JP3266990B2 - Digital wireless portable terminal - 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 portable terminal, and more particularly, to a digital wireless portable terminal having an interference avoidance control function in digital wireless communication.

[0002]

2. Description of the Related Art At present, a digital radio portable terminal device, for example, a PHP (Personal Handy Phone) uses a 1.9 GHz band as a working frequency band 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 duplex). In this access method and transmission method, a signal on one frequency is divided into, for example, eight slots per 5 milliseconds, and four slots are downlink (base station →→ terminal) and four slots are uplink (terminal → base station). Assign slots. That is, four bidirectional communication channels can be simultaneously set on one carrier.

[0003] Data between a terminal and a base station is π / 4.
Shift QPSK (Quadrature Phase Shift Keying) is used, and the audio coding method is ADPCM (Adaptive Differential PC).
(M: Adaptive Differential Pulse Code Modulation) The PCM audio signal of 64 kbit / sec is compressed and encoded to 32 kbit / sec and transmitted.

[0004] The PHP protocol establishes a radio channel link between a terminal and a base station and selects a type of a protocol necessary for call connection. A link channel establishment phase, and a protocol selection in a call setting and communication phase. This is divided into a service channel establishment phase for performing communication, and a communication phase for performing communication using the channel and protocol set in the previous phase and switching or disconnecting a wireless channel as necessary. The carrier frequency is divided into those for control and those for communication, and the control carrier is always shared by each terminal. The carrier for communication is used after confirming a vacant carrier and slot each time communication is performed by each terminal, and when receiving radio interference, moves to another carrier or slot to avoid interference.

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

[0006]

In a mobile communication system, a multiplexed propagation path is formed by reflection / diffraction of a building or the like near a mobile station, so that a received wave may be a composite wave of multiplexed waves having different phases and amplitudes. Many. When the mobile station moves, the phase relationship between the multiplexed waves constituting the received wave changes, so that fading occurs in which the amplitude and phase of the received wave change in a complicated manner. If fading occurs, an interference wave may be demodulated when a desired wave is demodulated.

Conventional interference avoidance method, the receiving side determines that erroneous data by the interference remains and slot toggle communication channels to the transmission side, wishing to make a interference avoidance by frequency switching. However, (a signal for instructing switching of the slots, etc.) signal to the interference has occurred continuously attempts to switch a slot or the like also is likely to be incorrect. In this case, also there is a drawback to be reattempt tension the link again can not be performed slot switching, etc. forever.

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

[0009]

For the purposes achieved SUMMARY OF THE INVENTION, digital radio portable terminal apparatus according to the first aspect of the invention, of the transmitted specific out data, storage means for storing data indicating the interference avoidance, an error detection means for detecting an error of a transmitted manner out data, the first counting the number of times of continuously detecting the error of the data detected by said error detection means
And counting means, and comparing means for comparing the stored interference avoidance instruction <br/> data and the newly transmitted manner was interference avoidance instruction data in the storage means, both the data by the comparing means one
Counts the number of consecutive determinations of data matches determined to match
The second counting means, and the number of consecutive errors detected by the first counting means is equal to or greater than a predetermined value, and
Continuous discrimination of data coincidence counted by the second counting means
And control means for executing a predetermined interference avoidance process when the number of times is equal to or more than a predetermined value .

[0010] According to a second aspect of the invention, of the transmitted specific out data, storage means for storing data indicating the interference avoidance, and error detection means for detecting an error of a transmitted manner out data, the error detection comparison to compare the counting means for counting the number of times of continuously detecting the error of the detected data by means and newly transmitted manner <br/> was interference avoidance instruction data and the stored interference avoidance instruction data in said storage means means the number of times of continuously detecting the errors counted by the counting means is equal to or greater than a predetermined value, and the compared results come with Ru same der by said comparing means, and control means for executing a predetermined interference avoidance process It has.

[0011] The error detection means, for example as described in claim 3, may be one that detects an error by using the added CRC (cyclic redundancy check code) in the transmitted manner out data .

In a preferred embodiment, the interference avoidance is provided.
Instruction data, for example as described in claim 4, it may be a switching instruction data of the slot or frequency.

[0013] The interference avoiding process may be, for example, a process of switching a transmission / reception slot or a transmission / reception frequency.

[0014]

According to the present invention, Rutotomoni error is detected the data was specifically <br/> transmitted by the error detection means, number of times of continuously detecting the error of the data detected by the counting means is counting, or
Interference avoidance instruction data was newly transmitted manner and stored interference avoidance instruction <br/> data in the storage means by the comparison means has are compared. Then, the continuous counting the number of errors counted by the counting means is equal to or higher than a predetermined value, and said comparing means
When the comparison results are the same (or
When the comparison result is repeated a predetermined number of times) , the control means controls to switch the transmission / reception slot or the transmission / reception frequency. Therefore, control such as slot switching and frequency switching ( measures for avoiding interference ) functions more effectively.

[0015]

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

First, the configuration will be described. FIG. 1 is a configuration diagram of a digital cordless telephone device. In FIG. 1, 1
Reference numeral 1 denotes a control unit (counting means, comparing means, control means) for controlling the entire apparatus in accordance with a predetermined protocol, and comprises a CPU and the like. The control unit 11 controls various operations of the digital cordless telephone device, including an interference avoiding process described later, using a RAM 13 that temporarily stores data and calculation results according to a microprogram stored in a ROM 12. The control unit 11 includes a key operation unit 14 provided with numeric keys and various function keys, a display unit 15 such as an LCD for displaying a caller number, time, a call time, a call charge, and the like; A recording / reproducing circuit 16 composed of a cassette tape or an IC memory for transmitting a message and recording a message from the other party, a memory for storing various data including audio data (storage means)
17 are connected.

Further, the digital cordless telephone device includes:
A high frequency section 22 which receives a signal in a transmission / reception radio frequency (RF) frequency band from an antenna 21 or converts a voice signal digitally modulated by a modem 23 into a transmission / reception radio frequency (RF) and emits it from an antenna 27 to the air.
And a modem 23 for digitally demodulating an audio signal received by RF or digitally modulating an audio signal subjected to TDMA processing by the TDMA signal processing unit 24, and time-division of a radio frequency to transmit and receive a transmission / reception signal in a burst at a specific time zone. TDMA (Time Division Multiple Acces) to be transmitted
s: time division multiple access) processing, a TDMA signal processing section 24 for performing a compression / expansion processing of a digital audio signal, a speech codec 25 for converting a digital signal into an analog signal, and outputting the analog signal to a receiver 28 via an amplifier 27. Or a PCM codec 26 for encoding a voice signal input by a transmitter 29 into a PCM digital signal and outputting the same, a receiver 28 such as a speaker, a transmitter 29 such as a microphone, and a ringer unit for ringing. 3
0. The receiver 28 and the transmitter 29 are connected to each other via a grip portion to constitute an integrated handset (handset).

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

The transmitting section 32 converts the π / 4-shifted QPSK modulated wave input from the modem 23 to 1.9 GH with a mixer.
The frequency is converted to z and radiated from the antenna 21 via the antenna switch 34. The PLL synthesizer 33 performs local oscillation for frequency conversion in the receiving unit 31 and the transmitting unit 32. The modem 23 has a π / 4 shift QPSK.
The modulation and demodulation processing is performed on the receiving side.
The IF signal from 1 is demodulated and separated into IQ data, and transmitted to the TDMA signal processing unit 24 as a data string. Also,
On the transmitting side, IQ data is created from the data transmitted from the TDMA signal processing unit 24, and π / 4 shift QPS
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, descrambling or the like is released, the constituent data is taken out from the format of this slot, and the control data is sent to the control unit 11. , Audio data is speech codec 2
5 is transmitted. On the transmitting side, a slot is created by adding control data to the voice data transmitted from the speech codec 25, the slot is inserted into the frame at a predetermined timing by scrambling or the like, and transmitted to the modem 23.

The speech codec 25 performs digital data compression / expansion processing. That is, on the receiving side,
The ADPCM audio signal (4 bits × 8 kHz = 32 kbps) transmitted 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 transmitting side, the PCM audio signal sent from the PCM codec 26 is compressed by encoding it into an ADPCM audio signal and output to the TDMA signal processing unit 24.

The PCM codec 26 performs an analog / digital conversion process. On the receiving side, the analog audio signal obtained by D / A conversion of the PCM audio signal sent from the speech codec 25 is output to the amplifier 27 and the speaker 28 is driven. On the transmission side, the analog audio signal input from the microphone 29 is A / D converted and the PCM audio signal is output to the speech codec 25. Also, it controls volume / ringer / tone signals and the like.

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 a slot created by the TDMA signal processing unit 24. In FIG. 2, the TDMA signal processing unit 24
(Channel type) detection unit 41, UW (sync word) detection unit 42, scramble processing unit 43, CRC (cyclicre
It comprises a dundancy check (cyclic redundancy check code) processing unit 44, a secret talk processing unit 45, audio data buffers 46 and 47, control data buffers 48 and 49, and a timing generation unit 50.

The CI detecting section 41 detects a CI (channel type) from the data string transmitted from the modem 23 and outputs the detected CI to the control section 11. The UW detector 42 detects a UW (synchronization word) from the data string transmitted from the modem 23 and outputs the same to the controller 11. The scramble processing unit 43
This is a process for making the occurrence probabilities of “1” and “0” of data constant, and will be described later in detail with reference to FIGS. CR
The C processing unit (error detection means) 44 includes a CRC for error detection.
(Cyclic redundancy check code). Also, C
An error in the transmitted data is detected by analyzing the RC. This code has a burst error detection capability as well as a random code, and is capable of error correction.

The privacy processing unit 45 is a simple privacy processing for performing scramble processing on TCH information based on data (hereinafter referred to as a security key code) by a key input of a PS or the like.
Details will be described later with reference to FIG. 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 generator 50 performs TDMA in accordance with a control signal from the controller 11.
The timing signal is output to each unit of the signal processing unit 24 and other blocks. In accordance with this timing signal, the slot is taken out / inserted and each component is taken out / inserted.

Here, the slots include a control physical slot and a communication physical slot. The control physical slot is
This is a slot that is used commonly by each user and sets the function channels required for control such as the setting of a physical slot for communication.The physical slot for communication is used exclusively by each user for communication, and individual calls are A slot in which a control channel and an 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) includes a ramp time (R) for transient response,
A start symbol (SS), a preamble (PR) for bit synchronization between a transmission system and a reception system, a synchronization word (UW) for distinguishing a physical slot, a channel type (CI), an individual cell channel SACCH (SA), and data ( I) and a cyclic code (CRC) for error detection.
As shown in FIG. 3, the data transmission format of a digital cordless telephone is a synchronization word (UW), voice data as data (I), and a cyclic code (CR) for error detection.
C), and an error is detected by using a CRC following the audio data.

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

Scrambling Pattern The scrambling pattern is the same for both CS transmission and PS transmission, and the initial value of the scrambling pattern register of the control physical slot is "1111111111". The initial value of the scramble pattern register of the communication physical slot is the lower 9 bits of the ID (CS-ID) to be identified.
Use a pattern with (fixed). Since it is assumed that the additional ID is not used in the private system, there is a possibility that the initial value of the scramble pattern register matches between adjacent CSs, and that intelligible crosstalk occurs. As an example of the 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.

Scrambling Method FIG. 4 is a diagram showing a scrambling execution procedure, and FIG. 5 is a diagram showing a descrambling execution procedure for returning converted data to original serial data. As the PN pattern to be used, the following 16-stage PN pattern is used. PN (16, 12, 3, 1) FIG. 6 shows an example of the configuration of a shift register that generates this PN pattern. In FIG. 6, S0 to S15 indicate shift registers, and “+” indicates Ex-OR. This scrambling process is of a reset type in which a register initial value is set for each frame. Because of the reset type, it is necessary to synchronize between scramble and descramble. However, even if a bit error occurs due to a transmission path, the error does not increase.

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

FIG. 7 is a diagram showing an example of the secret-scramble scrambling process. As described above, a shift register initial value for the scrambling process is generated from the secret key code notified from the PS. The privacy function is applied to the TCH after the security key setting message in the service channel establishment phase is transmitted from the PS to the CS, and this activates the privacy processing.

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

As shown in FIG. 1, voice from a partner station is converted to a baseband signal by an RF section 22 through an antenna 21 and received. The received voice signal is digitally demodulated by a modem 23 and is subjected to a TDMA signal processing section. 2
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 transmitted in a burst is converted to the original transmission speed to extract the audio signal. TDMA signal processing unit 2
The digital audio signal picked up by 4 is expanded by a speech codec 25, converted into an analog audio signal by a PCM codec 26, and emitted from a receiver 28 via an 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 is subjected to TDMA signal processing.
4 is output. The TDMA signal processing unit 24 performs burst transmission control for transmitting signals in a 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 frequency is converted to a radio frequency by the high frequency section 22 and emitted into the air through the antenna 21.

Further, the control unit 11 executes an interference avoiding 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 unit 14, and displays based on the control result. Control such as sending a signal to the display unit 15 and ringing the ringer 30 when receiving an incoming call from the TDMA signal processing unit 24 is performed.

FIG. 8 is a diagram showing a transmission / reception format in the next generation cordless. In the digital cordless telephone device, when the master unit and the slave unit talk, they basically talk using the same frequency. Therefore, as shown in the transmission / reception timing of the normal standby state in FIG. Sometimes, the slave unit is at the reception timing Rx. The transmission and reception between the parent device and the child device are performed at timings as shown in FIG. 8, for example, transmission and reception timing of Tx → Rx is performed from the parent device to the child device, and Tx → R is transmitted from the child device to the parent device.
It is transmitted at the transmission / reception timing of x.

As reception (RX) of the slave unit, error detection is performed by comparing the CRC (cyclic redundancy check code) for error detection sent from the master unit after reception. At this time, if the CRC is incorrect due to interference or the like as shown in FIG.
SACCH (for details, refer to the format of the information channel (TCH) in FIG. 3), DAT
It can be determined that there is an error in either A or CRC. Therefore, the number of times the CRC is erroneous is counted, and if the error is repeated many times, slot switching processing or frequency switching processing is performed for the purpose of avoiding interference. But,
Even if slot switching processing or frequency switching processing is to be performed, the slot and frequency to be transmitted / received next after the instruction data for slot switching etc. are loaded are set to the channel under communication. Irrespective of whether data is exchanged at the slot or frequency where it is considered that there are many CRC errors,
It may be very difficult to recognize where to switch to each other.

On the other hand, the CRC error is indicated by SACCH (16b
it), DATA (160 bit), CRC (16 bi)
In t), if even one bit is wrong, it is detected as an error, so that the data of the SACCH to which the instruction data such as slot switching is transmitted is not always wrong. Accordingly, in this embodiment, several slot switch issues a retransmission request instruction data such as frequency switching, several times the same
If the SACCH data is received, it is determined that there is no error in the SACCH data, and software control is performed so that interference avoidance processing is performed. Here, the same SAC several times
The reason for limiting the case of receiving CH data, if the CRC error was due to an error of the SACCH, if handset
To the slot indicated based on the instruction data received by
In case of transfer, parent device and child device are transferred to different slots
Therefore, it is necessary to disconnect the line and re-establish the link.
This is because that.

That is, it is not considered that the data error due to the interference is only when all the data transmitted in one slot are erroneous, and the slot switching is possible as long as a signal necessary for the slot switching can be received. Focusing on 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 determined as reliable data so that slot switching is performed.

FIG. 10 is a flowchart showing the interference avoidance process, which is executed by the control unit 11. First, receiving the data in step S10, it is determined whether a CRC error in the received data in step S12, the number of CRC errors in step S14 if there is C RC errors counted by the CRC counter, while If there is no CRC error, the CRC counter is reset in step S15.

[0042] Then, stores SACCH data received in step S16, the SACC in step S18
H is received first and compared with the stored SACCH to determine whether the data is the same. If the SACCH is compared and the data is the same, the number of times is determined in step S20 as SA.
Counted by CCH counter, and in step S21 to be identical data by comparing the SACCH SACCH
Reset the counter. As a result, the number of consecutive receptions in which there is no error in the SACCH data is counted.

In step S22, the CRC is incorrect n times,
Also, it is determined whether or not the SACCH comparison data matches m times, and if the CRC is erroneous n times and the SACCH comparison data is m
If the number of times matches, the slot is switched in step S24,
The frequency is switched, and the processing of this flow ends.
That is, in this case, a retransmission request for slot switching and frequency switching is issued many times, and the same data is received many times in response thereto. Therefore, it is determined that there is no error in the SACCH data, and countermeasures for avoiding interference are taken. Do.

As described above, the digital wireless portable terminal device according to the present embodiment includes the control unit 11 and the PCM for converting the voice signal input by the transmitter 29 into a PCM digital signal.
A codec 26, a speech codec 25 for compressing / expanding a digital audio signal, a TDMA signal processing unit 24 for performing a TDMA process for dividing a radio frequency by time and transmitting a transmission / reception signal in a burst in a specific time zone, and a TD
A modem 23 that digitally modulates the audio signal TDMA-processed by the MA signal processing unit 24 and a transmission / reception radio frequency (R)
F), and a high-frequency section 22 that converts the frequency into an air from the antenna 21 and provides a CDMA in the TDMA signal processing section 24.
When the RC processing unit 44 detects that there is an error in the transmitted voice data, the control unit 11 requests retransmission of the data for slot switching several times. Even if it is determined, if the same slot switching signal can be received, this signal is determined as reliable data and slot switching is performed. Therefore, control such as slot switching and frequency switching ( interference avoidance measures) ) Becomes more effective.

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

[0046]

According the present invention, to detect errors in the data was manner is transmitted by the error detection means, with counts the number of times of continuously detecting the error of the data detected by the counting means, stored in the storage means by the comparison means same interference avoidance instruction <br/> compares the data with the newly transmitted manner was interference avoidance instruction data, number of times of continuously detecting the errors counted by the counting means is greater than or equal to a predetermined value, and the comparison result by the comparing means in <br/> Oh Ru and come (or the comparison result given times that is the same
Since the control means controls the transmission / reception slot or the transmission / reception frequency to be switched, that is, a bit is included in a part of the transmitted data.
There is an error, and interference avoidance processing cannot be performed with normal processing
Even if the data with bit error continues several times
During reception, the data in the interference avoidance instruction data
The same data is received twice or a predetermined number of times consecutively.
In that case, the interference avoidance instruction data shall be free of errors.
The transmission / reception slot based on the interference avoidance instruction data.
Or switching the transmission / reception frequency.
Therefore, control such as slot switching and frequency switching
( Interference avoidance measures ) can function more effectively,
The present invention can be applied to a portable digital radio in which the interference situation constantly changes, and an effective effect can be obtained.

[Brief description of the drawings]

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

FIG. 2 is a TD of the digital wireless portable 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 portable terminal device of the embodiment.

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

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

FIG. 6 shows a PN of the digital wireless portable terminal device of the embodiment.
FIG. 3 is a diagram illustrating a configuration example of a shift register that generates a pattern.

FIG. 7 is a diagram showing an example of secret talk scrambling processing of the digital wireless portable terminal device of the embodiment.

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

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

FIG. 10 is a flowchart showing interference avoidance processing of the digital wireless portable terminal device of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Control part (counting means, comparison means, control means) 12 ROM 13 RAM 14 Key operation part 15 Display part 16 Recording / playback circuit 17 Memory (storage means) 21 Antenna 22 High frequency part 23 Modem 24 TDMA signal processing part 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 (synchronous word) detector 43 scramble processor 44 CRC processor (error detector) 45 Secret processing unit 46, 47 Voice data buffer 48, 49 Control data buffer 50 Timing generation unit

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04Q ^7/ 00-7/38 H04B ⁷ /24-7/26

Claims (5)

(57) [Claims] Claims 1.EnemyAvoid interference from data
InstructionsStorage means for storing data to be transmitted,EnemyError detection means for detecting an error in the data
And an error of the data detected by the error detecting means.Continuous
detectionCount the number of timesFirstCounting means; and interference avoidance stored in the storage means.InstructionsData and newly
TransmittedEnemyInterference avoidanceInstructionsdataWhenCompare hands to compare
Steps andThe data determined to be identical by the comparing means
Second counting means for counting the number of consecutive determinations of data match;  SaidFirstOf the error counted by the counting meansContinuous detectionTimes
numberIs greater than or equal to a predetermined value, and
The number of consecutive determinations of counted data match is equal to or greater than a predetermined value.
IfPredetermined interference avoidanceprocessingControl means for executing
And a digital wireless portable terminal device characterized by comprising:
Place. Wherein among the transmitted manner out data, the interference avoidance
Storage means for storing data indicative, and error detection means for detecting an error of a transmitted manner out data, continuous data error detected by said error detection means
Counting means for counting the number of detections, wherein the stored interference avoidance instruction data in the storage means and the newly transmitted manner was interference avoidance instruction data and comparing means for comparing, counted errors in successive detected by said counting means number is equal to or greater than a predetermined value, and the compared sintered <br/> results in recent and Ru identical der by said comparing means, characterized by comprising a control means for executing a predetermined interference avoidance process Digital wireless portable terminal device. Wherein said error detection means, according to claim 1 or claim 2, characterized in that to detect an error with the added CRC (cyclic redundancy check code) in the transmitted manner out data
The digital wireless portable terminal device according to any one of the above. Wherein said interference avoidance instruction data, digital radio portable terminal device according to any one of claims 1 to 3, characterized in that a switching instruction data of the slot or frequency. Wherein said interference avoidance process, a digital wireless portable terminal device according to any one of claims 1 to 4, characterized in that a process of switching transmission and reception slots or receiving frequency.