JPH06164481A - Radio communication system - Google Patents

Abstract

PURPOSE:To make an effective use of a radio channel and a base station equipment and to shorten incoming delay time by notifying the call state of a communication line from the base station side to a mobile station and displaying the received call state of the communication line to be notified in the mobile station. CONSTITUTION:A switchboard notifies the line state to the base station side, for example only when it is changed. When the switchboard receives an incoming signal of 16Hz from a PSTN, the line state is changed so that a LINECH2 is sent to the base station. The base station sends the line state of the LINECH1 from a call state notification section 101 with the use of a common control channel until it accepts the LINECH2. The base station accepts the LINECH2 from the exchange and stores its line state, and then the line state is notified to the mobile station via a common control channel. In the mobile station, when the LINECH2 from the base station is received by the call state reception section 102 during receiving the common control channel, the display of the line state is performed by a call state display section 103.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system for communicating between a base station and a mobile station using a plurality of communication lines.

[0002]

2. Description of the Related Art A wireless communication system for performing communication between a base station and a mobile station using a plurality of communication lines, for example, a cordless button telephone system or a cordless premises in which a function of a button telephone used in an office is converted to a cordless telephone. When a group call is made in which a plurality of mobile stations wait for an incoming call on one communication line in an exchange, there is a method of making an individual incoming call to the mobile station.

FIG. 21 is a diagram showing the configuration of a conventional wireless communication system for making such a group call.
This wireless communication system includes communication lines 200-1, 200-
2, mobile stations 203a to 203c, base stations 202a, 20
2b and an exchange 201 that controls these and circuit switching
Consists of. A plurality of mobile stations correspond to one communication line, and when there is an incoming call to that line, the exchange 203 needs to make an incoming call to all the corresponding mobile stations. In this system, the calling method is the same as the conventional wireless telephone,
Since the incoming call method is special, the method of controlling the incoming call to the mobile station will be described below.

In the system of FIG. 21, line 200-1 corresponds to mobile stations 203a and 203c, and line 200-
2 and mobile stations 203a, 203b, 203c are assumed to correspond. When an incoming call is received on the line 200-1, the exchange 201 causes the mobile stations 203a, 2b corresponding to the line 200-1 to operate.
Control to establish a wireless line to 03c. Specifically, for example, first, an incoming call is made to the mobile station 203a to connect to the wireless section, then an incoming call is made to the mobile station 203c to connect to the wireless section, and the wireless connection with all the mobile stations is completed. There is a method of starting ringing of the mobile stations 203a and 203c at that time.

Here, in order to make a call, for example, the mobile station 2
When the incoming call is answered at 03c, the exchange 201 determines that the line 200
-1 is connected to the mobile station 203c, and control is performed to stop ringing of the incoming call of the mobile station 203a. As described above, a plurality of mobile stations are called, a mobile station with which a call is made is selected, and a one-to-one telephone connection can be established.

[0006]

The first problem of the above-mentioned conventional radio communication system is that radio channels and base station equipments are required for the number of mobile stations to be called by one line. For example, in a system in which 100 mobile stations wait for an incoming call on one line, in the worst case, it is necessary to assume that all mobile stations move into the same radio zone. One base station requires 100 wireless channels and base station equipment. As a result, there is a problem that a huge amount of equipment is required to carry the peak traffic even if the normal traffic is low. In addition, 100 wireless channels are used each time there is an incoming call on one line, which is against the effective use of frequencies.

Further, as a second problem, when a large number of mobile stations corresponding to one line, up to 100, actually gather in the wireless zone, it is necessary to call these mobile stations in order, so that there is a delay in receiving a call. It takes time, and the so-called incoming call delay time becomes long.

The present invention has been made in order to solve such a conventional problem, and provides a wireless communication system capable of effectively utilizing a wireless channel and base station equipment and shortening an incoming call delay time. The purpose is to

[0009]

According to the present invention, the above object is achieved by the following constitutions.

(1) Call status notifying means (first call status notification) for notifying the base station side of the call status of the communication line used in the system to the mobile station through a common wireless channel in the system. Means for receiving the call status of the communication line notified to the mobile station by the call status notification means, and a call status display means for displaying the call status received by the call status reception means. Prepare

(2) In addition to the basic configuration of the above (1), the base station side recognizes a mobile station that cannot receive the common wireless channel, and this recognition means cannot receive the common wireless channel. And a second call state notifying means for notifying the mobile station recognized as the call state of the communication line through an individual radio channel, and the call state receiving means of the mobile station includes the first and second call state receiving means. The call status of the communication line notified by the call status notification means is received.

(3) In addition to the basic configuration of (1) above, whether or not to prohibit transmission using the communication line according to the call state of the communication line displayed on the mobile station by the call state display means,
Alternatively, it is provided with transmission control means for selecting a communication line for transmission according to the call state.

(4) In addition to the basic configuration of the above (1), the communication lines used in the system on the base station side are divided into groups of line patterns including a plurality of lines, and signals are transmitted to each base station. A line pattern limiting means for limiting the line pattern and a line pattern identifying means for adding identification information of the line pattern limited by the line pattern limiting means to a signal to be transmitted by a radio channel.

(5) In addition to the basic configuration of (1) above, a line for determining whether or not the line pattern of which the mobile station notifies the call state from the base station and the line pattern required by the mobile station are matched. The base station includes the pattern determining means and the first line pattern notifying means for notifying the base station of the line pattern required by the mobile station when the line pattern determining means determines that there is a mismatch. A registration / cancellation means for performing registration and deregistration of a mobile station corresponding to the mobile station in response to movement of the mobile station, and notifying a line pattern required by the mobile station registered by the registration / cancellation means. 2 line pattern notifying means.

[0015]

(1) In the present invention, the call status of the communication line used in the system is notified from the base station side to the mobile station through a common wireless channel in the system, and the mobile station is notified. By configuring to receive and display the call status of the communication line, for example, when an incoming call is received on the line, it is possible to notify the incoming call to the mobile station through a common wireless channel without establishing a wireless channel for each mobile station. It is possible to make a notification, and the mobile station recognizes that it is an incoming call to the own station based on the notification, and can display the incoming call with a ringing display or a visual display.

Therefore, even if a large number of mobile stations are present in the system, only one radio channel is needed per base station, and the number of base station equipment can be greatly reduced. In addition, since the mobile station receives the incoming call on the common wireless channel, the incoming call delay time is greatly shortened as compared with the case where the control is performed to individually establish the wireless channel for each mobile station.

(2) If the base station side recognizes a mobile station that cannot receive a common radio channel and notifies the mobile station of the call state of the communication line through a separate radio channel, this is done. Even mobile stations can display the call status of other lines during communication.

(3) If the mobile station is configured to prohibit transmission using the communication line according to the call state of the displayed communication line or select the communication line to be transmitted according to the call state , For example, the mobile station monitors the line status,
By controlling so that other mobile stations do not make a call to the line being used, the wireless channel can be used effectively. For example, the mobile station monitors the line status and makes an open line when making a call. Calls can be prevented by making a call using.

(4) For example, it is assumed that the number of lines is too large and the radio channel does not have the capacity to transmit all the line states. Generally, for example, in a large-scale system, the lines used in the system are divided into multiple groups, and each group is specified in the tenant, etc. Often used in places. In such a case, by limiting the line pattern for transmitting the signal for each base station and appropriately installing the base station having a configuration for adding the identification information of the line pattern to the signal transmitted by the wireless channel, It is possible to notify the line status of a line required at a place by a radio channel having a low transmission capacity.

(5) Further, in the system including the base station having the configuration described in (4) above, the line pattern in which the mobile station notifies the call state from the base station and the line required by the mobile station. When the patterns do not match, the line pattern required by the mobile station is notified to the base station, and the base station side registers and deregisters the mobile station corresponding to the base station in response to the movement of the mobile station. If it is possible and the configuration is such that the registered mobile station notifies the required line pattern, for example, when the line pattern required in the wireless zone changes with time due to the movement of the mobile station,
The base station side dynamically changes the information of the line pattern to be notified, and the line pattern required by the mobile station can be notified on the common wireless channel or individual wireless channel in the system, and it also supports the movement of the mobile station. A feasible system is realized.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a functional block diagram conceptually showing the structure of a main part according to the gist of the present invention. As shown in the figure, the first call state notification unit 101 and the recognition unit 1 are provided on the base station side.
04, a second call status notification unit 105, a line pattern limiting unit 107, a line pattern identification unit 108, a mobile station registration / cancellation unit 111, and a second line pattern notification unit 112. Here, the base station side includes the base station itself and an exchange, for example. On the other hand, the mobile station includes a call status receiving unit 102, a call status display unit 103, a call control unit 106,
A line pattern determination unit 109 and a first line pattern notification unit 110 are provided.

The functions of the respective units in FIG. 1 will be briefly described. The first call state notifying unit 101 indicates the call state such as an incoming call of a communication line used in the system by a mobile station common to the system through a wireless channel. To notify. The call status receiving unit 102 and the call status display unit 103 receive and display the call status thus notified.

The recognizing unit 104 recognizes a mobile station that cannot receive the common control channel, and the second call status notifying unit 105 separates the mobile station recognized by the recognizing unit 104 from the individual radio channel. Is used to notify the call status of the communication line. The call status notified by the second call status notification unit 105 is also received and displayed by the call status receiving unit 102 and the call status display unit 103.

The call origination control unit 106 includes a call status display unit 103.
According to the call state of the communication line displayed by, the control for prohibiting the call using the communication line or selecting the communication line to be transmitted according to the call state is performed.

The line pattern limiting unit 107 divides the communication lines used in the system into a group of line patterns including a plurality of lines and limits the line pattern for transmitting a signal to each base station. Part 108
Is to add the identification information of the limited line pattern to the signal transmitted by the wireless channel.

The line pattern determination unit 109 determines whether or not the line pattern notified of the call status from the base station matches the line pattern required by the mobile station. The line pattern notification unit 110 When the mismatch is determined, the line pattern required by the mobile station is notified to the base station. Mobile station registration / cancellation unit 111
Is for performing registration and deregistration of a mobile station corresponding to the base station provided with this in response to movement of the mobile station, and the second line pattern notifying unit 112 requires the registered mobile station. For example, the switch is notified of the line pattern.

Note that each unit in FIG. 1 conceptually represents the function, and each unit does not necessarily have to be concrete hardware, and may be realized by software processing.

(Embodiment 1) FIG. 2 shows a concrete configuration example of a radio communication system according to an embodiment of the present invention. In FIG. 2, 10-1 to 10-5 logically represent communication lines, and it is not necessary that one cable is physically connected to one line. That is, the communication line referred to here corresponds to a logical number for making and receiving a call from the viewpoint of the mobile station. For example, assuming that the line 10-1 is connected to the PSTN network by a 2W cable, the line and the cable correspond to each other one to one. For example, if the line 10-2 corresponds to an extension telephone number, it has only a logical number and does not correspond to a physical cable.
If, for example, the lines 10-3 to 10-5 are compatible with the direct dial-in service, the line 10-
3 to 10-5 correspond to the numbers of outside lines.

The exchange 11 controls the origination control from the mobile stations 13a to 13c, the termination control to the mobile stations 13a to 13c, and the states of the communication lines 10-1 to 10-5 to the base stations 12a, 1c.
It controls the notification to 2b. In the following description, the communication lines 10-1 to 10-5, the base station 12a,
12b and the mobile stations 13a to 13c, if one of them is not specified, the communication line 10, the base station 12, the mobile station 1
Called 3.

Reference numerals 14a and 14b denote wireless zones. For example, the base station 12a controls the wireless zone 14a, and the mobile stations 13a and 1 are located in the wireless zone 14a.
Suppose 3b is present. Also, for example, the base station 12b
Is controlling the wireless zone 14b, and the wireless zone 1
It is assumed that mobile station 13c is present in 4b.

FIG. 3 is a diagram showing an example of a method of constructing a common wireless channel in the system in this embodiment. In the following, as an example, a method of performing communication on a downlink common control channel, which is a common radio channel in the system, at a single frequency f ₀ is shown. A method of avoiding mutual interference of the control signal transmission channel (downlink control channel) from each base station to the mobile station will be described with reference to FIG. For example, it is assumed that each base station is assigned with a slot capable of transmitting a control signal of a downlink control channel at a cycle three times as long as a signal transmission time (hereinafter referred to as a slot). This slot allocation can be realized by sending a synchronization signal from the exchange 11, for example. With this configuration, for example, up to three base stations can have a common control channel at the same place. Here, if the number of base stations that can be installed in the same place is called the number of clusters, the transmission cycle of the downlink channel control signal is 3
The number of clusters is not limited to double, and it is possible to configure any number of base stations in the same place by selecting the required number of clusters.

As a method of constructing the uplink common control channel, for example, there is a method of constructing using the uplink frequency f ₁ paired with the downlink frequency f ₀ . In FIG. 3, for example, it is assumed that each base station transmits a downlink signal at f ₀ and receives at the uplink frequency f ₁ in the next slot.

As a method of constructing the uplink control channel, not only the above method of dividing the frequency but also TDD (Time Divis)
There is also a method of using one frequency separately for upstream and downstream, as known as ion duplex).
In this case, of the uplink and downlink timings, only the downlink timings are collected and regarded as the downlink common control channel, so that the description using the pair of frequencies can be applied as it is.

Each base station is, for example, BCCH or LINEC.
It is assumed that control signals are periodically transmitted on the own control channel in the order of H, SCCH, and PCH. Here, BCCH is a channel for broadcasting the information of the radio channel, and PCH is a channel for transmitting an incoming signal. As will be described later, it is possible to make an incoming call by using LINECH. Since the PCH makes a call with a number unique to each mobile station 13, only one mobile station can receive a call.
Since INECH has an incoming call state as one of the line states, it is different in that it is possible to receive an incoming call to a plurality of mobile stations 13 that can receive the line state. The SCCH is a channel for transmitting to the mobile station 13 a channel assignment signal that specifies a channel used for a call. LINECH is a channel for transmitting a signal for displaying the line status.

The mobile station 13 can receive signals at the timing when the base station 12a sends a signal in the wireless zone 14a and at the timing when the base station 12b sends a signal in the wireless zone 14b. In the area where the wireless zones 14a and 14b overlap, both base stations 12a,
The control signal from 12b can be received. Therefore, even if the wireless zone changes as the mobile station 13 moves, it is possible to quickly receive the common control channel.

Since the line status is periodically displayed on the common control channel, the mobile station 13 can recognize the status of the line by receiving the common control channel and can display this line status. . As an example of the method of displaying the line status, for example, when the mobile station 13 has a number or character display device, there is a method of displaying the number corresponding to the line and its status. Further, for example, in the case of having a lamp corresponding to a line like a key telephone, there is a method of displaying the state of the line by the color or blinking of the lamp. It should be noted that the display method is not limited to the visual method, and there is also a method realized by, for example, transmitting sound from the mobile station 13 or vibrating the mobile station 13 itself in accordance with the communication line and its state.

FIG. 4 is a diagram showing an example of the LINECH signal structure and the line status in the signal. As shown in FIG. 14A, the LINECH signal includes a preamble 31 for obtaining bit synchronization of the signal, a synchronization word 32 for obtaining frame synchronization of the signal, BCCH, LINECH, SC.
A channel identification code 33 for identifying a channel such as CH, PCH, TCH, a unique base station number 34 for each base station, a line state 35 indicating the state of lines 10-1 to 10-5, and bits in a signal. It comprises an error detection code 36 for detecting an error. Each line status is displayed by, for example, the lines 10-1 to 10-as illustrated in the content of the line status 35.
5 states are arranged in order, and each line state is represented by, for example, 3-bit data as shown in FIG. 14 (b): "vacant", "communication", "incoming call from extension", "incoming call from outside line". During"
It can be realized by expressing "and" as "pending".

FIG. 5 is a sequence showing a method of receiving a call to the mobile station 13 and a method of displaying the line status. In this figure, for example, the exchange 11 notifies the base station 12 of the line status only when the line status changes. This can also be realized as a configuration in which the exchange 11 periodically outputs LINECH. In addition, FIG.
It is a figure which shows the line state in CH1-3.

The incoming sequence will be described below with reference to FIGS. 5 and 6 when there is an incoming call in the situation where there is a line under communication. When the exchange 11 receives an incoming signal of 16 Hz from the PSTN, the line state is changed and the line is changed to LINE.
CH2 is sent to the base station 12. Base station 12 is LIN
Until ECH2 is received, the line status of LINECH1 is transmitted from the call status notification unit 101 of FIG. 1 using the common control channel. As shown in FIG. 6A, LINECH
The line 10-1 in No. 1 shows an idle state, and as shown in (b), LINECH 2 shows that an outside line is being received. The base station 12 switches the LINECH 2 to the exchange 11
When it is received from, the line state is stored and the line state is notified to the mobile station 13 through the common control channel as described above. The mobile station 13 receives the common control channel from the base station 12 in a standby state in which no call or outgoing / incoming call control is performed.

As a method of receiving the common control channel in the mobile station 13, there are, for example, a method of always receiving and a method of receiving only the control channel required by the own station. As a concrete example of the latter, for example, the mobile station 13a is connected to the base station 12a.
The mobile station 13a will be described below.
When it is necessary for the receiver to receive BCCH, LINECH, PCH, etc., in the example of FIG. 3, for example, a battery saving technique in which the receiver is turned on once every three slots is applicable. Further, when only LINECH is required to be received, the receiver may be turned on once in 12 slots. By doing so, it is possible to reduce power consumption while the mobile station 13 is on standby.

With this method, the LIN from the base station 12 is received while the mobile station 13 is receiving the common control channel.
When the ECH2 is received by the call status receiving unit 102 of FIG. 1, the call status display unit 103 displays the line status.
The call status display unit 103 may display only the lines 10-1 to 10-3, for example, because of restrictions on the shape and weight of the mobile station 13. Further, when the mobile station 13 combines the method of visually displaying the line status by blinking a lamp or the like and the method of displaying by sound, it is not necessary to display all lines by lamp and sound. For example, lines 10-1 to 1
It is also possible to display lamps and sounds for 0-3, only lamps for the line 10-4, and only sounds for the line 10-5. This distinction can be made, for example, by the mobile station 13 presetting and storing the line for which a lamp is displayed among the lines 10-1 to 10-5 and its line state, and the line that emits a sound and its line state. Become. As this setting method, there is a method of inputting by operating the button of the mobile station 13, for example.

Next, returning to FIG. 5, an incoming call answering method will be described.

At the mobile station 13a displaying the incoming call, the line 10-
An example of responding to the incoming call of 1 will be described. To answer the incoming call,
The operator of the mobile station 13a selects the line 10-1 displaying the incoming call. Here, if the operator selects the line 10-3,
The call is sent using the line 10-3. As a method of selecting a line, for example, when a display device capable of displaying numbers and characters is used, a method of displaying the line number on the display device and selecting with a cursor key or the like can be considered. After that, the selected line can be controlled differently from the normal display. For example, when the selected line becomes busy, the red lamp is normally displayed, whereas the green lamp is displayed. This can be done, for example, by storing the line selected by the mobile station 13 until the call ends or until an instruction from the base station 12 side and changing the display.

When the operator selects the line number to respond to the incoming call, the mobile station 13a sends out an incoming call response signal including the number of the line to be answered. The base station 12a relays the incoming call response signal to the exchange 11. When the exchange 11 receives the incoming signal, it determines which line the incoming call response is from the line number in the signal. Then, the exchange 11 responds to the call from the PSTN by closing the loop, sends an ACK signal to the base station 12a to accept the response, and performs switch control to set the communication path. To do. Upon receiving the ACK signal, the base station 12a transmits a channel assignment signal to the mobile station 13a on the SCCH, designates a call channel, and thereafter starts a call with the mobile station 13a on the designated channel.

Upon receiving the channel designation signal, the mobile station 13a starts communication on the designated channel. Exchange 1
No. 1 sends a LINECH 3 to the base station 12 when the call is started on the line 10-1, because the line state changes. As shown in FIG. 6C, the line 10-1 in the LINECH 3 shows a busy state. At this time, since the mobile stations 13b and 13c are receiving the common control channel, the state of LINECH3 is displayed. The above is the method of controlling the incoming call when the mobile station 13 receives an incoming call and the mobile station 13
It is the display method in.

(Embodiment 2) FIG. 7 is a diagram showing a sequence when the mobile station 13a receives a call to the line 10-2 while talking on the line 10-1. In addition, FIG. 8 shows LINE
FIG. 9 is a diagram showing an example of a signal state of the in-call control channel TCH, while FIG. An embodiment of a method for displaying the line status to the mobile station 13a that cannot receive the common control channel will be described with reference to FIGS.

When the exchange 11 receives an incoming call on the line 10-2, the line state is notified to the mobile stations 13b and 13c by using the LINECH 4 as described above. As shown in FIG. 8A, the line 10-1 in LINECH 4 indicates that a call is in progress, and the line 10-2 indicates that an extension call is in progress. As a method of notifying the mobile station 13a, an individual radio channel,
For example, there is a method in which the exchange 11 notifies the line status by using a control channel during a call which is associated with the call channel. A specific example is shown below.

As shown in FIG. 9, the control channel during a call includes a preamble 81 for bit synchronization of signals, a synchronization word 82 for frame synchronization of signals, and a BCC.
A channel identification code 83 for identifying a channel such as H, LINECH, SCCH, PCH, TCH, and a control signal 8 during a call which is a control channel attached to the call channel.
4, an audio signal 85 and an error detection code 86 for detecting a bit error in the signal.

The types of mobile stations 13 include, for example, mobile stations that can receive the common control channel during a call and mobile stations that cannot receive the common control channel. The former is a mobile station which has a high-speed synthesizer capable of frequency switching for each slot of a wireless section and can receive a common control channel of a slot which does not overlap with a slot of a communication channel.

Since the latter mobile station cannot receive the common control channel, the base station 12 notifies the mobile station of the line status using the busy control channel.
For example, it is assumed that the exchange 11 can recognize that the mobile station 13a cannot receive the common control channel during a call by the recognition unit 104 in FIG. 1 by setting. The recognition unit 104 can be realized by setting the recognition unit 104, for example, during installation work of the exchange 11.

The exchange 11 recognizes that the recognizing unit 104 cannot receive the common control channel with respect to the mobile station 13a.
The same line state as LINECH is periodically transmitted on the busy control channel, and the base station 12a transfers the busy control channel to the mobile station 13a as it is. In the mobile station 13a, the call status receiving unit 102 of FIG. 1 receives the line status on the control channel during a call and displays it on the call status display unit 103. In this way, even a mobile station that cannot receive the common control channel during a call can display the line status on the call status display unit 103.

In the above description, the exchange 1 is taken as an example.
In order to reduce the processing amount of 1, the recognition unit 104 recognizes whether the mobile station 13 can receive the common control channel during a call.
However, a method of notifying the line status to all the mobile stations 13 in communication using the control channel during communication may be used. Also, instead of controlling by the exchange 11, for example, there is a method in which the base station 12 notifies all the mobile stations 13 in the call of the line status using the control channel during the call.

According to the above method, the mobile station 13 receives the line 10 regardless of whether the common control channel can be received or not.
It is possible to display that there is an incoming call to -2. Here, assuming that the mobile station 13b responds to the incoming call to the line 10-2, for example, the call shifts to the same state as described with reference to FIG. The exchange 11 recognizes that the line 10-2 has transitioned to a busy state and sends LINECH5. As shown in FIG.
According to the line status in INECH5, the line 10-1 indicates that a call is in progress, and the line 10-2 also indicates that a call is in progress. The mobile stations 13a to 13c can receive and display this line status as described above.

(Third Embodiment) Next, as described above, the mobile station 1
An embodiment of a method for controlling the transmission from the mobile station 13 by the transmission control unit 106 in FIG. 1 in accordance with the line status notified to the mobile station 3 to effectively utilize the wireless line will be described. 10 and 11 show a control flow of transmission control in the mobile station 13.

Consider an example in which the mobile station 13 makes an outside line while waiting. Here, as a method of selecting the outgoing line, for example, a button is provided for the mobile station 13 for the line, and the operator selects the line by pressing the button, and the mobile station 13 selects an external line or an extension line for the line. There is a method of memorizing the distinction between the two and the like, and when the operator selects either one, the call is made by using the vacant line.

FIG. 10 shows a control flow of the latter method in which the mobile station 13 is provided with a button corresponding to a line and the operator selects the line by pressing the button. When the operator presses a button on the line 10-1 to make a call, the mobile station 13 verifies the stored line state of LINECH. For example, line 10 like line state of LINECH1
If -1 is vacant, the originating operation is performed. However, if a call is in progress, such as the line status of LINECH 5,
Since the line is busy, a busy tone (BT) is sent to the handset to prohibit the call. As a result, the transmission signal is not transmitted to the wireless channel even though the line is in use, and it is possible to effectively use the wireless line.

In FIG. 11, the mobile station 13 stores the distinction between the external line and the internal line corresponding to the line, and when the operator selects either the external line or the internal line, the call is made using the vacant line. Shows how. As a method of storing the distinction between the external line and the internal line corresponding to the line in the mobile station 13, there is a method of inputting by operating the button of the mobile station 13, for example. When the operator presses the outside line button, the mobile station 13 checks whether or not there is an available outside line in the line state of the stored LINECH. For example, line 10-2 is an extension line, line 10
-1, 10-3 to 10-5 are outside lines, and LINECH
In the case of the line state of No. 5, the mobile station 13 uses, for example, the line 10
Select -3 to make a call.

In addition, for example, as shown in FIG.
When -1, 10-3 to 10-5 are busy, a busy tone (BT) is sent to the handset because there is no available outside line. As a result, when making a call, the call can be made using the idle line and the call loss can be prevented.

(Embodiment 4) Next, an embodiment of a method of dividing a communication line between a base station and a mobile station into two groups of line patterns and limiting the line pattern used for each base station will be described.

FIG. 13 is a diagram showing a configuration example of the radio communication system according to this embodiment. In FIG. 13, it is assumed that the communication lines 120-1 to 120-10 are all outside lines. As in FIG. 2, the exchange 121 includes mobile stations 123a, 1
23b, it controls the outgoing call from 23b, the incoming control to the mobile stations 123a and 123b, and the control to notify the base stations 122a and 122b of the states of the communication lines 120-1 to 120-10. In the following description, the communication lines 120-1 to 120-1
120 to 10, base stations 122a and 122b, mobile station 12
3a and 123b are referred to as a communication line 120, a base station 122, and a mobile station 123, respectively, when either is not specified. Moreover, 124a and 124b have shown the wireless zone.

Now, the wireless zone of the base station 122a is 124
a and the mobile station 123a is assumed to be in this wireless zone 124a. Similarly, the wireless zone of the base station 122b is 124b, and the mobile station 123b is in the wireless zone 12b.
4b. Wireless zones 124a and 124
In b, it is assumed that the lines used are different because the floors and departments in the building are different, for example. here,
The wireless zone 124a uses the lines 120-1 to 120-5, and the wireless zone 124b uses the lines 120-6 to 120-.
Suppose 10 is used.

FIG. 14 shows the line pattern identification section 10 of FIG.
LINE with line pattern identification information added by 8
It is a figure which shows the signal structure of H, and the example of the line state in this signal. The LINECH signal includes a preamble 131 for obtaining bit synchronization of the signal, a synchronization word 132 for obtaining frame synchronization of the signal, BCCH, LINECH,
Channel identification code 133 for identifying a channel such as SCCH, PCH, TCH, a unique base station number 134 for each base station, a line pattern number 135 corresponding to a group number of grouped lines, and a line 120 A line state 136 indicating the state of the line indicated by the line pattern number, an error detection code 137 for detecting a bit error in the signal
Consists of.

The status display of each line is shown in FIGS. 14 (b) and 14 (c).
For example, the line state corresponding to the line pattern number 1 is configured by arranging the states of the lines 120-1 to 120-5 in order, and the line state corresponding to the line pattern number 2 is lines 120-6 to 120. The state of −10 is arranged in order and configured. As shown in FIG. 14 (d), the types of line status are, for example, 3-bit data, "vacant", "communication", "incoming from extension", "incoming from outside" and "hold". “Middle” and the like, and these are represented by 3-bit data.

Next, a method of limiting the line pattern transmitted by each base station by the line pattern limiting unit 107 of FIG. 1 will be described with reference to FIGS. Exchange 12
1 receives LINECHa2, L to the base stations 122a and 122b when there is an incoming call from the PSTN to the line 120-1, for example.
The signal of INECHb2 is transmitted. The base station 122 stores, for example, the line pattern number used by each base station. This can be realized, for example, by making an initial setting at system startup.

Then, in the base station, the line pattern identification unit 108 of FIG. 1 adds the line pattern identification information (line pattern number) limited by the line pattern limiting unit 107 to the signal to be transmitted by the radio channel and transmits it. . Here, for example, it is assumed that the base station 122a is set to send only the line pattern number 1 and the base station 122b is set to send only the line pattern number 2.

That is, the base station 122a is the exchange 121.
When LINECHa2 and LINECHb2 are received from LINECHa2, the line pattern number is checked and LINECHa2
Only 2 is transmitted on the wireless channel. Similarly, the base station 12
2b sends only LINECHb2 on the radio channel. The base station 122a sends LINECHa1 before sending LINECHa2. As shown in FIG. 16, the line 120-1 is idle in LINECHa1 and L
In INECHa2, the line 120-1 is receiving an outside line.

Upon receiving the LINECHa2, the mobile station 123a indicates that the line 120-1 is receiving an outside line. The base station 122b sends LINECHa1 before sending LINECHa2, and as shown in FIG. 16, there is no line change in LINECHa1 and LINECHa2. The mobile station 123a is LINECHa1, L
INECHa2 is received and it is displayed that all lines are idle.

In the above embodiment, the base station 122
Although the line pattern to be transmitted to the wireless channel is selected in step 1, the switch 121 may transmit only the signal of the necessary line pattern to the base station 122. For example, exchange 1
21 may send only LINECHa2 to the base station 122a and send only LINECHb2 to the base station 122b.

(Embodiment 5) Next, a method in which a mobile station moves and requests a line pattern required by the mobile station in a new wireless zone, and a line pattern is used by the base station side using a common control channel or an individual channel An example of a method of notifying the notification will be described.

FIG. 17 is a diagram showing the configuration of the radio communication system according to this embodiment, and the mobile station 123 in FIG.
The state where b has moved from the wireless zone 124b to the wireless zone 124a is shown. 17, the same parts as those in FIG. 12 are designated by the same reference numerals. Communication line 120-1
Assume that 120-10 are all outside lines. Also, FIG.
As in the case of 2, the wireless zone 124a is, for example, the line 1
It is assumed that 20-1 to 120-5 are used and the wireless zone 124b uses the lines 120-6 to 120-10.
The wireless zone of the base station 122a is 124a,
It is assumed that the mobile stations 123a and 123b are in this wireless zone 124a. Further, the wireless zone of the base station 122b is 124b, and the mobile station 1 is in the wireless zone 124b.
There is no 23b.

Here, it is assumed that the wireless zone 124a is a place such as a conference room where the line pattern required temporally changes. The wireless zone 124b is assumed to be a place where the line pattern does not change with time, such as an office. Therefore, in the wireless zone 124b, the same line pattern is constantly used, for example, the lines 120-6 to 120-12.
Since 0-10 is used, the line pattern notified by the wireless channel does not change even when the mobile station 123b moves to the wireless zone 124a.

However, in the wireless zone 124a, the mobile station 1
When 23b comes into the zone, lines 120-1 to 120
It is necessary to control not only -5 but also the lines 120-6 to 120-10 as a line pattern required by the mobile station 123b on the radio channel. In addition, the mobile station 123
When b returns to the wireless zone 124b as shown in FIG. 13, it is necessary to stop the notification of the line pattern of the lines 120-6 to 120-10.

A sequence for dynamically changing the line pattern required by the mobile station as described above will be described below with reference to FIG. In FIG. 18, the base station 122 is configured to send a necessary LINECH from the LINECH received from the exchange 121. For example, beginning Figure 1
3, the mobile station 123b is in the wireless zone 124b, and receives the LINECHb1 as shown in FIG. 16 from the base station 122b on the common control channel. From the base station 122a, the LINE as shown in FIG.
CHa1 is transmitted on the common control channel.

Here, it is assumed that the mobile station 123b has moved to the radio zone 124a as shown in FIG. in this case,
When the mobile station 123b receives the common control channel shown in FIG. 19, it cannot receive the signal from the base station 122b, and then can receive the signal from the base station 122a. The mobile station 123b changes the base station number 134 in the control signal from the base station 122a, and cannot receive the required line pattern number 2 even if it receives for a certain period of time. Therefore, in the mobile station 123b, the line pattern determination unit 109 of FIG. 1 determines that the line pattern notified from the base station does not match the line pattern required by the mobile station. Here, the mobile station 123b may detect only the change of the base station number in order to prevent forgetting to cancel the registration as described later.

Next, in the mobile station 123b, according to the determination result of the mismatch from the line pattern determination unit 109, as shown in FIG.
The first line pattern notification unit 110 of the base station 12
A LINE information request signal is sent to 2a. This L
The INE information request signal includes the mobile station 1 as shown in FIG.
Information of the line pattern (line pattern number = 2) required by 23b is included.

The base station 122a is a station whose line pattern number changes with time. When it receives a LINE information request signal from the mobile station 123b, it transmits this signal to the exchange 121 and requests the mobile station 123b and the LINE information request. Stores the line pattern indicated by the signal, and if there is a vacancy in the common control channel, LINECH of the line pattern
Is sent. This is, for example, as shown in FIG.
This is possible by alternately transmitting ECHa and LINECHb. In FIG. 20, the second of the slots transmitted by the base station 122a is the LINECHa slot.
The second is the LINECHb slot.

If there is no vacancy in the common control channel, there is also a method of establishing a TCH with the base station 122a and notifying the line status using an individual control channel such as the busy control channel 84. Further, when the base station 122a has a control channel unique to the wireless zone 124a, there is also a method of designating the channel to the mobile station 123b and receiving LINECHb of the channel.

In this way, in the mobile station, when the line pattern determination unit 109 of FIG. 1 determines that the line pattern of which the base station has notified the line state does not match the line pattern required by the mobile station. In the first line pattern notification section 110, the mobile station notifies the base station side of the line pattern required by the mobile station. On the side of the base station that has received this notification, the second line pattern notifying unit 112 of FIG. 1 notifies the line pattern required by the mobile station via a common wireless channel or individual wireless channel in the system. . As a result, the line status information notified by the base station can be dynamically controlled.

By the way, when the mobile station 123b returns to the wireless zone 124b, for example, notifying the unnecessary LINECHb from the base station 122a wastes the wireless channel, which is not preferable. Therefore, the registration cancellation method will be described below.

In FIG. 18, the exchange 121 is LINE.
When the information request signal is received from the base station 122a, a base station other than this base station 122a (here, the base station 122b)
The mobile station mobile signal is transmitted to. The mobile station mobile signal is a signal representing the mobile station that has moved (mobile station 123b in the example in the figure) and the line pattern required by the mobile station. Base station 1
Since 22b is set as a base station that constantly sends LINECHb, it sends LINECHb.
This setting is performed, for example, when installing the base station.

Next, a case where the mobile station 123b moves and moves to, for example, the wireless zone 124b will be described. In this case, as described above, the mobile station 123b cannot receive the common control channel of the base station 122a or the individual radio channel, and can instead receive the common control channel of the base station 122b. Therefore, as described above, the LINE information request signal is transmitted to the base station 122b.
The base station 122b constantly sends LINECHb,
Only the control for sending this signal to the exchange 121 is performed.

Upon receiving the LINE information request signal from the base station 122b, the exchange 121 sends a mobile station movement signal to a base station (here, the base station 122a) other than this base station 122b. When the base station 122a receives the mobile station mobile signal, the base station 122a receives the mobile station mobile signal and the line pattern indicated by the mobile station mobile signal, and the mobile station and the line registered (stored) by the mobile station registration / cancellation unit 111 in FIG. Matches the pattern,
If they match, the registration for that mobile station is deleted.
When the mobile station using the line pattern is not in the wireless zone, the transmission of the LINECH is stopped. In this example, when the base station 122a receives a mobile station movement signal, for example, the registration for the mobile station 123b is deleted and the transmission of LINECHb is stopped. In this way, it is possible to stop the notification of unnecessary LINECHb from the base station 122a and avoid wasteful use of the radio channel.

In the above embodiment, the mobile station registration / deletion unit 111 of the base station 122a automatically operates the mobile station 12a.
I registered and deregistered the line pattern with 3b.
The registration or deregistration process may be started manually.
Further, when deregistering in the wireless zone 124a of the base station 122a, the LINE information request signal and the mobile station movement signal to the exchange 121 are unnecessary.

Further, in the above embodiment, the LINECH required by the base station is narrowed down and transmitted. However, as shown in the fourth embodiment, the exchange 121 transmits only the signal required by the base station. Even if there is, it can be realized in the same way. In this case, the mobile station mobile signal is unnecessary, but it is necessary to send LINECHb from the exchange 121 to the base station 122a when registering the mobile station 123b.

[0085]

As described above, according to the present invention, the following effects can be obtained.

(1) The base station side notifies the call status of the communication line used in the system to the mobile station through a common wireless channel in the system, and the mobile station notifies the call status of the communication line notified. With the configuration of receiving and displaying, for example, when there is an incoming call on the line, it is possible to notify the incoming call to the mobile station through a common wireless channel without establishing a wireless channel for each mobile station. Yes,
Based on this, the mobile station recognizes that it is an incoming call to its own station, and can display the incoming call with a ringing display or a visual display.

Therefore, even when there are a large number of mobile stations such as 100 or more in the system, only one radio channel is required for each base station, and the base station equipment can be greatly reduced. . In addition, since the mobile station receives the incoming call on the common wireless channel, the incoming call delay time is greatly shortened as compared with the case where the control is performed to individually establish the wireless channel for each mobile station.

(2) If the base station side recognizes a mobile station that cannot receive a common radio channel and notifies the mobile station of the call state of the communication line on a separate radio channel, Even mobile stations can display the call status of other lines during communication.

(3) The mobile station is prohibited from making a call using the communication line according to the call state of the communication line displayed on the mobile station, or the communication line to be transmitted is selected according to the call state It is possible to effectively utilize the channel, and it is possible to prevent a call loss by, for example, the mobile station monitoring the state of the line and making a call using an idle line when making a call.

(4) When the number of lines is too large and the radio channel does not have the capacity to transmit all the line states, the line pattern for transmitting the signal is limited for each base station, and the identification information of the line pattern is set. By appropriately installing a base station having a configuration to be added to the signal transmitted by the wireless channel, it becomes possible to notify the channel status of the circuit required at the location by the wireless channel having the low transmission capacity.

(5) In a system including a base station having such a configuration, the mobile station moves when the line pattern of which the base station notifies the call state and the line pattern required by the mobile station do not match. The line pattern required by the station is notified to the base station, and the base station side enables registration and deregistration of the mobile station corresponding to the base station in response to the movement of the mobile station, and the registration is performed. If the line pattern required by the mobile station is notified, when the line pattern required in the wireless zone changes over time as the mobile station moves, the line pattern of the line pattern notified by the base station side can be changed. Information can be dynamically changed and the line pattern required by the mobile station can be notified on the common wireless channel or individual wireless channel in the system. It can be realized.

[Brief description of drawings]

FIG. 1 is a functional block diagram conceptually showing the structure of a main part of a wireless communication system of the present invention.

FIG. 2 is a diagram showing a configuration of a wireless communication system according to an embodiment of the present invention.

FIG. 3 is a diagram showing a configuration example of a common control channel.

FIG. 4 is an LI that is one component of a downlink common control channel.
The figure which shows the signal structure of NECH, and a line state example.

FIG. 5 is a diagram showing an example of an incoming sequence when the present invention is applied.

FIG. 6 is a diagram showing an example of line states in LINECH 1 to 3;

FIG. 7 is a diagram showing a sequence example when there is an incoming call when there is a line in communication.

FIG. 8 is a diagram showing an example of line states in LINECH 4 and 5.

FIG. 9 is a diagram showing a signal configuration example of a TCH which is one component of a communication channel.

FIG. 10 is a diagram showing an example of a control flow when a mobile station makes a call by designating a line.

FIG. 11 is a diagram showing an example of a control flow when a mobile station designates an internal line and an external line to make a call.

FIG. 12 is a diagram showing an example of a line state in LINECH6.

FIG. 13 is a diagram showing a configuration of a wireless communication system according to another embodiment of the present invention.

FIG. 14 is a LIN provided with means for identifying a line pattern.
The figure which shows the signal structure of ECH and the example of a line state.

FIG. 15 is a diagram showing LINECH in the case of limiting the line pattern transmitted for each base station.

FIG. 16: LINECHa1, LINECHa2, LI
A diagram showing an example of line pattern numbers and line states in NECHb1 and LINECHb2.

FIG. 17 is a diagram showing the configuration of a wireless communication system according to another embodiment of the present invention.

FIG. 18 is a diagram showing a sequence example for dynamically changing the line status to be notified.

FIG. 19 is a diagram showing a configuration example of a common control channel for transmitting a LINECH different for each base station.

FIG. 20 is a diagram showing a configuration example of a common control channel for transmitting two types of LINECH.

FIG. 21 is a diagram showing a configuration example of a wireless communication system for making a group call according to a conventional technique.

[Explanation of symbols]

10 ... Communication line 11 ... Switch 12 ... Base station 13 ... Mobile station 14 ... Radio zone 31 ... Preamble 32 ... Sync word 33 ... Channel identification code 34 ... Base station number 35 ... Line state 36 ... Error detection code 81 ... Preamble 82 ... Sync word 83 ... Channel identification signal 84 ... Call control signal 85 ... Voice signal 86 ... Error detection code 120 ... Communication line 101 ... First call state notification unit 102 ... Call state receiving unit 103 ... Call state display unit 104 ... Recognition Unit 105 ... Second call status notification unit 106 ... Origination control unit 107 ... Line pattern limiting unit 108 ... Line pattern identification unit 109 ... Line pattern determination unit 110 ... First line pattern notification unit 111 ... Mobile station registration / cancellation unit 112 ... Second line pattern notifying section 121 ... Switch 122 ... Base station 123 ... Mobile station 124 ... Wireless zone 200 ... communication line 201 ... exchange 202 ... base station 203 ... mobile station 204 ... radio zone

Claims (5)

[Claims] 1. In a wireless communication system for performing wireless communication between a base station and a mobile station, the base station side moves the call state of a communication line used in the system to a common wireless channel in the system. A call state notifying means for notifying the mobile station, the call state receiving means for receiving the call state of the communication line notified by the call state notifying means, and the call received by the call state receiving means for the mobile station. A wireless communication system comprising call status display means for displaying a status. 2. A wireless communication system for performing wireless communication between a base station and a mobile station, wherein a call state of a communication line used in the system is moved to the base station by a common wireless channel in the system. First call status notifying means for notifying a station, recognizing means for recognizing a mobile station that cannot receive the common wireless channel, and mobile station recognized by this recognizing means for not being able to receive the common wireless channel A second call state notifying means for notifying the call state of the communication line by a separate radio channel to the mobile station, and the mobile station of the communication line notified by the first and second call state notifying means. A wireless communication system comprising: call status receiving means for receiving a call status; and call status displaying means for displaying the call status received by the call status receiving means. 3. A mobile station is provided with a communication line for prohibiting transmission using the communication line according to the call state of the communication line displayed by the call state display means, or for transmitting according to the call state. 3. The wireless communication system according to claim 1, further comprising a transmission control unit for selecting. 4. A line pattern limiting means for dividing a communication line used in the system into a group of line patterns including a plurality of lines and limiting a line pattern for transmitting a signal to each base station on the base station side. 3. The wireless communication system according to claim 1, further comprising: a line pattern identification unit that adds the identification information of the line pattern limited by the line pattern limiting unit to a signal transmitted by a wireless channel. 5. A line pattern judging means for judging whether or not the line pattern of which the base station notifies the mobile station of the call status and the line pattern required by the mobile station, and the line pattern judging means. A first line pattern notifying means for notifying the base station of the line pattern required by the mobile station when it is determined that they do not match is provided, and the base station side registers the mobile station corresponding to the base station and its registration. Registration / deletion to release the mobile station in response to movement
The wireless communication system according to claim 4, further comprising: a releasing unit and a second line pattern notifying unit for notifying a line pattern required by the mobile station registered by the registering / releasing unit.