JPH09116526A - Frequency hopping pattern allocation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the waiting time for user of a radio communication termi nal and also to reduce the communication traffic of a radio communication system by eliminating the overhead time that is needed for allocation of a hopping pattern. SOLUTION: A radio telephone set 3 or one of radio data terminals 4 to 9 gives a request to a centralized control terminal for allocation of a hopping pattern that is used for communication when the communication is requested and the hopping pattern is not allocated yet. Thus, te centralize control terminal retrieves an unused hopping pattern within a system based on the allocation request given from the radio communication terminal. Then the centralized control terminal notifies the radio communication terminal of the retrieved unused hopping pattern and also registers it as a working hopping pattern.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency hopping pattern allocation method in a wireless communication system, and more particularly to a frequency hopping pattern allocation method suitable for performing spread spectrum communication by a frequency hopping method.

[0002]

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

[0003]

In the above-described spread spectrum communication using the conventional frequency hopping system, a plurality of hopping patterns are set in advance in order to prevent the same frequency from being used at the same time. The plurality of wireless communication terminals perform communication in accordance with any one of the hopping patterns, so that the plurality of wireless communication terminals can simultaneously perform high-throughput communication. Therefore, a centralized control station that manages which wireless communication terminal uses which hopping pattern is provided, and each wireless communication terminal first receives a hopping pattern from the centralized control station before starting communication, and then allocates it. A method is conceivable in which communication is performed using the hopping pattern provided.

However, in the above method, overhead (time that is not directly related to communication but is indirectly required, which seems to be wasted seemingly) is generated from the time when a communication request is made until the time when communication is actually started. Occurs, and the load (communication traffic) of the wireless communication system increases by the amount of the overhead. Further, there is a problem that the user of the wireless communication terminal lacks in convenience, such as an increase in the waiting time from the start of the calling operation until the communication becomes possible.

The present invention has been made in view of the above points, and by eliminating the overhead time for hopping pattern allocation, the waiting time of the user of the wireless communication terminal is shortened and the communication traffic of the wireless communication system is reduced. It is an object of the present invention to provide a frequency hopping pattern allocation method capable of reducing the above.

[0006]

In order to achieve the above object, the invention of claim 1 is a radio communication system in which a plurality of radio communication terminals and at least one centralized control terminal perform spread spectrum communication using frequency hopping. In the frequency hopping pattern allocation method in, a step of requesting the centralized control terminal to allocate the hopping pattern when the wireless communication terminal generates a communication request and the hopping pattern used for communication is not allocated,
The centralized control terminal searches for an unused hopping pattern in the system based on the allocation request, the centralized control terminal notifies the searched wireless communication terminal of the unused hopping pattern, and a centralized step. And a step of registering the notified hopping pattern as being in use.

In order to achieve the above object, the invention of claim 2 is the frequency hopping pattern allocation method according to claim 1, wherein the wireless communication terminal requesting allocation of the hopping pattern continues until a predetermined time elapses from the end of communication. A step of storing the hopping pattern assigned from the centralized control terminal, and a step of starting communication using the stored hopping pattern when the wireless communication terminal issues a communication request again within the predetermined time. It is characterized by having.

In order to achieve the above object, the invention of claim 3 is the method of allocating a frequency hopping pattern according to claim 1, wherein the wireless communication terminal requesting the allocation of the hopping pattern has passed a predetermined time from the end of communication. A step of requesting the centralized control terminal to release the allocated hopping pattern, and a step of re-registering the release-requested hopping pattern as an unused state by the centralized control terminal based on the release request. To do.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

[I] First Embodiment In the radio communication system according to the present embodiment, a central control station for managing and controlling communication of radio communication terminals accommodated in the system is provided, and each terminal station Is to perform wireless communication according to control data transmitted from the centralized control station using a wireless frame described later. The terminal station that can be the centralized control station is at least one of the terminal stations in the system.

FIG. 1 is a block diagram showing a configuration of a wireless communication system according to this embodiment. This wireless communication system includes a network control device 1, a public network line 2, and a wireless telephone 3.
And wireless data terminals 4 to 9.

[0012] To describe the configuration of each of the above parts in detail, the network control device 1 accommodates the public network line 2 and provides the public network communication service to the terminal stations in the system. The wireless telephone 3 exchanges control data or voice data with a centralized control station or another terminal station, performs voice communication via the public line 2, and performs so-called extension communication among a plurality of terminal stations. The wireless data terminals 4 to 9 perform control data communication and data communication with the centralized control station or other terminal stations. still,
The terminal stations of the wireless telephone 3 and the wireless data terminals 4 to 9 are collectively referred to as a wireless terminal 10 (general number of 3 to 9).

In this case, the wireless data terminals 4 to 9 are connected to a terminal device (data terminal) having a function of transmitting and receiving data in bursts or a data input / output device and a wireless adapter for controlling wireless communication, or It refers to a terminal device that integrates them. For example, in the example of FIG. 1, a computer 4, a multimedia terminal 5, a printer 6, a facsimile 7, a copying machine 8, a LAN (Local Area Network).
k) In addition to the gateway 9, devices such as electronic cameras, video cameras, and scanners are applicable.

The above-mentioned wireless telephone 3 and wireless data terminal 4
The main features of this wireless communication system are that the terminals 9 to 9 can freely communicate with each other and can access the public network line 2 at the same time. The detailed configuration and operation will be described below.

"Wireless Telephone" FIG. 2 is a diagram showing an internal configuration of the wireless telephone 3 shown in FIG.
Main control unit 11, memory 12, speech path unit 13, AD
PCM (Adaptive Differential Pulse Code Modul
ation) codec section 14, frame processing section 15,
The wireless control unit 16, the wireless unit 17, the handset 18, the microphone 19, the speaker 20, the key matrix 21,
The display unit 22 is provided.

The structure of each of the above parts will be described in detail. The main controller 1
1 controls the entire wireless telephone 3. The memory 12 is
ROM storing the control program of the main control unit 11, EEPROM (electrically erasable programmable ROM) for storing the calling code (system ID) of the wireless communication system and the sub ID of the wireless telephone 3, It is composed of a RAM or the like which is a work area for control. The communication path unit 13 includes the input / output blocks of the handset 18, the microphone 19 and the speaker 20, and the ADPCM codec unit 1.
Interface with 4.

The ADPCM codec section 14 converts the analog voice information from the speech path section 13 into an ADPCM code and also converts the ADPCM coded information into analog voice information. The frame processing unit 15 performs processing such as scrambling on the ADPCM encoded information, and
It has a function as a channel codec unit for time division multiplexing into a predetermined frame. The data assembled into the wireless frame in the frame processing unit 15 is the wireless unit 1
It will be transmitted to the main device and the target terminal station via the communication terminal 7.

The radio control unit 16 has a function of performing transmission / reception switching of the radio unit 17, change of frequency, carrier detection, level detection, bit synchronization and the like. The wireless unit 17 modulates the digital information from the frame processing unit 15 and converts it into a format that can be wirelessly transmitted, and sends it to an antenna (not shown).
The information wirelessly received via the antenna is demodulated and converted into digital information. The handset 18 is for inputting and outputting a call voice signal. The microphone 19 collects and inputs a voice signal. The speaker 20 outputs the audio signal in a loud voice. The key matrix 21 is composed of function keys such as dial keys for inputting dial numbers and the like, external line keys, hold keys, speaker keys and the like. The display unit 22 displays the dial number input from the key matrix 21 and the usage status of the public line.

"Wireless Adapter" FIG. 3 is a diagram showing the internal structure of a wireless adapter connected (or built-in) to the wireless data terminal devices 4 to 9 shown in FIG. 1, and a data terminal (or printer) represented by a computer. -Wireless adapter 3 connected to peripheral device 31 typified by facsimile
2, a wireless unit 33, a main control unit 34, a memory 35,
The communication interface unit 36, the timer 37, the channel codec unit 38, the wireless control unit 39, and the error correction processing unit 40 are provided.

The configuration of each of the above parts will be described in detail. The wireless adapter 32 can be connected to the data terminal (peripheral device) 31 via a communication cable or an internal bus. Under the control of the CPU in the main control unit 34, the radio unit 33 modulates the framed digital signal from the channel codec unit 38 to wirelessly communicate the data and demodulates the signal received via the antenna. Processing into a framed digital signal. The main control unit 34 includes a CPU and interrupt control
It is composed of a peripheral device that performs DMA (Direct Memory Access) control and the like, an oscillator for a system clock, and the like, and controls each block inside the wireless adapter 32.

The memory 35 is composed of a ROM for storing programs used by the main control section 34, a RAM used as a buffer area for various processes, and the like. The communication interface unit 36 is equipped with the data terminal (peripheral device) 31, for example, a communication interface such as RSC232C (standard interface for serial data transmission), Centronics (8-bit parallel interface for printer), LAN, personal computer, or work. Station ISA (Industry Standard Architectrue) bus, PCMCIA (Personal Computer Memory Car)
d International Association) Controls the wireless adapter 32 when performing communication using an internal bus such as an interface.

The timer 37 supplies timing information used by each block inside the wireless adapter 32. The channel codec unit 38 assembles / assembles a radio frame, which will be described later.
Not only disassemble, but also CRC (Cyclic Redundanc
y Check), which performs simple error detection processing, scrambling processing, control of the radio unit 33, and the like. Wireless control unit 3
Reference numeral 9 has a function of controlling transmission / reception switching, frequency switching, etc. of the wireless unit 33, and also has a function of performing carrier detection, level detection, and bit synchronization.

The error correction processing section 40 has a function of detecting or correcting a bit or byte error occurring in communication data due to various wireless environments. The error correction processing unit 40 inserts an error correction code into the communication data at the time of transmission to make the data redundant, and at the time of reception, calculates the position where the error occurred and the error pattern by the calculation process. The bit error generated in the received data is corrected by.

"Network Control Device" FIG. 4 is a diagram showing the internal configuration of the network control device 1 of FIG. 1 described above.
The main control unit 41, the memory 42, the line interface unit 43, the ADPCM codec unit 44, the channel codec unit 45, the wireless control unit 46, the wireless unit 47, and the detection unit 48 are provided. .

The configuration of each of the above parts will be described in detail. The main controller 4
1 controls the entire network control device 1. The memory 42 is
It is composed of a ROM for storing a program and a calling code (system ID) of the present wireless communication system, a RAM for storing various data for controlling the main control unit 41, and a RAM serving as a work area for various calculations. The line interface unit 43 supplies power for accommodating the public network line 2 (see FIG. 1), transmits a selection command, closes a DC loop, and PCM.
It performs public network line control such as conversion, receives selection commands, and sends call commands.

The ADPCM codec unit 44 converts the analog voice signal received by the line interface unit 43 via the public network line 2 into an ADPCM code, transfers the ADPCM code to the channel codec unit 45, and at the same time, outputs the ADPCM code from the channel codec unit 45. The converted audio signal is converted into an analog audio signal. The channel codec unit 45 uses A
The DPCM-coded information is subjected to scrambling and the like and time-division multiplexed into a predetermined frame. The data assembled into the wireless frame by the channel codec unit 45 is transmitted to the centralized control station and the target wireless terminal 10 via the wireless unit 47.

The radio control section 46 controls the transmission / reception switching, frequency switching, etc. of the radio section 47, and also has the functions of carrier detection, level detection, and bit synchronization. The wireless unit 47 modulates the framed information from the channel codec unit 45 and converts it into a format that can be wirelessly transmitted and sends it to the antenna, and demodulates the information wirelessly received via the antenna and processes it into digital information. To do. Detector 48
Detects various tones such as incoming call detection, loop detection, PB signal, dial tone and ring tone.

"Radio Frame" FIG. 5 is a diagram showing the internal channel structure of a radio frame used in the present embodiment. In FIG. 5, CNT indicates a system control channel and LCCH indicates a logical control channel. The two voice channels and the data channel are used for bidirectional voice and data transmission / reception, and END is a guard time until the frequency change is completed in order to perform frequency hopping in the next frame. Show.

FIG. 6 is a diagram showing the internal structure of each channel of the radio frame. In FIG. 6, CS is 12.8.
μsec carrier sense time, R is 6.4 μsec ramp bit, PR is 56-bit preamble for bit synchronization supplement, SYN is 1 in 31 bits specified by RCR
Frame sync signal with dummy bit added, ID is RCR
63-bit calling signal specified by 1-bit dummy, UW is 24-bit unique word (for supplementing byte synchronization), BF is 8-bit basic frame number information (1 to 20 cycles), 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.

NF is frequency information used in the next frame, Rev is an area number for distinguishing from adjacent cells, GT is a guard time, CS0 / CS1 / CS2 is a carrier sense time, and DA is a system address. Field, CRC of system control channel is BF ~ R
CRC information up to ev, Data is a field for writing data to be transmitted, CRC of the logical control channel is CRC information for Data, CRC of the voice channel is T / R CRC information, CF is a guard time for frequency switching. , T / R represent B channel information of 32 kbps. The numbers shown in the drawing represent the number of bits, and show an example of the number of bits of each part.

The CNT channel is transmitted by the centralized control station at the start of every frame, and the terminal stations other than the centralized control station always receive the CNT channel in order to establish bit synchronization and frame synchronization. The LCCH channel is used for exchanging a hopping pattern allocation request with the central control station prior to line connection or line disconnection, or for exchanging hopping pattern allocation with the central control station during line disconnection. When connecting or disconnecting a line, the system address of the communication partner with whom communication is desired is entered in the DA field provided in the LCCH channel, and direct communication is performed with the communication partner.

The voice channel realizes full-duplex voice communication by using one of the two voice channels for transmission and the other voice channel for reception. Which of the two voice channels is to be used for transmission is determined by having a meeting with the communication partner terminal on the LCCH channel exchanged at the time of line connection. The data channel is an LCCH channel that is exchanged when the line is connected.
Decide how to perform data transmission.

"Frequency Hopping" FIG. 7 is a diagram showing an example of frequency hopping, in which the horizontal axis represents time and the vertical axis represents frequency. The time is divided at certain intervals into a base frame (hereinafter referred to as BF). And abbreviated). In FIG. 7, BF has 8 frames and frequencies are F1 to F8.
Up to 8 systems are used as an example.

In FIG. 7, a hopping pattern (hereinafter abbreviated as HP) in which the centralized control station transmits the system control channel is referred to as a first HP. That is, when BF1, F1, B
The frequency is changed for each BF, such as F2 for F2, F3 for BF3, and so on. Furthermore, in the first HP, the terminal A and the terminal B perform voice communication, and the second HP
In the third terminal H and the terminal D, voice communication is performed, and the third H
In P, it is assumed that the terminal A and the terminal B are performing data communication. In this way, each HP does not use the same frequency in the same BF, but always uses different frequencies.
Further, one frame shown in FIG. 5 exists in 1BF, and the frequency is changed in a determined order (HP) after transmitting one frame, that is, every time 1BF is completed.

FIG. 8 is a diagram showing details of the frequency hopping of terminals A and B. How to perform frequency hopping in this wireless communication system will be described with reference to FIG. All wireless terminals 10 other than the central control station are shown in FIG.
In BF1, first, in order to receive the system control channel transmitted by the centralized control station, the frequency set in the radio unit is set to the frequency F1 used in BF1 by the first HP. All wireless terminals 10 other than the central control station establish frame synchronization on 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 that another terminal transmits on the logical control channel. If the received data is not the control data addressed to the terminal itself, the received control data is discarded.

When the logical control channel is terminated, the terminal in voice communication or data communication moves to a frequency corresponding to the frequency (HP) previously assigned by the central control station in the voice channel and the data channel. After the end of the data channel, the system control channel is received by the next BF2 during END, so that the frequency is set to the first H level.
The frequency is changed to F2 which is the frequency used when P is BF2. The procedure of frequency hopping after the base frame becomes BF2 repeats the procedure described above.

Next, the detailed operation of the radio communication system will be described.

(1) Operation of centralized control station In order for the present 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. In addition to the function of managing each communication channel, the centralized control station has functions such as changing the HP of the system, managing the intermittent reception status of terminal stations, and registering the system of terminal stations. In this section, communication between terminal stations is performed. The management of the communication channel, which is the basis for performing, will be described. The management of the communication channel in the centralized control station is to allocate or release an unused HP for the data type (voice or data) of the communication requested by the terminal station.

FIG. 9 is a diagram showing an HP allocation sequence, in which the terminal station requests HP to the central control station in order to communicate with a specific communication partner station, and the communication is terminated after a predetermined time elapses. The sequence until release is illustrated. Before starting communication with a specific communication partner station, the terminal station first transmits an HP allocation request 51 to the centralized control station when it does not hold the HP to be used. The HP allocation request 51 includes the ID of the communication partner station.
And parameters such as data type.

The centralized control station transmits the HP allocation 52 to the terminal station if there is an unused HP of the requested data type. The terminal station transmits the assigned HP to the communication partner station to make a connection request. When the connection permission is obtained from the communication partner station, the terminal station transmits the connection completion notice 53 to the centralized control station. The central control station notifies the terminal station of connection completion 53
By using the parameter, the usage status of the assigned HP is confirmed and managed, and the connection completion confirmation 54 is transmitted to the terminal station. Upon receiving the connection completion confirmation 54, the terminal station thereafter communicates with the notification partner station by the assigned HP.

When the communication is completed, the terminal station is set to HP until a predetermined time elapses after disconnecting the connection with the communication partner station.
If the communication request is generated again during this period, the connection completion confirmation 54 is omitted from the HP allocation request 51 and the HP used in the previous communication is continuously used for communication. The terminal station transmits the HP release request 55 to the centralized control station when the next communication request does not occur within the predetermined time. The centralized control station confirms the usage status of the assigned HP and transmits an HP release confirmation 56 to the terminal station.

FIG. 10 is a flowchart of the HP allocation processing in the centralized control station, showing the processing that is performed on the centralized control station side from the time when the terminal station requests the HP until the communication is started. From the terminal station, the central control station
When the allocation request is received (step S1), it is confirmed based on an HP table (not shown) whether or not there is an unused HP of the requested data type (step S2). If no unused HP exists, unused H is sent to the terminal station.
Notification of no P is given (step S4). On the other hand, unused H
If P exists, temporary registration is performed in the HP table (step S3), and then HP temporary allocation is performed for the terminal station (step S4).

When the centralized control station receives the connection completion notice from the terminal station (step S5), the HP that has temporarily assigned
Then, the terminal station confirms whether or not the connection with the communication partner station is successful (step S6). If the connection is not successful, the temporarily-assigned HP is unusedly registered in the HP table (step S9). If the connection is successful, the temporarily-assigned HP is used.
The P is registered for use in the HP table (step S8). After registering the usage status in the HP table as described above, the centralized control station transmits a connection completion confirmation to the terminal station (step S10), and terminates the requested HP allocation.

FIG. 11 is a flowchart of the HP release processing in the centralized control station. After the communication is completed in the terminal station,
H assigned by the central control station after a predetermined time
It shows the procedure for releasing P, and shows the processing performed by the centralized control station. From the terminal station, the central control station
When the P release request is received (step S11), the terminal ID included in the parameter and the HP of the release request are confirmed (step S12). If the HP of the release request is not the normally assigned HP, an error notification is transmitted to the terminal station (step S14) and the HP is not released. On the other hand, when the HP of the release request can be normally confirmed, unused registration is performed in the HP table (step S13), and the HP release confirmation is transmitted to the terminal station (step S15).

As described above, in this wireless communication system, the central control station has the HP table unique to the system,
The central control station allocates HP to allocate communication channels for communication between the terminal stations, and the central control station manages all communication in the system.

Next, a specific operation of the present wireless communication system will be described in some cases.

(2) Operation of centralized control station and terminal station when power is turned on (2.1) Operation of centralized control station and terminal station when power is turned on FIG. 12 shows a centralized control station when power is turned on in this wireless communication system. FIG. 6 is a sequence diagram showing operations of the terminal station. When the power is turned on in step S21 and the terminal is initialized accordingly, the terminal determines whether it is the central control station or the terminal station, and recognizes that it is the central control station, for example. Then, the HP is determined, 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, the address of the terminal itself and the area number of the central control station to be received are stored. When the process ends, the CNT frame from the centralized control station waits at an arbitrary frequency. When receiving the CNT frame from the centralized control station, the frequency for hopping in the next unit time is acquired based on the NF in the CNT frame. The terminal station changes the reception frequency based on the received NF and waits for the next CNT frame to be transmitted. The terminal station repeats the above processing to recognize the HP used by the central control station and store it.

When HP storage is completed at the terminal station,
In step S22, the central control station is notified that it will newly join as a terminal station in the system by using the LCCH frame. At this time, the DA address of the LCCH frame contains a global address received by all terminals, and the data part contains data indicating that new registration is to be performed, and the data is transmitted. The central control station receives the LCCH frame, analyzes the data in the data section when the DA section has a global address,
If there is a terminal station address and a registration request signal, the terminal station address is stored based on the information and new registration is performed.

When the new registration is completed, the central control station notifies the terminal station newly registered in step S23 of the address of the central control station using the LCCH frame. When the terminal station receives the address of the central control station by the LCCH frame, it stores the address of the central control station. After the processing is completed, the LCC is sent to the central control station in step S24.
The start-up completion notification is given using the H frame. When the centralized control station receives the startup completion notification from the terminal station, it shifts to normal processing. After the start-up completion notification is transmitted at the terminal station, the terminal station can make the transmission at step S25.

(2.2) Operation when power is turned on in central control station FIG. 13 is an operation flowchart when power is turned on in the central control station. When the power of the terminal is turned on (step S
31), the terminal is initialized and put into an operating state (step S32). When the terminal recognizes that it is the centralized control station as a result of the processing (the answer in step S33 is affirmative), it performs processing for storing the address information and area information of the terminal itself (step S34). As a method of inputting the terminal address information and area information, a method of storing a value set by a DIP switch or the like when the terminal is started up, a method of storing a value input from a dial key of a telephone, a keyboard of a computer or the like Various methods are conceivable, such as a method of receiving a value input from the device via a bus and storing the value.

When the address information is received, it is judged whether or not the input value is valid (step S35). If it is not valid (the answer at step S35 is negative), the address information is stored again at step S34. If it is valid (Yes in step S35), the process for determining the HP to be used is performed (step S3).
6). At this time, the centralized control station carries out carrier sense 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,
A process for assembling the CNT frame is performed (step S37). The CNT frame is a frame containing a synchronization signal ID, an area number, and frequency information. After completing the assembly of the CNT frame, start transmitting the CNT frame using one of the determined HPs (step S38),
The process shifts to normal processing (step S39).

(2.3) Operation at the time of new terminal registration in the centralized control station FIG. 14 is an operational flowchart at the time of new registration of the terminal station in the centralized control station. When the central control station receives the LCCH frame during normal processing (step S41) and the DA section contains the address addressed to itself or all terminals, the control data in the received LCCH frame is taken out and the command is executed. Yes (step S42). When it is confirmed that the received control data is the registration request from the terminal station (the answer in step S43 is affirmative), the terminal station address confirmation process transmitted together with the registration request is performed (step S44). When it is confirmed that the received control data is not the registration request from the terminal station (the answer in step S43 is negative), the process proceeds to another process.

As a result of the confirmation of the terminal station address, when it is detected that the terminal station address is normal (the answer in step S45 is affirmative), the centralized control station performs a process for registering the terminal station address and obtains the address information. It is stored (step S46). On the other hand, when it is detected that the terminal station address is not normal (the answer in step S45 is negative), LCCH
A process for discarding the registration request received in the frame is performed (step S50), and the normal process is performed again in step S41. When the registration of the terminal station is completed in step S46, the address of the central control station is entered in the Data section using the LCCH frame and the address of the terminal station is set to D.
It is placed in the A section and transmitted to the terminal station whose registration has been completed (step S47).

After the centralized control station address is transmitted, if the start-up completion notification signal using the LCCH frame from the registered terminal station cannot be confirmed (the answer in step S48 is negative), it is determined whether or not a predetermined time has elapsed. Is detected (step S51), and when a predetermined time has elapsed (step S51)
Is affirmative), the central control station address is notified again using the LCCH frame in step S47, and the response from the terminal is waited for. On the other hand, when the startup completion notification signal from the terminal station is detected (the answer in step S48 is affirmative), the new registration completion process of the terminal station is performed (step S49), and the process proceeds to the normal process.

(2.4) Operation at Power-on of Terminal Station FIG. 15 is an operation flowchart at power-on of the terminal station. When the power of the terminal is turned on (step S6)
1) Then, the terminal is initialized and put into an operating state (step S62). When the terminal recognizes that the terminal is a terminal station as a result of the processing (the answer in step S63 is affirmative), it performs processing for storing the address information and area information of the terminal itself (step S64). As a method of determining a terminal station or a centralized control station, and a method of inputting terminal address information and area information, a method of storing a value set by a DIP switch or the like at startup or a dial key of a telephone or the like is used. Various methods are conceivable, such as a method of storing a value and a method of receiving a value input from a keyboard of a computer or the like via a bus and storing the value.

When the address information is read, it is determined whether or not the input value is valid (step S65). If it is not valid (the answer in step S65 is negative), the address information is stored again in step S64. If it is valid (the answer in step S65 is positive), the process for acquiring the HP to be used is performed (step S6).
6).

In step S66, since the CNT frame from the centralized control station is received, the reception standby state is set at an arbitrary frequency. If the CNT frame from the centralized control station can be received at the frequency, the area number is recognized from the Rev section of 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, the terminal station sets the received frequency to the frequency, and waits for the next CNT frame. The terminal station repeats the above operation to recognize the centralized control station to which it belongs and also recognizes the HP of the frequency and stores it.

As a result of the HP acquisition processing in step S66, if HP cannot be acquired (step S6)
If the answer to No. 7 is negative), the user of the terminal is notified by a warning sound or screen display that HP could not be obtained (step S7).
3) Then, the process for acquiring HP is continued again in step S66. On the other hand, when it is detected that the HP has been acquired (the answer in step S67 is affirmative), a process for notifying the central control station of the address of the terminal station using the LCCH frame is performed (step S68). Here, using the LCCH frame, the global address received by all terminals is put in the DA part in the frame, and the registration request and the self-terminal address are put in the data part and transmitted to the centralized control station. After transmitting the signal, the terminal station receives the LCCH frame while changing the frequency according to the acquired HP (step S69).

When the same address as that of the own terminal cannot be confirmed in the DA part in the received LCCH frame (the answer in step S70 is negative), it is monitored whether or not a predetermined time has elapsed after transmitting the own terminal address. Yes (step S7
4). If the predetermined time has not elapsed (step S7)
If the answer to No. 4 is negative), the processing for receiving the central control station address in the LCCH frame from the central control station is continued in step S69. On the other hand, when it is detected that the predetermined time has elapsed (the answer in step S74 is affirmative), the processing for notifying the central control station of its own terminal address again is performed using the LCCH frame in step S68.

D in the LCCH frame from the central control station
When the own terminal address is detected in the A section and the data indicating the registration is confirmed in the Data section (the answer in step S70 is affirmative), the DA of the LCCH frame is sent to the central control station.
The address of the centralized control station is entered in the section and a signal indicating the completion of startup is entered in the Data section, and the LCCH frame is transmitted (step S71). When the output of the signal is completed, the process proceeds to the intermittent reception process (step S72).

(3) Processing at the time of outside line transmission from the wireless terminal FIG. 16 is an operation sequence diagram at the time of outside line transmission, FIG. 17 is an operation flowchart of the network control device 1 at the time of outside line transmission, and FIG. 10 is an operation flowchart of 10.

16 to 18, when the user performs a call operation by pressing the call key or a combination of off-hook and dial on the wireless terminal 10 (step S9).
When the answer of 1 is affirmative), the wireless terminal 10 determines whether HP has already been acquired (step S92), and when HP has already been acquired, immediately transmits a connection request (step S95). On the other hand, if HP allocation is required,
An HP acquisition request (61) is transmitted to the central control station to acquire the HP required for wireless communication (step S9).
3).

The HP acquisition request includes the type of wireless communication (voice / voice).
Data) is added as a parameter. 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 10 by an HP notification (62). Upon receiving the HP notification (step S94), the wireless terminal 10 stores the HP and uses it to send a connection request (63) to the network control device 1 (step S94).
95). When the network control device 1 receives the connection request (the answer in step S81 is affirmative), the state of the wireless line is checked, and if the connection is possible, the connection confirmation (64) is transmitted (step S82).

When the wireless terminal 10 receives the connection confirmation (step S96), it recognizes that the link establishment of the wireless line is permitted, synchronizes with the voice channel, and transmits the outside line transmission (66) to the network control device 1 (step S96). S97), and then a voice communication path is connected to establish a call (step S98). The dial of the other party is included as a parameter at the time of the outside line transmission, and the LCC of the radio frame shown in FIG. 5 on the radio link between the radio terminal 10 and the network control device 1.
Sent at H.

When the network controller 1 receives the outside call (66) (step S83), it determines whether the outside call is possible. If the public network line 2 is available and you can make a call,
The public network line 2 is supplemented (step S84). After supplementing the public network line 2, dial tone (6
When 7) is detected, the dial (68, 69) transmitted from the wireless terminal 10 by the outside line transmission is started to be transmitted to the public network line 2 (step S85). When all digits have been transmitted and the dial transmission is completed (step S86), the communication path with the public network line 2 is connected to establish a communication (step S87). When the public network line 2 receives the dial and calls the other party, a ringback tone (70) is transmitted from the public network line 2 so that the wireless terminal 10 can listen. When the other party answers, the ringback tone stops and you are talking (71).
Becomes

When the call ends and the disconnection operation (for example, on-hook) is performed on the wireless terminal 10 (step S99), the on-hook (72) is transmitted (step S100).
The network control device 1 receives the on-hook (step S8).
8), the public network line 2 is disconnected (step S89), and a disconnection confirmation (73) is transmitted to the wireless terminal 10 (step S9).
0). Upon receiving the disconnection confirmation, the wireless terminal 10 opens the communication path (step S101) and ends the communication processing. After that, when the predetermined time further elapses (step S102),
The wireless terminal 10 requests the central control station to release the HP (7
4) is transmitted (step S103). When the central control station normally receives the HP release request and performs the HP release processing,
Send HP Release (75). When the wireless terminal 10 receives the HP release (75) (step S104), the HP release processing ends.

(4) Processing when an external line is received by a wireless terminal (4.1) Operation of network control device FIG. 19 is a sequence diagram when an external line is received, and FIG. 20 is an operation flowchart of the network control device 1 when an external line is received. First,
When there is an incoming call (81) from the public network line 2 (step S111), the network control device 1 has already acquired the HP to be used for communication (step S11), as in the case of making an outside line.
2 is affirmative), the process proceeds to step S115 described later, and H
If P needs to be acquired (the answer in step S112 is negative), the HP to be used for the call to the central control station from now on.
An acquisition request (82) is transmitted (step S113). Upon receiving the HP acquisition request, the centralized control station selects an HP that is not currently used from the HP table managed by itself, and sends an HP notification (83) to the network control device 1. Along with this, the network control device 1 receives the HP information (step S114).

Next, the network control device 1 uses the two wireless terminals 10
An outside line incoming signal (84) is transmitted to (A, B) (step S115). When the wireless terminal 10 (A) goes off-hook and the network control device 1 receives the off-hook signal (85) (step S116), the HP or the like used for the outside line call to the wireless terminal 10 (A) that has transmitted the off-hook signal. The connection request signal (86) carrying the information of (1) is transmitted (step S
117). When the network control device 1 receives the connection confirmation signal (87) (step S118), it notifies the centralized control station that the connection with the wireless terminal 10 has been completed (88) (step S119). Further, the network control device 1 transmits the call-in-progress display signal (89) to the wireless terminal 10 (A) (step S120), and sends an outside line call termination signal to the other wireless terminals 10 (wireless terminal 10B in this example). (90)
Is transmitted (step S121). And the wireless terminal 1
0 (A) is connected to the public network line 2 to start a call (step S122).

Further, the network control device 1 uses the wireless terminal 10 (A).
The connection with the public network line 2 is continued until the on-hook signal (91) is received from (step S123). When the on-hook signal (91) is received, the line disconnection signal (9
2) is transmitted and the connection between the public network line 2 and the wireless terminal 10 (A) is stopped (step S124). Further, to the other wireless terminal 10 (B), an outside line busy display stop signal (93)
Is transmitted (step S125). After the end of the call with the outside line, during the predetermined time period (step S126), if there is no next outside line incoming, the network controller 1 sends the HP to the central control station in the call. A signal (94) requesting the release of is transmitted (step S127). The centralized control station updates the HP management table and sends an HP release confirmation (95) to the network control device 1 (step S12).
8).

(4.2) Operation of Radio Terminal FIG. 21 is an operation flowchart of the radio terminal 10 when an external line is received. 21 and FIG. 19 described above, the wireless terminal 1
When 0 receives the outside line incoming signal (84) from the network control device 1 (step S131), the wireless terminal 10 sounds a ring tone or the like to detect whether or not it is off-hook (step S132). When the wireless terminal 10 (A) goes off-hook, an off-hook signal (85) is transmitted to the network control device 1 (step S133). HP from the network controller 1
If the connection request signal (86) including the information such as the above can be received (step S134), the connection confirmation signal (87) is returned (step S135).

Call display signal (89) from the network controller 1.
If the wireless terminal 10 (A) receives the
(Refer to FIG. 2 above) A call display is displayed (step S13).
6) The call is started (step S137). Further, the call is continued until the on-hook is made (step S138), and when the on-hook is made, the on-hook signal (91) is transmitted to the network control device 1 (step S139). When the line disconnection signal (92) is received (step S140), the line is disconnected and the in-call display on the display unit 22 is erased to end the call.

On the other hand, since another wireless terminal 10 (A) has started a call before the wireless terminal 10 is off-hooked, an outside line incoming call stop signal (9) is sent to the wireless terminal 10 (B).
0) has come (step S141), the display unit 22
The outside line in-use display is displayed (step S142). Furthermore,
The wireless terminal 10 (B) uses the outside line display stop signal (93)
When the outside line busy display is continued on the display unit 22 until the display comes, and the outside line busy display stop signal is received (step S14).
3), the outside line in-use display on the display unit 22 is erased (step S144).

(5) Processing of Extension-to-Extension Call Next, assuming that an extension-to-extension call (voice communication) is carried out by two terminal stations, each of the calling-side wireless telephone and the called-side wireless telephone will be described. The operation will be described. In this case, it is assumed that two wireless telephones 3 perform inter-extension communication, and the calling side is 3A,
The called party is 3B.

FIG. 22 is a sequence diagram of control data of the centralized control station, terminal station A (calling side), and terminal station B (calling side). FIG. 23 is an operation flowchart of the centralized control station during extension communication. FIG. 25 is an operation flowchart of the calling side terminal station during extension communication, and FIG. 25 is an operation flowchart of the called side terminal station during extension communication.

22 to 25, when the user presses the extension key arranged in the key matrix 21 (see FIG. 2 above) of the wireless telephone 3A (step S160),
When the wireless telephone 3A has already acquired the HP used for communication (the answer in step S162 is affirmative), the step S described later is performed.
If the HP is required to be acquired (No at step S162), the HP acquisition request signal (101) is transmitted by the HP for control data communication using the LCCH (step S163).

When the centralized control station judges that the signal has been received (step S151) and judges that the signal is an HP acquisition request (step S152), it confirms whether or not there are HP resources (step S155). . If it is determined that there are HP resources (the answer in step S155 is affirmative), the HP is secured for the HP acquisition request (step S
156), and notifies the HP (step S157).

When the wireless telephone 3A determines that it has received the HP notification (102) (step S164), the wireless telephone 3A itself allows the user to hear the dial tone (DT) as communication (step S165). On the other hand, when the centralized control station determines that there is no HP resource (the answer in step S155 is negative), it sends a communication failure notification (step S158), and the wireless telephone 3A that has received the notification cannot communicate with the user. The effect is notified by sound or display (step S181).

The user of the wireless telephone 3A who receives the dial tone inputs the information (address) indicating the wireless telephone 3A as the call destination from the key matrix 21 (stop the dial tone). The wireless telephone 3A waits for the other party to be designated (step S166), and requests connection to the wireless telephone 3B using the LCCH on the HP for control data communication (103).
Is transmitted (step S167). At that time, the HP information previously assigned by the central control station is also notified.

The wireless telephone 3B is an HP for control data communication.
When receiving a connection request (103) signal at step S191 (step S191), a connection confirmation (104) is sent to the other party (caller) who sent the connection request signal by the HP for control data communication using the LCCH. To send (step S
192). After that, the wireless telephone 3B switches the HP so as to communicate using the HP notified from the wireless telephone 3A.

Upon receiving the connection confirmation (104) (step S169), the wireless telephone 3A sends a connection completion (105) signal to the central control station by the LC for control data communication.
It transmits using CH (step S170). As a result, the central control station knows that a wireless link has been established between the extensions. When a wireless link is established between extensions, the wireless telephone 3
A switches the HP to the HP assigned by the centralized control station, and transmits a call setting (106) signal to the wireless telephone 3B. The wireless telephone 3A also transmits the call setting signal with the address of the wireless telephone 3B added (step S17).
1), ring back tone (RBT) from speaker 20
To the user to notify that the call is being made (step S168).

Upon receiving the call setting (step S193), the radio telephone 3B on the called side makes a sound (ring tone) from the speaker 20 or displays on the display unit 22 to notify the incoming call (step S194). Prompt the user of the telephone 3B for a response. As a result, when the user of the wireless telephone 3B performs a response operation using the key matrix 21 (step S19).
5), the wireless telephone 3B sends the response (107) to the wireless telephone 3
The address of A is added and transmitted (step S19).
6). At this point, the wireless telephone 3B is in the call state (step S197), stops the notification of the incoming call, and stops the speaker 20.
And the microphone 19 are connected to prepare for a call. At this time,
The display unit 22 may display the address of the calling-side wireless telephone 3A.

On the other hand, when the wireless telephone 3A receives the response (107) from the wireless telephone 3B (step S17).
1), the ringback tone is stopped, the speaker 20 and the microphone 19 are connected, and a call is in progress (step S17).
2). The wireless telephone 3A monitors whether the user performs an operation for ending the call such as on-hook or receives a release (109) from the wireless telephone 3B (step S17).
3) Further, the wireless telephone 3B also monitors whether or not the user performs a call end operation such as on-hook or receives a disconnection (108) from the wireless telephone 3A (step S198).

When the user of the wireless telephone 3A performs an operation for ending the call, the wireless telephone 3A transmits disconnection (108) (step S174) and disconnects the speaker 20 and the microphone 19. On the other hand, the wireless telephone 3B disconnects (10
When 8) is received, the microphone 19 is disconnected, and the speaker 20 stops the voice output from the other party and outputs a busy tone instead to notify the user that the other party has disconnected the call (step). S199), and prompts the user to also go on-hook with the wireless telephone 3B.

The wireless telephone 3B waits for the user to perform the on-hook operation (step S200), and then releases (109).
Is transmitted (step S201), and the call ends. When the wireless telephone 3A receives the release (109) (step S
175), it is determined that the call is completely terminated, and then a release request (110) for disconnecting the wireless link is transmitted (step S176). Upon receiving the release request (110) (step S202), the wireless telephone 3B transmits a release confirmation (111) (step S203), stops the transmission of radio waves, disconnects the wireless link, and ends the call. Upon receiving the release confirmation (111) (step S177), the wireless telephone 3A switches the frequency to the HP for transmitting control data and waits until the next control command is transmitted / received.

After receiving the release confirmation (111) and before a predetermined time elapses (step S178), the wireless telephone 3
When there is no next call request from A, the HP release request (112) held by the wireless telephone 3A is transmitted to the centralized control station (step S179). When the central control station determines that the release request has been received (step S15)
3), the HP is released, and the HP release notification (113) is transmitted to the wireless telephone 3A (step S154). Upon receiving the HP release notification (113) (step S180), the wireless telephone 3A confirms that the HP has been released.

By the above procedure, the frequency hopping pattern allocation method according to the first embodiment can be realized even in a direct call between extension lines.

As described above, according to the first embodiment, the centralized control station manages the hopping pattern used in the system during the outside call and the extension call by voice, and the wireless communication terminal communicates. Even after the end, the assigned hopping pattern is stored for a predetermined time, and if the communication is to be performed again within the predetermined time, the stored hopping pattern is used again to perform communication. It is possible to eliminate the overhead time for allocating the hopping pattern, which can shorten the waiting time of the user of the wireless communication terminal and reduce the communication traffic (load) of the wireless communication system. it can.

[II] Second Embodiment “Data Communication Process between Wireless Terminals” In the first embodiment, the wireless terminal 10 and the wireless telephone 3 are taken as an example to perform an outside call and an extension call by voice. The operation when performing data communication has been described, but in the second embodiment, the operation when performing data communication by the data terminal will be described. Since the configuration of the wireless communication system is the same as that of the first embodiment, the description thereof will be omitted.

FIG. 26 is a sequence diagram of data communication, FIG.
7 is an operation flowchart of the wireless terminal 10 at the time of connection in the data communication, FIG. 28 is an operation flowchart of the communication terminal at the time of transmitting data, FIG. 29 is an operation flowchart of the communication terminal at the time of receiving data, and FIG. 6 is an operation flowchart of the wireless terminal 10.

26 to 30, the wireless terminal 10
When the transmission operation is performed at the originating terminal station (step S211), it is first determined whether HP has already been acquired (step S212). If HP has already been acquired, the process proceeds to step S125, which will be described later, and HP If it is necessary to acquire the HP, an HP acquisition request (121) is sent to the central control station.
Is transmitted (step S213), and HP is sent from the central control station.
The notification (122) is acquired (step S214).

Next, the calling terminal station transmits a connection request (123) to the called terminal station, and the HP for use in the communication previously assigned (or stored) by the central control station is used. Notify (step S215). When the connection confirmation (124) is received from the receiving terminal station (step S21)
6) The connection completion (125) is transmitted to the central control station, and the call setup is completed (step S217). When the call setup is completed, data communication is performed next. In the second embodiment, data transmission from the transmitting terminal station will be described.

When communication is started, the transmitting terminal station first resets the transmission counter to zero (step S221).
Next, it is checked whether or not there is a retransmission request (127) from the wireless side (step S222). If there is no retransmission request (127), it is checked whether or not there is a data transmission request from the terminal (step S227). If there is a transmission request, the requested data number is put in the transmission counter (step S22).
8) The data 126 of the number in the transmission counter is received (step S229). On the other hand, when the retransmission request (127) is received, the number of the retransmitted data is designated (step S223), and the data of the designated number is transmitted (step S224).

When the number of the designated data is smaller than the data of the transmission counter (the answer in step S225 is negative), the data of the next number is designated (step S22).
6) Transmit the designated data (step S22)
4). On the other hand, if the number of the designated data matches the number of the transmission counter (the answer in step S225 is affirmative), the normal transmission state is restored. If a disconnection request is received from the terminal (step S230), the transmission is ended.

When communication is started, the receiving terminal station first resets the reception counter to zero (step S231).
When the data is received (step S232), it is checked whether or not the data has an error (step S233). If there is no error in the data, then the data number is checked (step S234), and it is checked whether the data number is next to the reception counter number (step S235). If the data has been correctly received in order, the data is transmitted to the terminal (step S237), and the data number is put in the reception counter (step S238). On the other hand, if there is an error in the data or the data number is missing and the data has not been received in order, a retransmission request (127) is transmitted (step S236). When the disconnection request is received from the terminal (step S230), the reception is ended.

When the originating terminal station receives the disconnection request and shifts to the disconnection sequence (step S241), it transmits a line disconnection notification (128) to the receiving terminal station (step S24).
2). Upon receiving the line disconnection confirmation (129) (step S243), the transmitting terminal station switches the frequency to the HP for transmitting control data and waits until the next control command is transmitted / received. After this, until a predetermined time elapses (step S
244), if there is no next call request from the calling terminal station, an HP release (130) is transmitted to the central control station in order to release the held HP (step S24).
5). When the HP release confirmation (131) is received (step S246), it is confirmed that the HP has been released.

As described above, according to the second embodiment, at the time of data communication, the central control station manages the hopping pattern used in the system, and the wireless communication terminal is allocated even after the communication is completed. The hopping pattern that has been generated for each communication is stored because the hopping pattern is stored for a predetermined time, and when the communication is tried again within the predetermined time, the stored hopping pattern is used again for communication. It is possible to eliminate the overhead time for the wireless communication terminal, thereby shortening the waiting time of the user of the wireless communication terminal and reducing the communication traffic (load) of the wireless communication system.

[0099]

As described above, according to the invention of claim 1, the frequency hopping pattern allocating method is used when the wireless communication terminal issues a communication request and the hopping pattern used for communication is not allocated. The process of requesting the centralized control terminal to allocate the hopping pattern, the process of the centralized control terminal searching for an unused hopping pattern in the system based on the allocation request, and the request of the unused hopping pattern searched by the centralized control terminal. Eliminating the overhead time for allocating hopping patterns, which has conventionally occurred for each communication, because it has a process of notifying a wireless communication terminal that has performed communication and a process of registering the hopping pattern notified by the centralized control terminal as being in use. This reduces the waiting time for users of wireless communication terminals. It is Rukoto, it is possible to reduce the communication traffic of a wireless communication system (load).

According to the invention of claim 2, in the frequency hopping pattern allocation method according to claim 1, the wireless communication terminal requesting allocation of the hopping pattern is allocated from the centralized control terminal until a predetermined time elapses from the end of communication. The method according to claim 1, which has a step of storing the hopping pattern stored therein and a step of starting communication using the stored hopping pattern when the wireless communication terminal again requests a communication within a predetermined time. Similarly to the above, it is possible to eliminate the overhead time for allocating the hopping pattern, which has conventionally occurred for each communication, and thereby, it is possible to shorten the waiting time of the user of the wireless communication terminal and at the same time, the wireless communication system. It is possible to reduce the communication traffic (load).

According to the invention of claim 3, in the frequency hopping pattern allocating method according to claim 1, when the radio communication terminal requesting the allocation of the hopping pattern has passed a predetermined time from the end of communication, the centralized control terminal is provided with the Since the centralized control terminal has the step of requesting the release of the allocated hopping pattern and the step of re-registering the hopping pattern requested for release based on the release request as unused, the conventional method is the same as the invention of claim 1. It is possible to eliminate the overhead time for allocating the hopping pattern generated for each communication, which can reduce the waiting time of the user of the wireless communication terminal and reduce the communication traffic (load) of the wireless communication system. )
Can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a wireless communication system according to first and second embodiments of the present invention.

FIG. 2 is a block diagram showing an internal configuration of a wireless telephone according to the first and second embodiments.

FIG. 3 is a block diagram showing an internal configuration of a wireless adapter according to the first and second embodiments.

FIG. 4 is a block diagram showing an internal configuration of a network control device according to the first and second embodiments.

FIG. 5 is an explanatory diagram showing a configuration of channels in a radio frame according to the first and second embodiments.

FIG. 6 is an explanatory diagram showing an internal configuration of each channel of a radio frame according to the first and second embodiments.

FIG. 7 is an explanatory diagram showing an example of frequency hopping according to the first and second embodiments.

FIG. 8 is an explanatory diagram showing a frequency usage state in each channel of a radio frame according to the first and second embodiments.

FIG. 9 is a sequence diagram showing HP allocation according to the first embodiment.

FIG. 10 is a flowchart showing HP allocation processing according to the first embodiment.

FIG. 11 is a flowchart showing HP release processing according to the first embodiment.

FIG. 12 is a sequence diagram when power is turned on between the centralized control station and the terminal station according to the first embodiment.

FIG. 13 is a flowchart showing an operation at power-on in the centralized control station according to the first embodiment.

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

FIG. 15 is a flowchart showing an operation at power-on in the terminal station according to the first embodiment.

FIG. 16 is a sequence diagram of a voice field at the time of making an outside line call according to the first embodiment.

FIG. 17 is a flowchart showing an operation of the network control device at the time of making an outside line call according to the first embodiment.

FIG. 18 is a flowchart showing an operation of the wireless terminal when making an outside line call according to the first embodiment.

FIG. 19 is a sequence diagram when an outside line arrives according to the first embodiment.

FIG. 20 is a flowchart showing an operation of the network control device when an outside line is received according to the first embodiment.

FIG. 21 is a flowchart showing the operation of the wireless terminal when an outside line is received according to the first embodiment.

FIG. 22 is a sequence diagram of extension communication according to the first embodiment.

FIG. 23 is a flowchart showing an operation of the centralized control station at the time of extension communication according to the first embodiment.

FIG. 24 is a flowchart showing an extension calling operation of the terminal station according to the first embodiment.

FIG. 25 is a flowchart showing an extension incoming operation of the terminal station according to the first embodiment.

FIG. 26 is a sequence diagram of communication between data terminals according to the second embodiment.

FIG. 27 is a flowchart of connection communication between data terminals according to the second embodiment.

FIG. 28 is a flowchart of data transmission according to the second embodiment.

FIG. 29 is a flowchart of data reception according to the second embodiment.

FIG. 30 is a flowchart of communication disconnection between data terminals according to the second embodiment.

[Explanation of symbols]

 1 network control device 2 public network line 3 wireless telephone 4-9 wireless data terminal

Claims (3)

[Claims] 1. A frequency hopping pattern allocation method in a wireless communication system in which a plurality of wireless communication terminals and at least one centralized control terminal perform spread spectrum communication using frequency hopping. A step of requesting allocation of a hopping pattern to a centralized control terminal when a hopping pattern used for communication is not allocated, and a step of searching an unused hopping pattern in the system based on the allocation request by the centralized control terminal, The centralized control terminal has a step of notifying the searched unused radio hopping pattern to the wireless communication terminal that has made the allocation request, and a step of registering the notified hopping pattern as being in use by the centralized control terminal. Frequency hopping pattern allocation Method. 2. The frequency hopping pattern allocation method according to claim 1, wherein the wireless communication terminal requesting allocation of the hopping pattern stores the hopping pattern allocated from the centralized control terminal until a predetermined time has elapsed from the end of communication. A frequency hopping pattern allocating method, comprising: a step of preserving and a step of starting communication using the stored hopping pattern when the wireless communication terminal issues a communication request again within the predetermined time. 3. The frequency hopping pattern allocation method according to claim 1, wherein the wireless communication terminal requesting the allocation of the hopping pattern allocates the allocated hopping pattern to the centralized control terminal when a predetermined time has elapsed from the end of communication. A frequency hopping pattern allocation method, comprising: a step of requesting release and a step of re-registering the release-requested hopping pattern as unused by the central control terminal based on the release request.