JPH08317471A - Access control method for mobile station and mobile object communication system using the same - Google Patents

Abstract

PURPOSE: To control the generation of the random access of a mobile station when a disaster occurs, to suppress confusion by the collision of burst and to simultaneously gave the call origination of emergency communication preferentially. CONSTITUTION: Base stations 4, 5 and 6 transmit a communication control message for selectively inhibiting the call origination through a reporting channel to the mobile stations 7 and 7'. Number information for specifying the mobile station of a control object and the control end time are included in the communication control message. The mobile stations 7 and 7' receive the communication control message when a power source is turned on, and when the communication control time of its own station is detected, inhibit the call origination and shift to a control standby mode without performing 'position registration'.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system such as a mobile phone, and more particularly to a mobile station access control system which is effective when a disaster occurs in a service area.

[0002]

2. Description of the Related Art A mobile communication system connects a mobile station such as a mobile phone owned by a system subscriber to a telephone of a public network through a base station installed in a service area.
For example, "Digital Car Phone Standard RCR STD-2" issued by the Foundation, Radio System Development Center
7 ”.

In this system, a wireless link between a base station and a mobile station transmits voice and other information in the form of digital data.

For access, the downlink (from the base station to the mobile station) is TDM (Time Division Multiple), and the uplink (from the mobile station to the base station) is TDMA (Time Divisi).
onMultiple Access) method is adopted. One frame is 20 ms, which is divided in time and shared by a plurality of mobile stations. The divided unit is called a slot, the multiplexing number is 3, and the uplink transmission from the mobile station becomes a burst signal. The upstream and downstream transmission timings need to be synchronized at fixed offset time intervals. Each mobile station secures an access right with the base station via a common access channel. The first burst transmission is random access of each mobile station, and the mobile station correctly received by the base station has priority,
The next slot can be transmitted. This priority information is broadcast on the downlink from the base station. The standard uses a method called partial-echo-equipped skyline control random access, which will be described with reference to FIG.

FIG. 6 illustrates the relationship between the TDM frame transmitted from the base station and the random access operation of the mobile station. Code 6 appearing with symbol E in TDM frame
01, 602 indicates a collision control bit, and 61, 6
2 indicates a mobile station which starts access.

The collision control bits include a bit string (I / B) that permits transmission in the next frame, a bit string (R / N) indicating whether a signal is received, and a partial echo (P).
E).

The mobile stations 61 and 62 can transmit the first slot only when the collision control bit 601 of the downlink frame is received and the transmission permission I of the next slot is detected.

When the base station receives this slot, it transmits back a bit string indicating non-transmission B and signal reception R on the collision control bit and the result of performing a certain process on the received data as a partial echo. The mobile station can determine that its slot is received by the base station by analyzing this partial echo. In FIG. 6, it is assumed that the partial echo regarding the transmission data of the mobile station 62 is returned (B, I, 2). Of the two mobile stations that have received the collision control bit 602, the mobile station 61 stops transmitting the next slot, and the mobile station 62 operates so as to continuously transmit the next slot. In this way, only the mobile station 62 that is first received by the base station continues communication, and transmission of other mobile stations is prohibited, thereby avoiding subsequent signal collision. The mobile station 61, which has failed in the first access, starts random access again after a predetermined random time has elapsed.

[0009]

From the above, the success rate of random access largely depends on the total number of mobile stations requesting the access right at one time and the total number of empty channels of the base station. When the random access is successful and the "location registration" is completed for the network, the mobile station transits to the "standby reception" state and informs the user that the service is "in range" and reception level information. It is necessary to output to display means such as a display.

When access of a very large number of mobile stations concentrates on a specific base station for a period of time, it becomes difficult for many mobile stations to transit to "standby reception" promptly.

In particular, when a disaster occurs, an urgently required urgent request, a simple inquiry about safety, etc. are disturbed and communication is congested, so that a very large capacity line is required. If the subscriber capacity of the service zone is not sufficient, the increase in random access failure rate will be a factor of increasing user anxiety and confusion.

In addition, when a large earthquake or the like occurs, a wired line may be damaged, and a mobile communication system using a wireless line has disaster durability, but if a call that cannot be processed occurs. You cannot take advantage of disaster durability.

Therefore, there has been proposed a system in which a movable base station is provided in the system and the mobile station is dispatched to a specific service zone when a disaster occurs to reduce the processing load. (For example, it is described in Japanese Unexamined Patent Publication No. 5-183489.) However, various transportation means may be cut off due to a disaster, and the dispatch of mobile base stations is not always performed smoothly.

An object of the present invention is to provide a mobile communication system which is designed so as not to cause confusion to users of mobile stations when access is temporarily concentrated and a line is not secured. Another object is to provide a system in which priority is given to access for emergency communication and collision with other daily communication is reduced.

[0015]

In order to achieve the above object, a mobile communication system of the present invention prohibits a mobile station from transmitting a random access channel with a group-selective and finite length time width. When the base station that notifies the communication regulation information and the communication regulation information is received and it is detected that the own station is subject to the regulation, when the individual call (incoming call) is made within the transmission prohibited time, Consists of a mobile station with a transmission prohibition function that prohibits transmission of your own station and an output function that informs the user that communication is being regulated and its cancellation, except for emergency communications that require police calls and fire and emergency calls To be done.

[0016]

The base station selects a specific group from a large number of mobile stations via the broadcast channel to prohibit transmission, and the selected mobile station uses the transmission prohibition function within the transmission prohibition time. Since no call is made except for "location registration" and emergency communication, temporal concentration of access to the base station means can be reduced. Therefore, even when communication is congested such as during a disaster, the mobile communication system can be operated without confusion.

Further, the user can detect that his mobile station is subject to communication regulation by the output function, so that "the mobile station is out of order" or "out of service" due to the communication regulation. Not misleading.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of a system configuration of the present invention. FIG.
In the figure, 1 is a general telephone connected to a fixed network, 2 is a public exchange of the fixed network, 3 is a car telephone exchange, and 4, 5 and 5.
Reference numeral 6 is a base station device, and reference numerals 7 and 7 ′ are mobile stations having a clock function. Further, 8 and 9 are command centers of police and fire stations, respectively. 10 is a service zone in which the mobile stations 7 and 7'are located.

The mobile stations 7 and 7'are connected to the base station 4 by a wireless line, and hereinafter, via the car telephone exchange 3 and the public exchange 2,
Various terminals connected to a fixed network (for example, ordinary telephone 1)
Connect to.

Suppose that a disaster such as an earthquake occurs in the service zone 10 and communication regulation is required to prevent the line from being cut off by limiting the congested communication.

In this embodiment, the car telephone exchange 3 controls the incoming call from the fixed network to the mobile station, and conversely, the mobile station controls the outgoing call from the mobile station and the transmission output such as "location registration". It is carried out by the base station 4 according to a command from the station 3. The communication regulation of the mobile station will be described in detail below.

The base station 4 transmits a communication restriction message on the downlink notification channel. In the present embodiment, the content of the communication restriction message is composed of number information designating a group whose transmission is prohibited and the restriction end time.

The number information may be, for example, one digit at the end of the telephone number or an odd number or even number of the last number.

Further, the regulation end time is determined by the mobile stations 7 and 7 '.
Is to detect the release of the autonomous regulation based on the clock function of each person.

When the mobile station devices 7 and 7'detect the communication restriction message on the broadcast channel, the mobile station devices 7 and 7'determine whether their own stations are restricted before random access to the base station device 4 such as "location registration". It is necessary to make calls and prohibit outgoing calls except for non-emergency communications at the control time of your own station.

In the present embodiment, if the mobile station 7'has a restriction target in the number information, the mobile station 7'is prohibited from random access as shown in FIG.

This operation will be described with reference to the flowcharts of FIG.

FIG. 2 is a flowchart of the operation when the power of the mobile station is turned on.

The powered-on mobile station starts receiving a broadcast channel called a "perch channel" and establishes a synchronization state with respect to the time division multiplex frame (20).
2). A communication restriction message is detected on this broadcast channel (203), and if a communication restriction message is received, the process proceeds to step (204). If no communication restriction message is detected, "location registration" (211) is immediately performed.

After the "location registration" is completed in step 211, a non-restriction message is displayed (D) to clearly indicate "available" to the user by displaying the reception level on the display means (not shown) of the mobile station (D). ) Is performed (212), and a transition to a non-regulation standby mode (213) is made.

On the other hand, when the communication is restricted, it is determined in step 204 whether or not the restriction time of the own station is reached. Here, if it is not at the regulation time, after performing "location registration" (209), a regulation message (C) is displayed (C) that clearly indicates to the user that the communication is regulated by the wireless line. ), And transits to the non-regulation standby mode (213).

If it is determined in step 204 that the communication restriction time is reached, transmission of the mobile station is prohibited by hardware (205). Next, the operation of the restriction timer that calculates the elapsed time until the restriction is released from the received restriction release time and the current time given from the clock function and reports to the user when this elapsed time has been counted Start (2
06).

Then, the control message (A) is displayed (20), which clearly indicates that the "location registration" has not been completed and that transmission of the own station is prohibited due to communication restriction (20).
7), transition to a state called regulation waiting mode (208).

The above is the flowchart of the operation when the power is turned on.

The characteristic feature of this embodiment is that two conventional standby modes are provided, which differ from the conventional standby reception state when the communication is restricted and when the communication is not restricted. In this different standby state, the display on the display unit is switched to the user, and communication regulation is implemented without confusion.

The two standby modes will be described below.

FIG. 3 is a flowchart of the operation of the mobile station in the regulation standby mode in this embodiment. When the mobile station shifts to the regulation standby mode (208), the processing of the following steps is performed.

The detection of an incoming call from the line side of the mobile station is performed by the paging channel PCH designated by the broadcast channel. Monitoring of this channel is always carried out during standby (301). However, since it is premised that "location registration" has already been performed for the occurrence of an incoming call, the actual occurrence of an incoming call is because "location registration" work has been performed through the steps shown below. It will be.

When an incoming call is detected in step 301, the mode changes to the incoming call mode 302, and otherwise, the process proceeds to step 303.

In step 303, it is determined whether or not the communication restriction is released on the broadcast channel. If the communication is released, the non-regulation standby mode is reached, and the process proceeds to step 312.

If it has not been canceled, it is judged whether or not it is the non-restricted time of its own station (304). This is determined by the counting result of the restriction timer described in FIG. If the regulation timer has not reached the predetermined count value, step 30
Go to 5. On the other hand, when the regulation timer detects that the regulation time of the own station has expired, the process proceeds to step 312 which reaches the non-regulation waiting mode.

At step 312, the prohibition of transmission from the mobile station is released. Next, it is judged whether the "location registration" is completed (313), and if it is not completed yet, the "location registration" is executed (314). Next, it is determined (315) whether normal "location registration" has been performed. If the mobile station is normal, the user is notified that the mobile station has become "usable" from the restricted object using the display means (316),
Then, the state transits to a non-regulation standby mode (213).

Further, when the failure of the "location registration" is detected in step 315, the transmission of the mobile station is prohibited again (31
7) Return to step 301.

Apart from the above, if it is determined in step 304 that it is at the regulation time of the own station, in step 305
It is determined whether or not there is a call request for the user's emergency communication (305). However, the above-mentioned emergency communication refers to police reports, fire fighting, and emergency reports, and is a call that can be determined as emergency communication by inputting the number of the other party in the mobile station device.

When there is a request for this emergency communication, the mobile station device is immediately prohibited from calling (306), and then it is determined whether "location registration" has already been completed (307).
If it is not finished yet, perform "location registration" (30
8) and if "location registration" has been completed, step (31)
Go to 0). After the step 308, it is judged whether or not the "position registration" is normally completed (309), and if the result is "defective", the process returns to the step 308. In the case of normal termination, the user is informed that it has become "usable" (310), and a transition is made to the calling mode (311).

If it is determined in step 305 that there is no request for emergency communication, the process returns to step 301 and the series of operations in the regulation waiting mode (208) is repeated.

As described above, in the regulation waiting mode, the transition to the calling mode is limited to the emergency communication. Also, after the "location registration" is performed by releasing the regulation of the line or detecting the non-regulation time of the own station, the mode shifts to the non-regulation standby mode.

Next, the non-regulation standby mode will be described. FIG. 4 is a flowchart of the operation of the mobile station in the non-regulation standby mode in this embodiment.

In the non-regulation standby mode, first, the calling channel is monitored in step 401 to detect an incoming call from the line. If an incoming call is detected here, the mode changes to the incoming call mode (402). If there is no incoming call, the communication restriction message is monitored on the broadcast channel (403). If a new communication restriction message is not detected, it is then determined whether there is a call request from the user (406), and if there is such a request, the call mode (407) is entered. If there is no call request, the necessity of updating "location registration" accompanying zone movement is judged (408), and if necessary, "location registration" is carried out (409). When there is no need to update and when step 409 is completed, the process returns to step 401 and the process from the beginning is repeated.

When a new communication regulation message is received in step 403, it is next determined whether or not it is at the regulation time of its own station (404). Then, when it is at the regulation time, transmission of the mobile station device is prohibited by hardware (410), and subsequently, similarly to step 206 of FIG. 2, counting of the regulation timer is started (411). Then, although the "location registration" has been completed, a restriction message is displayed 412 that clearly indicates that communication is restricted and outgoing calls from the local station are prohibited except for emergency communication, and the mode shifts to the restriction waiting mode 213. . On the other hand, in step 404, when it is detected that the regulation time is not reached, although the “location registration” has been completed, a regulation message indicating the state where the communication regulation is being performed on the wireless line is displayed to the user. (40
5) and then proceeds to step 406.

As described above, in the non-regulation standby mode, in addition to the conventional mobile communication standby operation, if a new communication regulation message is received on the broadcast channel and the local station is within the regulation time, transmission is prohibited, The regulation timer is started to count, the regulation state is displayed, and the mode is changed to the regulation waiting mode.

Here, display examples of the mobile station device in two standby modes will be shown. As described above, the types of display are (A) and (B) indicating the transition to the regulation standby mode, and (C) and (D) indicating the transition to the non-regulation standby mode.
There are types.

In summary, (A) "location registration" has not been reached, and outgoing calls from the own station are prohibited.

(B) The "location registration" has been completed, and the originating of the own station is prohibited.

(C) "Location registration" has been completed, and communication restrictions are being implemented on the wireless line. (However, it is not applicable to your own station) (D) "Location registration" completed, no communication restrictions.

There are four display states.

The display format in each state will be described with reference to FIG. FIG. 5 illustrates display means (not shown) provided in the mobile station, for example, a display example of a liquid crystal display. In FIG. 5, 51 indicates the display format in the state of (A), 52 indicates (B), 53 indicates (C), and 54 indicates (D). In addition to (A) to (B), when the mobile station device is located outside the area of the service zone, it is displayed as 55.

In this embodiment, the standby state is identified mainly by the difference in the display format of the reception level. That is, in the conventional standby state, the filled bar display is shown in (D), the filled bar display is blinking in (C), the white bar display is shown only with a frame in (B), and in (A) "Transmission is restricted: 3 minutes left 0:00 seconds ”. "Out of service" is also displayed in the same area. The display of the remaining regulation time in the display format of (A) is assumed to decrease according to the count value of the regulation timer. As described above, the user can easily distinguish the standby state by the difference in the display format of the reception level.

In the present embodiment, the regulation standby mode is provided as described above, and the "location registration" at the time of power-on or standby reception can be prohibited, so that the occurrence of random access in the service area is reduced. It becomes possible to do.

In addition, when the communication is restricted, two standby modes, one with the restriction and the other without the restriction, are provided, and the reception level display format is different in each mode, so that the user can grasp the status of the wireless line. , There is little confusion due to regulations.

Further, since the regulation end time is transmitted to the mobile station via the broadcast channel, the clock function on the mobile station side allows
It is a system that can notify the user of the duration of regulation.

Regarding the emergency communication, since the user's call request is constantly monitored in the regulation waiting mode (3
05), reporting is not prohibited by regulation.

[0063]

According to the present invention, the occurrence of random access of mobile stations can be regulated especially when communication is congested, such as when a disaster occurs, and therefore, temporary concentration of wireless lines can be prevented. It will be possible. This means that the collision rate of random access can be reduced when viewed from the mobile station device, and it is effective in preventing the user from being confused by the failure of the "location registration" and the display of "out of service".

Further, due to the communication regulation of general communication, priority is held for access for emergency communication,
The mobile communication system is suitable for operation during a disaster.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a system configuration of an embodiment.

FIG. 2 is a flowchart of an operation of the mobile station apparatus according to the embodiment when the power is turned on.

FIG. 3 is a flowchart of the operation of the mobile station device in the regulation standby mode according to the embodiment.

FIG. 4 is a flowchart of the operation of the mobile station apparatus of the embodiment in the non-regulation standby mode.

FIG. 5 is an explanatory diagram of a display example of a display unit of the mobile station device according to the embodiment.

FIG. 6 is an explanatory diagram of a relationship between a TDM frame transmitted from a base station of a conventional example and a random access operation of a mobile station.

[Explanation of symbols]

 1 ... General telephone, 2 ... Public exchange, 3 ... Automobile telephone exchange, 4,5,6 ... Base station equipment, 7,7 '... Mobile station equipment, 8 ... Police station command center, 9 ... Fire station command center, 10 ... Service zone, 51-55 ... Display example, 61,62 ... Mobile station apparatus, 201-213 ... Operation step, 301-317 ... Operation step, 401-412 ... Operation step, 601, 602 ... Collision control bit.

Claims (5)

[Claims] 1. A base station provided in a service area and a plurality of mobile stations existing in the service area are connected by a wireless line, and each mobile station is connected to another network via the base station. In the mobile communication system, the communication operation information for temporarily prohibiting the transmission operation of the mobile station with respect to a random access channel with a time width of a group-selective and finite length is provided, and the communication restriction information is broadcast on a broadcast channel. A mobile station access restriction method, wherein the mobile station is transmitted via the mobile station. 2. The access regulation method according to claim 1, wherein the communication regulation information includes number information indicating a numerical condition of a mobile station telephone number to be regulated and information on an end time of a communication regulation time. 3. Receiving the communication regulation information according to claim 2,
When it is detected that your station is subject to restrictions, within your call prohibition time, you will be able to call your own station except for individual calls and emergency communications where the user requests police notification and fire / emergency notifications. A mobile communication system having a mobile station having an outgoing call prohibiting function for prohibiting communication and an output function for notifying a user of whether or not communication is being restricted. 4. The mobile station also has a clock function, obtains the remaining regulation time from the regulation end time detected from the communication regulation information and the current time obtained from the clock function, and gives the remainder to the operator. The mobile communication system according to claim 3, wherein display output is performed. 5. A mobile station is provided with two different standby reception modes for the case of being subject to the access restriction and for the case of being not subject to the access regulation, and having a mobile station adapted to change the display format of the reception level in each case. The mobile communication system according to claim 4.