JPH09200181A - Wireless communication system - Google Patents

Abstract

(57) [Abstract] An object of the present invention is to accommodate a required number of terminals without limiting the number of terminals accommodated by the number of hopping patterns, and even if the number of hopping patterns that can be secured decreases due to deterioration of the radio environment, etc. Provided is a wireless system capable of sufficiently securing usable terminal stations. SOLUTION: A wireless data terminal station 1 that has become a central control station
04 receives, for example, a homing pattern (HP) allocation request from the wireless telephone 103, and then assigns the HP
If there is not, the HP already assigned to the other terminal station is redundantly assigned to the wireless telephone 103, and the fact that the HP is redundantly assigned is notified to all the terminal stations.
After that, the central control station receives the call confirmation from the wireless telephone 103, grants the call permission to the wireless telephone 103, and receives this call permission only when there is no other terminal station that is communicating using this HP. The wireless telephone 103 starts communication using this HP.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication system using a spread spectrum communication system based on a frequency hopping system, and in particular, when a communication is multiplexed by a hopping pattern, all usable hopping patterns are terminal stations. It relates to the processing when it is used by being assigned to.

[0002]

2. Description of the Related Art Conventionally, a wireless communication system of this type includes a centralized control station for managing / controlling communication between terminal stations accommodated in the system, such as a simple portable telephone system (PHS), and a plurality of terminal stations. Is a system in which terminal stations perform wireless communication using wireless frames based on control data designated by the centralized control station. In this wireless communication, a plurality of base frames (BF) are determined, and in each base frame, a first hopping pattern (hereinafter sometimes abbreviated as HP), a second HP,
The third HP ... decides which frequency to use,
Also, do not use the same frequency in the same base frame,
Always use different frequencies, one radio frame exists in one base frame, and each HP changes the frequency in a predetermined order for each frame, that is, each time the base frame ends. We use spread spectrum communication.

In such a radio communication system using the conventional spread spectrum communication system of the frequency hopping system, by having a plurality of hopping patterns, the communication can be multiplexed by the number thereof. However, when such a multiplexing method is adopted, the number of terminal stations that can be accommodated in the system is the number of hopping patterns (the number of multiplexing).
The number of terminal stations that can be accommodated is limited by the number of hopping patterns. This has the drawback that it cannot be used when you want to use more terminal stations than the number of hopping patterns used in the system, and the number of hopping patterns used in the system is sufficient for reasons such as deterioration of the radio environment. However, there is a problem that the number of usable terminal stations is extremely reduced when it cannot be secured.

[0004]

As described above, in the conventional wireless communication system, when the communication is multiplexed by the hopping pattern, the number of terminal stations that can be used in the system is limited by the number of the hopping patterns. There is a problem that it cannot support when you want to use more terminal stations than the number of patterns, and if you cannot secure the number of hopping patterns used in the system sufficiently due to deterioration of the radio environment, etc. There was a problem that the number of terminal stations that could be created was extremely reduced.

Therefore, the present invention has been made in order to solve the above problems, and it is possible to accommodate the required number of terminals without limiting the number of terminals accommodated by the number of hopping patterns, and to prevent the deterioration of the radio wave environment. It is an object of the present invention to provide a wireless communication system that can sufficiently secure usable terminal stations even if the number of hopping patterns that can be secured is reduced.

[0006]

According to a first aspect of the present invention, a centralized control station assigns a preset hopping pattern to a plurality of terminal stations accommodated in a system, and a hopping assigned by the centralized control station. In a wireless communication system having a terminal station that performs wireless communication using a pattern, when there is a new hopping pattern allocation request from the terminal station, this terminal station duplicates the hopping pattern already allocated to another station. It is characterized in that the central control station is provided with a duplicate allocation means for allocating.

According to a second aspect of the present invention, a centralized control station assigns a preset hopping pattern to a plurality of terminal stations accommodated in the system, and wireless communication using the hopping pattern assigned by the centralized control station. In a wireless communication system having a terminal station that performs, when there is a new hopping pattern allocation request from the terminal station, an overlapping allocation unit that redundantly allocates a hopping pattern already allocated to another station to this terminal station, Notifying means for notifying that the hopping pattern assigned to all terminal stations to which the hopping pattern has been assigned by this duplication assigning means overlaps with other stations, and the origination from the terminal station to which the hopping pattern has been assigned , The hopping pattern assigned to this terminal station Only when it is not used by the terminal station, the central control station is provided with a call permission means for notifying the terminal station of permission to make a call, and a call is made using a hopping pattern that is assigned redundantly. At this time, only when the call confirmation means for making an inquiry to the central control station for permission to make a call and the call permission notified by the call confirmation means of the central control station are received as a result of the inquiry by the call permission means. , The call control means for starting a call using the overlappingly assigned hopping pattern is provided in the terminal station.

According to a third aspect of the present invention, the central control station is provided with a detecting means for detecting whether or not all preset hopping patterns have already been assigned to the terminal station on a one-to-one basis. Only when it detects that the hopping pattern has been assigned to the terminal station, the duplication allocating means assigns a new hopping pattern allocation request from the terminal station, and the duplication allocating means assigns this terminal station to another station. The feature is that overlapping hopping patterns are assigned.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram showing the configuration of an embodiment of the present invention. In the figure, 101
Accommodates the public line 102, and the terminal station 103 in the system
To 109 for providing a public network communication service,
Reference numeral 103 denotes a wireless telephone that exchanges control data or voice data with the network control device 101 or another terminal station, performs voice communication via the public line 102, and performs so-called inter-extension communication between a plurality of terminal stations. , 104 to 109 are network control devices 1
01 or another wireless terminal for performing control data communication and data communication with other terminal stations.

Note that, hereinafter, the terminal stations of the wireless telephone 103 and the wireless data terminals 104 to 109 are collectively referred to as a wireless terminal 110.
(General number from 103 to 109). Further, the wireless data terminal 104 is a terminal device (data terminal) having a function of transmitting and receiving data in a burst, or a device to which a data input / output device and a wireless adapter for wireless communication are connected, or they are integrated. Pointing to terminal equipment,
For example, a computer 104, a multimedia terminal 105, a printer 106, a facsimile 107,
In addition to the copying machine 108 and the LAN gateway 109, devices such as an electronic camera, a video camera, and a scanner are applicable.

The present wireless communication system as described above manages / communicates communication between the wireless terminals 110 accommodated in the system.
It is composed of a centralized control station (for example, one of the wireless terminals 110) to be controlled and a terminal station (the rest of the wireless terminal 110), and the terminal stations 110 use the wireless frame of the wireless communication system described later to perform centralized processing. Wireless communication is performed based on the control data specified by the station. In addition, in this central office,
There can be any one (or more) of the wireless terminals 110 in the system. Further, the wireless telephone 103 and the wireless data terminal 104 can freely communicate with each other, and at the same time, the network controller 1
The public line 102 can also be accessed via 01.

The individual wireless terminals 110 that compose the present wireless communication system shown in FIG. 1 will be described in detail below. FIG.
2 is a block diagram showing an internal configuration of the wireless telephone 103 shown in FIG. 1. FIG. Reference numeral 201 denotes a main control unit that controls the entire control of the wireless telephone 103, 202 denotes a ROM storing a control program of the main control unit 201, a calling code (system ID) of the wireless communication system, and a sub ID of the wireless telephone. A memory including an EEPROM and a RAM serving as a work area for controlling the main control unit 201.
Is a speech path unit for interfacing the input / output blocks of the handset 208, the microphone 209, and the speaker 210 with the ADPCM codec 204. 204 converts the analog voice information from the speech path unit 203 into ADPCM code, and performs ADPCM coding. 205 is an ADPCM codec for converting the converted information into analog voice information.
This is a channel codec section that performs processing such as scrambling on encoded information and time-division-multiplexes into a predetermined frame. The data assembled by the channel codec unit 205 into a wireless frame, which will be described later, is transmitted to the centralized control station and the target terminal station via the wireless unit 207.

Reference numeral 206 denotes a radio control unit for performing transmission / reception and frequency switching of the radio unit 207, carrier detection, level detection, and bit synchronization, and 207 modulates digital information from the channel codec unit 205 and converts it into a format capable of radio transmission. And a radio unit for demodulating the information wirelessly received from the antenna and converting it into digital information. Reference numeral 208 denotes a handset for inputting / outputting a call voice signal, 2
Reference numeral 09 is a microphone for collecting and inputting a voice signal, 210 is a speaker for amplifying and outputting a voice signal, 211 is a key matrix composed of function keys such as dial keys for inputting dial numbers, outside line keys, hold keys and speaker keys, 212 Is a display unit such as an LCD for displaying dial numbers input from the key matrix 211 and the usage status of public lines.

The wireless data terminals 104 to 109 shown in FIG. 1 have a wireless adapter connected or built therein.
FIG. 3 is a block diagram showing the internal configuration of this wireless adapter. Reference numeral 301 denotes a data terminal or printer typified by a computer, or peripheral equipment typified by a facsimile.
Reference numeral 02 denotes a wireless adapter that can be connected to a data terminal or a peripheral device via a communication cable or an internal bus, 30
Reference numeral 3 is included in the wireless adapter 302, which modulates the digital information from the channel codec unit 308 and converts it into a format capable of wireless transmission and sends it to the antenna, and demodulates the information wirelessly received from the antenna and converts it into digital information. A wireless unit 304 is a main control unit including a CPU, peripheral devices that perform interrupt control and DMA control, an oscillator for a system clock, and the like, and controls each block in the wireless adapter 302.

A memory 305 is composed of 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, 306.
Is a communication interface unit, which is equipped with a data terminal or peripheral device such as 301 described above, for example,
It controls the wireless adapter 302 for communication by using a communication interface such as RS232C, Centronics, LAN, or an internal bus of a personal computer or a workstation, such as an ISA bus or a PCMCIA interface. Reference numeral 307 is a timer that provides timing information used by each block inside the wireless adapter 302, and 308 is a channel codec section. In addition to assembling and disassembling the wireless frame as shown in FIG. , CRC, simple error detection process, scramble process, radio section 303
And so on. Reference numeral 309 denotes a wireless control unit, and the wireless unit 3
Control of transmission / reception of 03, frequency switching, etc.
It also has the functions of carrier detection, level detection, and bit synchronization. An 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 into the communication data to convert the data into data. In addition to providing redundancy, the bit error occurring in the received data is corrected at the time of reception by calculating the position where the error has occurred and the error pattern by arithmetic processing.

FIG. 4 is a block diagram showing the internal configuration of the network control device 101 shown in FIG. Reference numeral 401 is a main control unit that controls the overall control of the network control device 101, 402 is a ROM that stores a program, a calling code (system ID) of the wireless communication system, and various data for controlling the main control unit 401. In addition, a memory including a RAM or the like that provides a work area for various calculations, 403 is power supply for accommodating the public network line 102, transmission of a selection command, DC loop closure, PCM conversion, control of the public network, reception of a selection command. And a line interface unit for sending a call command and the like. An analog voice signal 404 received by the line interface unit 403 via the public line 102 is ADPCM.
The code is converted into a code and transferred to the channel codec unit 405, and the ADPCM from the channel codec unit 405 is also transmitted.
A to convert encoded voice signal to analog voice signal
This is a DPCM codec section.

Reference numeral 405 denotes a channel codec section for performing scrambling and other processing on ADPCM-coded information and time-division-multiplexing it into a predetermined frame. Data assembled into a radio frame described later by this channel codec section is stored in the channel codec section. It is transmitted to the network control apparatus 101 and the target wireless terminal 110 via the wireless unit 407. Four
Reference numeral 06 denotes a wireless control unit, which controls switching of transmission / reception and frequency switching of the wireless unit 407, and also has functions of carrier detection, level detection, and bit synchronization. 40
Reference numeral 7 modulates the framed information from the channel codec unit 405, converts it into a format that can be wirelessly transmitted and sends it to an antenna (not shown), and demodulates the information wirelessly received from the antenna to perform digital information processing. Radio unit, 40
Reference numeral 8 is a detection unit that detects incoming calls, detects loops, and sends out various tones such as PB signal, dial tone, and ring tone.

Next, the structure of the frames handled by the channel codec units 205, 308 and 405 built in the above-mentioned wireless telephone 103, wireless adapter 302 and network control device 101 will be described. FIG. 26 is a schematic diagram showing a channel configuration inside a frame used in this example. In the figure, CNT indicates a system control channel, LCCH indicates a logical control channel, and voice data is bidirectionally exchanged using two voice channels, and END changes the frequency for frequency hopping in the next frame. This is a channel indicating a guard time for performing. Therefore, such a frame is composed of six channels of CNT, LCCH, two voice channels, a data channel and END inside.

FIG. 6 shows an example of the internal structure of each channel described above. In the figure, CS is a carrier sense time of 12.8 μsec, PR is a 56-bit preamble for bit synchronization acquisition, and SYN is 1 dummy bit + RCR.
31-bit frame synchronization signal defined by the above, ID is RC
63-bit call signal + 1 dummy bit defined by R, UW is a 24-bit unique word (for capturing byte synchronization), BF is 8-bit basic frame (base frame) number information (1 to 20 cycles), WA Is a field in which the system address of a terminal station to be activated among sleep mode terminals is written, 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 / C
S2 is a carrier sense time, and DA is a field for entering a system address. Further, the CRC of the system control channel is the CRC information from BF to Rev, the CRC of the logical control channel is the CRC information for the data, the CRC of the voice channel is the T / R CRC information, and the Data in the logical control channel is the control information. This is the field to write. Data in the data channel is a field for writing data to be transmitted. CF indicates guard time for frequency switching, and T / R indicates B channel information of 32 kbps. However, the numbers written in the figure are
It represents the number of bits and shows an example of the length of each part.

Here, the CNT channel is the network control device 10.
1 is transmitted at the start of each frame, and stations other than the network controller 101 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 a network control device prior to the line connection, and exchanging a hopping pattern allocation release with a central control station when the line is disconnected. For connection or disconnection of the line, the system address of the partner who desires communication is written in the DA field provided in the LCCH channel, and the line is directly exchanged with the partner.

One of the two voice channels is used for transmission and the other is used for reception to realize a voice call. Which of the two is to be used for transmission is determined by meeting with the other party on the LCCH channel that is exchanged when the line is connected. The data channel is an LCCH channel that is exchanged at the time of line connection, and an arrangement is made with the other party to determine how to perform data transmission.

Next, frequency hopping used in the radio system shown in FIG. 1 will be described. FIG. 7 is an explanatory diagram showing an example of frequency hopping. In this figure, a system having eight base frames (hereinafter sometimes abbreviated as BF) and eight frequencies F1 to F8 is used as an example. Each base frame is first
Which HP, the second HP, and the third HP use. As shown in the drawing, each hopping pattern (hereinafter sometimes abbreviated as HP) does not use the same frequency in the same base frame, but always uses different frequencies. Further, one frame shown in FIG. 6 exists in one base frame, and each HP changes the frequency in a predetermined order for each frame, that is, each time the base frame ends.

Next, how the system performs frequency hopping will be described with reference to FIGS. However, the frequency hopping described below is controlled by the main control unit 201 of the wireless telephone 103 or the main control unit 304 of the wireless adapter 302. The hopping pattern in which the centralized control station transmits the system control channel is designated as the first HP in FIG. 7. That is, F1 when BF1 and F1 when BF2
2. When BF3, the frequency is changed for each BF, such as F3 .... All wireless terminals 110 other than the central control station
As shown in FIG. 8, (terminal station), in BF1, first,
In order to receive the system control channel transmitted by the centralized control station, the frequency set in the radio unit 207 (or 303) is set to the frequency F1 used by the first HP in BF1. All wireless terminals 110 other than the central control station establish frame synchronization with the system control channel received here.

The logical control channel for exchanging connection request and disconnection request for communication is exchanged at the same frequency as the system control channel. A terminal station having control data such as communication line connection or communication line disconnection to be transmitted on the logical control channel transmits control data on the logical control channel directly to the other party in the case of the logical control channel. A terminal that does not have control data to be transmitted on the logical control channel always receives the control data because another terminal receives the control data transmitted on the logical control channel. As a result of the reception, if the received control data is not the control data addressed to the own terminal, the received control data is discarded.

The terminal station which is performing voice or data communication changes the frequency in the voice channel and the data channel to the frequency corresponding to the HP assigned in advance by the central control station.
At this time, the same HP as the system control channel and the logical control channel may be assigned depending on the assignment status from the centralized control station. In the example shown in FIG. 8, for the first HP of the system control channel and the logical control channel,
An example is shown in which the second HP is assigned to the voice communication between the terminal stations A and B, and the third HP is assigned to the data communication between the terminal stations A and B. In this example, 3 in 1 frame
The frequency will be changed.

Here, FIG. 7 and FIG. 8 show a state in which the terminal stations A and B communicate with each other at the first HP and the terminal stations C and D communicate with each other at the second HP. Shows. Also,
Terminal station A and terminal station C transmit on the first voice channel of the two, and terminal station B on the second voice channel.
And the terminal station D transmits. When the logical control channel is terminated, the terminal in voice communication, according to the frequency hopping pattern assigned from the system control channel,
The frequency to be changed from the current base frame number is set in the radio section 207 (or 303). In addition, communication control information such as which is to be transmitted on the first voice channel is exchanged with a communication partner in advance, and transmission / reception of the wireless unit 207 (or 303) is controlled based on the communication control information. .

FIG. 9 shows a case where the terminal stations A and C are transmitting on the first voice channel. BF1
In the case of, the terminal station A and the terminal station C change the frequency according to the frequency hopping pattern assigned to each voice communication after the end of the logical control channel. As a result of changing the frequency, since the first HP is assigned to the terminal stations A and B, the frequency did not change, but the terminal stations C and D changed the frequency to F3. The terminal station A and the terminal station C are connected to the wireless unit 207 (or 3
03) is set for transmission, the terminal station B and the terminal station D are set for reception of the wireless unit 207 (or 303), and voice data is exchanged on the first voice channel. At the end of the voice channel, the terminal station A and the terminal station C have the radio unit 207 (or 303).
Is set to reception, and the terminal station B and the terminal station D are
(Or 303) is set to transmission, and voice data is exchanged on the second voice channel.

At the end of the second voice channel, each terminal station prepares a radio unit 207 (or 30) in preparation for the next data communication.
In step 3), the frequency hopping pattern assigned to the data communication and the frequency obtained from the current base frame number are set in the wireless unit 207 (or 303). After the end of the data channel, during END, the system control channel is received by the next BF2, so that the frequency is BF2 by the first HP.
F2, which is the frequency used in
Set to 3). The procedure of frequency hopping after the base frame becomes BF2 is a repetition of the above procedure.

Next, the operation of the station which has become the centralized control station (one of the terminals 103 to 109 shown in FIG. 1) in the wireless terminal 110 shown in FIG. 1 will be described. In order for the wireless communication system to operate, the central control station manages the hopping frequency in the system, and the terminal station (the wireless terminal 110 other than the central control station) has a hopping pattern (HP: Ho).
It is assumed that the centralized control station can allocate the communication channel determined by the pping pattern) and the time slot. The centralized control station manages the HP to be assigned by some voice channel or data channel of BF, and notifies this information to the terminal station in the data area of LCCH.

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 operation of the central control station when it is necessary to manage the communication channel and change the HP, which is the basis for performing the operation, will be described below.

Management of the communication channel in the centralized control station is to allocate an unused HP to the communication data type (voice or data) requested by the terminal station and release it. First, the communication channel management will be described. FIG. 10 is a diagram showing a sequence when the centralized control station allocates HP to the terminal station. In this figure, a sequence is shown 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. However, the sequence or flow chart described below is for the main control unit 20.
1 (or 304), in which case the frame used is the channel codec unit 203 (or 30).
It is assembled according to 8).

The terminal station sends a hopping pattern allocation request to the central control station in sequence S4101 in order to start communication with a particular communication partner station. This HP allocation request includes parameters such as the ID of the communication partner station and the data type. In the central control station, if there is an unused HP of the requested data type, HP allocation is performed in sequence S4.
At 102, it is sent to the terminal station. This request is made when the terminal station starts up and makes a call for the first time. The terminal station stores the once-assigned HP in the memory 202 (or 305), and the stored HP thereafter. connect. The terminal station sends the assigned HP from the wireless unit 207 (or 303) 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 to the centralized control station in sequence S4103.

The centralized control station confirms and manages the usage status of the HP assigned by the above-mentioned parameter of the connection completion notification of the terminal station, and manages the ID of the terminal station and the transmission time in the memory 202.
(Or 305) (corresponding to step 4211 in FIG. 12), and this information is used to determine from which terminal station the HP should be released when the HP runs out. Connection completion notification 4
The terminal station that has transmitted 103 then communicates with the communication partner station using the assigned HP. If the central control station becomes unable to manage the HP for some reason, the
A confirmation is sent to the terminal station in sequence S4107, and the terminal station receives the notification and sends a use HP notification to the central control station in sequence S4107.
4108. When the terminal station does not communicate for a while such as turning off the power, it sends an HP release request in sequence S41.
At 05, it is sent to the central control station. The central control station assigned HP
Change the usage status of the server and confirm the HP release in sequence S41.
At 06, it is sent to the terminal station.

FIG. 11 is a sequence for explaining the HP allocation method when the central control station receives the HP allocation request from the terminal station and there is no HP available in the system. When the central control station receives the HP allocation request from the terminal station in sequence S4111, if there is no HP available in the system, it controls one HP to be used by a plurality of terminal stations, and duplicates the HP. In step S4112, the HP duplication notification is transmitted to the terminal station that is to be used. This HP duplication notification message contains information indicating that duplication is used and HP and time slots. The terminal station that has received the HP duplication notification may always communicate with the centralized control station before starting the communication in order to prevent the communication from being confused by using the same HP with a plurality of terminal stations at the same time. It is necessary to transmit a call confirmation for confirming whether or not the sequence is S4113.

Upon receiving the call confirmation, the central control station checks whether a terminal station using the same HP as the HP used by the terminal station requesting the call confirmation is in communication, and if not communicating. When the call permission is returned to the terminal station in sequence S4114 and the call permission is received, the terminal station sends a connection completion notice to the centralized control station in sequence S4115 after obtaining an agreement to communicate with the partner station with which it wants to communicate. Upon receiving the connection completion notification, the centralized control station puts the HP in use, and if the terminal station to which the HP is redundantly assigned sends a call origination confirmation in sequence S4118 thereafter, rejects the call origination. In sequence S4119, control is returned to the terminal station so that communication is not performed.

FIG. 12 is a flow chart showing the operation of HP allocation in the centralized control station. This figure describes the processing performed on the central control station side from the time when the terminal station requests the HP until the communication starts. When the central control station receives the HP allocation request from the terminal station (step 420)
1) HP table (set in memory 202 or 305) as to whether unused HP of requested data type exists
Check with (step 4202). If there is no unused HP, the processing when the HP described later is used up (HP
(Duplication allocation process) is performed (step 4204). If an unused HP exists, it is temporarily registered in the HP table (step 42).
03), HP temporary allocation is performed to the terminal station (step 420).
Five). The central control station confirms whether or not the terminal station has succeeded in the connection with the communication partner station on the HP temporarily assigned by the connection completion notification from the terminal station (step 4206) (step 4206).
4207) If the connection is not successful, the temporarily allocated HP is unused and registered in the HP table (step 4209), and if the connection is successful, the temporarily allocated HP is registered and used in the HP table (step 4208). After registering the usage status in the HP table (step 4210), the centralized control station sends a connection completion confirmation to the terminal station (step 4211) and terminates the requested HP allocation.

FIG. 15 is a flow chart showing the HP duplication allocation processing of the above step 4204. Allot H
When P disappears, first, the HP with the smallest number of terminal stations that are redundantly allocated is searched from the HP management table that manages the usage status of the HP, and the HP with the lowest degree of overlap is selected. Yes (step 4501). The HP management table includes HP and an allocation flag for each HP, a flag in use, a number of used terminal stations, and a used terminal station ID. this is,
If many terminal stations are duplicated only for a certain HP,
This is because the terminal stations using P often cannot communicate when they want to communicate due to competition. As a method of selecting the HPs to be duplicated, not only the number of terminal stations using the HPs but also the selection frequency of the terminal stations (frequency of use of assigned HPs) is taken into consideration. Good.

Next, based on the HP management table, the terminal station using the selected HP is detected (step 450).
2) It notifies the terminal station and the terminal station that has made the HP allocation request that the HP is redundantly allocated (step 4503). Next, it is checked whether the selected HP has already been assigned redundantly (step 4504), and if it has not been assigned by then, a duplicated flag is set in the selected HP portion of the HP management table (step 4506). On the other hand, if the selected HP is not redundantly allocated in step 4504, the terminal station requesting this HP allocation is added to the HP management table as one of the terminal stations using this HP (step 4505), and the HP redundant allocation is performed. The process ends.

FIG. 13 is a flow chart showing the HP releasing operation in the centralized control station. This flowchart describes the processing performed by the centralized control station when the terminal station releases the allocated HP. The central control station is performing normal processing (step 430).
1) When the HP release request is received (step 4303), the terminal ID and HP included in the request message are confirmed (step 4304), and if the information is incorrect, an error is notified (step 4311). If there is no error, the corresponding HP is searched from the HP management table (step 4305), and the corresponding terminal ID is deleted from the information of that HP (step 4305).
4306) and then checks if there is only one terminal station using the corresponding HP (step 4307), and if it is not one, sends an HP cancellation confirmation to the HP cancellation request terminal (step 430).
8).

If the number is one in step 4307, the duplication flag of the corresponding HP in the management table is cleared (step 430).
9), sends a signal notifying the deduplication of HP to one terminal station using the corresponding HP (step 4310). The terminal station side receives the duplication cancellation signal and substitutes for the HP release confirmation.

Next, the operation of the centralized control station when changing the HP will be described. This is because when a certain frequency in the HP becomes unusable due to a failure such as a narrow band interference, the unusable frequency is replaced with an unused frequency,
This is a function to avoid the obstacle by changing the. There are two ways to change the HP: a case where a change request comes from the terminal station and a case where the central control station directly performs the change request. In response to these requests, the centralized control station modifies the hopping frequency table and sends the NF (Next Frequen
cy) is used to notify each terminal station of a system HP change.

FIG. 14 shows the above-mentioned HP in the central control station.
8 is a flowchart showing a changing operation. When receiving the HP change request from the terminal station, the centralized control station confirms the necessity of the HP change (step 4401). HP will not be changed if the necessity is not recognized. If it is necessary to change the HP, it is confirmed whether or not there is an alternative HP (step 4402). If there is no alternative HP, the HP is not changed. Alternative HP
If it exists, it is checked whether or not the alternative HP is duplicated in a plurality of terminal stations (step 4403), and if it is duplicated, the process proceeds to A in the flowchart of FIG. 13 to perform duplicate allocation processing (step 4404). ), Changing the hopping frequency table, changing the NF in the system control channel, and notifying each terminal station (step 4405). On the other hand, when the central control station directly changes the HP, the presence or absence of the alternative HP is confirmed (step 4402), and the same applies thereafter. In this way, in this system, the central control station manages the change of HP according to the request from the terminal station or the request of the central control station itself, and also performs the duplicate allocation process.

The specific operation of this system will be described below in some cases. First, the processing at power-on will be described. 16 is a sequence of the control station and the terminal station when the power is turned on, and FIG. 16 is a sequence showing the operation of the control station and the terminal station when the power is turned on in this system. When power is turned on and the wireless terminal 110 is initialized in sequence S5101, the wireless terminal 110 determines whether it is a centralized control station or a terminal station and recognizes that it is a centralized control station. Then, the hopping pattern is determined, the synchronization signal, the hopping pattern information, the own area number, and the like are assembled into a frame by the channel codec unit 205 (or 308), and the wireless unit 207 (or 303) as a CNT frame at every predetermined timing. Send.

Similarly, after recognizing that the terminal itself is a terminal station after starting the wireless terminal 110, the address of the terminal itself and the area number of the receiving control station are stored in the memory 202 (or 3).
05). When the processing is completed, the CNT frame from the control station is waited at an arbitrary frequency. When a CNT frame from the central control station is received, the NFR in the frame is received.
Gets the frequency that hops to the next unit time based on. The terminal station changes the reception frequency based on the received frequency and waits for the next CNT frame. The terminal station repeats this process, recognizes the hopping pattern used by the centralized control station, and stores this in the memory 202 (or 305). When the storage of the hopping pattern is completed in the terminal station, the central control station sends the LCCH from the terminal station in S5102.
The frame is used to notify the terminal station that it will newly join as a terminal station.

At this time, the global address received by all terminals is added to the DA of the LCCH frame, and the data indicating that new registration is to be performed is transmitted. When the central control station receives the LCCH frame and the DA in the LCCH frame has a global address, it receives the data in the data section, and if there is a terminal station address and a registration request signal, the terminal station is based on this information. Store the address and register it anew. When this registration is completed, the sequence S51
In 03, 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 central control station by the LCCH frame, the address of the central control station is stored, and after this processing is completed, the start-up is completed for the central control station using the LCCH frame in sequence S5104. Notify me. When the centralized control station receives the startup completion notification from the terminal station, it shifts to normal processing. After outputting the start-up completion notification, the terminal station can make a call from the terminal station in sequence S5105.

Next, the operation of the centralized control station when the power is turned on will be described. FIG. 17 is an operation flowchart when the centralized control station is powered on. When the power of the terminal is turned on (step 5201), the terminal is initialized and put into an operating state (step 5202), and as a result of this processing, the terminal is recognized as a central control station (step 520).
3), processing for storing address information and area information of the terminal itself is performed (step 5204). As means for inputting area information and terminal address information, a value set by a DIP switch or the like at the time of start-up is stored, a value input by a dial key of a telephone or the like, or a computer or the like is stored. A value input by the keyboard may be received and stored via the bus. When this address information is received, it is determined whether the value input in is valid (step 5205), and if it is not valid, the address information is stored again in step 5204.
When it is confirmed that the stored address is valid (step 5205), processing for determining the hopping pattern used in step 5206 is performed (step 5206).

At this time, the centralized control station uses the channel codec section 205 (or 308) to carry out carrier sense on all of the predetermined usable frequencies, and selects a predetermined number of frequencies having the best radio wave condition among them. Use a hopping pattern. As a result of acquiring the hopping pattern (step 5207), if the usable frequency is less than or equal to a predetermined number, it is detected whether carrier sensing is performed for a predetermined time (step 5211). If the operation has not been performed for the predetermined time, the processing for determining the hopping pattern is continued (step 5206). When it is detected that a predetermined time has passed (step 5211), the central control station notifies the fact that the hopping pattern could not be determined by screen display or sound (step 5212). After the processing, if there is a request to determine the hopping pattern again in S5213, the processing for determining the hopping pattern is performed in S5206. If there is no request for retry (step 5213), the fact that the hopping pattern cannot be determined is notified (step 5213).
5212). When the predetermined hopping pattern can be acquired (step 5207), a process for assembling the CNT frame is performed (step 5208).

The CNT frame is a frame containing a synchronization signal ID, an area number, and frequency information. When the assembly of the CNT frame is completed, the process of transmitting the CNT frame using one frequency of the determined hopping pattern is performed (step 5210), and the determined HP
Based on, the process shifts to a normal process of transmitting a CNT frame while changing the frequency (step 5211).

Next, the operation of the centralized control station when registering a new terminal will be described. FIG. 18 is a flowchart showing the operation of the centralized control station when a new terminal station is registered.
During normal processing (step 5301), the central control station
If the H frame is received (step 5302) and the DA contains an address addressed to the self terminal or all terminals, the received L frame is received.
The control data in the CCH frame is taken out and the command is executed. On the received control day 4, confirmation processing of the terminal station address transmitted together with the registration request is performed. A registration request and a terminal station address confirmation process transmitted to a friend are performed (step 5304).
As a result of checking the terminal station address, when it is detected that the terminal station address is normal (step 5305), the central control station performs a process for registering the terminal station address and stores the address information (step 5306). Step 5305
When it detects that the terminal station address is not normal,
Processing for discarding the registration request received in the CCH frame is performed (step 5310), and normal processing is performed again in step 5301.

When the registration of the terminal station is completed in step 5306, the control of inputting the address of the centralized control station into the DATA section using the LCCH frame and inserting the address of the terminal station into DA and transmitting to the terminal station whose registration is completed Station address transmission processing is performed (step 5307). After transmitting the central control station address in this step 5307, L from the terminal station that has completed registration
When the startup completion notification signal using the CCH frame cannot be confirmed (step 5308), it is detected whether a predetermined time has elapsed (step 5311). If the predetermined time has not elapsed, the terminal station waits for a startup completion notification using the LCCH frame (step 5308). If a predetermined time has passed after the central control station address was notified to the terminal station (step
5311), in step 5307, the LCCH is again sent to the terminal station.
Performs processing for notifying the central control station address using a frame. When the start-up completion notification signal from the terminal station is detected in step 5308, new registration completion processing of the terminal station is performed in step 5309, and the processing shifts to normal processing (step
5309).

Further, the operation of the terminal station when the power is turned on will be described. FIG. 19 is a flowchart showing the operation of the terminal station when the power is turned on. When the power of the terminal is turned on (step 5401), the terminal is initialized and brought into an operating state (step 5402). When the terminal recognizes that the terminal is a terminal station as a result of the processing (step 5403), it performs processing for storing the address information and area information of the terminal itself (step 5404). As the terminal station, central control station determination means, 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 dial key of a telephone or the like is used. It is conceivable to store a value or to receive a value input by a keyboard of a computer or the like via a bus and store it.

When the address information is read, it is determined whether or not the input value is valid (step 5405), and if it is not valid, a process of storing the address information again is performed in step 5404. When it is confirmed that the address stored in step 5404 is valid, processing for acquiring the hopping pattern to be used is performed (step 5406). In this step 5406, since the CNT frame from the centralized control station is received, it shifts to the 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 NFR part in the CNT frame, the terminal station moves the received frequency to that frequency, and waits for the next CNT frame. The terminal station repeats this operation,
It recognizes the centralized control station to which it belongs and also recognizes and memorizes the frequency hopping pattern.

As a result of the hopping pattern acquisition processing in step 5406, if the hopping pattern cannot be acquired (step 5407), a warning sound or screen display is given to the user informing that the hopping pattern could not be acquired. To the user (step 5413) and step 54 again.
At 06, the processing for acquiring the hopping pattern is performed.
When it is detected in step 5407 that the hopping pattern has been acquired, processing for notifying the central control station of the address of the terminal station is performed using the LCCH frame (step 54).
08). Here, using the LCCH frame, a global address received by all terminals is written in DA in the frame, a registration request and its own terminal address are placed in the DATA section, and the control section is transmitted. After transmitting the signal, the terminal station sets S5
The LCCH frame is received while changing the frequency according to the hopping pattern acquired in 409.

If the same address as the own terminal cannot be confirmed in the DA in the received LCCH frame (step 54)
10) After transmitting the own terminal address (step 5414), it is monitored whether a predetermined time has passed (step 5414). 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 (step 5409). When it is detected in step 5414 that the predetermined time has passed, in step 5408, processing for notifying the control terminal of its own terminal address is performed again using the LCCH frame. In step 5410, when the own terminal address is detected in the DA in the LCCH frame from the centralized control station and the data indicating registration in the DATA section is confirmed, the address of the centralized control station is indicated in the DA in the LCCH frame for the control terminal. And a signal indicating the completion of startup is placed in the DATA section to transmit the LCCH frame (step 541).
1). When the output of the signal is completed, the process proceeds to the intermittent reception process (step 5412).

Next, the processing at the time of outside line transmission from the wireless terminal will be described with reference to the outside line transmission sequence diagrams of FIGS.
This will be described with reference to the operation flowchart of the network control device 101 when making an outside line call and the operation flowchart of the wireless terminal 110 when making an outside line call in FIG. In FIG. 22, when the transmission key arranged on the wireless terminal 110 is pressed or the transmission operation is performed by a combination of off-hook or the like and dial (step 5801), it is determined whether HP (hopping pattern) has already been acquired (step 5802). If acquired, the process proceeds to connection request signal transmission (step 5808). If not acquired, the wireless terminal 110 acquires the HP required for wireless communication, and therefore the sequence S5 of FIG.
At 601 an HP acquisition request is transmitted to the centralized control station (step 5803).

The type (voice / data) of wireless communication is added as a parameter to the HP acquisition request, and voice is used as a parameter in this operation. Upon receiving the HP acquisition request, the centralized control station selects a different HP depending on the type and transmits an HP notification to the wireless terminal 110 in sequence S5602. As described above, the HP is acquired only when the wireless terminal 110 makes a call for the first time. The wireless terminal 110 checks whether or not the HP notification is received (step 5804), and if it is received, the connection request is transmitted (step 5804).
5808), if not received, it is checked whether HP duplicate allocation notification is received (step 5805), and if not, communication is not possible is notified (step 5815), and the processing ends.

When the HP duplicate allocation notification is received, a transmission confirmation transmission is sent to the central control station (step 5806), and it is checked whether or not the transmission permission is received as a response (step 580).
7) If not received, a communication failure notification is given (step 581).
Five). When the call permission is received, the connection request is transmitted (step 5808). At that time, the HP is stored.

In FIG. 21, the network controller 101 sends a connection request in the sequence S5603 of FIG.
When receiving from 10 (step 5701), the state of the wireless line is checked, and if it is in the connectable state, sequence S5604.
To send a connection confirmation to the wireless terminal 110 (step 570).
2). On the other hand, when the wireless terminal 110 receives the connection confirmation (step 5809), it recognizes that the link establishment of the wireless line is permitted, synchronizes with the voice channel, and transmits the outside line to the network control device 101 in sequence S5606. It is transmitted (step 5810), the voice communication path is connected, and the call is in progress (step 5811). The dial of the other party is put as a parameter for this outside line transmission, and the wireless terminal 11
0 and the network controller 101 are transmitted on the LCCH of the radio frame shown in FIG.

The network control device 101 having received the outside call (step 5703) in sequence S5610 determines whether the outside call is possible. If the public network line is free and transmission is possible, the public network 102 is captured (step 570).
Four). After capturing, in sequence S5607, the public network 10
When the dial tone from 2 is detected, the dial sent from the wireless terminal 110 by the outside line is transmitted in sequence S5608,
At 5609, transmission to the public network 102 begins. Network control device 1
When 01 transmits all the digits (step 5705) and the dial transmission is completed (step 5706), the communication path with the public network 102 is connected and the communication is in progress (step 5708). Public network 102
When the person receives the dial and calls the other party, the public network 102
Since the ringback tone is transmitted from the sequence S5610, the wireless terminal 110 can listen. When the other party responds, the ringback tone stops and the call is started in sequence S5611. When the call ends and the wireless terminal 110 performs a disconnection operation (for example, on-hook) in sequence S5612 (step 5812), on-hook is transmitted in sequence S5612 (step 5813).

The on-hook is received by the network control device 101 (step 5709), and the network control device 101 sends the public network 10
2 is disconnected (step 5711), and disconnection confirmation is transmitted to the wireless terminal 110 in sequence S5613 (step 571).
1). Upon receiving the disconnection confirmation, the wireless terminal 110 opens the communication path (step 5814). The above is the operation of the network control device 101 and the wireless terminal 110 at the time of making an outside line.
Even if the dials are not transmitted all at once by the outside line transmission but are divided and transmitted to the network control device 101 after the outside line transmission, the present invention is not affected at all.

FIG. 23 shows the case of HP duplication allocation of FIG. 20. In this case, when the duplication allocation is received, the terminal station confirms the call origination in sequence S5914 before calling and receives the call permission in sequence S5915. Network controller 1
01 in step S5903. Others are the same as in the case of FIG.

Next, the processing when an outside line is received by the wireless terminal 110 and the operation of the network control apparatus 101 at that time will be described. FIG. 24 is an external line incoming sequence in the present wireless system, and FIG. 25 is an operation flowchart of the network control device 101 when an external line is incoming. First, when the network control device 101 receives an incoming call from the public network 102 in step S6101 (step 6201), it determines whether HP has already been acquired (step 6202). Step 6203 if not already obtained
In step S610, the network control apparatus 101 requests the central control station to request an HP to be used for a call.
I will do it in 2. The central control station that has received the request for the HP uses the HP table currently managed by the central control station to determine the H
Select P, notify the network control apparatus 101 of the HP in sequence S6103, and the network control apparatus 101 confirms whether or not the HP notification is received (step 6204).
Information is received, and the process moves to an outside line incoming call (step 6204).

If the HP notification has not been received, the flow advances to step 6205 to check if the HP duplicate allocation notification has been received. If not, this process ends. If it is the HP duplicate allocation reception, a call confirmation is transmitted (step 6206), then the call permission reception is checked (step 6207), and if the permission reception is not received, this incoming call processing is terminated, and if the permission reception is received, the outside line is received. Proceeding to the incoming call (step 6208), the network control device 101 transmits an external line incoming signal to the wireless terminals 110A and 110B in sequence S6104. The wireless terminal 110A uses the sequence S61.
When the network control apparatus 101 receives an off-hook signal at 05 (step 6209), the process proceeds to step S6210, and information such as HP used for outside line communication is placed on the wireless terminal 110A that transmitted the off-hook signal. The connection request signal is transmitted in sequence S6106.

When the connection confirmation signal from the wireless terminal 110A is received in step S6106 (step 6211), the process proceeds to step 6212, and the wireless terminal 11 is sent to the central control station.
In step S6108, the fact that the connection with 0 has been completed is notified, and the busy signal is transmitted to the wireless terminal 110A in sequence S6109 (step 6213).
Proceeding to step 6214, an outside line termination cancellation signal is transmitted to the other wireless terminal 110 (here, wireless terminal 110B) in sequence S6110. Then, in step 6215, the wireless terminal 110A is connected to the public network 102 and the call is started.

Further, in step 6216, the network control device 101 sends an on-hook signal from the wireless terminal 110A in sequence S61.
The connection with the public network 102 is continued until it is received at 11. When the on-hook signal is received, the process proceeds to step 6217, the line disconnection signal sequence S6112 is transmitted, and the public network 102 is transmitted.
And the connection of the wireless terminal 110A is stopped. Further step 62
In 18, the outside line busy display stop signal sequence S6113 is transmitted to the other wireless terminal 110B.

Note that FIG. 27 is a sequence showing a case of HP redundant allocation of the external line incoming sequence shown in FIG. 24. In this case, when the redundant allocation is received, the network controller 10
Before sending, the terminal 1 confirms the outgoing call in sequence S6414, receives the outgoing call permission in sequence S6415, and then transmits the outside line incoming to the terminal station in sequence S6404. Others are the same as in the case of FIG.

Next, the operation of the wireless terminal will be described. FIG. 26 is an operation flowchart of the wireless terminal 110 when receiving an outside line. When the wireless terminal 110 receives an outside line incoming signal from the network control device 101 in sequence S6104 of FIG. 24 (step 6301), it makes a ringing tone and detects whether it is off-hook (step 6302). Wireless terminal 110A
If the off-hook signal is received in step 6303, the off-hook signal is sent in step S6105 in the network controller 10.
Send to 1. If the connection request signal 6106 including information such as HP can be received from the network control device 101 (step 6304),
A connection confirmation signal 6107 is returned (step 6305). A call display signal from the network control device 101 indicates a sequence S6109.
110A, the wireless terminal 110A displays the call in progress on the display unit (# Y04) (step 6306) and starts the call (step).
6307).

The call is continued until it is further hooked (step 6308), and when it is hooked, step 63
In 09, the on-hook signal is transmitted to the network control apparatus 101 in sequence S6111. When the line disconnection signal 6112 is received in step 6310, the line is disconnected and the in-call display on the display unit is turned off to end the call.

On the other hand, in step 6311, the wireless terminal 1
Before 10 is off-hook, another wireless terminal 110
When the outside line incoming call stop signal is sent to the wireless terminal 110B in the sequence S6110 because A has started the call, the wireless terminal 110B displays an outside line busy display on the display unit of the wireless terminal 110 (step 6312). Furthermore, the wireless terminal 11
In 0B, the external line in-use display stop signal is in sequence S611.
Continue to display the outside line in use on the display until it comes to 3 (step
6313), when the signal is received, the outside line busy display is turned off in step 6314.

Next, the processing of a telephone call between extensions will be described.
The operation of each of the calling-side wireless telephone and the called-side wireless telephone will be described on the assumption that an extension call (voice communication) is made between two terminal stations. However, two wireless phones 1
In the case of making an extension call at 03, the calling side is 103A and the called side is 103B. 28 and 32 show a sequence of control data of the centralized control station, terminal station A (calling side), and terminal station B (callee side), and FIG. 29 shows an outline processing flowchart of the centralized control station. FIG. 31 shows an outline processing flow of the calling terminal station, and FIG. 31 shows an outline processing flowchart of the called terminal station.
It should be noted that each processing flowchart describes only the portion of processing related to the operation.

In FIG. 30, the extension key arranged on the key matrix 211 of the wireless telephone 103A is pressed (step 6801) and it is still determined to obtain HP (step 68).
02), if not acquired, the wireless telephone 103A is H
The P acquisition request signal is transmitted by the HP of the centralized control station in sequence S6601 using the LCCH (step 680).
3). The central control station determines that it has received the signal (step 6
701), if it judges that the signal is an HP acquisition request (step 6702), it is confirmed whether or not there is an HP resource (step 6705), and if there is, HP is secured for the request (step 6706), and that HP is set. Notify (step 6707). The wireless telephone 103A transmits the HP notification in sequence S6602.
If it is received (step 6811), it is judged that communication is possible, and the dial tone (DT) is heard from the wireless telephone to the user (step 6805).

Further, in the processing of FIG. 29, when the centralized control station (step 6705) determines that there is no resource, the centralized control station performs the same processing as in FIG. 15 and performs the HP duplicate allocation processing. (Step 6708) Then, the terminal station that has been assigned redundantly is notified (step 6709).

When the HP notification is not received, the wireless telephone 10
In the process shown in FIG. 30, 3A checks whether it is the HP duplicate allocation (step 6819), and if not, the wireless telephone 103A notifies the user by sound or display that communication cannot be performed (step 6822). . Also, step 6819
In the case of HP overlapping allocation reception, the wireless telephone 103A transmits a call confirmation (step 6820), confirms whether the permission is received (step 6821), and if received, the dial tone transmission (step 6805) is started. Even if the HP has been acquired in step 6802, the dial tone (D
(T) Tell the user from the confidence of the wireless telephone (step 68)
05).

The wireless telephone 103 that heard the dial tone
The user of A inputs information (address) representing the wireless telephone 103B, which is the call destination, from the key matrix 211 (stop dial tone). Waiting for the other party to be designated (step 6806), the wireless telephone 103A uses the LCCH on the HP of the central control station to send the wireless telephone 103A.
A connection request is transmitted to B in sequence S6603 (step 6807). At that time, the HP received from the central control station first
The information of is also notified. The wireless telephone 103B waits for reception at the HP of the centralized control station, and when the connection request is received in the process of FIG. 31 (step 6901), the connection confirmation is made with respect to the other party (caller) that transmitted the request signal. The sequence S
At 6604, the HP of the centralized control station transmits using the LCCH (step 6902). After this, the wireless telephone 103B
Switches the HP to communicate using the HP notified from the wireless telephone 103A.

Upon receiving the connection confirmation (step 6809), the radiotelephone 103A transmits a connection completion signal to the centralized control station by using the LCCH on the HP of the centralized control station in sequence S6605, and the centralized control station Know that a wireless link has been established between extensions. When the wireless link is established between the extensions, the wireless telephone 103A switches the HP to the HP notified from the centralized control station, and transmits a call setting signal to the sequence S6606 wireless telephone 103B.
This signal is also sent with the address of the wireless telephone 103B (step 6811), and a ring back tone (RBT) is heard from the speaker 210 to inform the user that a call is being made (step 6808). Called side wireless telephone 103
When B receives the call setting (step 6903), it makes a sound (ring tone) from the speaker (210) and a display notifying the incoming call on the display unit (212) (step 6910), and responds to the user of the wireless telephone 103B. Encourage. When the user of the wireless telephone 103B searches for a response using the key matrix (211) (step 6911), the wireless telephone 103B sends a response with the address of the wireless telephone 103A in sequence S6607 (step 6904). Wireless phone 1 at this point
03B enters the call state (step 6905), stops the notification of the incoming call, turns on the speaker (210) and the microphone (209), and prepares for the call. The display unit (212) may display the address of the caller's wireless telephone 103A.

On the other hand, when the radio telephone 103A receives the response from the radio telephone 103B in the sequence S6607 (step 6812), the ring back tone is stopped, the speaker (210) and the microphone (209) are turned on, and the telephone is busy. Yes (step 6813). The wireless telephone 103A monitors whether the user performs a call termination operation such as on-hook or receives a release from the wireless telephone 103B (step 6814), and the wireless telephone 103B also has the user on-hook or the like. It is monitored whether or not the operation of ending the call is performed, or whether the disconnection is received from the wireless telephone 103A (step 6906). When the user of the wireless telephone 103A performs a call end operation, the wireless telephone 103A transmits disconnection in sequence S6608 (step 6815), and turns off the microphone (209) and speaker (210). When the wireless telephone 103B receives the disconnection, the microphone (209)
Is turned off, and the speaker (210) stops outputting voice from the other party and outputs a busy tone instead, notifying that the other party hangs up the call (step 6912) and also off-hooks the wireless telephone 103B to the user. Encourage things.

Waiting for the user of the wireless telephone 103B to perform the off-hook operation (step 6913), the wireless telephone 1
03B transmits release (6609) in sequence S6609 (step 6907) and ends the call. Wireless telephone 1
When 03A receives the release (step 6816), it is determined that the call is completely terminated, and then the release request is transmitted in sequence S6610 to disconnect the wireless link (step 6816).
17). The wireless telephone 103B issues a release request in sequence S
When it is received at 6610 (step 6908), the release confirmation is transmitted at sequence S6611 (step 6909), the transmission of the radio wave is stopped, and the wireless link is disconnected. The wireless telephone 103A is
When the release confirmation is received in sequence S6611 (step 6818), is switched to the HP of the centralized control station to disconnect the wireless link and terminate the call.

The extension call sequence of FIG. 32 is as shown in FIG.
8 shows a case of HP duplication allocation in the extension call sequence of No. 8 and in this case, when the duplication allocation is received, the terminal station A confirms the call origination in sequence S7012 before transmitting, and receives the call permission in sequence S7013. From
The external line incoming call is transmitted to the terminal station B in sequence S7003. Other procedures are the same as the extension call sequence of FIG. A direct call between extension lines can be realized by the above procedure.

According to the present embodiment, the central control station receives the HP allocation request from the terminal station 110, and if there is no HP to be allocated at that time, then the HP already allocated to another terminal station is set to the terminal. Duplicate assignment to stations, and
When each terminal station to which these HPs are redundantly allocated makes a call, the central control station is set up in the system by allowing transmission so long as the HPs that are redundantly allocated are not being used by other terminal stations. It is possible to accommodate more terminal stations than the number of existing hopping patterns in the system. Further, even if the number of hopping patterns that can be secured decreases due to deterioration of the radio wave environment or the like, it is possible to secure a sufficient number of usable terminal stations by duplicating HP as described above. Therefore, the usability of the system can be significantly improved. Further, since one hopping pattern is shared by a plurality of terminal stations, the number of times the shared hopping pattern is used increases, so that effective use of radio waves can be achieved.

[0081]

As described above, according to the wireless communication system of the first aspect, the hopping patterns are redundantly assigned to the terminal stations, so that the number of terminals accommodated can be reduced to a necessary number without limiting the number of terminals accommodated by the number of hopping patterns. A terminal can be accommodated, and even if the number of hopping patterns that can be secured decreases due to deterioration of the radio wave environment or the like, it is possible to secure a sufficient number of usable terminal stations.

According to the radio communication system of the second aspect, the hopping pattern that has been assigned redundantly is prevented from being used by a plurality of terminal stations at the same time, so that interference does not occur even if the hopping pattern is assigned redundantly. You can

According to the wireless communication system of the third aspect, since all the hopping patterns are assigned to the terminal station on a one-to-one basis and the hopping patterns are assigned in duplicate, all the hopping patterns are effectively used. The confidentiality can be improved.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of the present wireless communication system.

FIG. 2 is an internal configuration diagram of a wireless telephone.

FIG. 3 is an internal configuration diagram of a wireless adapter.

FIG. 4 is an internal configuration diagram of a network control device.

FIG. 5 is a diagram showing a channel configuration inside a frame used in the present invention.

FIG. 6 is a diagram showing an example of the internal configuration of each channel.

FIG. 7 is a schematic diagram showing an example of hopping and transmission / reception states of a voice channel.

FIG. 8 is a diagram illustrating an example of frequency hopping.

FIG. 9 shows how frequencies are used in each channel.

FIG. 10 is a sequence diagram of HP allocation.

FIG. 11 is a sequence diagram of HP duplicate allocation.

FIG. 12 is a HP allocation flowchart.

FIG. 13 is an HP release flowchart.

FIG. 14 is an HP change flowchart.

FIG. 15 is a HP duplication allocation processing flowchart.

FIG. 16 is a power-on sequence between the centralized control station and the terminal station.

FIG. 17 is an operation flowchart of the centralized control station when the power is turned on.

FIG. 18 is an operation flowchart at the time of newly registering a terminal station in the centralized control station.

FIG. 19 is an operation flowchart when the terminal station is powered on.

FIG. 20 is a sequence when an outside line is transmitted.

FIG. 21 is an operation flowchart of the network control device when an outside line is originated.

FIG. 22 is an operation flowchart of a wireless terminal when an outside line is transmitted.

FIG. 23 is a sequence when an external line arrives in the case of HP duplicate allocation.

FIG. 24 is a sequence when an outside line is received.

FIG. 25 is an operation flowchart of the network control device when an external line is received.

FIG. 26 is a wireless terminal operation flowchart when an outside line is received.

FIG. 27 is an external line incoming sequence (in the case of HP duplicate allocation).

FIG. 28 is an extension communication sequence diagram.

FIG. 29 is an operation flowchart of the centralized control station during extension communication.

FIG. 30 is a flowchart of an extension transmission operation of the terminal station.

FIG. 31 is a flowchart of an extension incoming operation of the terminal station.

FIG. 32 is an extension incoming sequence (in the case of HP duplicate allocation).

[Explanation of symbols]

 101 ... Network control device 102 ... Public line 103 ... Wireless telephone 104-109 ... Wireless data terminal 201, 304, 401 ... Main control unit 202, 305, 402 ... Memory 203 ... Call path unit 204, 404 ... ADPCM codec unit 205, 308, 405 ... Channel codec section 206, 309, 406 ... Wireless control section 207, 303, 407 ... Wireless section 208 ... Handset 209 ... Microphone 210 ... Speaker 211 ... Key matrix 212 ... Display section 301 ... Data terminal 302 ... Wireless adapter 306 ... Communication interface section 307 ... Timer 310 ... Error correction processing section 403 ... Line interface section 408 ... Detection section

Claims (3)

[Claims] 1. A centralized control station that assigns a preset hopping pattern to a plurality of terminal stations accommodated in the system, and a terminal station that performs wireless communication using the hopping pattern assigned by the centralized control station. In the wireless communication system having the above, when a new hopping pattern allocation request is issued from the terminal station, the central control station is provided with an overlapping allocation means for redundantly allocating a hopping pattern already allocated to another station to this terminal station. A wireless communication system characterized by the above. 2. A central control station that assigns a preset hopping pattern to a plurality of terminal stations accommodated in the system, and a terminal station that performs wireless communication using the hopping pattern assigned by the central control station. In the wireless communication system having, when a new hopping pattern allocation request is issued from the terminal station, a duplication allocating means for allocating the hopping pattern already allocated to another station to this terminal station in duplicate, and this duplication allocating means Notification means to notify that the hopping pattern assigned to all terminal stations to which the hopping pattern has been assigned is duplicated, and the terminal station to which the hopping pattern has been assigned are requested to send. And the hopping pattern assigned to this terminal station is used by other terminal stations. Only when it is not used, the central control station is equipped with a call permission means for notifying this terminal station of permission of call origination, and when making a call using a hopping pattern that is assigned in duplicate, The duplication confirmation means for making an inquiry to the centralized control station for permission to make a call, and the duplication permission only when the transmission permission notified by the transmission confirmation means of the centralized control station is received as a result of the inquiry by the transmission permission means. And a call control means for starting a call using the hopping pattern assigned to the terminal station. 3. The central control station is provided with detection means for detecting whether or not all preset hopping patterns have already been assigned to the terminal station on a one-to-one basis, and this detection means detects all the hopping patterns from the terminal. Only when it is detected that it has been assigned to a station, when the duplicate assignment means receives a new hopping pattern assignment request from the terminal station, the duplicate assignment means assigns the hopping pattern already assigned to another station to this terminal station. 3. The wireless communication system according to claim 1, wherein the wireless communication system is assigned redundantly.