JP2001078260A - Congestion control method in mobile communication system, mobile terminal and base station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a congestion control method in a mobile communication system where a call can be made depending on a type of a communication service even in a congestion state. SOLUTION: In this mobile communication system, a base station 1 always monitors a congestion state of a radio zone, calculates a congestion level and informs a mobile terminal 2 about it as congestion information. The mobile terminal 2 restricts a call transmission in response to the congestion level, a type of a communication service or priority of the call. A memory section 3 comprises a congestion information storage memory 3a, a terminal class storage memory 3b, a call type storage memory 3c, a service class storage memory 3d storing classes of a communication service function such as voice communication, a short message and image communication or the like, and a service restriction item storage memory 3e or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a congestion control method in a mobile communication system, a mobile terminal, and a base station.

[0002]

2. Description of the Related Art In recent years, demand for mobile communication has been rapidly increasing. Among them, in a commercial mobile communication system, although a wireless zone (base zone) covered by one base station is relatively wide, a communication channel (service channel) in one wireless zone is 5 or 6 channels. It is only a few. Therefore, when a disaster or the like occurs in a certain wireless zone and a large number of calls occur, it is likely to be congested.
However, business mobile communication is used by users with a strong public color, and therefore it is necessary to construct a network that prevents the service function of the system from deteriorating at the time of call congestion.

Conventionally, when congestion occurs in a radio zone of a mobile communication system, an emergency call is prioritized for setting up a call.
For example, it is known from JP-A-5-75536. FIG. 9 is a functional block diagram on the mobile terminal side for explaining a conventional congestion control method of a mobile communication system. FIG. 10 is a flowchart for explaining the operation of the conventional mobile terminal shown in FIG.

In FIG. 9, reference numeral 41 denotes a dial receiving unit which receives a dial number input by a user. Reference numeral 42 denotes an emergency call number recording unit, which records an emergency call number such as a police call number, a fire call number, and a general call special number as a table. 4
Reference numeral 3 denotes an emergency call identification unit which identifies the emergency call by comparing the received dial number with the emergency call number recorded in the emergency call number recording unit 42. Reference numeral 46 denotes a call type display recording unit which inputs and records an emergency call from the emergency call identification unit 43 and displays the call type on a display unit (not shown). 5a is a receiving unit,
The control unit receives the restriction status information of the wireless zone from a base station (not shown). Reference numeral 44 denotes a regulation state recording unit which records the received regulation state information.

[0005] Reference numeral 45 denotes an outgoing call control unit, which performs an outgoing call operation (call setting) as usual, regardless of the call type, by referring to the regulation state display recording unit 44 if the state is not a regulation state. With reference to the regulation state display recording unit 44, if the regulation state, if the emergency call identification unit 43 does not identify the emergency call, outgoing operation is prohibited, and if the emergency call is identified, even if the regulation state, Make a call as usual.
Reference numeral 5b denotes a transmission unit, and when the transmission control unit 45 performs a transmission operation, starts a control procedure for call setting for a base station (not shown).

The operation of the conventional mobile terminal shown in FIG. 9 will be described with reference to FIG. First, a handset (not shown) of the mobile terminal is operated off-hook to input, for example, a police dial number (police call number). In S51, the dial receiving unit 41 receives this dial number, records it in the dial recording unit, and proceeds to S52. The emergency call number recording unit 42 stores an emergency call number table in advance. In S52, the emergency call identification unit 43 collates the dial number recorded in the dial number recording unit with the emergency call number recorded in the above-mentioned emergency call number table, and proceeds to S53.
Processing proceeds to

In S53, as a result of the collation, if the input dial number is an emergency call, the process proceeds to S54, and if not, the process proceeds to S55. As described above, if the dial number is a police call number, it matches one of the emergency call numbers, so the process proceeds to S54, and sets data for displaying an emergency call in the call type display recording unit 46. Then, an emergency display is made on the display unit, and the process proceeds to S57. If the dialed number is a general call,
The process proceeds to S55, where data for displaying a general call is set in the call type display recording unit 46, and the process proceeds to S57.

Here, since the number of available communication channels (service channels) of the base station is limited, when the traffic volume increases, the base station sends regulation information to mobile terminals within its own radio zone. . The regulation information sent from the base station is received by the receiving unit 5a and recorded in the regulation state display recording unit 44. In S56, the transmission control unit 45 is activated, and determines whether or not the restriction information is recorded in the call type display recording unit 46, thereby analyzing the restriction state.

The transmission control unit 45 includes a regulation state display recording unit 4
When the regulation information is recorded in No. 4, the process proceeds to S57, and when the regulation information is not recorded, the process proceeds to S61. In S57, the emergency call identification unit 43 identifies the call type, and the process proceeds to S58. In S58, the transmission control unit 45 proceeds to S61 if the call is an emergency call, and proceeds to S59 if it is not an emergency call. The terminal class display recording unit records whether this mobile terminal is a general class or a priority class.

In S59, the transmission control unit 45 identifies the terminal class by reading out the terminal class display recording unit, and proceeds to S60. In S60, the transmission control unit 45 proceeds to S61 if the class is the priority class,
If it is a general class, the process proceeds to S62. In step S61, in which the process proceeds from step S56 or S60, the transmission control unit 45 transmits a dial number to the transmission unit 5b to perform a transmission process. Further, in S62, the transmission control unit 45 performs a restricting process so that the dial number is not transmitted to the transmitting unit 5b, the process proceeds to S63, and the restricting sound is generated from the handset, thereby restricting the user. To inform.

As a result, when the dial number is a police call number, the process immediately proceeds from S57 and S58 to S61, so that even a general-class mobile terminal is treated as the same as the priority class, and preferentially S61. The call originating process is performed in, and the subsequent call setting is performed. If the call is not an emergency call, the terminal class is identified in S58 and S59. Therefore, in a restricted state, a general call from a general class mobile terminal is subjected to a restriction process and a restriction sound is transmitted.

As described above, in a radio zone covered by one base station, even if a communication network is congested and transmission is restricted, even if an emergency call is made, a call can be made from a general class mobile terminal. can do. However, lower priority calls,
For example, for general calls from general class mobile terminals, outgoing calls are uniformly regulated, and users cannot communicate at all. However, even in a congested state, it is desired to provide a minimum communication service to the user and prevent the service function of the communication system from being degraded. Furthermore, even when the call is in a congested state, if a high-priority call is generated, it is desirable to enable call setting and secure a high-priority communication to prevent the communication system from deteriorating.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and has been described in connection with a mobile communication system capable of making a call depending on the type of communication service even in a congested state. It is an object to provide a control method and a mobile terminal. It is another object of the present invention to provide a congestion control method and a base station in a mobile communication system for securing communication of a call having a high priority even in a congested state.

[0014]

According to the present invention, in the first aspect of the present invention, at least one mobile terminal exists in a radio zone covered by a base station, and the mobile terminal communicates with the base station. A congestion control method in a mobile communication system performing communication between the mobile terminals or between the mobile terminals, wherein the base station monitors a congestion state, notifies congestion information to the mobile terminal, and the mobile terminal In addition to receiving the congestion information from a station, the congestion information and at least the communication service type of the communication service requesting the call are input, and transmission is restricted based on the communication service restriction standard. Therefore, it is possible to determine whether to make a call or to restrict the call for each type of communication service according to the congestion state. The communication time is roughly determined according to the communication service type. Therefore, a minimum communication service can be provided by determining a communication service that can be transmitted in consideration of the congestion state. Further, since the transmission is restricted according to the congestion state, an increase in the traffic of the communication network is suppressed, and as a result, the deterioration of the congestion state of the communication network can be avoided.

According to a second aspect of the present invention, in the congestion control method for a mobile communication system according to the first aspect, the congestion information is created based on a total number of the mobile terminals during communication or call setup processing. Is what is done. Therefore, the congestion state can be easily known from the congestion information described above.

According to a third aspect of the present invention, in the congestion control method for a mobile communication system according to the first aspect, one or a plurality of degradation determination thresholds are set, and the loss probability within a predetermined measurement time is determined by the degradation determination. The congestion information is created according to the smallest deterioration determination threshold when the number of times of deterioration determination that deteriorates below the threshold value is within a predetermined upper limit value during a predetermined determination period. Therefore, the congestion state can be accurately known from the congestion information described above.

In the invention described in claim 4, one or more mobile terminals exist in a radio zone covered by the base station, and the mobile terminal communicates with the base station or between the mobile terminals. The mobile terminal in the mobile communication system to perform the reception, receiving means for receiving the congestion information from the base station, input means for inputting a communication service type of a communication service to request a call, the congestion information and the communication service A service restriction judging unit for restricting the transmission based on the restriction standard of the communication service using the type as at least an input condition is provided. Therefore, it is possible to determine whether to make a call or to restrict the call for each type of communication service according to the congestion state.

According to a fifth aspect of the present invention, in the mobile terminal in the mobile communication system according to the fourth aspect, a priority of a call is included in the input condition. Therefore, it is possible to change the communication service whose transmission is restricted according to the congestion state according to the priority of the call.

According to a sixth aspect of the present invention, in the mobile terminal in the mobile communication system according to the fifth aspect, the priority of the call is determined by a call type for which a call is requested and / or a terminal class of the mobile terminal. Is determined based on Therefore, the communication service whose transmission is restricted according to the congestion state can be changed depending on the call type for which a call is requested and / or the terminal class of the mobile terminal.

[0020] According to the invention described in claim 7, in claim 4 of the present invention.
7. The mobile terminal according to any one of claims 6 to 6, further comprising a service restriction item storage memory for storing a service type for which transmission is restricted and / or a service type for which transmission is not restricted. In accordance with the input condition, transmission is restricted by reading the service restriction item storage memory. Therefore,
It is possible to easily set and refer to the service regulation standard determined according to the input condition.

According to the invention described in claim 8, in the mobile terminal in the mobile communication system according to any one of claims 4 to 6, the congestion information has a plurality of congestion levels, The restriction judging means restricts transmission from a communication service which is likely to cause congestion as the congestion level increases. Therefore,
It is possible to efficiently suppress an increase in the traffic of the communication network, and as a result, it is possible to avoid the deterioration of the congestion state of the communication network.

According to a ninth aspect of the present invention, in the mobile terminal in the mobile communication system according to any one of the fourth to sixth aspects, the congestion information has a plurality of levels of congestion levels, The restriction judging means restricts the transmission of the call from the one having the lower priority as the congestion level becomes higher. Therefore, it is possible to suppress an increase in the traffic volume of the communication network while considering the priority of the call, and as a result, it is possible to avoid the deterioration of the congestion state of the communication network.

According to a tenth aspect of the present invention, in the mobile terminal according to any one of the fourth to sixth aspects, the congestion information has a plurality of levels of congestion levels, and In accordance with an increase in the congestion level, the outgoing call is restricted based on the likelihood of congestion of the communication service and the priority of the call. Therefore, it is possible to efficiently suppress the increase in the traffic volume of the communication network while considering the priority of the call, and as a result, it is possible to avoid the deterioration of the congestion state of the communication network.

[0024] In the invention according to claim 11, in the mobile terminal according to any one of claims 4 to 10, the congestion information has a plurality of levels of congestion levels, and Regardless of the congestion level, the transmission of short message communication services is not restricted. Since the short message communication has a relatively short communication time, it is possible to provide a minimum communication service and suppress an increase in the traffic of the communication network.

According to a twelfth aspect of the present invention, in the mobile terminal according to any one of the fourth to eleventh aspects, the congestion information has a plurality of levels of congestion levels, and , According to the congestion level,
It regulates outgoing voice communication services. Voice communication services require a certain amount of communication time, and because they are frequently used, by restricting outgoing calls according to the congestion level, efficiently suppress the increase in traffic on the communication network,
As a result, it is possible to avoid deterioration of the congestion state of the communication network.

In the invention according to claim 13, in the mobile terminal according to any one of claims 4 to 12, the mobile terminal has a plurality of levels of congestion levels, and The transmission of the image communication service is regulated accordingly. Since image communication services require long communication time, by restricting outgoing calls according to the congestion level, it is possible to efficiently suppress an increase in traffic on the communication network,
As a result, it is possible to avoid deterioration of the congestion state of the communication network.

[0027] In the invention according to claim 14, one or more mobile terminals exist in a radio zone covered by a base station, and the mobile terminal communicates with the base station or between the mobile terminals. A congestion control method in a mobile communication system, wherein the base station monitors a congestion state, and when the mobile terminal originates a call, the congestion state is a predetermined level or more, and When the call priority of the terminal is higher than the call priority of the communicating mobile terminal, the communication of the communicating mobile terminal is forcibly disconnected, and a communication channel is allocated to the calling mobile terminal. is there. Therefore, even if the congestion state is equal to or higher than a predetermined level, communication of a call with a high priority can be secured, and call loss of a call with a high priority can be avoided.

In the invention according to claim 15, one or more mobile terminals exist in a radio zone covered by the base station, and the mobile terminal communicates with the base station or between the mobile terminals. A base station for monitoring a congestion state, a receiving unit for detecting a call from the mobile terminal, and a first terminal for storing terminal information of the detected mobile terminal. Information storage means, second terminal information storage means for storing terminal information of the mobile terminal in communication, and when the congestion state is equal to or higher than a predetermined level, based on the first and second terminal information. Determining means for comparing the call priority of the mobile terminal that is communicating with the mobile terminal in which the call is detected, and the mobile terminal in which the call is detected is more than the mobile terminal in communication, When the call priority is high, As well as forced termination of communication of the mobile terminal in the serial communication, and has a control means for assigning a communication channel to the display of the origin detected the mobile terminal.
Therefore, even if the congestion state is equal to or higher than a predetermined level, communication of a call with a high priority can be secured, and call loss of a call with a high priority can be avoided.

[0029] In the invention according to claim 16, in the base station in the mobile communication system according to claim 15, the priority of the call is determined according to the type of call originated and / or the terminal class of the mobile terminal. It is determined on the basis of: Therefore, communication can be ensured according to the type of the call originated and / or the terminal class of the mobile terminal even in a congested state.

[0030]

FIG. 1 is a block diagram for explaining a first embodiment of the present invention. The connection method between the base station 1 and the mobile terminal 2 is an immediate connection method, and therefore, a free communication channel (service channel) at the time of calling.
The call can be set up only if there is, and if there is no free space, the call is discarded without waiting. The channel assignment algorithm assigns a priority to a call and assigns a channel. The call priority is determined by, for example, one of the contents of a call such as a general call and an emergency call and the priority of a terminal class of a mobile terminal, or a combination of both. In the case of determining by a combination of both, there are two methods. A first method is to set a priority level based on a combination.
The second way is to set the priority level individually for each,
This is a method in which each priority level is combined. In the first embodiment, the priority of a call is determined by the latter method.

The base station 1 constantly monitors the congestion state of the radio zone, calculates the congestion level, and notifies the mobile terminal 2 of the congestion level as congestion information. On the other hand, the mobile terminal 2
In accordance with the congestion level and the type of communication service, furthermore, the call priority is added thereto, and the outgoing call regulation (the outgoing call regulation)
I do. Note that the base station 1 may send data monitoring the congestion state to the mobile terminal 2 as congestion information, and the mobile terminal 2 may calculate the congestion level from the monitoring data.

A base station controller 1a calculates a congestion level and sends congestion information to the mobile terminal 2 via a transmitter (not shown). The mobile terminal 2 includes a memory unit 3, a display unit 4, a transmission / reception unit 5, a comparison unit 6, a user I / F (user interface) unit 7, and a mobile terminal control unit 8. The illustration and description of a baseband unit, a modem unit, a front end, and the like that process call information (user data) are omitted.

The transmission / reception unit 5 includes call information (user data)
In addition to sending and receiving of control information, transmission and reception of control information and reception of congestion information are performed. The memory unit 3 includes a congestion information storage memory 3a for storing the congestion level transmitted from the base station 1 via the transmission / reception unit 5, a general class, a priority class, and the like fixedly assigned to the mobile terminal 2 at the time of shipment from a factory. A terminal class storage memory 3b storing a terminal class, a call type storage memory 3c storing a call type such as an emergency call, which is input via the user I / F unit 7 when the user makes a call request, and Input via the user I / F unit 7 when making a call request;
Service type storage memory 3 for storing types of communication service functions such as voice communication, short message, and image communication
d, a service restriction item storage memory 3e which is preset in the mobile terminal at the time of shipment from the factory and which will be described later with reference to FIG.

[0034] The mobile terminals of the priority class include, for example, mobile terminals used by some special users who need communication preferentially in the event of a disaster. The dial numbers regarded as emergency calls include, for the same reason, dial numbers of fire departments, police departments, and the like. The service types include voice communication, short message communication, moving image communication, still image communication, facsimile communication, and other data communication.
Hereinafter, three types of communication services of voice, a short message, and a (still) image will be described as specific examples. The short message communication is a character message with a limited number of characters, such as a fixed phrase or a free phrase.

Each of the functional blocks described above includes a ROM (Read
The CPU (Central Processing Unit) operated by the control program stored in the
It is executed by controlling each hardware such as the input I / F unit 7, the display unit 4, and the transmission / reception unit 5 using M (Random Access Memory). For example, a RAM is used as the above-described congestion information storage memory 3a, call type storage memory 3c, and service type storage memory 3d. The terminal class storage memory 3b and the service restriction item storage memory 3e described above include, for example, an electrically erasable EEPROM (EEPROM).
The stored contents are written at the time of factory shipment using a ROM such as d programmable read only memory), but the contents may be rewritten by a system administrator after shipment.

Call type identification section 7a in user I / F section 7
Identifies the call type from the dial number input by the user using push button dialing or the like, writes the call type in the call type storage memory 3c, and stores the service type identification unit 7b in the user I / F unit 7 in the service mode. The service type input by the user is identified using a button or the like, and this is written to the service type storage memory 3d.

The determination unit 6 inputs the contents stored in the congestion information storage memory 3a, the terminal class storage memory 3b, and the call type storage memory 3c, and calls the dial number entered by the user based on the service regulation standard. It is determined whether or not the type and the service type are to be provided for communication service in the terminal class of the user's mobile terminal and the current congestion state, and the result of the determination is determined by the service control unit 8.
output to a. The service restriction unit 8a controls the transmission control unit 8b so as not to make a call even if a call request is made when the service is a service to be restricted from outgoing calls. The call control unit 8b makes a call setting with the dial number destination input in response. The display unit 4 displays a service type, a congestion state, a transmission restriction state, and the like stored in the memory 3 as necessary, and generates an audible display by generating a restriction sound.

FIG. 2 is a functional block diagram of the mobile terminal for explaining the operation of the first embodiment of the present invention. In the figure, the same parts as those in FIGS. 1 and 9 are denoted by the same reference numerals, and description thereof will be omitted. FIG. 3 is a flowchart on the mobile terminal side for explaining the operation of the first exemplary embodiment of the present invention.
FIG. 4 is an explanatory diagram of the contents of the service regulation item storage memory 3e shown in FIGS.

The operation will be described along the flow of FIG. 3 with reference to other drawings. First, when a user's call request is detected by detecting an off-hook operation or the like,
In S11, the call type from the call type identification unit 7a and the service type from the service type identification unit 7b are stored in the call type storage memory 3c and the service type storage memory 3d, respectively. At the same time, for example, call type information such as emergency / general is displayed on the call type display section 4a of the display 4, and the process proceeds to S12.

The congestion information such as the congestion level notified from the base station control unit 1a at an appropriate timing is received by the receiving unit 5a, and the congestion information stored in the congestion information storage memory 3a is sequentially updated with the latest information. Will be updated to There are various methods for calculating the congestion level. Here, two specific examples will be described.

In the first method, the total number of mobile terminals in communication or call setup processing in a wireless zone at a certain point in time is monitored, and is created based on this total number. In the second method, one or a plurality of deterioration determination thresholds B _k are set in advance. When the call blocking rate within the predetermined measurement time T ₀ has deteriorated from each of the deterioration determination thresholds B _k with respect to each of the deterioration determination thresholds B _k , the number of deterioration determinations is counted as one, and this count is taken as the time length T ₀ C over a longer predetermined judgment period T ₁ than the deterioration determination count at that time, when made within a predetermined upper limit value n times, depending on the value of the smallest degradation determination threshold value B _k, calculates a congestion level . As the call loss rate, for example,
A call is made from a mobile terminal in a wireless zone to a base station, but a call channel (service channel) is not allocated, and the number of calls not connected for communication is divided by the total number of call channels. .

More specifically, using numerical values for explanation, it is assumed that T ₀ = 10 seconds, T ₁ = 2 minutes, and n = 5 times. At this time, B ₁ = 30%, B ₂ = 40%, and B ₃ = 50%.
If n = 5 or less when B ₁ = 30%, the congestion level is set to 0. Further, if n = 5 or less for the first time when B = 40%, the congestion level is set to 1.
Further, when n = 5 or less for the first time when B = 50%, the congestion level is set to 2. Here, B = 5
If n does not fall within 5 times even when it is set to 0%, the congestion level is set to 3. Here, the congestion level 0 is a level at which the degree of congestion is the lowest including a state in which no congestion occurs, and a congestion level 3 indicates a state of the most congestion.

At S12, the congestion information storage memory 3a
The congestion state is analyzed by reading out the congestion level stored in the storage unit, and the congestion level is output to the determination unit 6 and the congestion level display unit 4c, and the process proceeds to S13. The congestion level display unit 4c informs the user of the congestion level by, for example, numbers such as 0, 1, 2, 3, and the like. In S13, the determination unit 6 determines the call of the call currently requested by the user to be stored in the call type storage memory 3c, the service type storage memory 3d, the terminal class storage memory 3b, and the congestion information storage memory 3a. The call type, the service type, the terminal class, and the current congestion level of the communication network are inputted, and the requested communication service is regulated by referring to the service regulation item table stored in the service regulation item storage memory 3e as a criterion. It is determined whether or not to do so, and the process proceeds to S14.

FIG. 4A shows that the terminal class is the "priority class".
FIG. 4B is an explanatory diagram showing whether the service is available (transmission processing) or prohibited (transmission restriction) when the terminal class is the “general class”.
Such a criterion is stored in the service restriction item storage memory 3e in the form of a reference table. For example, an address is specified based on a call type, a terminal class, and a congestion level, and one or a plurality of service types for restricting outgoing calls are stored in the address. It is determined whether the service type matches the service type read from the storage memory 3e. Conversely, the service restriction item storage memory 3e may store a service type for which service restriction is not performed, or may store a service type for which service restriction is not performed and a service type for which service restriction is not performed.

The basic concept of communication service regulation is to regulate the transmission for each service type in accordance with the congestion level. As the congestion level increases, congestion is likely to occur, and long communication due to the large amount of information. In this method, transmission is restricted from a communication service that requires time (hold time).

In the example shown in FIG. 4 (a), when the terminal class is a priority class and a general call, for a voice communication service, the outgoing call is restricted only when the congestion level reaches the highest level 3, and the image communication service For, the transmission restriction is performed when the congestion level is 2 or more. On the other hand, transmission restriction is not performed for a short message having a short communication time due to a small transmission amount. On the other hand, when the terminal class is the priority class and an emergency call is made, only for the image communication service, the outgoing call restriction is performed when the congestion level is 2 or more, similarly to the general call.

The example shown in FIG. 4B is a case where the terminal class is general and a general call. For voice communication services, outgoing calls are restricted only when the congestion level reaches 2.
As for the image communication service, transmission restriction is performed for a congestion level of 1 or more. For short messages,
No call restriction is performed regardless of the congestion level. On the other hand, when the terminal class is general and the call is an emergency call, the terminal class is prioritized and the same as the case of the emergency call.

In the above-described example, when the congestion level is high (for example, level 3), even if the call requesting communication is a general call, a short message that can transmit necessary information in a short communication time is used. For the communication service only, the mobile terminal 2 accepts a user's call request, and the communication service is available. Therefore, the user can secure only the minimum communication service.

When the congestion level is high (for example, level 3), the transmission of voice communication service and image communication service is restricted for general calls, and only the image communication service is restricted for emergency calls. . The communication time is short for the short message communication service that is not restricted in transmission.
Therefore, when the congestion level is high, there is no possibility that the call volume will increase significantly more than the current level, so that the call loss rate can be improved and the congestion state can be avoided. Since the call is made by the service, the number of mobile terminals with which communication is performed can be increased.

For image communication that requires a large amount of information and requires a long communication time, congestion is more likely to occur than voice communication services. Can be avoided. Further, in the above-described example, the communication service according to the priority of the terminal class is provided. Is raised by one level. With respect to the emergency call, the outgoing call regulation is relaxed as compared with the general call, and the outgoing call regulation is performed only when the congestion level is 2 or more only for the image communication service.

In S14, according to the determination result, the service restricting unit 8a is instructed whether or not to restrict the service, and the process proceeds to S15. In S15, the service control unit 8a advances the process to S16 when service control is not performed, and advances the process to S17 when service control is performed. In S16, the transmission control unit 8b
Let b transmit for call setup to the base station.
On the other hand, in S17, the transmission control unit 8b performs the communication refusal process, displays the reason for the transmission failure on the transmission failure reason display unit 4b, and proceeds to S18. For example,
When a call request is made for a call having a low priority due to a low priority of the call type or the terminal class, an indication such as "all communication channels in use" is displayed. In S18, a restriction sound indicating that the call request is rejected is emitted from the receiver of the mobile terminal 2 or the like.

FIG. 5 is a functional block diagram of a base station for explaining a second embodiment of the present invention. In the figure, the same parts as those in FIG.
21 is a mobile terminal A, 22 is a mobile terminal B, 23 is a receiving unit,
24 is a congestion level calculation unit, 25 is a mobile terminal information read unit, 26 is a mobile terminal information storage memory during communication, 27 is a determination unit, 28 is a congestion level determination reference storage memory, 29 is a call priority comparison reference storage memory, 30 is a control information creation unit, 3
1 is a transmission unit.

Each of the functional blocks described above includes a ROM (Read
The CPU (Central Processing Unit) operated by the control program stored in the
This is executed by controlling hardware such as the receiving unit 23 and the transmitting unit 31 using an M (Random Access Memory). Illustration and description of a baseband unit, a modem unit, and the like that process call information (user data) are omitted. The base station 1 is connected to a general subscriber telephone network or the like via a command console, a line control device or a control station (not shown).

FIG. 6 is an explanatory diagram of the contents stored in the congestion level judgment criterion storage memory 28 of FIG. FIG. 7 is an explanatory diagram of the contents stored in the call priority determination criterion storage memory 29 of FIG. In this embodiment, mobile terminal A21 and mobile terminal B
22 is a mode in which communication is performed via the base station 1 or a mode in which the mobile terminal A21 communicates with a subscriber such as a command desk or a general subscriber telephone network via the base station or the control station. Things.

In a congestion state, when a new call from a mobile terminal in the wireless zone is received through the control channel, the base station newly calls a plurality of calls of a plurality of mobile terminals currently communicating. The priority of the call of one mobile terminal currently in communication is lower than the priority of the call of the current mobile terminal, and the current communication of the lower priority call is forcibly disconnected, and the communication channel (Service channel) and set up a new call with a high priority.

In FIG. 5, the receiving section 23 of the base station 1
When a call is received, mobile terminal information is received from the calling mobile terminal, for example, mobile terminal A21. The mobile terminal information generally includes a call type, a terminal class, a service type,
It contains location information, call information (user data), etc., but receives the call type and terminal class when receiving this call. Also, by the time the call setup is completed and the communication connection is established, the other mobile terminal, for example, the mobile terminal B22,
A terminal class is received as mobile terminal information.

The congestion level calculator 24 calculates the congestion level using the information obtained from the receiver 23 by the method described with reference to FIG. 1 and outputs it to the control information generator 30 to output the congestion information. And a determination unit 27 to be described later.
Output to The mobile terminal information reading unit 25 includes the receiving unit 2
3 to read and store the call type and the terminal class from the mobile terminal information received. During the communication, the mobile terminal information storage memory 26 stores the mobile terminals A21 and B22 when the call setting of the mobile terminal that has newly requested communication is completed and the mobile terminal is in communication.
Is stored as the communicating mobile terminal information in the communicating terminal information storage memory 26 from the mobile terminal information reading unit 25.

The call type of the called mobile terminal B22 matches the call type of the calling mobile terminal A21. When multiple call channels (service channels) are in use,
The in-communication terminal information storage memory 26 stores call types, terminal classes, and the like of all mobile terminals that are communicating. In the case of a mobile communication system in which an individual number of a mobile terminal is registered in a control station connected to the base station 1, if the terminal class is registered together with this individual number, the mobile terminal will thereafter receive the individual number. Is transmitted to the base station, and there is no need to transmit the terminal class. The base station can know the terminal class from the individual number by making an inquiry to the control station.

As an example, it is assumed that only mobile terminal A 21 and mobile terminal B 22 are performing wireless communication via base station 1 in the wireless zone of base station 1. It is assumed that the call type of both mobile terminals A21 and B22 is a general call, and the terminal class is a general class. These pieces of information are stored in the communicating terminal information storage memory 26. Therefore, when a mobile terminal C of a general class (not shown) requests the base station 1 to communicate with the mobile terminal A21 with the call type as an emergency call, the determination unit 27 calculates the congestion level by the congestion level calculation unit 24. A congestion level is inputted, and a congestion level judgment reference storage memory 2
Based on the determination criteria stored in No. 8, it is determined whether or not it is possible to forcibly disconnect a low priority call. The congestion level determination criterion storage memory 28 creates an address based on the congestion level, for example, and reads out data indicating whether or not forced disconnection is enabled at the address.

As shown in FIG. 6, when the congestion level is level 1, 2, or 3, forced disconnection is enabled. If the forcible disconnection is possible, the determination unit 27 then stores the mobile terminal information of the mobile terminal C that made the call, stored in the mobile terminal information reading unit 25, and the communicating mobile terminal information storage memory 2
6 based on the mobile terminal information of the mobile terminals A21 and B22 stored in No. 6 and refers to the criterion stored in the call priority comparison reference storage memory 29 to compare the call priority of each mobile terminal. As a result of the comparison, mobile terminal C requesting communication
Is higher than the call priorities of the communicating mobile terminals A21 and B22, the control signal generation unit 30 is notified of the communication channels (service channels) of the mobile terminals A21 and B22. A control signal for forced disconnection is generated.

In the example shown in FIG. 7, the call priority determination criterion storage memory 29 outputs four levels of call priorities 0 to 3 according to the combination of the terminal class and the call type. That is, when the call is a general call in the general class, the priority of the call is set to the lowest level 0. If the priority class is an emergency call, the priority of the call is set to the highest level, level 3. Level 1 is for a general call in the priority class, and level 2 for an emergency call in the general class. In addition,
Level 1 may be used for an emergency call in a general class, and level 2 for an ordinary call in a priority class. In the specific example described above, since the priority of the call of the mobile terminal C newly originating is 2 and the priority of the calls of the communicating mobile terminals A21 and B22 are each 0, the determination unit 28 Instruct disconnection.

As in the above-described example, when the mobile terminal C is requesting communication with the communicating mobile terminal A21, the mobile terminal C is the mobile terminal that is requesting communication. Instead of comparing with the call priority of A21, only the call priority of mobile terminal B22 of the current communication partner of mobile terminal A21 may be compared. Also, even if there is a mobile terminal that is communicating other than the mobile terminals A21 and B22,
When the mobile terminal C requesting communication is the communicating mobile terminal A21, the call priority of the mobile terminals A21 and B22 or the call priority of the mobile terminal B22 and the mobile terminal C It suffices to compare this with the priority of the call.

When receiving an instruction to forcibly disconnect the call from the determination unit 27, the control signal creation unit 30 transmits a control signal for forcibly disconnecting the connection from the transmitting unit 31 of the base station to the communication channel or control channel. Via the mobile terminal A21,
B22. Mobile terminal A2 receiving this control signal
1, B22 disconnects the mutual communication. Thereafter, the base station 1 starts a call setting procedure so that communication between the mobile terminal C and the mobile terminal A21 can be performed.

As described above, by enabling the forcible disconnection of a low-priority call, the call loss of a high-priority call can be improved. Even if all communication channels (service channels) are in use, if a low-priority call is being communicated, the currently communicating call is forcibly disconnected, so that a call with a high-priority call can be communicated. Channels can be assigned.

FIG. 8 is a functional block diagram of a base station for explaining the third embodiment of the present invention. In the figure, the same parts as those in FIGS. 1 and 5 are denoted by the same reference numerals, and description thereof will be omitted. This embodiment is a mode in which, after the call setup is completed, call information (user data) is transmitted and received between the mobile terminals A21 and B22 without passing through the base station 1.

In a congestion state, when a new communication request is issued from a mobile terminal in the wireless radio zone, the base station 1 calls a plurality of calls of a plurality of mobile terminals currently communicating with each other.
Compare the call priority of the newly requested mobile terminal with the
If the priority of a call of a certain mobile terminal that is currently intercommunicating is lower, the current intercommunication having a lower priority is forcibly disconnected, and the call setting of a higher priority call newly requested for communication is performed. Is what you do.

In such an intercommunication mode as well, the receiving section 23 of the base station is provided with the mobile terminal A21 and the mobile terminal B22.
, Mobile terminal information such as a mobile terminal call type and a terminal class. In this example, the call information is directly transmitted and received between the mobile terminals without passing through the base station. The congestion level calculator 24 calculates a congestion level. The mobile terminal information reading unit 25 reads out and stores the mobile terminals A21 and B22 and the call type and the terminal class of the newly called terminal C (not shown) from the receiving unit 23. The communicating mobile terminal information storage memory 26 stores a call type, a terminal class, and the like of a mobile terminal that is communicating with each other.

The determination unit 27 determines the congestion state, and compares the call priority of a plurality of mobile terminals A21 and B22 currently communicating with the call priority of a mobile terminal that has newly requested communication.
This comparison operation is the same as in the second embodiment described with reference to FIG. 5, and a description thereof will be omitted. Control signal generator 3
The forcible disconnection signal created at 0 is transmitted from the transmitting unit 31 to the mobile terminals A21 and B22 that are communicating with each other, and the mobile terminals A21 and B22 disconnect the mutual communication. Thereafter, the base station 1 starts a call setting procedure so that the mobile terminal C and the mobile terminal A21 can perform mutual communication.

When the communication mode in which the base station is relayed as shown in FIG. 5 and the mutual communication mode in which the base station is not relayed as shown in FIG. By comparing the priority of the call of the mobile terminal with the priority of the call of the mobile terminal that has newly made a communication request, similarly, the communication of the low priority call is forcibly disconnected and a new communication request is made. A call can be set.

Since the short message communication service is the minimum communication service, if the communication service being communicated is the short message communication service, it can be excluded from the target of the forced disconnection. In addition, the congestion level at which forced disconnection is performed may be reduced as the service type is more likely to cause congestion.

In the above description, the business mobile communication system has been described. However, the present invention can be applied to a public mobile communication system. In addition, mobile communication systems include FDM
A (Frequency Division Multiple Access), TDMA
(Time Division Multiple Access), CDMA (code
Various multiple access schemes such as Division Multiple Access) are known, but the present invention is not limited to a specific multiple access scheme.

[0072]

According to the present invention, as is apparent from the above description, there is an effect that a call can be made depending on the type of communication service even in a congested state. As a result, for example, even when the communication network is in a congestion state and the priority of the call is low at this time, it is possible to prevent a decrease in the service function of the system by securing a communication service that does not easily cause congestion. Also, depending on the congestion level,
By restricting the transmission from a communication service that is likely to cause congestion, it is possible to avoid the deterioration of the congestion state of the communication network. When restricting the outgoing communication service according to the priority of the call based on the congestion level, the call type, the terminal class, etc., it is possible to finely regulate the outgoing call. There is an effect that the reduction can be minimized. Further, according to the present invention, there is an effect that communication of a call having a high priority can be secured even in a congested state.

[Brief description of the drawings]

FIG. 1 is a block diagram for explaining a first embodiment of the present invention.

FIG. 2 is a functional block diagram of the mobile terminal for explaining an operation of the first exemplary embodiment of the present invention.

FIG. 3 is a flowchart on the mobile terminal side for explaining the operation of the first exemplary embodiment of the present invention.

FIG. 4 is an explanatory diagram of the contents of a service restriction item storage memory shown in FIGS. 1 and 2;

FIG. 5 is a view for explaining a second embodiment of the present invention;
FIG. 3 is a functional block diagram of a base station.

6 is an explanatory diagram of the contents stored in a congestion level determination criterion storage memory of FIG. 5;

7 is an explanatory diagram of the contents stored in a call priority judgment criterion storage memory of FIG. 5;

FIG. 8 is a view for explaining a third embodiment of the present invention;
FIG. 3 is a functional block diagram of a base station.

FIG. 9 is a functional block diagram on a mobile terminal side for explaining a congestion control method of a conventional mobile communication system.

FIG. 10 is a flowchart for explaining the operation of the conventional mobile terminal shown in FIG.

[Explanation of symbols]

Reference Signs List 1 base station, 2 mobile terminal, 3 memory unit, 4 display unit, 5 transmission / reception unit, 6 judgment unit, 7 user I / F unit, 8
Mobile terminal control unit, 21 mobile terminal A, 22 mobile terminal B, 23 receiving unit, 24 transmitting unit, 25 mobile terminal information reading unit, 26 terminal information storing memory during call, 27 determining unit, 28 congestion level determination reference storing memory, 29 Call priority comparison reference memory, 30 Control information creation unit, 31
Transmitter

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04Q 7/04 DF term (Reference) 5K019 AA00 BA45 BA52 BA62 BB27 CD05 DA05 DC01 EA01 EA11 EA18 5K027 AA11 BB01 CC08 HH11 5K051 CC07 DD01 DD15 FF02 FF06 FF07 FF22 GG07 HH16 5K067 AA28 BB03 BB04 EE02 EE10 FF02 GG06 GG11 GG22 HH07 HH11 HH22 HH23

Claims (16)

[Claims] 1. A congestion control method in a mobile communication system in which one or more mobile terminals exist in a radio zone covered by a base station and the mobile terminals communicate with the base station or between the mobile terminals. The base station monitors a congestion state, notifies congestion information to the mobile terminal, the mobile terminal receives the congestion information from the base station, the congestion information, and a call A congestion control method in a mobile communication system, characterized in that at least a communication service type of a requested communication service is input and transmission is restricted based on a restriction standard of the communication service. 2. The congestion control method in a mobile communication system according to claim 1, wherein the congestion information is created based on a total number of the mobile terminals during communication or call setting processing. 3. A method for setting one or a plurality of deterioration determination thresholds, wherein each of the number of deterioration determinations in which the call blocking rate deteriorates below the deterioration determination threshold within a predetermined measurement time is within a predetermined upper limit during the predetermined determination period. The congestion control method in the mobile communication system according to claim 1, wherein the congestion information is created in accordance with the smallest degradation determination threshold value. 4. The mobile terminal in a mobile communication system in which one or more mobile terminals exist in a radio zone covered by a base station and the mobile terminal communicates with the base station or between the mobile terminals. A receiving means for receiving the congestion information from the base station; an input means for inputting a communication service type of a communication service for which a call is requested; and at least the congestion information and the communication service type as input conditions, and A mobile terminal, comprising: service restriction determining means for restricting transmission based on service restriction standards. 5. The mobile terminal according to claim 4, wherein a priority of a call is included in the input condition. 6. The mobile according to claim 5, wherein the priority of the call is determined based on a call type for which a call is requested and / or a terminal class of the mobile terminal. Terminal. 7. A service restriction item storage memory for storing a service type for which transmission is restricted and / or a service type for which transmission is not restricted, wherein the service restriction determination means is configured to:
The mobile terminal according to any one of claims 4 to 6, wherein transmission is restricted by reading the service restriction item storage memory. 8. The congestion information has a plurality of levels of congestion levels, and the service restriction determination unit restricts transmission from a communication service that is likely to cause congestion as the congestion level increases. The mobile terminal according to any one of claims 4 to 6, wherein 9. The congestion information has a plurality of congestion levels, and the service restriction judging means restricts the transmission of the call from a lower priority according to the higher the congestion level. The mobile terminal according to any one of claims 4 to 6, wherein: 10. The congestion information has a plurality of levels of congestion levels, and the service restriction determining unit increases the likelihood of congestion of the communication service as the congestion level increases,
The mobile terminal according to any one of claims 4 to 6, wherein outgoing call restriction is performed based on the priority of the call. 11. The congestion information has a plurality of levels of congestion, and the service restriction determination unit does not restrict transmission of a short message communication service regardless of the congestion level. The mobile terminal according to any one of claims 4 to 10. 12. The system according to claim 4, wherein the congestion information has a plurality of levels of congestion, and the service restriction determining unit restricts transmission of a voice communication service according to the congestion level. 12. The mobile terminal according to any one of claims 11 to 11. 13. The system according to claim 4, wherein the congestion information has a plurality of levels of congestion, and the service restriction determining unit restricts transmission of an image communication service according to the congestion level. 13. The mobile terminal according to any one of claims 12 to 12. 14. The wireless communication system according to claim 1, further comprising:
The above mobile terminal is present, a congestion control method in a mobile communication system in which the mobile terminal communicates with the base station or between the mobile terminals, wherein the base station monitors a congestion state When the mobile terminal makes a call, when the congestion state is equal to or higher than a predetermined level and the call priority of the called mobile terminal is higher than the call priority of the communicating mobile terminal, A congestion control method in a mobile communication system, comprising: forcibly cutting off communication of the mobile terminal in communication and allocating a communication channel to the calling mobile terminal. 15. The wireless communication system according to claim 1, wherein the base station covers one wireless zone.
A base station in a mobile communication system in which the above mobile terminal exists, wherein the mobile terminal communicates with the base station or between the mobile terminals, wherein a means for monitoring a congestion state; Receiving means for detecting an outgoing call;
Terminal information storage means, and second terminal information storage means for storing terminal information of the mobile terminal in communication, When the congestion state is a predetermined level or more, the first and second terminal information Determining means for comparing the call priority of the mobile terminal that is communicating with the mobile terminal that has detected the call based on the mobile terminal that is performing the call; Control means for forcibly cutting off communication of the communicating mobile terminal when the call priority is high, and allocating a communication channel to the mobile terminal in which the call is detected. Base station in a communication system. 16. The priority of the call is:
The base station in the mobile communication system according to claim 15, wherein the base station is determined based on a terminal class of the mobile terminal.