Communication apparatus and communication method

Abstract

To provide a communication device capable of suppressing reception of erroneous data.SOLUTION: A communication device includes a control unit that interprets a CyclicRedundancyCheck (CRC) field and an acknowledgement (ACK) field in information data of a DigitalEnhancedCordlessTelecommunications (DECT) system as an information data CRC field in the information data, and a radio unit that transmits and receives a radio signal including the information data and information data CRC in the information data CRC field.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present disclosure relates to a communication device and a communication method. [Background technology]

[0002] One wireless communication system is the Digital Enhanced Cordless Telecommunications (DECT) system, which uses a Cyclic Redundancy Check (CRC) to detect data errors. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-55399 Summary of the Invention [Problem to be solved by the invention]

[0004] In the DECT system, the CRC has only four bits, which is a small number, and data may slip through (incorrect data may be received without being discarded).

[0005] Non-limiting embodiments of the present disclosure contribute to providing a communication device that can suppress reception of erroneous data. [Means for solving the problem]

[0006] A communication device according to one embodiment of the present disclosure includes a control unit that interprets a CRC (Cyclic Redundancy Check) field and an ACK (Acknowledgement) field in information data of a DECT (Digital Enhanced Cordless Telecommunications) system as an information data CRC field in the information data, and a radio unit that transmits and receives radio signals including the information data and the information data CRC in the information data CRC field.

[0007] A communication method according to one embodiment of the present disclosure interprets a CRC (Cyclic Redundancy Check) field and an ACK (Acknowledgement) field in information data of a DECT (Digital Enhanced Cordless Telecommunications) system as an information data CRC field in the information data, and receives a wireless signal including the information data and the information data CRC in the information data CRC field.

[0008] These comprehensive or specific aspects may be realized as a system, an apparatus, a method, an integrated circuit, a computer program, or a recording medium, or may be realized as any combination of a system, an apparatus, a method, an integrated circuit, a computer program, and a recording medium. [Effects of the Invention]

[0009] According to an embodiment of the present disclosure, reception of erroneous data can be suppressed.

[0010] Further advantages and benefits of an embodiment of the present disclosure will become apparent from the specification and drawings. Such advantages and / or benefits may be provided by some of the embodiments and features described in the specification and drawings, respectively, but not necessarily all of them may be provided to obtain one or more identical features. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 illustrates a communication system to which a communication device according to the present disclosure is applied. [Figure 2] Door-to-door machine block diagram [Figure 3] Repeater block diagram [Figure 4] Indoor unit block diagram [Figure 5] Lobby machine block diagram [Figure 6] A diagram explaining the frame and slot structure of the DECT system [Figure 7] Diagram explaining two-way communication using the DECT method [Figure 8] A diagram showing the field configuration of a radio signal in one slot of the DECT system [Figure 9] FIG. 1 is a diagram showing a field configuration of a radio signal in one slot according to the present disclosure. [Figure 10] Diagram explaining multiple communication channels [Figure 11] Flowchart showing the response operation of the front door unit [Figure 12] Flowchart showing the operation in S8 of FIG. 11 DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanation of already well-known matters or redundant explanation of substantially identical configurations may be omitted. This is to avoid unnecessary redundancy in the following explanation and to facilitate understanding by those skilled in the art.

[0013] The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0014] <System configuration> Fig. 1 is a diagram showing a communication system to which a communication device according to the present disclosure is applied. As shown in Fig. 1, the communication system includes front-of-house units 1a and 1b, repeaters 2a and 2b, indoor units 3a and 3b, and a lobby unit 4. Fig. 1 shows an apartment building A1 in which the communication system is installed.

[0015] The door units 1a and 1b are, for example, intercom slave units. The door units 1a and 1b are installed near the entrances of the respective units in the apartment building A1. The door units 1a and 1b communicate with the repeaters 2a and 2b via wireless communication. The door units 1a and 1b communicate with the indoor units 3a and 3b via wired communication. The door units 1a and 1b may also communicate with the indoor units 3a and 3b wirelessly.

[0016] Repeaters 2a and 2b are installed, for example, on the exterior walls of the corridors on each floor of apartment building A1, and communicate via wireless communication with door-front units 1a and 1b installed near the entrances of each unit in apartment building A1. Repeaters 2a and 2b may communicate with multiple door-front units.

[0017] The repeaters 2a and 2b communicate with the lobby unit 4 by wire. The repeaters 2a and 2b may also communicate with the lobby unit 4 by wireless.

[0018] The indoor units 3a and 3b are, for example, master units of an intercom. The indoor units 3a and 3b are installed in each unit of the apartment building A1. The indoor units 3a and 3b communicate with front-of-house units 1a and 1b installed near the entrances of the respective units.

[0019] The lobby unit 4 is installed, for example, in the lobby of an apartment building A1. The lobby unit 4 communicates with the indoor units 3a and 3b via repeaters 2a and 2b and door units 1a and 1b. For example, when a room number is pressed, the lobby unit 4 calls the indoor unit of the pressed room number and communicates with the indoor unit.

[0020] The communication system according to the present disclosure is not limited to application to an intercom system in the apartment building A1, but may also be applied to, for example, a telephone system.

[0021] The numbers of the door units 1a and 1b, the repeaters 2a and 2b, the indoor units 3a and 3b, and the lobby unit 4 are not limited to the example shown in FIG.

[0022] The front-of-household units 1a and 1b may be referred to as child units or slaves. The repeaters 2a and 2b may be referred to as parent units or masters. The front-of-household units 1a and 1b, the repeaters 2a and 2b, and the indoor unit 3 may be referred to as communication devices.

[0023] In the following description, when there is no need to distinguish between the front door units 1a and 1b, they may be referred to as a front door unit 1. When there is no need to distinguish between the repeaters 2a and 2b, they may be referred to as a repeater 2.

[0024] <Block configuration> 1. Block configuration of door unit 1 Fig. 2 is a block diagram of the door unit 1. As shown in Fig. 2, the door unit 1 has a control unit 11, a wireless unit 12, a wired communication unit 13, an operation unit 14, an audio processing unit 15, a microphone 16, and a speaker 17.

[0025] The control unit 11 controls the entire door front unit 1. The control unit 11 executes programs stored in a storage unit (not shown), for example, to realize the functions of the door front unit 1. The control unit 11 may be configured by a processor such as a CPU (Central Processing Unit), for example.

[0026] The wireless unit 12 communicates wirelessly with the repeater 2. The wired communication unit 13 communicates with the indoor unit 3 via a wired connection.

[0027] The operation unit 14 has a button (for example, a call button) that accepts an operation by a person such as a visitor. The operation unit 14 outputs to the control unit 11 a signal corresponding to the accepted operation.

[0028] The audio processing unit 15 converts the digital audio signal output from the control unit 11 into an analog audio signal and outputs it to the speaker 17. The audio processing unit 15 converts the analog audio signal output from the microphone 16 into a digital audio signal and outputs it to the control unit 11. The microphone 16 and the speaker 17 enable audio communication with the indoor unit 3.

[0029] 2. Block diagram of repeater 2 3 is a block diagram of the repeater 2. As shown in FIG. 3, the repeater 2 has a control unit 21, a wireless unit 22, a wired communication unit 23, an operation unit 24, and a display unit 25.

[0030] The control unit 21 controls the entire repeater 2. The control unit 21 executes, for example, a program stored in a storage unit (not shown) to realize the functions of the repeater 2. The control unit 21 may be configured by, for example, a processor such as a CPU.

[0031] The wireless unit 22 communicates wirelessly with the door unit 1. The wired communication unit 23 communicates with the lobby unit 4 via a wired connection.

[0032] The operation unit 24 has buttons that accept operations by a person such as a maintenance person, and outputs a signal to the control unit 21 according to the accepted operation.

[0033] The display unit 25 displays the state of the repeater 2. The display unit 25 includes, for example, an LED (Light Emitting Diode), and displays the state of the repeater 2, such as whether it is operating normally, by emitting light from the LED.

[0034] 3. Block configuration of indoor unit 3 Fig. 4 is a block diagram of the indoor unit 3. As shown in Fig. 4, the indoor unit 3 has a control unit 31, a wired communication unit 32, an operation unit 33, an audio processing unit 34, a microphone 35, a speaker 36, and an image processing unit 37.

[0035] The control unit 31 controls the entire indoor unit 3. The control unit 31 executes, for example, a program stored in a storage unit (not shown) to realize the functions of the indoor unit 3. The control unit 31 may be configured by a processor such as a CPU, for example.

[0036] The wired communication unit 32 communicates with the front-of-door unit 1 via a wire. The operation unit 33 has, for example, buttons that accept operations by the resident of the household. The operation unit 33 outputs a signal to the control unit 31 in accordance with the accepted operation.

[0037] The audio processing unit 34 converts the digital audio signal output from the control unit 31 into an analog audio signal and outputs it to the speaker 36. The audio processing unit 34 converts the analog audio signal output from the microphone 35 into a digital audio signal and outputs it to the control unit 31. The microphone 35 and speaker 36 enable audio communication with the door unit 1. The microphone 35 and speaker 36 enable audio communication with the lobby unit 4.

[0038] Image processing unit 37 generates image data to be output to video display unit 38 under the control of control unit 31. Video display unit 38 includes, for example, an LCD (Liquid Crystal Display) and displays an image based on the image data. Video display unit 38 displays, for example, an image captured by a camera of lobby machine 4.

[0039] 4. Lobby machine 4 block configuration Fig. 5 is a block diagram of the lobby device 4. As shown in Fig. 5, the lobby device 4 has a control unit 41, a wired communication unit 42, an operation unit 43, an audio processing unit 44, a microphone 45, a speaker 46, an image processing unit 47, a camera unit 48, and a detection unit 49.

[0040] The control unit 41 controls the entire lobby unit 4. The control unit 41 executes, for example, a program stored in a storage unit (not shown) to realize the functions of the lobby unit 4. The control unit 41 may be configured by, for example, a processor such as a CPU.

[0041] The wired communication unit 42 communicates with the repeater 2 via a wire. The operation unit 43 has buttons (for example, call buttons) that receive operations from people such as visitors. The operation unit 43 outputs a signal corresponding to the received operation to the control unit 41.

[0042] The voice processing unit 44 converts the digital voice signal output from the control unit 41 into an analog voice signal and outputs it to the speaker 46. The voice processing unit 44 converts the analog voice signal output from the microphone 45 into a digital voice signal and outputs it to the control unit 41. The microphone 45 and the speaker 46 enable voice calls with the indoor unit 3.

[0043] The image processing unit 47 outputs the image data output from the camera unit 48 to the control unit 41. The camera unit 48 has a camera and shoots inside the lobby. The image data of the image shot by the camera unit 48 is transmitted to the indoor unit 3.

[0044] The detection unit 49 detects people inside the lobby. When the detection unit 49 detects a person, the control unit 41, for example, turns on the lighting installed in the lobby.

[0045] <DECT System Frame and Slot Configuration> FIG. 6 is a diagram for explaining the frame and slot configuration of the DECT system. As shown in FIG. 6, in the DECT system, for example, one frame is composed of 24 slots. The first half of the slots (SL) 1 to slot 12 in one frame are used for downlink communication (for example, communication from the repeater 2 to the outdoor unit 1), and the second half of the slots 13 to slot 24 are used for uplink communication (for example, communication from the outdoor unit 1 to the repeater 2).

[0046] For communication in the DECT system, two slots separated by 12 slots are used as a pair. For example, as shown by the arrow A6a in FIG. 6, for communication between the master unit and the slave unit, the pair of slot 2 and slot 14 is used.

[0047] FIG. 7 is a diagram for explaining two-way communication of the DECT system. As described above, in the communication of the DECT system, two slots separated by 12 slots are used as a pair. For example, as shown in FIG. 7, slot (SL) 2 is used for communication from the master unit to the slave unit (downlink), and slot 14 separated by 12 slots is used for communication from the slave unit to the master unit (uplink). Thereby, two-way communication between the master unit and the slave unit becomes possible.

[0048] <Field Configuration of Radio Signal in DECT System> FIG. 8 is a diagram showing the field configuration of a radio signal in one slot of the DECT system.

[0049] In the CRC1 field shown in FIG. 8, an error detection signal (data or information) of the control data stored in the control data field is stored. The CRC1 field is 16 bits.

[0050] In the CRC2 field shown in FIG. 8, an error detection signal of the information data stored in the information data field is stored. The CRC2 field is 4 bits.

[0051] In the ACK field shown in FIG. 8, an interference detection signal is stored. The ACK field is 4 bits.

[0052] The guard interval field shown in FIG. 8 is an additional interval for preventing inter-symbol interference. The guard interval field is 56 bits.

[0053] <Field Configuration of Radio Signal in the Present Disclosure> FIG. 9 is a diagram showing the field configuration of a radio signal in one slot of the present disclosure.

[0054] In the CRC1 field shown in FIG. 9, an error detection signal of the control data stored in the control data field is stored. The CRC1 field is 16 bits.

[0055] The CRC3 field shown in FIG. 9 stores an error detection signal for the information data stored in the information data field. The CRC2 field is 8 bits.

[0056] The guard interval field shown in FIG. 9 is an additional interval for preventing inter-symbol interference. The guard interval field is 56 bits.

[0057] The wireless signal of the present disclosure is different from the DECT-based wireless signal shown in FIG. 8 in terms of the CRC2 field and the ACK field. In the present disclosure, the CRC2 field and the ACK field of the wireless signal in the DECT system are used as one CRC3 field.

[0058] That is, in the DECT system, a 4-bit CRC is used for error detection of the information data stored in the information data field, but in the present disclosure, an 8-bit CRC is used for error detection of the information data stored in the information data field. That is, in the present disclosure, the CRC field of the information data is extended from 4 bits to 8 bits.

[0059] Thereby, in the present disclosure, in the wireless communication between the outdoor unit 1 and the repeater 2, the leakage of incorrect information data is suppressed. And by suppressing the leakage of incorrect information data, voice reproduction and image reproduction due to incorrect information data between the outdoor unit 1 and the repeater 2 are suppressed, and a decrease in the quality of voice reproduction and image reproduction is suppressed.

[0060] Note that the outdoor unit 1 and the repeater 2 perform wireless communication based on the DECT system except for the CRC3 field of the wireless signal. That is, the outdoor unit 1 and the repeater 2 comply with the DECT system except for the interpretation (processing) of the CRC3 field. For example, the outdoor unit 1 and the repeater 2 may apply the <DECT system frame and slot configuration> described above except for the <multi-communication channel> described below.

[0061] <Multi-communication channel> If the door unit 1 detects erroneous information data based on the CRC3, it performs muting processing. For example, if the door unit 1 receives erroneous audio data, it sets the volume of the audio data (audio signal) to 0. This prevents the playback of noise caused by the erroneous audio data.

[0062] Here, for example, if the quality of wireless communication between the door unit 1 and the repeater 2 deteriorates due to interference radio waves, the number of times erroneous information data is detected increases based on CRC3. As the number of times erroneous information data is detected increases, the number of muting processes increases, and the number of silences in the voice call between the door unit 1 and the repeater 2 increases. Therefore, in the present disclosure, the door unit 1 and the repeater 2 communicate wirelessly using two communication channels.

[0063] 10 is a diagram illustrating a multi-communication channel. The front door unit 1 and the repeater 2 communicate wirelessly using two communication channels (slots). The front door unit 1 and the repeater 2 send and receive the same information data over the two communication channels.

[0064] 10, the repeater 2 performs downstream communication using two communication channels, slot (SL) 2 and slot 3. The repeater 2 transmits the same information data to the door unit 1 through the two channels, slot 2 and slot 3.

[0065] For example, as shown in Fig. 10, the front-of-door unit 1 performs upstream communication using two communication channels: slot 14, which is a pair slot of slot 2, and slot 15, which is a pair slot of slot 3. The front-of-door unit 1 transmits the same information data to the repeater 2 through the two channels, slot 14 and slot 15.

[0066] In this way, the door unit 1 and the repeater 2 transmit the same information data using two communication channels, which allows the door unit 1 and the repeater 2 to receive error-free information data even if one of the two communication channels contains erroneous information data due to, for example, jamming radio waves.

[0067] For example, in Figure 10, slots 2 and 3 contain the same information data, but jamming radio waves cause an error in the information data in slot 2. In this case, the door unit 1 detects the error in the information data in slot 2 based on CRC3 and discards the information data in slot 2. The door unit 1 then receives error-free information data in slot 3, the other of slots 2 and 3.

[0068] 10, for example, of slots 14 and 15 containing the same information data, an error is included in the information data of slot 14 due to jamming radio waves. In this case, repeater 2 detects the error in the information data in slot 14 based on CRC3 and discards the information data of slot 14. Repeater 2 receives error-free information data in slot 15, the other of slots 14 and 15.

[0069] 10, the two communication channels (slots) are adjacent to each other, but this is not limiting. The two communication channels may be spaced apart. When the two communication channels are spaced apart, it is possible to reduce the possibility of errors being included in the information data of both of the two communication channels compared to when the two communication channels are adjacent to each other.

[0070] The door front unit 1 and the repeater 2 may also establish three or more communication channels. The door front unit 1 and the repeater 2 may also transmit the same information data through three or more communication channels.

[0071] <Operation flow> 1. Response operation of door unit 1 11 is a flowchart showing the response operation of the door front unit 1. The door front unit 1 repeatedly executes the processing of the flowchart shown in FIG.

[0072] The door unit 1 executes a process of waiting for a control signal regarding a call from the lobby unit 4 (S1).

[0073] The door unit 1 determines whether or not a control signal has been received (S2).

[0074] If the door unit 1 has not received the control signal (NO in S2), the process of this flowchart ends.

[0075] When the door unit 1 receives the control signal (YES in S2), it activates the communication channel 1 for the information data (S3).

[0076] The door unit 1 determines whether or not the connection with the lobby unit 4 has been successful (S4).

[0077] If the door unit 1 is not successful in connecting with the lobby unit 4 (NO in S4), it transmits an error message to the lobby unit 4 (S5). Then, the door unit 1 ends the processing of this flowchart.

[0078] If the door unit 1 is successful in connecting with the lobby unit 4 (YES in S4), it starts voice communication (starts relaying voice communication between the indoor unit 3 and the lobby unit 4) (S6).

[0079] The door unit 1 activates a communication channel 2 for the information data (S7). That is, the door unit 1 initiates connection (communication) with the lobby unit 4 using one communication channel 1, and if the connection with the lobby unit 4 is successful, activates a second communication channel 2.

[0080] The front door unit 1 communicates with the repeater 2 (S8). In other words, the front door unit 1, together with the repeater 2, relays communication between the indoor unit 3 and the lobby unit 4. The communication in S8 may include voice communication between the indoor unit 3 and the lobby unit 4 and communication of image data of images captured by the lobby unit 4.

[0081] The repeater 2 includes the same downstream information data in the two communication channels 1 and 2 activated in S3 and S7 and transmits them to the front-of-door unit 1. In the processing of S8, the front-of-door unit 1 transmits the downstream information data of one of the two communication channels 1 and 2 containing the same downstream information data to the indoor unit 3 (see the flowchart in Figure 12).

[0082] In addition, in the process of S8, the front door unit 1 includes the same uplink information data in the two activated communication channels 1 and 2 and transmits them to the repeater 2. The repeater 2 transmits the uplink information data of one of the two communication channels 1 and 2 containing the same uplink information data to the lobby unit 4.

[0083] The door unit 1 determines whether or not a communication end operation (for example, a call end operation) has been performed in the indoor unit 3 (S9).

[0084] If the indoor unit 3 has not performed an operation to end the call (NO in S9), the door unit 1 proceeds to S8 and continues communication with the repeater 2.

[0085] If an operation to end the call is performed in the indoor unit 3 (YES in S9), the door unit 1 disconnects the communication channel 1 (S10).

[0086] After disconnecting communication channel 1, the door front unit 1 disconnects communication channel 2 (S11). Then, the door front unit 1 ends the processing of this flowchart.

[0087] In addition, if the front door unit 1 fails to start communication channel 2 of S7 (if it fails to connect to the lobby unit 4 on communication channel 2), it may communicate with the lobby unit 4 (repeater 2) using only communication channel 1.

[0088] Alternatively, the door unit 1 may disconnect communication channel 2 in S10 and communication channel 1 in S11.

[0089] 2. Communication channel selection operation of front door unit 1 FIG. 12 is a flowchart showing the operation in S8 of FIG.

[0090] The door unit 1 determines whether or not there is an error in the downstream information data of the communication channel 1 based on the CRC3 of the communication channel 1 (S21).

[0091] If the front door unit 1 determines that there is no error in the downstream information data of communication channel 1 (NO in S21), it transmits the downstream information data of communication channel 1 to the indoor unit 3 (S22). Then, the front door unit 1 ends the processing of this flowchart and proceeds to processing of S9 in Fig. 11. Note that if the front door unit 1 determines that there is no error in the downstream information data of communication channel 1, it may discard the downstream information data of communication channel 2.

[0092] If the door unit 1 determines that there is an error in the downstream information data of communication channel 1 (YES in S21), it determines whether there is an error in the downstream information data of communication channel 2 based on the CRC3 of communication channel 2 (S23).

[0093] If the front door unit 1 determines that there is no error in the downstream information data of communication channel 2 (NO in S23), it transmits the downstream information data of communication channel 2 to the indoor unit 3 (S24). In other words, if there is an error in the downstream information data of communication channel 1 and no error in the downstream information data of communication channel 2, the front door unit 1 transmits the downstream information data of communication channel 2 to the indoor unit 3. Then, the front door unit 1 ends the processing of this flowchart and proceeds to processing of S9 in FIG. 11.

[0094] If the front-of-door unit 1 determines that there is an error in the downstream information data of the communication channel 2 (YES in S23), it transmits the downstream information data that has been subjected to audio muting processing to the indoor unit 3 (S25).The front-of-door unit 1 then ends the processing of this flowchart and proceeds to processing of S9 in FIG.

[0095] Summary of this disclosure The control unit 11 of the door unit 1 interprets the CRC field and ACK field in the DECT information data as one CRC field in the information data (information data CRC field). The wireless unit 12 of the door unit 1 transmits and receives wireless signals including the information data and the CRC in the information data CRC field.

[0096] Therefore, the front door unit 1 receives a wireless signal in which the DECT CRC field and ACK field are expanded into a single CRC field, and interprets the expanded CRC field as the CRC field of information data, thereby preventing the reception of erroneous information data.

[0097] In addition, the front door unit 1 interprets the DECT CRC field and ACK field as a single CRC field and transmits a wireless signal including the CRC of the information data, so the repeater 2 receiving the information data from the front door unit 1 can prevent receiving erroneous information data.

[0098] <Modification> Variation 1 The processing of the flowchart in Fig. 11 may be executed by the indoor unit 3. For example, when the indoor unit 3 receives a control signal related to a call from the lobby unit 4, it may activate communication channel 1. When the indoor unit 3 has successfully connected to the lobby unit 4, it may activate communication channel 2. When an operation to end the call is performed, the indoor unit 3 may disconnect communication channels 1 and 2.

[0099] The processing of the flowchart in Fig. 12 may be executed by the indoor unit 3. For example, the indoor unit 3 may execute the same processing as that of the flowchart in Fig. 12 for the downstream communication channels 1 and 2.

[0100] Variation 2 The process of the flowchart in Fig. 11 may be executed by the repeater 2. For example, the repeater 2 may activate communication channel 1 when it receives a control signal related to a call from the lobby unit 4. The repeater 2 may activate communication channel 2 when it successfully connects to the indoor unit 3. The repeater 2 may disconnect communication channels 1 and 2 when an operation to end a call is performed on the indoor unit 3.

[0101] The process of the flowchart in Fig. 12 may be executed by the repeater 2. For example, the repeater 2 may execute the same process as the flowchart in Fig. 12 for the upstream communication channels 1 and 2. The front-of-door unit 1 or the indoor unit 3 may transmit the same upstream information data on the upstream communication channels 1 and 2.

[0102] Although the embodiments have been described above with reference to the drawings, the present disclosure is not limited to such examples. It is clear that a person skilled in the art can conceive of various modifications or alterations within the scope of the claims. It is understood that such modifications or alterations also fall within the technical scope of the present disclosure. Furthermore, the components in the embodiments may be combined in any manner without departing from the spirit of the present disclosure.

[0103] In the above-described embodiments, the notation "... part" used for each component may be replaced with other notations such as "... circuitry," "... assembly," "... device," "... unit," or "... module."

[0104] The present disclosure can be realized by software, hardware, or software linked to hardware. Each functional block used in the description of the above embodiments may be partially or entirely realized as an LSI, which is an integrated circuit, and each process described in the above embodiments may be partially or entirely controlled by a single LSI or a combination of LSIs. The LSI may be composed of individual chips, or may be composed of a single chip that includes some or all of the functional blocks. The LSI may have data input and output. Depending on the degree of integration, the LSI may be called an IC, system LSI, super LSI, or ultra LSI.

[0105] The integrated circuit method is not limited to LSI, but may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. Also, a field programmable gate array (FPGA) that can be programmed after LSI manufacturing, or a reconfigurable processor that can reconfigure the connections and settings of circuit cells within the LSI, may be used. The present disclosure may be realized as digital processing or analog processing.

[0106] Furthermore, if an integrated circuit technology that can replace LSI emerges due to advances in semiconductor technology or other derivative technologies, it is natural that such technology may be used to integrate functional blocks. The application of biotechnology, etc. is also a possibility.

[0107] The present disclosure may be implemented in any type of apparatus, device, or system (collectively referred to as a communications apparatus) that has a communications function. The communications apparatus may include a wireless transceiver and processing / control circuitry. The wireless transceiver may include a receiver and a transmitter, or both functions. The wireless transceiver (transmitter and receiver) may include a radio frequency (RF) module and one or more antennas. The RF module may include an amplifier, an RF modulator / demodulator, or the like. Non-limiting examples of communication devices include telephones (e.g., cell phones, smartphones), tablets, personal computers (PCs) (e.g., laptops, desktops, notebooks), cameras (e.g., digital still / video cameras), digital players (e.g., digital audio / video players), wearable devices (e.g., wearable cameras, smartwatches, tracking devices), game consoles, digital book readers, telehealth / telemedicine devices, communication-enabled vehicles or mobile transportation (e.g., cars, airplanes, ships), and combinations of the above devices.

[0108] Communications equipment is not limited to portable or mobile equipment, but also includes non-portable or fixed equipment, devices, and systems of any kind, such as smart home devices (such as appliances, lighting equipment, smart meters or metering devices, control panels, etc.), vending machines, and any other "things" that may exist on an IoT (Internet of Things) network.

[0109] A communications apparatus also includes devices such as controllers and sensors connected or coupled to a communications device that performs the communications functions described in this disclosure, such as controllers and sensors that generate control and data signals used by the communications device to perform the communications functions of the communications apparatus.

[0110] The communication apparatus also includes infrastructure facilities, such as base stations, access points, and any other apparatus, device, or system that communicates with or controls the various apparatuses listed above, but are not limited to these. [Industrial Applicability]

[0111] The present disclosure is useful for intercom systems installed in apartment buildings. [Explanation of symbols]

[0112] 1,1a,1b Door machine 2,2a,2b repeater 3,3a,3b Indoor unit 4 Lobby Machine A1 Apartment complex

Claims

1. a control unit that interprets a CRC (Cyclic Redundancy Check) field and an ACK (Acknowledgement) field in information data of a DECT (Digital Enhanced Cordless Telecommunications) system as an information data CRC field in the information data; a radio unit that transmits and receives a radio signal including the information data and the information data CRC in the information data CRC field; A communication device having:

2. the radio unit receives the same information data through a first communication channel and a second communication channel; When the control unit determines that there is no error in the information data of the first communication channel based on the information data CRC of the first communication channel, the control unit discards the information data of the second communication channel. The communication device according to claim 1 .

3. When the control unit determines that there is an error in the information data of the first communication channel based on the information data CRC of the first communication channel, and when the control unit determines that there is no error in the information data of the second communication channel based on the information data CRC of the second communication channel, the wireless unit transmits information data of the second communication channel to the first communication device; The communication device according to claim 2 .

4. When the control unit determines that there is an error in the information data of the first communication channel based on the information data CRC of the first communication channel, and when the control unit determines that there is an error in the information data of the second communication channel based on the information data CRC of the second communication channel, the wireless unit transmits the information data subjected to the silence processing to the first communication device; The communication device according to claim 2 .

5. the control unit activates the first communication channel when receiving a control signal related to a call from a second communication device, and activates the second communication channel when connection with the second communication device is successful. The communication device according to claim 2 .

6. If the control unit fails to activate the second communication channel, the wireless unit communicates with the second communication device using the first communication channel. The communication device according to claim 5 .

7. Interpret a CRC (Cyclic Redundancy Check) field and an ACK (Acknowledgement) field in information data of a DECT (Digital Enhanced Cordless Telecommunications) system as an information data CRC field in the information data; receiving a wireless signal including the information data and the information data CRC in the information data CRC field; Communication method.

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