JPH08242199A - Generating and inspecting system for identification code - Google Patents

Abstract

PURPOSE: To lighten the processing load of a CPU and to attain a small-sized constitution of a circuit in the case where an identification code is transmitted and received. CONSTITUTION: A base station 1 and a mobile station 2 are provided with a register 101 to store beforehand the identification code to show an outgoing identification code and an incoming identification code to constitute control data, an identification code generating part such as a parallel/serial conversion circuit 102, etc., which reads out the identification code of the register at every periodical transmission timing output STM and reception timing output RTM of a timing generating part, and generates it as serial data, and an exclusive logical sum circuit 106, etc., which detects the matching of the output of the identification code generating part and the identification code contained in the received control data at every reception timing output. Consequently, the transmission. reception processing of the CPU is reduced, and besides, the circuit can be shared by transmission and reception, and accordingly, the circuit can be drastically simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital radio telephone apparatus for performing radio communication by time division multiple access between a base station and a plurality of mobile stations, and in particular, generation / inspection of an identification code communicated between the stations. Regarding the scheme.

[0002]

2. Description of the Related Art This type of telephone system adopts a digital system for communication between a mobile station called PS and a base station called CS, and analog signals such as voice signals are AD-converted and DA-converted. It is performed and wirelessly communicated as a digital signal. FIG. 7 shows the configuration of such a telephone device, in which a base station 1 is connected via a subscriber line L, and the base station 1 and four mobile stations 2a to 2d are wirelessly connected.

By the way, a 1.9 GHz band is used as a radio frequency band handled by this type of device, and the carrier frequency interval is 300 KHz. Then, communication can be performed between one base station and four mobile stations via one frequency band, and in this case, this frequency is time-divided into eight time slots ~ in 5 msec as shown in FIG. The base station 1 transmits data to each mobile station in the first four time slots, and receives data from each mobile station in the remaining four time slots. Such TDMA (ti
me division multiple access
Since the same frequency can be used by four mobile stations by the ss) processing, radio waves can be effectively used.

An example of the format of the burst signal communicated between the base station and each mobile station is as shown in FIG. 6, and 240 bits are allocated to each time slot (1 bit = 5/8 x 24
0 = 2.6 μsec), of which 224 data bits
It is a bit and is transmitted by a clock of 384 KHz. Each time slot is roughly divided into a control physical slot for transmitting / receiving control data and a communication physical slot for transmitting / receiving voice data and the like. Here, the control physical slot is a channel for transferring information necessary for call connection.

The control physical slots are, as shown in FIG. 6A, sequentially from the beginning, a transient response ramp time R of 4 bits, a start symbol SS of 2 bits, a preamble PR of 62 bits, and a unique bit of 32 bits. Word UW,
108-bit information I and 16-bit error detection CR
C (Cyclic Redundancy Chec
Each data area of k) is allocated. Here, the information I is information necessary for call connection, and in the case of the uplink from the mobile station to the base station, as shown in FIG. 6B, a 4-bit type signal CI and a 42-bit destination identification It consists of a code, a 28-bit calling identification code, and 34-bit control information I.
Also, in the case of a downlink from the base station to the mobile station side, FIG.
As shown in (c), the type signal CI is followed by a 42-bit originating identification code and a 28-bit destination identification code, which are the same as in the case of the uplink.

Conventionally, the calling identification code and the destination identification code are written in the register by the CPU.
The written identification code is read from the register and transmitted when the burst signal transmission timing comes. Also, the CPU confirms the correctness of each identification code stored in the register each time the burst signal is received, and if the identification code is normal, processes the subsequent control information I as valid.

[0007]

As described above, in the conventional device, when transmitting the identification code, the CPU directly writes in the register. The CPU also directly inspects the received identification code for correctness. Since such an identification code is composed of a large number of bits, if the CPU repeatedly performs such writing of the identification code into the register and inspection of the reception identification code of the register at the time of transmission / reception every 2.5 msec, There is a problem that the load on the CPU increases. In addition, a register and a latch circuit for latching data are required for each of the transmission unit and the reception unit, which causes a problem that the circuit becomes large in scale. Therefore, it is an object of the present invention to reduce the processing load on the CPU when transmitting and receiving the identification code and to make the transmitting and receiving circuit compact.

[0008]

In order to solve such a problem, the present invention provides a transmitting section for transmitting to a base station and a mobile station an identification code indicating a source identification code and a destination identification code which form control data. And a transmitter for storing the identification code in advance, and an identification code generation unit for reading the identification code of the register for each periodic transmission timing output of the timing generation unit and generating it as serial data. . In addition, the base station and the mobile station are provided with a receiving unit for receiving the identification code indicating the originating identification code and the destination identification code that form the control data, and the receiving unit includes a register that stores the identification code in advance and a timing generation unit. Matching detection that detects the match between the identification code generator that reads the identification code of the register at each periodic reception timing output and generates it as serial data, and the identification code included in the output of the identification code generator and the received control data And a section. In addition, the base station and the mobile station have a register for accumulating in advance the identification code indicating the originating identification code and the destination identification code forming the control data, and the register for each periodic transmission timing output and reception timing output of the timing generation unit. An identification code generation unit that reads out the identification code and generates it as serial data, and a match detection unit that detects a match between the output of the identification code generation unit and the identification code included in the received control data for each reception timing output are provided. It is a thing.

[0009]

The identification code previously stored in the register by the control circuit such as the CPU is generated and transmitted based on the periodic transmission timing output of the timing generator. Also,
The identification code previously stored in the register by the CPU or the like is
The generated identification code is compared and collated with the received identification code to inspect the received data while being generated based on the periodic reception timing output of the timing generation unit.
Further, at the time of transmission, the identification code stored in the register in advance is generated and transmitted based on the periodic transmission timing output of the timing generation unit, and at the time of reception, it is generated based on the periodic reception timing of the timing generation unit. The received data is inspected by comparing and collating with the received identification code.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 4 is a block diagram showing an embodiment of a digital radio telephone apparatus to which the present invention is applied, showing an example of a mobile station 2 which performs radio communication with a base station 1. In the figure, the mobile station 2 is wirelessly connected to the base station 1 via a radio unit including an antenna AT, a high frequency unit 21, a modulation / demodulation unit 22, a radio control unit 23, and a radio interface unit 24. Here, the wireless interface unit 24 is connected to the unique word detection unit 25 and the timing generation unit 2 via the timing bus TBS.
6, reception CI check unit 27, scramble unit 28, CRC
Processing unit 29, data receiving unit 30, data transmitting unit 31, transmission data connecting unit 32, simple confidential talk unit 33, speed converting unit 3
4, 35 and the voice processing unit 36 are connected.

In the system bus SBS, the reception CI checking unit 27, the transmission data connecting unit 32, and the speed converting unit 3 described above are also provided.
Each part except 4, 35 is connected, and CPU4
0, the operation unit 41, and the display unit 42 are connected. Further, the voice processing unit 36 is connected with a handset 43 and a ringer 44 required for a telephone call, and each unit as described above operates by power supply from a power supply unit (not shown). Further, the unique word detection unit 25 and the timing generation unit 26 are
384KH extracted by the wireless interface unit 24
It operates based on the clock signal CK of z 2. The data receiving unit 30 and the data transmitting unit 31 are also supplied with the clock signal CK, though not shown. Also, a, b
Shows the reception data and the transmission data when the mobile station 2 communicates with the base station 1, respectively.

The mobile station 2 constructed in this way is the base station 1
When wireless communication is performed with, data is received from the base station 1 through one slot in which one frequency is divided into eight time slots every 5 msec. Then, the data is transmitted to the base station 1 through the slot delayed by four slots from the reception slot. As described above, the time slot is 625μ per slot.
Since 1 sec (5 msec / 8) is allocated and the data for 1 slot is 240 bits, 1
The bit data requires about 2.6 μsec. Therefore, the speed of data transmitted and received is 384KH.
z. Here, each physical slot is roughly divided into a control physical slot for transmitting / receiving control data and a communication physical slot for transmitting / receiving voice data, as already described.
Of these, the control physical slot has a format as shown in FIG.

Next, the operation of the mobile station 2 that transmits data in the above format will be briefly described. In FIG.
When a radio signal near the frequency of 1.9 GHz is transmitted from the base station 1 to the mobile station 2, the antenna AT and the high frequency unit 2
In the wireless unit including the modulation / demodulation unit 22, the wireless control unit 23, and the wireless interface unit 24, a high frequency component is removed from this wireless signal and demodulation is performed to obtain a frequency of 384K.
The reception data a of Hz is output from the wireless interface unit 24.

The received data a is received by the unique word detector 25 and the received CI checker 27, and each unit receives a unique word from the burst-shaped received data a based on each reception timing output of the timing generator 26. A type signal CI indicating the type of received data such as UW and channel type is detected. The detected information is fed back to the timing generation unit 26 and used to generate the timing required for subsequent data reception. The generated timing signal is the timing bus TB
It is output to the transmission / reception processing units such as the scramble unit 28, the data reception unit 30, the data transmission unit 31, the simple confidential talk unit 33, and the voice processing unit 36 via S.

In this case, the scrambler 28 removes the scramble for maintaining the DC balance of the code string applied to the received data a and outputs it to the data receiver 30. C
In the PU 40, after the unique word UW and the type signal CI are detected, the data such as the incoming call identification code, the outgoing call identification code and the information I accumulated in the data receiving unit 30 are input via the system bus SBS, and these If the identification code of No. corresponds to its own device, various protocol processes and received data processes are performed.

As described above, in the mobile station 2, when processing the received data a, the unique word detection unit 25 and the received CI are received.
The inspection unit 27 detects the unique word UW and the type signal CI indicating the received data type, and generates the reception timing of the subsequent data based on these detections. The scramble unit 28, the CRC processing unit 29, the data receiving unit 30, the data The transmission unit 31, the transmission data connection unit 32, the speed conversion units 34, 35, and the like are configured so that the CPU 40 can operate without intervention. When the received data a is the information I of the communication physical slot and indicates a voice signal, the information is deciphered by the simple confidential section 33 and expanded by the speed conversion section 34 into a 32 KHz signal. Further, the voice processing unit 36 converts the analog signal and outputs the analog signal from the handset 43.

Next, when the CPU 40 detects the call operation of the operation unit 41, the CPU 40 creates data after CI based on the above-mentioned format and outputs it to the data transmission unit 31. In the data transmission unit 31, the timing generation unit 26
This transmission data is sent to the CRC processing unit 29 via the data connection unit 32 based on each transmission timing from the. CRC
The processing unit 29 adds an error detection code to this transmission data and sends it to the scramble unit 28. The scramble unit 28 DC-balances this transmission data and sends it as transmission data b to a radio unit such as the radio interface unit 24.

In this way, the calling protocol is executed with the base station 1 to call the partner terminal, and the call is started in response to the partner's response. In this case, the audio signal from the handset 43 has a frequency of 32K in the audio processing unit 36.
Converted into a digital signal of Hz, and the speed conversion unit 35
Compressed to a frequency of 384 KHz by the simple secret section 3
Sent to 3. The simple confidential talk section 33 performs a secret story process on this voice data and sends it to the transmission data connection section 32. After that, this voice data is transmitted to the partner terminal via the base station 1 through the above-mentioned route.

Next, FIG. 5 is a block diagram showing the configuration of the base station 1 wirelessly connected to the mobile station 2. In the figure,
The same parts as those of the mobile station 2 are designated by the same reference numerals, and detailed description thereof will be omitted. That is, the base station 1 omits the operation unit 41, the display unit 42, the handset 43, and the ringer 44 provided in the mobile station 2, and the voice processing unit 36 is connected to the line interface 5.
1 is connected.

In this case, the CPU 50 has the data receiving unit 3
When calling data (control data) or the like is input from the mobile station 2 via 0, the line interface 51 is controlled to send a dial signal or the like corresponding to the calling data to the line L. When an incoming signal from the line L is received via the line interface 51, incoming data (control data)
Is set in the data transmission unit 31 and transmitted to the mobile station 2 side. The transmission of voice signals other than control data such as calling data and incoming data is performed in the same manner as in the mobile station 2. That is, the voice signal on the line L side via the line interface 51 is processed by the voice processing unit 36, subjected to speed conversion and scramble processing, and then transmitted to the mobile station 2 side via the radio unit. Further, the voice signal from the mobile station 2 is received by the radio section, then scrambled and speed-converted, further voice-processed, and then transmitted to the line L side.

By the way, in the base station 1 and the mobile station 2, when transmitting / receiving the control data such as the above-mentioned outgoing call data and incoming data, as already described in detail, the control physical slot shown in FIG. 6 is used. The control data is transmitted and received as information I shown in FIGS. 6B and 6C. Further, the synchronization burst for establishing synchronization between the base station 1 and the mobile station 2 is transmitted in the formats shown in FIGS. 6 (d) and 6 (e). In the past, the CPU directly writes the outgoing call identification code and the incoming call identification code in the data through the control physical slot to the data transmission unit 31 each time the transmission is performed. Further, when these identification codes are received, the CPU directly inspects the identification codes accumulated in the data receiving section 30 to confirm the correctness.

Therefore, there is a problem that the processing load of the CPU increases. Further, each of the data transmitting unit 31 and the data receiving unit 30 requires a register, a latch circuit for latching data, and the like, which causes a problem that the circuit becomes large-scale. Therefore, in this embodiment, when transmitting and receiving the identification code, the data transmitting unit 31 and the data receiving unit 3
0 is shared to reduce the circuit scale and reduce the processing load on the CPU.

FIG. 1 shows an identification code transmission circuit of the data transmission unit 31 and a data reception unit 30 in the base station and each mobile station.
3 is a block diagram of an identification code transmission / reception circuit that is shared with the identification code reception circuit of FIG. In the figure, this identification code transmission / reception circuit includes a register 101, a parallel / serial conversion circuit 102, an inverter 103, and an OR (logical sum) circuit 10.
4, AND (logical product) circuit 105, exclusive OR circuit 1
06, flip-flop (F / F) circuits 107 and 108
Consists of

In FIG. 1, DATA is CP.
U (CPU 40 for mobile stations, CPU for base stations
Identification code data indicating the originating identification code and the destination identification code consisting of 70 bits given by
, Is the identification code data transmitted from this circuit, CS is the chip select signal, CK is the clock signal of 384 KHz, STM is the transmission timing signal output from the timing generation unit 26, and RTM is the timing generation unit 26 similarly.
From the timing generator 26, RTM is a signal indicating the transmission range timing (transmission time) of the identification code, a1 is the descrambled reception data, and CLR is the CPU output. Clear signal.

FIG. 2 is a timing chart showing the transmission operation of this identification code transmission / reception circuit. 1 and 2
The transmission operation of this identification code transmission / reception circuit will be described with reference to FIG. First, the CPU sends the 70-bit identification code data DATA to the chip select signal C in the initialization processing or the like.
The parallel data is set in the register 101 by S. Here, in the case of a mobile station, as shown in FIG. 6B, a 42-bit incoming identification code and a 28-bit outgoing identification code are set. In the case of a base station, as shown in FIG. 6C, a 42-bit calling identification code and a 28-bit destination identification code are set.

The identification code data thus set in the register 101 is converted into a serial signal by the parallel / serial conversion circuit 102. That is, the transmission timing signal STM shown in FIG.
Is output to the parallel / serial conversion circuit 102 via the OR circuit 104, the parallel / serial conversion circuit 1
Reference numeral 02 loads the identification code data set in the register 101 in synchronization with the clock signal CK shown in FIG. And
The serial-converted identification code data is synchronized with the clock signal CK shown in FIG.
Is output to one input of the AND circuit 105.

On the other hand, to the other input of the AND circuit 105, the transmission range timing STR of this identification code shown in FIG. 2C is output from the timing generation section 26,
In the AND circuit 105, this transmission range timing STR
Of the identification code data DATA during the "H" level in FIG.
Output as DATA shown in (d). After that, when the next transmission timing signal STM is output from the timing generation unit 26, the identification code data set in the register 101 is similarly output from the AND circuit 105 as the identification code data DATA. In this way, when transmitting the identification code, the identification code can be repeatedly transmitted without the CPU setting the identification code data in the register 101 each time, so that the load of the identification code transmission processing of the CPU can be significantly reduced.

Next, the receiving operation of the identification code transmitting / receiving circuit will be described with reference to the timing chart of FIG. When the reception timing signal RTM shown in FIG. 3B is output from the timing generation unit 26 to the parallel / serial conversion circuit 102 via the OR circuit 104, the parallel / serial conversion circuit 102 registers in the initialization processing of the CPU. The identification code data set in 101 is loaded in synchronization with the clock signal CK shown in FIG. The serial-converted identification code data is the identification code data DATA shown in FIG.
Is output to one input of the exclusive OR circuit 106.

At this time, the exclusive OR circuit 106
To the other input of the received data a1 as shown in FIG.
Is transmitted, the exclusive OR circuit 106 takes the exclusive OR of the received data a1 and the identification code data DATA from the register 101 and outputs the output result O
The UT is output to the F / F circuit 107. By the way, the identification code data transmitted from the own station to the partner station and the identification code data transmitted from the partner station to the own station usually match.

Here, if both the identification code data match, the output signal OUT of the exclusive OR circuit 106 holds the "L" level, but if both data do not match, FIG. As shown in (e), the level becomes "H". In this case, the F / F circuit 107 is the inverter 103.
"H" level output signal OUT from the exclusive OR circuit 106 in synchronization with the inverted output of the clock signal CK via
Latch. Then, this "H" level output signal OU
The T is output to the F / F circuit 108 as a clock signal.
In this case, the F / F circuit 108 outputs the "H" level error signal ERR as shown in FIG. 3 (f) to the CPU side. As a result, the CPU can recognize the reception error of the identification code only by detecting the error signal ERR. Therefore, compared with the conventional method in which the contents of the register are inspected one by one to detect the reception error of the identification code. The reception processing load on the CPU can be greatly reduced. When the error signal is detected, the CPU sends the clear signal CLR to each F / F circuit 1
07 and 108 are output to reset the clear signal CLR.

Further, the reception error ERR of this identification code and another error such as CRC check result error may be given to the CPU as an OR condition. In this case, CP
U is configured to treat as a burst receive error if any error is detected. With this configuration, it is possible to simplify the error processing of the CPU, which conventionally performs detection and processing for each error during burst reception. In the circuit of the present embodiment, unlike the conventional circuit, each register and each parallel / serial conversion circuit for transmitting and receiving the identification code are not provided, and as shown in FIG. Since the identification code can be transmitted and received by the serial conversion circuit, the circuit can be greatly simplified.

[0032]

As described above, according to the present invention, C
Since the identification code is accumulated in the register in advance by the PU or the like, and the identification code generation unit is configured to generate and transmit the accumulated identification code based on the periodic transmission timing output from the timing generation unit, the CPU transmits the identification code. In this case, it is not necessary to transmit the burst signal each time it is transmitted, and therefore the processing load on the CPU when transmitting the identification code can be greatly reduced. Further, the CPU or the like stores the identification code in advance in the register, the identification code generation unit generates the accumulated identification code based on the periodic reception timing output of the timing generation unit, and the coincidence detection unit generates the generated identification code. Since the received data is inspected by comparing and collating with the received identification code, the CPU can judge whether the received identification code is correct by inputting only the inspection result.
The processing at the time of receiving the U identification code can be greatly reduced. Also,
At the time of transmission, the identification code stored in the register in advance is generated and transmitted based on the periodic transmission timing output of the timing generation unit, and at the time of reception, the identification of the register is performed based on the periodic reception timing of the timing generation unit. Since the code is generated and the received data is inspected by comparing and collating with the received identification code, the CPU's identification code transmission / reception processing is greatly reduced and the parallel / serial conversion that constitutes the register and the identification code generation unit is performed. The circuit can be used for both transmission and reception, so that the circuit can be constructed in a small scale.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an identification code transmission / reception circuit to which the present invention is applied.

FIG. 2 is a timing chart showing a transmission operation timing of the circuit of the embodiment.

FIG. 3 is a timing chart showing a receiving operation timing of the embodiment circuit.

FIG. 4 is a block diagram showing a configuration of a mobile station to which an embodiment circuit is applied.

FIG. 5 is a block diagram showing a configuration of a base station to which the embodiment circuit is applied.

FIG. 6 is a diagram showing an example of control data transmitted and received in a control physical slot in a digital wireless telephone device.

FIG. 7 is a system configuration diagram of a digital wireless telephone device.

FIG. 8 is a diagram showing communication timing of the digital wireless telephone device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Base station, 2a-2b ... Mobile station, 26 ... Timing generation part, 30 ... Data receiving part, 31 ... Data transmitting part, 10
1 ... register, 102 ... parallel / serial conversion circuit,
103 ... Inverter, 104 ... OR circuit, 105 ... AND circuit, 106 ... Exclusive OR circuit, 107, 108 ...
F / F circuit.

Claims (3)

[Claims] 1. A base station accommodating a wired line and performing wireless communication by time division multiple access through a plurality of transmission and reception time slots, and each of the plurality of transmission and reception wirelessly connected to the base station. Of the time slots, the mobile station performs radio communication with the base station via any one of the transmission time slot and the reception time slot, and when transmitting / receiving control data, the transmission / reception time slot is used as a control physical slot, In a digital radiotelephone device that transmits and receives the control data based on a clock signal of a predetermined frequency and an output of a timing generation unit that generates each timing signal of periodic transmission and reception from this clock signal, in the base station and the mobile station, A transmitter is provided for transmitting an identification code indicating a calling identification code and a destination identification code that form the control data. The transmission unit, a register for previously storing said identification code, the identification code generator for generating a serial data read an identification code of the register in periodic transmission timing for each output of the timing generator is provided, C
An identification code generation / inspection method characterized in that an identification code accumulated in advance in the register is generated and transmitted based on a periodic output of the timing generation unit by a control circuit such as a PU. 2. A base station that accommodates a wired line and performs wireless communication by time division multiple access through a plurality of transmission and reception time slots; and each of the plurality of transmissions and receptions wirelessly connected to the base station. Of the time slots, the mobile station performs radio communication with the base station via any one of the transmission time slot and the reception time slot, and when transmitting / receiving control data, the transmission / reception time slot is used as a control physical slot, In a digital radiotelephone device that transmits and receives the control data based on a clock signal of a predetermined frequency and an output of a timing generation unit that generates each timing signal of periodic transmission and reception from this clock signal, in the base station and the mobile station, A receiving unit is provided for receiving an identification code indicating a calling identification code and a destination identification code forming the control data. A register that stores the identification code in advance in the reception unit, an identification code generation unit that reads out the identification code of the register for each periodic reception timing output of the timing generation unit, and generates the serial data, and an identification code generation unit. Generation of an identification code, characterized in that a coincidence detection section for detecting a coincidence between the output and the identification code included in the received control data is provided, and the identification code is inspected according to the output of the coincidence detection section.・ Inspection method. 3. A base station accommodating a wired line and performing wireless communication by time division multiple access through a plurality of transmission and reception time slots, and each of the plurality of transmission and reception wirelessly connected to the base station. Of the time slots, the mobile station performs radio communication with the base station via any one of the transmission time slot and the reception time slot, and when transmitting / receiving control data, the transmission / reception time slot is used as a control physical slot, In a digital radiotelephone device that transmits and receives the control data based on a clock signal of a predetermined frequency and an output of a timing generation unit that generates each timing signal of periodic transmission and reception from this clock signal, in the base station and the mobile station, A register for accumulating in advance an identification code indicating an originating identification code and a destination identification code which constitute the control data; An identification code generation unit that reads out the identification code of the register for each periodic transmission timing output and reception timing output of the timing generation unit and generates as serial data, and an output of the identification code generation unit for each reception timing output are received. A match detection unit that detects a match with the identification code included in the control data is provided, and at the time of transmission, the identification code of the identification code generation unit generated based on the periodic transmission timing output of the timing generation unit is used. An identification code generation / inspection method, characterized in that the identification code is inspected according to the output of the coincidence detection unit while being transmitted.