JPH0787562A - Digital radio portable terminal equipment - Google Patents

Abstract

PURPOSE:To obtain a terminal which is capable of performing a control so that an interference avoiding measure more effectively functions by executing a prescribed interference avoiding means based on the number of times of counted error of transmission data and the comparison result of interference avoiding request data. CONSTITUTION:A control part 11 performs the controls (a counting, a comparison and a control) of the various kinds of operations of a device by using a RAM 13 storing data and an arithmetic result in accordance with a microprogram to be stored in a ROM 12. When a CRC error is detected in the data that the CRC processing part within a TDMA signal processing part 24 receives, the control part 11 counts the number of times of CRC error by a CRC counter. If the error is not detected, the counter is reset. The SACCH of received data is stored and the SACCH is compared. If it is the same data, the number of times is counted. When the CRC makes errors n times and SACCH comparison data coincide m times, a slot switching and a frequency switching are performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital wireless mobile terminal device, and more particularly to a digital wireless mobile terminal device having an interference avoidance control function in digital wireless communication.

[0002]

2. Description of the Related Art A current digital wireless mobile terminal device such as a PHP (Personal Handy Phone) uses a 1.9 GHz band as a frequency band to be used and a carrier interval of 300 k.
Hz, the access method is 4-channel multiplex multi-carrier TDMA (Time Division Multiple Access), and the transmission method is TDD (Time Division Duplex).
plex: Time-division replication). In this access method and transmission method, a signal on one frequency is divided into, for example, 8 slots per 5 milliseconds, and 4 slots are provided for downlink (base station →→ terminal) and 4 slots are provided for uplink (terminal → base station). Assign slots. That is, four bidirectional communication channels can be simultaneously set on one carrier.

Data between the terminal and the base station is π / 4.
Shift QPSK (quadrature phase shift keying) is used, and the voice coding method is ADPCM (Adaptive Differential PC).
M: Adaptive Differential Pulse Code Modulation) method is used to compress and encode a 64 kbit / sec PCM voice signal to 32 kbit / sec for transmission.

In the PHP protocol, a wireless channel link is established between a terminal and a base station, and a link / channel establishment phase for selecting a protocol type required for call connection and a protocol selection for a call setup or communication phase. It is divided into a service / channel establishment phase in which the communication is performed and a communication phase in which communication is performed by the channel and protocol set in the previous phase, and wireless channels are switched or disconnected as necessary. The carrier frequency is divided into one for control and one for communication, and the control carrier is always shared by each terminal. The communication carrier confirms and uses a vacant carrier and slot at each communication at each terminal, and when receiving a radio wave interference, moves to another carrier or slot to avoid the interference.

By the way, an error control function is required to detect an error in data that occurs during data transmission and perform correct data transmission. As the error detection method, a parity bit is added for each character unit to detect a 1-bit error, and in addition to the vertical parity bit, a horizontal parity bit is added to the corresponding bit position of each character in character string units. , A vertical / horizontal parity check system that can detect multiple bit errors,
Alternatively, there is a cyclic check method in which a cyclic code is added to each character string so that a burst error can be detected.

[0006]

In mobile communication, since a multiple propagation path is formed by reflection / diffraction of a building near a mobile station, a received wave may be a composite wave of multiple waves having different phases and amplitudes. Many. When the mobile station moves, the phase relationship between the multiple waves forming the received wave changes, so fading occurs in which the amplitude and phase of the received wave change intricately. If fading occurs, the interference wave may be demodulated when the desired wave is demodulated.

In the conventional interference avoidance method, when it is determined that the data is erroneous due to the interference, the receiving side attempts to avoid the interference by switching the slot to the transmitting side while keeping the communication channel or switching the frequency. However, if there is continuous interference, it is highly possible that the signal for switching slots is also incorrect. In this case, there is a drawback that the slot cannot be switched forever and the link is reestablished.

Therefore, an object of the present invention is to provide a digital radio portable terminal device which can be controlled so that interference avoidance measures such as slot switching and frequency switching can function more effectively.

[0009]

In order to achieve the above object, a digital wireless mobile terminal device according to the invention of claim 1 has a storage means for storing data requesting interference avoidance among the transmitted data, and a transmission means. Error detecting means for detecting an error in the received data, counting means for counting the number of data errors detected by the error detecting means, interference avoidance request data stored in the storing means, and newly transmitted data. The comparison means for comparing the interference avoidance request data and the control means for executing a predetermined interference avoidance means based on the number of errors counted by the counting means and the comparison result by the comparison means are provided.

According to a second aspect of the present invention, there is provided storage means for storing data requesting interference avoidance among the transmitted data, error detecting means for detecting an error in the transmitted data, and the error detecting means. Counting means for counting the number of detected data errors, comparing means for comparing that the interference avoidance request data stored in the storage means and the newly transmitted interference avoidance request data are the same data, And a control means for executing a predetermined interference avoiding means when the comparing means determines that the comparison results are the same when the number of errors counted by the counting means is a predetermined value or more.

The error detecting means may be a C added to the transmitted data as described in claim 3, for example.
An error may be detected using RC (Cyclic Redundancy Check Code).

Further, as a preferred mode, the interference avoidance request data may be slot or frequency switching request data as described in claim 4, for example.

The interference avoiding means may be means for switching a transmission / reception slot or a transmission / reception frequency as described in claim 5, for example.

[0014]

In the present invention, the error of the data transmitted by the error detecting means is detected, and the number of data errors detected by the counting means is counted. Then, the comparison means compares the interference avoidance request data stored in the storage means with the newly transmitted interference avoidance request data, and determines that the counted number of errors is equal to or greater than a predetermined value and the comparison result is the same. At this time, the control means controls to switch the transmission / reception slot or the transmission / reception frequency. Therefore, control interference avoidance measures such as slot switching and frequency switching function more effectively.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 10 are diagrams showing an embodiment of a digital wireless mobile terminal device according to the present invention, which is an example applied to a digital cordless telephone device.

First, the structure will be described. FIG. 1 is a block diagram of a digital cordless telephone device. In FIG. 1, 1
Reference numeral 1 denotes a control unit (counting means, comparison means, control means) for controlling the entire apparatus according to a predetermined protocol, which is composed of a CPU and the like. The control unit 11 controls various operations of the digital cordless telephone device including the interference avoidance processing described later by using the RAM 13 that temporarily stores data and calculation results according to the microprogram stored in the ROM 12. The control unit 11 includes a key operation unit 14 provided with a numeric keypad and various function keys, a display unit 15 including an LCD for displaying a caller number, time, call duration, call charge, etc., and a prerecorded response. A recording / reproducing circuit 16 composed of a cassette tape or an IC memory for sending a message and recording a message from the other party, and a memory (storing means) for storing various data including voice data.
17 is connected.

Further, the digital cordless telephone device is
A high frequency unit 22 which receives a signal in the transmission / reception radio frequency (RF) frequency band from the antenna 21 or converts a voice signal digitally modulated by the modem 23 into a transmission / reception radio frequency (RF) and emits it from the antenna 27 into the air.
A modem 23 for digitally demodulating an RF received voice signal or for digitally modulating a voice signal TDMA processed by the TDMA signal processing unit 24, and a radio frequency for time division, and a transmission / reception signal in burst form in a specific time zone. TDMA (Time Division Multiple Acces)
s: time division multiple access) processing, a TDMA signal processing section 24, a speech codec 25 for compressing / expanding a digital voice signal, and a digital signal converted into an analog signal and output to a receiver 28 via an amplifier 27. Or a PCM codec 26 that encodes and outputs a voice signal input by the transmitter 29 into a PCM digital signal, a receiver 28 such as a speaker, a transmitter 29 such as a microphone, and a ringer for ringing. Three
It is composed of 0 and. The handset 28 and the transmitter 29 are configured as a handset which is integrated by being connected via a grip portion.

The high frequency unit 22 performs a frequency conversion process, and is composed of a receiving unit 31, a transmitting unit 32, a PLL synthesizer 33, and an antenna switch 34 for distributing transmission / reception. The receiver 31 includes the antenna 21.
The signal received by the antenna switch 34 and input through the antenna switch 34 is frequency-converted by a two-stage mixer to obtain 1.9 GHz.
The frequency of z is converted to an intermediate frequency (IF) signal in the range of 150 to 250 MHz and further around 10 MHz.

The transmitter 32 mixes the π / 4 shift QPSK modulated wave input from the modem 23 with a mixer at 1.9 GHz.
The frequency is converted into z, and the antenna 21 radiates it through the antenna switch 34. The PLL synthesizer 33 oscillates locally for frequency conversion in the receiver 31 and the transmitter 32. The modem 23 is a π / 4 shift QPSK
The modulation / demodulation processing of the receiving unit 3 is performed on the receiving side.
The IF signal from 1 is demodulated, separated into IQ data, and transmitted to the TDMA signal processing unit 24 as a data string. Also,
On the transmission side, IQ data is created from the data transmitted from the TDMA signal processing unit 24, and π / 4 shift QPS is generated.
The K is modulated and output to the transmission unit 32.

The TDMA signal processing section 24 performs frame synchronization and slot format processing (see FIG. 2). That is, on the receiving side, a slot is taken out from the data (frame) sent from the modem 23 at a predetermined timing, scrambling is released, configuration data is taken out from the format of this slot, and control data is sent to the control unit 11. , Voice data is speech codec 2
5 is transmitted. On the transmission side, control data is added to the voice data transmitted from the speech codec 25 to create a slot, the slot is scrambled, the slot is inserted into the frame at a predetermined timing, and the frame is transmitted to the modem 23.

The speech codec 25 compresses / expands digital data. That is, on the receiving side,
The ADPCM audio signal (4 bits × 8 kHz = 32 kbps) sent from the TDMA signal processing unit 24 is decoded into a PCM audio signal (8 bits × 8 kHz = 64 kbps), expanded, and output to the PCM codec 26. On the transmission side, the PCM audio signal sent from the PCM codec 26 is compressed by being encoded into an ADPCM audio signal and output to the TDMA signal processing unit 24.

The PCM codec 26 performs analog / digital conversion processing. On the receiving side, the analog audio signal obtained by D / A converting the PCM audio signal sent from the speech codec 25 is output to the amplifier 27 to drive the speaker 28. On the transmitting side, the analog voice signal input from the microphone 29 is A / D converted and a PCM voice signal is output to the speech codec 25. It also controls volume / ringer / tone signals.

FIG. 2 is a block diagram showing the details of the TDMA signal processing unit 24, and FIG. 3 is a diagram showing the configuration of slots created by the TDMA signal processing unit 24. In FIG. 2, the TDMA signal processing unit 24 uses a CI
(Channel type) detector 41, UW (synchronous word) detector 42, scramble processor 43, CRC (cyclic re)
dundancy check: Cyclic redundancy check code) processing section 44, confidential speech processing section 45, voice data buffers 46 and 47, control data buffers 48 and 49, and timing generation section 50.

The CI detection unit 41 detects the CI (channel type) from the data string transmitted from the modem 23 and outputs it to the control unit 11. The UW detection unit 42 detects UW (synchronization word) from the data string transmitted from the modem 23 and outputs it to the control unit 11. The scramble processing unit 43
This is a process for making the occurrence probabilities of "1" and "0" of data constant, and the details will be described later with reference to FIGS. CR
The C processing unit (error detection means) 44 uses a CRC for error detection.
Encoding is performed by (cyclic redundancy check code). Also, C
An error in the transmitted data is detected by analyzing the RC. This code is not only a random code but also has a burst error detection capability and is capable of error correction.

The confidential talk processing unit 45 is a simple confidential talk processing that scrambles the TCH information based on the data (hereinafter referred to as the secret key code) obtained by the PS key input,
Details will be described later with reference to FIG. 7. The audio data buffers 46 and 47 temporarily store the audio data and output the audio data according to a predetermined read signal. The control data buffers 48 and 49 temporarily store the control data and output the control data according to a predetermined read signal. The timing generation unit 50 receives the TDMA signal according to the control signal from the control unit 11.
The timing signal is output to each unit of the signal processing unit 24 and other blocks. The slot is taken out / inserted and each component is taken out / inserted according to this timing signal.

Here, the slots include a control physical slot and a communication physical slot. The control physical slot is
This is a slot that is commonly used by each user and in which functional channels required for control such as the setting of communication physical slots are set.The communication physical slot is used exclusively for communication by each user, and individual call This is a slot in which a control channel and information channel required for setting control are set.

FIG. 3 is a diagram showing a format of the information channel (TCH). In this figure, the information channel (TCH) is a ramp time (R) for transient response,
Start symbol (SS), preamble (PR) for bit synchronization between transmission system and reception system, synchronization word (UW) that distinguishes physical slots, channel type (CI), individual cell channel SACCM (SA), data ( I) and a cyclic code (CRC) for error detection.
As shown in FIG. 3, the data transmission format in a digital cordless telephone is as follows: sync word (UW), voice data as data (I), cyclic code (CR) for error detection.
C) is provided, and an error is detected using a CRC after the voice data.

The scramble processing section 43 employs the following scramble pattern and scramble method. As a scrambling method, scrambling is essential in this standard, and is applied to each of the control physical slot and the communication physical slot as follows.

Scramble pattern The scramble pattern is the same for both CS transmission and PS transmission, and "1111111111" is used as the initial value of the scramble pattern register of the control physical slot. The initial value of the scramble pattern register of the physical slot for communication is the lower 9 bits of the identifying ID (CS-ID).
Use the pattern with (fixed to). Since it is assumed that the additional ID is not used in the private system, there is a possibility that the scramble pattern register initial values match between adjacent CSs and intelligible crosstalk occurs. As an example of means for avoiding the occurrence of intelligible crosstalk, there is a method of copying the lower 9 bits of the system call code and setting it as an additional ID.

Scramble Method FIG. 4 is a diagram showing a scramble execution procedure, and FIG. 5 is a diagram showing a descramble execution procedure for returning converted data to original serial data. The PN pattern used is the following 16-stage PN pattern. PN (16, 12, 3, 1) A configuration example of a shift register that generates this PN pattern is shown in FIG. 6, where S0 to S15 are shift registers and “+” is Ex-OR. Further, this scramble processing is of a reset type in which a register initial value is set for each frame. Since it is a reset type, it is necessary to synchronize between scramble and descramble, but the error does not spread even if a bit error occurs due to the transmission path.

The confidential processing section 45 uses the following processing method. In this standard, a standard for public use and an option for private use in this standard are defined as a procedure of a simple secret use method for scrambling TCH information based on a secret key code such as PS key input.
Here, the secret key code is a hexadecimal 4-digit number used for the initial value of the scramble processing register. However,
In the case of "0000", the data after scramble is the same as before scramble, and there is no concealment effect. The secret key code is transmitted by a secret key setting message (standard for public use, optional for private use) in the service channel establishment phase.

FIG. 7 is a diagram showing an example of the secret scramble process. As described above, the shift register initial value for the scramble process is generated from the secret key code notified from the PS. Further, the confidential communication function is applied to the TCH after the secret key setting message in the service channel establishment phase is sent from the PS to the CS, and this starts the confidential communication process.

Next, the operation will be described. The digital cordless telephone device of this embodiment is characterized in that the control section 11 performs interference avoidance control in digital wireless communication, but the interference avoidance control is applied to the digital cordless telephone device. Therefore, first, the overall operation of the digital cordless telephone device will be described.

As shown in FIG. 1, the voice from the partner station is received through the antenna 21 after being converted into a baseband signal by the high frequency section 22, and the received voice signal is digitally demodulated by the modem 23 to be processed by the TDMA signal processing section. Two
4 is output. The TDMA signal processing unit 24 controls the reception timing based on the control signal (carrier synchronization, bit synchronization, frame synchronization signal) added to the transmission signal so that the received digital signal does not collide with the signal at the time of transmission. The signal sent in burst form is converted to the original transmission rate to extract the audio signal. TDMA signal processing unit 2
The digital audio signal taken out by 4 is expanded by the speech codec 25 and the ADPCM codec 26
Is converted into an analog voice signal and is emitted from the handset 28 via the amplifier 27.

On the other hand, the voice signal input from the transmitter 29 is converted into a PCM digital signal by the PCM codec 26, and the converted digital signal is data-compressed by the speech codec 25 and the TDMA signal processing unit 2
4 is output. The TDMA signal processing unit 24 performs burst transmission control for transmitting signals in burst at the transmission timing shown in FIG. 8 and outputs a burst signal to be transmitted to the modem 23. The transmission burst signal input to the modem 23 is digitally modulated here and output to the high frequency unit 22,
The radio frequency is converted into a radio frequency by the high frequency unit 22 and is emitted into the air through the antenna 21.

Further, the control section 11 executes an interference avoidance process (FIG. 10) which will be described later, controls the mode switching and the state based on the key operation information from the key operation section 14, and displays based on the control result. Control is performed such as sending a signal to the display unit 15 or ringing the ringer 30 when an incoming call is received from the TDMA signal processing unit 24.

FIG. 8 is a diagram showing a transmission / reception format in the next-generation cordless. In the digital cordless telephone device, when the base unit and the handset communicate basically by using the same frequency, as shown in the transmission / reception timing in the normal standby state of FIG. At times, the slave unit is at the reception timing Rx. Transmission / reception between the master unit and the slave unit is performed at the timing shown in FIG. 8, for example, transmission / reception timing of Tx → Rx from the master unit to the slave unit, and Tx → R from the slave unit to the master unit.
It is transmitted at the transmission / reception timing of x.

As the reception (RX) of the slave unit, an error detection CRC (Cyclic Redundancy Check Code) sent from the master unit is compared after the reception to perform error detection. At that time, if the CRC is incorrect due to the influence of interference as shown in FIG.
SACCH (for details, see the format of the information channel (TCH) in FIG. 3), DAT
It can be determined that either A or CRC has an error. Therefore, the number of times the CRC is erroneous is counted, and when the error is repeated many times, slot switching processing or frequency switching processing is performed for the purpose of avoiding interference. But,
Even if the slot switching process or the frequency switching process is performed, the slot and frequency for the next transmission / reception are the communication channel, and the data is exchanged at the slot / frequency which is said to have many CRC errors. It may be very difficult to recognize where to switch to each other.

On the other hand, the CRC error is SACCH (16b
it), DATA (160 bit), CRC (16 bi)
In t), even if 1 bit is wrong, it is detected as an error, so that the SA to which the slot switching data is transmitted is not necessarily required.
The CCH data is not always incorrect. Therefore, in this embodiment, if the retransmission request for slot switching and frequency switching is issued several times and the same data is received several times, SAC is performed.
It is judged that there is no error in the CH data, and software control is performed to perform interference avoidance processing. Here, CRC is limited to the case where the same data is received several times.
This is because if the error is caused by an error in the SACCH and if the master unit and the slave unit move to different slots, it is necessary to disconnect the line and re-establish the link.

That is, the data error due to the interference is not considered to be only when all the data sent in one slot is incorrect, and the slot switching is possible as long as the signal necessary for the slot switching can be received. Paying attention to this point, if the same slot switching signal can be received even if it is determined that there is always an error in the middle of the data after requesting retransmission of the data for slot switching several times,
This signal is judged as reliable data and the slot is switched.

FIG. 10 is a flowchart showing the interference avoiding process, which is executed by the control unit 11. First, in step S10, the data is received. In step S12, it is determined whether or not the received data has a CRC error. If there is no CRC error, the process returns to step S10. If there is a CRC error, the number of CRC errors is counted by the CRC counter in step S14, while if there is no CRC error, step S1.
Reset the CRC counter at 5.

Then, the SACCH of the data received in step S16 is stored, and the SACCH is compared in step S18 to determine whether or not they are the same data. SACC
If the same data is compared by comparing H, the number of times is counted by the SACCM counter in step S20.
When CHs are compared and if they are not the same data, the SACCM counter is reset in step S21. This allows SAC
The number of times that there is no error in the CH data is counted.

In step S22, the CRC is erroneous n times,
Also, it is determined whether or not the SACCH comparison data matches m times, the CRC is erroneous n times, and the SACCH comparison data is m times.
When the numbers match, the slot is switched in step S24,
The frequency is switched and the processing of this flow is ended.
That is, in this case, the retransmission request for slot switching and frequency switching is issued many times, and the same data is received many times accordingly, so it is determined that there is no error in the SACCH data, and interference avoidance measures are taken. To do.

As described above, the digital wireless mobile terminal device of the present embodiment is a PCM that converts a voice signal input by the control unit 11 and the transmitter 29 into a PCM digital signal.
A CODEC 26, a speech CODEC 25 for compressing / expanding a digital voice signal, a TDMA signal processing section 24 for performing TDMA processing for transmitting a transmission / reception signal in burst in a specific time zone by time division of a radio frequency.
The modem 23 that digitally modulates the voice signal that has been TDMA processed by the MA signal processing unit 24, and the transmission / reception radio frequency (R
C) in the TDMA signal processing unit 24, which is provided with a high frequency unit 22 which converts the frequency into F) and emits it from the antenna 21 into the air.
When the RC processing unit 44 detects that there is an error in the transmitted voice data, the control unit 11 requests the resending of the data of the slot switching several times, and on the other hand, there is always an error in the middle of the data. Even if it is judged, if the same slot switching signal can be received, this signal is judged as reliable data and the slot is switched.Therefore, control interference avoidance measures such as slot switching and frequency switching are taken. Become more effective.

Although the present embodiment is an example applied to a digital cordless telephone device as a digital wireless portable terminal device, it may be used in any device as long as it transmits and receives data by wireless communication. Needless to say, the type and number of each member constituting the device, the control method, and the like may be any ones.

[0046]

According to the present invention, the error of the data transmitted by the error detecting means is detected, the number of errors of the data detected by the counting means is counted, and the interference avoidance stored in the storing means by the comparing means is avoided. When the request data and the newly transmitted interference avoidance request data are compared and it is determined that the number of counted errors is equal to or greater than a predetermined value and the comparison result is the same, the control means determines the transmission / reception slot or the transmission / reception frequency. Since it is controlled to switch,
Control interference avoidance measures such as slot switching and frequency switching can be made to function more effectively, and effective effects can be obtained by applying them to a portable digital radio in which the interference situation constantly changes.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of an embodiment of a digital wireless mobile terminal device according to the present invention.

FIG. 2 is a diagram showing the TD of the digital wireless mobile terminal device of the embodiment.
It is a block diagram of a MA signal processing unit.

FIG. 3 is a diagram showing a format of an information channel (TCH) of the digital wireless mobile terminal device of the embodiment.

FIG. 4 is a diagram showing an execution procedure of scrambling of the digital wireless mobile terminal device of the embodiment.

FIG. 5 is a diagram showing a descrambling execution procedure of the digital wireless mobile terminal device of the embodiment.

FIG. 6 is a PN of the digital wireless mobile terminal device of the embodiment.
It is a figure which shows the example of a shift register structure which produces | generates a pattern.

FIG. 7 is a diagram showing an example of a secret scramble process of the digital wireless mobile terminal device of the embodiment.

FIG. 8 is a diagram showing a transmission / reception format of the digital wireless mobile terminal device of the embodiment.

FIG. 9 is a diagram for explaining the influence of interference of the digital wireless mobile terminal device of the embodiment.

FIG. 10 is a flowchart showing an interference avoiding process of the digital wireless mobile terminal device of the embodiment.

[Explanation of symbols]

 11 control unit (counting means, comparison means, control means) 12 ROM 13 RAM 14 key operation unit 15 display unit 16 recording / reproducing circuit 17 memory (storage unit) 21 antenna 22 high frequency unit 23 modem 24 TDMA signal processing unit 25 speech codec 26 PCM codec 28 Receiver 29 Transmitter 31 Receiver 32 Transmitter 33 PLL synthesizer 34 Antenna switch 41 CI (channel type) detector 42 UW (synchronization word) detector 43 Scramble processor 44 CRC processor (error detector) 45 Confidential processing unit 46,47 Voice data buffer 48,49 Control data buffer 50 Timing generation unit

Claims (5)

[Claims] 1. A storage unit for storing data requesting interference avoidance among the transmitted data, an error detection unit for detecting an error in the transmitted data, and an error in the data detected by the error detection unit. Counting means for counting the number of times, a comparison means for comparing the interference avoidance request data stored in the storage means with the newly transmitted interference avoidance request data, and the number of errors counted by the counting means and the comparison A digital wireless mobile terminal device comprising: a control unit that executes a predetermined interference avoiding unit based on a comparison result of the unit. 2. Out of the transmitted data, storage means for storing data that requires interference avoidance, error detection means for detecting an error in the transmitted data, and error in the data detected by the error detection means. The counting means for counting the number of times, the comparing means for comparing the interference avoidance request data stored in the storage means with the newly transmitted interference avoidance request data are the same data, and the counting means When the number of errors is greater than or equal to a predetermined value and the comparison means determines that the comparison results are the same, a control means for executing a predetermined interference avoiding means is provided, and the digital wireless mobile terminal device is provided. . 3. The error detecting means detects an error using a CRC (Cyclic Redundancy Check Code) added to the transmitted data, according to claim 1. Digital wireless mobile terminal device. 4. The digital wireless mobile terminal device according to claim 1, wherein the interference avoidance request data is slot or frequency switching request data. 5. The digital wireless mobile terminal device according to claim 1, wherein the interference avoiding unit is a unit that switches a transmission / reception slot or a transmission / reception frequency.