JPH09261202A - Frequency hopping communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To flexibly generate a frequency hopping pattern with simple configuration by providing a storage element storing number information corresponding to a frequency used at every time unit and writing the number information by means of CPU. SOLUTION: A frequency hopping system for shifting the frequency used at ever fixed period is used in a frequency hopping communication system. In the system, frequency registers 821-840 store the frequency numbers corresonding to basic frame number fields (BF) 1-20. A data bus 841 is connected to the data bus of CPU with CPU i/f, an address bus 842 and a BF number register 843 storing BF numbers at respective time points are selectively connected to an address decoding part 845 and the address decoding part 845 decides to which one of the registers 821-840 access is performed. When CPU sets the frequency, frequency number data is written in the I/O addresses of the respective registers 821-840.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication network using radio by frequency hopping, and more particularly to a method of setting and using a frequency hopping pattern.

[0002]

2. Description of the Related Art In recent years, wireless communication has rapidly progressed and has been used in various fields. A telephone exchange device (including a key telephone device) is no exception, and a system for wirelessly communicating between a main device having an exchange function and a wireless telephone has been put to practical use.

In particular, digital wireless communication systems are being put to practical use, and spread spectrum communication is receiving particular attention. Spread spectrum communication is known to have high interference removal capability and excellent confidentiality by spreading transmitted information over a wide band. In countries around the world,
The frequency of 2.4 GHz band is allocated for spread spectrum communication, and it is about to be spread all over the world.

The spread spectrum communication systems are roughly classified into frequency hopping (FH system) and direct spread (DS system). The former is to perform transmission using a wide band by changing the modulation frequency within a fixed time, and the latter is to spread-modulate the information to be transmitted with a pseudo-noise code at a speed that is ten to several hundred times that speed. It uses a wider band.

Of these, the system using the frequency hopping method has an advantage that the circuit configuration is relatively simple. An important point in a system using this frequency hopping method is a method of generating and setting a hopping pattern which is frequency switching information.

The simplest method for generating such a frequency hopping pattern is to write all hopping patterns that may be used in a ROM in advance (first conventional example). Also,
As another method, a method of generating a hopping pattern by a specific arithmetic expression (second conventional example) has been proposed.

[0007]

However, as in the first conventional example, all hopping patterns are stored in the ROM.
However, there is a problem that the capacity of the ROM becomes large and the cost becomes high. Further, as in the second conventional example, the method of generating a hopping pattern by an arithmetic expression has a problem that it is difficult to deal with a case where a specific frequency cannot be used.

It is an object of the present invention to provide a frequency hopping communication system capable of flexibly generating a frequency hopping pattern with a simple structure.

[0009]

Means for Solving the Problems The first invention of the present application is:
In a frequency hopping communication system using a frequency hopping system that switches a frequency to be used for each fixed cycle, a storage unit including a storage element such as a memory or a register for storing number information corresponding to a frequency to be used for each time unit, By having a control means such as a CPU for writing the number information corresponding to the frequency in the storage means, C
A hopping pattern determined by the PU or the like according to the radio wave condition can be used.

In the second invention of the present application, the storage means is composed of registers having different addresses for each time unit, so that the frequency can be set for each time unit.

In the third invention of the present application, since the control means writes the frequency number information for each time unit in the storage means, it is possible to set only the frequency in the time unit which the CPU or the like determines to be set. It was done like this.

A fourth invention of the present application is a means for assembling data to be transmitted into a frame, a means for reading the number information from a storage means for storing number information corresponding to a frequency in synchronization with a frame transmission timing, and a means for reading the number information. By including means for controlling the frequency synthesizer of the wireless transmission unit based on the read number information, it is possible to transmit the frame based on the hopping pattern set by the CPU or the like.

In the fifth invention of the present application, the wireless system is configured by a centralized control station having means for determining a hopping pattern and a wireless terminal receiving the hopping pattern information determined by the centralized control station. It is possible to prevent occurrence of frequency collision between wireless terminals.

According to a sixth aspect of the present application, the hopping pattern information includes information associating each time unit with a frequency number so that the wireless terminal can obtain information necessary for setting the hopping pattern. It is a thing.

In the seventh invention of the present application, the control circuit in the wireless terminal which has received the hopping pattern information writes the frequency number information for each time unit in a predetermined storage means, whereby the wireless terminal is Enabled to operate according to the hopping pattern optimized by the system.

In the eighth invention of the present application, all wireless terminals and the centralized control station switch frequencies at the same timing, thereby preventing the occurrence of mutual interference.

According to a ninth aspect of the present application, the centralized control station and / or the wireless terminal has storage means for storing the second hopping pattern, and when performing communication between the wireless terminals,
By having the means for switching the frequency according to the second hopping pattern, while transmitting / receiving the control information with the main device by the first hopping pattern, the peer-to-peer data transmission / reception between the wireless terminals is performed. It enables you to do.

According to the tenth invention of the present application, the storage means is housed inside the channel codec for assembling / disassembling the frame, so that the apparatus can be made compact.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 is an explanatory diagram showing the configuration of a system assumed in this embodiment.

This system accommodates the public line 102,
An exchange 101 having an exchange function and a wireless connection function;
A plurality of wireless telephones 103-A and 103 for communicating control data and voice data with the exchange 101.
-B and a data terminal device 104-A which performs control data communication between the exchange and direct data communication between terminals.
˜104-F.

The definition of the data terminal device in the present embodiment is that "a terminal (data terminal) having a function of transmitting an arbitrary amount of data in a burst and a radio that controls wireless communication between the data terminal and the main device. Combined with adapter "
And the data terminal is a computer 104-A.
Not only printer 104-B, copier 104-C, video conference terminal 104-D, facsimile 104-E, L
The AN bridge 104-F and various terminals such as electronic cameras, video cameras, and scanners that perform data processing are applicable.

These wireless dedicated telephones and data terminals are
A major feature of the present system is that communication between each terminal can be freely performed, and at the same time, a public network can be accessed. Hereinafter, the detailed configuration and operation will be described. (Configuration of Main Device) First, the configuration of a main device that accommodates a public line will be described.

FIG. 2 is a block diagram showing the configurations of the system and the main unit of this embodiment.

The main unit 1 is a main part of the present switching system, accommodates a plurality of outside lines and a plurality of terminals, and exchanges calls between them. The connection device 2 performs control of the wireless terminal wirelessly under the control of the main device 1 so that a wireless terminal (a wireless dedicated telephone, a data terminal to which a wireless adapter is connected) can be accommodated in the system. The transmission path is established.

The wireless-only telephone 3 is a telephone for making a call with an external line accommodated in the main device via the connection device 2 and for making an extension call with each other. The wireless adapter 4 includes a data terminal 5 such as a computer and a printer, and SL.
By connecting to a T (single telephone) 10, a facsimile 11 and an ISDN terminal 12, wireless data transmission is possible between similarly configured data terminals.

The PSTN (existing public network) 6 is one of the external networks accommodated in the main unit 1, and the PSTN line 7 is a PS.
It is an outside line from TN6. ISDN (Digital Communication Network)
Reference numeral 8 denotes one of the external networks accommodated in the main
N line 9 is an outside line from ISDN 8. The SLT (single telephone) 10 is one of the terminals housed in the main device 1.

The internal configuration of the main unit 1 will be described below. First, the CPU 201 is the center of the main device 1 and controls the entire main device including exchange control. The CPU 201 allocates a control channel and manages an empty control channel in response to a control channel allocation request from a terminal coming from the connection device i / f 210, and temporarily stores the information in the RAM 203.

The ROM 202 stores the control program of the CPU 201, and the RAM 203 stores the CP.
It stores various data for controlling U201 and provides a work area for various calculations.

The call path unit 204 controls the exchange of calls (time division exchange) under the control of the CPU 201.
Under the control of the CPU 201, the N-line i / f 205
This interface performs PSTN line control such as incoming call detection, selection signal transmission, and DC loop connection for accommodating a TN line. The ISDN line i / f 206 is a CPU 201
This interface supports ISDN layers 1 and 2 for accommodating an ISDN line under the control of, and performs ISDN line control.

Under control of the CPU 201, the SLTi / f 207 is an interface that performs power supply to allow the SLT 10 to be accommodated, loop detection, selection signal reception, call signal transmission, and the like. The wireless telephone section 208 is a handset,
It has a dial key, a call circuit, a display, etc.
Under the control of the PU 201, it functions as an extension wireless telephone, and functions as an SLT at the time of power failure.

The tone sending circuit 209 sends out various tones such as a PB signal, a dial tone and a ring tone. The connection device i / f 210 is an interface that transmits and receives a call signal and a control signal to and from the connection device 2 to accommodate the connection device 2 under the control of the CPU 201. (Structure of connection device)
FIG. 3 is a block diagram showing the configuration of the connection device 2.

The CPU 301 is the center of the connection unit 2 and controls the entire connection unit 2 including the control of the communication channel and the radio section. The ROM 302 is the CPU 3
01 is stored, and EEP
The ROM 303 stores a call code (system ID) of the switching system. RAM 304 is a CPU
While storing various data for control of 301,
It provides a work area for various calculations.

The main unit i / f 305 is an interface for transmitting / receiving a call signal and a control signal to / from the connection unit i / f of the main unit 1 under the control of the CPU 301. PCM / ADPC
Under the control of the CPU 301, the M conversion unit 306 controls the main device 1
The PCM-encoded call signal from the AD converter is converted into an ADPCM code and transmitted to a channel codec 307, which will be described later, and the ADPCM-encoded call signal from the channel codec 307 is converted into a PCM code, and the main device 1
To send to.

The channel codec 307 is the CPU 30.
Under the control of 1, the ADPCM-coded speech signal and the control signal are subjected to processing such as scrambling, and are also time-division multiplexed into a predetermined frame. Radio unit 3
08, under the control of the CPU 301, modulates the framed digital signal from the channel codec 307 so that it can be transmitted wirelessly, transmits it to the antenna, and demodulates the signal received wirelessly from the antenna. The digital signal is processed into a framed digital signal. FIG. 4 is a block diagram showing the configuration of the wireless telephone 3.

The CPU 401 is the center of the wireless-only telephone 3, and includes the wireless-only telephone 3 including the radio section control and call control.
The ROM 402 controls the entire system.
The control program 401 is stored.

The EEPROM 403 is a calling code (system ID) of this exchange system, and a sub ID of the wireless telephone.
Is stored in the RAM 404.
In addition to storing various data for the control of the above, a work area is provided for various calculations.

Under the control of the CPU 401, the call circuit 405 inputs / outputs a call signal from a handset 410, a microphone 411, and a speaker 412, which will be described later.

The ADPCM codec 406 is the CPU 4
Under the control of C.01, the analog voice signal from the communication circuit 405 is converted into an ADPCM code, and transmitted to a channel codec 407 described later.
7 converts the ADPCM-encoded call signal into an analog voice signal and transmits it to the call circuit.

The channel codec 407 is a CPU 40.
Under the control of No. 1, processing such as scrambling is performed on the communication signal and the control signal that have been ADPCM-coded, and time-division multiplexing is performed on a predetermined frame.

Under the control of the CPU 401, the radio section 408 modulates the framed digital signal from the channel codec 407, processes it so that it can be transmitted by radio, and transmits it to the antenna described later. The received signal is demodulated and processed into a framed digital signal.

The handset 410 is for inputting / outputting a voice signal for talking, and the microphone 411 is for collecting and inputting a voice signal. The speaker 412 outputs a voice signal in a loud voice, and the display unit 413 displays a dial number input from a key matrix to be described later and an external line usage status.

The key matrix 414 is composed of dial keys for inputting dial numbers and the like, and function keys such as an outside line key, a hold key, and a speaker key. (Configuration of Wireless Adapter) FIG. 5 is a block diagram showing the configuration of a wireless adapter 502 connected to a data terminal 501 that can be accommodated in the system.

In the figure, a data terminal 501 represents, for example, a personal computer, a workstation, a printer, a facsimile, or other data terminal equipment connected to the wireless adapter 502 via a communication cable or an internal bus.

The wireless unit 503 of the wireless adapter 502 exchanges wireless signals with the wireless unit of the connection device or another wireless adapter.

The main control unit 504 is a CP that is the center of control.
U, a peripheral device for performing interrupt control, DMA control, and the like, an oscillator for a system clock, and the like, and controls each block in the wireless adapter.

The memory 505 is composed of a ROM for storing programs used by the main controller 504, a RAM used as a buffer area for various processes, and the like.

The communication i / f section 506 is a communication i / f that is standardly equipped with a data terminal device such as the data terminal 501 described above, for example, RS232C, Centronics, LA.
Communication i / f such as N, internal bus of personal computer or workstation, for example, ISA bus, PCM
CIAi / f and the like correspond.

The terminal control unit 507 controls various kinds of communication necessary for data communication between the data terminal 501 and the wireless adapter 502 via the communication i / f 506.

The channel codec 508 performs frame processing and radio control, and its configuration is shown in FIG. The data assembled into a frame by the channel codec 508 is transmitted to the main device or the opposite terminal via the wireless unit.

The error correction processing unit 509 is used to reduce bit errors occurring in data by wireless communication. At the time of transmission, an error correction code is inserted in the communication data. Further, at the time of reception, an error position and an error pattern are calculated by arithmetic processing, and a bit error in the received data is corrected.

The timer 510 provides a timing signal used by each block inside the wireless adapter.

FIG. 6 is a block diagram showing the configuration of a built-in modem type wireless adapter which is required when performing data transmission to a public line.

This wireless adapter 502 is provided with a modem 511 and an ADPCM codec 512 instead of the error correction processing unit 509 in the configuration of FIG.

The modem 511 modulates data into a voice band signal, and the ADPCM codec 5
Reference numeral 12 is for encoding the signal modulated by the modem 511. As a result, the ADPCM encoded data is assembled into a frame by the channel codec 508 and transmitted to the main device via the wireless unit 503. (Structure of Radio Unit) FIG. 7 is a block diagram showing a radio unit having a common configuration for the main unit, wireless dedicated telephone and data terminal of the present system.

The transmitting / receiving antennas 601a and 601b are
The switch 602 is for efficiently transmitting and receiving a radio signal, and the changeover switch 602 is for changing over the antennas 601a and 601b. A band pass filter (hereinafter, referred to as a BPF) 603 is for removing signals in unnecessary bands, and a changeover switch 604 is for switching between transmission and reception.

The amplifier 605 is a receiving amplifier.
The amplifier 606 is a transmission-system power control amplifier. The converter 607 includes the 1st. It is a down converter for IF, and converter 608 is an up converter.

The change-over switch 609 is for switching between transmission and reception, and the BPF 610 is for removing a signal in an unnecessary band from the signal converted by the down converter 607. Converter 611 is
2nd. This is a down converter for the IF, and the two down converters 607 and 611 constitute a double-version receiving mode.

The BPF 612 is 2nd. For IF,
The 90-degree phase shifter 613 shifts the output phase of the BPF 612 by 90
It is a phase shift. Quadrature detector 614 is
The BPF 612 detects and demodulates a signal received by the 90-degree phase shifter 613. Further, the comparator 615 is for waveform shaping the output of the quadrature detector 614.

Further, a voltage controlled oscillator (hereinafter referred to as VCO) 616 and a low pass filter (hereinafter referred to as LPF)
617 and a PLL 618 including a programmable counter, a prescaler, a phase comparator, and the like.
And form a frequency synthesizer for the receiving system.

Further, a VCO 619 for generating a carrier signal
, An LPF 620, a PLL 62 including a programmable counter, a prescaler, a phase comparator, and the like.
1 and 1 constitute a frequency synthesizer for hopping.

Further, the VCO 6 of the transmission system having the modulation function
22, a LPF 623, a PLL including a programmable counter, a prescaler, a phase comparator, and the like.
624 constitutes a transmission frequency synthesizer having a frequency modulation function.

The reference clock oscillator 625 is a PLL of various types.
The baseband filter 626 supplies a reference clock for 618, 621, and 624, and the baseband filter 626 is a filter for band limitation of transmission data (baseband signal).

The operation of the above radio section will be described below. 1. At the time of transmission, data (digital data) input from an external circuit such as a processor is band-limited by a baseband filter 626, and then input to a modulation terminal of a transmission system VCO 622.

The transmission system VCO 622 is the transmission system PLL 62.
4 and a control voltage output from the LPF 623 circuit to determine the frequency, and generate an intermediate frequency (IF) modulated wave by direct modulation.

VCO 622, LPF 623, PLL 62
4 generated by the frequency synthesizer (I
The modulated wave of F) is input to the up-converter 608,
VCO619, LPF620, PLL62 for hopping
After being added to the carrier signal generated by the frequency synthesizer composed of 1, it is input to the transmission system amplifier 606.

The signal amplified by the transmission system amplifier 606 to a predetermined level has its unnecessary band signal removed by the BPF 603, and then emitted from the antenna 601 as a radio wave into space. 2. At reception The signal received by the antenna 601 is the BPF 603.
After removing unnecessary band signals, the signal is amplified to a predetermined level by a receiving amplifier 605.

The carrier signal of the received signal amplified to a predetermined level is removed by the down converter 607,
1st. Converted to IF frequency.

1st. The received signal of IF is BPF610
After the signal in the unnecessary band is removed by 2nd. The signal is input to the down converter 611 for IF.

The down converter 611 is a VCO 61.
6, a signal generated by a frequency synthesizer composed of an LPF 617 and a receiving system PLL 618, and 1st. I
F. 2nd. A signal having an IF frequency is generated.

2nd. The reception signal down-converted to the IF frequency is input to a 90-degree phase shifter 613 and a quadrature detector 614 after an unnecessary band signal is removed by a BPF 612.

The quadrature detector 614 performs detection and demodulation using the signal whose phase has been shifted by the 90-degree phase shifter 613 and the original signal.

The data (analog data) demodulated by the quadrature detector 614 is waveform-shaped by the comparator 615 as digital data and output to an external circuit. (Wireless Frame) FIGS. 8 and 9 show a wireless frame configuration used in this system.

In this system, a "communication frame between main device and wireless dedicated telephone" (hereinafter referred to as PCF),
Three different frames, “communication frame between wireless telephones” (hereinafter, referred to as PPF) and “burst data frame” (hereinafter, referred to as BDF) are used. PCF and PPF
Is a circuit-switched channel and is used when communicating data with strong real-time characteristics such as voice and video. BD
F is a packet switching channel, which is used when performing peer-to-peer data communication between data terminals. Hereinafter, the details of the internal data of each frame will be described.

FIG. 8 (1) shows the PCF. In the figure, CNT-T is a control field having a frame synchronization signal, a logical control channel, etc., and T1 to T4 are 4
It is an audio channel sent to different wireless telephones.
Further, R1 to R4 are voice channels sent from four different wireless dedicated telephones, and CNT-R is a control field containing logical control information sent from the wireless terminal to the main device. Further, CF is the frequency switching time.

Further, in FIG. 8 (1), F1, F
“3” indicates a frequency channel used when wirelessly transmitting this frame, and indicates that the frequency is changed for each frame.

FIG. 8B shows the PPF. In the figure, CNT-T is a control field having a frame synchronization signal, a logical control channel, etc., and T1 to T3 and R1 to R3 are call channel fields used for a call between three different wireless dedicated telephones. . Also, CNT-
R is a control field containing logical control information sent from the wireless terminal to the main device. Further, CF is the frequency switching time.

Further, in FIG. 8 (2), F1, F
3, F5 and F7 are frequency channels used for wirelessly transmitting this frame. Unlike the PCF, after receiving the logical control information LCCH-T from the main unit in F1, the frequency channel is changed to Switch to F5 secured for wireless dedicated telephone communication to perform wireless dedicated telephone communication.

After that, the procedure of switching the frequency channel to F3, receiving the logical control information from the main unit, and switching the frequency channel to F7 secured for the communication between the wireless dedicated telephones is repeated until the communication between the wireless dedicated telephones is completed. Is shown.

FIG. 8C shows the BDF. In the figure, CNT-T is a control field having a frame synchronization signal, a logical control channel, etc., and CS is a carrier sense period for performing contention control between terminals. R is a ramp period and PR is a preamble sending field. UW is a unique word for byte synchronization, and DATA is a data field. Further, CF is the frequency switching time.

Further, in FIG. 8 (3), F1, F
3, F5 and F7 are frequency channels used for wirelessly transmitting this frame. Unlike the PCF, after receiving logical control information from the main unit in F1,
F5 secured frequency channel for burst data communication
Then, the wireless data terminals communicate with each other.

After that, the procedure of switching the frequency channel to F3, receiving the logical control information from the main unit, and switching the frequency channel to F7 secured for burst data communication is repeated until the burst data communication ends.

FIG. 9A shows the structure of the CNT-T field. In the figure, CS is a carrier sense field, R is a ramp time, PR0 is a 62-bit preamble for capturing bit synchronization, SYN is a 32-bit frame synchronization signal, ID is a 64-bit calling signal, and U is a U-signal.
W is a unique word, BF is a basic frame number field, MF is a multiframe number field, LCCHT.
Is the logical control information, CRC sent from the main unit to the wireless terminal.
Indicates CRC information in the CNT-T field. The numbers in the figure indicate the number of bits in this embodiment. Also,
The synchronization control connection device 3 receives a frame synchronization signal SYN received from another system and generates a synchronization pulse.

FIG. 9B shows the structure of the voice channel. Since the configurations of T1 to T4 and R1 to R4 are common, the transmission voice channels are collectively referred to as Tn, and the reception voice channels are collectively referred to as Rn. The configurations of Tn and Rn are also common.

In FIG. 9B, PR1 is a preamble for each slot, UW is a unique word, and B is 32 kb.
B channel information of ps, CRC is CR for voice channel
C information, GT represents guard time, and RV represents reserve.

FIG. 9C shows the logical control channel CNT-.
The frame structure of R is shown. LCCHR is logical control information sent from the wireless terminal to the main device. (Channel codec) The frame is processed by the channel codec. FIG. 10 is a block diagram showing the configuration of the channel codec.

In the figure, reference numeral 801 is a channel codec, which is composed of an ASIC. Further, 802 is a wireless unit, 803 is an ADP built in a wireless telephone, etc.
A CM codec 804 is a CPU of a wireless telephone or a wireless adapter.

Further, inside the channel codec 801, the radio control section 805 controls the radio section to control transmission / reception switching and frequency hopping. Further, it has a function of performing carrier detection prior to data transmission. ADPCM codec i / f806 is ADPCM
An interface for exchanging serial data and a synchronous clock for exchanging audio signals with the codec 803.

The CPU i / f 807 is an interface for exchanging control information with the CPU 804, and has a built-in register for storing the state and operation mode of each unit in the ASIC. Then, control of each part of the ASIC is performed according to a control signal from the CPU 804 or the state of each part in the ASIC.

The transmission frame processing unit 808 uses the ADPCM
A signal from the codec and logical control data input from the CPU 804 are assembled into the transmission frame shown in FIG. The reception frame processing unit 809 extracts control information and audio data from the frame of the signal from the radio unit, and
It is passed to the CM codec i / f806 and the CPU i / f807. The synchronization processing unit 810 is composed of a DPLL, reproduces a clock from a received signal, and captures bit synchronization.

Hopping pattern registers 811, 81
2 is a register for storing the hopping pattern,
It plays an important function in the present invention.

FIG. 11 shows the hopping pattern register 8
It is a block diagram which shows the structure of 11,812.

The registers 821 to 840 have BF1 to BF20.
It is a 5-bit register that stores the frequency number corresponding to. The data bus 841 is a CP via the CPU i / f.
It is connected to the U data bus. The address bus 842 and the BF number register 843 are selectively connected to the address decoding unit 845 by the selector 844. The BF number register 843 stores the BF at each time point.
It has a number.

The address decoding unit 845 has the register 8
It decides which of 21 to 840 to access. The data bus 846 is a 5-bit data bus that controls the frequency synthesizer in the wireless unit via the wireless control unit 805.

When the CPU sets the frequency, the frequency number data is written in the I / O address of each of the registers 821 to 840. In this case, the address bus is decoded and the data is written in the predetermined frequency register. During normal operation, the data of the BF number register is input to the address decoding unit, and the registers 821 to 84 are sequentially input.
Read access to 0. The frequency number information stored in the frequency register having the number output from the BF number register is output to the bus connected to the wireless unit and written in the frequency synthesizer of the wireless unit at a predetermined timing.

The basic operation of this ASIC will be described below. 1. CPU 804 sends control information to be added to the transmission data frame.
From the CPU i / f 807. When the ASIC is used in the wireless-only telephone and the connection device in the main device, the transmission frame processing unit 808 assembles the transmission frame together with the data from the ADPCM codec 803. When the ASIC is used in the data terminal, the transmission frame processing unit 808 assembles the transmission frame together with the error-correction-coded burst data. When assembling the frame, the data is scrambled. This is necessary to maintain DC balance during wireless transmission. The radio control unit 805 takes the timing at which the reception signal ends and, after carrier sensing, performs radio unit 8
02 is transmitted, and the transmission frame is passed to the wireless unit 802. 2. Reception The radio control unit 805 switches the radio unit 802 to reception when data to be transmitted ends, and waits for a reception frame. Then, upon receiving the received frame, after descrambling the data, control information and data are extracted from the received frame. The control information is passed to the CPU 804 via the CPU i / f 807.

The received frame is PCF or PPF
, The received data is ADPCM codec i
/ F806, and if it is a wireless phone, ADPCM
The data is output as voice through the codec 803, and is sent to the communication channel if the main device is used.

When the received frame is BDF, the received data is transferred to the memory in the data terminal. 3. Handling of Logical Control Data (3-1) At the time of non-communication The mobile station stands by at a frequency previously assigned by the main apparatus and receives the LCCH-T transmitted from the main apparatus at regular intervals. At this time, the LCCH sent from the main device includes information such as whether or not there is an external line incoming call and whether or not there is a call request at the wireless telephone side. The wireless telephone transmits the LCCH extracted by the reception frame processing unit to the CPU. After that, the LCC sent to the main unit specified by the CPU
H is sent to the main unit on the LCCH-R in the same frame. In this way, the wireless telephone repeats this procedure until an outgoing or incoming call occurs. (3-2) At the time of communication The case where the wireless telephone A makes a call will be described as an example.
It is assumed that the wireless telephone A exchanges the LCCH with the main unit on the non-communication frequency channel F1. The wireless telephone A monitors the LCCH from the main unit on the frequency channel F1 in the procedure described in (3-1) until a call is generated. Then, when a call is made in the wireless telephone A, the LCCH-R sent to the main unit in the procedure of (3-1)
And sends it to the main unit. The LCCH that informs whether communication is possible from the main apparatus is determined by the LCCH transmitted on the frequency channel F1 after 100 ms.

If the contents of the LCCH from the main unit after the call request indicates that the line is full and connection cannot be made,
The wireless telephone A notifies the user that the telephone is busy.

If the contents of the LCCH from the main unit after the call request is shown to be connectable, the same LCCH-
In T, a time slot of a voice channel used for a call is specified. For example, if "1" is designated, it indicates that communication is performed using T1 and R1. (Regarding Frequency Hopping Pattern) FIG. 12 is an explanatory diagram showing the concept of frequency hopping used in the system of this embodiment.

In the system of this embodiment, 1M using the 26 MHz band which is approved for use in Japan.
26 frequency channels wide in Hz are used. Considering the case where there are frequencies that cannot be used due to interference noise or the like, 20 frequency channels are selected from the 26 channels, and frequency hopping is performed on the selected frequency channels in a predetermined order.

In this system, one frame has a length of 5 ms, and the frequency channel is hopped for each frame. Therefore, the length of one cycle of one hopping pattern is 100 ms.

In the figure, different hopping patterns are shown as different patterns. As described above, by using a pattern in which the same frequency is not used at the same time in each frame, it is possible to prevent a data error or the like from occurring.

Further, when accommodating a plurality of connecting devices, it is also a feature of this system that different connecting devices use different hopping patterns in order to prevent interference between the connecting devices.

Then, these hopping patterns are
It is set in the hopping pattern register of the channel codec in the connection device and the wireless terminal, and the frequency data is written in the frequency synthesizer in the wireless unit in synchronization with the frame transmission timing. (Detailed Description of Operation) As described above, in this system, a frame is assembled for communication between the main unit and a wireless telephone or data terminal, or between terminals, and the frequency to be used is switched at regular intervals. Control.

The specific operation of this system will be described below in some cases. 1. Basic operation procedure In this system, when a circuit-switched channel is used as in the case of making a call to a public line, a logical control channel (LCCH-) which is time-division-multiplexed in a frame in order to acquire the channel. T and LCCH-R)
Is used to determine the slot to be used and the hopping pattern, and when using the packet switching channel, the hopping pattern is predetermined.

However, immediately after the power is turned on, the terminal does not recognize the hopping pattern for exchanging the logical control channel. Therefore, it waits at an arbitrary frequency and receives a frame at that frequency. When the first frame is received, the frequency information of the next frame contained therein is fetched, and the frequency hopping is started. When a plurality of connecting devices are used, the hopping pattern used by the connecting device that can receive the frame for the first time is followed.

Immediately after the power is turned on, which terminal is assigned to which frequency is not determined. Therefore, when the power is turned on, the registration of the ID of each terminal and the assignment of the logical control channel frequency are performed in the setting mode.

When the logical control channel is allocated,
Each terminal enters the intermittent reception state, and receives only the logical control data addressed to itself. Also, only when data to be transmitted to the main device occurs, the LCCH-
Using R, the data is transmitted to the main unit.

The detailed operation in some cases will be described below. 2. Operation at Power-on of Main Device (Connection Device) and Wireless Terminal (Setting Mode) This is a mode for registering an ID and setting the frequency of a logical control channel to be used.

FIG. 13 is an explanatory diagram showing an operation sequence when the main device (connecting device) and the wireless terminal in this embodiment are turned on. Further, FIG. 14 is a flowchart showing the operation of the main device (connection device) when the power is turned on in the present embodiment, and FIG. 15 is a flowchart showing the operation of the wireless terminal when the power is turned on in the present embodiment. (1) Description of operation of main device (connecting device) when power is turned on First, when the power switch of the main device 1 (connecting device 2) main body is turned on, the main device 1 (connecting device 2) causes S22 in FIG.
After initializing the main body with 01, in S2202,
A hopping pattern for frequency hopping for a PCF that exchanges logical control data is determined. In particular,
The carrier intensity of all channels is measured, 20 channels with low carrier (noise) levels are selected, and arranged in order of frequency number to form a hopping pattern. It is also possible to obtain different hopping patterns by shifting this hopping pattern in time.

When the hopping pattern is determined in this way, this hopping pattern is written in the channel codec in the connection device (S2203).

First, the procedure for writing to the channel codec will be described. The hopping pattern is a BF of 1 to 20 indicating a time unit, and indicates which frequency is used. Therefore, the setting can be completed by sequentially writing the frequency numbers in the 20 8-bit registers corresponding to BF1 to BF20 in the channel codec.

In the case of the present embodiment, since there are 20 frequency channels, any one of 1 to 26 will be set in each register.

When the setting of the hopping pattern in the channel codec is completed in this way, it becomes possible to perform the transmission operation while switching the frequency. Specifically, in synchronization with the frequency switching timing signal generated by the channel codec, the frequency number corresponding to the BF number of the frame is automatically read and written in the frequency synthesizer in the radio unit. The frequency switching timing signal is a field indicated by CF in FIG. 8 (1).

Subsequently, in step S2204, the PCF frame to which the hopping pattern (frequency hopping in the next unit time) and the ID of this system are added is transmitted to the wireless terminal 103. At this time, I in the PCF frame
Part D (FIG. 9 (1)) includes the system ID, and
The LCCH section (FIG. 9 (3)) includes free control channel information that can be used on the wireless terminal side.

Next, if the main device 1 (connecting device 2) receives the information for position registration such as the system ID and the wireless terminal ID from the wireless terminal 103 (S2205), S
In 2206, the ID of the wireless terminal 103 is stored, a control channel for transmitting wireless communication control information addressed to the wireless terminal 103 is determined, and this is determined in S2207.
(2103 in FIG. 13). (2) Description of Operation when Powering on Wireless Terminal First, when the power switch of the main body of the wireless terminal 103 is turned on, a setting mode is set, and the wireless terminal 103 sets S23 in FIG.
01 initializes the main body. Subsequently, in step S2302, the ID of the wireless terminal 103 is manually input, and the wireless terminal 103 stores this ID.

Next, in step S2303, the PCF frame from the main device 1 (connecting device 2) is received, so that a reception standby state is set at an arbitrary frequency. Then, the procedure proceeds to S2304,
If the PCF frame from the main device 1 (connecting device 2) can be received, the system ID is recognized and stored from the ID part (FIG. 9 (1)) in the PCF frame in S2305, and the LCCH part (FIG. 9 (3) is used). )), Free channel information (frequency at which the PCF frame is transmitted from the wireless terminal to the main device) is acquired. Also, the hopping pattern sent from the main device as the logical control data is recognized, and this is written in the hopping pattern register of the channel codec (S2306). The specific writing method is the same as the operation when the main device power is turned on.

When the hopping pattern and the system ID are known, the wireless terminal 103 determines the system ID in the idle control channel obtained by the LCCH section.
A frame (2102 in FIG. 13) to which the ID information of the wireless terminal 103 itself is added is transmitted to the main device (S23).
07).

After that, when the control channel frequency designation information is received from the main device 1 (connection device 2), intermittent reception is started on the designated control channel (S2308).
Then, the setting mode shifts to the normal mode. 3. FIG. 16 is an explanatory diagram showing an external line transmission sequence of the present embodiment, and FIG. 17 is a flowchart showing an operation of the wireless dedicated phone 3 at the time of external line transmission of the present embodiment. Yes, and also Figure 1
FIG. 8 is a flowchart showing the operation of the main device 1 at the time of making an outside line in this embodiment. FIG. 19 is a flow chart showing a control state of the wireless unit in the case where the normal operation is performed, such as the case of the outside line transmission.

Since the hopping pattern used when making an outside line is the same as the pattern used when exchanging control information, it is not necessary to set the hopping pattern again if it is set when the terminal is started up. The channel codec reads the frequency number information from the hopping pattern register in synchronization with the frame assembly timing, and controls the radio unit.

The specific operation procedure will be described below. First, in the wireless telephone 3, the key matrix 41
When the outside line key arranged in 4 is pressed (S2501),
The wireless telephone 3 causes the outside line LED of the display unit 413 corresponding to the pressed outside line button to transmit and blink (S250).
2) The external line transmission signal (2402) is transmitted to the main device 1 via the connection device 2 (S2503). This external line transmission signal is transmitted by the LCCH-R of the PCF frame shown in FIG. 8 (1) on the wireless link between the wireless telephone 3 and the connection device 2. The device is notified.

Main device 1 which receives an outside line transmission (2401)
Determines whether an outside line can be transmitted (S2601).
Here, if the outside line is free and transmission is possible, the outside line to be transmitted and which voice channel (T1 to T
4, R1 to R4). External line transmission permission (240
3) is transmitted to the wireless telephone 3 via the connection device 2 (S2602), and an outside line is captured (S2603). This outside line transmission permission is transmitted on the LCCH-T of the PCF frame.

Upon receiving the outside line transmission permission signal (2404) (S2504), the wireless telephone 3 synchronizes with the voice channel designated by the parameter sent by the permission signal. When the transition to the voice channel in the wireless telephone 3 is completed, a voice channel connection completion signal (2406) is transmitted by LCCH-R (S2505).

When the connection device 2 receives the outside line transmission permission from the main device 1, the connection device 2 receives a predetermined voice channel by the channel codec 307, creates a route to be passed to the main device 1, and outputs the voice from the wireless telephone 3. The main device 1 is notified of the channel connection completion (2405).

The main unit 1 completes the voice channel connection (24
05) (S2604), the wireless telephone 3
Assuming that the side is ready, the external line display green normal light instruction (2407) is transmitted to light the external line LED to green (S407).
2605). In addition, the communication path with the captured outside line is connected (S2606). The wireless telephone 3 receives the outside line display green ordinary light instruction signal (2408) (S2506), turns on the outside LED, turns on the communication line inside the wireless telephone 3, and sets the dial tone (2411). The user listens (S2507). In addition, in order to turn on the outside line LED of the wireless telephone 3 other than the wireless telephone 3 that has transmitted the outside line, the outside line display red normal light instruction (2409) is transmitted.

Then, the wireless telephone 3 which receives the dial from the key matrix 414 transmits it to the main unit 1 as a dial signal (2413) (S2508). The end of the dial is monitored by a timeout (S2509), and when the timeout is reached, the telephone is busy (S2510).

In the main unit 1, the dial (2412) 1
When the digit is received (S2607), the dialing is started to be transmitted to the outside line, and the transmission is monitored by timeout (S2608). When the dial transmission is completed, the telephone is busy (S2609).

Then, the call ends, and the wireless telephone 3
Is on-hook (S2511), an on-hook signal (2416) is sent (S2512). The on-hook (2415) is transmitted to the main device 1 (S2610), and the voice channel disconnection (2417) is transmitted (S261).
1).

The main unit 1 cancels the allocation of the voice channel to the wireless telephone 3. Further, main device 1 transmits an outside line display turn-off instruction (2419, 2421) to turn off the outside line LED of wireless telephone 3 (S261).
2).

Upon receiving the voice channel disconnection signal (2418), the wireless telephone 3 opens the communication path (S251).
3) Then, the external line display turn-off instruction signal (242)
0, 2422), the external LED is turned off (S251).
4).

As described above, it becomes possible to make a call to the outside line using the circuit switching channel. A feature is that when a call is made to the main device, usable communication channels are allocated. 4. Processing when data is transmitted from the computer to the printer Next, the communication operation between the data terminals will be described with reference to FIG. Here, as an example of communication between data terminals, a process in the case of transmitting data from a computer to a printer in a burst will be described. In this case, since the hopping pattern for data communication is assigned to the data terminal, it is necessary to set the second hopping pattern in the channel codec.

First, the printing application program of the computer is activated (S2701). Then, the wireless adapter driver installed in the data terminal operates and sends a data transmission request and a destination number (extension number of the printer) to the wireless adapter 4 via the communication interface unit 506 (S2702).

Next, the wireless adapter enters into a calling procedure. A call request command is emitted to the main unit, and the hopping pattern is LCCHed to the wireless adapter that received the call request.
Notification is made using T (S2703).

The wireless adapter writes the received hopping pattern in the second hopping pattern register 812 (S2704). This writing procedure is the same as the procedure when starting up the main device.

Second hopping pattern register 812
After writing to the CN, the CN sent from the main unit
The BF field in T-T is referred to, the hopping pattern register corresponding to the basic frame number at that time is read, and the frequency synthesizer is controlled at a predetermined timing. The timing to write to the frequency synthesizer is
It is a CF field in the latter stage of CNT-T in FIG. 8 (3).

As described above, when the predetermined frequency is set in the radio section, carrier detection is performed in the carrier sense field of the BDF (S2707). If a carrier is detected during this period, it is considered that the other terminal is using the BDF, so the data transmission is stopped (S270).
9). If the carrier is not detected, the other terminals are BD
Since it is considered that F is not used, data transmission is started (S2710). The data is read from the memory in the wireless adapter and sent out for 306 bytes (S271).
1).

In the contention control based on carrier sense, if all terminals detect carriers at the same timing, the frequency of collision increases. Therefore, the timing for starting carrier sense and the timing for starting carrier transmission must be randomly selected within the range of a predetermined carrier sense time.

On the other hand, the printer on the receiving side also receives data while switching the frequency according to the hopping pattern assigned to the BDF. Of the received data, only the data to which the address of the printer is added is taken into the internal memory as the data addressed to itself. When it is necessary for the printer to notify the computer of error information and the like, the printer will perform a transmission procedure.

In this way, by using the BDF, it becomes possible to transmit the data of the computer to the printer at the maximum transmission rate of about 492 kbps. 5. Frequency Change Process When Interference Occurs Finally, a process when the frequency to be used needs to be changed due to the occurrence of the interference will be described.

The main device recognizes the unusable frequency by the carrier sense in the connection device or the notification from the wireless terminal. In this case, it is necessary to change to a hopping pattern that does not use that frequency.

Carrier sense is performed when the power is turned on, one frequency is selected from the available frequencies, and a new hopping pattern is generated. The main device is
A new hopping pattern is set in the channel codec and all terminals are notified.

The wireless terminal receiving the new hopping pattern information sets the hopping pattern in the channel codec, and the changing procedure is completed.

When setting the channel codec, only the changed BF number can be set again.

As described above, according to the present embodiment, in the frequency hopping communication system, the CPU allows the hopping pattern to be set in the channel codec, so that even if a large-capacity ROM or the like is not built in, interference or the like can be prevented. It becomes possible to easily change the frequency at that time.

In the above embodiment, the frequency number information written in the hopping pattern register is 1 to 2
6 was assumed. However, it is possible to write an optimum value depending on the specifications of the frequency synthesizer in the radio unit.

Further, in the above-mentioned embodiment, the switching communication system in which the centralized control station synchronizes the entire system has been described. However, it is possible to realize a similar hopping pattern setting method even in a system in which no centralized control station exists. In this case, each terminal independently measures the radio wave environment to determine the hopping pattern, and the CPU writes the hopping pattern in the register in the channel codec.

In the above embodiment, the communication network for the premises was assumed, but the system configuration is as follows.
It is not limited to this. For example, the present invention can be applied to a system using the frequency hopping method even in an outdoor system such as a car telephone system.

[0148]

As described above, according to the present invention,
In the frequency hopping communication system, by allowing the CPU to set the hopping pattern in the memory or the register, it is possible to easily change the frequency at the time of interference or the like without incorporating a large capacity ROM or the like. Become.

Specifically, according to the first invention of the present application, it is possible to use a hopping pattern determined by the CPU or the like according to the radio wave condition. According to the second invention,
The frequency can be set for each time unit. Further, according to the third aspect, it becomes possible to set only the frequency in the time unit that the CPU or the like has determined to require the setting.

According to the fourth invention, it is possible to transmit a frame based on the hopping pattern set by the CPU or the like. According to the fifth invention,
It is possible to prevent occurrence of frequency collision between wireless terminals. According to the sixth aspect, the wireless terminal can obtain the information necessary for setting the hopping pattern.
According to the seventh aspect, the wireless terminal can operate according to the hopping pattern optimized by the system.

Further, according to the eighth invention, it is possible to prevent mutual interference between all wireless terminals and the central control station. Further, according to the ninth aspect, it is possible to perform peer-to-peer data transmission / reception between wireless terminals while transmitting / receiving control information to / from the main device according to the first hopping pattern. According to the tenth invention,
The device can be reduced in size.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a system configuration according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a main device of the embodiment.

FIG. 3 is a block diagram illustrating a configuration of a connection device according to the embodiment.

FIG. 4 is a block diagram showing a configuration of the wireless telephone according to the embodiment.

FIG. 5 is a block diagram showing a configuration of a wireless adapter of the above embodiment.

FIG. 6 is a block diagram showing a configuration of a wireless adapter with a built-in modem according to the embodiment.

FIG. 7 is a block diagram showing a configuration of a wireless unit of the above embodiment.

FIG. 8 is an explanatory diagram showing a frame format used in the above embodiment.

FIG. 9 is an explanatory diagram showing a frame format used in the above embodiment.

FIG. 10 is a block diagram showing a configuration of a channel codec of the above embodiment.

FIG. 11 is a block diagram showing a configuration of a hopping pattern register of the above embodiment.

FIG. 12 is an explanatory diagram showing a frequency hopping method used in the above embodiment.

FIG. 13 is an explanatory diagram showing a sequence when the power is turned on in the embodiment.

FIG. 14 is a flowchart showing the operation of the main device of the above embodiment when the power is turned on.

FIG. 15 is a flowchart showing an operation of the wireless terminal of the above embodiment when the power is turned on.

FIG. 16 is an explanatory diagram showing a sequence at the time of making an outside line in the above embodiment.

FIG. 17 is a flowchart showing an operation of the wireless telephone of the above-described embodiment at the time of making an outside line call.

FIG. 18 is a flow chart showing the operation of the main device of the above embodiment when making an outside line.

FIG. 19 is a flowchart showing a peer-to-peer data communication operation of the above-described embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main apparatus, 2 ... Connection apparatus, 3 ... Wireless telephone, 4 ... Wireless adapter, 5 ... Data terminal, 7 ... Analog public line, 9 ... Digital public line, 10 ... Single telephone, 11 ... Facsimile.

Claims (10)

[Claims] 1. In a frequency hopping communication system using a frequency hopping system for switching a frequency to be used for every fixed period, a memory means for storing number information corresponding to a frequency to be used for each time unit, and a frequency to the memory means. And a control means for writing number information corresponding to the frequency hopping communication system. 2. The frequency hopping communication system according to claim 1, wherein the storage means is composed of a register having a different address for each time unit. 3. The frequency hopping communication system according to claim 1, wherein the control means writes frequency number information for each time unit in the storage means. 4. The number information according to claim 1, wherein the number information is stored in a unit for assembling data to be transmitted into a frame and a storage unit for storing number information corresponding to a frequency in synchronization with a frame transmission timing. A frequency hopping communication system comprising: a reading unit; and a unit that controls a frequency synthesizer of a wireless transmission unit based on the read number information. 5. The centralized control station according to claim 1, further comprising: a centralized control station having means for determining a hopping pattern; and a wireless terminal receiving the hopping pattern information determined by the centralized control station. A frequency hopping communication system. 6. The frequency hopping communication system according to claim 5, wherein the hopping pattern information includes information that associates each time unit with a frequency number. 7. The frequency hopping communication system according to claim 5, wherein the control circuit in the wireless terminal receiving the hopping pattern information writes the frequency number information for each time unit in a predetermined storage means. . 8. The frequency hopping communication system according to claim 5, wherein all the wireless terminals and the central control station have means for switching frequencies at the same timing. 9. The centralized control station and / or the wireless terminal according to claim 1, wherein the centralized control station and / or the wireless terminal has storage means for storing a second hopping pattern, and is used when communication is performed between the wireless terminals. Is a frequency hopping communication system having means for switching frequencies according to a second hopping pattern. 10. The frequency hopping communication system according to claim 1, wherein the storage means is housed inside a channel codec for assembling / disassembling a frame.