JPH01290324A - Communication method - Google Patents

Abstract

PURPOSE:To eliminate the need for the management of terminal equipment operating state information by using a broadcast type transmission line so as to call all terminal equipments and allowing each terminal equipment to judge whether or not a connection opposite destination number is the user of the relevant terminal equipment. CONSTITUTION:A connection controller 1 sends a terminal call signal with a user number being an opposite connection destination represented by a call setting signal superimposed thereupon to lots of unspecified terminal equipments 15 via a broadcast type transmission line 10. Each of many unspecified incoming terminal equipments 15 receives a terminal equipment call signal and judges whether or not the user number of the connection destination represented in the signal is coincident with the user number of a composite key data of an information card 21 set to its own terminal equipment by the user, its terminal equipment becomes an incoming terminal equipment when they are coincident and the call setting reception signal is sent to the connection controller 1 through an individual connection transmission line 9 via an individual connection type communication control section 19. The controller 1 receives a call setting reception signal from the incoming terminal equipment 15 to decide the incoming terminal equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication method in a communication system that allows movement of users.

[Conventional technology]

Traditional communication systems that allow user movement, e.g.
r communication system J (Japanese Patent Application No. 62-222470), in order to determine which terminal to call based on the user number of the connected party indicated by the call setting signal sent from the calling terminal, the user moves and uses a new terminal to call. Each time a user number is set on a terminal to be used, the terminal sends the terminal location information of the terminal and the user number currently set on the terminal to the connection control device using the individual connection type transmission path, A set of the user number and terminal location information is stored in the connection control device, and the data is used to set up a call for an individual connection type transmission path between the originating terminal and the terminating terminal.

[Problem to be solved by the invention]

In conventional technology, in order to determine which terminal to call based on the user number of the connection destination indicated by the call setup signal sent from the calling terminal, the terminal location information stored in the connection control device and the user number are used. The call was set up by converting the user number of the connected party indicated in the call setting signal into terminal location information. In addition, in order to store a pair of terminal location information and user number in the connection control device, each time the user moves, the pair of user number and terminal location information to be used after moving is stored in the connection control device. Sending out. Therefore, ■The connection control device needs to manage pairs of terminal location information and user numbers. ■Regardless of whether or not there is communication between terminals, users move and set user numbers on the terminals they use. At the same time, there was a problem in that communication was required from the terminal to notify the connection control device of the terminal location information and user number of the terminal.

The present invention solves these problems, eliminates the need for a connection control device to manage pairs of terminal location information and user numbers, and allows users to move and set user numbers on the terminals they use. It is also unnecessary to notify the connected control device of this,
The purpose is to provide a method of communication.

[Means to solve the problem]

In the present invention, when determining a called terminal to perform call setup based on the user number of the connection destination indicated in the call setup signal sent from the calling terminal, the connection control device A terminal calling signal carrying a user number is sent to an unspecified number of terminals via a broadcast transmission path, and each of the unspecified number of terminals receives the terminal calling signal and calls the connection partner indicated therein. Determines whether the user number matches the user number set by the user on its own terminal, and if they match, the own terminal becomes the receiving terminal and sends a call setup acceptance signal to the connection control device via the individual connection transmission path. However, the connection control device receives a call setup acceptance signal from the terminating terminal via the individual connection transmission path, and thereby determines the terminating terminal.

[Effect]

In the present invention, a terminal calling signal carrying the user number of the connection destination indicated by the call setting signal is sent to the broadcast transmission path, and all unspecified number of terminals are called, and each terminal determines whether or not its own terminal is complete. Since the determination is made on the terminal, the user number only needs to be managed on each terminal, and is not required on the connection control device.Also, since the connection control device does not manage the user number, it can be used for terminals that users move and use. Even if a user number is set, it is not necessary to notify the connection control device of the user number.

〔Example〕

FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, 1 is a connection control device.

This includes a CPU 2, a second memory 3, an encryption processing section 4, an individual connection type communication control section 5, a broadcast type communication control section 6, and a storage section 7.
It consists of 8 is a data table (encryption key management table) of pairs of user numbers and encryption keys corresponding to the user numbers, which is stored in the storage unit 7.

Reference numeral 9 denotes an individual connection type transmission path (in this case, a transmission path that connects a connection control device and a terminal in a one-to-one relationship and transmits information; for example, a transmission path that constitutes a public telephone network or a public packet network). 10 is a broadcast type transmission channel (transmission that allows broadcast information to be transmitted to all broadcast destinations in one transmission, instead of individually transmitting the same number of broadcast destinations) This includes transmission channels that make up CATV networks and digital communication networks with broadcasting functions.

In the case of a digital communication network having a broadcasting function, it has the functions of both an individual connection type transmission path and a broadcasting type transmission path, so it can be physically implemented using one type of transmission path.

Reference numeral 11 denotes a transmitting terminal, which is composed of a CPU 12, a ROM 13 (storing terminal position information of the terminal), and an individual connection type communication control section 14.

Reference numeral 15 denotes a receiving terminal, which includes a CPU 16, a ROM 17 (accumulating terminal location information of the terminal), a decoding processing section 18, an individual connection type communication control section 19, a broadcasting type communication control section 20, and an information card 2.
1 (data of a set of user number and corresponding decryption key 2)
The operation of this embodiment will be explained below. A call setup signal (the format of which is shown in Fig. 2) is transmitted from the calling terminal 1 through the individually connected transmission path 9, carrying the user number of the connected party, 1 the terminal location information of the calling terminal, and 5 the user number of the calling party. The connection control device 1 receives this via the individual connection type communication control section 5 and transmits a call setting request to the CPU 2.

The CPU 2 assigns a call number as an identification number for this communication, and partially stores this call number, the terminal location information of the calling terminal, the user number of the caller, and the user number of the connected party as a set in the memory 3. I'll keep it.

Next, the CPU 2 sends a terminal calling signal (the format of which is shown in FIG. 3) containing the user number 2 of the caller and the user number of the caller (user number 2 of the connection destination in the call setup signal). It is generated and sent to the broadcast type transmission path 10 using the broadcast type communication control unit 6.

In the receiving terminal 15, when a terminal calling signal is sent via the broadcast transmission path 10, the broadcast type communication control unit 20 takes it in and reads the user number and information card 21 of the connected party in the terminal calling signal. If they match, a terminal call request is sent to the CPU 16.

Next, the CPU 16 uses the call number in the terminal call signal and the RO
Call setup acceptance signal (4th call setting reception signal carrying terminal location information in M17
(Please refer to the format shown in the figure) and sends it to the individual connection type transmission path 9 using the individual connection type communication control unit 19.

The connection control device 1 receives this via the individual connection type communication control unit 5 and notifies the CPU 2 of acceptance of call setting. The CPU 2 then uses the terminal location information of the called terminal in the call setup acceptance signal and the calling terminal that is stored in the next memory 3 and is paired with the same call number as the call number in the call setup acceptance signal. The call is connected using the terminal location information. From then on, as in conventional communication systems, information from the calling terminal is sent to the called terminal based on the terminal location information of the called terminal (using an individual connection type transmission path, and conversely, information from the called terminal is sent to the called terminal based on the terminal location information of the called terminal). Communication can be performed by sending data to a calling terminal using an individual connection type transmission path based on terminal location information.

If communication is performed using the same transmission path (path) used for the call setup signal and call setup acceptance signal, the connection control device will be able to The terminal position information of the calling terminal 1 and the receiving terminal is implied by the accommodation position of the connected transmission path). In such a case, there is no need to set the terminal location information of the calling terminal 2 and the receiving terminal in the call setting signal and the call setting acceptance signal.

Please refer to FIG. 5, which summarizes the operations of this embodiment described above in a flowchart.

Further, since the called terminal is called through the broadcast transmission path 10, an erroneous connection or an unauthorized connection may occur in which a terminal other than the desired calling terminal accepts the call setting. To prevent this, first, the encryption processing unit 4 of the connection control device 1 encrypts the call number with the encryption key corresponding to the user number of the connection destination registered in the encryption key table 8 of the storage unit 7. , generates a terminal call signal containing the encrypted call number, the user number 2 of the connected party, and the user number of the caller, and sends it to the broadcast transmission path 10 using the broadcast communication control unit 6.

In the receiving terminal 15, when a terminal calling signal is sent via the broadcasting transmission path 10, the broadcasting communication control unit 20 takes it in and reads the user number and information card of the connected party in the terminal calling signal. Compare with the user number in 21,
If they match, a terminal call request is transmitted to the CPU 16.

Next, the CPU 16 uses the decryption processing section 18 to decode the information card 21.
The call number is decrypted using the decryption key inside, and a call setup reception number containing the decrypted call number and the terminal location information in the ROM 17 is generated, and the individual connection type communication control unit 19
is used to send the signal to the individually connected transmission path 9.

The connection control device 1 receives the call setup acceptance signal, determines whether some of the call numbers are in the memory 3 and is waiting for call setup reception (call number 2 terminal location information of the calling terminal 3 caller's usage). the user number and the user number of the connected party).

Even if a user enters a wrong user number or falsely sends a call setup acceptance signal to a terminal paging signal that is not addressed to the called terminal, the terminal will not be able to correctly decode the encrypted call number, and therefore The call number in the call setup signal sent by the terminal is different from the call number held by the connection control device (part of the data set including the call number in the call setup acceptance signal does not exist in the memory 3). This can prevent incorrect connections and unauthorized connections.

Here, in the encryption processing unit 4 in the connection control device 1, when the encryption key is Ke, the call number is N, and the encrypted call number is Nc, Nc=E (Ke, N). I do. Furthermore, the receiving terminal 15 performs decryption as follows, where Kd is the decryption key.

As an example of such an encryption/decryption method, Ke=K
dO is DBS (data encryption standard: Da
A public key method is known as a method in which Ke≠KdO (Ta Encryption 5 standard).

The data length of the call number is determined depending on the strength of prevention of erroneous connections and unauthorized connections.

The flowchart of the operation of the embodiment of preventing erroneous connections and unauthorized connections by encryption described above is the flowchart of FIG. 5 with the operation of FIG. 6 added, so please refer to FIG. 6 as well.

〔Effect of the invention〕

As described above, according to the present invention, in order to determine which terminal to call based on the number of the connected party in a communication system that allows users to move, a broadcast transmission path is used to call all terminals, Since each terminal determines whether the number of the connected party is the user of that terminal, there is no need for the connection control device to manage information about which terminal is currently being used by which user. This has the advantage that even if the user moves and changes the terminal used, there is no need to notify the connection control device of this fact.

Furthermore, if the terminal call signal using the broadcast transmission path is encrypted and sent using an encryption key corresponding to the user number, there is an advantage that erroneous connections and unauthorized connections can be eliminated.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the format of a call setting signal used in the embodiment, and FIG. 3 is an explanatory diagram showing the format of a terminal calling signal used in the embodiment. , FIG. 4 is an explanatory diagram showing the format of the call setup acceptance signal used in the embodiment, FIG. 5 is a flowchart showing the operation flow of the embodiment, and FIG. 6 is a diagram showing the error connection due to encryption.
FIG. 6 is an explanatory diagram of operations added in an example of preventing unauthorized connections. Explanation of symbols 1...Connection control device, 2...CPU, 3...-secondary memory, 4...Encryption processing unit, 5...Individual connection type communication control unit, 6...Broadcasting form communication control unit, 7...storage unit, 8...encryption key management table corresponding to the user number stored in the storage unit, 9...individual connection type transmission path, 10.
...Broadcast type transmission path, 11...Originating terminal, 12...C
PU, 13...ROM, 14...Individual connection type communication control unit, 15...Receiving terminal, 16...CF'tJ, 1
7...ROM, 1B...decoding processing unit, 19...
Individual connection type communication control unit, 20...broadcasting type communication control unit,
21... Information card, 22... User number of the information card holder stored in the information card and decryption key data corresponding to the user number Agent Patent attorney Akio Namiki Agent Patent attorney Matsuzaki Qing

Claims (1)

[Scope of Claims] 1) In a communication system comprising a calling terminal, a called terminal, and a connection control device that controls the connection between the two terminals, the connection control device receives a call setup signal from the calling terminal and connects the two terminals individually. When received via the broadcast transmission path, a terminal calling signal containing the user number of the connection destination indicated by the call setup signal is sent to unspecified multiple terminals via the broadcast transmission path. Each of the specific plurality of terminals receives the terminal call signal, determines whether the user number of the connection partner indicated therein matches the user number preset in the own terminal, and determines whether or not the user number matches the user number preset for the own terminal. In this case, the terminal becomes the receiving terminal and sends a call setup acceptance signal to the connection control device via the individual connection type transmission path between the two, and the connection control device that receives this transmits the call setup signal. A communication method characterized in that a call is set up via an individual connection type transmission path between the calling terminal and the called terminal based on a call setting acceptance signal.