JPH09200182A - Radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the radio communication system which contains a required number of terminal equipments by eliminating the limit of number of contained terminal equipments due to number of hopping patterns and by which an available terminal station is sufficiently reserved even when number of hopping patterns to be reserved is reduced due to reasons such as deteriorated radio wave environment, and which cancels allocation of a hopping pattern whose communication frequency is low so as to effectively use a radio wave. SOLUTION: When a radio data terminal station 104 becoming a central control station receives an allocation request of a hopping pattern(HP) from, e.g. a radio telephone set 103 and no HP to be allocated is available, the station 104 cancels an HP with a least communication frequency among HPs having already been allocated to other terminal stations and allocates this cancelled HP to the telephone set 103. The radio telephone set 103 uses the allocated HP and starts the communication.

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. Further, since the hopping pattern is occupied even by the terminal station with low communication frequency, there is a problem that the hopping pattern cannot be used by other terminal stations and effective use of radio waves cannot be achieved.

[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. Further, since the hopping pattern is occupied even by the terminal station with low communication frequency, there is a problem that the hopping pattern cannot be used by other terminal stations and effective use of radio waves cannot be achieved.

Therefore, the present invention has been made to solve the above problems, and can accommodate a required number of terminals without the limitation of the number of terminals accommodated by the number of hopping patterns, and can also deteriorate the radio environment. Even if the number of hopping patterns that can be secured is reduced due to the above reasons, it is possible to secure a sufficient number of usable terminal stations, and to provide a wireless communication system that can effectively use radio waves by eliminating hopping patterns with low communication frequency. The purpose is to do.

[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, a canceling means that cancels the allocation of the hopping pattern that has already been allocated to another station. The centralized control station is provided with an allocating means for allocating the hopping pattern, in which the allocation is canceled by the canceling means, to the terminal station which has made the allocation request.

According to a second aspect of the present invention, 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. Only when it is detected that the hopping pattern has been allocated to the terminal station, the canceling means cancels the hopping pattern already allocated to the other station, and the allocating means makes the allocation request for the canceled hopping pattern. It is characterized by being assigned to a terminal station.

According to a third aspect of the present invention, the central control station is provided with frequency checking means for checking the communication frequency of communication using the hopping pattern to which each wireless terminal station is assigned, and the canceling means has this frequency. It is characterized in that the hopping pattern assigned to the terminal station with the lowest communication frequency examined by the examining means is canceled.

[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.

The wireless telephone 103 and the wireless data terminal 1
The terminal stations 04 to 109 are generically referred to below as the 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. 5 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 is an explanatory diagram showing an example of frequency hopping and a transmission / reception state in a voice channel. In FIG. 9, terminal station A and terminal station B communicate with each other on the first HP shown in FIG. 7, and terminal station C and terminal station D communicate with each other on the second HP. In addition, the terminal station A and the terminal station C transmit on the first voice channel of the two, and the terminal stations B and D transmit on the second voice channel. When the logical control channel is terminated, the terminal station in voice communication sets the frequency to be changed from the current base frame number in the radio unit 207 (or 303) according to the frequency hopping pattern assigned from the system control channel. 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. . In the case of FIG. 9, the terminal stations A and C are transmitting on the first voice channel.

Explaining the case of BF1, after the logical control channel is terminated, the terminal stations A and C change the frequency according to the frequency hopping pattern assigned to each voice communication. As a result of changing the frequency,
Since the first HP is assigned to the terminal station A and the terminal station B, the frequency does not change, but the terminal station C and the terminal station D are not changed.
Changed the frequency to F3. Terminal station A and terminal station C set radio section 207 (or 303) for transmission, and terminal station B and terminal station D set radio section 207 (or 303) for reception. Interact.
At the end of the voice channel, the terminal station A and the terminal station C have the radio unit 20
7 (or 303) is set for reception, and terminal station B and terminal station D set radio section 207 (or 303) for transmission, and 2
Exchange audio data on the second audio 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 that 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 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 managing the communication channels. 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.

The 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 use status of the HP allocated 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. 11), and this information is used to determine from which terminal station the HP will 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. This HP release request is sent from the central control station in sequence S4 as shown by the dotted line.
In step S109, the HP release confirmation is sent to the terminal station in sequence S.
It may be returned at 4110. Besides this case,
The central control station is used when the HP cannot be managed for some reason, and is used to release the HPs of all the terminal stations, reallocate them, and manage the HPs.

FIG. 11 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
(Reassignment process) is performed (step 4204). Unused H
If P exists, temporary registration is performed in the HP table (step 4203) and HP is temporarily allocated to the terminal station (step 4203).
4205). The central control station confirms whether or not the terminal station has succeeded in the connection with the communication partner station by the HP temporarily assigned by the connection completion notification (step 4206) from the terminal station (step 4207), and the connection is successful. If not, provisionally allocated HP
Is registered in the HP table as unused (step 4209), and if the connection is successful, the temporarily allocated HP is registered in the HP table for use (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.

Here, the HP reallocation processing of step 4204 will be described with reference to the flowchart of this processing shown in FIG. When there are no more HP to allocate, first,
Search for the terminal station with the least number of outgoing operations within a certain period of time from now. However, the terminal station that has requested the HP allocation at the time of searching is excluded (step 4601). Next, an HP release request is transmitted to the searched terminal station so as to release the HP assigned to that terminal station (step 4602).
It is confirmed whether or not the HP release confirmation is received from the terminal station (step 4603), and if it is received, the released HP is reassigned to the requesting terminal station (step 4604). This reallocation processing itself is the same as the processing flow after steps 4202 and 4203 of the flowchart shown in FIG.

If the HP release confirmation is not received in step 4603, the terminal station with the next smallest call origination operation is searched, and the HP of that terminal station is released and reallocated, but before entering that processing, all It is confirmed whether or not the terminal station is searched (step 4605). If there is no terminal station that can release the HP if it is searched, the terminal station that has made the HP allocation request cannot be re-allocated. Notify the terminal station that had the error (step 4606). In step 4605,
If all terminal stations have not been searched yet (HP release request has not been issued), the terminal station with the next smallest number of transmissions is searched (step 4607), and HP is sent to that terminal station.
Send a release request.

At step 4603, even if the HP release confirmation is not received, the release confirmation is not transmitted because the terminal station using the HP has some trouble and cannot be used. It may be determined that the HP is present, and the HP may be reallocated. (Assuming that the terminal station to which the HP has been assigned earlier can be used, in that case, it is necessary to include a mechanism that allows recovery).

FIG. 13 shows a flowchart of HP release in the centralized control station. This figure is a procedure for releasing the assigned HP after the communication is completed at the terminal station, and describes the processing performed at the centralized control station side. When the central control station receives the HP release request from the terminal station (step 430)
1) The terminal ID included in the parameter and the HP of the release request are confirmed (step 4302). If the HP of the release request is not the normally assigned HP, an error is notified to the terminal station (step 4304) and the HP is not released. If the HP of the release request can be normally confirmed, unused registration is performed in the HP table (step 4303) and an HP release confirmation is sent to the terminal station (step 4305).

FIG. 14 shows a flow in which the central control station cannot manage the HP because the management information disappears due to the power failure, and the HP is managed again. During normal processing (step 4501), it is monitored whether an HP information management failure has occurred (step 45).
02) If it does not occur, continue the normal processing as it is, and if it is determined that it has occurred, it is determined whether the fault is related to only one terminal station or a plurality of terminal stations (step 4503),
If it is a failure related to a plurality of devices, the process of reallocating HP is started, and first, an HP release request is transmitted to all terminal stations a plurality of times within a certain fixed period. This HP release request is sent by adding not the individual terminal ID but a global terminal ID having a meaning to all terminals in the system. The terminal station that received this request signal is
Is sent to the centralized control station, and the stored HP is released.

The terminal station that has released the HP makes an HP allocation request the next time it tries to make a call. Central control station is H
The P release confirmation is received (step 4505) and it is confirmed that the release is performed. However, assuming that the release confirmation is not received, the subsequent processing is performed and all the HP management tables are initialized ( Step 4506). After that, it waits for an HP allocation request from each terminal station. In the unlikely event that there is a terminal station that cannot receive the HP release request, it will try to communicate without assigning HP. Therefore, the central control station sends a connection completion notification when trying to communicate from the terminal station. When the connection is received, the connection completion confirmation is not transmitted. Instead, the HP is released once, and the allocation request is reissued to start the HP allocation (step 4507).

If it is determined in step 4503 that the fault is related to only one terminal station, then it is used only for the terminal station that is considered to be applicable, or for all terminal stations when the terminal station cannot be specified. An HP confirmation is sent (step 4508). The terminal station that has received this used HP confirmation adds its own terminal ID and transmits the HP information used by itself to the centralized control station. Upon receiving the used HP notification from the terminal station (step 4509), the centralized control station updates and restores the HP table according to the received content (step 451).
0), then the conventional normal processing is started (step 451).
1).

As described above, in the present system, the centralized control station has the HP table unique to the system, and the allocation of the communication channel of the communication between the terminal stations is realized by the centralized control station allocating the HP. The central control station manages all communications in the system. Next, the operation of the centralized control station when changing the HP will be described. This is a function of avoiding a failure by replacing the unavailable frequency with an unused frequency and changing the HP when a certain frequency in the HP becomes unusable due to a failure such as interference in a narrow band. 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 changes the hopping frequency table, and uses the NF (Next Frequency) in the system control channel transmitted for each frame to notify each terminal station of the HP change of the system.

FIG. 15 shows a flowchart of HP change in the centralized control station. The central control station is HP from the terminal station
When the change request is received, the necessity of HP change is confirmed 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). HP if no alternative HP exists
Does not change. If the alternative HP exists, the hopping frequency table is changed, the NF in the system control channel is changed (step 4403), and each terminal station is notified. If the central control station directly changes the HP, substitute H
The presence or absence of P is confirmed (step 4402). If there is no alternative HP, the HP is not changed. If an alternative HP exists, change the hopping frequency table and change the NF in the system control channel (step 4403),
Notify each terminal station. In this way, in this system, the centralized control station manages the HP change according to a request from the terminal station or a request from the centralized control station itself.

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 up 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 DA of the LCCH frame is filled with the global address received by all terminals, and the data section is filled with data indicating that new registration is to be performed and 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 centralized control station by the LCCH frame, the address of the centralized control station is stored, and after this processing is completed, the start-up is completed for the centralized 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 carries out carrier sense on all of the predetermined usable frequencies by using the channel codec section 205 (or 308), 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 judged 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, with regard to the processing at the time of making an outside line from the wireless terminal, a sequence showing the procedure of making an outside line in FIG. 20, an operation flowchart of the network control device 101 at the time of making an outside line, and FIG. This will be described with reference to the operation flowchart of the wireless terminal 110. In FIG. 22, when a call key located on the wireless terminal 110 is pressed or a call operation is performed by a combination of off-hook etc. and a dial (step 5801), it is determined whether HP has already been acquired (step 5802) and it is acquired. If the connection request signal is transmitted (step 5804), if not acquired, the wireless terminal 11
In order to acquire the HP (hopping pattern) required for wireless communication, 0 transmits an HP acquisition request to the centralized control station in sequence S5601 of FIG. 20 (step 580).
3) The wireless communication type (voice / data) is attached to the HP acquisition request as a parameter, 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 executes sequence S5.
At 602, the wireless terminal 110 is notified by HP notification.

As described above, the HP is acquired only when the wireless terminal 110 makes a call for the first time. The wireless terminal 110 receives the HP notification (step 58).
03), storing the HP, and using the HP, the network control device 1
A connection request is sent to 01 (step 5604). On the other hand, when the network control device 101 receives the connection request (step 5701 in FIG. 21), it checks the state of the wireless line, and if it is in the connectable state, it transmits a connection confirmation in sequence S5604 (step 5702). Upon receiving the connection confirmation (step 5806), the wireless terminal 110 recognizes that link establishment of the wireless line is permitted, synchronizes with the voice channel,
In sequence S5606, the outside line is transmitted to the network control device 101.
(Step 5806), the voice communication path is connected, and the call is in progress (step 5807). The dial of the other party is put as a parameter for this outside line transmission, and the dial of the other party is put on the wireless link between the wireless terminal 110 and the network control apparatus 101 in FIG.
Is transmitted on the LCCH of the radio frame shown in FIG. Network control device 101 that received the outside line transmission in sequence S5606
Determines whether it is possible to make an outside line.

If the public network line is free and the call can be transmitted, the network control device 101 captures the public network 102 (step 5704). After the acquisition, if a dial tone from the public network 102 is detected in sequence S5607, the wireless terminal 110 makes an outside line call to sequence S5608, 560.
The dial that came in 9 starts to be transmitted to the public network 102. When all digits have been transmitted (step 5705) and the dial transmission has been completed (step 5706), the communication path with the public network 102 is connected to establish a communication (step 5708). When the public network 102 receives the dial and calls the other party, a ringback tone is transmitted from the public network 102 in sequence S5610, so that the wireless terminal 110 can listen.

When the other party responds, the ringback tone stops and the call is made in sequence S5611. When the call ends and the wireless terminal 110 performs a disconnection operation (for example, on-hook) (step 5808), the on-hook is transmitted in sequence S5612 (step 5810). The on-hook is received by the network control device 101 (step 570).
9), the network control device 101 disconnects the public network 102 (step 5711) and confirms disconnection (5613) to the wireless terminal 110.
(Step 5711). Upon receiving the disconnection confirmation, the wireless terminal 110 opens the communication path (step 5811). The above is the operation of the network control device 101 and the wireless terminal 110 when making an outside line call. For example, the dial is not transmitted all at once as an outside line call, but is divided after the outside line call and is divided. Even if it is sent to 101, it does not affect the present invention.

Next, the operation of the network control device when an external line arrives at the wireless terminal will be described. FIG. 23 is a sequence showing an operation procedure of the network control device 101 receiving an outside line. FIG.
3 is a flowchart showing the operation of the network control device 101 when an outside line is received. First, in sequence S6101, when the network control device 101 receives an incoming call from the public network 102 (step
6201), and proceeds to step 6202 to determine whether HP has already been acquired. If not acquired yet, the network control device 101
Sends to the central control station an HP request to be used for a call in sequence S6102 (step 6203). Upon receiving the request for the HP, the central control station selects an HP that is not currently used from the HP table managed by itself,
The HP is sent to the network controller 101 in sequence S61.
03, and the network control device 101 receives the HP information (step 6204).

Next, the network control device 101 is connected to the wireless terminal 110.
An external line incoming signal is transmitted to A and B in sequence S6104 (step 6205). The wireless terminal 110A goes off-hook, and the network control device 101 sends an off-hook signal in the sequence S.
When it is received in 6105 (step 6206), a connection request signal carrying information such as HP used for outside line communication is E-transmitted in sequence S6106 to the wireless terminal 110A which transmitted the off-hook signal (step 6207). When the network control apparatus 101 receives the connection confirmation signal in sequence S6107 (step 6207), the central control station is notified of the completion of the connection with the wireless terminal 110 in sequence S610.
8 (step 6209), step wireless terminal 1 again
A call display signal is transmitted to 10A in sequence S6109 (step 6210), and the other wireless terminal 110
An external line termination cancellation signal is transmitted to (the wireless terminal 110B in this case) in sequence S6110 (step 621).
1). Then, the wireless terminal 110A is connected to the public network 102 to start a call (step 6212).

Further, the network controller 101 is a wireless terminal 110A.
The connection with the public network 102 is continued until a more on-hook signal is received in sequence S6111 (step 6213).
When an on-hook signal is received in sequence S6111,
A line disconnection signal is transmitted in sequence S6112 to terminate the connection between the public network 102 and the wireless terminal 110A (step
6214). Further, in step 6215, the other wireless terminal 11
The external line in-use display stop signal is sent to 0B in sequence S6113.
To send.

Next, the operation of the wireless terminal when receiving an outside line will be described. FIG. 25 is a flowchart showing the operation of the wireless terminal 110 when an outside line is received. The wireless terminal 110 transmits an external line incoming signal from the network control device 101 in sequence S610.
When it is received at step 4 (step 6301), a ring tone or the like is sounded, and it is detected whether it is off-hook (step 6302).
When the wireless terminal 110A goes off-hook, an off-hook signal is transmitted to the network control apparatus 101 in sequence S6105 (step 6303). If a connection request signal including information such as HP can be received from the network control device 101 in sequence S6106 (step 6304), a connection confirmation signal 6107 is returned in sequence S6107 (step 6305).

If the call display signal from the network control device 101 comes in the sequence S6109 (step 6306), the wireless terminal 110A displays the call on the display unit (# Y04) (step 6306).
6306), and then the call is started (step 6307). Continue talking until you go on-hook (step 6308),
When it is on-hook, an on-hook signal is sent in sequence S6.
At 111, the data is transmitted to the network control device 101 (step 630).
9). If the line disconnection signal comes in sequence S6112,
The line is disconnected, the in-call display on the display unit is turned off, and the call is ended (step 6310).

If the outside line incoming stop signal is sent to the wireless terminal 110B in the sequence S6110 because the other wireless terminal 110A has started a call before the wireless terminal 110 is off hooked (step 6311), the wireless terminal 110B 110B displays an outside line in use on the display unit of the wireless terminal 110 (step 6312). Further, the wireless terminal 110B continues to display the outside line busy display on the display unit until the outside line busy display stop signal comes in sequence S6113 (step 6313), and when the signal comes, erases the outside line busy display (step 6314).

Next, 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
03 to make an extension call, (2 wireless telephones 103
When making an extension call with, the calling side is 103A and the called side is 1
03B). FIG. 26 is a sequence showing a procedure for transmitting and receiving control data of the central control station, the terminal station A (calling side), and the terminal station B (calling side), and FIG. 27 is a flowchart showing an outline process of the central control station. 28 is a flowchart showing the outline processing of the calling terminal station, and FIG. 29 is a flowchart showing the outline processing of the called terminal station. However, in the processing flow, only the relevant processing part is described.

The extension key arranged in the key matrix 211 on the wireless telephone 103A is pressed (step 680).
1) If it is determined that HP has not been acquired yet (step 6802), the wireless telephone 103A determines that the sequence is S6.
At 601, an HP acquisition request signal is sent by the HP of the central control station to L
Transmission is performed using CCH (step 6803). When the central control station determines that the signal has been received (step 6701) and determines that the signal is the HP acquisition request (step 6702), the HP
It is confirmed whether or not the resource exists (step 6705), and if there is, the HP is secured for the request (step 6706) and the HP is notified (step 6707). Wireless phone 103A
If it is determined that the HP notification is received in sequence S6602 (step 6804), it is determined that communication is possible, and the dial tone (DT) is heard from the wireless telephone to the user (step 6805). If the centralized control station (step 6705) determines that there is no resource, the centralized control station performs HP reassignment processing (step 6708, the same processing as in FIG. 12) and HP is still not assigned. In that case, the fact is notified, and the wireless telephone 103A which has received the notification notifies the user of the fact that communication cannot be performed by sound or display (step 6819). However, if HP has already been acquired in step 6802, when a communication operation is performed, a dial tone (DT) is transmitted from the wireless telephone to the user (step 6805). The user of the wireless telephone 103A who heard the dial tone
Information (address) representing the wireless telephone 103B, which is the call destination, is input from the key matrix 211 (stop dial tone). Waiting for the other party to be designated (step 6806), the wireless telephone 103A sets the HP of the central control station.
At step S6803, a connection request is transmitted to the wireless telephone 103B using the LCCH at step S6603. At that time, the HP information received from the central control station is also notified.

The radio telephone 103B is the HP of the central control station.
Waiting to receive, and when a connection request is received (step
6901), to the other party (caller) that sent the request signal,
A connection confirmation is transmitted in sequence S6604 on the HP of the centralized control station using the LCCH (step 6902). After that, 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 wireless telephone 103A sends a connection completion signal to the centralized control station in sequence S6.
At 605, the HP of the centralized control station transmits using the LCCH (step 6810), and the centralized control station knows that a wireless link has been established between the extensions. When the wireless link is established between the extensions, the wireless telephone 103A switches the HP to the HP notified from the centralized control station and sends the call setting signal to the sequence S6.
At 606, the data is transmitted to the 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 wireless telephone 10
Upon receiving the call setting (step 6903), 3B displays a sound (ring tone) from the speaker (210) and an indication of the incoming call on the display unit (212) (step 6904), and responds to the user of the wireless telephone 103B. Encourage. Wireless phone 103B
When the user searches for a response using the key matrix (211) (step 6905), the wireless telephone 103B transmits a response with the address of the wireless telephone 103A attached in sequence S6607 (step 6906). At this point, the wireless telephone 103B enters the call state (step 6907), stops the notification of the incoming call, and then the speaker (210) and the microphone (209).
Turn on and prepare for the call. The display unit (212) may display the address of the caller's wireless telephone 103A.

On the other hand, when the radiotelephone 103A receives the response from the radiotelephone 103B in sequence S6607 (step 6812), the ringback 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 6908). 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, the speaker (210) stops outputting the voice from the other party, outputs a busy tone instead to inform that the other party hangs up the call (step 6901), and also off-hooks the wireless telephone 103B to the user. Encourage things. After waiting for the user of the wireless telephone 103B to perform the off-hook operation (step 6910), the wireless telephone 103B transmits a release in sequence S6609 (step 6911) and ends the call. Upon receiving the release (step 6816), the wireless telephone 103A determines that the call is completely terminated, and then issues a release request to disconnect the wireless link in sequence S661.
0 is transmitted (step 6817). Wireless phone 103B
When the release request is received in sequence S6610 (step 6912), the release confirmation is transmitted in sequence S6611 (step 6913), the transmission of the radio wave is stopped, and the wireless link is disconnected. The wireless telephone 103A confirms the release in sequence S6.
When it is received at 611 (step 6818), is switched to the HP of the centralized control station to disconnect the wireless link and terminate the call.
The central control station checks whether an HP management failure has occurred (step 6703), and if it judges that an HP management failure has occurred, the HP control described above is executed.
The process proceeds to the management failure occurrence process (step 6704). A direct call between extension lines can be realized by the above procedure.

Next, a data communication process between wireless terminals will be described. FIG. 30 is a sequence showing a data communication procedure, and FIG. 31 is a flowchart showing an operation of the wireless terminal 110 at the time of connection in data communication.
32 is a flow chart showing the data transmission operation of the communication terminal, and FIG. 33 is a flow chart showing the data reception operation of the communication terminal. FIG. 34 is a flowchart showing the operation of the wireless terminal 110 at the time of disconnection in data communication. In FIG. 31, the wireless terminal 11
When a transmission operation is performed at the originating terminal station of 0 (step 770
1) It is determined whether HP has been acquired (step 7702). If not acquired, an HP acquisition request is transmitted to the centralized control station in sequence S7601 (step 7703). When the HP notification from the central control station comes in hair 7602 (step 770
4) Sequence S for connection request to the receiving terminal station
7603, and the HP used for communication is notified (step 7705). If it is determined in step 7702 that it has been acquired, the HP already acquired is added and a connection request is transmitted in sequence S7603. When the connection confirmation is received from the receiving terminal station in sequence S7604 (step 770)
6) The connection completion is transmitted to the centralized control station in sequence S7605, and the call connection is terminated (step 7707).

When the call connection is completed, data communication is performed. In this embodiment, data transmission from a transmitting terminal station will be described. When the communication is started, the transmitting terminal station first resets the transmission counter to 0 (step 7801). First, it is checked whether or not there is a retransmission request from the wireless side (step 7802), and if not, then it is checked whether or not there is a data transmission request from the terminal (step 7807). If there is a transmission request, the requested data number is put in the transmission counter (step 7808).
Then, the data of the number in the transmission counter is sequenced S
It is transmitted at 7606 (step 7809). When the resend request comes in sequence S7607, the number of the retransmitted data is designated (step 7803), and the data of the designated number is transmitted (step 7804). If the specified data number is smaller than the transmission counter data (step 7805),
The data of the next number is designated (step 7806) and the designated data is transmitted (step 7804). It is checked whether or not the designated data number is the retransmission request of the transmission counter (step 7802), and if not, it is checked whether or not there is a next data transmission request from the terminal (step 7807). If there is a transmission request, the requested data number is put in the transmission counter (step 7808).

Then, the data of the number in the transmission counter is transmitted in sequence S7606 (step 7809). When the resend request comes in sequence S7607, the number of the retransmitted data is designated (step 7803), and the data of the designated number is transmitted (step 7804). If the specified data number is smaller than the transmission counter data (step 7805), specify the next number data (step 780).
6) Send the specified data (step 7804).
When the designated data number matches the transmission counter number (step 7806), the normal transmission state is restored. When a disconnection request is received from the terminal (step 7810), the transmission ends.
When the communication is started, the receiving terminal station first resets the reception counter to 0 (step 7901). When the data is received (step 7902), it is checked whether the data is corrupted (step 7903). If the data is not damaged, the data number is checked next (step 7904), and it is checked whether the data number is the number next to the reception counter number (step 7905). If the data is received in the correct order,
The data is sent to the terminal (step 7907), and the data number is entered in the reception counter (step 7908). If data cannot be received in order due to data corruption or missing data, a resend request is transmitted in sequence S7607 (step 7906). When a disconnection request is received from the wireless side (step 7909), the reception ends. The calling terminal station enters the disconnection phase when a disconnection request is received from the terminal (step 800).
1), sequence S760 to notify the called terminal station of disconnection
8 (step 8002), and when disconnection confirmation is received in sequence S7609 (step 8003), the disconnection ends.

[0075]

As described above, according to the wireless communication system of the present invention, the required number of terminals can be accommodated without limiting the number of terminals accommodated by the number of hopping patterns, and the radio wave environment is deteriorated. Even if the number of hopping patterns that can be secured decreases, it is possible to secure a sufficient number of usable terminal stations, and it is possible to effectively use radio waves by eliminating hopping patterns with low communication frequency.

[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 an example of the internal configuration of each channel.

FIG. 7 is an example of frequency hopping.

FIG. 8 shows how the frequency is used in each channel.

FIG. 9 is a schematic diagram showing an example of hopping and transmission / reception states of a voice channel.

FIG. 10 is an HP allocation sequence diagram.

FIG. 11 is a HP allocation flowchart.

FIG. 12 is a HP reassignment flowchart.

FIG. 13 is an HP release flowchart.

FIG. 14 is an HP re-management flow chart.

FIG. 15 is an HP change 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 an external line incoming sequence.

FIG. 24 is an operation flowchart of the network control device when an external line is received.

FIG. 25 is a wireless terminal operation flowchart when an outside line is received.

FIG. 26 is an extension communication sequence diagram.

FIG. 27 is an operation flowchart of the centralized control station at the time of extension communication.

FIG. 28 is a flowchart of an extension transmission operation of the terminal station.

FIG. 29 is a flowchart of an extension incoming operation of the terminal station.

FIG. 30 is a communication sequence between data terminals.

FIG. 31 is a connection communication flowchart between data terminals.

FIG. 32 is a data transmission flowchart.

FIG. 33 is a data reception flowchart.

FIG. 34 is a disconnection communication flowchart between data terminals.

[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 there is a new hopping pattern allocation request from the terminal station, a cancellation means for canceling the allocation of the hopping pattern already allocated to another station, and a hopping method for canceling the allocation by the cancellation means. A wireless communication system, comprising: an allocation unit that allocates a pattern to the terminal station that has made the allocation request, in the central control station. 2. The centralized 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, and the detecting means detects all the hopping patterns from the terminal. Only when it is detected that the hopping pattern has been allocated to another station, the canceling means cancels the hopping pattern already allocated to another station, and the allocating means allocates the canceled hopping pattern to the terminal station that made the allocation request. The wireless communication system according to claim 1, wherein 3. The central control station is provided with a frequency checking means for checking a communication frequency of communication using a hopping pattern to which each wireless terminal station is assigned, and the canceling means checks the frequency checking means. The wireless communication system according to claim 1 or 2, wherein the allocation of the hopping pattern allocated to the terminal station having the least communication frequency is canceled.