JP3037322B1 - Digital mobile communication system, mobile terminal thereof, and location registration method - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To provide a digital mobile communication system, a mobile terminal thereof, and a location registration method, which periodically register a location with a base station so as to increase a connection rate of a telephone line. It is intended for. A digital mobile communication system capable of communicating in a public mode service area and a private mode service area, wherein a mobile terminal receives a position information signal from a base station and transmits a position registration signal to the base station. A system that performs location registration, periodically transmits a location registration signal from the mobile terminal that has performed location registration, and the base station performs location registration or data update, and performs a call,
Since the mobile terminal periodically transmits a location registration signal to the base station, even if the system side goes down and the mobile terminal is in the same zone as the location-registered zone, the system side returns. At this time, the location registration processing is performed for the base station, so that the line connection can be ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital mobile communication system capable of communicating in a private mode service area such as a public mode service area, a home, and a business.
In particular, the communication system (PHS: Personal H)
The present invention relates to a location registration method of an andyphoen system and a telephone terminal (simple portable telephone, mobile terminal) such as a digital cordless which is a PHS slave.

[0002]

2. Description of the Related Art In recent years, as a digital mobile communication system, a system using a satellite, a mobile telephone having a wide service zone, and a large number of stations covering a relatively small area have been provided. There is a system (PHS) that realizes this. In addition, a location information service using the PHS is being implemented.

[0003] The PHS has a function of enabling its mobile terminal (telephone terminal) to monitor radio waves from other base stations and mobile terminals in addition to transmitting and receiving to and from its own terminal. The mobile terminal has a feature of having a cell selection function for maintaining the best reception level and capable of performing communication control enabling mobile-assisted handover.

[0004] A mobile terminal in the PHS receives a position information signal transmitted at predetermined intervals from a base station, performs a base station search, and differs from the position information (ID) stored in the mobile terminal. In this case, the user transmits his / her identification information (position registration signal) to the base station, registers his / her own position information (identification number, telephone number) on the base station side, and then performs a call or communication.

[0005] In this location registration, as shown in FIG.
There are two types of modes, that is, when the power is turned on and when a wireless error occurs. In step S1, these conditions are selected. Also, in step S1, when the mobile terminal is powered on, it receives a position information signal transmitted by the base station, searches for a nearest base station suitable for standby from its reception level, and identifies the ID of the most suitable base station. Is taken into the mobile terminal, and it is determined whether or not the ID matches the ID of the base station whose position has been last registered by the control unit (step S2). If the ID of the base station matches the stored ID, the process proceeds to step S4 without performing position registration, executes a standby process, and executes step S4.
5 is set as a standby state. On the other hand, if the IDs do not match, the process proceeds to step S3, where a location registration process is executed to perform location registration. That is, when the mobile terminal is in the same area as the area for which the location has been registered, the location registration is performed only once, and the location registration is not performed unless the mobile terminal exceeds the area (paging area).

[0006] When a radio error occurs during a call,
Proceed to step S6. Since handovers between zones (moving between paging areas) are prohibited, if a mobile terminal moves between paging areas and a call is made, the base station will move away and the call quality will drop, and the call will be lost. Be cut off. In that case, from step S6 to step S
Proceeding to 7, the location registration was performed. Further, when a radio abnormality occurs during standby, when synchronization with the base station that has been waiting has been lost, a base station search process is performed, and the IDs of the base station that is waiting and the base station that is trying to wait are determined. If they are different, location registration processing has been performed. By the way, the handover is to control the connection with the mobile terminal to the nearest base station at the exchange to maintain the communication quality when moving between zones.

[0007] In addition, when a radio abnormality occurs when the mobile terminal is in a standby state and synchronization with the base station that has been waiting is lost, the mobile terminal performs a base station search process and performs base station search processing. And the ID of the base station that has been waiting and the ID of the base station that is waiting to be received.
When D is different, location registration processing has been performed.

[0008]

As described above, as described above,
In the PHS, when the ID of the base station does not match the ID of the base station stored in the mobile terminal when the power is turned off, the location registration processing is performed. In other words, even if the system side goes down after the mobile terminal performs location registration and the system returns after that, if the mobile terminal is in the same area, the base station ID stored in the mobile terminal is stored. Therefore, no new location registration is performed.
As a result, there is a drawback that the mobile terminal does not receive a call via the base station storing the ID even when the power of the mobile terminal is on.

[0009] In the PHS, handover is prohibited when a radio error occurs during a call, and when moving between zones, the base station that relayed the call moves away and the call quality deteriorates. Was. Further, when the mobile terminal makes a call away from the registered base station, the communication line is disconnected. Then, since the location registration was performed with the nearest base station only after the call line was cut off, the line connection rate sometimes deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a digital mobile communication system in which location registration is periodically performed with respect to a base station to increase the connection rate of a telephone line. , A mobile terminal, and a location registration method.

[0011]

In order to solve the above-mentioned problems, a first aspect of the present invention is a digital mobile communication system capable of communicating in a public mode service area and a private mode service area. And transmits a location registration signal to the base station to perform location registration, and periodically transmits a location registration signal from the mobile terminal that has performed location registration to allow the base station to perform location registration. It is characterized by registering or updating data and talking.

According to the present invention, the mobile terminal periodically transmits a location registration signal to the base station to register or update the data of the mobile terminal. Even when the mobile terminal is in the same zone as the location-registered zone, when the system returns, it sends a location registration signal to the base station to perform location registration and connect. Can be ensured. Moreover, even within the same zone, the base station can be periodically searched to switch to the base station with the best reception level.

According to a second aspect of the present invention, in a location registration system in a digital mobile communication system capable of communicating in a public mode service area and a private mode service area, a mobile terminal receives a location information signal from a base station. Transmitting a location registration signal to the base station, and after location registration, the mobile terminal periodically transmits a location registration signal,
The location registration or data update of the mobile terminal is performed at the base station.

According to the present invention, in the digital mobile communication system, the mobile terminal periodically transmits a location registration signal, so that the system side goes down and the mobile terminal registers the location. Even in the case of being in the same zone as the zone, when the system returns, by transmitting a location registration signal and performing location registration, connection can be ensured. Moreover, even within the same zone, the base station can be periodically searched to switch to the base station with the best reception level.

[0015] Further, the invention of claim 3 is characterized in that, when the location registration is not normally performed in the base station, the timing of the location registration signal periodically transmitted from the mobile terminal is shortened.

According to the present invention, by shortening the timing at which the location registration signal is periodically transmitted, when the base station returns, it is possible to quickly return to a communicable state.

According to a fourth aspect of the present invention, there is provided a mobile terminal in a digital mobile communication system capable of communicating in a public mode service area and a private mode service area. Receiving the location registration acceptance signal from the base station and storing the ID of the base station, and periodically transmitting the location registration signal at a predetermined timing even after storing the ID of the base station.

According to the present invention, the mobile terminal has the CPU
The control unit is configured to have a control program configured to set a timer to periodically transmit the position registration signal, and to periodically transmit the position registration signal to the base station. it can.

According to a fifth aspect of the present invention, when the location registration is not normally performed, the mobile terminal periodically controls the transmission so as to shorten the timing of transmitting the location registration signal. Features.

According to the present invention, the control unit of the mobile terminal sets a control program so as to shorten the timing of periodically transmitting the position registration signal when the position registration is abnormal, so that when the base station returns. In addition, it is possible to quickly return to a communicable state.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram schematically showing a digital mobile communication system according to the present invention.
FIG. 2 is a circuit block diagram of the mobile terminal of the present invention. FIG.
FIG. 3 is a diagram for explaining a protocol of a mobile terminal according to the present invention. FIG. 4 is a diagram showing a processing flow for explaining the position registration method of the present invention. FIG. 5 is a diagram showing a flow of the terminal signal reception processing of the head office.

First, an outline of a digital mobile communication system according to the present invention will be described with reference to FIG. The figure shows that the digital mobile communication system can be interconnected with these networks, i.e. from the mobile communication network 2 to the fixed communication network 1 which is a subscriber telephone network, The private telephone exchange network 3 and the home cordless telephone 4 can connect to the fixed communication network 1. Of course, connection between the mobile terminals 5 is possible, and communication is possible with the common mobile terminal 5 in these communication networks.

The mobile communication network 2 is provided with a large number of integrated base stations 7 including a base station 6 and an exchange, and is connected to the private telephone exchange network 3 and the home cordless telephone 4 via the fixed communication network 1. it can. The mobile terminal 5 is connected to each base station 6,
7 and the master station 9 via a wireless (air) interface. In the private branch exchange network 3, the signal is received by the base station 7,
It is connected to the fixed communication network 1 via the private branch exchange 8. The mobile terminal 5 can be connected to both the base station 7 of the private telephone exchange network 3 and the base station 6 of the mobile communication network 2.

Next, an outline of a circuit block diagram of the mobile terminal 5 (digital cordless telephone terminal) will be described with reference to FIG. The mobile terminal 5 includes a transmitting / receiving antenna 10,
A radio unit 11, a voice conversion circuit unit 12, a speaker 13, a microphone 14, a control unit 15 including a CPU, a data memory unit 16 for storing telephone numbers and the like, a key input unit 17,
A program memory unit 18, a work memory unit 19 for temporarily storing processing data, a display unit 2 for displaying telephone numbers and the like
0 and so on.

The radio unit 11 includes a frequency conversion unit, a modem unit,
The transmission / reception antenna 10 is configured to convert the frequency of a signal received by the transmission / reception antenna 10 and output the converted signal to the modem unit.

The voice conversion circuit section 12 includes a microphone 14
The digital audio data is encoded into digital audio data, or the digital audio data is decoded and output from the speaker 13.

The control unit 15 is a control unit for controlling the terminal. For example, the control unit 15 performs processing in response to a key input from the key input unit 17 or performs processing based on a communication control program stored in the program memory unit 18. To execute a communication control sequence as a mobile terminal. That is, the control unit 15 executes a communication control sequence based on a wireless communication protocol with the base station, executes communication control processing according to a communication control processing program, and executes the key input unit 1.
The telephone number input from 7 is displayed on the display unit 20,
Alternatively, various processing such as driving of a ringer for notifying that there is an incoming call is performed.

Next, the protocol of the mobile terminal 5 of the present embodiment will be described. The mobile terminal 5 is connected to the base stations 6 and 7
And a function connectable to the base unit 9 and a function of automatically informing the base station waiting at the mobile terminal 5 where the terminal is currently located. In these functions, communication between a mobile terminal and a base station is defined by a protocol, and the SIO (Open Systems) is used.
Seven layers (layers 1 to 7) of an interconnection model are applied. Wireless section signaling
The information transfer path is set in the wireless section by a series of line connection control means for the functions up to layer 1, layer 2, and layer 3. In layers 4 to 7, communication control between terminals and the like are defined.

FIG. 3 is a diagram for explaining the function of each layer of the mobile terminal according to the present embodiment. The program memory 18 is provided with a storage area in which a program for air message management is stored as one of the control programs of the line connection control means. As shown in FIG. 3, an air management management unit 18a and layers 1 to 3 (18b to 18d) are written in the program memory unit 18.

The layer 1 section 18b is an area for providing functions such as a used frequency, a transmission output, a modulation / demodulation method and an access method, synchronization establishment control, transmission power control, and interference countermeasure control. The layer 2 section 18c is an area for providing a function of specifying a mobile terminal with which the base station wants to communicate and enabling correct transmission and reception of information with the mobile terminal. The layer 3 section 18d is an area for providing functions such as call connection during outgoing / incoming calls, line monitoring, location registration, connection change during movement between cells (zones), and call termination processing. These pieces of control information are read out based on the line connection control means and transmitted in a predetermined format.

In this embodiment, the regular location registration is performed by the control unit 15, the air management unit 18a, the layer 1 unit 18
b, the layer 2 unit 18c and the layer 3 unit 18d. The control unit 15 notifies the air management unit 18a of a request for periodical position registration when a predetermined time is counted from a position registration at power-on or a position registration at handover by a timer. The air management unit 18a that has received the periodic position registration request instructs the layer 1 unit to perform the periodic position registration. Layer 1 part 18
b performs a process of setting up a call, instructs the layer 2 unit 18c to synchronize when a call can be connected, and instructs the layer 3 unit to perform location registration when synchronization is achieved. When the position registration is successful, the layer 3 unit 18d notifies the control unit 15 that the position registration has been completed.

When the position registration is completed normally, the control unit 15 instructs to start the timer again, performs the same control, and periodically performs the position registration. In addition, if the location registration is not completed normally, the time interval of the periodically performed location registration is started by setting a shorter time to a timer, and the location registration is retried frequently. To control.

Next, the location registration condition processing of the present invention will be described with reference to the processing flow in FIG. In the position registration method of the present invention, first, in step S1, a position registration condition is determined. At power-on (including initial power-on)
Proceeds to step S2, performs a base station search (a process of searching for a base station having a certain reception level or higher), selects a base station that satisfies the conditions for standby, and registers the base station ID and finally the location registration. If the ID of the performed base station (when the power is off) does not match, the process proceeds to step S3 to perform location registration. Also, in the case of a wireless abnormality during a call, handover between zones (movement between simultaneous call areas) is prohibited, and when attempting to perform the operation, the base station used for the call moves away, resulting in call quality. Drops and the call is disconnected. In such a case, location registration is performed. In the case of a radio abnormality during standby, a base station search process is performed when synchronization with the base station that has been waiting is lost, and location registration is performed when the ID of the base station that is waiting is different from the ID of the base station that is waiting. Is going. However, in the location registration method of the present invention, since the periodic location registration is performed, the best base station is searched in advance and the location registration is performed. The number of occurrences is suppressed.

Further, in the location registration method of the present invention, in step S1, the mobile terminal performs location registration, and at the same time, proceeds to step S8, sets a timer to start timekeeping, and measures a predetermined time. Proceeding to S9, the location registration process can be executed even if the area is the same. In other words, it is possible to switch to the best base station before the call quality deteriorates. Then, at the same time as the mobile terminal performs the location registration, the process again proceeds to step S8, where a timer is set to start time measurement, and the same operation is repeated.

In the present embodiment, when the mobile terminal is in the power-on state, a timer is set by the control program regardless of the number of location registrations and even if the mobile terminal is in the same area. The registration processing is performed to execute the periodic location registration.
If the location registration is not successful, a timer is set to measure a shorter time than in the case of the regular location registration, and the time is controlled to perform a retry process of the location registration.

On the other hand, when the base station receives the identification signal (position registration signal such as ID and telephone number) from the mobile terminal,
The terminal signal reception processing shown in FIG. 5 is executed. When the processing shown in FIG. 5 is executed, the identification number (ID) of the mobile terminal
And a process of acquiring the telephone number assigned to the mobile terminal (step S1). Next, the main station (general base station) managing the base station is requested to register the area code managed by itself, the ID of the received mobile terminal, and its telephone number (step S2). In addition,
When the mobile terminal moves within the area managed by the same main station, the location registration data is updated in step S2. When the location registration is completed, the main station (general base station) transmits a location registration acceptance signal to the mobile terminal via the base station. The mobile terminal receives the location registration reception signal and receives the ID of the base station.
Is stored.

[0037]

As described above, according to the present invention, it is not known on the mobile terminal side that the system side has gone down by executing the periodic location registration, but the location registration processing is periodically performed. Therefore, even in such a case, it is possible to eliminate an inconvenient state in which a call is not received even though the power is on, and a line can be securely connected. There are advantages that can be increased.

Further, according to the present invention, since the location registration signal is periodically transmitted to the base station, the currently implemented P
It is possible to provide a digital mobile communication system that is extremely effective for a location information service using HS, and a mobile terminal thereof.

Further, according to the present invention, when a location registration error occurs, a timer for setting a timing at which a location registration signal is transmitted is set to a short time.
Since the location registration signal can be transmitted accurately in a short cycle, there is an advantage that a communication path can be secured. In addition, in the location information service using the PHS, the location registration is not performed unless the timer is out when returning from the other zone to the zone where the location registration is performed. Therefore, the location registration signal is transmitted at such a short timing. Accordingly, there is an advantage that the position of the mobile terminal can be quickly notified.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a digital mobile communication system according to the present invention.

FIG. 2 is a circuit block diagram of a mobile terminal according to the present invention.

FIG. 3 is a diagram illustrating a protocol of a mobile terminal according to the present invention.

FIG. 4 is a diagram showing a processing flow for explaining a position registration method of the present invention.

FIG. 5 is a diagram showing a flow of a terminal signal reception process of the main station.

FIG. 6 is a diagram showing a processing flow for explaining a conventional location registration method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed communication network 2 Mobile communication network 3 Private telephone exchange network 4 Home cordless telephone 5 Mobile terminal 6 Base station 7 Base station 8 Private telephone exchange 9 Master station 10 Transmission / reception antenna 11 Radio unit 12 Voice conversion circuit unit 13 Speaker 14 Microphone 15 Control unit 16 Data memory unit 17 Key input unit 18 Program memory unit 18a Air management unit 18b Layer 1 unit 18c Layer 2 unit 18d Layer 3 unit 19 Work memory unit 20 Display unit

Claims (5)

(57) [Claims] In a digital mobile communication system capable of communicating in a public mode service area and a private mode service area, a mobile terminal receives a position information signal from a base station and transmits a position registration signal to the base station. Digital mobile communication, characterized in that a location registration signal is periodically transmitted from the mobile terminal that has performed location registration, and the base station side performs location registration or data update and transmits information. system. 2. A location registration system in a digital mobile communication system capable of communicating in a public mode service area and a private mode service area, wherein a mobile terminal receives a location information signal from a base station and registers the location with the base station. After sending the signal and registering the location,
A location registration method, wherein the mobile terminal periodically transmits a location registration signal, and the location registration or data update of the mobile terminal is performed on the base station side. 3. The mobile station according to claim 2, wherein, when the location registration is not normally performed in the base station, the timing of the location registration signal periodically transmitted from the mobile terminal is shorter than in a normal case. Location registration method described. 4. A mobile terminal in a digital mobile communication system capable of communicating in a public mode service area and a private mode service area, wherein the mobile terminal transmits a position registration signal and receives a position registration acceptance signal from a base station. A mobile terminal that receives and stores an ID of a base station, and periodically transmits a location registration signal at a predetermined timing after storing the ID of the base station. 5. When the location registration is not performed normally,
The mobile terminal according to claim 4, wherein control is performed such that the timing at which the mobile terminal periodically transmits the position registration signal is shorter than that in a normal case.