Patent Publication Number: US-2013252554-A1

Title: Wireless communication device and wireless communication system

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2012-061173, filed Mar. 16, 2012; the entire contents of which are incorporated herein by reference. 
     FIELD 
     Embodiments described herein relate to a wireless communication device. 
     BACKGROUND 
     A wireless communication standard can use an unlicensed frequency band. For example, Bluetooth® is a wireless communication standard that uses the 2.4 GHz band, which is an unlicensed frequency band. Due to this unlicensed usage, there may be interference with the communications of other wireless communication standards that use the unlicensed frequency band (e.g., 2.4 GHz band). 
     For example, there are integrated circuit devices, etc., that are implemented so as to have a Bluetooth® device and a WiFi device coexisting within the same housing, and these two devices are coupled by dedicated signal lines. In the above configuration, a communication arbitration control is carried out in time units of Bluetooth® slots (e.g., 625 μs) to ensure that Bluetooth® communication and WiFi communication do not interfere. In this method, since any one of the communications with a higher priority would be permitted, it is possible for both devices within the same housing to communicate mutually at substantially the same time and to reduce the probability of interference. Unfortunately, an entire data packet remains unprotected in this method. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a block diagram showing a wireless communication integrated circuit according to an embodiment. 
         FIG. 2  is a block diagram showing the mask setting component of  FIG. 1 . 
         FIG. 3  is a timing chart diagram showing a multi-slot packet communication of the wireless communication integrated circuit according to an embodiment. 
         FIG. 4  is a timing chart diagram showing the low energy (LE) packet burst communication of the wireless communication integrated circuit according to an embodiment. 
         FIG. 5  is a block diagram showing a wireless communication integrated circuit according to a reference example. 
         FIG. 6  is a timing chart diagram showing a multi-slot packet communication of a wireless communication integrated circuit according to a reference example. 
     
    
    
     DETAILED DESCRIPTION 
     A wireless communication device and a wireless communication system are provided to protect an entire data packet. 
     In general, communication arbitration for Bluetooth® packets that span multiple Bluetooth® slots (henceforth referred to as Bluetooth® multi-slot packet) may be disturbed. When this happens, there may be no choice but to suspend it. 
     According to embodiments of the disclosure, a first wireless communication device that conforms to the Bluetooth® standard, and carries out communication arbitration control with a second wireless communication device, that conforms to a second wireless communication standard other than the Bluetooth® standard. When Bluetooth® communication is permitted, the first wireless communication device carries out wireless communication with a third wireless communication device that conforms to the Bluetooth® standard, and controls arbitration of the wireless communication usage between the first and second wireless communication devices by creating a mask interval during which new wireless communication requests from the second wireless communication device is not accepted. 
     Therefore, in the following embodiments, a Bluetooth® device is proposed that, by providing a mask interval and not accepting communication arbitration control from other devices during the mask interval, does not allow the occurrence of suspend while a Bluetooth® packet, e.g., a Bluetooth® multi-slot packet, is being wirelessly communicated. 
     Below, various embodiments of the disclosure will be described with reference to the drawings. In this description, although a Bluetooth® device will be cited as an example of a wireless communication device, it need not be limited to this. In addition, in this description, common reference symbols will be used to refer to common parts across all the drawings. 
     First Embodiment 
     A first embodiment provides an example of Bluetooth® multi-slot packet communication. In the first embodiment, once communication has been allowed, a mask interval is generated during the communication interval of the Bluetooth® multi-slot packet, and the Bluetooth® device does not allow a suspend during this communication interval by not accepting communication arbitration control from devices of other wireless standards. 
     1. Configuration of First Embodiment 
     1-1. Overall Configuration of Wireless Communication System 
     With reference to  FIG. 1 , an example of the overall configuration of the wireless communication system according to the first embodiment is described below. As shown in  FIG. 1 , the wireless communication system according to this example is deployed such that, the Bluetooth® communication integrated circuit  21  and the integrated circuit of other wireless communication methods  31  are coupled by means of a connection line in the form of a dedicated signal line  33 , and these integrated circuits ( 21 ,  31 ) coexist on the same module. The dedicated signal line  33  is a line for the arbitration control of the communications of the two integrated circuits  21 ,  31 , due to different communication methods. The Bluetooth® communication request signal  101  in the dedicated signal line  33  is a signal that is valid when Bluetooth® communication is requested. The other wireless communications method communication request signal  102  is a signal that is valid when other wireless communication is requested. 
     In this example, the Bluetooth® communication integrated circuit  21  uses the Bluetooth® standard to carry out wireless communication with other Bluetooth® communication integrated circuit  40 , by means of the Bluetooth® communication transmit/receive signals  103 . 
     In this example, the integrated circuit of other wireless communications method  31  uses a communication standard which conforms to other arbitrary wireless communication standards using overlapping frequency bands, and is different from the Bluetooth® standard, for example, WiFi communication, etc., to carry out wireless communication with another “other wireless communications method integrated circuit”  50 , by means of the other wireless communication method transmit/receive signal  104 . 
     The Bluetooth® communication integrated circuit  21  includes a transmit processing component  4 , a receive processing component  5 , a CPU  6 , a communication control component  7 , and an “other wireless communications method coexisting operations” component  11 . 
     The Central Processing Unit (CPU)  6  controls the overall operation of this Bluetooth® communication integrated circuit  21 . 
     Under the control of the CPU  6 , the transmit processing component  4  processes the transmit signal of Bluetooth® communication to be transmitted towards the other Bluetooth® communication integrated circuit  40 , and outputs the transmit signal to the communication control component  7 . 
     For the receive processing component  5 , the receive signal of the Bluetooth® communication to be received from the other wireless communications method integrated circuit  30  is input from the communication control component  7 , and the receive processing component  5  processes the receive signal under the control of the CPU  6 . 
     Under the control of the CPU  6 , the communication control component  7 , converts the Bluetooth® communication transmit receive signal  103 , as the transmit signal from the transmit processing component  4  or the receive signal towards the receive processing component  5 . 
     The “other wireless communications method coexisting operations” component  11  includes a communication arbitration control component  1 , a status register  2 , a control register  3 , and a mask setting component  8 . 
     The communication arbitration control component  1  controls the communication arbitration with the integrated circuit of the other wireless communications method  31 . More specifically, depending on the status of the Bluetooth® communication request signal  101 , the other wireless communications method communication request signal  102 , and the effective communication request signal  805 , etc., the communication arbitration control component  1  makes Bluetooth® communication and other wireless communication methods co-exist, by controlling the transmit processing component  4  and the receive processing component  5 . 
     The status register  2  stores the status information, etc., from the communication arbitration control component  1 . The CPU  6  reads this status information and decides the status of the communication arbitration control component  1 . 
     The control register  3  stores the control mode signals, etc., from the CPU  6 . The operation of the communication arbitration control component  1  is thereby controlled. 
     The mask setting component  8  generates a mask interval depending on the control signals  801 - 803  input from the communication arbitration control component  1 . This mask interval is set to restrict the interval for accepting (e.g., acceptance window) the communication request signal of the other wireless communications method  102  from the integrated circuit of the other wireless communications method  30 . Also, using this mask interval, the other wireless communications method effective communication request signal  805  is generated. The details are described below. 
     1-2. Mask Setting Component of First Embodiment 
     With reference to  FIG. 2 , a configuration example of the mask setting component  8  according to the first embodiment is described. As shown in  FIG. 2 , the mask setting component  8  includes a mask signal generation component  81  and a mask signal application component  82 . 
     The mask signal generation component  81  is configured to use the arbitration result output timing signal  801 , the communication complete signal  802 , and the other control signals  803  input from the communication arbitration control component  1 , to generate the mask signal  811 . 
     The mask signal application component  82  is configured to use the mask signal  811  generated from the mask signal generation component  81 , mask the other wireless communications method communication request signal  102  received from the other wireless communications method integrated circuit  31 , generate the other wireless communications method effective communication request signal  805 , and output this signal  805  to the communication arbitration control component  1 . 
     2. Bluetooth® Multi-Slot Packet Communication of First Embodiment 
     Next, with reference to  FIG. 3 , the timing chart of the communication of the wireless communication device and the wireless communication system according to the first embodiment are described below. Here, communication of Bluetooth® packets spanning multiple Bluetooth® slots (“Bluetooth® multi-slot packet”) is cited as an example. 
     As shown in  FIG. 3 , in Bluetooth® multi-slot packet communication, communication arbitration control is accomplished by the communication arbitration control component  1  with multiple of the Bluetooth® slots as one unit. 
     For example, first, in slot n−1, on the basis of the communication arbitration control trigger, if the Bluetooth® communication request signal  101  changes from invalid to valid (e.g., the request signal  101  changes from “L” to “H”), an arbitration decision  1  is made at the arbitration result output timing signal  801  that occurs at a specific timing (“Tarb” or “T arbitration”) in the slot n−1. 
     In this arbitration decision  1 , since the other wireless communications method communication request signal  102  is invalid (e.g., “L” level), Bluetooth® communication has been permitted. 
     During this arbitration decision  1 , since the arbitration result output timing signal  801  (e.g., pulse signal in  FIG. 3 ) is input to the mask setting component  8 , the mask signal generation component  81  changes the mask signal  811  from level “L to “H”, and generates the mask interval (e.g., mask interval  1 ). During the period of this mask interval  1 , the mask signal  811  is valid and the other wireless communications method effective communication request signal  805  is invalid. Thus, even if the time to carry out an arbitration decision comes, and the other wireless communications method communication request signal  102  becomes valid during the period of this mask interval  1 , the communication arbitration control component  1  will not accept the request signal  102 . 
     Continuing, in slot n, if the reception of the receive signal Rx- 1  by the receive processing component  5  is complete, the communication complete signal  802  occurs (e.g., pulse signal in  FIG. 3 ) causing the mask signal generation component  81  to change the mask signal  811  to level “L”, and the mask interval  1  ends. Therefore, once the Bluetooth® communication integrated circuit  21  starts receiving Bluetooth® packet signals Rx- 1  from the other Bluetooth® communication integrated circuit  40 , such receiving is completed while the other wireless communications method effective communication request signal  805  continues in the invalid state. 
     Continuing, on the basis of the communication arbitration control trigger, if the Bluetooth® communication request signal  101  stays valid (e.g., stays “H”), an arbitration decision  2 , similar to the arbitration decision  1 , is made at the arbitration result output timing signal  801  that occurs at a specific time (Tarb) in the slot n. 
     As with the arbitration decision  1 , even in the arbitration decision  2 , because the other wireless communications method communication request signal  102  is Invalid (“L” level), Bluetooth® communication is permitted. 
     Similarly, even during the arbitration decision  2 , because the arbitration result output timing signal  801  (e.g., pulse signal in  FIG. 3 ) is input to the mask setting component  8 , the mask signal generation component  81  changes the mask signal  811  from level “L to “H”, to generate mask interval  2  (mask  2 ). During the period of mask interval  2 , mask signal  811  is valid and the other wireless communications method effective communication request signal  805  is invalid. Thus, even if the time to carry out an arbitration decision comes, and a new other wireless communications method communication request signal  102  becomes valid during the period of this mask interval  2 , the communication arbitration control component  1  will not accept the request signal  102 . 
     Continuing, in slot n+3, if the transmission of the Transmit signal Tx- 1  by the transmit processing component  4  is complete, the communication complete signal  802  occurs (e.g., pulse signal in  FIG. 3 ), the mask signal generation component  81  changes the mask signal  811  to level “L”, and the mask interval  2  ends. Therefore, once the Bluetooth® communication integrated circuit  21  starts transmitting Bluetooth® packet signals Tx- 1  towards the other Bluetooth® communication integrated circuit  40 , the transmission is completed while the other wireless communications method effective communication request signal  805  continues in the invalid state. 
     Continuing, if the communication arbitration control trigger rises and the Bluetooth® communication request signal  101  is valid, an arbitration decision  3 , similar to the arbitration decision  1  and the arbitration decision  2 , is made at the arbitration result output timing signal  801  that occurs at a specific timing (Tarb) in the slot n+ 3 . 
     In the case of this arbitration decision  3 , since the other wireless communications method communication request signal  102  is valid, the decision is made to prioritize the other wireless communications method over Bluetooth® communication such that the communication arbitration control component  1  changes the Bluetooth® communication request signal  101  from Valid (“H” level) to invalid (“L” level). In this case, reception of the Bluetooth® packet signal (Receive Rx- 2 ) from the other Bluetooth® communication integrated circuit  40  is not guaranteed, and the communication of the other wireless communication method is prioritized. In the example of  FIG. 3 , since the reception of the packet signal (receive Rx- 2 ) is not guaranteed, there is a possibility of failure of the reception of Rx- 2 . 
     In addition, in the case that the Bluetooth® communication integrated circuit  21  attempts to send a Bluetooth® packet signal, a control where the communication control arbitration component  1  can actively stop the transmission of the Bluetooth® packet, in accordance with the result of the arbitration decision  3 , may also be implemented. If the transmission is stopped in this manner, when the communication of the other wireless communications method is prioritized, as in the arbitration decision  3 , it is possible to prevent more interference. 
     However, even during this arbitration decision  3 , similarly, since the arbitration result output timing signal  801  (e.g., pulse signal in  FIG. 3 ) is input to the mask setting component  8 , the mask signal generation component  81  changes the mask signal  811  from level “L to “H”, and generates the mask interval  3  (e.g., mask  3 ). As a result of detection of the reception failure of Rx- 2 , the communication complete signal  802  is generated, and once again mask signal  811  returns to level “L”. As with mask intervals  1  and  2 ,during the period of mask interval  3 , the mask signal  811  is valid and the other wireless communications method effective communication request signal  805  is invalid. Thus, even if the time to carry out an arbitration decision comes, and a new other wireless communications method communication request signal  102  becomes valid during the period of this mask interval  3 , the communication arbitration control component  1  will not accept the request signal  102 . 
     Thereafter, substantially the same operations are repeated. 
     3. Effects of First Embodiment 
     According to the wireless communication device and wireless communication system of the first embodiment, at least the two effects can be attained. 
     In a first effect, as a result of communication arbitration, when communication is permitted with other wireless communication devices, it is possible to protect the communication of the entire packet. As described above, the first wireless communication device  21 , according to this example, conforms to the Bluetooth® standard. Furthermore, the first wireless communication device  21 , is deployed so as to co-exist on the same module with a second wireless communication device  31  conforming to another arbitrary wireless communication standard using overlapping frequency bands, and is deployed in a wireless communication system where it is possible to arbitrate and control the mutual communication by means of a dedicated signal line  33 . When Bluetooth® communication is permitted for the first wireless communication device  21 , the first wireless communication device  21  carries out wireless communication with a third wireless communication device  40  that conforms to the Bluetooth® standard. 
     Furthermore, the first wireless communication device  21  includes a mask setting component  8 , which generates a mask interval not allowing the acceptance of communication requests from the second wireless communication device  31  that conforms to an arbitrary wireless standard. 
     Hence, for example, as explained above with reference to  FIG. 3 , if the control trigger rises and the Bluetooth® communication request signal  101  is valid, an arbitration decision is made at the arbitration result output timing signal  801  that occurs at a specific timing (Tarb). For example, during the arbitration decision  2 , since the arbitration result output timing signal  801  (e.g., pulse signal in  FIG. 3 ) is input to the mask setting component  8 , the mask signal generation component  81  changes the mask signal  811  from level “L to “H”, and generates the mask interval  2  (e.g., mask  2 ). During the period of this mask interval  2 , the mask signal  811  is valid and the other wireless communications method effective communication request signal  805  is invalid. Thus, even if the time to carry out an arbitration decision comes, and the other wireless communications method communication request signal  102  becomes valid during the period of this mask interval  2 , the communication arbitration control component  1  will not accept the request signal  102 . Therefore, once the Bluetooth® communication integrated circuit  21  starts transmitting Bluetooth® packet signals Tx- 1  towards the other Bluetooth® communication integrated circuit  40 , the transmission is completed while the other wireless communications method effective communication request signal  805  continues in the invalid state. 
     In this manner, in this example, as a result of communication arbitration by the communication arbitration control component  1 , when communication with the other Bluetooth® communication device  40  is permitted, by generating a mask interval and using the other wireless communications method effective communication request signal  805  that reflects the effects of that mask, it is possible to process the transmit receive signals. Therefore, as an advantage, the communication of the entire packet can be protected. 
     On the other hand, for example, as in the comparison example described below in  FIG. 6 , multi-slot packet has the disadvantage of, for the slots n+2 and n+3 of the transmission packets of the portions indicated by the dashed line, obstructed communication there between. 
     In a second effect, communication arbitration is advantageous for implementation. Here, in Bluetooth® communication, it is necessary to manage communication in a fixed length of time, and depending on the application, transmit and receive the packets at certain specific intervals. For example, voice and audio apply to such an example. In this example, when multiple wireless communication methods coexist, in order to maintain the quality of applications such as voice and audio, control is often implemented to conform with fixed-length time management such as Bluetooth®. 
     In this example, for such circumstances, there is an advantage in terms of implementation that it is possible to protect the communication of the entire packet pertaining to transmission and reception as well as maintain the quality of the application. 
     Furthermore, as in this first embodiment, when communication of Bluetooth® packets spanning multiple Bluetooth® slots (Bluetooth® multi-slot packet) is to be carried out, the wireless communication device and system are even more efficient. 
     Second Embodiment 
     Next, the wireless communication device and wireless communication system, according to a second embodiment, are described below. The second embodiment is related to an example of the Bluetooth® low energy standard. Bluetooth® low energy standard (“LE standard”) is a new standard of the Bluetooth® standard wherein communication is done in Bluetooth® packet bursts such that Bluetooth® packets are bunched together at fixed time intervals. In this description, detailed description of portions that duplicate the above-described first embodiment is omitted. 
     4. Configuration of Second Embodiment 
     Because a configuration example of the second embodiment is substantially similar to those shown in  FIG. 1  and  FIG. 2  of the first embodiment, a brief description of the configuration example is provided below, but a detailed description of the configuration example is omitted. 
     Even in the case of the LE standard of this example, when communication arbitration control is carried out for each Bluetooth® slot, it is possible that the Bluetooth® packet burst for which communication start is allowed at first, can be obstructed in between. In keeping with the aim of the LE standard to accomplish low power consumption by minimizing the active time window by completing transmission of the Bluetooth® packet burst in that time window and causing a sleep state at other times, obstruction necessitates a resend of the Bluetooth® packet burst, which is an inconsistent operation. 
     Therefore, even in the second embodiment, a mask interval is generated by the mask setting component  8 . Hence, during the communication interval of the Bluetooth® packet burst of LE standard, once communication has been allowed, the suspend as mentioned above does not occur in the Bluetooth® device  21  because communication arbitration control from the device  31  of another arbitrary wireless standard is not accepted. 
     Next, the timing chart of the communication of the wireless communication device and the wireless communication system, according to the second embodiment, is described in accordance with  FIG. 4 . Here, the communication of a group of consecutive Bluetooth® packets conforming with the LE standard (“Bluetooth® LE packet burst”) is cited as an example. 
     As shown in the figure, first, during slot n−1, on the basis of the communication arbitration control trigger, if the Bluetooth® communication request signal  101  changes from invalid to valid (e.g., changes from “L” to “H”), an arbitration decision  1  is made at the arbitration result output timing signal  801  that occurs at a specific timing (Tarb) in the slot n−1. 
     In this arbitration decision  1 , since the other wireless communications method communication request signal  102  is invalid (“L” level), the decision is made to permit Bluetooth® communication. 
     During this arbitration decision  1 , since the arbitration result output timing signal  801  (e.g., pulse signal in  FIG. 3 ) is input to the mask setting component  8 , the mask signal generation component  81  changes the mask signal  811  from level “L to “H” and generates the mask interval  1  (e.g., mask  1 ). During the period of this mask interval  1 , the mask signal  811  is valid and the other wireless communications method effective communication request signal  805  is invalid. Thus, even if the time to carry out an arbitration decision comes, and the other wireless communications method communication request signal  102  becomes valid during the period of this mask interval  1 , the communication arbitration control component  1  will not accept the request signal  102 . 
     Hence, with the other wireless communications method effective communication request signal  805  set in the invalid state due to this mask interval  1 , the LE packet signal Rx- 1  is received from the other Bluetooth® communication integrated circuit  40 . 
     Continuing, with the other wireless communications method effective communication request signal  805  set in the invalid state due to mask interval  1 , LE packet signals Tx- 1  continue to be sent from Rx- 1 . 
     Continuing, during slot n+1, even if the other wireless communications method communication request signal  102  changes from Level “L” to Level “H”, because the other wireless communications method effective communication request signal  805  is set as invalid by mask interval  1 , LE packet signals Rx- 2  are received following Tx- 1 . 
     Continuing, similarly, with the other wireless communications method effective communication request signal  805  set in the invalid state due to mask interval  1 , LE packet signals Tx- 2  are sent following Rx- 2 . 
     Continuing, during slot n+5, if the transmission of the transmit signal Tx- 2  by the transmit processing component  4  is complete, the communication complete signal  802  occurs (e.g., pulse signal in  FIG. 3 ), the mask signal generation component  81  changes the mask signal  811  to level “L”, and the mask interval  1  ends. 
     Thereafter, substantially the same operations are repeated. Other configurations, operations, etc., of the second embodiment are substantially similar to those of the first embodiment described above. 
     5. Effects of Second Embodiment 
     As described above, with the wireless communication device and wireless communication system according to the second embodiment, effects similar to the two effects described above in the first embodiment can be achieved. Furthermore, at least the effects shown below can be achieved. 
     As described above, even with use of Bluetooth® LE packet burst communication as in the second embodiment, it is possible to protect the communication of the entire Bluetooth® LE packet burst. Depending on the need, it is possible to adopt this example. 
     Furthermore, in Bluetooth® LE packet burst communication, as shown in  FIG. 4 , when the result of the arbitration decision  1  permits Bluetooth® communication, with the other wireless communications method effective communication request signal  805  set in the invalid state due to mask interval  1 , it is possible to communicate LE packet signals (Rx- 1 , Tx- 1 , Rx- 2 , Tx- 2 ) continuously. 
     In this manner, since it is possible to carry out communication continuously without being forced to re-transmit Bluetooth® packet bursts, it becomes possible to minimize the Active time window, and complete the communication of the Bluetooth® LE packet bursts in the time window of mask interval  1  while otherwise causing a sleep state. 
     Consequently, it is highly advantageous from the perspective that, by adopting this second embodiment in an environment where the second embodiment co-exists with other wireless communication methods, it is possible to maximize the characteristics of Bluetooth® LE packet burst communication and reduce power consumption. 
     6. Comparison Example of First and Second Embodiments 
     Next, a comparison example is described in order to compare the wireless communication device and wireless communication systems according to the above-described first and second embodiments. 
       FIG. 5  shows a wireless communication system according to the comparison example, which deploys a Bluetooth® device  20  having a connection line  33  of a dedicated signal line required for the arbitration control of communication with the wireless communication device  30  of another wireless communications method. 
     As shown in the  FIG. 5 , in order to implement communication arbitration control with the other wireless communications method integrated circuit  30 , the Bluetooth® communication integrated circuit  20  has an “other wireless communications method coexisting operations” component  10  built-in. The Bluetooth® communications request signal  101  is a signal that is valid when Bluetooth® communication is requested, and the other wireless communications method communication request signal  102  is also a similar signal. The communication arbitration control component  1  allows Bluetooth® communication and other wireless communication methods to co-exist by controlling the transmit processing component  4  and the receive processing component  5 , depending on the state of these signals. 
     Nevertheless, the Bluetooth® communication integrated circuit  20 , according to the comparison example, differs from the first and second embodiments in that the Bluetooth® communication integrated circuit  20  does not possess the mask setting component  8 . 
     7. Bluetooth® Multi-Slot Packet Communication 
       FIG. 6  is a timing chart diagram showing a multi-slot packet communication of a wireless communication integrated circuit according to a reference example. Here, similarly, Bluetooth® multi-slot packet communication is cited as an example. 
     For example, in Slot n, at the time of the communication arbitration control trigger, if the Bluetooth® communication request signal  101  is valid, at a specific timing (Tarb) from Slot n, arbitration decision  2  is made. As a result of this arbitration decision  2 , if Bluetooth® communication is permitted, the LE packet signal Tx is transmitted. 
     Continuing, although at a specific timing (Tarb) from slot n+1, arbitration decision  3  is made, at this time, since the other wireless communications method communication request signal  102  is valid, the result of this arbitration decision  3  is a decision in which the other wireless communications method is permitted. Due to this result, the Bluetooth® communication request signal  101  changes from level “H” to the level “L” indicating invalid, and as shown in the figure by the dotted line, the transmission of the incomplete LE packet signal Tx gets suspended in between. 
     In this manner, since the mask setting component  8  according to the first and second embodiments is not provided in the reference example, it is not possible to set the mask interval. Consequently, the reference example has the disadvantage that, during the communication interval of the Bluetooth® multi-slot packet, once communication has been allowed, if the Bluetooth® device  20  receives a new communication arbitration control from the device  30  of another arbitrary wireless standard, communication interruption occurs. 
     As described above, in Bluetooth®, it is necessary to manage communication in time units of fixed length and, depending on the application, transmit and receive the packets at certain specific intervals. For example, voice and audio apply to such an example. When multiple wireless communication methods coexist, in order to prioritize and maintain the quality of applications such as voice and audio over other applications, although control is often done so as to conform to fixed length time management such as Bluetooth®, in the comparison example such as one which carries out simple arbitration control in fixed length time units, there may be cases where it is difficult to maintain quality. 
     While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel embodiments described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the embodiments described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions.