JP2006210987A - Mobile communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the general calling system of a mobile communication system in which the load on a network can be lessened by preventing traffic from increasing. <P>SOLUTION: The mobile communication system comprises a mobile communication terminal 101, a plurality of wireless base stations 110-112 installed to perform wireless communication with the mobile communication terminal 101, an exchange 120 to which these wireless base stations 110-112 are connected, and a database 150 for storing the information about positional registration of the mobile communication terminal 101 connected with the exchange 120 wherein a general calling message from the exchange 120 is not transmitted to all wireless base stations 110-112S belonging to a calling area (PA) 160 but transmitted only to wireless base stations 110-112 where the mobile communication terminal 101 is waiting with high probability thus preventing increase in traffic and lessening the load on the network. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an exchange (hereinafter referred to as EX) in which a mobile communication terminal (hereinafter referred to as PS), a radio base station (hereinafter referred to as CS) and CS are connected, such as PHS (Personal Handyphone System). It is related with the mobile communication system comprised from these.

  2. Description of the Related Art Conventionally, in a cellular mobile communication system, a service area is divided into a large number of zones centering on a CS in order to share a radio frequency, which is a limited resource, with as many users as possible. By reducing the size of this zone, the PS in the zone can weaken the power of transmitted / received radio waves to such an extent that it can be transmitted / received to / from the CS installed in the zone. Can be the same frequency. In such a small zone configuration system, a method is proposed in which the location of the PS is registered, and only the CS corresponding to the location is called from the EX to the PS. This location registration is performed in units of a calling area (hereinafter referred to as PA) that covers a plurality of small zones.

  In such a mobile communication system, when there is an incoming call to a PS, the call to that PS, that is, the called PS is all from the EX, usually belonging to the PA where the called PS is registered. Call messages are sent to all CSs simultaneously. Therefore, a message is also transmitted to a CS that is not waiting for the called PS, and the amount of messages flowing in the network increases in proportion to the number of CSs belonging to the PA.

  In an area where many PS users temporarily gather, such as at event venues, there is a risk that the network will go down due to an enormous load of calls due to the concentration of users and increased communication opportunities.

  As a method for preventing this, there is a method of reducing the number of CSs belonging to the PA. However, if the number of CSs is reduced, the area per PA is reduced, so the number of PAs is increased and the traffic of location registration increases. End up. Since there is generally more location registration traffic than incoming traffic, it is difficult to reduce the load on the entire network even if the area of the PA is reduced.

  In order to reduce the network load of this simultaneous call, for example, a CS (hereinafter referred to as a representative CS) that can cover a plurality of call areas is prepared without requiring the CS of each PA to make a call. The line system is also known.

  In this method, a representative CS for calling is provided, but the representative CS needs to cover a plurality of PAs, so a CS with a large wireless output is required, and it is used for a system with a small wireless output such as PHS. Can not. In addition, in order to eliminate the call dead zone, for example, it is necessary to install a representative CS in the shadow of the building, and there is a problem that the effect of reducing traffic is reduced. is there.

In addition, an effect can be expected by increasing the number of PAs under the representative CS. However, for that purpose, it is necessary to reduce the area of each PA, and this increases the number of PAs. Will result in an increase.
JP 11-196465 A

  Therefore, an object of the present invention is to transmit traffic only to CSs having a high probability that the PS is waiting without transmitting a message of a general call from EX to all CSs belonging to the PA, thereby increasing traffic. An object of the present invention is to provide a mobile communication system capable of preventing and reducing the load on the network.

In order to solve the above problems, a mobile communication system of the present invention includes a mobile communication terminal, a plurality of radio base stations installed so as to perform radio communication with the mobile communication terminal, and these An exchange to which a radio base station is connected, and a database for storing information related to location registration of the mobile communication terminal connected to the exchange,
The mobile communication terminal searches for the radio base stations present in the vicinity, and creates a list of radio base stations that the mobile communication terminal can wait on the basis of the search results, and a radio base station search unit, A location registration processing unit that transmits the standby base station list information created by the radio base station search unit to the standby radio base station together with terminal ID information that identifies the mobile communication terminal;
The exchange receives the terminal ID information and the waiting list information via the radio base station, and together with these information, sends the exchange ID information for identifying the exchange to the database to register the location. And when there is an incoming call to the mobile communication terminal, the database is accessed, and a message for calling a plurality of receivable radio base stations registered in the stand-by base station list information of the mobile communication terminal And a call setting message processing unit for transmitting.

  In the mobile communication system of the present invention, the call setting message processing unit of the exchange is set in advance when there is no response from the mobile communication terminal that has received the incoming call within a preset time. The call setup message is retransmitted to all the radio base stations existing in the general call area.

  Furthermore, in the mobile communication system of the present invention, the mobile communication terminal also transmits the waiting list at the time of an incoming call operation or an outgoing call operation.

  Further, in the mobile communication system of the present invention, when the exchange receives the standby list, the location update in the database is updated based on the list.

  In order to solve the above problems, the mobile communication system of the present invention divides an area where communication service is possible into a plurality of calling areas, and when there is an incoming call to the mobile communication terminal, the mobile communication terminal A mobile communication system comprising a plurality of exchanges for transmitting a call setting message, which is a call message to the mobile communication terminal, to a plurality of radio base stations installed in a call area where the location is registered A database for receiving and storing information related to location registration of the mobile communication terminal via the radio base station and the exchange, and the mobile communication terminal searches for a radio base station capable of transmitting and receiving, and based on the search result, a reception level Create a stand-by list, which is information on the list of radio base stations that can stand by in order of the highest radio base station, and store this stand-by list A radio base station search unit; terminal ID information for identifying itself such as a telephone number to a radio base station having the highest reception level based on the standby list; and a location registration processing unit that transmits the standby list and registers its location. The exchange receives the terminal ID information and the standby list from the mobile terminal via the wireless base station, stores the terminal ID information and the standby list in an internal storage device, and A database registration processing unit for transmitting the ID information, the waiting list and the exchange ID information for identifying itself to the database and registering the location, and when there is an incoming call to the mobile communication terminal, the database is accessed. Queries the exchange where the mobile communication terminal of the plurality of exchanges is registered, and responds from the database. An exchange search processing unit for transmitting the call setting message to the exchange in which the mobile communication terminal is registered based on the exchange ID information, and the mobile communication stored in the internal storage device when the call setting message is received. And a call setting message processing unit for transmitting the call setting message to the corresponding radio base station based on a waiting list of the terminal.

As described above, according to the present invention, the call setup message is not transmitted to all CSs in the incoming PA, but only to the base station that is highly likely that the PS is waiting. Can be used to reduce the load on the network when an incoming call is received.

Further, since it is not necessary to reduce the PA in order to reduce the load at the time of incoming call, the traffic of location registration does not increase.

  Hereinafter, embodiments of the present invention will be described in detail. In the following embodiments, a PHS will be described as an example of a mobile communication system. FIG. 1 is a network configuration diagram showing an embodiment of the present invention.

  The network includes mobile communication terminals PS (101), PS (101), wireless base stations CS1 (110), CS2 (111), CS3 (112) and CS1 ( 101) etc. are connected, and EX1 (120), which is an exchange capable of transmitting and receiving with PS (101) via CS1 (101) etc., and the location registration information of PS (101) is sent to each CS such as CS1 (101) and EX1 It is comprised from DB (150) which is the database which receives via (120) and memorize | stores this location registration information.

  Further, as shown in FIG. 6, the EX1 has an internal storage device 121, a database registration processing unit 122, an exchange search processing unit 123, and a call setting message processing unit 124. The EX1 includes the EX1. It is assumed that information on the CS connected to (120) and the telephone line to which the CS is connected (for example, a correspondence table of CS-ID and telephone number which is ID information of CS) is stored in advance. .

  Here, CS1 to CS3 are CS belonging to the PA (106) which is the calling area of EX1.

  The EX1 (120) is also connected to the exchange EX2 (130) belonging to another network or the like. In this embodiment, EX2 (130) is an exchange for a wired telephone. The EX2 (130) is connected to a TEL (140) that is a wired telephone. Similarly to EX1 (120), EX2 (130) has an internal storage device 131, a database registration processing unit 132, an exchange search processing unit 133, and a call setting message processing unit 134 as shown in FIG. ing.

  Hereinafter, an operation based on each of these configurations will be described as a connection processing sequence.

  First, the operation at the time of PS (101) position registration will be described. As shown in FIG. 5, the PS (101) includes a radio base station search unit 102 and a location registration processing unit 103, and also includes a central processing unit (hereinafter referred to as CPU) (not shown). Based on a program stored in a predetermined storage device such as a ROM (Read Only Memory), control such as PS (101) location registration is executed. Similarly, CS1 (110), CS2 (111), CS3 (112), EX1 (120), EX2 (130), and DB (150) also have a CPU (not shown), and are stored in a predetermined storage device such as a ROM. Various controls are executed based on the stored program.

  The PS (101) is the power source of the PS (101) when the PS (101) moves from another PA to the PA (106) configured in the mobile communication system according to the present embodiment. The position is registered when is turned ON. The operation of each component at that time will be described below using the connection processing sequence of FIG.

  The PS (101) performs a location registration operation in the above case. First, the PS (101) first searches the neighboring CS by the radio base station search unit 102 (201).

  When a standby CS is found from the search result of the radio base station search unit 102, several stations and CS-ID information (for example, information such as CS-ID) for identifying the CS are included in descending order of reception level. ) Is used to create a stand-by CS list, which is list information of CSs that can be stand-by, and stored in the radio base station search unit 102 (202).

  In this case, if the reception level of the search for neighboring base stations is higher in the order of CS1 (110) and CS2 (111) and the radio wave of CS3 (112) cannot be received, PS (101) can stand by. A stand-by CS list having CS1 (110) as the first candidate of CS and CS2 (111) as the second candidate is created and stored in the radio base station search unit 102.

  Next, PS (101) performs a location registration operation on CS1 (110) having the highest reception level by location registration processing section 103. At this time, the location registration processing unit 103 simultaneously transmits PS-ID information (telephone number and the like) for specifying the PS (101) and the stored standby CS list (203).

  The CS1 (110) transmits the location registration information including the PS-ID information received from the PS (101) and the waiting list to the EX1 (120) (203). Here, when EX1 (120) receives location registration information from the database registration processing unit 122, the telephone number of PS (101) and the stand-by CS list transmitted at (204) are transferred to the internal storage device (121). Remember.

  Next, EX1 (120) transmits the location registration information and the exchange ID information for identifying itself to the DB (150) in the network by the database registration processing unit 122. (205) The DB (150) that has received the location registration information and the exchange ID information registers the location registration information and the exchange ID information in the database (206).

  When the registration of the location registration information is normally completed, the DB (150) transmits a location registration response (207) notifying that the registration of the location registration information is normally completed to the EX1 (120). Upon receiving this, EX1 (120) transmits a location registration response (208) to CS1 (110). CS1 (110) which received this transmits a location registration response to PS (101) (208).

  Next, the operation of each component when there is an incoming call to PS (101) will be described below using the connection processing sequence of FIG.

  The TEL (140) communicates with the PS (101), and since it makes a call to the PS (101) (the PS (101) side is an incoming call), the exchange to which the call setting message (301) is connected. Is transmitted to EX2 (130).

  The EX2 (130) acquires the information of the PS (101) that is the communication partner of the TEL (140) from the content of the call setting message, and where is the PA (106) where this PS (101) is registered. The exchange search processing unit 133 makes an inquiry to the DB (150) (302).

  The DB (150) returns the information of the PA (106) whose location is registered based on the exchange ID information corresponding to the location registration information of the PS (101) to the EX2 (130) (303).

  The exchange search processing unit 133 of the EX2 (130) receives the exchange ID information as a response from the DB (150), and the communication partner terminal PS (101) is registered in the PA (106) of the EX1 (120). The call setting message is transmitted to EX1 (120) (304).

  When the call setting message processing unit 124 of EX1 (120) receives the call setting message from EX2 (130), it extracts the telephone number of PS (101) from the message and uses the telephone number as a key to store the internal storage device. (121) is searched, and the standby CS list of PS (101) is searched. (305).

  Based on the search result, the call setting message processing unit 124 of EX1 (120) simultaneously transmits a call setting message to the base stations (CS1, CS2) that are likely to be waiting for the PS (101) ( 306) (307).

  In addition, the call setting message processing unit 124 of EX1 (120) uses a call setting reception waiting timer (not shown) simultaneously with the transmission of the call setting message (306) (307) in case the PS (101) does not respond. Then, a call setting reception waiting timer is started (316).

  The CS1 (110) and CS2 (112) having received the call setting from the EX1 (120) wirelessly transmit a message notifying the incoming call to the PS (101) (308) (309).

When receiving the incoming call message (309) from CS1 (110), PS (101) waiting in CS1 (110) transmits an incoming call response (310) to CS1 (110).

  When CS1 (110) receives an incoming call response from PS (101), CS1 (110) transmits a call setup message to PS (101) (311).

  The PS (101) that has received the call setup message (310) transmits a call setup acceptance message (312) to the CS1 (110). At this time, the CS information stored in the PS (101) is attached to the call setting acceptance message and transmitted.

  CS1 (110) transmits a call setting acceptance message to EX1 (120) (313).

  The EX1 (120) analyzes the CS information attached to the call setting acceptance message received from the CS1 (110), and updates the CS information stored in the internal storage device (121) (315).

  Thereafter, EX1 (120) transmits a call setting acceptance message to EX2 (130) (314). The EX2 (130) transmits a call setting acceptance message to the TEL (140) (315). Thereafter, the connection process proceeds according to the protocol.

  Next, the connection processing sequence of FIG. 4 (partly using FIG. 3) is used for the operation of each component when the PS (101) is waiting other than CS1 (110) due to the movement of the PS (101). Will be described below.

  When PS1 (101) moves to another location in the same PA (106) and is waiting for a CS (CS3 (112)) other than CS1 (110), the above method indicates that there is an incoming call. Cannot be sent to.

  In this case, since the call setting acceptance message (310) is not transmitted from the PS (101), the call setting acceptance waiting timer (started at 316) times out at EX1 (120).

  The call setup message processing unit 124 of the EX1 (120) transmits the incoming call to the CS3 (112) by retransmitting the call setup message to all CSs in the PA with this timeout. .

  The operation until the TEL (140) starts the call operation and the CS1 (110) and CS2 (111) transmit the incoming call message by radio is the same as “when there is an incoming call to the PS” (401 to 410). It is.

  Since PS (101) is waiting for CS3 (111), it is not known that an incoming call has been received at this time, and therefore no call setting acceptance message is transmitted to EX1 (120). Therefore, the call setting acceptance waiting timer times out (411).

  The call setup message processing unit 124 of EX1 (120) determines that there is a possibility that the PS (101) has moved due to this timeout, and call setup is performed for all CSs (CS1 to CS3) in the PA (106). A message is transmitted (412-414). At this time, in preparation for the case where the PS (101) is in a power-off state or in a place where radio waves do not reach, a call setting reception waiting timer is started (418).

  Upon receiving the call setup message from EX1 (120), CS3 (112) transmits the incoming call to PS (101) wirelessly (415).

  The PS (101) returns an incoming call response by an incoming message from the CS3 (112) and performs an incoming call operation (419 to 422).

  The EX1 (120) that has received the call setting acceptance message updates the CS information of the standby CS list of the PS (101) (423).

  In the PS (101), if the standby CS list in the PS (101) is updated when the PS (101) moves, the internal storage device (121) of the EX1 (120) is updated by the update operation (423) of the CS information. The PS (101) standby CS list is updated. That is, the waiting information is written in CS3 (112).

  The subsequent operations are the same as above (424 to 426).

  Next, the operation of PS when PS (101) moves will be described.

  When the CS that has been waiting for the PS (101) is changed to a CS other than the CS list that can be waited for in the PS (101), the radio base station search unit 102 can rewrite its own CS list for waiting. Do.

  As a result, the stand-by CS list in the PS (101) can always be updated with new information.

  Next, a method of efficiently communicating the standby CS list updated by the PS (101) to the CS or the like will be described. First, when the PS (101) makes a call, that is, when communicating with another PS, TEL (140) or the like, the call setting message is transmitted with the updated standby CS list attached.

  As a result, the EX1 (120) that has received the stand-by CS list together with the call setup message via the CS updates the internal storage device (121) during the call operation, thereby updating the information in the DB (150). It can always be new. Further, this operation can reduce the number of times of retransmission (call setting message transmission to all CSs) when there is no response from PS (101) in the incoming call operation.

  Next, the operation of each component when the PS (101) moves from one PA configured in the mobile communication system according to the present embodiment to another PA will be described. Since the movement of PS (101) cannot be detected by EX1 (120), the information of PS (101) may remain in the internal storage device (121) indefinitely. In order to prevent this, the lifetime of the information (expiration date) is provided in advance in the DB (150), and information exceeding this is deleted.

  However, for a PS that has not made or received a call for a long time, there may be a case where there is no information on the PS in the DB (150) when an incoming call is received. When there is no information on the PS in the DB (150), an incoming call setup message is transmitted to all CSs in the PA, thereby preventing an omission of incoming calls to the PS.

  In this case, since the CS information in the stand-by CS list is updated by the stand-by CS list update operation in the DB (150) when the call setup acceptance message is received, the incoming call according to the updated CS information is performed thereafter. The operation can be performed.

  In the above embodiment of the present invention, the case of the PHS system has been described. However, in the mobile communication other than the PHS, and in the communication system that performs the simultaneous call to the area where the called PS is registered in the incoming call. Can reduce the load at the time of incoming call by using the above invention.

  Further, as a modification of the present invention, in EX, the means for constantly monitoring traffic to and from the CS and selecting a CS with a small amount of traffic from the CS information stored in the EX when calling the PS , It is possible to avoid load concentration on a specific CS and to effectively use resources in the network.

  When people (PS) are temporarily concentrated, such as at an event venue, the system in the above example and multiple CSs with reduced output in the event venue can be prepared, even at PS in the same venue. Thus, it is possible to wait for different CSs, and load concentration on a specific CS can be avoided.

  Further, even in a system in which an extension switch and mobile communication are combined, the load on the extension switch and the network in incoming call processing can be reduced by adopting the method as in the above example.

  According to the mobile communication system according to the embodiment of the present invention configured as described above, it is possible that the PS waits without transmitting a call setting message for simultaneous call to all CSs in the PA at the time of the incoming call. Since a call setup message is transmitted only to a highly reliable base station, it is possible to reduce the load on the network when an incoming call is received. Further, since it is not necessary to reduce the PA in order to reduce the load at the time of incoming call, the traffic of location registration does not increase.

  Further, according to the mobile communication system of the present invention, when the call setting message processing unit of the exchange transmits the call setting message to the mobile communication terminal via the radio base station, the call setting message processing unit If the mobile communication terminal has not received an incoming call message indicating that it has received the call setup message via the radio base station that has transmitted the call setup message to The above effect can be obtained by retransmitting a call setup message for simultaneous calling to the radio base station.

It is a network block diagram showing the mobile communication system in one Example of this invention. It is a connection processing sequence showing the operation | movement of each structure at the time of the position registration of the mobile communication terminal in one Example of this invention. It is a connection processing sequence showing operation | movement of each structure when there exists an incoming call in the mobile communication terminal in one Example of this invention. It is a connection process sequence showing operation | movement of each structure when the mobile communication terminal in one Example of this invention is standing by other than the radio base station which carried out location registration previously. It is a figure showing the internal structure of the mobile communication terminal in one Example of this invention. It is a figure showing the internal structure of the exchange in one Example of this invention. It is a figure showing the internal structure of the exchange in one Example of this invention.

Explanation of symbols

101 ... Mobile communication terminal (PS)
110 to 112 ... Radio base station (CS)
120, 130 ... Exchange (EX)
140 ... Wired telephone (TEL)
150 ... Database (DB)
160 ... Call area (PA)

Claims (8)

A mobile communication terminal, a plurality of radio base stations installed so as to perform wireless communication between the mobile communication terminal, a switch to which these radio base stations are connected, and a switch connected to the switch A database for storing information related to location registration of the mobile communication terminal;
The mobile communication terminal searches for the radio base stations present in the vicinity, and creates a list of radio base stations that the mobile communication terminal can wait on the basis of the search results, and a radio base station search unit, A location registration processing unit that transmits the standby base station list information created by the radio base station search unit to the standby radio base station together with terminal ID information that identifies the mobile communication terminal;
The exchange receives the terminal ID information and the waiting list information via the radio base station, and together with these information, sends the exchange ID information for identifying the exchange to the database to register the location. And when there is an incoming call to the mobile communication terminal, the database is accessed, and a message for calling a plurality of receivable radio base stations registered in the stand-by base station list information of the mobile communication terminal A mobile communication system comprising: a call setting message processing unit for transmitting a message.   When there is no response from the mobile communication terminal that has received the incoming call within a preset time, the call setup message processing unit of the exchange exchanges all the radio bases present in the preset general call area. 2. The mobile communication system according to claim 1, wherein the call setup message is retransmitted to the station.   2. The mobile communication system according to claim 1, wherein the mobile communication terminal also transmits the waiting list at the time of an incoming call operation or an outgoing call operation.   4. The mobile communication system according to claim 3, wherein when said waiting list is received, said exchange updates location registration in said database based on the list. When a communication service area is divided into a plurality of simultaneous call areas and an incoming call is received by a mobile communication terminal, a plurality of radio base stations installed in the call area where the mobile communication terminal is registered A mobile communication system comprising a plurality of exchanges for transmitting a call setting message that is a call message to the mobile communication terminal,
A database for receiving and storing information related to location registration of the mobile communication terminal via the radio base station and the exchange;
The mobile communication terminal searches for a wireless base station that can transmit and receive, creates a standby list that is information on a list of wireless base stations that can wait in order of the wireless base station having the highest reception level based on the search result, A wireless base station search unit for storing a waiting list, and terminal ID information for identifying itself such as a telephone number and the waiting list to the wireless base station with the highest reception level based on the waiting list and the position registration by transmitting the waiting list. A location registration processing unit,
The exchange receives the terminal ID information and the waiting list from the mobile terminal via the wireless base station, stores the terminal ID information and the waiting list in an internal storage device, and stores the terminal ID information. And a database registration processing unit for transmitting and registering the exchange ID information for identifying the waiting list and self to the database, and the incoming call to the mobile communication terminal, the database is accessed and the plurality of exchanges are accessed. In this case, the exchange in which the mobile communication terminal is registered is referred to, and the call setup message is transmitted to the exchange in which the mobile communication terminal is registered based on the exchange ID information returned from the database. When the processing unit and the call setting message are received, the mobile communication terminal stored in the internal storage device Based on Chi receiving the ready list, the corresponding mobile communication system, characterized in that a call setup message processing unit which transmits the call setup message to the radio base station.   The call setting message processing unit of the exchange is configured to transmit the call setting message to the mobile communication terminal via the radio base station, and via the radio base station that has transmitted the call setting message within a preset time. When the mobile communication terminal does not receive an incoming call message indicating that it has received the call setup message, it retransmits the call setup message to all the radio base stations in the call area to which the mobile communication terminal belongs. 6. The mobile communication system according to claim 5, wherein   6. The mobile communication system according to claim 5, wherein the mobile communication terminal also transmits the waiting list at the time of an incoming call operation or an outgoing call operation.   8. The mobile communication system according to claim 7, wherein when the waiting list is received, the exchange updates the location registration in the database based on the list.

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