JPH09261715A - Frequency hopping pattern assignment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide A frequency hopping pattern assignment system in which confusion due to duplicate hopping patterns or the like is prevented. SOLUTION: A central control terminal equipment managing a hopping pattern is provided in a radio communication system conducting radio communication by the frequency hopping, and prior to start of communication of a radio communication terminal equipment to other radio communication terminal equipment, the radio communication terminal equipment having a communication request reports an acquisition request of a hopping pattern not in use at present to the central control terminal equipment. The central control terminal equipment receiving the acquisition request of the hopping pattern retrieves a hopping pattern not in use in a hopping pattern table managed by its own terminal equipment and it is reported the radio communication terminal equipment sending the hopping pattern acquisition request and the hopping pattern is made busy and it is registered in the hopping pattern table.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hopping pattern allocation system for performing spread spectrum communication by a frequency hopping system.

[0002]

2. Description of the Related Art In recent years, a spread spectrum communication system has attracted attention as one of digital wireless communication systems. In particular, the spread spectrum method using the frequency hopping method has come to be often used because its configuration can be realized relatively easily.

In spread spectrum communication by this frequency hopping method, a plurality of hopping patterns are defined so that the same frequency is not used at the same time, and each wireless communication terminal communicates according to one of these hopping patterns. By performing this, a plurality of wireless communication terminals can simultaneously perform communication with high throughput.

[0004]

However, in the above-mentioned conventional example, when the hopping pattern used by each wireless communication terminal is not managed, the hopping pattern used by each terminal is duplicated. As a result, interference occurs and communication efficiency decreases. Therefore, a method of managing the hopping pattern to be used is required so that such a problem does not occur.

An object of the present invention is to provide a frequency hopping pattern allocation method capable of preventing confusion due to duplication of hopping patterns.

[0006]

According to the present invention, a centralized control terminal for managing a hopping pattern is provided in a wireless communication system for performing wireless communication by frequency hopping, and one wireless communication terminal communicates with another wireless communication terminal. Prior to starting communication, the wireless communication terminal that has generated the communication request has means for notifying the centralized control terminal of the acquisition request of the currently unused hopping pattern, and receives the acquisition request of the hopping pattern. The centralized control terminal searches for an unused hopping pattern in the hopping pattern table managed by itself and notifies the wireless communication terminal which issued the hopping pattern acquisition request of the unused hopping pattern and the hopping pattern being used. And means for registering in the hopping pattern table.

Further, when the wireless communication terminal ends its intended communication, means for notifying the centralized control terminal of the release request of the hopping pattern used for communication, and the release request of the hopping pattern. The centralized control terminal having received the means has means for registering the hopping pattern requested to be released in the hopping pattern table as unused.

With the above configuration, the centralized control station can manage the hopping pattern used in the system and can allocate the hopping pattern used for communication to each wireless communication terminal without duplication.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram showing the configuration of a wireless communication system used in an embodiment of the present invention.

In this wireless communication system, a centralized control station for managing and controlling the communication of wireless communication terminals accommodated in the system is provided, and each terminal station uses a wireless frame described later to perform control transmitted from the centralized control station. Wireless communication shall be performed according to the data. Further, the terminal station that can be the centralized control station is at least any one of the terminal stations in the system.

The individual terminals constituting the system will be described in detail below.

This wireless communication system accommodates a public line 102 and controls data between a network control device 101 for providing a public network communication service to a terminal station in the system and a central control station or another terminal station. A wireless telephone 103 for exchanging voice data, performing a voice call via the public line 102, and performing a so-called extension call between a plurality of terminal stations,
Wireless data terminals 104 to 10 for performing control data communication and data communication with a centralized control station or another terminal station
9.

Hereinafter, the terminal stations of the wireless telephone and the wireless data terminal will be collectively referred to as wireless terminals 110 (generic numbers from 103 to 109).

The wireless data terminal 104 is a terminal device (data terminal) having a function of transmitting and receiving data in a burst or a data input / output device and a wireless adapter for controlling wireless communication, or they are integrated. Computer 104, multimedia terminal 105, printer 10 shown in the figure, for example.
6, the facsimile 107, the copying machine 108, the LAN gateway 109, as well as devices such as an electronic camera, a video camera, and a scanner.

A major feature of this wireless communication system is that these wireless telephones 103 and wireless data terminals 104 can freely communicate with each other and can access the public network 102 at the same time. is there.

The detailed configuration and operation will be described below. (1) Wireless Telephone FIG. 2 is a block diagram showing the internal configuration of the wireless telephone 103.

The main control unit 201 controls the entire radio telephone 103, and the memory 202 includes the main control unit 2.
No. 01 control program is stored, a calling code (system ID) of the present wireless communication system, an EEPROM for storing a sub-ID of the wireless telephone, a RAM serving as a work area for controlling the main control unit 201, and the like. It is something.

The call path unit 203 includes an input / output block for the handset 208, the microphone 209, and the speaker 210, and the ADPC.
The M codec 204 is interfaced. The ADPCM codec 204 converts the analog voice information from the communication path unit 203 into an ADPCM code and the ADPCM coded information into analog voice information.

The channel codec unit 205 uses the ADPC.
The M-coded information is subjected to scrambling and the like and time-division multiplexed into a predetermined frame. The data assembled into the radio frame in the channel codec unit 205 is transmitted to the main device or the target terminal station via the radio unit.

The radio control unit 206 has a function of performing transmission / reception switching of the radio unit 207, frequency change, carrier detection, level detection, bit synchronization and the like. Radio unit 207
Is for modulating the digital information from the frame processing unit 205 and converting it into a format capable of wireless transmission and sending it to the antenna, and demodulating the information wirelessly received from the antenna and converting it into digital information.

The handset 208 is for inputting and outputting a call voice signal for a call, and the microphone 209 is for collecting and inputting a voice signal for a loud call. The speaker 210 outputs a voice signal in a loud voice, and the display unit 212 displays a dial number input from the key matrix 211, a usage status of a public line, and the like.

The key matrix 211 is a key input device 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. (2) Wireless Adapter FIG. 3 is a block diagram showing an internal configuration of a wireless adapter connected to or built in the wireless data terminals 104 to 109.

In the figure, the data terminal / peripheral device 30
Reference numeral 1 denotes various data terminals represented by a computer, various peripheral devices represented by a printer, and a facsimile.

The wireless adapter 302 is a wireless adapter that can be connected to a data terminal or a peripheral device via a communication cable or an internal bus.

The radio section 303 is a CP in the main control section 304.
Under the control of U, the framed digital signal from the channel codec unit 308 is modulated to wirelessly transmit data, and the signal wirelessly received from the antenna is demodulated and processed into a framed digital signal. is there.

The main control unit 304 is composed of a CPU, peripheral devices for performing interrupt control and DMA control, an oscillator for a system clock, etc., and controls each block in the wireless adapter.

The memory 305 comprises a ROM for storing programs used by the main control unit 304, a RAM used as a buffer area for various processes, and the like.

The communication interface unit 306 is a communication interface such as RS232C, Centronics, or Ethernet equipped in the data terminal or the peripheral device 301 as described above, or an internal bus such as an ISA bus of a personal computer or a workstation or a PCMCIA interface. Wireless adapter using
02 controls the communication.

The timer 307 provides timing information used by each block inside the wireless adapter.

The channel codec section 308 not only assembles and disassembles the radio frame as shown in FIG.
Simple error detection processing represented by CRC, scramble processing, control of the radio unit 303, and the like are performed.

The radio control section 309 controls the transmission / reception switching, frequency switching, etc. of the radio section 303, and also has the functions of carrier detection, level detection, and bit synchronization.

The error correction processing unit 310 is used to detect or correct a bit or byte error that occurs in communication data due to various wireless environments. At the time of transmission, an error correction code is inserted in the communication data to add redundancy to the data, and at the time of reception, the bit error occurred in the received data is calculated by calculating the position of the error and the error pattern by arithmetic processing. correct. (3) Network Control Device FIG. 4 is a block diagram showing the internal configuration of the network control device 101.

The main controller 401 controls the network control device 101 as a whole. The memory 402 includes a ROM that stores a program and a calling code (system ID) of the wireless communication system, and a RAM that stores various data for controlling the main control unit 401 and provides a work area for various calculations. Composed.

The line interface unit 403 performs power supply for accommodating the public network line 102, transmission of a selection command, DC loop closure, public network line control such as PCM conversion, selection command reception, and call command transmission. .

The ADPCM codec unit 404 converts the analog audio signal received by the line interface unit 403 via the public network 102 into an ADPCM code, transfers the ADPCM code to the channel codec unit 405, and performs ADPCM coding from the channel codec unit 405. The converted audio signal is converted into an analog audio signal.

The channel codec section 405 uses the ADPC.
The M-encoded information is subjected to scrambling and the like and time-division multiplexed into a predetermined frame.
The data assembled into a radio frame by the channel codec unit 405 is transmitted to the centralized control station or the target radio terminal 110 via the radio unit.

The radio control unit 406 has a function of controlling transmission / reception switching, frequency switching, etc. of the radio unit 407, and also carrying out carrier detection, level detection, and bit synchronization.

The radio section 407 includes a channel codec section 4
The framed information from 05 is modulated and converted into a format capable of wireless transmission and sent to the antenna, and the information wirelessly received from the antenna is demodulated and processed into digital information.

The detecting unit 408 detects an incoming call, a loop,
Various tones such as a PB signal, a dial tone, and a ring tone are transmitted. (Wireless Frame) FIG. 5 is an explanatory diagram showing a channel configuration inside a frame used in this embodiment.

In the figure, CNT indicates a system control channel and LCCH indicates a logical control channel. Two voice channels and data channels are used for bidirectional voice and data exchange, and END indicates a guard time until the frequency change is completed for frequency hopping in the next frame. ing.

FIG. 6 is an explanatory diagram showing an example of the internal structure of each channel in this embodiment. In the figure, CS is 1
The carrier sense time is 2.8 μsec, and R is the ramp bit for 6.4 μsec. Also,
PR indicates a 56-bit preamble for bit synchronization acquisition, and SYN indicates a frame synchronization signal in which 1 dummy bit is added to 31 bits defined by RCR.

The ID is a 63-bit calling signal defined by RCR, with one dummy bit added,
UW indicates a 24-bit unique word (for capturing byte synchronization). Further, BF indicates 8-bit basic frame number information (1 to 20 cycles), and WA indicates a field in which the system address of the terminal station to be activated among the terminals in the sleep mode is entered.

Further, NF indicates frequency information used in the next frame, and Rev indicates an area number for distinguishing from adjacent cells. GT is a guard time and CS0, CS1, and CS2 are carrier sense times. DA is a field for entering a system address, and CRC of the system control channel is BF to Re.
CRC information up to v. Further, Data is a field for writing data to be transmitted, and CRC of the logical control channel is CRC information for Data.

The CRC of the voice channel is the C of T / R.
It is RC information, and CF is a guard time for frequency switching. Further, T / R indicates B channel information of 32 kbps. The numbers shown in the figure represent the number of bits, and show an example of the number of bits in each part.

The CNT channel is transmitted by the central control station at the start of every frame, and stations other than the central control station always receive the CNT channel in order to establish bit synchronization and frame synchronization.

The LCCH channel is used for connecting and disconnecting a line, exchanging a hopping pattern allocation request with the central control station prior to the line connection, and exchanging a hopping pattern allocation release with the central control station when the line is disconnected. To do. LCCH connection and disconnection
In the DA field provided in the channel, the system address of the other party with whom communication is desired is entered, and the other party directly communicates.

One of the two voice channels is used for transmission and the other is used for reception to realize a full-duplex voice communication. Which of the two channels is to be used for transmission is determined by having a meeting with the communication partner terminal on the LCCH channel that is exchanged at the time of line connection.

The data channel is an LCCH channel that is exchanged at the time of line connection, and determines how to perform data transmission by having a meeting with a communication partner terminal. (Frequency Hopping) FIG. 7 is an explanatory diagram showing an example of frequency hopping.

The horizontal axis represents time, and the vertical axis represents frequency. A time frame divided into certain intervals is called a base frame (BF). In the figure, a system having eight BFs and eight frequencies F1 to F8 is used as an example.

Further, the hopping pattern (HP) in which the centralized control station transmits the system control channel in the figure is the first HP in FIG. That is, when BF1, F1, BF2
The frequency is changed for each BF, such as F2 when, BF3 when F3, and so on. Furthermore, the first HP of the figure
In the second HP, terminal A and terminal B perform voice communication.
In the third HP, terminal C and terminal D perform voice communication in
In, it is assumed that the terminal A and the terminal B are performing data communication.

As described above, the HPs do not use the same frequency in the same BF, but always use different frequencies.
Further, one frame shown in FIG. 5 exists in 1BF, and the frequency is changed in a determined order (HP) after one frame is transmitted, that is, every time 1BF is completed.

The example shown in FIG. 8 shows in detail the state of frequency hopping of terminals A and B. Hereinafter, how to perform frequency hopping in this system will be described with reference to the drawings.

As shown in FIG. 8, all wireless terminals 110 other than the centralized control station first set the frequency to be set in the wireless section in BF1 in order to receive the system control channel transmitted by the centralized control station. HP of 1 sets to the frequency F1 used by BF1. All wireless terminals other than the central control station 1
The frame 10 synchronizes with the system control channel received here.

Next, the terminal which intends to transmit the control data such as the communication line connection or the communication line disconnection directly transmits the control data to the partner terminal on the logical control channel of the same frequency (HP) as the system control channel.

A terminal that has no control data to transmit intercepts control data transmitted by another terminal on the logical control channel. If the received data is not control data addressed to the terminal itself, the received control data is discarded.

When the logical control channel is terminated, the terminal in the voice or data communication moves to the frequency corresponding to the HP assigned in advance by the central control station in the voice channel and the data channel.

After the end of the data channel, during END,
In order to receive the system control channel in the next BF2, the frequency is changed to F2 which is the frequency used in BF2 in the first HP.

The procedure of frequency hopping after the base frame becomes BF2 repeats the above procedure. (Detailed Operation Description) (1) Operation of Centralized Control Station In order for this wireless communication system to operate, the centralized control station manages the hopping frequency in the system, and the terminal station uses the HP.
It is assumed that the central control station can allocate the communication channel determined by the time slot.

The central control station has the functions of changing the HP of the system, managing the intermittent reception status of the terminal stations, and registering the system of the terminal stations in addition to the management of each communication channel. The management of the communication channel, which is the basis for performing, is described.

The management of the communication channel in the centralized control station is to allocate or release an unused HP to the data type (voice or data) of the communication requested by the terminal station.

FIG. 9 is an explanatory diagram showing the HP allocation sequence. This figure illustrates a sequence from the terminal station requesting the central control station for HP to communicate with a specific communication partner station, to the end of communication and release of HP.

The terminal station sends an HP allocation request 4101 to the central control station in order to start communication with a particular communication partner station. The HP assignment request 4101 includes the ID of the communication partner station.
And parameters such as data type are included. The central control station sends an HP assignment 4102 to the terminal station if there is an unused HP of the requested data type. The terminal station sends the assigned HP to the communication partner station to make a connection request. If the connection permission is obtained from the communication partner station, the terminal station sends a connection completion notice 4103 to the centralized control station. The centralized control station confirms and manages the usage status of the HP allocated by the parameter of the connection completion notification 4103 of the terminal station, and sends a connection completion confirmation 4104 to the terminal station. After receiving the connection completion confirmation 4104, the terminal station is hereafter assigned the H assigned to the communication partner station.
Communicate with P.

When the communication is completed, the terminal station disconnects the connection with the communication partner station and then sends an HP release request 4105 to the centralized control station. The central control station changes the usage status of the assigned HP, and sends an HP release confirmation 4106 to the terminal station. Upon receiving the HP release confirmation 4106, the terminal station ends the communication.

FIG. 10 is a flowchart showing HP allocation in the centralized control station. In this figure, the terminal station is H
The processing performed on the central control station side from the request of P to the start of communication is described.

Upon receiving the HP allocation request 4201 from the terminal station, the centralized control station confirms in the HP table whether there is an unused HP of the requested data type (4202). If there is no unused HP, the terminal station is notified 4204 that there is no unused HP. If there is an unused HP, perform temporary registration 4203 in the HP table,
HP temporary allocation 4205 is performed for the terminal station.

The centralized control station confirms whether or not the terminal station has succeeded in the connection with the communication partner station (4207) on the HP temporarily assigned by the connection completion notification 4206 from the terminal station, and the connection is successful. If not, HP of temporary allocation is H
Unused registration 4209 in the P table, and if connection is successful, temporary allocation HP is registered in the HP table as used 420
8 The centralized control station sends a connection completion confirmation 4210 to the terminal station after registering the usage status in the HP table,
The requested HP allocation is ended.

FIG. 11 is a flowchart showing HP release in the centralized control station. This figure describes processing performed on the central control station side in the procedure of releasing the assigned HP after the communication has been completed at the terminal station.

The central control station requests the HP release request 4 from the terminal station.
When 301 is received, the terminal ID included in the parameter
And the HP of the release request is confirmed 4302. If the HP of the release request is not the normally assigned HP, the error notification 4304 is sent to the terminal station and the HP is not released. If the HP of the release request can be confirmed normally, the unused registration 4303 is performed in the HP table, and the HP release confirmation 4305 is sent to the terminal station.

As described above, in this system, the central control station has the HP table unique to the system, and the allocation of the communication channel of the communication performed between the terminal stations is realized by the central control station allocating the HP. The central control station manages all communications in the system.

The operation of this system will be described below by dividing it into some cases. (2) Operation when power is turned on (2.1) Operation of central control station and terminal station when power is turned on FIG. 12 is an explanation showing an operation sequence of the central control station and terminal station when the power is turned on in this system. It is a figure.

When the power is turned on and the terminal is initialized in step S5101, the terminal determines whether it is the central control station or the terminal station, and when it recognizes that it is the central control station, HP Then, the synchronization signal, HP information, own area number, etc. are assembled into a frame and output as a CNT frame at every predetermined timing. Similarly, when the terminal recognizes that it is a terminal station after the terminal is started up, it stores the address of the terminal and the area number of the centralized control station to receive. When this processing ends, the CNT frame from the centralized control station is waited at an arbitrary frequency. When the CNT frame from the central control station is received, the NF in this frame
Based on, obtain the frequency that hops to the next unit time.

The terminal station changes the reception frequency based on the received NF and waits for the next CNT frame to be sent. The terminal station repeats this process to recognize the HP used by the centralized control station and store it.

When HP storage is completed at the terminal station,
In S5102, the LCCH frame is used to notify the central control station that it will newly join as a terminal station in the system. At this time, the DA address of the LCCH frame is filled with the global address received by all terminals, and the data portion is sent with data indicating that new registration is to be performed.

The central control station receives the LCCH frame, analyzes the data in the data section when the DA section has a global address, and when there is a terminal station address and a registration request signal, based on this information. Store the terminal station address and perform new registration.

Upon completion of this registration, in step S5103, the central control station notifies the newly registered terminal station of the address of the central control station using the LCCH frame. When the terminal station receives the address of the control station in the LCCH frame, the terminal station stores the address of the control station.
At 5104, the centralized control station is notified of start-up completion using the LCCH frame. When the centralized control station receives the start-up completion notification from the terminal station, it shifts to normal processing.

At the terminal station, after the start-up completion notification is transmitted, the terminal station can make the transmission at S5105. (2.2) Operation at Power-On in Central Control Station FIG. 13 is a flowchart showing the operation at power-on in the central control station.

When the power of the terminal is turned on in S5201,
In step S5202, the terminal is initialized and put into an operating state.
As a result of this processing, when it is recognized that the terminal is the centralized control station in S5203, a processing for storing the address information and area information of the own terminal is performed in S5204.

As means for inputting area information and terminal address information, a value set by a DIP switch or the like at the time of startup is stored, or a value input by a dial key of a telephone or the like is stored. In this case, a value input by a keyboard of a computer or the like may be received via a bus and stored.

When this address information is received, S520
It is determined whether or not the value input in 5 is valid, and if it is not valid, the address information is stored again in S5204. If it is confirmed that the address stored in S5205 is valid, a process for determining the HP to be used in S5206 is performed. At this time, the centralized control station carries out carrier sensing on all available frequencies, selects a predetermined number of frequencies with the best radio wave condition among them, and determines HP.

After determining the HP in S5206, a process for assembling the CNT frame is performed in S5208. CNT
The frame is a frame including a synchronization signal ID, an area number, and frequency information. After the assembly of this CNT frame is completed, using one of the determined HPs, S521
At 0, transmission of the CNT frame is started, and the process shifts to normal processing. (2.3) Operation at the time of new terminal registration in central control station FIG. 14 is a flowchart showing the operation at the time of new terminal station registration in the central control station.

The centralized control station sends L during normal processing in S5301.
When the CCH frame is received and the address addressed to the own terminal or all terminals is entered in the DA section, the control data in the received LCCH frame is taken out and an instruction is executed.

When it is confirmed that the control data received in S5303 is a registration request from the terminal station, a confirmation process of the terminal station address transmitted together with the registration request is performed in S5304. As a result of the terminal station address confirmation, if it is detected in S5305 that the terminal station address is normal, S5306
In the centralized control station, processing for registering the terminal station address is performed, and the address information is stored.

When it is detected that the terminal station address is not normal in S5305, a process for discarding the registration request received in the LCCH frame is performed in S5310, and S5 is executed again.
At 301, normal processing is performed.

When the terminal station registration is completed in S5306,
In step S5307, the address of the centralized control station is entered in the Data section using the LCCH frame, and the address of the terminal station is entered in the DA section and transmitted to the terminal station that has completed registration.

After transmitting the central control station address in S5307, if the startup completion notification signal using the LCCH frame from the terminal station whose registration is completed in S5308 cannot be confirmed, it is detected in S5311 whether a predetermined time has elapsed.
When the predetermined time has elapsed, the LCCH is again performed in S5307.
The central control station address is notified using a frame, and the terminal waits for a response.

When the start-up completion notification signal from the terminal station is detected in S5308, new registration completion processing of the terminal station is performed in S5309, and the processing shifts to normal processing. (2.4) Operation at Power-on of Terminal Station FIG. 15 is a flowchart showing operation at power-on of the terminal station.

When the power of the terminal is turned on in S5401,
In step S5402, the terminal is initialized and put into an operating state. As a result of this processing, when it is recognized that the terminal is a terminal station in S5403, processing for storing the address information and area information of the own terminal is performed in S5404.

The terminal station, the centralized control station determining means, the area information and the terminal address information input means are used to store the value set by the DIP switch or the like at the time of start-up, or to dial a telephone or the like. A case where a value input by a key is stored, a case where a value input by a keyboard of a computer or the like is received via a bus, and stored may be considered.

Next, when the address information is read, S54
In 05, it is determined whether the input value is valid. If it is not valid, the process of storing the address information is performed again in S5404. If it is confirmed that the address stored in S5405 is valid, the HP used in S5406
Process to obtain.

At S5406, the CNT from the central control station is sent.
In order to receive a frame, it shifts to a reception standby state at an arbitrary frequency. If the CNT frame from the centralized control station can be received at that frequency, the area number is recognized from the Rev section in the CNT frame and the area number is compared with the area number stored in the own terminal.

If the area numbers match, the frequency hopping in the next unit time is acquired from the NF section in the CNT frame, and the terminal station sets the received frequency to that frequency, and then the next CNT. Wait for the frame. Then, the terminal station repeats this operation, recognizes the centralized control station to which it belongs, recognizes the HP of the frequency, and stores it.

If the HP cannot be acquired in S5407 as a result of the HP acquisition processing in S5406, S
In 5413, the user of the terminal is notified using the warning sound and the screen display that the HP could not be acquired, and the H is returned in S5406.
Continue the process to get P.

When it is detected in S5407 that the HP has been acquired, a process for notifying the central control station of the address of the terminal station is performed using the LCCH frame in S5408. Here, using the LCCH frame, a global address received by all terminals is put in the DA part in this frame, and a registration request and its own terminal address are put in the Data part and transmitted to the centralized control station. After transmitting this signal, the terminal station receives the LCCH frame while changing the frequency according to the HP acquired in S5409.

If the same address as the self terminal cannot be confirmed in the DA part in the LCCH frame received in S5410, it is monitored in S5414 whether a predetermined time has elapsed after the self terminal address was transmitted. If the predetermined time has not elapsed, the process for receiving the central control station address in the LCCH frame from the central control station is continued. If it is detected in S5414 that the predetermined time has passed, LC is executed in S5408.
The process for notifying the control terminal of its own terminal address is performed again using the CH frame.

In S5410, when the own terminal address is detected in the DA part in the LCCH frame from the centralized control station and the data indicating the registration is confirmed in the Data part, S
5411 DA of LCCH frame to central control station
The address of the centralized control station is entered in the section, the signal indicating the completion of startup is entered in the Data section, and the LCCH frame is transmitted. When the output of this signal is completed, the process proceeds to the intermittent reception process in S5412. (3) Processing at the time of outside line transmission from the wireless terminal FIG. 16 is an explanatory diagram showing an outside line transmission operation sequence in the present embodiment. FIG. 17 is a flowchart showing the operation of the wireless terminal 110 at the time of making an outside line in this embodiment, and FIG. 18 is a flowchart showing the operation of the network control device 101 at the time of making an outside line in this embodiment.

In the wireless terminal 110, when the calling key is pressed or a calling operation is made by a combination of off-hook or the like and dial (YES in S5801), the wireless terminal 1
In order to acquire the HP necessary for wireless communication, 10 transmits an HP acquisition request (5601) to the centralized control station (S5
802).

Note that the type of wireless communication (voice / data) is added as a parameter to the HP acquisition request, and in this embodiment voice is used as a parameter.

Upon receiving the HP acquisition request, the centralized control station selects a different HP depending on the data type and notifies the wireless terminal 110 by an HP notification (5602).

Upon receiving the HP notification (5803), the wireless terminal 110 stores the HP and uses it to send a connection request (5603) to the network control apparatus 101 (S5804).

Upon receiving the connection request (YES in S5701), the network control apparatus 101 checks the state of the wireless line, and if the connection is possible, transmits a connection confirmation (5604) (S5702).

When the wireless terminal 110 receives the connection confirmation (S5805), it recognizes that the link establishment of the wireless line is permitted, synchronizes with the voice channel, and makes an outside line call (560).
6) is transmitted to the network control device 101 (S5806), and then a voice communication path is connected to establish a communication (S5807).
The dialing of the other party is included as a parameter in this outside line transmission, and the LCCH of the radio frame shown in FIG. 5 on the radio link between the radio terminal 110 and the network control device 101.
Sent by

Upon receiving the outside call (5606), the network control device 101 determines whether the outside call is possible. If the public network line is available and transmission is possible, the public network 102 is captured (S5704). When the dial tone (5607) from the public network 102 is detected after the outside line is captured, the dial (5608, 5609) transmitted from the wireless terminal 110 by the outside line is sent to the public network 102.
To start sending (S5705).

When all digits have been transmitted and the dial transmission is completed (S5706), the communication path with the public network 102 is connected to establish a communication (S5708). The public network 10
When 2 receives the dial and calls the other party, the public network 10
Since the ringback tone (5610) is transmitted from No. 2, the wireless terminal 110 can hear it. Then, when the other party responds, the ringback tone stops and the call is in progress (5611).

Next, when the call ends and the wireless terminal 110 performs a disconnecting operation (for example, on-hook) (S5808),
The on-hook (5612) is sent out (S5809).
This on-hook is received by the network control device 101 (S570
9), the network control device 101 disconnects the public network 102 (S
5711) and disconnection confirmation (5613) is confirmed by the wireless terminal 110.
To (S5711).

Upon receiving the disconnection confirmation, the wireless terminal 110 releases the communication path (S5810) and transmits an HP release request (5614) to the centralized control station to release the wireless line (S5811).

When the central control station normally receives the HP release request and performs the HP release processing, the HP release (5615)
Send The wireless terminal 110 releases the HP (561
When 5) is received (S5812), the process ends. (4) Processing when an external line arrives at a wireless terminal (4.1) Operation of network control device FIG. 19 is an explanatory diagram showing an external line incoming sequence in the present embodiment, and FIG. 20 shows an external line incoming call in the present embodiment. 6 is a flowchart showing the operation of the network control device 101 at the time.

First, when there is an incoming call (6101) from the public network 102 in S6201, the process proceeds to S6202, in which the network control device 101 makes a request (6102) for the HP to be used for the call to the central control station. Upon receiving the request for the HP, the centralized control station selects an HP that is not currently used from the HP table managed by the centralized control station, and the network control device 101
The HP to the network control device 1 (6103).
01 receives the HP information in S6203.

Next, in S6204, the network control apparatus 101
Transmits an external line incoming signal 6104 to the wireless terminals 110A and B.

The wireless terminal 110 (A) goes off-hook, and the network control apparatus 101 sends an off-hook signal (610) at S6205.
When 5) is received, the process proceeds to S6206, and a connection request signal 610 carrying information such as HP used for outside line communication is sent to the wireless terminal 110 (A) which transmitted the off-hook signal.
Send 6.

When the connection confirmation signal 6107 is received in step S6207, the process advances to step S6208 to notify the central control station that the connection with the wireless terminal 110 has been completed (6108), and in step S6209 the wireless terminal 110 ( While transmitting the call display signal 6109 to (A), the process proceeds to S6210, and the other wireless terminal 110 (here, the wireless terminal 11).
0 (B)), an external line termination cancellation signal 6110 is transmitted. Then, in step S6211, the wireless terminal 110 (A)
Is connected to the public network 102 and a call is started.

Further, the network control device 101 continues the connection with the public network 102 until it receives the on-hook signal 6111 from the wireless terminal 110 (A) in S6212. When the on-hook signal 6111 is received, the processing proceeds to step S6213, the line disconnection signal 6112 is transmitted, and the public network 102 and the wireless terminal 110 are transmitted.
Stop the connection of (A). Further, in S6214, the outside line busy display stop signal 6113 is transmitted to the other wireless terminal 110 (B).

Finally, the network controller 101 sends the HP used in the call to the centralized control station in step S6215.
The central control station updates the HP management table and notifies the network control apparatus 101 that the HP has been released (S6216, 6115).
I do. (4.2) Operation of Wireless Terminal FIG. 21 shows the wireless terminal 11 upon receiving an outside line in this embodiment.
It is a flow chart which shows operation of 0.

First, in S6301, the network controller 10
When the external line incoming signal 6104 is received from the wireless terminal 1, the wireless terminal 1
10 sounds a ring tone or the like, and detects in S6302 whether or not the terminal is off-hook. When the wireless terminal 110 (A) is off-hooked, the process advances to step S6303 to transmit an off-hook signal 6105 to the network control apparatus 101. S630
If the connection request signal 6106 including the information such as HP is received from the network control device 101 in step 4, the connection confirmation signal 6107 is returned in step S6305.

When the call control signal 6109 is received from the network control device 101 in step S6306, the wireless terminal 110 (A)
A call in progress display is displayed on the display unit 212, and the call is started in S6307. Further, the call is continued until the on-hook is made in S6308, and when the on-hook is made, S6309
Then, the on-hook signal 6111 is transmitted to the network controller 101. In S6310, the line disconnection signal 6112
When the call comes, the line is disconnected, the in-call display on the display unit 212 is erased, and the call is ended.

Also, in S 6311, the wireless terminal 11
Before 0 is off-hook, another wireless terminal 110
Since (A) has started a call, wireless terminal 110 (B)
If the external line termination cancellation signal 6110 is received, the wireless terminal 110 (B) advances to S6312 and the wireless terminal 110 (B) proceeds to S6312.
The outside line is displayed on the display of. Furthermore, the wireless terminal 1
10 (B) continues to display the outside line busy display on the display unit until the outside line busy display stop signal 6113 arrives at S6313, and when the signal comes, erases the outside line busy display at S6314. (5) Processing of extension-to-extension call Next, assuming the case where an extension-to-extension call (voice communication) is made between two terminal stations, the operation of each of the calling-side wireless telephone and the called-side wireless telephone will be described. (2 wireless phones 1
In the case of making an extension call at 03, the calling side is 103-A and the called side is 103-B).

FIG. 22 is an explanatory diagram showing a sequence of control data of the centralized control station, the terminal station A (calling side), and the terminal station B (calling side), and FIG. 23 shows processing of the centralized control station. It is a flowchart which shows an outline. Further, FIG. 24 is a flowchart showing an outline of processing of the calling terminal station.
5 is a flow chart showing an outline of processing of the called terminal station. However, each flowchart mainly describes the related processing part.

First, in the wireless telephone 103-A, when the extension key arranged in the key matrix 211 is pressed (S6801), the wireless telephone 103-A sends an HP acquisition request signal (6601) to the HP for control data communication. And L
It transmits using CCH (S6802).

The centralized control station judges that a signal has been received (S
6701) and if it is determined that the signal is an HP acquisition request (S6702), it is confirmed whether there is an HP resource (S6705). If there is an HP resource, HP is secured for this request (S6706). ), And notifies the HP (S6707).

The radiotelephone 103-A sends the HP notification (66
02) is received (S6803), the dial tone (DT) is transmitted to the user from the wireless telephone itself as the communication is possible (S6804).

If the centralized control station determines in S6705 that there are no resources, the centralized control station issues a communication disable notification (S6708), and the wireless telephone set 1 that has received the notice.
03-A notifies the user by sound or display that communication cannot be performed (S6818).

The wireless telephone set 103 that heard the dial tone
The user of -A inputs information (address) indicating the wireless telephone 103-B, which is the call destination, from the key matrix 211 (stop dial tone). Then, waiting for the other party to be designated (S6819), the wireless telephone 103-A
Transmits a connection request (6603) to the wireless telephone 103-B using the LCCH on the HP for control data communication (S6805). At that time, the information of the HP previously assigned by the central control station is also notified.

The radiotelephone 103-B is waiting for reception at the HP for control data communication and receives the connection request (S
6901) and the other party (caller) that sent the request signal, a connection confirmation (6604) is sent to the HP for control data communication.
To transmit using the LCCH (S6902). After this,
The wireless telephone 103-B switches the HP so as to communicate using the HP notified from the wireless telephone 103-A.

Upon receiving the connection confirmation (S6806), the wireless telephone 103-A completes the connection to the central control station (660).
5) The signal is transmitted on the HP for control data communication using the LCCH (S6807), and the centralized control station knows that a wireless link has been established between the extensions. When the wireless link is established between the extensions, the wireless telephone 103-A switches the HP to the HP assigned by the central control station and sets up the call (660
6) Send a signal to the wireless telephone 103-B. This signal is also transmitted with the address of the wireless telephone 103-B added (S6808), and the user hears the ringback tone (RBT) from the speaker (210) to inform that the user is calling (S6820).

Upon receiving the call setting (S6903), the radio telephone 103-B on the called side displays a sound (ring tone) from the speaker (210) and a display notifying the incoming call to the display unit 212 (S6910). It prompts the user of the wireless telephone 103-B for a response.

When the user of the wireless telephone 103-B performs a response operation using the key matrix 211 (S6911), the wireless telephone 103-B sends a response (6607) to the wireless telephone 10-B.
The address of 3-A is added and transmitted (S6904).
At this point, the wireless telephone 103-B is in a call state (S6
905), the notification of the incoming call is stopped, and the speaker (210)
And connect the microphone (209) to prepare for the call. At this time, the address of the caller's wireless telephone 103-A may be displayed on the display unit 212.

On the other hand, when the radio telephone 103-A receives the response (6607) from the radio telephone 103-B (S607).
6809), the ring back tone is stopped, the speaker 210 and the microphone 209 are connected, and a call is made (S).
6810).

The wireless telephone 103-A monitors whether the user operates the telephone to end the call such as on-hook or receives a disconnection from the wireless telephone 103-B (S6811).
In addition, the wireless telephone 103-B is also connected to the wireless telephone 10-
Monitor whether disconnection is received from 3-A (S690
6).

When the user of the wireless telephone 103-A performs a call end operation, the wireless telephone 103-A disconnects (66
08) is transmitted (S6812), and the connection between the microphone 209 and the speaker 210 is released. The wireless telephone 103-B is
Upon receiving the disconnection, the microphone 209 is disconnected and the speaker 210 stops outputting voice from the other party and outputs a busy tone instead to notify the user that the other party has disconnected the call (S6912). ), Wireless telephone 103
-Encourage B to go on-hook.

After waiting for the user of the wireless telephone 103-B to perform the on-hook operation (S6913), the wireless telephone 1
03-B sends a release (6609) (S6907)
And end the call. Upon receiving the release (S6813), the wireless telephone 103-A determines that the call is completely terminated, and then releases the wireless link (66).
10) is transmitted (S6814).

The radio telephone 103-B requests release (66
10) is received (S6908), release confirmation (661)
1) is transmitted (S6909), radio wave transmission is stopped, and the wireless link is disconnected.

The radio telephone 103-A confirms the release (66
11) is received (S6815), the frequency is switched to the HP for transmitting the control data, and the HP release request (6612) used for the central control station is transmitted (S681).
6) and the centralized control station determines that the release request has been received (S
6703) Then, the HP is released and the wireless telephone 10
The HP release notification (6613) is transmitted to 3-A (S67).
04). Upon receiving the HP release notification (S6817), the wireless telephone 103-A disconnects the wireless link, stops the transmission / reception of radio waves, and ends the communication.

By the above procedure, a direct call between extension lines can be realized.

Next, a second embodiment of the present invention will be described.

In the first embodiment described above, the wireless telephone 103 is used as an example of the wireless terminal 110 to describe the operation in the case of performing an outside call and an extension call by voice. In the second embodiment, the data communication by the data terminal is performed. The operation when performing is described. (Data Communication Process Between Wireless Terminals) FIG. 26 is an explanatory diagram showing a sequence of data communication in the second embodiment, and FIG. 27 shows the wireless terminal 110 at the time of connection in the data communication of the second embodiment. It is a flow chart which shows operation. Further, FIG. 28 is a flow chart showing the operation at the time of data transmission of the communication terminal of the second embodiment.
FIG. 8 is a flowchart showing the operation of the communication terminal of the second embodiment when receiving data. Further, FIG. 30 shows the wireless terminal 110 at the time of disconnection in the data communication of the second embodiment.
6 is a flowchart showing the operation of the first embodiment.

When a transmitting operation is performed in the transmitting terminal station of the wireless terminal 110 (S7701), first, an HP acquisition request 7601 is transmitted to the central control station (S770).
2). Then, if the HP notification 7602 from the central control station is received (S7703), the connection request 7603 is transmitted to the receiving terminal station, and the HP assigned for the communication from the central control station in the future is used. Is notified (S7704).

Then, the connection confirmation from the receiving terminal station 7604
When receiving (S7705), the connection completion (7605) is transmitted to the centralized control station and the call setup is completed (S770).
6). Then, when the call setup is completed, data communication is next performed. In this embodiment, transmission of data from a transmitting terminal station will be described.

When the communication is started, the transmitting terminal station first resets the transmission counter to 0 (S7801).
Then, it is checked whether or not there is a retransmission request from the wireless side (S
7802), if there is not, it is checked whether or not there is a data transmission request from the terminal (S7807).

If there is a transmission request, the requested data number is put in the transmission counter (S7808),
The data 7606 of the number in the transmission counter is transmitted (S7809).

When the resend request 7607 is received, the number of the resent data is designated (S7803), and the data of the designated number is transmitted (S7804). And
If the designated data number is smaller than the transmission counter data (S7805), the designated data number is designated (S7806), and the designated data is transmitted (S7).
804). When the designated data number matches the transmission counter number (S7806), the normal transmission state is restored. After this, if a disconnection request is received from the terminal (S7
810) End the transmission.

When the communication is started, the receiving terminal station first resets the reception counter to 0 (S7901).
When the data is received (S7902), it is checked whether or not the data has a reception error (S7903). If there is no error in the data, the data number is checked next (S790
4), it is checked whether or not the data number is next to the reception counter number (S7905). If the data is received in the correct order, the data is sent to the terminal (S7
907), and put the data number in the reception counter (S
7908). If the data is not received in order due to an error in the data or a missing data number, a resend request 7607 is transmitted (S7906). When the disconnection request is received from the terminal (S7909), the reception is ended.

When the calling terminal station receives the disconnection request and shifts to the disconnection sequence (S8001), it sends a line disconnection notification 7608 to the called terminal station (S8002) and confirms the line disconnection 76.
When 09 is received (S8003), HP release 7610 is issued to the central control station to release the used HP.
Is transmitted (S8004). When the HP release confirmation 7611 is received, the disconnection sequence is ended (S8005).

[0142]

As described above, according to the present invention,
Since the centralized control station manages the hopping pattern used in the system, the hopping pattern can be assigned to each terminal without duplication, and there is an effect that the wireless communication by frequency hopping can be performed efficiently.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing an internal configuration of the wireless telephone according to the embodiment.

FIG. 3 is a block diagram showing an internal configuration of a wireless adapter in the above embodiment.

FIG. 4 is a block diagram showing an internal configuration of a network control device in the above embodiment.

FIG. 5 is an explanatory diagram showing a channel configuration inside a frame used in the above embodiment.

FIG. 6 is an explanatory diagram showing an example of the internal configuration of each channel in the above-described embodiment.

FIG. 7 is an explanatory diagram showing an example of frequency hopping used in the above embodiment.

FIG. 8 is an explanatory diagram showing a state of frequency hopping of the terminal in the above embodiment.

FIG. 9 is an explanatory diagram showing an HP allocation sequence in the above embodiment.

FIG. 10 is a flowchart showing an HP allocation operation in the centralized control station of the above embodiment.

FIG. 11 is a flowchart showing an HP release operation in the centralized control station of the above embodiment.

FIG. 12 is an explanatory diagram showing an operation sequence of the centralized control station and the terminal station when the power is turned on in the above embodiment.

FIG. 13 is a flowchart showing an operation at power-on in the centralized control station of the above embodiment.

FIG. 14 is a flowchart showing an operation at the time of newly registering a terminal station in the centralized control station of the above embodiment.

FIG. 15 is a flowchart showing an operation at power-on in the terminal station of the above embodiment.

FIG. 16 is an explanatory diagram showing an outside line transmission operation sequence in the above embodiment.

FIG. 17 is a flowchart showing an operation of the wireless terminal when an outside line is transmitted in the above embodiment.

FIG. 18 is a flow chart showing the operation of the network control device at the time of making an outside line in the above embodiment.

FIG. 19 is an explanatory diagram showing an outside line incoming sequence in the above embodiment.

FIG. 20 is a flowchart showing the operation of the network control device when an outside line is called in the above embodiment.

FIG. 21 is a flowchart showing the operation of the wireless terminal when an outside line is received in the above embodiment.

22] Central control station and terminal station A in the above embodiment
It is explanatory drawing which shows the sequence of the control data of (calling side) and the terminal station B (calling side).

FIG. 23 is a flowchart showing the processing of the centralized control station in the above embodiment.

FIG. 24 is a flowchart showing the processing of the calling terminal station in the above embodiment.

FIG. 25 is a flowchart showing the processing of the called-side terminal station in the above embodiment.

FIG. 26 is an explanatory diagram showing a sequence of data communication according to the second embodiment of the present invention.

FIG. 27 is a flowchart showing an operation of the wireless terminal at the time of connection in the data communication of the second embodiment.

FIG. 28 is a flowchart showing an operation at the time of data transmission in the communication terminal of the second embodiment.

FIG. 29 is a flowchart showing an operation at the time of receiving data in the communication terminal of the second embodiment.

FIG. 30 is a flowchart showing an operation of the wireless terminal when disconnecting in the data communication of the second embodiment.

[Description of Reference Signs] 101 ... Network control device, 102 ... Public line, 103 ... Wireless telephone, 104 ... Computer, 105 ... Multimedia terminal, 106 ... Printer, 107 ... Facsimile, 108 ... Copier, 109 ... LAN gateway.

Claims (2)

[Claims] 1. In a wireless communication system configured to have a plurality of wireless communication terminals and at least one centralized control terminal and performing spread spectrum communication by a frequency hopping system, one wireless communication terminal is another wireless communication terminal. Prior to starting communication with the wireless communication terminal that has made a communication request,
A means for notifying the central control terminal of an acquisition request for the hopping pattern currently in use, the central control terminal, when receiving the request for the hopping pattern acquisition, of the hopping pattern table managed by the own terminal. A means for searching for an unused hopping pattern from among, a means for notifying the wireless communication end that has transmitted the hopping pattern acquisition request of the last-used hopping pattern, and an end-use hopping pattern for notifying the wireless communication end Is registered in the hopping pattern table as being in use, and a frequency hopping pattern allocation method. 2. The wireless communication terminal according to claim 1, wherein the wireless communication terminal not requesting the acquisition of the hopping pattern is promptly used for communication with the centralized control terminal when the intended communication is completed. The centralized control terminal unregisters the hopping pattern requested to be released in the hopping pattern table when it receives the hopping pattern release request. A frequency hopping pattern allocation method comprising means.