the wireless opposite device 10 is performed by using the power saving function of the wireless device 1, for example, if the WLAN communication is a wireless system of the IEEE 802.11 standard, the existing protocol can be used. It is sufficient, and it is not necessary to prepare a new protocol for transmission control of the wireless opposite device 10.

The invention made by the present inventor has been specifically described above based on the embodiments, but it goes without saying that the present invention is not limited thereto and can be variously modified without departing from the gist thereof.

For example, in the present embodiment, a wireless communication terminal that performs wireless communication of IEEE802.11 standard and wireless communication of Bluetooth standard has been described as an example, but the wireless communication terminal that performs wireless communication of other standards is not particularly limited. Is also applicable.

Further, in the time division control shown in FIG. 12, the communicable times 304 and 305 allocated to the BT communication and the WLAN communication are not fixed but can be dynamically changed. For example, when the wireless device 2 performs streaming communication such as music with a high communication frequency, it is possible to improve the communication quality by lengthening the communication available time 305 of the wireless device 2.

The wireless communication terminal 100 according to the present embodiment shows an example in which the wireless device 1 and the wireless device 2 are connected by three wires (501, 502, 503), but the present invention is not limited to this, and is shown in FIG. As described above, the communication status signals 501 and 502 may be connected by two wires. In this case, in the control shown in FIG. 15, the condition monitoring unit 12 does not determine the priority signal 503, but determines whether or not communication can be continued based on the communication status signal 502.

100 wireless communication terminal 10, 20 wireless facing device 1 or 2 wireless device 3,4,6,7 antenna 5 signal line 501 signal line (communication status signal) 502 signal line (communication status signal) 503 signal line (priority signal) 14, 16, 24 input ports 15, 25, 26 output ports 11, 21 RF section 12, 22 Condition monitoring unit 13 Communication control unit 131 Usage notification section 132 Transmission / reception control unit 133 Communication Environment Measurement Department 23 Communication control unit 231 Usage notification section 232 Transmission / reception control unit 233 Priority notification section 31A, 31B, 37A ~ 37C, 402, 406 Transmission data of wireless device 2 32A, 32B, 38A ~ 38C Transmission data of wireless opposite device 20 33A, 33B, 35A ~ 35D, 401, 405, 407 Transmission data of wireless device 1 34A, 34B, 36A, 36B, 403, 404 Transmission data of wireless opposite device 10 301, 303,305 BT communication period 302, 304 WLAN communication period