JP3007499B2 - Mobile communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a mobile communication type outgoing / incoming connection control system. It is used for the outgoing / incoming connection control system of the digital car telephone system. In particular, the present invention relates to an outgoing / incoming connection control system for performing authentication of a mobile station using a short mobile station identification number in a mobile communication system.

[0002]

2. Description of the Related Art FIG. 22 is a block diagram of a mobile communication system. In FIG. 22, reference numeral 40 denotes a home memory which stores various information for each subscriber, and the storage content includes a mobile station identification number for identifying a mobile station held by the subscriber. Reference numeral 41 denotes an exchange for controlling a wireless line and a connection, and is connected to a general telephone network and another mobile communication network. Reference numeral 42 denotes a base station provided with a codec, a modulator / demodulator, and a signal transmitting / receiving means for communicating with a mobile station via a wireless line.

FIG. 23 is a diagram showing a configuration of a mobile station identification number in a mobile communication system. In FIG. 23, the mobile station identification number is composed of three number elements, 50 is a country code indicating the nationality to which the mobile station is subscribed, and 51 is a communication for identifying a communication carrier to which the mobile station is subscribed. The carrier number 52 is an individual number for identifying a mobile station within each communication carrier.

Conventionally, in the mobile communication system, outgoing / incoming connection control is performed by a method as described below. That is, when the incoming call request including the destination subscriber number arrives at the exchange 41 from the general telephone network or another mobile communication network, the exchange 41 transmits the destination subscriber number to the home memory 40. I do. The home memory 40 retrieves information on the destination mobile station held by the subscriber based on the received subscriber number, and transmits the information to the exchange 41. The exchange 41
A mobile station identification number consisting of all the number elements in the received information is included in the incoming signal. And the exchange 41,
An incoming signal is notified to the service area under its control via a plurality of base stations 42. The mobile station 43 located in the service area and receiving the incoming signal checks whether the mobile station identification number included in the incoming signal matches the mobile station identification number stored in the own station. If they do not match, the mobile station 43 recognizes that it is not an incoming call to its own station and does not operate. If they match, the mobile station 43 recognizes that there is an incoming call to its own station, and transmits a response signal to the exchange 41 via the base station 42.

[0005] Upon receiving the response signal, the exchange 41 uses the encryption key in the information received from the home memory to determine whether the mobile station that transmitted the response signal is a legitimate mobile station. Is a legitimate mobile station, and performs call connection control between the terminating mobile station and the network that has notified the termination.
If the authentication is not successful, the mobile station returning the response signal is determined to be not a valid mobile station, and the incoming connection is terminated. The above is the conventional incoming connection control method. Outgoing Connection Control Method Upon receiving a destination subscriber number and a transmission command from the user, the mobile station 43 transmits a destination subscriber number and its own mobile station identification number including all number elements shown in FIG. Include in. Then, a transmission signal is transmitted to the exchange 41 via the base station 42.

The exchange 41 transmits the mobile station identification number in the received outgoing signal to the home memory 40, and stores the destination subscriber number in the outgoing signal. The home memory 40 having received the mobile station identification number searches for information on the mobile station having the mobile station identification number, and transmits the information to the exchange 41. Upon receiving the information of the mobile station from the home memory 40, the exchange 41 authenticates the mobile station that transmitted the outgoing signal using the encryption key included in the information in the same manner as in the case of the incoming call. When the authentication is successful, the exchange 41 determines that the originating mobile station is a legitimate mobile station and sends an incoming call notification to the network indicated by the called subscriber number. If not successful, it is determined that the originating mobile station is not a legitimate mobile station, and the originating connection is terminated. The above is the conventional outgoing connection control method.

[0007]

However, in such a conventional mobile communication system, a mobile station identification number including all number elements shown in FIG. 23 is always used, and some number elements are omitted. There is a disadvantage that the mobile station identification number cannot be used. In consideration of the fact that frequency resources are limited in mobile communication and that signal transmission reliability of wireless transmission is much lower than that of wired transmission, it is desirable that the control signal transmitted wirelessly is short.

The present invention solves the above-mentioned drawbacks, and can use a short mobile station identification number omitting some number elements, reduce the number of control channel signals required for transmission and reception, and improve the frequency utilization efficiency. It is an object of the present invention to provide a mobile communication system capable of improving transmission reliability and improving transmission reliability.

[0009]

A first aspect of the present invention is an incoming call connection control system of a mobile communication system. A plurality of mobile stations, comprising a switching network that communicates with the plurality of mobile stations, the plurality of mobile stations include mobile station control means for performing outgoing and incoming connection control,
The switching network includes a home memory for storing mobile station identification numbers and mobile station information of the plurality of mobile stations, and network control means for performing outgoing / incoming connection control, wherein the mobile station identification number is
A country code indicating the nationality to which the mobile station belongs, a communication carrier number for identifying the carrier to which the mobile station belongs, and an individual number for identifying the mobile station to which the mobile station belongs Wherein the network control means comprises network connection control means for transmitting to a mobile station with which communication is to be performed while omitting a partial number element of the mobile station identification number. The control means includes a mobile station comparing means for comparing the received mobile station identification number with its own mobile station identification number with some number elements omitted.

[0010] The second invention is an outgoing connection control system of a mobile communication system. A plurality of mobile stations, and a switching network for communicating with the plurality of mobile stations, wherein the plurality of mobile stations include mobile station control means for performing outgoing / incoming connection control, wherein the switching network comprises the plurality of mobile stations. A mobile memory for storing mobile station identification numbers and mobile station information, and network control means for performing outgoing / incoming connection control, wherein the mobile station identification numbers are a country code indicating a nationality to which the mobile station belongs. A mobile communication system comprising a communication carrier number for identifying a carrier to which the mobile station belongs and an individual number for identifying a mobile station to which the mobile station belongs; The means comprises a mobile station connection control means for transmitting the switching network with a partial number element of its own mobile station identification number omitted, and the network control means receives the part with the partial number element omitted. The mobile station that is located for the mobile station identification number Characterized in that a comparator determining network comparison means and the station identification number.

The network connection control means or the mobile station connection control means of the first invention or the second invention is also effective when changing the location registration of the home memory.

That is, the location registration of the home memory can be changed by omitting some number elements of the mobile station identification number.

Further, the first invention and the second invention can be used in combination.

A third invention is a mobile station device used in the above-mentioned system. In this apparatus, the mobile station control means transmits a mobile station identification number to the switching network by omitting a partial number element of the mobile station identification number, and the mobile station control means receives the partial number element without the number element. Mobile station comparing means is provided for comparing the mobile station identification number with its own mobile station identification number. This device can be traded separately as a commodity separately from the above-mentioned method.

[0015]

For example, when the communication carrier to which the switching network belongs and the communication carrier to which the mobile station located in the service area of the network belongs are the same, the mobile station belonging to one communication carrier belongs. Since there is only one individual number, the mobile station can determine whether the incoming signal is addressed to the own station based on the individual number, and the switching network can authenticate the mobile station. If there is only one other mobile station in the area, the mobile station can be identified only by the country code. Therefore, a short mobile station identification number omitting the country code and the carrier number can be used, the number of control channel signals required for transmission and reception can be reduced, the frequency use efficiency can be improved, and the transmission reliability can be improved. .

[0016]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an example of a mobile communication system according to the present invention. FIG. 2 is a block diagram showing an example of the home memory of the mobile communication system according to the present invention. FIG. 3 is a block diagram showing an example of the mobile station of the mobile communication system according to the present invention.

1 to 3, FIG. 22 and FIG. 23, the mobile communication system includes a plurality of mobile stations 43 and a mobile station 43.
Home memory 40, exchange 4 as an exchange network for communicating with
1 and a base station 42. The mobile station 43 includes a mobile station identification number forming circuit 30, a control circuit 31, a memory 32, and a mobile station identification number comparing circuit 33 as mobile station control means for performing call connection control. The memory 40 stores the mobile station 4
, A control circuit 22, an output circuit 23, and an input circuit 2.
The switching center 41 includes a mobile station identification number analysis circuit 10 and a control circuit 1 as network control means for performing call connection control.
1 and a mobile station identification number configuration circuit 12, wherein the mobile station identification number includes a country code 50 indicating the nationality to which the mobile station 43 belongs, and a communication business for identifying the communication business to which the mobile station 43 belongs. And a personal number 52 for identifying the mobile station 43 to which the telecommunications carrier belongs.

The mobile station identification number forming circuit 30 includes a circuit for forming a mobile station identification number included in the transmission signal, and a control circuit 3.
1 is a circuit for controlling the operation of the mobile station 43; memory 32 is a memory for storing its own mobile station identification number and other mobile station information; and mobile station identification number comparison circuit 33 is a mobile station identification number in the received call signal. This is a circuit for determining whether each number element of the number matches that of its own station.

Further, the mobile station 43 is connected to the exchange 4 by itself.
1 and a transmitting circuit 35 which encodes and modulates the output signal formed by the signal forming circuit 34 to form a signal to be transmitted to the radio line.
A receiving circuit 36 for demodulating and decoding the received signal from the radio line, a signal decomposing circuit 37 for decomposing the demodulated and decoded received signal, extracting necessary information and sending it to the control circuit 31. , A transmission / reception distribution circuit 38 for distributing a transmission signal or a reception signal, and an antenna 39.

The control circuit 21 controls the operation of the home memory 40 and searches for necessary information from the contents of the memory 22. The memory 22 stores mobile station information for each subscriber, and an input circuit. A circuit 24 synchronizes and inputs an input signal from the exchange 41 to its own station, extracts necessary information and sends it to the control circuit 21, and an output circuit 13 forms an output signal to the exchange 41. , And a circuit for synchronizing and sending it to the exchange 41. The memory 22 is assigned a storage area for each subscriber, and within the area, various information areas are further allocated. Such information includes the mobile station identification number held by the subscriber, whether this mobile station is a contracted mobile station or a non-contracted mobile station, and roaming (a service can be received even within a service area of a communication carrier other than the contracted communication carrier). That) information such as possible or impossible information is included.

Further, the mobile station identification number analyzing circuit 10 checks the number element of the mobile station identification number included in the transmission signal from the mobile station, and the control circuit 11 controls the operation of the exchange 41 and the mobile station. The identification number configuration circuit 12 is a circuit that configures a mobile station identification number.

The switching center 41 forms an output signal to an external node such as the home memory 40 or the base station 42, and outputs the signal to the external node in synchronization with the output circuit 13; And an input circuit 14 for synchronizing and inputting the input signal, and disassembling the input signal and transmitting necessary information to the control circuit 11.

Here, the feature of the present invention is that the network control means includes a network connection control means for transmitting to a mobile station 43 as a communication partner, omitting a partial number element of a mobile station identification number. The mobile station control means includes a mobile station comparison means for comparing the received mobile station identification number with its own mobile station identification number, with some number elements omitted.

Here, the network connection control means includes a control circuit 1
1 and the mobile station identification number configuration circuit 12. The mobile station control means is included in a control circuit 31, a memory 32 and a mobile station identification number comparison circuit 33.

The operation of the mobile communication system having such a configuration will be described.

FIG. 4 is a flow chart showing the operation of the mobile communication system according to the first embodiment of the present invention at the time of an incoming call. FIG.
FIG. 5 is a flowchart showing the operation of the mobile communication system at the time of an incoming call in the first embodiment of the present invention. FIG. 6 is a flowchart showing the operation of the mobile station in the mobile communication system according to the first embodiment of the present invention when receiving a call.

The incoming connection control will be described with reference to FIGS.

Japanese digital mobile communication system [RCR-
In the STD 27B (referred to as Radio System Development Center), the communication business to which the base station 42 having the service area under its control, the switching station 41, and the home memory 40 belong from the switching center 41 via the base station 42 at all times. Information for identifying a person is notified. The mobile station 43 receives this information, and sets the service area where the mobile station 43 is located to a service area (hereinafter, referred to as a service area) belonging to a communication carrier to which the mobile station 43 is subscribed.
Home area. ) Can be determined. In the present embodiment, when the exchange 41 performs outgoing / incoming connection control for a mobile station in a service area under its control, the mobile station having a service area under the control of the exchange 41 as a home area ( This is a method of performing outgoing / incoming call connection control using a mobile station number having only an individual number. The details are described below.

When a call request including the called subscriber number arrives at the exchange 41 from the general telephone network or the mobile communication network,
The control circuit 11 of the exchange 41 transmits the destination subscriber number to the home memory 40.

The control circuit 21 of the home memory 40 reads a plurality of pieces of information about the called subscriber from the memory 22 based on the received called subscriber number, and sends the information to the exchange 41.

The control circuit 11 of the exchange 41 receives, from the received information on the called subscriber, the mobile station identification number of the mobile station (hereinafter called the called mobile station) held by the called subscriber, and the contract. The information on the communication carrier and roaming permission / inhibition information are sent to the mobile station identification number configuration circuit 12. When the destination mobile station is a contract mobile station, the mobile station identification number configuration circuit 12 excludes the country code 50 and the communication carrier number 51 from the received mobile station identification number, and uses only the individual number 52 as the mobile station identification number. And sends it to the control circuit 11. If the destination mobile station is not a contract mobile station and roaming is possible, the mobile station identification number construction circuit 12 constructs a mobile station identification number including all number elements and sends it to the control circuit 11. If the destination mobile station is not a contracted mobile station and roaming is not possible, a signal indicating that reception is not possible is sent to the control circuit 11.

When the control circuit 11 receives the mobile station identification number from the mobile station identification number forming circuit 12, the control circuit 11 sends the received mobile station identification number to the output circuit 13 and commands the configuration of the incoming signal. The output circuit 13 configures an incoming signal including the received mobile station identification number and notifies the service area under its control via the base station 42. The control circuit 11
When an incoming connection failure is received from the mobile station identification number configuration circuit 12, the output circuit 13 configures a signal indicating that the connection is unavailable and sends it to the network that requested the incoming call.

Here, the switching center 41 constantly broadcasts a signal including information on the communication carrier to which the switching center 41 belongs to within a service area under its control via the base station 42. The mobile station 43 monitors this signal and always recognizes whether or not the own station is located in the home area.
You are registered with

The mobile station 43 that has received the incoming signal extracts necessary information in the signal decomposing circuit 37 and sends out the incoming signal to the control circuit 31. The control circuit 31 that has received the incoming signal
Sends the mobile station identification number contained in the incoming signal to the mobile station identification number comparison circuit 33. When the own station is located in the home area, the mobile station identification number comparing circuit 33 compares the individual number 52 of the own station with the received mobile station identification number, and notifies the control circuit 31 of a match or a mismatch. . Further, the mobile station compares the individual number 52 of the own station with the received mobile station identification number, and notifies the control circuit 31 of a match or a mismatch. If the own station is located in a service area other than the home area, the mobile station identification number including all the number elements of the own station is compared with the receiving mobile station identification number, and a match or mismatch is sent to the control circuit 31. Notice. When the mobile station identification numbers match, the control circuit 31 causes the signal configuration circuit 34 to configure a response signal and transmits the response signal to the exchange 41 via the base station 42. If the mobile station identification numbers do not match,
The control circuit 31 does not operate.

Upon receiving the response signal, the exchange 41 authenticates with the destination mobile station 43 in the same manner as in the prior art, and if the authentication is successful, calls between the network that has notified the incoming call and the destination mobile station. Make the connection. If the authentication fails, terminate the incoming connection.

FIG. 7 is a flowchart showing the operation of the mobile station in the mobile communication system at the time of calling according to the second embodiment of the present invention. FIG.
FIG. 7 is a flow chart showing the operation at the time of calling by the exchange in the mobile communication system according to the second embodiment of the present invention. FIG. 9 is a flow chart showing the operation at the time of transmission from the home memory of the mobile communication system according to the second embodiment of the present invention.

The outgoing connection control operation will be described with reference to FIGS. 1 to 3, FIGS. 7 to 9, 22 and 23.

As described in the first embodiment, the mobile station 43 always recognizes whether or not it is in the home area and registers it in the mobile station identification number comparison circuit 33.

When the control circuit 31 of the mobile station 43 receives the destination subscriber number and the transmission command from the user, it instructs the mobile station identification number forming circuit 30 to configure the mobile station identification number. When the own station is located in the home area, the mobile station identification number forming circuit 30 omits the country code 50 and the communication carrier number 51, forms a mobile station identification number consisting of only the individual number 52, and performs control. Transmit to the circuit 31. When the mobile station is not located in the home area, a mobile station identification number including all number elements is formed and transmitted to the control circuit 31. The control circuit 31 sends the received mobile station identification number and the called subscriber number input from the user to the signal forming circuit 34 to make up the outgoing signal.

The transmission signal formed by the signal configuration circuit 34 is transmitted to the exchange 41 via the base station 42. Exchange 4
The first input circuit 14 extracts the mobile station identification number and the destination subscriber number from the transmission signal and sends them to the control circuit 11. The control circuit 11 converts the mobile station identification number into the mobile station identification number analysis circuit 1.
Send to 0. The mobile station identification number analysis circuit 10 checks whether the mobile station identification number is composed of all the number elements or only the individual number, and notifies the control circuit 11. When the mobile station identification number in the outgoing signal is composed of only the individual number 52, the control circuit 11 recognizes that the originating mobile station is the contract mobile station of the own station, and is composed of all the number elements. If so, it recognizes that it is not a contracted mobile station. When the exchange 41 determines that the originating mobile station is a contracted mobile station, the exchange 41 adds the communication carrier number 51 and the country code 50 of the communication carrier to which the own station belongs to the mobile station identification number in the transmission signal. The mobile station identification number is sent to the home memory 40. If the originating mobile station is not a contracted mobile station, the mobile station identification number in the originating signal is sent to home memory 40 as it is.

The control circuit 21 of the home memory 40 retrieves the mobile station information having the received mobile station identification number and sends it to the exchange 41. The control circuit 11 of the exchange 41 checks the contracted carrier information and roaming availability information out of the received information, and determines that the originating mobile station is not the contracted mobile station.
If roaming is not possible, the call connection is terminated. Otherwise, the originating mobile station is authenticated using the encryption key in the information received from the home memory 40. The authentication method is the same as the conventional method. If the authentication is successful, the exchange 41 connects the call between the originating mobile station and the destination subscriber. If the authentication fails, disconnect the call.

As described above, this embodiment is a method using the mobile station identification number from which the country code 50 and the communication carrier number 51 of the contracted mobile station are deleted. Since most of the mobile stations existing in the service area are considered to be contract mobile stations, this method using a short mobile station identification number of only the individual number 52 in notification of an incoming call to the contract mobile station is extremely difficult. It is effective for

The above description is based on the assumption that the country code 50 and the telecommunications carrier number are used when the telecommunications carrier contracted by the mobile station is the same as the telecommunications carrier providing the service in the service area where the mobile station is located. The method of omitting the country code 51 is similar to the method of omitting the country code 50 when the nationality to which the mobile station belongs is the same as the nationality of the service area where the mobile station is located. These two methods can be implemented simultaneously in one system.

FIG. 10 is a flowchart showing the operation of the mobile communication system according to the third embodiment of the present invention at the time of an incoming call at the exchange. FIG. 11 is a flowchart showing the operation of the third embodiment of the present invention at the time of incoming call of the home memory of the mobile communication system.
FIG. 12 is a flowchart showing the operation of the mobile station in the mobile communication system according to the third embodiment of the present invention at the time of an incoming call.

The incoming connection control operation will be described with reference to FIGS. 1 to 3, FIGS. 10 to 12, 22 and 23.

At present, the service area of the mobile communication is configured by arranging a plurality of areas (hereinafter, referred to as an incoming area) in which the same incoming signal is broadcast. Exchange 4
The information 1 is always informed of the information for identifying the called area for each called area so that the mobile station can identify the called area. Further, the memory 22 of the home memory 40 holds an area for storing in which receiving area the mobile station held by the subscriber is located. Is transmitted to the exchange 41 via the base station 42, and the exchange 41 registers this fact in the home memory 40.

In this embodiment, when the exchange station 41 notifies the incoming call, another mobile station having the same individual number 52 as that of the destination mobile station 43 in the reception area where the destination mobile station 43 is located. The home memory 40 is searched for the presence of a mobile phone. If the mobile phone is present, an incoming call is notified using the mobile station identification number including all the number elements. The operator number 51 is omitted, and the individual number 52
This is a method of performing an incoming call notification using only a short mobile station identification number. This will be described in detail below.

From the general telephone network or other mobile communication networks,
When an incoming request including the destination subscriber number arrives at the exchange 41, the control circuit 11 of the exchange 41 sends the destination subscriber number to the home memory 40.

The control circuit 21 of the home memory 40 reads a plurality of pieces of information on the called subscriber from the memory 22 based on the received called subscriber number. Further, the control circuit 21
Searches the memory for another mobile station having the same destination area of the destination mobile station and the individual number 52 included in the mobile station identification number in the information on the destination subscriber. The control circuit 21 transmits to the exchange 41 information on the presence or absence of the corresponding mobile station (hereinafter referred to as presence / absence information) and information on the destination subscriber. The control circuit 11 of the exchange 41 sends the mobile station identification number and the presence / absence information of the mobile station held by the called subscriber out of the received information to the mobile station identification number construction circuit 12. When presence / absence information is present, the mobile station identification number configuration circuit 12 configures a mobile station identification number including all number elements and sends it to the control circuit 11. In the absence, individual number 52
Only the mobile station identification number is formed and transmitted to the control circuit 11. When the control circuit 11 receives the mobile station identification number from the mobile station identification number construction circuit 12, the control circuit 11 sends the received mobile station identification number to the output circuit 13, and commands the configuration of the incoming signal. The output circuit 13 forms an incoming signal including the received mobile station identification number, and transmits the incoming signal to the exchange 41 via the base station 42.

The mobile station 43 that has received the incoming signal performs demodulation and decoding processing in the receiving circuit 36, and
At 7, necessary information is taken out and sent to the control circuit 31.
The control circuit 31 having received the incoming signal sends the mobile station identification number included in the incoming signal to the mobile station identification number comparing circuit 33. If the received mobile station identification number is equal to the length of the individual number, the mobile station identification number comparison circuit 33 checks whether or not the mobile station identification number matches the own station's individual number, and notifies the control circuit 31 of the mismatch. If the length of the received mobile station identification number is equal to the length of the mobile station identification number including all the number elements, it is checked whether or not the mobile station identification number includes all the number elements of the own station. Is notified to the control circuit 31. If the mobile station identification numbers match, the control circuit 31 causes the signal configuration circuit 34 to configure a response signal, and the base station 4
2 to the exchange 41. If the mobile station identification numbers do not match, the control circuit 31 does not operate.

Upon receiving the response signal, the exchange 41 performs the same authentication with the destination mobile station, and if the authentication is successful, establishes a call connection between the network that has notified the incoming call and the destination mobile station. Do. If the authentication fails, terminate the incoming connection.

As described above, in this embodiment, if there is no other mobile station having the same individual number 52 as the destination mobile station in the same destination area, the country code 50 and the communication carrier This is a method using a mobile station identification number with the number 51 omitted. Other mobile stations having the same individual number 52 as the destination mobile station should have different contracted carriers, and each mobile station is located in the service area of the contracted carrier. The frequency is high. Therefore,
The probability that another mobile station having the same individual number 52 does not exist in the same service area is very high, and naturally the probability that it does not exist in the same receiving area is very high. Therefore,
This method is a very effective means because a short mobile station identification number can be used with a high probability.

The above description is of a method of notifying the incoming call using the mobile station identification number of only the individual number 52 when there is no other mobile station having the same individual number. As a similar method, when another mobile station having the same individual number 52 and the same communication carrier number 51 does not have the same receiving area, the country code 50 is omitted and the communication carrier number is omitted. Also, a method of notifying the incoming call using the mobile station identification number constituted by the individual number 52 can be realized. It is also possible to implement these two methods simultaneously in one system.

FIG. 13 is a flowchart showing the operation of the mobile station in the mobile communication system at the time of calling according to the fourth embodiment of the present invention. FIG. 14 is a flow chart showing the operation at the time of calling by the exchange in the mobile communication system according to the fourth embodiment of the present invention. FIG. 15 is a flow chart showing the operation at the time of transmission from the home memory of the mobile communication system according to the fourth embodiment of the present invention.

The outgoing connection control operation will be described with reference to FIGS. 1 to 3 and FIGS.

In this embodiment, the mobile station learns the frequency of use for each element in the mobile station identification number of the mobile station.
This is a method of constructing a transmission signal using a mobile station identification number in which a number element used less frequently is omitted. The details are described below.

When the incoming connection method of the third embodiment is used, the control circuit 31 of the mobile station counts the number of incoming connections for each incoming call area, and furthermore, the mobile station's mobile station used for the incoming call notification. It examines which number element the station identification number is composed of, counts the number of times of use for each number element, and stores it in the memory 32. Further, the exchange 41 registers the number of times of connection within a predetermined period up to the present in the home memory 40 for each mobile station and for each receiving area.

When the control circuit 31 of the mobile station receives the destination subscriber number and the transmission command from the user, the control circuit 31 accesses the memory 32 and extracts the number of times of reception and the number of times of use of each number element in the reception area in the service area. Identification number configuration circuit 3
Send to 0. The mobile station identification number forming circuit 30 calculates (number of uses) / (number of incoming connections) for each number element, and the mobile station identification number excluding the number element whose calculation result is equal to or less than a specified value (for example, 1/50). And sends it to the control circuit 31. The control circuit 31 receives the mobile station identification number,
The destination subscriber number is sent to the signal configuration circuit 34 to make up the outgoing signal.

The signal construction circuit 34 sends the constructed transmission signal to the exchange 41 via the base station 42. The input circuit 14 of the exchange 41 extracts the mobile station identification number and the destination subscriber number from the received transmission signal, and sends them to the control circuit 11.
The control circuit 11 sends the mobile station identification number to the home memory 40. The control circuit 21 of the home memory 40 searches for information on the mobile station having all the same number elements in the received mobile station identification number, and transmits the information to the exchange 41. Here, when the originating mobile station includes all the information in the mobile station identification number in the originating signal, only one mobile station is naturally searched and only that information is sent to the exchange 41.

If the mobile station identification number in the transmission signal does not include all the number elements, (only the individual number 52,
Alternatively, when only the carrier number 51 and the individual number 52 are included), a plurality of mobile stations are searched, and their information is sent to the exchange 41. The control circuit 11 of the exchange 41
If the information sent is the only mobile station, authentication is performed using the encryption key in the information, and if authentication is successful, the call is connected to the network of the called subscriber number. If the authentication fails, terminate the connection.

If the transmitted information is information relating to a plurality of mobile stations, the control circuit 11 of the exchange 41 checks the number of connections in the receiving area where the transmission signal was transmitted for the information of each mobile station. Authentication is performed sequentially from the mobile station with the largest number of connections, and a call is connected when the authentication is successful. If no mobile station has been successfully authenticated, the call is disconnected. Further, after making the call connection, the control circuit 11 of the exchange 41 instructs the home memory 40 to increment the number of times of connection for the information of the mobile station that has been successfully authenticated.

In this embodiment, the mobile station learns the frequency of use of each number element, and determines the number element to be included in the outgoing signal according to the result. Accordingly, for example, when there is almost no other mobile station having the same individual number 52 as the own station in the reception area, the incoming call to the mobile station is transferred to only the individual number 52 according to the third embodiment. Since the station identification number is mainly used, the mobile station identification number of only the individual number 52 is used when making a call according to the present embodiment. Since the exchange 41 receiving the transmission signal has almost no mobile stations other than the mobile station having the same individual number 52 as the transmission mobile station, the number of connections of the transmission mobile station stored in the home memory 40 is: It should be more than the other mobile stations, and start authentication from the originating mobile station. Therefore, in this embodiment, the exchange 4
1 can make an outgoing connection without performing unnecessary authentication operations. If there are many opportunities for another mobile station having the same individual number 52 as the own station in the called area, the mobile station identification number including all number elements is mainly used according to the third embodiment. Therefore, the mobile station identification number including all the number elements is also used when making a call according to the present embodiment. Therefore, the exchange 41 receiving the transmission signal does not erroneously perform the authentication operation.

As described above, in this embodiment, the mobile station itself can use the validity of the third embodiment when transmitting a call without checking other mobile stations. The possibility of performing an authentication operation can be reduced.

FIG. 16 is a flowchart showing the operation of the mobile station in the mobile communication system at the time of calling according to the fifth embodiment of the present invention. FIG. 17 is a flow chart showing the operation of the mobile communication system according to the fifth embodiment of the present invention at the time of calling. FIG. 18 is a flow chart showing the operation at the time of transmission from the home memory of the mobile communication system according to the fifth embodiment of the present invention.

The outgoing connection control operation will be described with reference to FIGS. 1 to 3, FIGS. 16 to 18, FIGS. 22 and 23.

In this embodiment, the mobile station always forms a transmission signal using the mobile station identification number having only the individual number.
Is a method in which the number of times of connection within a predetermined period up to the present is registered in the home memory for each mobile station each time connection is successful, and outgoing connection is performed using the registered contents. The details are described below.

The control circuit 11 of the switching center 41 stores, in the home memory 40 for each mobile station, the number of times of successful call connection within a predetermined service period (for example, 30 days) within the service area under its control. I have registered.

When the control circuit 31 of the mobile station 43 receives the destination subscriber number and the transmission command from the user, it causes the mobile station identification number construction circuit 30 to construct a mobile station identification number consisting of only an individual number, The signal is sent to a circuit 34 to form an outgoing signal. The signal construction circuit 34 constructs an outgoing signal including the mobile station identification number and sends it to the exchange 41 via the base station 42. The control circuit 11 extracts the mobile station identification number and the called subscriber number from the input signal 14 of the input circuit 14 of the exchange 41.
Send to The control circuit 11 sends the mobile station identification number to the home memory 40. The control circuit 21 of the home memory 40 searches for information on a plurality of mobile stations having the same individual number 52 of the received mobile station identification number. The control circuit 21 sends information on the plurality of mobile stations to the exchange 41. Exchange 41
The control circuit 11 checks the number of connections of each mobile station in a predetermined period for each mobile station from the received information, determines the mobile station with the largest number of connections, and estimates that the mobile station is the originating mobile station. I do.

The control circuit 11 performs authentication using the encryption key of the estimated mobile station in the information received from the home memory 40 in the same manner as in the conventional system. If authentication is successful,
It is determined that the estimated mobile station is the originating mobile station, and the call is connected to the network of the originating mobile station and the destination subscriber number. Further, it instructs the home memory 40 to increment the information on the estimated number of times of connection of the mobile station. If the authentication fails, the control circuit 11 determines the mobile station with the second largest number of connections from the information received from the home memory 40,
It presumes that the mobile station is the originating mobile station and performs authentication.
Thereafter, until the authentication is successful, authentication is sequentially performed for mobile stations with a large number of connections, and when the authentication is successful, a call is connected. If no mobile station is successfully authenticated, the connection is terminated.

As described above, in the present embodiment, the exchange 41 constantly learns the number of connections and estimates the most probable mobile station as the originating mobile station. An outgoing signal using the station identification number can be used.

Further, this embodiment can be similarly realized by always using the mobile station identification number composed of the communication carrier number 51 and the individual number 52 for the outgoing signal. However,
When the control circuit 21 of the home memory 40 searches for the mobile station identification number in the transmission signal, the communication carrier number 51
And the individual number 52 need to search for the same mobile station.

FIG. 19 is a flow chart showing the operation of the mobile station in the mobile communication system at the time of calling according to the sixth embodiment of the present invention. FIG. 20 is a flow chart showing the operation of the mobile communication system according to the fifth embodiment of the present invention at the time of calling. FIG. 21 is a flow chart showing the operation at the time of transmission from the home memory of the mobile communication system according to the fifth embodiment of the present invention.

The transmission control operation will be described with reference to FIGS. 1 to 3, FIGS. 19 to 21, FIGS. 22 and 23.

In this embodiment, the mobile station stores the number of connections within a predetermined period up to the present for each service area. This is a method of determining a number element to be included in a mobile station identification number.

In FIGS. 1 to 3 and FIGS. 19 to 21, the mobile station identifies the service area in which the mobile station is located, based on the information broadcast from the exchange 41 as described in the first embodiment. At the same time, the mobile station counts the number of times of connection for a predetermined period (for example, 30 days) up to the present for each service area, and stores it in the memory 32. Also,
In the home area 40 as well, a predetermined period up to the present (for example, 30
(Days) for each mobile station.

When the control circuit 31 of the mobile station receives the destination subscriber number and the transmission command from the user, it accesses the memory 32, extracts the number of times of connection to the service area in the area, and sends it to the mobile station identification number construction circuit 30. . The mobile station identification number configuration circuit 30 configures a mobile station identification number having only the individual number 52 when the number of times of connection is x (for example, 60) or more. If the number of times of connection is y (for example, 30) or more and less than x, the mobile station identification number is constituted only by the individual number 52 and the carrier number 51. If the number of connections is less than y, a mobile station identification number including all number elements is configured.
The mobile station identification number configuration circuit 30 sends the configured mobile station identification number to the control circuit 31. The control circuit 31 sends the received mobile station identification number and destination subscriber number to the signal configuration circuit 34 to configure a transmission signal.

The signal construction circuit 34 sends out the constructed transmission signal to the exchange 41 via the base station 42. The input circuit 14 of the exchange 41 extracts the mobile station identification number and the called subscriber number from the received outgoing signal and sends them to the control circuit 11. The control circuit 11 sends the mobile station identification number to the home memory 40. The control circuit 21 of the home memory 40 searches for information on the mobile station in which all the number elements in the received mobile station identification number are the same, and transmits the information to the exchange 41. Here, when the originating mobile station includes all the information in the mobile station identification number in the originating signal, only the information of the only mobile station is sent to the exchange 41 as a matter of course. The control circuit 11 performs authentication using the encryption key in the information,
If the authentication succeeds, the call is connected to the network of the destination subscriber number, and if the authentication fails, the connection is terminated. If the mobile station identification number in the transmission signal does not include all the number elements (only the individual number 52 or only the communication carrier 51 and the individual number 52), a plurality of mobile stations are searched. The information is sent to the exchange 41. If the mobile station identification number is only the individual number 52, the control circuit 11 of the exchange 41 checks the number of times of connection in the information of each mobile station, and determines the number of times of connection for the mobile station whose number of times of connection is x or more. Authentication is performed sequentially from the mobile station with the largest number of times,
Connect to a mobile station that has been successfully authenticated. If the mobile station identification number is composed of the carrier number 51 and the individual number 52, the control circuit 11 of the exchange 41 checks the number of times of connection in the information of each mobile station, and determines that the number of times of connection is y. For mobile stations that are not less than x times and less than x times, authentication is performed in order from the mobile station with the largest number of connections, and connection is made with the mobile station that has been successfully authenticated. When the authentication is successful, the control circuit 11 of the exchange 41 instructs the home memory 40 to increment the connection count information of the mobile station that has been successfully authenticated.

As described above, in the present embodiment, the possibility of performing an incorrect authentication operation by using a short mobile station identification number without checking the mobile station itself can be reduced. Also,
This is very effective because a mobile station with a larger number of connections can use a shorter mobile station identification number.

In the Japanese digital car telephone system, the number of digits of each number element of the mobile station identification number is three digits in decimal notation for the country code, three digits for the communication carrier number, and five digits for the individual number.
Digits are assigned. The mobile station identification number including all number elements is 11 digits in decimal notation, and requires up to 37 bits in binary notation. On the other hand, a mobile station identification number having only an individual number needs only a maximum of 17 bits. At the time of signal transmission, since the mobile station identification number is transmitted as a binary expression, all incoming calls are notified by the individual number 5 according to the present invention.
When the mobile station identification number is used only for the mobile station identification number 2, the length of the mobile station identification number is less than half of the conventional one and the frequency channel used for paging can be reduced to less than half. Can be increased. Also, in a wireless section having a bit error rate of 10 ^-2 , the probability that the mobile station identification number in the outgoing / incoming signal is transmitted correctly is 0.69 when the mobile station identification number includes all the number elements. On the other hand, when the mobile station identification number of only the individual number 52 is used, the value is 0.84. As a result, even in terms of transmission reliability,
The present invention is very effective.

The present invention is also effective when changing the location registration of the home memory.

Further, with respect to the mobile station device in the present invention, it can be traded as a product individually in the market as an object of the present invention, and a user can use it by connecting to a mobile communication network.

[0083]

As described above, according to the present invention, a short mobile station identification number with some number elements omitted can be used, the number of control channel signals required for transmission and reception can be reduced, and the frequency utilization efficiency can be reduced. And there is an excellent effect that radio waves can be effectively used and transmission reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a mobile communication system switching center according to the present invention.

FIG. 2 is a block diagram showing an example of a mobile communication type home memory according to the present invention.

FIG. 3 is a block diagram showing an example of a mobile station of the mobile communication system according to the present invention.

FIG. 4 is a flowchart showing the operation of the mobile communication system according to the first embodiment of the present invention at the time of an incoming call;

FIG. 5 is a flowchart showing the operation of the mobile communication system according to the first embodiment of the present invention when an incoming call is received from the home memory;

FIG. 6 is a flowchart showing the operation of the mobile station in the mobile communication system at the time of incoming call according to the first embodiment of the present invention.

FIG. 7 is a flowchart showing an operation of the mobile station in the mobile communication system at the time of calling according to the second embodiment of the present invention.

FIG. 8 is a flowchart showing an operation at the time of calling by the mobile switching center according to the second embodiment of the present invention;

FIG. 9 is a flowchart showing the operation of the mobile communication system according to the second embodiment of the present invention when originating a home message.

FIG. 10 is a flowchart showing an operation at the time of termination of an exchange in the mobile communication system according to the third embodiment of the present invention.

FIG. 11 is a flowchart showing the operation of the third embodiment of the present invention at the time of an incoming call to the home memory of the mobile communication system.

FIG. 12 is a flowchart showing an operation of a mobile station in a mobile communication system according to a third embodiment of the present invention when a call is received.

FIG. 13 is a flowchart showing an operation of the mobile station in the mobile communication system according to the fourth embodiment of the present invention at the time of transmission.

FIG. 14 is a flowchart showing an operation at the time of calling by a switching center in the mobile communication system according to the fourth embodiment of the present invention.

FIG. 15 is a flowchart showing an operation at the time of originating a home message in the mobile communication system according to the fourth embodiment of the present invention.

FIG. 16 is a flowchart showing an operation of the mobile station in the mobile communication system according to the fifth embodiment of the present invention at the time of transmission.

FIG. 17 is a flowchart showing an operation at the time of calling by a switching center in a mobile communication system according to a fifth embodiment of the present invention;

FIG. 18 is a flowchart showing an operation at the time of transmission of a home memory in the mobile communication system according to the fifth embodiment of the present invention.

FIG. 19 is a flowchart showing an operation at the time of transmission of a mobile station in a mobile communication system according to a sixth embodiment of the present invention.

FIG. 20 is a flowchart showing an operation at the time of calling by a switching center in the mobile communication system according to the sixth embodiment of the present invention.

FIG. 21 is a flowchart showing an operation at the time of transmission of a home memory in the mobile communication system according to the sixth embodiment of the present invention.

FIG. 22 is a block diagram of a mobile communication system.

FIG. 23 is a configuration diagram of a mobile station identification number in a mobile communication system.

[Explanation of symbols]

 Reference Signs List 10 mobile station identification number analysis circuit 11, 21, 31 control circuit 12, 30 mobile station identification number configuration circuit 13, 23 output circuit 14, 24 input circuit 22, 32 memory 33 mobile station identification number comparison circuit 34 signal configuration circuit 35 transmission Circuit 36 Receiving circuit 37 Signal decomposing circuit 38 Transmission / reception distribution circuit 39 Antenna 40 Home memory 41 Switching station 42 Base station 43 Mobile station 50 Country code 51 Telecommunication carrier number 52 Individual number

──────────────────────────────────────────────────続 き Continuing the front page (72) Inventor Jun Tajima 2-1-1 Toranomon, Minato-ku, Tokyo NTT Mobile Communications Network Co., Ltd. (58) Fields surveyed (Int. Cl. ⁷ , (DB name) H04B 7/24-7/26 102 H04Q 7/00-7/38

Claims (4)

(57) [Claims] 1. A mobile communication system comprising: a plurality of mobile stations; and a switching network for communicating with the plurality of mobile stations, wherein the plurality of mobile stations include mobile station control means for performing outgoing / incoming connection control. A home memory for storing mobile station identification numbers and mobile station information of the plurality of mobile stations; and network control means for performing outgoing / incoming connection control, wherein the mobile station identification number is a nationality to which the mobile station belongs. In the mobile communication system consisting of a country code indicating a mobile station, a communication carrier number for identifying a communication carrier to which the mobile station belongs, and an individual number for identifying a mobile station to which the mobile station belongs. The network control means includes network connection control means for transmitting to a mobile station to be a communication partner while omitting a partial number element of a mobile station identification number; and the mobile station control means includes a partial number element. Is omitted from the received mobile station identification number. Mobile communication method comprising the comparison determines the mobile station comparing means and the mobile station identification number. 2. A mobile communication system comprising: a plurality of mobile stations; and a switching network that communicates with the plurality of mobile stations, wherein the plurality of mobile stations include mobile station control means that performs outgoing / incoming connection control. A home memory for storing mobile station identification numbers and mobile station information of the plurality of mobile stations; and network control means for performing outgoing / incoming connection control, wherein the mobile station identification number is a nationality to which the mobile station belongs. In the mobile communication system consisting of a country code indicating a mobile station, a communication carrier number for identifying a communication carrier to which the mobile station belongs, and an individual number for identifying a mobile station to which the mobile station belongs. The mobile station control means includes a mobile station connection control means for transmitting to the switching network while omitting a partial number element of a mobile station identification number. The network control means has a partial number element. The mobile station identification number received Mobile communication system, characterized in that a comparator determining network comparison means and the mobile station identification number of the mobile station. 3. The mobile communication system according to claim 1, wherein said network connection control means or said mobile station connection control means is also effective when changing the location registration of said home memory. 4. A mobile station control means for performing outgoing / incoming connection control on a switching network using a mobile station identification number, wherein the mobile station identification number is a country code indicating a nationality to which the mobile station belongs. And a communication carrier number for identifying a communication carrier to which the mobile station belongs, and an individual number for identifying a mobile station to which the mobile station belongs. The mobile station control means includes: a mobile station connection control means for transmitting to the switching network by omitting a partial number element of a mobile station identification number; and a mobile station having a partial number element omitted and received. A mobile station apparatus comprising a mobile station comparing means for comparing an identification number with a mobile station identification number.