JP2622790B2 - Call channel reservation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication channel reservation system for a system cordless telephone comprising a wired telephone line and a mobile radio line.

[0002]

2. Description of the Related Art The configuration of a cordless telephone system is shown in FIG.
Alternatively, it is configured as shown in FIG. That is, 1 is a main device, 2a, 2b,... 2n and 4a, 4b,.
n is a connection device. Reference numerals 3a, 3b,..., 3n denote slave units of the cordless telephone. The operation of the above configuration will be described. 1 and 2 are connected to the main apparatus 1 in parallel, and in FIG. 1, connection apparatuses 2a, 2b,... Since the connection devices 4a, 4b,... 4n are the same in operation only in the connection method in which the connection devices 4a, 4b,... 4n are wired in series, only FIG. Each of the connecting devices 2a, 2b,... 2n has a unique area, has an overlapping area with an adjacent area, and is configured to be suitable for movement between the areas. FIG. 3 shows the arrangement of adjacent areas. In a cordless telephone call system, a call request (call connection request) from a cordless telephone or a call channel number reservation notification signal for designating a call channel from a connection device is made by a control channel, and then a telephone line of an actual cordless telephone is used. Is switched to the designated communication channel for communication. The communication channel is specified by each of the connection devices 2a, 2b,.
Since the connection devices 2a and 2b specify the same communication channel to the cordless handsets 3a and 3b as shown in FIG. 3, if the cordless telephones 3a and 3b If the area moves to the overlapping area of the area, interference occurs between the cordless telephone handsets 3a and 3b and the connection device 2b.

[0003] Reservation of a communication channel will be described. FIG. 4 is a diagram showing a reservation procedure. When an outgoing call request b (connection request) is transmitted from the cordless telephone handset 3n via the control channel, the connection device 2n that has received the control channel searches for a free communication channel (hereinafter referred to as carrier sense), and the main device 1 And sends out an available channel information and an outgoing request d signal to the line connected to. After accepting the transmission request d signal vacant channel information and the like, the main device 1 retrieves and notifies the connection device 2n that has made the connection request from the database .
One of the free communication channels stored and selected is selected to determine the reserved communication channel , and a response signal f indicating whether or not the communication channel is available is transmitted to the connection device 2n. If the signal indicates that there is no communication channel, the connection device 2n returns to the carrier sense c.
Execute If the communication channel is available, the connection channel is transmitted from the connection device 2n with the transmission response h signal on the control channel, and then switched from the control channel to the communication channel included in the transmission response f.
When the cordless telephone handset 3n receives the transmission response f signal in the control channel, it switches to the communication channel included in the signal and transmits the transmission completion j signal. The connection device 2n outputs the received signal to the main device 1 through the line as a transmission completion k signal, and upon receiving the signal, the main device 1 connects to a desired telephone line to enable talking.

In the connection method as described above, the connection device 2n designates a communication channel irrespective of the free communication channel data of the other connection devices 2 (a to n-1). There is. In addition, an unnecessary communication time is searched after an outgoing call request, so that unnecessary time loss occurs.

[0005]

As described above, when a connection device receives an outgoing call request (connection request) from a cordless telephone handset via a control channel, the connection device searches for a free communication channel and communicates with another connection device. Irrespective of the method of designating the communication channel, causes interference in the overlapping area with the adjacent zone, and furthermore, there is a large time loss in searching the communication channel every time a call is requested. The present invention aims to solve such a problem.

[0006]

In the present invention SUMMARY OF THE INVENTION The connection device by searching for vacant speech channel, vacant the searched
Communication channel data and communication channel reservation request to main unit
Free call channel data sent out and broadcast from main unit
And a memory for storing call channel reservation information.
You. The main unit is the idle communication channel data from all connected units.
And the reserved call channel specified by the call channel reservation request.
Memory for storing the
Means for notifying all connection devices are provided. Cordless
The connection device receives a call request for connection specification from the handset of the telephone
Then, the main unit issues a connection request for the communication channel
And with the permission of the main unit , connect with the call channel
It is a method to do .

[0007]

When each connection device is set to the control channel, it searches for a free communication channel, and sends out free communication channel information to the main device each time. The main device manages the idle communication channel information and the communication channel reservation information, and notifies all the connected devices. Upon receiving the call request of the cordless telephone handset (call channel connection request), the connection device sends a call request signal to the main device, and the main device confirms the call from the handset via the connection device. To the machine. At this time, the connection device adds the information of the reserved communication channel to the transmission confirmation signal and transmits the signal, thereby establishing the connection on the reserved communication channel. Also, when receiving new reservation information from the connection devices, the main device changes the memory data of the communication channel reservation information, and notifies all the connection devices accordingly.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the cordless telephone system configuration diagram of FIG. Although not shown, main unit 1 has a circuit connection control means for connecting a cordless telephone handset and a telephone line, a memory for storing idle communication channel data and communication channel reservation data, and responding to a request from the memory data. Communication channel reservation means for designating a communication channel reservation. The connection devices 4 (a to n) connected in series from the main device 1 are connected to the cordless telephone handset 3 (a to n) via a wireless line, and are connected to the main device 1 via a wireless connection.
It includes a wired connection means, a means for searching for an available communication channel, and a memory for receiving and storing communication channel reservation data from the main device 1 for this search.

The operation of the above arrangement will be described with reference to the flowchart of FIG. First, the connection device searches for an available communication channel using carrier sense. If there is a free communication channel, the free communication channel information is sent to the main device 1. The main device 1 searches the reservation status of the communication channel stored in the database, and if there is a need to change according to the received free communication channel, the free device is used. Change and rewrite the communication channel, and if
The storage of the database reservation is changed, and the connection device 4 (a to
The idle communication channel information and the reservation information are transmitted to all of n), and the connection devices 4 (a to n) rewrite and store the memory contents. Passable band display Connections for which reservation of sum channel has been accepted
The device 4 (a to n) collects the carrier sense of the communication channel.
Of a call channel designation request from a slave unit of a telephone
Perform until requested . This call reservation method is not a specific method but may be a well-known method. For example, if the communication channel is 12 channels, starting from address 0 of the memory, B
Addresses are stored in order up to the address, bits are set corresponding to the channel reserved for the call or the channel being used, and in the case of a vacant channel, the bit is released so that it is possible to judge whether the channel is vacant. In addition, the allocation of the communication channel in response to the connection request may be performed by searching a memory address where no bit is set in the memory address in the above-mentioned memory address. Reservations may be allocated in order from. As described above, writing and reading to and from the memory may be performed by any known method. Next, the change information of the reservation status is
Report to all of (a to n). Then, use of the reserved call channel is confirmed. The above is the outline of the cordless telephone system.

The flow of this system will be described in detail with reference to the flowchart of FIG. 1) Immediately after power-on (after system initialization), the connection device performs carrier sense of the communication channel to obtain an empty channel number. 2) The connection device uses the communication channel number obtained in item 1 as the main device 1
To request a reservation for the call channel. 3) The main device 1 checks the channel number received from the connection device with the reservation channel number of the other connection device in the database, and returns a reservation impossible to the connection device if the reservation has been made, and returns a reservation possibility to the connection device if the reservation is not scheduled. If the reservation is possible, the fact is registered in the database. 4) When there is a change in the communication channel reservation table on the database, the main device 1 notifies all connected devices of the current communication channel reservation status information. 5) The connection device has received the traffic channel reservation status information to hold the data, reservation designated call channel is a carrier sense line Nau as no heavy <br/> double. 6) Return to item 2 above. By performing the above processing, when a transmission request is received from the slave unit, it is not necessary to perform carrier sense at that time, and the transmission processing can be performed quickly. FIG. 7 is a call channel reservation sequence diagram for understanding the flowchart of FIG.

FIG. 8 is a diagram showing a radio circuit confirmation means including a speech channel reservation according to the present invention. The operation procedure will be described with reference to the drawings. First, the cordless handset is
A transmission request b signal for designating a communication channel is transmitted. When the connection device receives this signal, it sends a signal of a transmission request to the main device via the line. In the main device, all connection devices 2
A communication channel that does not cause interference is selected and specified from the memory data of all available communication channels (a to n-1) and the communication channel reservation memory data, and a transmission confirmation n signal including the communication channel number is transmitted to the connection device. Interference can be avoided in the case of adjacent connection devices because they occur at overlapping areas. After transmitting the transmission acknowledgment signal on the control channel from the connection device, the control device switches from the control channel to the reserved communication channel. The cordless telephone handset receives the above-mentioned signal, switches to the reserved communication channel, and transmits a transmission completion q signal on the communication channel. The connected device that has received the signal transmits a transmission completion r signal to the main device via the circuit, and is brought into a talk-enabled state. Therefore, in the call state, communication is performed between the cordless telephone handset and the connection device, so that the communication reservation is terminated with the end of the communication, and thereafter the reserved communication channel is also subjected to carrier sense. As described above, there is no need to search for a free communication channel after a call request for specifying a communication channel from a cordless telephone handset.

[0012]

As a method for reserving a call channel, the connection device requires a call channel designation transmission from a cordless telephone handset.
Regardless determined, always searching for a free speech channel Yes and sent out to the main unit, the main unit a new reservation call channel information updated every designated traffic channel since it is a method of notifying all the connection apparatus, call There is no need for a search time for a free communication channel in a call request for specifying a channel, and by transmitting communication channel reservation information to all the connected devices, interference in an overlapping area of an adjacent zone is prevented. This has the effect of specifying the call channel.

[Brief description of the drawings]

FIG. 1 is a block diagram of a cordless telephone system.

FIG. 2 is another configuration diagram of a cordless telephone system.

FIG. 3 shows adjacent areas of a cordless telephone system.

FIG. 4 is a sequence diagram of a wireless line connection of a conventional cordless telephone system.

FIG. 5 is a flowchart showing an outline of wireless line connection of the present invention.

FIG. 6 is a flowchart of the operation of the connection device and the main device of the present invention.

FIG. 7 is a diagram of a communication channel reservation sequence.

FIG. 8 is a diagram of a wireless securing procedure including a communication channel reservation according to the present invention.

[Description of Signs] 1 Main device 2 (a to n) Connection device 3 (a to n) Cordless telephone handset 4 (a to n) Connection device

Claims (1)

(57) [Claims] 1. A cordless telephone system in which a main device for controlling a line connection between a telephone line and a plurality of connecting devices and the connecting device wirelessly connect a cordless telephone handset to perform telephone communication. free speech channel information broadcast et put the plurality of connecting instrumentation is, and a memory for storing the reservation information of the speech channel, reservation is needed traffic channel
Includes a reservation control means for determining the reserved traffic channel by searching the memory data and receiving a demanded informing said plurality of connection devices, the plurality of the connection device, always vacant communication channel is in operation in the control channel Locate and the includes a means for sending a reservation request traffic channel and idle speech channel data to the main device, and a memory for storing the reservation information transmitted from the main device, the connection device cordless phone child If there is machine or we connect request, and notifies the connection request to the main unit
To notify the reserved call channels being memory to the handset of the cordless telephone Te, reservation scheme of traffic channel handset of the cordless telephone on the specified speech channel, characterized in that the communicating telephone lines.