JPH0937330A - Radio communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently report an opposite equipment of free/block information and to relax the competition of control channels by providing a radio communication equipment with an establishing means for a channel with a communication terminal, a free/block information storing means and a transmitting means to the communication terminal. SOLUTION: A device 2 establishes a radio transmission channel and a telephone set 3 executes communication with a line wire and mutual communication with an extension. An adaptor 4 is connected to terminals 5, 10, 11, 12, etc., to transmit data. A CPU 201 controls the whole equipment 1 and a ROM 202 stores a program for controlling the CPU 201. A RAM 203 stores various data and presents an operation work area. A channel part 204 executes time-division exchange and a line i/f 205 controls a PSTN line. A line i/f 206 controls an ISDN line and a line i/f 207 executes feeding, detection, reception, transmission, etc., so as to store an SLT 10. A circuit 209 sends various tones and a device 210 transmits/receives a call and a control signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wireless communication.

[0002]

2. Description of the Related Art Conventionally, in a digital wireless transmission system such as a digital mobile phone or a digital cordless phone, a frequency band for a control channel and a frequency band for a communication channel are separately used. Then, when using the control channel, check whether the frequency of the control channel is used, and if the frequency for the control channel is used, it is determined that the control channel of that frequency is in use, and the frequency for the control channel is used. I was looking for another frequency in my frequency band and was looking for a control channel for an unused frequency.

In some systems using frequency hopping, which is one of the spread spectrum systems, the frequency band for the control channel and the frequency band for the communication channel may not be separated. In such a system, the wireless terminal waits for control information transmitted by the exchange at an arbitrary frequency,
When the control information is received, a request for using the control channel is sent to the exchange in order to use the control channel carrying the control information.

[0004]

In the digital radio transmission system of the above-mentioned digital portable telephone or digital cordless telephone, when the control channel is used, it is necessary to check the frequency of the control channel one by one. There was a problem that it took time to acquire a channel.

Further, in the system using the frequency hopping, the wireless terminal cannot judge whether the control channel is being used by another wireless terminal when receiving the control information, and controls the exchange. A request to use the channel is sent, and it is determined whether the control channel can be used or not based on the information returned from the exchange.

[0006]

In order to solve the above problems, the present invention provides, in a wireless switching device for exchanging at least one wireless communication terminal, an establishing means for establishing a wireless communication path with the wireless communication terminal. A wireless switching device comprising: a storage unit that stores the availability information indicating whether or not a control channel is used; and a transmission unit that transmits the availability information stored in the storage unit to the wireless communication terminal. provide.

[0007] Further, in the wireless communication device, receiving means for receiving air-block information indicating whether or not the control channel is used,
There is provided a wireless communication device comprising: an analysis unit that analyzes the air-closure information and an establishment unit that establishes a wireless communication path with a communication partner device according to an analysis result of the analysis unit.

[0008] Also, at least one wireless communication terminal,
In a wireless switching system including a wireless switching device that exchanges the wireless communication terminal, the wireless switching device includes first establishing means for establishing a wireless communication path with the wireless communication terminal,
The wireless communication terminal includes a storage unit that stores the availability information indicating whether or not a control channel is used, and a transmission unit that transmits the availability information stored in the storage unit to the wireless communication terminal. A second receiving means for receiving the air-closing information transmitted from the means, an analyzing means for analyzing the air-closing information, and a second establishing a wireless communication path with the wireless switching device according to an analysis result of the analyzing means. There is provided a wireless switching system having an establishing means.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) In the present embodiment, a detailed description will be given of a case where frequency-hopping digital radio communication is used for transmission between an extension wireless terminal of a switching system and a connection device and between wireless terminals. To do.

In this embodiment, I in Japan
SM band (industrialscientific
Assuming that the frequency hopping is 20 channels out of 26 waves (channels) and hopping is performed, the control channel between the connection device and the wireless terminal is one frame (hopping cycle, that is,
It is assumed that one voice signal channel in a signal train while staying at one frequency) is transmitted / received in one frame and multiplexed for four voice slots.

The number of wireless terminals with which one connection device can establish a control channel is equal to the number of control channels corresponding to each frequency to be hopped, which is a maximum of 20. This number does not depend on 4 which is the number of call slot multiplexing of the call channel between the connection device and the wireless terminal.

That is, if 20 wireless terminals exist within the range where wireless communication is possible with one connection device, and if a control channel is established by registering an ID with the connection device, then 4 channels of the connection device. If there is a vacancy in the call channels of the above, any of the 20 wireless terminals can simultaneously communicate with the public line by using the call channels of the corresponding connection devices up to a maximum of four.

Further, in the present embodiment, the call slot multiplex number of the call channel between the connection device and the wireless terminal is set to 4, but the time division multiplex number is the processing speed of the wireless device and the processing of the control unit. Needless to say, the number may be other than 4 depending on the capability and the like, that is, the number of time division multiplexing = 1, that is, time division multiplexing may not be performed.

(System Configuration) A configuration diagram of a system assumed in this embodiment is shown in FIG.

The present system accommodates a public line 102 and has an exchange 101 having a switching function and a wireless connection function, and a plurality of wireless dedicated telephones 103-A, 103-for communicating control data and voice data with the exchange 101. B, data terminal devices 104-A to 104- for performing control data communication with an exchange and direct data communication between terminals.
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 wireless adapter that controls wireless communication between the data terminal and the main device are combined. The data terminal is not limited to the computer 104-A, but the printer 104-B, the copying machine 104-C, the video conference terminal 104-D, the facsimile 104-E, and the LA.
The N bridge 104-F, other various terminals that perform data processing such as an electronic camera, a video camera, and a scanner correspond to the N bridge 104-F.

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. The detailed configuration and operation will be described below.

(Structure of Main Unit) First, the structure of the main unit accommodating the public line will be described.

FIG. 2 is a diagram showing a system configuration and a main device configuration of the present embodiment. Reference numeral 1 denotes a main exchange for accommodating a plurality of outside lines and a plurality of terminals and exchanging calls between them. The main device 2 which is the main part of the system receives wireless terminals (wireless dedicated telephones, data terminals to which a wireless adapter is connected, which will be described later) of the wireless device under the control of the main device in order to be accommodated in the system. It is a connection device that controls and establishes a wireless transmission path.

Reference numeral 3 is a wireless-only telephone for communicating with an external line accommodated in the main unit via the connection device 2 and for mutual extension communication. Reference numeral 4 is a wireless adapter that enables wireless data transmission by connecting to a data terminal 5 such as a personal computer or a printer, an SLT (single telephone) 10, a facsimile 11, and an ISDN terminal 12.
6 is a PSTN which is one of the external line networks accommodated in the main device 1.
(Existing public network), 7 is PST which is an outside line from PSN6
N line, 8 is I which is one of the external line networks accommodated in the main unit 1.
SDN (Digital Communication Network), 9 is an ISDN line which is an external line from the ISDN 8. Reference numeral 10 denotes an SLT (single telephone) which is one of the terminals accommodated in the main device 1.

The internal configuration of the main unit 1 will be described below. Reference numeral 201 denotes a central unit of the main unit 1, which is a CPU that controls the entire main unit 1 including exchange control. 202 is the CPU 2
ROM storing the control program 01, 203 is C
The RAM stores various data for controlling the PU 201 and provides a work area for various calculations. 20
4 is a call exchange (time division exchange) under the control of the CPU 201.
A call path unit that controls the P, 205 is P under the control of the CPU 201.
Incoming call detection to accommodate STN line 7, selection signal transmission,
It is a PSTN line i / f for performing PSTN line control such as DC loop closure. 206 is an IS under the control of the CPU 201.
It is a line i / f which supports ISDN layers 1 and 2 for accommodating the DN line 9 and controls the ISDN line. Reference numeral 207 denotes an SLTi / f for performing power supply, loop detection, selection signal reception, ringing signal reception, ringing signal transmission, and the like under the control of the CPU 201, so as to accommodate the SLT 10. Reference numeral 208 denotes a telephone unit having a transmitter / receiver, a dial key, a call circuit, a display, and the like, which functions as an extension multi-function telephone under the control of the CPU 201 when energized and functions as an SLT when a power failure occurs. Reference numeral 209 is a tone transmitting circuit for transmitting various tones such as PB signal, dial tone and ring tone. 210 is C
Under the control of the PU 201, a connection device i / f that transmits and receives a call signal and a control signal to and from the connection device 2 to accommodate the connection device 2.
It is.

(Structure of Connection Device) FIG. 3 is a drawing showing the structure of the connection device 2. Reference numeral 301 is the center of the connection device 2 and is responsible for control of the entire connection device 2 including call channel control and radio section control. It is a CPU. 302 is a ROM storing the control program of the CPU 301, and 303 is an EEPR storing the calling code (system ID) of the exchange system.
The OM and 304 store various data for controlling the CPU 301 and provide a work area for various calculations.
AM. Reference numeral 305 denotes a main device i / f that transmits and receives a call signal and a control signal to and from the connection device i / f 210 of the main device 1 under the control of the CPU 301. 306, under the control of the CPU 301, transmits a PCM-coded call signal from the main unit 1 to
The PCM code is converted and transmitted to a channel codec 307, which will be described later, and the AD from the channel codec 307 is also transmitted.
A PCM / ADPCM conversion unit for converting a PCM-coded communication signal into a PCM code and transmitting the PCM code to the main device 1. Under the control of the CPU 301, a channel codec 307 performs processing such as scrambling on the ADPCM-coded speech signal and control signal and time-division-multiplexes them into a predetermined frame. Under the control of the CPU 301, 308 modulates the framed digital signal from the channel codec 307 and wirelessly transmits it from the antenna, and demodulates the signal wirelessly received from Antana to process it into a framed digital signal. , The radio section.

(Structure of Radio Dedicated Telephone) FIG. 4 is a diagram showing the structure of the radio dedicated telephone 3, in which 401 is the center of the radio dedicated telephone 3, which is the center of the radio dedicated telephone 3 including the radio section control and call control. It is a CPU that controls the control. Reference numeral 402 denotes a ROM in which a control program for the CPU 401 is stored, 4
03 is a call code (system ID) of the exchange system,
EEPROM for storing the sub ID of the wireless telephone 3;
A RAM 404 stores various data for controlling the CPU 401 and provides a work area for various calculations. Reference numeral 405 is a call circuit that inputs and outputs a call signal from a handset 410, a microphone 411, and a speaker 412, which will be described later, under the control of the CPU 401. 406 is the CPU 4
Under the control of 01, the analog voice signal from the call circuit 405 is converted into an ADPCM code and transmitted to a channel codec 407, which will be described later, and the DPCM-coded call signal from the channel codec 407 is converted into an analog voice signal. This is an ADPCM codec for transmitting to the call circuit 405. 407 is A under the control of the CPU 401.
It is a channel codec that performs processing such as scrambling of DPCM-coded communication signals and control signals and time-division-multiplexes into a predetermined frame. 408 is the CPU 401
Under the control of, the radio unit that modulates the framed digital signal from the channel codec 407 and wirelessly transmits it from the antenna, demodulates the signal wirelessly received from the antenna and processes it into a framed digital signal. Is. Reference numeral 410 is a handset for inputting / outputting a voice signal for communication, 411 is a microphone for collecting and inputting the voice signal, 41
Reference numeral 2 is a speaker for outputting a voice signal in a loud voice. A display unit 413 displays a dial number input from a key matrix to be described later and a usage status of an outside line. Reference numeral 414 is a key matrix including 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 diagram showing a configuration of a data communication terminal that can be accommodated in the system and an internal block configuration of a wireless adapter connected to the data terminal.

In the figure, 501 is a data terminal and 50
2 is a wireless adapter, 503 is a wireless unit, and the data terminal 501 is connected to the wireless adapter 502 via a communication cable or an internal path, for example, a personal computer, a workstation, a printer, a facsimile,
Refers to other data terminal equipment.

A main control unit 504 includes a CPU, interrupt control, and DMA (Direct memory ac).
access control) is composed of a peripheral device for controlling, a system clock oscillator, etc., and controls each block in the wireless adapter.

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

Reference numeral 506 denotes a communication i / f unit, which is a communication i / f that is standardly equipped with a data terminal device such as the data terminal 501 described above, for example, a communication i / f such as RS232C, Centronics, LAN, or a personal computer. An internal bus of a computer or workstation, for example, an ISA bus, PCMCIA i / f, or the like is applicable.

Reference numeral 507 denotes a terminal control unit, which is used for communication i / f5.
It manages various communication controls required for data communication between the data terminal 501 and the wireless adapter 502 via 06.

Reference numeral 508 is a channel codec for performing frame processing and radio control, and its internal configuration is shown in FIG.
The data assembled into a frame by the channel codec is transmitted to the exchange 101 or the opposite terminal via the wireless unit.

An 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.

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

FIG. 6 shows the configuration of a modem built-in type wireless adapter which is required when data is transmitted to a public line. In the figure, except for 511 and 512, the description is omitted because it is exactly the same as FIG. Reference numeral 511 is a modem that modulates data into a voice band signal and demodulates the signal from the ADPCM codec. Reference numeral 512 is an ADPCM codec that encodes the signal modulated by the modem. A
The channel codec 50 converts the DPCM-encoded data.
8 is assembled into a frame and transmitted to the main unit via the wireless unit 503. Alternatively, the wireless unit 503
The signal from is decomposed by the channel codec 508 and AD
It will be sent to the PCM codec.

(Structure of Radio Unit) FIG. 7 is a diagram showing the structure of a radio unit commonly used by the main unit 1, the wireless telephone 3, and the wireless adapter 4 of the present system. 601a and 601 are transmitting antennas, Reference numeral 602 is a changeover switch of the antenna 601, 603 is a band pass filter (hereinafter referred to as BPF) for removing a signal in an unnecessary band, 604 is a transmission / reception changeover switch, 605 is a reception system amplifier, and 606 is a transmission system amplifier. (With power control), 607 is 1
st. Down converter for intermediate frequency (IF), 6
08 is an up converter, 609 is a transmission / reception changeover switch, 610 is a BPF for removing a signal in an unnecessary band from the signal converted by the down converter 607, 611 is 2nd. This is a down converter for IF, and a reception form of a double conversion system is constituted by 607 and 611.

612 is 2nd. BPF for IF, 613
Is a 90 ° phase shifter, 614 is a quadrature detector 61
2, the received signal is detected and demodulated by 613.

Reference numeral 615 denotes a waveform shaping comparator, 61
6 is a voltage control type oscillator (hereinafter referred to as VCO) of the receiving system, 6
Reference numeral 17 is a low pass filter (hereinafter referred to as LPF), 618 is a PLL including a programmable counter, prescaler, phase comparator, and the like, and a frequency synthesizer of a receiving system is configured by 616, 617, and 618.

Reference numeral 619 denotes a VCO for generating a carrier signal, 6
20 is an LPF, 621 is a PLL (pha) including a programmable counter, a prescaler, a phase comparator, and the like.
se-locked loop) 619, 620, 6
A frequency synthesizer 21 for hopping is constituted by 21.

Reference numeral 622 is a transmission system VC having a modulation function.
O, 623 are LPFs, 624 is a PLL composed of programmable counter, prescaler, phase comparator, etc.
622, 623, and 624 form a transmission system frequency synthesizer having a frequency modulation function.

Reference numeral 625 denotes various PLLs 618, 621, 62.
4 is a reference clock, and 626 is a band limiting filter for transmission data (baseband signal).

The operation of this 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 a transmission system PLL 624.
Determines the frequency by the control voltage output from the circuit of the LPF 623, and generates the intermediate frequency (IF) modulated wave by direct modulation.

The intermediate frequency (IF) modulated wave generated by the frequency synthesizers 622, 623 and 624 is input to the up converter 608, and the VCO 619 and LPF are input.
620, a carrier signal generated by a frequency synthesizer composed of a hopping PLL, and then added to a transmission system amplifier 606.

The signal amplified to a predetermined level by the transmission system amplifier 606 has a signal in an unnecessary band removed by a BPF 603, and then emitted from the antenna 601 as a radio wave into space.

2. At the time of reception The signal received by the antenna 601 is removed by the BPF 603 from signals in unnecessary bands, and then the amplifier 6 of the reception system is used.
It is amplified to a predetermined level by 05.

The received signal amplified to a predetermined level has its carrier signal removed by the down converter 607 for 1 s.
t. Converted to IF frequency.

1st. The received signal of the IF has the second band after the unnecessary band signal is removed by the BPF 610. The signal is input to the down converter 611 for IF. The down converter 611 includes a VCO 616, an LPF 617, a receiving system PLL 6
18 and the signal generated by the frequency synthesizer composed of 1st. 2nd. By the input signal from IF. I
A signal having a frequency of F is generated.

2nd. The received signal down-converted to the IF frequency has its unnecessary band signal removed by the BPF 612, and is then input to the 90 ° phase shifter 613 and the quadrature detector 614.

The quadrature detector 614 performs detection and demodulation using the signal whose phase is shifted by the 90 ° phase shifter 613 and the original signal.

The data (analog data) demodulated by the quadrature detector 614 is waveform-shaped as digital data by the comparator 615 and output to an external circuit.

(Wireless Frame) In the present embodiment, as described below, a time division multiplex frame (PCF) between the connection device and the wireless terminal is provided by a channel codec of the connection device and the wireless terminal. It is configured as a frame different from the time division multiplex frame (PPF) between wireless terminals. Specifically, although the PCF and the PPF synchronize frames, they have different formats and different frequencies at the same time point with respect to the part of the communication channel. Moreover, the control channel part of PPF (CNT-T, CNT-R) and the control channel part of PCF are common (the same). The PCF communication channel sections (T1, T2, ..., R1, R2, ...) Have the same frequency as the control channel section, and the PPF communication channel sections (T1, T2, ..., R1, R2, ...) Use a different frequency than the control channel.

Then, by the call channel part of the PPF,
A call channel is established between wireless terminals without using a connection device. Also, in each wireless terminal, each slot (T1, T2, ..., R1, R2, ...) Of the call channel is selected, the call data is sent to each selected slot, and the other party calls each other. Communication is performed by recognizing the slots from which data is transmitted and receiving the call data transmitted to the recognized slots.

When there are two or more accommodating / connecting devices, one PCF and another PCF have different frames depending on the channel codecs of the connecting device and the wireless terminal.
Specifically, the frequency of one PCF at the same time is made different.

If the number of accommodated wireless terminals exceeds the number of time-division multiplexed frames (3 in this embodiment) between wireless terminals, depending on the channel codec of the wireless terminals,
Different frames are used for one PPF and another PPF. Specifically, the frequencies of the PPF communication channel part at the same time are made different.

Further, in the present embodiment, the frequency hopping system is adopted, and the frequencies of the frames of the PCF and the PPF are switched within a predetermined time, specifically, for each frame cycle. It will be switched. For example, the frame period is 5 ms, the hopping pattern is composed of 20 frequencies, and 5 ms × 20 = 100 m
s multiframe structure.

8 to 13 show a radio frame structure used in this system.

In this system, "communication frame between connecting device and wireless terminal" (hereinafter abbreviated as PCF), "communication frame between wireless dedicated telephones" (hereinafter abbreviated as PPF), "burst data frame" (hereinafter Three different frames (abbreviated as BDF) are used. Hereinafter, the details of the internal data of each frame will be described.

FIG. 8 shows the PCF. In the figure, CN
TT is a frame synchronization signal, a control channel including a logical control channel transmitted from the connection device to the wireless terminal, CNT
-R is a control channel sent from the wireless terminal including the logical control channel to the connection device, T1, T2, T3 and T4 are voice channels sent to four different wireless terminals, R1, R2 and R3
And R4 are voice channels sent from four different wireless terminals, TR is transmission / reception switching time, and CF is frequency switching time. Also, in this figure, F1, F
“3” indicates a frequency channel used when wirelessly transmitting this frame, and indicates that the frequency is changed every frame period.

FIG. 9 shows the PPF. In the figure, CN
TT is a frame synchronization signal, a control channel including a logical control channel transmitted from the connection device to the wireless terminal, CNT
-R is a control channel sent from the wireless terminal to the connection device including the logical control channel, T1, T2 and T3 are voice channels sent to three different wireless telephones, R1 and R2 and R
Reference numeral 3 indicates a voice channel sent from three different wireless telephones, CF indicates a frequency switching time, and RV indicates a reserve. Also, in this figure, F1, F
3, F5, and F7 are frequency channels used when wirelessly transmitting this frame. Unlike PCF, the control channel C from the connection device to the wireless terminal is F1 unlike PCF.
After receiving the NT-T, the frequency channel is switched to F5, which is secured for communication between wireless dedicated telephones, and communication between wireless dedicated telephones is performed. After that, the frequency channel is switched to F1 again, and the control channel is received from the wireless-only telephone to the connecting device. Then, after switching the frequency channel to F3 and receiving the control channel from the connection device to the wireless terminal, the frequency channel is switched to F7 which is secured for the communication between the wireless dedicated telephones, and then the frequency is switched to F3 again and the wireless dedicated communication is performed. The procedure of receiving the control channel from the telephone to the connection device is repeated until the communication between the wireless telephones is completed.

FIG. 10 shows the BDF. In FIG.
NT-T is a frame sync signal, a control channel including a logical control channel transmitted from a connection device to a wireless terminal, CN
From TT onward, it is a control / data channel between data terminals, CF is a frequency switching time, CS1 is a sending terminal carrier sending time, CS2 is a receiving terminal carrier sending time, R is a transient response ramp time, and PR is a bit. A preamble for synchronization acquisition, UW is a unique word for byte synchronization acquisition, RV is a reserve (spare), and DATA is a data slot for accommodating burst data. Also,
In this figure, F1, F3, F5, and F7 are frequency channels used when wirelessly transmitting this frame. Unlike PCF, F1 is a control channel from the connection device to the wireless terminal. After the reception, the frequency channel is switched to the burst data communication secured F5, and the communication between the wireless terminals is performed. Then change the frequency channel to F
The procedure of switching to 3 to receive the control channel from the connection device to the wireless terminal, and then switching the frequency channel to F7 secured for burst data communication is repeated until the burst data communication is completed.

FIG. 11 shows the configuration of the control channel CNT-T from the connection device to the wireless terminal. In the figure, CS is carrier sense time, R is transient response ramp time, and P is
R0 is a 62-bit preamble for frequency synchronization acquisition, SYN is a 32-bit frame synchronization signal, and ID is 6
4-bit calling signal, UW is a unique word for byte synchronization acquisition, BF is a basic frame number, MF is a multiframe number, LCCHT is a logical control channel sent from a connection device to a wireless terminal, and CRT is U.
CRC (Cyclic red) from W to LCCHT
(undan check) information is shown. The numbers in the figure indicate the number of bits in this embodiment. In this embodiment, LCCHT is assigned as a logical control channel to different wireless terminals for each hopping frequency. As the content of LCCHT (logical control information), LC
It is assumed that the CHT air blockage information is transmitted.

FIG. 12 shows the structure of a communication channel. T1
Since T2, T3, T4, R1, R2, R3, and R4 have the same configuration, the transmission call channels are collectively referred to as Tn, and the reception call channels are collectively referred to as Rn. In the configuration diagram of Tn in the figure, RV is a reserve (spare), PR1 is a preamble for capturing bit synchronization of each slot, UW is a unique word for capturing byte synchronization, B is B channel information of 32 kbps, CRC is B
CRC information, GT represents gart time. In the configuration diagram of Rn, the parts in common with the configuration diagram of Tn are the same as the configuration factors of Tn. In addition, CS is a carrier sense time and R is a ramp time for transient response. The numbers in the figure indicate the number of bits in this embodiment.

FIG. 13 shows the structure of the control channel CNT-T from the wireless terminal to the connection device. CS is a carrier sense time, R is a transient response ramp time, PR1 is a preamble for capturing bit synchronization, UW is a unique word for capturing byte synchronization, LCCHR is a logical control channel sent from the wireless terminal to the connection device, CRC represents CRC information of LCCHR, and GT represents guard time. The numbers in the figure indicate the number of bits in this embodiment. In this embodiment, LCCHR is assigned as a control channel to different wireless terminals for each hopping frequency.

(Channel Codec) The above frame is processed by the channel codec. FIG. 14 shows the internal structure of the channel codec. In FIG.
1 is a channel codec, 802 is a wireless unit, 803 is an ADPCM codec built into a wireless telephone, etc.,
Reference numeral 804 is a CPU of a wireless telephone or a wireless adapter. Inside the channel codec 801, 80
A wireless control unit 5 controls the wireless unit to control transmission / reception switching and frequency hopping. Further, it has a function of performing carrier detection prior to data transmission. 80
Reference numeral 6 denotes an ADPCM codec i / f, which exchanges serial data and a synchronous clock for exchanging audio signals with the ADPCM codec 803. 8
Reference numeral 07 is a CPU i / f for exchanging control information with the CPU 804, and has a built-in register that stores the state and operation mode of each unit in the channel codec.
It controls each part of the channel codec according to the control signal from the CPU 804 and the state of each part in the channel codec. Reference numeral 808 denotes a transmission frame processing unit,
The signal from the DPCM codec and the logical control data input from the CPU 804 are assembled into the transmission frame shown in FIG. Reference numeral 809 denotes a reception frame processing unit that extracts control information and voice data from the frame of the signal received by the wireless unit 802, and uses the ADPCM codec i / f8.
06 and CPU i / f807. 810 is DPL
L (delay phase-locked loo
p) is a synchronization processing unit, which reproduces a clock from a received signal and captures bit synchronization. The basic operation of this channel codec will be described below.

1) Transmission The control information to be added to the transmission data frame is sent to the CPU 804.
From the CPU i / f 807. When the channel codec is used in the wireless-only telephone and the connection device in the seed device, the transmission frame processing unit 808 assembles the transmission frame together with the data from the ADPCM codec 806. When the channel codec is used in the data terminal, the transmission frame processing unit 808 assembles the transmission frame together with the burst data that has been subjected to error correction coding. When assembling the frame, the data is scrambled. This is necessary to maintain DC balance during wireless transmission. The radio control unit 805 switches the radio unit 802 to transmission after carrying out carrier sensing at the timing when the reception signal ends, and transmits the transmission frame to the radio unit 80.
Hand over to 2.

2) Reception The radio control section 805 switches the radio section 802 to reception when the data to be transmitted is completed, and holds a reception frame. When the received frame is received, the control information and the data are extracted from the received frame after descramble the data. Control information is sent to the CP through CPU i / f807.
Hand it over to U804.

The received frame is a PCF or PPF
, The received data is ADPCM codec i
/ F806, ADPC for wireless-only phones
It is output as voice through the M codec 803, and if it is a connection device, it is converted into a PCM code and transmitted to the main device.

When the received frame is the BDF, the received data is transferred to the memory in the data terminal.

3) Handling of logical control data (3-1) Standby: The LCCHT from the connection device, which is periodically sent, waits at the frequency assigned by the main unit in accordance with the sequence when the wireless terminal power supply is turned on, which will be described later. To receive intermittently. At this time, the LCCHT sent from the connection device includes information such as whether or not there is an incoming call to the outside line and confirmation of a call request to the wireless terminal side. The wireless terminal sends the control data extracted by the received frame processing unit to the CPU 804. After that, CPU8
Control data sent from 04 to the connection device specified by LCC
Send to connected device by HR. Thus, the wireless terminal repeats this procedure until a call or an incoming call occurs.

(3-2) At the time of communication The case where the wireless terminal A makes an outside line will be described as an example. It is assumed that the wireless terminal A exchanges the LCCH with the connection device on the frequency channel F1 during non-communication. The wireless terminal A monitors the LCCHT from the connection device on the frequency channel F1 according to the procedure described in (3-1) until an external call request is made. When the wireless terminal A makes an outside call request, the outside call request is put into the LCCHR to be sent to the connecting device according to the procedure (3-1), and is sent to the connecting device. On the other hand, the LCCHT sent by the frequency channel F1 informs the connection device side whether communication is possible.

LCCH from the connection device after the outside line transmission request
If the content of T indicates that the line is full and cannot be connected, the wireless terminal A informs the user that the line is busy.

LCCH from the connection device after the outside line transmission request
If the contents of T indicate that connection is possible, the same L
A call slot number of a call channel used for a call is designated in CCHT. For example, if "1" is designated, it indicates that communication is performed using T1 and R1. LCC
Communication is performed while switching frequency channels according to the frequency hopping pattern specified at the time of H allocation. Even when exchanging control information with the connection device after the call channel is established,
Performed by CCH-T and LCCH-R.

In the case of communication between wireless terminals, control information between wireless terminals is carried out in DATA (burst data channel),
After the communication is completed, each wireless terminal communicates to the connection device that the communication between wireless terminals has been completed on the LCCHR of the designated frequency channel, that is, in the case of the previous example, the wireless terminal A is on the frequency channel F1.

(Regarding Frequency Hopping Pattern) FIG. 15 shows a conceptual diagram of frequency hopping used in this system.

In the system of this embodiment, 26 MHz
26 frequency channels of 1 MHz width 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. So one hopping pattern (ie
The length of one cycle of (multiframe) 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. With this method, a system having a multi-cell configuration can be realized and a wide service area can be obtained.

(Explanation of Detailed Operation) As described above, in the present system, the frame is assembled for the communication between the connection device and the wireless telephone or the data terminal and between the terminals, and the frequency to be used is fixed for a certain time. The switching control is performed every time (specifically, every frame period).

The specific operation of the system of this embodiment will be described below.

1. Basic operation procedure In this system, before using the call channel,
The feature is that the call slot to be used and the hopping pattern are determined by using the logical control channels (LCCHT and LCCHR) which are time-division multiplexed in the frame. Furthermore, in order for each wireless terminal to perform intermittent reception and enable battery saving, each wireless terminal transmits and receives only on the logical control channel that transmits at the frequency assigned in the wireless terminal power ON sequence described later. Is designed.

When a plurality of connecting devices are used, the first frame containing the control channel availability information is received,
It will be placed in the management of the connected device that was able to register the ID.

Immediately after the main unit power is turned on (system is turned on), the control channel frequency to which the wireless terminal ID of the wireless terminal is also assigned is not fixed. Therefore, when starting up the system, turn on the power of each wireless terminal in the setting mode.
By doing so, the wireless terminal ID is registered and the logical control channel frequency is allocated according to the wireless terminal power ON sequence (setting mode) described later. When the wireless terminal that has already registered the wireless terminal ID once in the system after the system is started up and the power is turned on again after the battery runs out, the power of the wireless terminal is turned on in the normal mode.
By doing so, the wireless terminal ID is registered and the logical control channel frequency is allocated according to the wireless terminal power ON sequence (normal mode) described later.

When the logical control channel is allocated,
Each terminal enters the discontinuous reception state and receives only the logical control channel addressed to itself. Then, only when the data to be transmitted to the main device is generated, the data is transmitted to the main device by using the LCCHR of the assigned control channel.

When it is desired to start the communication using the communication slot of the communication channel, the logical control channel must be used to notify the main device of that fact and the slot and hopping pattern must be assigned. After these allocations are made, it becomes possible to carry out telephone calls and data transmission.

Then, the main device (connecting device) power is turned on below.
The detailed operation of the control channel empty / busy notification when the wireless terminal power is turned on will be described. It is assumed that the wireless terminal is the wireless dedicated telephone 3.

2. Control channel vacancy notification operation when main device (connecting device) power is ON and wireless terminal power is ON 2.1. Free control channel notification method 2.2. Operation when main device (connecting device) power is ON and wireless terminal power is ON (setting mode) 2.3. In the operation when the wireless terminal power is on (normal mode), the wireless terminal first performs an idle control channel acquisition operation,
Main device (connecting device) is LCCH of each control channel frequency
At T, periodically, the control channel (LCCH)
It is assumed that the control channel free / busy information indicating the free / busy information of the above is transmitted.

FIG. 16 shows the format of control channel free / busy information according to the present embodiment.

In the figure, the layer 2 ID is the ID of the connection device and the ID of the wireless terminal. LNG is the transmission data length, which is the length from CNT to the end of I. CN
T is control information indicating a frame type, a transmission sequence number, and a reception sequence number. I is an information frame, in which various information to be described later is stored.

CMD / EVT of layer 3 is a command or event code. PAR is a parameter associated with CMD / EVT. CMS is a checksum obtained by adding from CMD / EVT to the end of PAR.

The control channel free / busy information is put on the I (information frame) part of the logical control channel LCCHT, and as shown in the figure, the control channel free / busy information is used as the CMD / EVT part in the control channel free / busy information command, PAR. As the (parameter) section, the wireless terminal IDs except "00000000" and "11111111" are excluded from the system ID, the connection device ID, the wireless terminal identification number, and the hopping pattern.
It is assumed that the required number is used from “00000001”, and the wireless terminal identification number area of the control channel availability information in FIG. 16 consists of 8 bits, and if the control channel is blocked, the control channel is allocated. The wireless terminal ID of the wireless terminal is a special wireless terminal identification number "0" indicating that the control channel is free when the control channel is free.
If the control channel is reserved, "0000000" is a special wireless terminal identification number "11111111" indicating that the control channel has been reserved.

2.2. Control channel vacancy information notification operation when main device (connecting device) power is ON and wireless terminal power is ON (setting mode). FIG. 17 shows main device (connecting device) power ON and wireless terminal power ON (setting mode) related to this description. It is an operation sequence diagram at the time.

FIG. 18 is an operation flowchart relating to the present description when the main device (connecting device) is powered on.

FIG. 19 shows that the wireless terminal power supply related to the present description is turned on.
It is an operation | movement flowchart at the time of (setting mode).

Control channel when main device (connecting device) power is ON Explanation of operation of air-blocking information device: Control channel when main device 1 (connecting device 2) is power ON according to the operation sequence of FIG. 17 and the flowchart of FIG. The operation of notifying the air block information will be described. In the present embodiment, the main device periodically sends control channel availability information indicating the availability status of the control channel in the LCCHT of each hopping PCF frame regardless of the availability of the control channel. Send.

First, when the power switch of the main unit 1 (connecting device 2) main body is turned on, the main unit 1 (connecting device 2) becomes S1.
After performing the initialization processing of the main body in 801, a hopping pattern of frequency hopping (frequency pattern hopping for each frame in the multiframe) to be used in wireless communication is determined in S1802, and then in S1803 The control channel free / busy information including the system ID, the connection device ID, the free / busy information, and the hopping pattern is continuously transmitted to the LCH 3 on the LCCHT of each PCF frame.

Next, in S1804, the main device 1 (connecting device 2) requests to join the control of the connecting device 2 by means of the LCCHR corresponding to the LCCHT which transmitted the control channel availability information from the wireless terminal 3. If the received wireless terminal ID notification is received, the main device 1 (connecting device 2) checks in step S1805 that the received wireless terminal ID is not assigned to another control channel, and I received first at control channel frequency
After confirming that the notification is a D notification, in step S1806, an ID registration instruction including a system ID, a connection device ID, a wireless terminal ID, and a control channel frequency is transmitted to the wireless terminal 3 using the LCCHT of the control channel frequency. On the other hand, in step S1807, the LCC from the wireless terminal 3 is transmitted.
If the ID registration confirmation is received by the HR, S1808
Then, the wireless terminal ID of the wireless terminal 3 is read out to the RAM 203 (or RAM 304) to check if it is already registered. If not registered at S1808, the wireless terminal ID of the wireless terminal 3 is stored at the RAM 203 (or RAM) at S1809.
304), and the ID is registered in the connection device 2.
If registered in S1808, the process proceeds to S1810. S18
In step 10, the control channel frequency of the wireless terminal 3 is set to the RAM 203 (or the RAM 30).
4) and stored as a control channel frequency for the wireless terminal 3.

In S1811, the main device once allocates the control channel frequency to the wireless terminal, and the LCC of the control channel frequency registered as the control frequency of the wireless terminal.
In the HT, thereafter, the wireless terminal ID of the wireless terminal using the control channel is put in the wireless terminal identification number area of the control channel availability information, and intermittent transmission is started to the wireless terminal.

Control Channel Free / Busy Information Notification Operation When Wireless Terminal Power is ON (Setting Mode) The operation when the wireless terminal 3 is powered ON (setting mode) will be described below with reference to the operation sequence of FIG. 17 and the flowchart of FIG. . In the present embodiment, the wireless terminal first tries to receive the control channel availability information of the PCF frame at a certain frequency, and if it can be received, the availability of the control channel availability information depends on the content (air availability information). The sequence is to judge.

First, when the power switch of the main body of the wireless terminal 3 is turned on together with a predetermined special operation (for example, while pressing a plurality of keys), the wireless terminal 3 enters the setting mode and S19.
At 01, initialization processing of the main body (EEPROM erasing method or the like) is performed. Subsequently, in S1902, the operator inputs the wireless terminal ID of the wireless terminal 3 from the key matrix,
The wireless terminal 3 stores this wireless terminal ID in the RAM 404.

Next, in step S1903, the CPU 401 of the wireless terminal 3 specifies the frequency for receiving the PCF frame in order to receive the control channel availability information of the PCF frame from the main device 1 (connection device 2). In step S1904, an attempt is made to receive control channel availability information of the PCF frame. S19
If the PCF frame cannot be received at 04, or if the control channel availability information of the LCCHT cannot be received within a predetermined time even if the PCF frame can be received, S1903.
Then, the reception is tried at the next frequency designated by the CPU. In step S1904, the main device 1 (connecting device 2) switches to PCF
If the frame can be received and the control channel availability information of the LCCHT can be received based on the determination based on the reception of the control channel availability information command, the system ID in the control channel availability information is stored in the EEPROM 403 in step S1905.
The connected device ID and hopping pattern are stored in the RAM 40.
Store in 4. Subsequently, in S1906, the parameter (wireless terminal identification number) of the control channel availability information is analyzed,
If the control channel is blocked, the process advances to step S1907, and the wireless terminal 3 sends to the main device the LCCHR of the idle control channel frequency in order to acquire the idle control channel.
Accordingly, the wireless terminal ID notification including the system ID, the connection device ID, and the wireless terminal ID is transmitted. On the other hand, S1
At 90, the LCCHT of the control channel frequency from the main device
System ID, connection device ID, wireless terminal ID,
Upon receiving the ID registration instruction including the control channel frequency, S1
If the wireless terminal ID in the ID registration instruction received in 908 matches the wireless terminal ID stored in the RAM 404, it is determined that the allocation of the control channel frequency has been accepted, the wireless terminal ID is stored in the EEPROM 403, and The control channel frequency is stored in RAM 404. Next, in S190, the ID registration confirmation is transmitted to the main device by the LCCHR of the control channel frequency for the confirmation notification of the ID registration instruction. If the ID registration instruction cannot be received in S1908, or if the wireless terminal ID in the ID registration instruction does not match the wireless terminal ID stored in the RAM 404 even if it is received, the allocation of the control channel frequency is recognized. If not, the process returns to step S1903, and the CPU 401 specifies the next frequency.

After transmitting the ID registration confirmation, the setting mode is shifted to the normal mode, and the main unit 1 (connecting unit 2) is sent in S1910.
Starts intermittent reception on the control channel specified by.
After that, when a calling operation or the like is performed in S1912, the intermittent reception is stopped, and an outside line calling request is notified by the control channel (LCCHR).

2.3. Wireless terminal power ON (normal mode)
FIG. 20 is an operation sequence diagram when the wireless terminal power supply is ON (normal mode) according to the present description.

FIG. 21 shows that the wireless terminal power supply related to the present description is turned on.
It is an operation | movement flowchart at the time of (normal mode).

Control Channel Free / Busy Information Notification Operation When Wireless Terminal Power is ON (Normal Mode) The operation when the wireless terminal 3 is powered ON (normal mode) will be described below with reference to the operation sequence of FIG. 20 and the flowchart of FIG. . In the present embodiment, the wireless terminal first tries to receive the control channel availability information of the PCF frame at a certain frequency, and if it can be received, the availability of the control channel availability information depends on the content (air availability information). The sequence is to judge.

First, when the power switch of the main body of the wireless terminal 3 is turned on normally, the wireless terminal 3 enters the normal mode and S2
At 101, initialization processing of the main body (check of system ID, wireless terminal ID stored in EEPROM, etc.) is performed. When the initialization process of S2101 is NG (System I
D, if there is no wireless terminal ID, or if it is improper, etc., stop the process (display the message to the user such as "No system ID""Please turn on the power in setting mode". ). If the initialization processing is OK in S2101, the process proceeds to S2102, and the control channel availability information of the PCF frame from the main device 1 (connecting device 2) is received. Therefore, the CPU 401 of the wireless terminal 3 determines the frequency for receiving the PCF frame. specify. In step S2103, reception of control channel free / busy information of the PCF frame is tried. If the PCF frame cannot be received in S2103, or if the control channel availability information of the LCCHT cannot be received even though the PCF frame can be received, the process returns to S2102, and reception is attempted at the next frequency designated by the CPU. In S2103, the PCF frame can be received from the main device 1 (connecting device 2),
If the control channel availability information of the LCCHT can be received by the determination based on the reception of the control channel availability information command, the system ID in the control channel availability information matches the system ID stored in the EEPROM 403 in step S2104. The connection device ID and the hopping pattern are stored in the RAM 404 while checking whether or not to do so. Subsequently, in S2105, the parameter of the control channel availability information (a wireless terminal identification number or an availability state identification number) is analyzed, and if the control channel is available, S2106.
In order to acquire the received idle control channel, the wireless terminal 3 transmits a wireless terminal ID notification including a system ID, a connection device ID, and a wireless terminal ID to the main device by LCCHR of the idle control channel frequency. . On the other hand, in S2107, the ID registration instruction including the system ID, the connection device ID, the wireless terminal ID, and the control channel frequency is received from the main device by the LCCHT of the control channel frequency, and in the ID registration instruction received in S2107. If the wireless terminal ID matches the wireless terminal ID stored in the EEPROM 403, it means that the control channel frequency is assigned, and the control channel frequency is stored in the RAM 404 in step S2108. Next, in S2109,
To confirm the ID registration instruction, the ID registration confirmation is transmitted to the main device using the LCCHR of the control channel frequency. If the ID registration instruction cannot be received in S2107, or if the wireless terminal ID in the ID registration instruction does not match the wireless terminal ID stored in the RAM 404 even if it is received, allocation of the control channel frequency is recognized. No, it returns to S2102, and the CPU 401
Specifies the next frequency.

After the ID registration confirmation transmission, the intermittent reception is started in the control channel designated by the main device 1 (connection device 2) in S2110. After that, when a transmission operation or the like is performed in S2111, the intermittent reception is stopped and the control channel (LCCH
R) notifies the outside line transmission request.

In the above description, the control channel is either vacant or blocked. However, after receiving the ID notification from the wireless terminal, the ID registration instruction is transmitted and the ID registration confirmation is received. Or during a specific application,
When it is necessary to secure the control channel or to restrict the acquisition of the control channel, an identification number indicating "reserved" may be transmitted as the content of the control channel availability information.

As described above, by providing a means for notifying the wireless terminals of the control channel being occupied or blocked, it becomes possible to share one control channel between the wireless terminals and use them. It is possible to prevent channel contention, and a wireless terminal requesting the establishment of a wireless link can grasp which control channel is vacant, and perform unnecessary operation such as trying to acquire a control channel that is already blocked. There is a great effect that it can be prevented, the control channel acquisition control can be made efficient, and the time until the wireless link is connected can be shortened.

(Second Embodiment) The second embodiment will be described below.

The second embodiment is the same as the first embodiment in the structure of the apparatus of each part, and therefore the description thereof is omitted.

In this embodiment, the main device (connecting device)
In the LCCHT of each control channel frequency, the control channel regularly transmits control channel availability information indicating the availability information of the control channel (LCCH) in the format shown in FIG.

In FIG. 22, the layer 2 ID is the ID of the connection device and the ID of the wireless terminal. LNG is the transmission data length, which is the length from CNT to the end of I. C
NT is control information indicating a frame type, a transmission sequence number, and a reception sequence number. I is an information frame, in which various information to be described later is stored.

The CMD / EVT of layer 3 is a command or event code.

PAR is a parameter associated with CMD / EVT. CSM is a checksum obtained by adding from CMD / EVT to the end of PAR.

The control channel free / busy information is put on the I (information frame) part of the logical control channel LCCHT, and as shown in the figure, the control channel free / busy information is the control channel free / busy information command as the CMD / EVT part. The PAR (parameter) section is composed of a system ID, a connection device ID, a free / busy information identification number, and a hopping pattern.

The wireless terminal ID is "00000000",
Except for "11111111", the required number is used from "00000001", and the free / busy state identification number area of the control channel free / busy information of FIG. 22 consists of 2 bits, and the control channel is closed in this area. If
When the state identification number "01", which indicates that the control channel is blocked, and when the control channel is free, "00", which is the state identification number, indicates when the control channel is reserved "11", which is the state identification number indicating "reserved", is transmitted as data to the connection device.

The operations of the other main device (connecting device) and the wireless terminal are the same as those in the first embodiment, and the description thereof will be omitted.

As described above, the control channel availability information transmitted on each control channel is composed of the state identification number indicating the presence / absence of the wireless terminal assigned to the control channel. It is possible to notify the empty / closed information with a smaller amount of information than the form.

(Third Embodiment) In the first and second embodiments, the main device (connecting device) uses the control channel of each hopping frequency as the control channel availability information notification. In the present embodiment, the main device is configured to transmit the air-blocking information indicating whether (LCCH) is assigned to the wireless terminal as a control channel in the LCCHT of the frequency. L of control channel frequency
In CCHT, all control channels (LCC
It is assumed that the control channel free / busy information indicating the free / busy information of H) is transmitted.

The hardware configuration of each part and the basic operation procedure of this embodiment are the same as those of the first embodiment, and therefore their explanations are omitted. The radio frame is basically the same as the frame configuration of FIGS. 8 to 13, but it is necessary to increase the number of bits of the LCCH.

FIG. 23 shows the format of the control channel free / busy information of this embodiment. The control channel availability information is placed on the I (information frame) part of the logical control channel LCCHT, and as shown in the figure, the control channel availability information is CM.
As a D / EVT part, a control channel availability information command, P
The AR (parameter) section includes a system ID, a connection device ID, a wireless terminal identification number of all control channels, and a hopping pattern.

The wireless terminal ID is "00000000",
Except for "11111111", the required number is used from "00000001", and the control channel availability information in FIG. 23 includes the wireless terminal identification number areas of all control channels from control channel 1 to control channel 20. , The wireless terminal identification number area of each control channel consisting of 8 bits has a special value indicating the wireless terminal ID to which the control channel is assigned when the control channel is blocked, and the vacancy when the control channel is vacant. The wireless terminal identification number "00000000", and the special wireless terminal identification number "11111111" indicating that reservation has been made when the control channel is reserved, shall be transmitted as data from the connection device. .

That is, each wireless terminal can know the availability information of all control channels used in the system, and can also know the wireless terminal ID of the wireless terminal using the control channel.

In this embodiment, when the power of the main unit is turned on, the control channel frequency used by the wireless terminal is RA.
It is stored in M203 (or RAM304) (S in FIG. 18).
Up to 1810), it is the same as in the first embodiment. However, when performing the intermittent transmission to the wireless terminal, the main device transmits all the control channel free / busy information as in the format of FIG.

24 and 25, the main unit (connecting unit) power supply in the present embodiment in which the main unit notifies the control channel free / busy information including the wireless terminal identification number or the free / busy state identification number 6 is an operation flowchart when the wireless terminal power is ON and the wireless terminal power is ON (setting mode), and when the wireless terminal power is ON (normal mode).

The operation of this embodiment will be described below with reference to FIGS. 24 and 25 only for the portions different from the first embodiment.

Control Channel Free / Busy Information Notification Operation When Main Device (Connecting Device) Power is ON and Wireless Terminal Power is ON (Setting Mode) In the present embodiment, the main device hops to each P.
In the LCCHT of the CF frame, control channel availability information indicating the availability of all control channels is periodically transmitted, and the wireless terminal first receives the control channel availability information of the PCF frame at a certain frequency. If it can be received, it stores the contents (all control channel free / busy information),
The sequence is such that it is determined whether or not an available control channel can be selected, and if it is possible, one of the available control channels is selected.

First, when the power switch of the main body of the wireless terminal 3 is turned on together with a predetermined special operation (for example, while pressing a plurality of keys), the wireless terminal 3 enters the setting mode and S24.
At 01, initialization processing (EEPROM erase, etc.) of the main body is performed. In step S2402, the operator selects the wireless terminal 3 from the keymat.
The wireless terminal 3 stores the wireless terminal ID in the RAM 404 by performing the input operation of the wireless terminal ID.

In step S2403, the control channel availability information of the PCF frame from the main unit 1 (connector 2) is received, so that the CPU 401 of the wireless terminal 3 specifies the frequency for receiving the PCF frame. In step S2404, reception of control channel free / busy information of the PCF frame is tried. If the PCF frame cannot be received in S2404, or if the control channel availability information of LCCHT cannot be received within a predetermined time even if the PCF frame can be received, the process returns to S2403, and the next frequency designated by the CPU is received. Try. If the PCF frame can be received from the main device 1 (connection device 2) in S2404 and the control channel availability information of the LCCHT can be received based on the determination based on the reception of the control channel availability information command, in S2405, the control channel EEPROM403 the system ID in the air block information
Further, the connection device ID, the free / busy information of all control channels, and the hopping pattern are stored in the RAM 404. S240
In step 6, the parameter of the control channel availability information (wireless terminal identification number or availability information identification number) is analyzed, and if all the control channels are occupied, the processing is interrupted (control for the user is performed). Issue a message such as channel acquisition failure). If even one control channel is free in S2406, one of the free control channels is selected in S2407, and the process proceeds to S2408.

In step S2408, the wireless terminal 3 transmits a wireless terminal ID notification including the system ID, the connection device ID, and the wireless terminal ID to the main unit 1 by the LCCHR of the empty control channel frequency in order to acquire the empty control channel. To do. Then, in step S2409, the system ID, the connection device ID, the wireless terminal ID, and the control channel frequency ID are obtained from the main device 1 using the LCCHT of the control channel frequency.
When the registration instruction is received, if the wireless terminal ID in the ID registration instruction received in S2410 matches the wireless terminal ID stored in the RAM 404, it is determined that the control channel frequency has been assigned, and the wireless terminal ID is EEP.
The control channel frequency is stored in the ROM 403 and the RAM 404. Next, in S2411, ID
To confirm the registration instruction, the ID registration confirmation is transmitted to the main device 1 by the LCCHR of the control channel frequency. Also, if the ID registration instruction could not be received in S2409, or if the ID registration instruction received, the wireless terminal ID in the ID registration instruction is R.
If the wireless terminal ID stored in the AM 404 does not match, it is determined that the control channel frequency has not been assigned, the process returns to S2406, and the CPU 401 selects another control channel frequency. After transmitting the ID registration confirmation, the mode is changed from the setting mode to the normal mode, and intermittent reception is started on the control channel designated by the main device 1 (connection device 2) in S2412. After that, when a transmission operation is performed in S2413, the intermittent reception is stopped and the control channel (LC
CHR) will notify the outside line call request.

Control channel availability information notification operation when wireless terminal power is ON (normal mode) FIG. 25 is an operation flowchart when the wireless terminal power is ON (normal mode) according to the present embodiment.

In FIG. 25, when the power switch of the main body of the wireless terminal 3 is normally turned on, the wireless terminal 3 enters the normal mode, and in S2501, the initialization processing of the main body (system ID and wireless terminal ID stored in the EEPROM is checked). Etc.). If the initialization processing of S2501 is NG (system ID, wireless terminal ID does not exist or is improper), the processing is stopped. For the user, a message such as "No system ID" or "Turn on power in setting mode" is displayed. If the initialization processing is OK in S2501, the main device 1 (connection device 2) is processed in S2502.
In order to receive the control channel availability information of the PCF frame from, the CPU 401 of the wireless terminal 3 specifies the frequency for receiving the PCF frame, and receives the control channel availability information of the PCF frame in S2503. P in S2503
If the CF frame cannot be received, or if the control channel availability information of the LCCHT cannot be received within the predetermined time even if the PCF frame can be received, the process returns to S2502.
Attempts to receive at the next frequency specified by the CPU. S
If the 2503 can receive the PCF frame from the main device 1 (connecting device 2) and the control channel availability information of the LCCHR can be received based on the determination based on the reception of the control channel availability information command, the control channel availability information is sent in S2504. Connect the system ID in the EEPROM to the connection device I
D, free / busy information of all control channels, and hopping patterns are stored in the RAM 404. Then, in step S2505, parameters of the control channel availability information (radio terminal identification number,
Alternatively, if the control channel is completely blocked, the processing is interrupted and a message such as the control channel acquisition failure is issued to the user. S2
If there is a free control channel in 505, S2506
In step S2507, the wireless terminal 3 selects one of the idle control channels by using the LCHHR of the idle control channel frequency to the main device 1 in order to acquire the idle control channel.
The wireless terminal ID notification including the system ID, the connection device ID, and the wireless terminal ID is transmitted. Next, in S2508, the main device 1
When the ID registration instruction including the system ID, the connection device ID, the wireless terminal ID, and the control channel frequency is received from the LCHHT of the control channel frequency, the wireless terminal ID in the ID registration instruction received in S2509 is the RAM4.
When it matches the wireless terminal ID stored in 04, it is determined that the allocation of the control channel frequency is recognized, and the control channel frequency is stored in the RAM 404.

Next, in S2410, a confirmation notification for the ID registration instruction is sent, so that the main unit 1 receives L of the control channel frequency.
ID registration confirmation is sent by CCHR. Also, S2
If the ID registration instruction cannot be received at 508, or if the wireless terminal ID in the ID registration instruction does not match the wireless terminal ID stored in the RAM 404 even if it is received, it is determined that the allocation of the control channel frequency is not permitted. Then S
Returning to 2505, the CPU 401 selects another control channel frequency. After transmitting the ID registration confirmation, intermittent reception is started at the control channel frequency designated by the main device 1 (connecting device 2) in S2511. After that, when a call origination operation is performed in S2512, the intermittent reception is stopped, and the outside line call origination request is notified by the control channel (LCCHR).

(Fourth Embodiment) The hardware configuration of each part and the basic operation procedure of this embodiment are the same as those of the first to third embodiments, and therefore the description thereof is omitted.

FIG. 26 shows the format of the control channel free / busy information of this embodiment. The control channel availability information is placed on the I (information frame) part of the logical control channel LCCHT, and as shown in the figure, the control channel availability information is CM.
As a D / EVT part, a control channel availability information command, P
The RA (parameter) section includes a system ID, a connection device ID, a free / busy state identification number of all control channels, and a hopping pattern.

The control channel free / busy information in FIG. 26 includes free / busy state identification number areas of all control channels from control channel 1 to control channel 20, and has 2-bit free / busy state identification of each control channel. In the number area, if the control channel is blocked, the state identification number "01" indicating that the control channel is blocked,
If the control channel is free, the state identification number "00", which indicates that the control channel is free, and when the control channel is reserved, "11", which is the state identification number that indicates reserved,
Is transmitted from the connection device as data.

In this embodiment, as in the third embodiment, by transmitting the air-blocking information of all control channels on each control channel, the wireless terminal can determine which control channel is being received. Also has the great effect that the control channel acquisition control can be efficiently performed because it is possible to grasp the free / closed state of all control channels.

The empty / busy information of all control channels to be transmitted on each of the control channels is composed of a status identification number indicating the presence / absence of a wireless terminal assigned to the control channel. It is possible to efficiently notify the air-tightness information with a small amount of data representing the number.

As described above, according to the present invention, by notifying the radio terminal of the control channel availability information,
Control channel contention can be mitigated. Further, the wireless terminal requesting the establishment of the wireless link can grasp which control channel is available, prevent the useless operation of trying to acquire the already blocked control channel, and acquire the control channel. It is possible to improve efficiency and shorten the time until the wireless link is connected.

Further, by changing the frequency of the connection device / wireless terminal time division multiplex frame for each frame period, that is, by performing frequency hopping which is one method of spread spectrum, the interference removal capability is enhanced and confidentiality is improved. By improving and further performing frequency hopping for each frame, frame transmission / reception timing and frequency hopping timing are integrated, and the circuit / control can be simplified.

Further, in the above-mentioned first to fourth embodiments,
Although communication is performed using frequency hopping, the present invention can also be used for wireless communication that does not perform frequency hopping.

[Brief description of drawings]

FIG. 1 is a system configuration diagram in which the present invention is implemented.

FIG. 2 is a configuration diagram of a main device in a system implementing the present invention.

FIG. 3 is a configuration diagram of a connection device in a system embodying the present invention.

FIG. 4 is a block diagram of a wireless dedicated telephone in the system embodying the present invention.

FIG. 5 is a configuration diagram of a wireless adapter in a system implementing the present invention.

FIG. 6 is a configuration diagram of a wireless adapter with a built-in modem in the system embodying the present invention.

FIG. 7 is a block diagram of a wireless unit in a system implementing the present invention.

FIG. 8 is a frame format used between a wireless terminal and a main device of a system implementing the present invention.

FIG. 9 is a frame format used between wireless dedicated telephones of the system embodying the present invention.

FIG. 10 is a frame format used between data terminals of a system implementing the present invention.

FIG. 11 is a configuration diagram of a CNT-T of a frame used in the system implementing the present invention.

FIG. 12 is a configuration diagram of a communication channel of a frame used in the system implementing the present invention.

FIG. 13 is a configuration diagram of a CNT-R of a frame used in the system implementing the present invention.

FIG. 14 is a block diagram of a channel codec used in a system implementing the present invention.

FIG. 15 is a conceptual diagram of a frequency hopping method used in a system implementing the present invention.

FIG. 16 is a format of control channel free / busy information used in the first embodiment.

FIG. 17 is a sequence chart when the main device power supply and the wireless terminal power supply of the first embodiment are turned on.

FIG. 18 is an operation flowchart when the main device according to the first embodiment is ON.

FIG. 19 is an operation flowchart when the wireless terminal is powered on (setting mode) according to the first embodiment.

FIG. 20 is an operation sequence chart when the wireless terminal is powered on (normal mode) according to the first embodiment.

FIG. 21 is an operation flowchart when the wireless terminal is powered on (normal mode) according to the first embodiment.

FIG. 22 is a control channel free / busy information format used in the second embodiment.

FIG. 23 is a control channel free / busy information format used in the third embodiment.

FIG. 24 is an operation flowchart when the wireless terminal is powered on (setting mode) according to the third embodiment.

FIG. 25 is an operation flowchart when the wireless terminal is powered on (normal mode) according to the third embodiment.

FIG. 26 is a control channel free / busy information format used in the fourth embodiment.

FIG. 27 is a main device configuration diagram of a conventional wireless switching system.

FIG. 28 is a connection device configuration diagram of a conventional wireless switching system.

FIG. 29 is a configuration diagram of a wireless-only telephone of a conventional wireless exchange system.

FIG. 30 is a transmission sequence chart of a conventional wireless switching system.

[Explanation of symbols]

 ID ID of connection device and ID of wireless terminal LNG Transmission data length CNT Frame control information I Information frame CMD / EVT Command / event code PAR CMD / EVT parameter CSM checksum

Claims (19)

[Claims] 1. A wireless switching device for exchanging at least one wireless communication terminal, establishing means for establishing a wireless communication path with the wireless communication terminal, and storage for storing availability information indicating whether or not a control channel is used. A wireless switching device comprising: a means and a transmitting means for transmitting the air-tightness information stored in the storage means to the wireless communication terminal. 2. The wireless switching device according to claim 1, wherein the transmitting means transmits the air-blocking information using the control channel. 3. The wireless communication device according to claim 1, wherein the transmitting means is at least 1 used by the wireless switching device.
A wireless switching device which transmits air-blocking information of two control channels. 4. The transmission device according to claim 1, wherein, when the control channel is being used, the transmitting unit transmits the availability information by using an identification number of a wireless communication terminal using the control channel. A wireless switching device. 5. The wireless switching device according to claim 1, wherein the availability information indicates the presence / absence of a wireless terminal that uses the control channel. 6. The wireless switching device according to claim 1, wherein the wireless switching device performs communication by a spread spectrum method. 7. In a wireless communication device, receiving means for receiving air-closing information indicating whether or not a control channel is used, analyzing means for analyzing the air-closing information, and communication availability according to an analysis result of the analyzing means. A wireless communication device having an establishing means for establishing a wireless communication path with the device. 8. The receiving unit according to claim 7, wherein the receiving / receiving unit receives the air-closing information on a control channel, and the analyzing unit analyzes the air-closing information on at least one control channel receivable by the receiving unit. A wireless communication device characterized by performing. 9. The establishment means according to claim 8, wherein the establishment means establishes a wireless communication path by using another control channel when it is determined that the control channel received by the analysis result of the analysis means is in use. A wireless communication device. 10. The wireless communication device according to claim 7, wherein the wireless communication device performs communication by a spread spectrum method. 11. A wireless switching system comprising at least one wireless communication terminal and a wireless switching apparatus for switching the wireless communication terminal, wherein the wireless switching apparatus establishes a wireless communication path with the wireless communication terminal. Establishing means, storage means for storing the air-and-bust information indicating whether or not a control channel is used, and transmission means for transmitting the air-and-bust information stored in the storage means to the wireless communication terminal. The terminal is a receiving unit that receives the air-closing information transmitted from the transmitting unit, an analyzing unit that analyzes the air-closing information, and a wireless communication device and a wireless communication path according to the analysis result of the analyzing unit. A wireless switching system having a second establishing means for establishing. 12. The wireless switching system according to claim 11, wherein the transmitting unit transmits the air-blocking information using a control channel, and the receiving unit receives the control channel. 13. The wireless switching system according to claim 11, wherein the transmitting unit transmits the availability information of at least one control channel used by the wireless switching system. 14. The transmitting means according to claim 11, wherein, when the control channel is used, the transmitting means transmits the availability information by using an identification number of a wireless communication terminal using the control channel. Then, the analyzing unit analyzes the identification number of the air-tightness information received by the receiving unit, and the second establishing unit establishes a wireless communication path by using a control channel without the identification number. A featured wireless switching system. 15. The air-filling information according to claim 11, wherein the transmitting unit transmits air-filling information indicating presence / absence of a wireless communication terminal that uses the control channel, and the analyzing unit receives the air-filling information received by the receiving unit. The presence or absence of the wireless communication terminal is analyzed, and the second establishing unit establishes a wireless communication path by using a control channel that is not used by the wireless communication terminal. 16. The wireless switching system according to claim 11, wherein the wireless communication terminal performs communication using a spread spectrum method. 17. The wireless communication method according to claim 1, further comprising storing empty / busy information indicating whether or not a control channel is used, and transmitting the stored empty / busy information. 18. In the wireless communication method, when receiving the air-blocking information indicating whether or not the control channel is used, the air-blocking information is analyzed, and a wireless communication path is established with a communication partner device according to the analysis result. A characteristic wireless communication method. 19. In the wireless communication method, a wireless communication device transmits air-blocking information indicating the presence or absence of a control channel to a communication partner device, and when the communication partner device receives the air-blocking information, the wireless communication device analyzes the air-blocking information. Then, the wireless communication method is characterized in that a wireless communication path is established with the wireless communication device according to the analysis result.