JP2005167751A - Electronic apparatus connectable to radio network - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic apparatus connectable to a radio network which is capable of preventing connection delay of an electronic apparatus making new connection with a radio network by an audio packet communicated in a line switching system or a data packet communicated in a packet switching system, and capable of notifying the communication contents to be notified in real time without delay. <P>SOLUTION: The electronic apparatus has a communication means for performing data transmission with another electronic apparatus via the radio network by an ACL packet of packet switching system, and audio transmission therewith via the radio network by the SCO packet of a line switching system. In this apparatus for transmission/reception of message data with another electronic apparatus, a communication means uses each field, FLOW, SEQN and ARQN which are used in the ACL data packet and not used in the SCO packet at the time of audio transmission/reception. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electronic device that can be connected to a wireless network and performs data communication by packet switching and voice communication by circuit switching in a time division slot.

  In recent years, various standards have been standardized for wireless networks, and devices having various applications have been connected to wireless networks of the same standard. For example, Bluetooth (trademark) has a specification that enables connection not only to computers but also to computer peripherals such as printers and scanners, and electronic devices such as facsimile apparatuses, audio apparatuses, and cordless telephones.

  Since a wireless network performs communication using wireless radio waves as a medium, if a plurality of devices transmit at the same time, transmission data collide with each other and communication is impossible. Therefore, in Bluetooth, the transmission timing is time-divided as slots and assigned to each electronic device so that transmission / reception data do not collide.

  A communication procedure in a cordless telephone which is an example of an electronic apparatus connectable to such a conventional wireless network will be described with reference to FIG.

  FIG. 5 shows a case where a cordless handset detects an interference when a cordless telephone set is connected to a cordless telephone set with two cordless phones A and B and a cordless cordless handset is newly connected. FIG. 6 is a diagram showing a procedure until an interference avoidance request is made to the master unit.

  The cordless phone's master unit and each slave unit are connected using Bluetooth procedures. In Bluetooth, voice data is communicated using a circuit switching type communication link of 64 Kbps called an SCO packet which is a voice packet.

  First, at the timing of T20 in FIG. 5, the two slave units A and B are in conversation with the other party via the public line network via the master unit. The “inquiry” from the child device C to be newly connected is a state in which the parent device is not responding because the synchronization with the wireless network called the piconet is not established.

  The voice from the master unit is transmitted to each slave unit A and B by an SCO packet that is communicated in a circuit-switched manner every 6 slots, and each slave unit A and B similarly transmits voice data by an SCO packet every 6 slots. Replying to the main unit.

  Also, a POLL (polling) packet “P” from the parent device to each of the child devices A and B is transmitted in a packet-switched manner using an empty slot of the SCO packet. In the example of FIG. 5, the slave units A and B that have received the polling packet return a NULL packet in a packet-switched manner, and therefore there are no other empty slots.

  When the slave unit A detects the interference of the radio wave from another electronic device at the timing of T21, the slave unit A performs frequency hopping by replying to the POLL packet the next time the POLL packet is sent from the master unit. Prepare to request the parent machine to change the pattern.

At the timing of T22, an “inquiry” from the child device C that is newly connected to the parent device of the wireless network is detected, and the parent device returns an “inquiry response”. Thereafter, at the timing of T23, the parent device returns an FHS response packet to the FHS packet from the child device C, and at the timing of T24, the parent device returns a NULL packet to the POLL packet of the child device C. In response to the connection request from the slave unit C, the connection response from the master unit is returned to the connection request from the slave unit C at the timing T26. A communication link with the machine can be connected.

  In the meantime, since the parent device, the child device A, and the child device B are periodically communicating the SCO packet that is the voice data, the POLL packet cannot be transmitted to the child device A and the child device B. Finally, at T27, a POLL packet is sent from the parent device to the child device A, and the child device A notifies the parent device of the presence of another electronic device using the same frequency by replying to the POLL packet, and a frequency hopping pattern Is requested to the parent machine.

  In this way, for the interference generated at the timing of T21, the slave A wants to transmit an interference avoidance request to the master, but until the timing of T27 at which the POLL packet that is polling from the master is transmitted. , Will be waited.

In the wireless switching system disclosed in Patent Document 1, when a main apparatus and a wireless dedicated telephone communicate in a time-division slot, a transmission frame is separated into an information communication frame and a control communication frame and transmitted, thereby performing information communication (during conversation). ), It is described that information communication (call) is not hindered even if control data is sent.
JP-A-8-316903

  However, in a conventional electronic device connected to a wireless network, communication is performed using a voice packet that is voice data in a circuit switching type, and a packet switching type data packet such as polling is communicating in the vacant slot. There is a problem that when an event to be urgently notified to a communication partner occurs, the notification is delayed.

  Also, in the wireless switching system of Patent Document 1, since only the information communication frame and the control communication frame are transmitted separately, when a plurality of wireless dedicated telephones are connected to the main apparatus, there is no empty slot due to the transmission frame. A similar problem is assumed to occur.

  Therefore, the present invention needs to prevent connection delay of a new electronic device to be connected to a wireless network and to notify in real time by using a voice packet communicated by a circuit switching method or a data packet communicated by a packet switching method. It is an object of the present invention to provide an electronic device that can be connected to a wireless network and can notify a certain communication content without delay.

  The present invention relates to an electronic apparatus having a communication means for transmitting and receiving a data packet for transmitting and receiving data by a packet switching type and a voice packet for periodically transmitting and receiving voice by a circuit switching type in a time division slot via a wireless network The communication means can be connected to a wireless network characterized by allocating a communication message to the field used in the data packet and unused in the voice packet and communicating as the voice packet. It is an electronic device.

As described above, the electronic device connectable to the wireless network of the present invention transmits / receives data to / from other electronic devices via the wireless network using packet-switched data packets, and transmits / receives voice to / from the circuit-switched type. It has a communication means that uses voice packets, and the communication means uses a field that is used in a data packet and unused in a voice packet when exchanging voice data for exchanging message data with other electronic devices. Thus, even when there is no empty slot due to a voice packet periodically transmitted and received in a circuit-switched manner, the message data transmitted and received by the data packet can be communicated by adding the message data to the voice packet. Therefore, communication of data packets that are transmitted and received in a packet-switched manner can be omitted, and an empty slot can be secured. In addition, since a control message requiring urgentness can be transmitted as a voice packet, it is possible to notify the communication partner in real time. Even if there is a new electronic device to be connected to the wireless network, it can be quickly connected.

  In addition, when the communication message is a transmission power control message, the field strength of the radio wave is weak, and errors in the received packet occur frequently. By adding a control message, it is possible to request transmission power control to the notification partner in real time.

  In addition, by using a communication message as a polling request message, a polling packet or the like can be requested from a communication partner even when an empty slot cannot be secured by a voice packet.

  Also, by setting the communication message to a voice packet reception error state, the communication partner can take measures against the reception error.

  The object of the present invention is to prevent delay of connection of an electronic device to be newly connected due to a voice packet that needs to be transmitted and received periodically, and to notify communication contents that need to be notified in real time without delay. Fields that are used in packet-switched data packets and unused in circuit-switched voice packets are used for exchanging message data with other electronic devices and communicated as voice packets.

  According to a first aspect of the present invention, there is provided an electronic apparatus having a communication means for transmitting / receiving data to / from another electronic apparatus via a wireless network using packet-switched data packets and transmitting / receiving voice using circuit-switched voice packets. The communication means uses a field that is used in a data packet and unused in a voice packet at the time of voice transmission / reception for exchanging message data with other electronic devices, and is not used in a voice packet. Is used for exchanging message data with other electronic devices, so that even if there are no empty slots due to periodically transmitted / received voice packets, the message data sent / received by the data packets are added to the voice packets. Can communicate.

  In the second invention, the message data is a message for transmission power control, and the message for transmission power control is used as message data, so that there are no empty slots due to voice packets periodically transmitted and received. In addition, communication can be performed by adding a power control message to the voice packet.

  In the third aspect of the invention, the message data is a polling request message. By using the polling request message as message data, even when there is no empty slot due to a periodically transmitted / received voice packet, A polling request message can be added to the electronic device for communication.

In the fourth aspect of the invention, the message data is in a voice packet reception error state, and the voice packet reception error state is used as message data, so that an empty slot can be used for a voice packet periodically transmitted and received. Even when there is no error, it is possible to communicate by adding an error occurrence state of the received packet.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a cordless telephone set, which is an example of an electronic apparatus that can be connected to a wireless network according to an embodiment of the present invention, connected to the wireless network.

  As shown in FIG. 1, a wireless network 1 is within a range in which a cordless telephone handset 3, a PDA (Personal Digital Assistant) 4, and a digital camera 5 having a communication function can be connected, centering on a cordless telephone base unit 2. I'm in. Each of these terminals communicates with the base unit 2 in a manner compliant with the Bluetooth specification, and the wireless network 1 is a wireless network called a piconet in the Bluetooth specification.

  The base unit 2 is connected to the public line network 6 by wire and can make a call via the public line network 6. The master unit 2 is connected to the Internet via a LAN (Local Area Network) 7 so that the PDA 4 can access a home page and a mail server, and the digital camera 5 can transmit images to the Internet. is there. In FIG. 1, the slave units 3a and 3b among the plurality of slave units 3 are connected to the master unit 2, and the slave unit 3c tries to connect to the place where the two slave units 3a and 3b are talking. It is in a state.

  FIG. 2 is a configuration diagram of a cordless telephone handset that is an example of an electronic device that can be connected to a wireless network according to an embodiment of the present invention. Hereinafter, the structure of the subunit | mobile_unit 3 is demonstrated based on FIG. 2 based on FIG.

  2, the handset 3 includes a radio unit 10, an antenna 11, a synchronous correlator 12, a received packet processing unit 13, a communication control unit 14, a speech decoder 15, a speaker 16, a microphone 17, A speech encoder 18, a transmission packet processing unit 19, and a power supply control unit 20 are provided.

The wireless unit 10 demodulates the radio wave received from the antenna 11 that protrudes and is attached to the outside of the housing of the slave unit 3, or modulates the radio wave transmitted to the antenna 11 to connect to the electronic device connected to the radio network. Communicate with the device. The radio unit 10 is an ISM (Industry Science)
A frequency band from 2.402 GHz to 2.480 MHz, called a medical band, is used to modulate and demodulate with a binary frequency shift keying method and output to a synchronous correlator.

  The synchronous correlator 12 determines whether the packet is in the wireless network to which the handset 3 is connected, based on the access code that is the head part of the packet that conforms to Bluetooth. In addition, a synchronization error occurring in a preamble, sync word, trailer, etc. constituting the access code is detected and notified to the communication control unit 14.

  When the synchronization correlator 12 determines that the packet received by the access code is a packet of the wireless network to which the handset 3 is connected, the synchronous correlator 12 outputs the packet to the received packet processing unit 13.

  The reception packet processing unit 13 includes a voice packet processing unit 25, a speech buffer 26, a data packet processing unit 27, and a data buffer 28.

  The received packet processing unit 13 is a packet header content that is an intermediate part of the received packet, and if it is an SCO packet that is audio data, the audio packet processing unit 25 stores the audio stored in the payload that is the final part of the packet. Data is output to the speech buffer 26 and stored. The received packet processing unit 13 checks an error from the error detection code stored in each part of the packet header and payload, and notifies the communication control unit 14 when a packet header error or payload error is detected.

  Further, if the received packet is an ACL packet used for data communication in a packet switching manner, the data packet processing unit 27 outputs the data stored in the payload which is the final part of the packet to the data buffer 28. Store.

  The speech decoder 15 decodes audio data, which is digital data stored in the speech buffer 26, converts it into analog, and outputs it as audio through the speaker 16.

  The communication control unit 14 notifies the radio unit 10, the synchronous correlator 12, the reception packet processing unit 13, and the transmission packet processing unit 19 to notify and control the timing for transmitting and receiving data as packets in the time division slot. Further, when the received packet is an SCO packet that is a packet of voice data, the communication control unit 14 stores a control message in a packet header that is an intermediate part of the packet from the voice packet processing unit 25. The bit is read and processing is performed according to its contents.

  Further, when there is information to be sent out, the communication control unit 14 controls the transmission packet generation unit 31 to set the information to be sent out in the bit of the control message in the packet header.

  Here, the format of the packet header and the control message by the communication control unit 14 will be described with reference to FIG. FIG. 3 is a diagram for explaining a packet used for an electronic device connectable to a wireless network according to an embodiment of the present invention, (a) is a diagram showing a packet format used for Bluetooth, b) is a diagram illustrating a control message.

  As shown in FIG. 3A, a packet is basically composed of three parts: an access code as a head part, a packet header as an intermediate part, and a payload as a final part.

  The access code is a synchronization establishment field in which basic information indicating a packet transmission destination is stored. The packet header is a communication control field for communication, and the payload is a data field in which user data used between electronic devices is stored.

  Next, the contents of the packet header will be described in detail according to the Bluetooth specification. The packet header is composed of AM_ADDR, TYPE, FLOW, ARQN, SEQN, and HEC.

  AM_ADDR is a field configured with 3 bits and storing an identifier for identifying a partner electronic device in the piconet called an active member address.

  TYPE is composed of 4 bits, and is a packet type type field that defines whether the packet is an SCO packet carrying voice data or an ACL packet carrying data other than voice (control information, etc.). .

FLOW is composed of 1 bit and is used for flow control of packets transmitted and received. That is, if all the data buffers for reception 28 are used and are full, FLOW
Is set to “0” and the packet is returned, it is possible to request the communication partner to temporarily stop the transmission of the packet. In the case of an SCO packet, the procedure is such that the packet is periodically transmitted and received, so that the speech buffer 26 secures an empty area. Therefore, normally, this FLOW is not used. That is, in the case of an SCO packet, “0” is set to FLOW at the time of transmission, and this is ignored on the receiving side.

  The ARQN is a field that is composed of 1 bit and notifies the packet transmission source whether an error has occurred in the received packet. The packet transmission source electronic device performs control such as retransmission using this field. Note that ARQN is not used in the SCO packet used for transmission / reception of voice data because it is not retransmitted. That is, in the case of an SCO packet, “0” is set to ARQN at the time of transmission, and is ignored on the receiving side.

  The SEQN is a management field that is composed of 1 bit and prevents duplicated retransmitted packets. The electronic device that transmits the packet toggles the SEQN every time it retransmits. Since retransmission is not performed in the SCO packet, SEQN is not used, and “0” is set at the time of transmission similarly to ARQN, and is ignored on the receiving side.

  HEC is composed of 8 bits and is a field for storing error detection codes for a total of 10 bits of AM_ADDR, TYPE, FLOW, ARQN, and SEQN. In this way, the Bluetooth packet header is defined.

  In the present embodiment, control fields [FLOW, SEQN] that are normally unused in SCO packets that transmit and receive audio data are used to exchange message data with a communication partner, or to request transmission power up / down, and to perform polling. Used for request / response.

  As shown in FIG. 3B, when [FLOW, SEQN], which is a control field of the packet header in the SCO packet, is [0, 0], it means that there is no message as notification content (conventional). Same as packet). The same meaning applies to the case where the slave unit is sent to the master unit and the case where the slave unit is sent to the slave unit.

  Further, when [FLOW, SEQN] is [0, 1] in the SCO packet, it indicates a request for increasing the transmission power of the radio wave to the communication partner. This may be the same content as LMP_incr_power_req and LMP_max_power in the ACL packet for data communication.

  Further, when [FLOW, SEQN] is [1, 0] in the SCO packet, it indicates a request to the communication partner to reduce the transmission power of the radio wave. This may be the same content as LMP_decr_power_req and LMP_min_power in the ACL packet for data communication.

  In addition, when [FLOW, SEQN] is [1, 1] in the SCO packet, when the slave unit transmits to the master unit, it indicates a POLL packet transmission request that the slave unit is polling, and is transmitted from the master unit to the slave unit. In this case, the parent device indicates a polling response request for the POLL packet.

  In this way, even in the SCO packet, it is used for notification of control messages such as transmission power up / down and polling request, so that even if there is no empty slot, it is electronically transmitted through the wireless network in a state close to real time. Communication between devices becomes possible.

[ARQN] is a field indicating whether or not an error has occurred in the data communication ACL packet. As shown in FIG. 3C, a field indicating whether or not an error has occurred in the received packet even in the SCO packet. Use as In this way, even in the SCO packet, the transmission power is increased in order to increase the electric field strength of the radio wave by notifying the transmission partner of the error occurrence status of the received packet. All warnings and statistical information can be accumulated.

  Returning to FIG. 2, the voice which is an analog signal input from the microphone 17 is converted into digital data by the speech encoder 18 and input to the transmission packet processing unit 19.

  The transmission packet processing unit 19 includes a speech buffer 30, a transmission packet generation unit 31, and a data buffer 32.

  The audio data converted as digital data by the speech encoder 18 is stored in the speech buffer 30.

  The transmission packet generation unit 31 generates audio data stored in the speech buffer 30 as an SCO packet, and is transmitted from the radio unit 10 via the antenna 11 under the control of the communication control unit 14. Also, the transmission packet generator 31 generates an ACL packet by reading out and packetizing the data generated by the communication controller 14 and stored in the data buffer 32. Like the SCO packet, the transmission packet generator 31 generates the antenna 11 from the radio unit 10. Sent through.

  When there is an instruction to increase or decrease transmission power supply from the communication control unit 14, the power supply control unit 20 controls the wireless unit 10 to supply power according to the instruction.

  These received packet processing unit 13, communication control unit 14, transmission packet processing unit 19, power supply control unit 20, speech decoder 15, speech encoder 18 and the like store a gate array, an MPU (Micro Processing Unit), and a control program. The read only memory (ROM) and the random access memory (RAM) used by the program for reading and writing can be used.

  For the speech buffers 26 and 30 and the data buffers 28 and 32, rewritable SRAM (Static Random Access Memory), DRAM (Dynamic Random Access Memory), or the like can be used.

  The operation of the electronic device connectable to the wireless network according to the embodiment of the present invention configured as described above will be described with reference to FIGS. FIG. 4 shows a case where the cordless telephone according to the embodiment of the present invention is in a call when the cordless telephone is newly connected to the place where one cordless phone 2 is talking and two cordless phones 3a and 3b are talking. It is the figure which showed the procedure until the subunit | mobile_unit a detects an interference and makes an interference avoidance request | requirement to a main | base station.

  The base unit 2 of the cordless telephone and each of the sub units 3a, 3b, 3c are connected by Bluetooth procedure.

  First, in FIG. 4, the two slave units 3 a and 3 b are in conversation with the other party via the public line network 6 via the master unit 2. Regarding the inquiry from the child device 3c to be newly connected, since the synchronization with the wireless network 1 called piconet is not established, the parent device 2 is not responding.

For example, an SCO packet transmitted from the parent device 2 to the child device 3a is demodulated by the wireless unit 10 of the child device 3a and is a packet in the wireless network to which the child device 3a is connected by the synchronous correlator 12. When it is determined, the packet is output to the received packet processing unit 13. In the received packet processing unit 13, the voice packet processing unit 25 stores the voice data stored in the payload of the SCO packet in the speech buffer 26 based on the discrimination from the SCO packet, and the voice data read from the speech buffer 26 is The sound is output from the speaker 16 via the decoder 15.

  The communication control unit 14 of the child device 3a reads the communication control field of the packet header from the voice packet processing unit 25, and analyzes the communication content of each field of FLOW, SEQN, and ARQN. If all the fields are [0], communication is continued as a normal SCO packet.

  When transmitting the SCO packet which is audio | speech data from the subunit | mobile_unit 3a, it is converted into digital data with the speech encoder 18 input from the microphone 17, becomes audio | speech data, and is stored in the speech buffer 30. FIG. Then, the transmission packet generation unit 31 receives the audio data from the speech buffer 30 and outputs it as a SCO packet to the radio unit 10 and is transmitted to the base unit 2. The SCO packet transmitted from the parent device 2 to the child device 3b is similarly processed by the child device 3b, and the SCO packet is transmitted from the child device 3b to the parent device 2.

  In this way, the “voice” from the base unit 2 is transmitted to the slave units 3a and 3b by SCO packets every 6 slots, and the slave units 3a and 3b similarly send “voice” by the SCO packet every 6 slots. Replying to base unit 2.

  As described above, in FIG. 4, two of the slave units 3a and 3b are in conversation with the communication partner via the public line network 6 via the master unit 2, and a new slave unit 3c is about to connect. At T1 shown in FIG. 4, the slave unit 3c transmits an “inquiry” packet in order to newly connect to the master unit 3c of the wireless network, but since the synchronization with the master unit 2 is not established, 3c is a state where it cannot connect with a main | base station.

  At time T2, the parent device 2 detects an “inquiry” from the child device 3c, and the parent device 2 returns an “inquiry response”. After that, an FHS response packet is returned to the FHS packet from the slave unit 3c at the timing of T3, and a NULL packet of the master unit 2 is returned to the polling packet (POLL packet) from the slave unit 3c at the timing of T4. In response to the connection request from the slave unit 3c at the timing T5, the connection response from the master unit 2 is returned in response to the connection request from the slave unit 3c at the timing T6. The slave unit 3c can connect a communication link with the master unit 2.

  Next, a case will be described in which a handset during a call receives radio wave interference from another electronic device. At the timing of T7 after the FHS packet and the FHS response packet transmission / reception (T3) are performed between the slave unit 3c and the master unit 2, for example, the communication control unit 14 of the slave unit 3a transmits a radio wave from another electronic device. When the interference is detected, the handset 3a makes a polling request by [FLOW, SEQN] of the packet header of the SCO packet at the timing of T8 after 6 slots which is the transmission timing of the voice data. That is, the communication control unit 14 notifies the transmission packet processing unit 19 of [FLOW, SEQN] of the packet header of the SCO packet sent at T8 as [1, 1], and the transmission packet processing unit 19 generates a packet to generate a wireless unit. 10 and transmit to the base unit 2 via the antenna 11.

  The SCO packet is transmitted from the parent device 2 with [FLOW, SEQN] set to [1, 1] at the timing of T9, which is the next voice data communication between the parent device 2 and the child device 3a, and the packet is transmitted from the voice packet processing unit 25. The header control message is read into the communication control unit 14, analyzed there, and recognized as a polling response request. Then, it is scheduled to send a request content (in this case, an interference avoidance request) in a polling response packet returned in response to a POLL packet from the next base unit.

  At the timing of T10, the parent device 2 transmits a POLL packet to the child device 3a. The subunit | mobile_unit 3a returns a polling response packet to the main | base station 2 at the next timing which received this POLL packet, and transmits an interference avoidance request | requirement in this polling response packet. In this way, even when the SCO packet, which is a voice packet, is periodically transmitted and received, the POLL packet can be sent to the base unit 2 by transmitting the control message on the SCO packet. The content such as the interference avoidance request can be sent to the parent machine at an early stage.

  The above is a polling request and a polling response request as control messages. Similarly, [0, 1] is set in [FLOW, SEQN] of the packet header of the SCO packet, and the parent device 2 transmits to the child device 3. In the case of transmission, the communication control unit 14 of the slave unit 3 analyzes that the request for increasing the transmission power of the radio wave is made, and instructs the power supply control unit 20 to increase the transmission power. The power supply control unit 20 can increase the transmission power by increasing the supply of transmission power to the radio unit 10.

  When [FLOW, SEQN] is [1, 0], the communication control unit 14 instructs the power supply control unit 20 to reduce transmission power, and the power supply control unit 20 supplies transmission power to the radio unit 10. The transmission power can be reduced by lowering.

  Further, the communication control unit 14 notified of the synchronization error detected by the synchronization correlator 12, the packet header error detected by the reception packet processing unit 13 or the payload error, [ARQN] of the packet header of the SCO packet to be transmitted next. ] Is set to [1], the transmission packet generator 31 is instructed to know that an error has occurred in the SCO packet, which is a voice packet transmitted to the base unit 1 last time, thereby increasing the transmission power. It is possible to take measures such as measuring.

  A communication message is assigned to a field that is used in a packet-switched data packet and unused in a circuit-switched voice packet, and is transmitted as a voice packet, so that even a control message that requires an emergency is transmitted in a voice packet Therefore, the present invention can be applied to uses that require notification to a communication partner in real time.

The figure which the cordless telephone cordless handset which is an example of the electronic device which can be connected to the wireless network which concerns on embodiment of this invention is connected to the wireless network 1 is a configuration diagram of a cordless telephone handset that is an example of an electronic device that can be connected to a wireless network according to an embodiment of the present invention. It is a figure explaining the packet used for the electronic device which can be connected to the wireless network which concerns on embodiment of this invention, (a) The figure which shows the packet format used for Bluetooth, (b) The message for control is demonstrated (C) Diagram explaining the SCO packet The figure which showed the procedure until a subunit | mobile_unit detects an interference and makes an interference avoidance request | requirement to a main | base station in communication with the main | base station and a subunit | mobile_unit which concerns on embodiment of this invention The figure which showed the procedure until the cordless handset detects the interference in the communication between the cordless phone and the cordless phone

Explanation of symbols

1 Wireless network 2 Base unit 3, 3a, 3b, 3c Slave unit 4 PDA
5 Digital camera 6 Public network 7 LAN
DESCRIPTION OF SYMBOLS 10 Radio | wireless part 11 Antenna 12 Synchronous correlator 13 Reception packet processing part 14 Communication control part 15 Speech decoder 16 Speaker 17 Microphone 18 Speech encoder 19 Transmission packet processing part 20 Power supply control part

Claims (4)

In an electronic apparatus having a communication means for performing transmission / reception of data with a packet-switched data packet with another electronic apparatus via a wireless network and performing transmission / reception of a voice with a circuit-switched voice packet,
The communication means uses a field used in the data packet and unused in the voice packet for exchanging message data with the other electronic device when transmitting and receiving the voice. An electronic device that can be connected to a network. 2. The electronic apparatus connectable to a wireless network according to claim 1, wherein the message data is a transmission power control message. The electronic device connectable to a wireless network according to claim 1, wherein the message data is a polling request message. 4. The electronic apparatus connectable to a wireless network according to claim 1, wherein the message data is in a voice packet reception error state.

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