JP2007036675A - Communication system and base station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology capable of surely confirming the location of a mobile station 100 in the case of a communication fault between a base station controller and a base station caused on a natural disaster or the like. <P>SOLUTION: A communication system 1 includes a plurality of mobile stations 100, a plurality of base stations 200, and the base station controller 300. Each base station 200 includes: a fault detection section 205 for detecting a communication fault between the base station controller 300 and the base station; a radio section 203 for transmitting emergency notice information to the mobile station 100 when the fault detection section 205 detects the communication fault; and a storage section 202 for storing mobile station identification information 202a transmitted from the mobile station 100. Each mobile station 100 includes a radio section 104 for transmitting the mobile station identification information 102a of the concerned mobile station 100 to the base station 200 when receiving the emergency notice information. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a communication system and a base station, and more particularly to a communication failure between a base station controller and a base station (for example, when a line between a base station controller and a base station is disconnected, The present invention relates to a communication system and a base station corresponding to a case where a station control device becomes inoperable due to a failure.

In a W-CDMA (Wideband CDMA) system, which is an example of a CDMA (Code Division Multiple Access) system, a communication system is configured by a mobile station, a base station, and a base station controller.
In general, the base station and the base station controller are connected by a wired line. In addition, the mobile station and the base station are connected by a wireless line. The base station performs data communication with a plurality of mobile stations via a radio line. The base station control device controls a plurality of base stations.

By the way, if the wired line between the base station controller and the base station is cut off due to a natural disaster such as an earthquake, fire or tsunami, or the base station controller becomes inoperable due to a failure, the base station The mobile station is not controlled at all by the base station control device, and voice communication and mail communication cannot be performed between the mobile stations.
Conventionally, for example, the following communication systems have been proposed for such problems. That is, the base station detects a communication failure with the base station control device, and broadcasts this communication failure information to each mobile station. Each mobile station switches the connection from the connected base station to another base station in which no communication failure has occurred based on the received communication failure information (for example, Patent Document 1).
JP 2000-278303 A (FIG. 1, paragraphs 0026 and 0027)

In recent years, mobile communication systems such as mobile phones have been used for disaster relief activities against natural disasters. That is, the mobile communication system is used for various disaster relief activities such as acquiring the location information of the mobile station from the mobile station identification information of the mobile station such as a mobile phone and confirming the location of the victim.
On the other hand, in the technique described in Patent Literature 1, after a communication failure occurs between the base station control device and the base station, the base station to which the mobile station switches and connects is located around the base station where the communication failure occurs. Since it is an existing base station, the base station that is the switching connection destination often causes a communication failure such as disconnection from the base station controller.
In this case, in the vicinity of the natural disaster, not only voice communication and mail communication cannot be performed between mobile stations, but also the location information of each mobile station cannot be obtained and the location of the victim is confirmed. Can not do it.

A communication system according to the present invention is a communication system having a plurality of mobile stations, a plurality of base stations connected to the plurality of mobile stations via radio channels, and a base station controller connected to the plurality of base stations. The base station detects a communication failure between the base station controller and the base station, and transmits emergency notification information to a plurality of mobile stations when the base station detection unit detects a communication failure. And a storage unit that stores identification information of the mobile station transmitted from the mobile station. When the mobile station receives the emergency notification information, the mobile station transmits the identification information of the mobile station to the base station. It has a transmission part to transmit.
With this configuration, when a communication failure occurs between the base station control device and the base station during a natural disaster or the like, the location of the mobile station can be reliably confirmed.

  According to the present invention, when a communication failure occurs between a base station control device and a base station during a natural disaster or the like, the location of the mobile station can be reliably confirmed.

Hereinafter, embodiments to which the present invention can be applied will be described.
The following description is for explaining the embodiment of the present invention, and the present invention is not limited to the following embodiment. Moreover, those skilled in the art can easily change, add, and convert each element of the following embodiments within the scope of the present invention.

A configuration of a communication system according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a communication system according to an embodiment of the present invention.
FIG. 2 is a diagram showing information stored in the storage unit of the base station according to the embodiment of the present invention.
As shown in FIG. 1, a communication system 1 according to an embodiment of the present invention includes a mobile station 100 such as a mobile phone, a plurality of base stations 200, and a plurality of base station controllers 300. Although not shown, the plurality of base station controllers 300 are connected to the core network side. In FIG. 1, only one mobile station 100 and one base station 200 are shown for convenience, but in reality, a plurality of mobile stations 100 and a plurality of base stations 200 are included in the communication system 1. ing.

The mobile station 100 is also called UE (User Equipment) and is wirelessly connected to the base station 200 to transmit and receive data.
The base station 200 is also called BTS (Base Transceiver Station), and may be called Node-B as a logical node. The base station 200 is connected to a plurality of mobile stations 100 via a radio line. Base station 200 performs data communication with a plurality of mobile stations 100.
The base station control device 300 is also called RNC (Radio Network Control) and is connected to the base station 200 through a wired line. The base station control device 300 controls the base station 200. The base station control device 300 has a control signal processing function and a maintenance / operation (O & M (Operations and Maintenance)) function, and performs circuit connection control of a radio line between the mobile stations 100 by being connected to the base station 200. . The plurality of base station control devices 300 are connected to the core network side via a wired line and are controlled by the core network side.

In general, in a W-CDMA communication system, the core network side (not shown) is the location of each mobile station 100 (for example, the cell number of each mobile station 100), that is, the communication area of which base station 200 each mobile station 100 is. It always recognizes whether it exists within.
Under the control of the base station controller 300, the base station 200 transmits / receives various information to / from each mobile station 100 existing in the communication area of each base station 200 using a plurality of channels.
In order for the core network side to recognize the location of each mobile station 100, the following processing is performed.

First, each of the plurality of base stations 200 broadcasts notification information to the plurality of mobile stations 100.
Note that a broadcast channel BCH (Broadcast Channel) is used for broadcast from the base station 200 to each mobile station 100.
Next, each of the plurality of mobile stations 100 receives mobile station identification information (for example, IMEI (international mobile equipment identifier) information) when the broadcast information (for example, cell number) from the base station 200 changes. ) To the base station 200.

A random access channel RACH (Random Access Channel) is used for transmission of mobile station identification information and a location registration request signal from the mobile station 100 to the base station 200.
The base station 200 transmits the mobile station identification information of the mobile station 100 and the location registration request signal to the core network side via the base station controller 300, and the core network side stores the mobile station identification information and the cell number of the mobile station 100. The position is registered in the unit (not shown). Thereby, the core network side can update and acquire the cell number of each mobile station 100.

Next, the internal configuration of the mobile station 100 will be specifically described.
As illustrated in FIG. 1, each mobile station 100 includes a control unit 101, a storage unit 102, an antenna 103, and a radio unit 104.
The control unit 101 is connected to the storage unit 102 and the radio unit 104, respectively, and controls the storage unit 102 and the radio unit 104 to control the entire mobile station 100.
The storage unit 102 stores mobile station identification information 102 a such as IMEI information unique to each mobile station 100.
The wireless unit 104 is connected to the antenna 103. Radio section 104 transmits and receives data to and from base station 200 via antenna 103 in accordance with instructions from control section 101. The radio unit 104, in particular, when a communication failure occurs between the base station control device 300 and the base station 200 and data communication with the base station control device 300 via the base station 100 is interrupted, Search for broadcast information. When the mobile station 100 receives other broadcast information, the mobile station 100 transmits the mobile station identification information 102a of the mobile station 100 to the transmission source base station 200. Note that the random access channel RACH is used for transmission at this time.

Next, the internal configuration of the base station 200 will be specifically described.
As illustrated in FIG. 1, each base station 200 includes a control unit 201, a storage unit 202, an antenna 203, a radio unit 204, and a failure detection unit 205.
The control unit 201 is connected to the storage unit 202, the radio unit 204, and the failure detection unit 205, and controls these units to control the entire base station 200.
The failure detection unit 205 detects a communication failure between the base station control device 300 and the base station 200. The communication failure includes, for example, when the wired connection between the base station control device 300 and the base station 200 is disconnected or when the base station control device 300 becomes inoperable.

The wireless unit 204 is connected to the antenna 203. The radio unit 204 transmits / receives data to / from the mobile station 100 via the antenna 203 in accordance with instructions from the control unit 201. When the failure detection unit 205 detects a communication failure, the wireless unit 204 transmits emergency notification information (for example, changes the cell number) to a plurality of mobile stations 100 existing in the communication area of each base station 200. To do. Note that the broadcast channel BCH is used for transmission at this time.
Furthermore, after the failure detection unit 205 detects a communication failure, the wireless unit 204 changes the contents of the emergency notification information at regular intervals, and a plurality of wireless stations 204 exist in the communication area of each base station 200. You may transmit to the mobile station 100.
The storage unit 202 stores mobile station identification information 202 a transmitted from the mobile station 100. For example, the storage unit 202 stores information shown in FIG. That is, mobile station identification information 202 a of a plurality of mobile stations 100 existing in the communicable area of the base station 200 is stored for each mobile station 100.

Next, operation | movement of the communication system 1 which concerns on embodiment of this invention is demonstrated based on figures.
FIG. 3 is a diagram showing an operation flow of the communication system according to the embodiment of the present invention.
Normally, in the communication system 1, the core network side (not shown) is the location of each mobile station 100 (for example, the cell number of each mobile station 100), that is, the communication area of which base station 200 each mobile station 100 is in. Always know if it exists.
The base station 200 transmits / receives various information to / from each mobile station 100 existing in the communication area of each base station 200 via the core network side using the plurality of channels. ing.

However, between the base station control device 300 and the base station 200, for example, the wired connection between the base station control device 300 and the base station 200 is disconnected or the base station control device 300 becomes inoperable. When a communication failure occurs, the core network side cannot recognize the cell number of each mobile station 100, and the base station 200 cannot receive control from the base station control device 300, and between each mobile station 100, Information communication cannot be performed.
As shown in FIGS. 1 and 3, when a communication failure occurs between the base station control device 300 and the base station 200 (step (hereinafter referred to as ST) 301), the failure detection unit of the base station 200 205 detects a communication failure with base station control apparatus 300 (ST302).

Next, radio section 204 of base station 200 transmits emergency notification information (for example, changing cell numbers) to a plurality of mobile stations 100 via antenna 203 in accordance with instructions from control section 201 (ST303). . In addition, preferably, emergency notification information is transmitted to a plurality of mobile stations 100, and communication failure information is transmitted to a plurality of mobile stations 100 (ST303). Furthermore, after the failure detection unit 205 detects a communication failure, the wireless unit 204 changes the contents of the emergency notification information at certain intervals and exists in the communication area of each base station 100. You may transmit to the several mobile station 100. FIG.
Next, the radio unit 104 of the mobile station 100 receives emergency notification information and communication failure information via the antenna 103. In addition, the mobile station 100 displays the content of the received emergency notification information and communication failure information on a display unit (not shown) according to an instruction from the control unit 101. At this time, the user of the mobile station 100 that has received the emergency notification information and the communication failure information confirms the display content on the display unit, so that there is a communication failure between the base station control device 300 and the base station 200. You can know what happened.

Next, the control unit 101 of the mobile station 100 extracts the mobile station identification information 102 a such as IMEI information from the storage unit 102 in response to the emergency notification information received from the base station 200. Next, radio section 104 of mobile station 100 transmits mobile station identification information 102a of mobile station 100 to base station 200 via antenna 103 in accordance with an instruction from control section 101 (ST304).
Next, radio section 204 of base station 200 receives mobile station identification information 102a via antenna 203 (ST305).

Next, storage section 202 of base station 200 stores mobile station identification information 202a for each mobile station 100 in accordance with instructions from control section 201 (ST306).
Thus, for example, in the event of a natural disaster, the content of the mobile station identification information 202a can be confirmed by taking out the storage unit 202 from the base station 200 and reading the storage content of the storage unit 202 with a personal computer or the like. it can.
Therefore, even if a communication failure occurs between the base station control device 300 and the base station 200 during a natural disaster or the like, the base station 200 can be retrieved by reading out the storage unit 202 and reading out the mobile station identification information 202a. The mobile stations 100 existing in the 200 communication areas can be identified.

  As described above, according to the present invention, when a communication failure occurs between the base station control device and the base station during a natural disaster or the like, the location of the mobile station can be reliably confirmed.

It is a figure which shows the structure of the communication system which concerns on embodiment of this invention. It is a figure which shows the information memorize | stored in the memory | storage part of the base station which concerns on embodiment of this invention. It is a figure which shows the operation | movement flow of the communication system which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication system 100 Mobile station 101 Control part 102 Storage part 102a Mobile station identification information 103 Antenna 104 Wireless part 200 Base station 201 Control part 202 Storage part 202a Mobile station identification information 203 Antenna 204 Radio part 205 Failure detection part 300 Base station control apparatus

Claims (7)

A communication system comprising a plurality of mobile stations, a plurality of base stations connected to the plurality of mobile stations by radio channels, and a base station controller connected to the plurality of base stations,
The base station
A detection unit for detecting a communication failure between the base station controller and the base station;
A radio unit for transmitting emergency notification information to the plurality of mobile stations when the detection unit of the base station detects the communication failure;
A storage unit for storing identification information of the mobile station transmitted from the mobile station,
The mobile station
A communication system having a transmission unit that transmits identification information of the mobile station to the base station when the emergency notification information is received.   2. The radio unit, when the detection unit of the base station detects the communication failure, transmits the communication failure information together with the emergency notification information to the plurality of mobile stations. The communication system according to 1.   The communication system according to claim 1, wherein the storage unit of the base station stores identification information of the mobile station transmitted from the mobile station.   The communication failure includes when the connection between the base station control device and the base station is disconnected or when the base station control device becomes inoperable. Communication system. A base station that is connected to a plurality of mobile stations via a radio channel and connected to a base station controller,
A detection unit for detecting a communication failure between the base station controller and the base station;
A radio unit for transmitting the emergency notification information to the plurality of mobile stations when the detection unit of the base station detects the communication failure;
A base station, comprising: a storage unit that stores identification information of the mobile station that the mobile station transmits to the base station when the mobile station receives the emergency notification information.   The base station according to claim 5, wherein the radio unit transmits the communication failure information to the plurality of mobile stations together with the emergency notification information when the detection unit detects the communication failure. Bureau.   6. The communication failure includes when the connection between the base station controller and the base station is disconnected or when the base station controller becomes inoperable. Base station.

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