JPH08340577A - Wireless terminal position detection method - Google Patents

Abstract

(57) [Abstract] [Purpose] When the wireless terminal device cannot be wirelessly communicated with the main device regardless of whether the wireless terminal device is in a call or not, It is an object of the present invention to provide a wireless terminal position detecting method capable of detecting this and notifying the user of the wireless terminal device of this. [Configuration] When a wireless terminal device is activated, a function of transmitting information such as an identification number registered in the wireless terminal device to the main device, and a main device receiving this identification number A function that sends back information such as the system number registered in the device, and a system number that is regularly transmitted from the main device even after the wireless terminal device is activated, regardless of whether the wireless terminal device is in a call. And a function for receiving the etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless switching system having a function of connecting to a public line and a switching function, and more particularly, wireless terminal position detection for detecting a positional relationship between a wireless terminal device and a main device constituting the wireless switching system. It is related to the method.

[0002]

2. Description of the Related Art With the recent development of wireless communication technology, wireless communication has been applied in various fields. A telephone exchange device (including a key telephone device) is no exception, and a system for performing wireless communication between a main device having an exchange function and a dedicated telephone has been proposed.

[0003]

By the way, in such a wireless exchange system, there is a case where communication is impossible due to the positional relationship between the main device and the wireless terminal device due to the restriction of wireless communication.

Then, when the wireless terminal device is in a call, when the wireless terminal device moves to a position where communication is impossible,
The user can recognize this by the voice of the other party being intermittent, but when the call is not in progress, the wireless terminal device
It becomes impossible to receive the incoming signal from the main unit,
Further, it becomes impossible to make a call from the wireless terminal device.

Therefore, the user of the wireless terminal device is required to know the position where it can communicate with the main device by himself / herself.

According to the present invention, regardless of whether or not the wireless terminal device is in a call, when the wireless communication between the installation position of the wireless terminal device and the main device becomes impossible, It is an object of the present invention to provide a wireless terminal position detection method capable of detecting and notifying the user of the wireless terminal device.

[0007]

According to the first invention of the present application, each wireless terminal device transmits information such as an identification number registered in the wireless terminal device to the main device when the wireless terminal device is activated. The main device having received the identification number has means for returning the information such as the system number registered in the main device to the wireless terminal device.

Further, in the second invention of the present application, the wireless terminal device receives the system number or the like periodically transmitted from the main device regardless of whether or not the wireless terminal device is in a call even after being activated. And means for doing so.

[0009]

With the above configuration, the wireless terminal device can be activated at the time of its activation (first invention) or periodically after activation (second invention).
It is possible to detect the positional relationship with the main device and notify the user of the wireless terminal device of this.

[0010]

EXAMPLE A first example of the present invention will be described below. In the first embodiment, a case where digital radio communication by the frequency hopping method is introduced into the exchange system will be described.

(System Configuration) FIG. 1 is a block diagram showing a system configuration assumed in this embodiment.

This system accommodates a public line 102 and has a switching function and a wireless connection function.
And a plurality of wireless terminal devices (wireless telephones 103-A and 103-B) for communicating control data and voice data with the exchange 101.

(Configuration of Main Unit) Next, the configuration of the main unit for accommodating the public line will be described.

FIG. 2 is a block diagram showing the system configuration and the configuration of the main unit in this embodiment.

The main unit 1 accommodates a plurality of outside lines and a plurality of terminals and exchanges calls between them, and corresponds to the exchange 101. The connection device 2 receives the control of the main device 1 and wirelessly controls the wireless terminal to establish a wireless transmission path so that the wireless terminal device can be accommodated in the system.

The wireless telephone 3 communicates with the outside line accommodated in the main device 1 via the connection device 2 and
Make extension calls to each other.

The PSTN (existing public network) 6 is one of the external networks accommodated in the main unit 1, and the PSTN line 7
Is an outside line from PSTN6. The SLT (single telephone) 8 is one of the terminals housed in the main device 1.

Next, the internal structure of the main unit 1 will be described.

The CPU 201 is the center of the main unit 1,
It controls the entire main device including the exchange control. R
The OM 202 stores a control program of the CPU 201, and the RAM 203 stores various data for controlling the CPU 201 and provides a work area for various calculations.

The call path unit 204 controls call exchange (time division exchange) under the control of the CPU 201.
The N line i / f 205 is a PS under the control of the CPU 201.
This is to perform PSTN line control such as incoming call detection for accommodating a TN line, transmission of a selection signal, and DC loop closure.

Under the control of the CPU 201, the SLTi / f 206 performs power supply for allowing the SLT 8 to be accommodated, loop detection, selection signal reception, call signal transmission, and the like.

The telephone section 207 has a handset, a dial key, a call circuit, a display, etc., and the CPU 201 when energized.
Under the control of the above, it functions as a telephone for exclusive use of extension wireless, and only speaks as an SLT at the time of power failure.

The tone sending circuit 208 sends out various tones such as a PB signal, a dial tone and a ring tone.

Under the control of the CPU 201, the connection device i / f 209 transmits / receives a call signal and a control signal to / from the connection device 2 for accommodating the connection device 2.

(Structure of Connection Device) FIG. 3 is a block diagram showing the structure of the connection device 2.

The CPU 301 is the center of the connection device 2 and controls the entire connection device 2 including the control of the communication channel and the radio section.

The ROM 302 stores the control program of the CPU 301, and the EEPROM 303.
Stores the calling code (system ID) of the exchange system. Further, the RAM 304 is the CPU 3
01 stores various data for control and provides a work area for various calculations.

The main unit i / f 305 transmits / receives a call signal and a control signal to / from the connection unit i / f of the main unit 1 under the control of the CPU 301.

The PCM / ADPCM conversion unit 306 uses the CP
Under the control of U301, the PCM-coded speech signal from the main device 1 is converted into an ADPCM code and transmitted to the channel codec 307, and at the same time, the channel codec 3
The ADPCM coded call signal from 07 is converted into a PCM code and transmitted to the main unit 1.

The channel codec 307 is the CPU 30.
Under the control of 1, the ADPCM-encoded speech signal and control signal are subjected to scrambling and the like, and time-division multiplexed into a predetermined frame.

Under the control of the CPU 301, the radio section 308 modulates the framed digital signal from the channel codec 307, processes it so that it can be transmitted by radio, transmits it to the antenna, and receives it from the antenna by radio. The signal is demodulated and processed into a framed digital signal.

(Construction of Radio Dedicated Telephone) FIG. 4 is a block diagram showing the construction of the radio dedicated telephone 3.

The CPU 401 is the center of the wireless-only telephone 3, and includes the wireless-only telephone 3 including control of the wireless section and call control.
It controls the whole system.

The ROM 402 stores the control program of the CPU 401, and the EEPROM 403.
Is a call code (system ID) of the exchange system,
It stores the identification number (sub ID) of the wireless telephone. The RAM 404 stores various data for controlling the CPU 401 and provides a work area for various calculations.

Under the control of the CPU 401, the call circuit 405 inputs / outputs a call signal from a handset 409, a microphone 410, and a speaker 411 described later.

The ADPCM codec 406 is the CPU 4
Under the control of 01, the analog voice signal from the call circuit 405 is converted into an ADPCM code and transmitted to a channel codec 407 described later, and at the same time, the channel codec 40
The ADPCM coded call signal from 7 is converted into an analog voice signal and transmitted to the call circuit.

The channel codec 407 is a CPU 40.
Under the control of 1, the ADPCM-encoded speech signal and control signal are subjected to scrambling and the like, and time-division multiplexed into a predetermined frame.

Under the control of the CPU 401, the radio section 408 modulates the framed digital signal from the channel codec 407, processes it so that it can be transmitted by radio, transmits it to the antenna, and receives it from the antenna by radio. The signal is demodulated and processed into a framed digital signal.

The handset 409 is for inputting / outputting a voice signal for talking, and the microphone 410 is for collecting and inputting a voice signal. In addition, the speaker 411 is
The audio signal is output in a loud voice.

The key matrix 412 is composed of dial keys for inputting dial numbers and the like, function keys such as an outside line key, a hold key, and a speaker.

The display unit 413 displays the dial number input from the key matrix 412, the usage status of the outside line, the positional relationship with the main unit 1, and the like.

(Wireless frame) FIGS. 5 (1) to 5 (6)
It is explanatory drawing which shows the structure of the wireless frame used in this system. In this system, "main device-wireless dedicated telephone communication frame" (hereinafter referred to as "PCF") for communication between the main device and wireless dedicated telephone and "wireless for wireless communication between wireless dedicated telephones" Two different frames of "dedicated telephone communication frame" (hereinafter referred to as PPF) are used. The details of the internal data of each frame will be described below.

FIG. 5A shows the PCF. In the figure, FSYN is a synchronization signal, LCCH-T is a logical control channel sent from the main unit to the wireless telephone, LC
CH-R is a logical control channel sent from the wireless dedicated telephone to the main device, T1 to T4 are voice channels sent to four different wireless dedicated telephones, and R1 to R4 are voices sent from four different wireless dedicated telephones. Channel and GT represent guard time.

Further, in FIG. 5 (1), F1, F
3 indicates a frequency channel used when wirelessly transmitting this frame, and indicates that the frequency channel is changed every time one frame is transmitted.

FIG. 5B shows the PPF. In the figure, FSYN is a synchronization signal, LCCH-T is a logical control channel sent from the main unit to the wireless telephone, LC
CH-R is a logical control channel sent from the wireless dedicated telephone to the main device, T1 to T3 are voice channels sent to three different wireless dedicated telephones, and R1 to R3 are voices sent from three different wireless dedicated telephones. Channel, GT represents guard time, and RV represents reserved bit.

Further, in FIG. 5 (2), F1, F
3, F5, and F7 are frequency channels used when wirelessly transmitting this frame, and unlike PCF, after receiving the logical control information LCCH-T from the main device in F1, the frequency channel is changed. Switch to F5, which is secured for communication between wireless-only telephones, and perform communication between wireless-only telephones. After that, the procedure of switching the frequency channel to F3, receiving the logical control information from the main device, and switching the frequency channel to F7 secured for the communication between wireless dedicated phones is repeated until the communication between the wireless dedicated phones is completed.

FIG. 5C shows an FSYN frame. In the figure, PR is a 62-bit preamble for frequency synchronization acquisition specified by the Radio Wave System Development Center (hereinafter referred to as RCR), and SYN is RC.
31-bit frame sync signal defined by R, ID is R
A 63-bit calling signal defined by CR, FI is a 2-bit channel type signal that distinguishes between PCF and PPF, TS is time slot information, and NFR is frequency information of the next frame. The numbers in the figure indicate the number of bits in this embodiment.

FIG. 5 (4) shows a frame of the voice channel. Since the configurations of T1 to T4 and R1 to R4 are common, the transmission voice channels are collectively referred to as Tn, and the reception voice channels are collectively referred to as Rn. The configurations of Tn and Rn are also common.

In FIG. 5 (4), R is the time of carrier sense for confirming that the previous frame has ended, and for confirming whether another wireless device is emitting radio waves, PR1 is each Slot preamble, UW
Is a unique word including sub ID, D is 3.2 kbps
D channel information, B represents 32 kbps B channel information, and GT represents guard time. The numbers in the figure are
The number of bits in this embodiment is shown.

FIG. 5 (5) shows a logical control channel LCCH.
3 shows a frame structure of -T. LCCH-T is a logical control channel sent from the main unit to the wireless telephone. In the figure, UW represents a unique word including a sub ID, LCCH represents logical control information, and GT represents a guard time. Since LCCH-T is sent continuously after sending FSYN, no preamble or the like is added.

FIG. 5 (6) shows the logical control channel LCCH.
3 shows a frame structure of -R. LCCH-R is a logical control channel sent from the wireless-only telephone to the main unit. In the figure, R is the time of carrier sense for confirming that the previous frame has ended, and for confirming whether another wireless device is emitting a radio wave,
PR1 is a preamble for each slot, UW is a unique word including a sub ID, LCCH is logical control information, and GT is a guard time.

(Frequency Hopping Pattern) FIG. 6 is an explanatory view showing the concept of frequency hopping used in this system. In the system of the present embodiment, 1 MHz is used by using the 26 MHz band which is approved for use in Japan.
26 z-width frequency channels are used. Consider the case where there is a frequency that cannot be used due to interference such as noise.
20 frequency channels are selected from among these channels, and the selected frequency channels are moved in a predetermined order to perform frequency hopping.

In this system, one frame has a length of 5 ms, and the frequency channel is hopped for each frame. Therefore, the length of one cycle of one hopping pattern is 100 ms.

In the figure, different hopping patterns are shown as different patterns. In this way, PCF, PP
By setting the hopping pattern so that each frame of F does not use the same frequency at the same time, it is possible to prevent occurrence of data error due to mutual interference.

Further, in the system described in this embodiment,
When accommodating a plurality of connecting devices, different hopping patterns are used for each connecting device in order to prevent interference between the connecting devices. With this method, a system having a multi-cell configuration can be realized and a wide service area can be obtained.

(Detailed Operation Description) The specific operation of the present system will be described below in some cases.

(1) Basic operation procedure In this system, before using the communication channel,
The feature is that the slot to be used and the hopping pattern are determined by using the logical control channels (LCCH-T and LCCH-R) which are time-division multiplexed within the frame. Further, in order for each wireless-only telephone to perform intermittent reception and to save power of the power source, each wireless-only telephone is designed to transmit and receive at a pre-allocated frequency and only on a logical control channel for transmission. ing.

However, immediately after the power is turned on, each wireless telephone does not recognize the hopping pattern. Therefore, the wireless-only telephone stands by at an arbitrary frequency and receives a frame at that frequency. Then, when the first frame is received, the transmission frequency information of the next frame is read from the frame, and this is repeated thereafter to start frequency hopping.

Immediately after the power is turned on, which frequency is assigned to which radio telephone is not determined. Therefore, when the power is turned on, the identification number (sub ID) of each terminal is registered and the logical control channel frequency is assigned in the setting mode.

When the logical control channel is assigned, each wireless dedicated telephone enters the intermittent reception state, and receives only the logical control data addressed to itself. Also, normally, the sub-ID of the own device is always used by using the LCCH-R of the assigned frequency
Is sent to the main device, and when data to be sent from the wireless-only telephone is generated, the data is sent to the main device using LCCH-R.

When it is desired to start communication using the call slot, the logical control channel must be used to notify the main device of that fact and the slot and hopping pattern must be assigned. After making those assignments,
It becomes possible to make a call and transmit data.

The detailed operation of some examples will be described below.

(2) Operation when main unit and wireless dedicated telephone are turned on (setting mode) In this mode, the sub ID of the dedicated wireless telephone is registered and the frequency of the logical control channel to be used is set.

FIG. 7 is a sequence chart showing the operations of the main unit and the wireless telephone according to this embodiment when the power is turned on. Further, FIG. 8 is a flowchart showing an operation at the time of turning on the power of the main device according to the present embodiment.
FIG. 6 is a flow chart showing an operation when the power of the wireless telephone according to the present embodiment is turned on.

(2-1) Description of Operation When Powering On Main Unit Power First, when the power switch of the main unit 1 main body is turned on, the main unit 1 initializes the main body by S801 of FIG. 8 and then at S802. , Determines a hopping pattern for frequency hopping used in wireless communication, and then transmits a PCF frame to which the hopping pattern (frequency hopping in the next unit time) and the system ID of the present system are added in S803. At this time, the system ID is stored in the ID section ((3) of FIG. 5) in the PCF frame,
The FR section (FIG. 5 (3)) contains information on the frequency hopping in the next unit time in the hopping pattern, and the LCCH section (FIG. 5 (5)) contains the control information of the wireless dedicated telephone. It contains information about free control channels available for communication.

Next, the main device 1 is connected to the wireless telephone 103.
To system ID and sub ID of the wireless telephone
If the information for location registration is received (S804), the sub ID of the wireless dedicated telephone 103 is sent in S805.
Is stored in the RAM 203 in the device, and the wireless dedicated telephone 10
3 determines the control channel for transmitting the wireless communication control information addressed to the wireless communication terminal 3 and transmits the wireless communication control information to the wireless dedicated telephone 103 in S806.
(703 in FIG. 7).

(2-2) Description of Operation when Powering on the Wireless Telephone Only First, when the power switch of the wireless telephone 103 main body is turned on, a setting mode is set, and the wireless telephone 103 initializes the main body by S901 in FIG. To do. Then S
At 902, the sub ID of the wireless dedicated telephone 103 is manually input, and the wireless dedicated telephone 103 inputs the sub ID.
It is stored in the EPROM 403.

Next, in S903, the PC from the main unit 1
In order to receive the F frame, the reception standby state is set at an arbitrary frequency. If the PCF frame from the main device 1 can be received in S904, the system ID is recognized and stored from the ID section (FIG. 5 (3)) in the PCF frame and the LCCH section (FIG. 5)) acquires free channel information (frequency at which PCF frame is transmitted from the wireless-only telephone to the main device).

Further, the frequency for hopping in the next unit time is acquired from the NFR part in the PCF frame, the radio dedicated telephone 103 moves the reception frequency to that frequency, and waits for the next PCF frame. The wireless telephone 103 repeats this operation, recognizes the frequency hopping pattern, and stores it (S906).

When the hopping pattern and the system ID are found, the radio-only telephone 103 determines the LCCH.
A frame (702 in FIG. 7) to which the system ID and the sub ID information of the own device are added is transmitted to the main device 1 on the idle control channel obtained by the unit (S90).
7).

After that, when the control frequency channel designation information is received from the main unit 1, intermittent reception is started on the designated control channel (S908), and the setting mode is shifted to the normal mode.

(3) Operation of main device and wireless-only telephone in normal mode (3-1) When no call is made As described above, wireless-only telephone 103 is assigned in advance by the main device 1 in the normal mode. It waits on the frequency channel for control, and receives the LCCH-T from the main device 1 that is periodically sent. At this time, the LCCH sent from the main unit 1 includes information such as whether or not there is an outside line incoming call and whether or not there is a call request at the wireless telephone side.

The wireless-only telephone 103 sends the LCCH extracted by the received frame processing unit to the CPU 401, and then transmits the LCH to the main unit instructed by the CPU 401.
The CCH is transmitted to the main device on the LCCH-R in the same frame. Even if there is no request for calling, etc., the wireless telephone 103 always receives the LCCH-T transmitted from the main device 1 every 100 ms and returns the sub-ID of the own device by LCCH-R. To do. Wireless-only phone 1
03 repeats the above procedure until an outgoing call or an incoming call occurs.

The basic operation when no call is made is as described above, but the installation position of the wireless telephone 103 moves and goes out of the service area, and the LCCH from the main unit 1
Even if a certain time of 100 ms or more elapses, the L
When the CCH cannot be received, the CPU 401
It is determined that the electric field strength sufficient for communication between the main unit and the wireless-only telephone cannot be obtained, and the fact is displayed on the display unit 413 of the wireless-only telephone to notify the user of the wireless-only telephone.

In this case, the user of the wireless telephone 103 is required to make communication with the main unit 1 again.
While checking the display unit 413, the position of the wireless telephone is moved to search for a communicable position.

Since the main apparatus continues to transmit LCCH-T every 100 ms even if the response from the wireless-only telephone is lost, the wireless-only telephone moves again to a position where it can receive the LCCH-T. Control information can be exchanged with the main device.

(3-2) At the time of call Here, a case where the wireless telephone A (103-A) makes a call will be described as an example.

It is assumed that the wireless telephone A (103-A) is exchanging the LCCH with the main unit on the frequency channel F1 during non-communication. Wireless dedicated telephone A (103
-A) intercepts the LCCH from the main unit on the frequency channel F1 by the procedure described in (3-1) until a call is made.

When a call is originated at the wireless telephone A (103-A), a call request is sent to the main device by sending a call request to the LCCH-R to be sent to the main device in the procedure of 3.1. The LCCH that informs whether communication is possible from the main unit side is determined by the LCCH sent on the frequency channel F1 after 100 ms.

LC sent from the main unit after calling request
If the content of the CH is analyzed and it indicates that all lines are in use and cannot be connected, the wireless telephone A (103-A) informs the user that this is busy.

The LCCH from the main unit after the call request is issued
If the content of indicates that the connection is possible, the same LC
In CH-T, a time slot of a voice channel used in a call is designated. For example, if "1" is designated, it indicates that communication is performed using T1 and R1.

After this, the TS and N in the FSYN frame
Using the frequency hopping pattern specified by FR,
Communication is performed while switching frequency channels.

The exchange of control information after connecting to the main unit is performed by the D channel information in the Tn and Rn frames.

In the case of communication between wireless dedicated telephones, D channel information is used as control information between wireless dedicated telephones. After the communication is completed, in the case of the above-mentioned example, LCCH-R of the frequency channel in which each wireless dedicated telephone is designated,
When the wireless-only telephone A (103-A) exchanges control information with the main device again in the frequency channel F1 when there is no communication, the wireless-only telephone indicates that the communication between the wireless-only telephones has ended. Notify the device.

As described above, during a call, the control information with the main unit is exchanged together with the voice every time the frequency hopping is performed, so that the installation position of the wireless telephone 103 is moved and a sufficient electric field is generated. When the strength cannot be obtained, the fact is displayed on the display unit 413 of the wireless telephone as in the case of no call.

In the above description of the first embodiment, whether or not the wireless call is possible is displayed depending on whether or not the control information transmitted from the main unit can be correctly analyzed in the wireless telephone. In addition, the electric field strength received by the wireless-only telephone may be measured at the high frequency input stage of the wireless unit 308 and displayed in several stages (three stages of excellent, good, acceptable) and displayed.

Further, as in the case of having a plurality of main devices, or in the case of having a single main device and a plurality of connecting devices operating, the entire wireless switching system is divided into several zones. In this case, not only the communication status but also which main device (connection device) from which the LCCH is received can be displayed.

[0088]

As described above, according to the present invention,
By transmitting the identification number and the system number between the main device and the wireless terminal device at the time of starting the wireless terminal device and periodically after the wireless terminal device is activated regardless of whether or not a call is being made, the wireless terminal device As a result of moving the installation position of
When communication between the main device and the wireless terminal device becomes impossible, the wireless terminal device detects this and notifies the user of the wireless terminal device that the wireless terminal device is in a position where it can be used in the wireless switching system. There is an effect that it can be confirmed whether or not there is.

[Brief description of drawings]

FIG. 1 is a block diagram showing a system configuration assumed in an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a system and a main device in the above embodiment.

FIG. 3 is a block diagram showing a configuration of a connection device in the above embodiment.

FIG. 4 is a block diagram showing a configuration of a wireless telephone in the above-described embodiment.

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

FIG. 6 is an explanatory diagram showing the concept of frequency hopping used in the above embodiment.

FIG. 7 is a sequence chart showing an operation at the time of turning on the power of the main device and the wireless telephone of the above-described embodiment.

FIG. 8 is a flowchart showing an operation of the main device of the above embodiment when the power is turned on.

FIG. 9 is a flowchart showing an operation at the time of turning on the power of the wireless telephone of the above-described embodiment.

[Explanation of symbols]

 101 ... Switch, 102 ... Public line, 103-A, 103-B ... Wireless dedicated telephone.

Claims (6)

[Claims] 1. A wireless switching system comprising a main device accommodating a public line and a plurality of wireless terminal devices performing wireless communication with the main device, wherein each wireless terminal device At the time of start-up, the main device has means for transmitting start-up information to the main device, and the main device returns to the means for receiving the start-up information and the wireless terminal device that has transmitted the start-up information, and relates to the main device. And a means for transmitting information, and the wireless terminal device has means for receiving information about the main device. 2. The wireless communication device according to claim 1, wherein the main device has means for periodically transmitting information about the main device to the wireless terminal device after receiving the activation information. Even after the activation, the main device periodically transmitted from the main device regardless of whether or not a call is being made with another wireless terminal device in the wireless switching system and a terminal device connected to the public line. A wireless terminal position detecting method, characterized in that it has means for receiving information about the wireless terminal. 3. The wireless terminal position detection method according to claim 1, wherein the wireless terminal device has a unit that processes information about the main device and notifies the user of the wireless terminal device of the information. . 4. The wireless terminal position detecting method according to claim 1, wherein the activation information includes a wireless terminal device identification number registered in advance in the wireless terminal device. 5. The wireless terminal position detection method according to claim 1, wherein the information about the main device includes a system number registered in the main device. 6. The wireless terminal position detection method according to claim 1, wherein the wireless communication method is spread spectrum communication using a frequency hopping method.