JP2002171569A - Digital mobile communication system and base station loopback communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem of a conventional base station loopback communication executed on the occurrence of a fault in a wireless channel controller or a transmission line interconnecting a wireless base station transmitter/receiver and the wireless channel controller that cannot have recognized the presence of a mobile station resident in the same area without calling the mobile station. SOLUTION: The wireless base station transmitter/receiver is provided with a call connection means that makes call connection to the mobile station, a fault supervisory means that can detect a fault in the wireless channel controller or a transmission line interconnecting the wireless channel controller and the wireless base station transmitter/receiver and a registration number management means that manages a registration number of the mobile station. The mobile station is provided with a means that stores a registration number about which the wireless base station transmitter/receiver informs the mobile station.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and more particularly to a configuration of a radio base station transmitting / receiving apparatus and a mobile station having a base station return communication function, and a base station return communication method.

[0002]

2. Description of the Related Art When a failure occurs in a radio channel controller or a transmission path between a radio channel controller and a radio base station transmitter / receiver, all mobile stations within the area of the affected radio base station transmitter / receiver communicate. Can not be done. Therefore,
The base station return communication function enables a call to be made again only to a mobile station existing in the zone of the wireless base station transmitting / receiving device.

For example, the present invention relates to a system in which communication between predetermined mobile stations can be performed when a failure occurs in a radio channel control device or when a transmission line interconnecting a radio channel control device and a radio base station transmission / reception device fails. JP-A-10-
Japanese Patent No. 13944 (Japanese Patent No. 2793566) discloses that a radio base station transmitting and receiving apparatus monitors a fault such as a radio channel control apparatus, a simple call connecting means for performing a call connection with a mobile station, and a call control. A storage unit for storing information, and transmission / reception control means for communicating with the mobile station, wherein the call control information stored in the storage unit when the failure monitoring means detects a failure of the radio circuit controller or the like. A system has been disclosed in which simple call control means controls the mobile stations existing in the zone of the radio base station transmitting / receiving apparatus based on the simple call control means.

Japanese Patent Laid-Open Publication No. 2000-209133 discloses a system in which, when performing base station return communication, a call connection can be made even when there is no available communication channel, a radio base station transmitting / receiving apparatus may have a fault. Monitoring means, simple call connection means for making a call connection with the mobile station, storage for storing call control information, and transmission / reception control means for communicating with the mobile station, and control channel communication of the transmission / reception control means A system is disclosed in which means communicates with mobile stations in a zone of a wireless base station transceiver using a control channel.

In the conventional base station loopback communication performed when a failure occurs in the radio network controller or when a transmission path interconnecting the radio network controller and the radio base station transmitter / receiver fails, the mobile stations are located in the same area. However, there is a problem that other mobile stations cannot be grasped. Therefore, for the time being, the mobile station calls the other party (cal).
l; outgoing call), but if the mobile station on the other end is not registered in the radio base station transmitting / receiving device, the call is disconnected.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to be carried out when a failure occurs in a transmission line interconnecting a radio channel controller or a radio base station transmitting / receiving device and a radio channel controller. At the time of base station return communication, the problem of not knowing the existence of a mobile station that wants to communicate in the same area unless a call is made is eliminated, and communication between mobile stations existing in the same area can be reliably guaranteed. An object of the present invention is to provide a digital mobile communication system, a radio base station transmitting / receiving device, a mobile station, and a base station return communication method.

[0007]

A digital mobile communication system according to the present invention, which provides means for solving the above-mentioned problems, comprises: a call connection means capable of making a call connection with a mobile station in a radio base station transmitting / receiving apparatus; A fault monitoring means for detecting a fault in a transmission line interconnecting the control device or the radio circuit controller and the radio base station transmitting / receiving device; and a registration number managing means for managing a registration number of the mobile station. The station includes a registration number storage unit that stores a mobile station registration number distributed from the wireless base station transmitting / receiving device.

A method according to the present invention is controlled by call control means of a radio channel control device connected to a radio base station transmission / reception device, and is connected to a mobile station via the radio base station transmission / reception device and the radio channel control device. The base station loopback communication method of the digital mobile communication system, in which the individual base stations perform individual communication, wherein the radio base station transmitting / receiving apparatus transmits a registration number of the mobile station by a position registration request transmitted from the mobile station during base station loopback communication. Registering and managing, and, during the base station return communication, informing the subordinate mobile station of the registration number of the mobile station in the wireless zone of the wireless base station transceiver registered in the wireless base station transceiver. And b.

[0009]

Embodiment of the embodiment of the present invention will be described with reference to the drawings in detail. FIG. 1 is a diagram showing a configuration of a digital mobile communication system according to one embodiment of the present invention. Referring to FIG. 1, a digital mobile communication system according to an embodiment of the present invention
, A radio channel controller 2, and a mobile station 3.

The radio base station transmitting / receiving apparatus 1 includes a fault monitoring unit 11, a simple call control unit 12, a storage unit 13 for storing call control information, a transmission / reception control unit 14, and a registration number management unit 15.

The radio line control device 2 includes a fault monitoring unit 21
And call control means 22.

The mobile station 3 has a registration number storage unit 31,
As will be described later, in the base station return communication, the registration numbers of the mobile stations in the same area, which are notified by the registration number management means 15, the simple call control means 12, and the transmission / reception control means 14 of the radio base station transmission / reception apparatus 1, are stored. The information is stored in the unit 31 so that the mobile station itself can know which mobile station is in the same area, and communication is established between specific mobile stations.

FIG. 2 is a flowchart for explaining the details of the processing operation of the embodiment of the present invention. 1 and 2
The operation of the embodiment of the present invention will be described with reference to FIG.

The fault monitoring means 11 performs fault monitoring of the radio channel control device 2 and the transmission line interconnecting the radio base station transmitting / receiving device 1 and the radio channel control device 2. The abnormality is notified to the means 12 (steps A-1 and A-2).

The simple call control means 12 includes the transmission / reception control means 1
4 is notified that all downlink communication (communication from the base station to the mobile station) has stopped. The transmission / reception control means 14 receiving this notification stops communication with all the mobile stations 3 in the area (step A-3).

The mobile station 3 determines that communication with the radio base station transmitting / receiving apparatus 1 has become impossible, and shifts to a perch channel (control channel) (CCH).

After notifying that all downlink communication has been stopped, the simple call control means 12 notifies the broadcast information stored in the storage unit 13 to the transmission / reception control means 14.

FIG. 3 is a diagram showing the contents of the broadcast information message. Message type, number of network number information octets,
Network number, rule information, control channel structure information, mobile station transmission power designation, standby permission level, standby degradation level,
It includes the number of perch channels for peripheral zone determination, the 1st to Mth perch channel numbers, base station information (normal / base station return), location registration timer, extended information element length, and extended information element. In FIG. 3, the information length is in octets.

The transmission / reception control means 14 of the radio base station transmission / reception apparatus 1 transmits control channel (CCH) broadcast information (base station return communication) to all mobile stations 3 in the area (step A-4).

The mobile station 3 determines the base station return communication based on the broadcast information, and when changing from the normal mode to the base station return communication mode, the mobile station 3
Send a location registration request.

When the transmission / reception control means 14 receives the location registration request, the simple call control means 12 acquires a registration number, which is an information element of the location registration request, and notifies the registration number management means 15.

The registration number management means 15 stores and manages the notified registration number of the mobile station 3 in the storage unit until the base station return communication ends. Also, the registration number management means 15
The mobile station 3 receives a location registration request from the transmission / reception control unit 1.
4, the signal is transmitted on the signal control channel (SCCH) (step A-5).

After notifying the broadcast information (registration number notification), the simple call control unit 12 notifies the transmission / reception control unit 14 of idle transmission, and the transmission / reception control unit 14 performs idle transmission (A-6).

In order to perform individual communication, the mobile station 3 selects one mobile station from the registration numbers of the mobile stations existing in the same area obtained from the broadcast information, and selects a control channel signal control channel (SCCH). Thus, the simplex call setting is transmitted to the wireless base station transmitting / receiving apparatus 1.

In the radio base station transmitting / receiving apparatus 1, when the transmission / reception control means 14 receives the simplex call setting from the mobile station 3, the simple call control means 12 sends the simple call control to the selected mobile station.
The transmission of the communication mode is notified to the transmission / reception control means 14 by the incoming control channel (PCH) of the control channel (step A-7). The communication mode is a message transmitted from the base station to the mobile station to notify the called side of the communication mode requested by the calling side.

The communication mode is transmitted from the transmission / reception control means 14 to the selected mobile station 3 (step A-8).

The mobile station 3 that has received the call transmits, to the radio base station transmitting / receiving apparatus 1, on the signal control channel (SCCH) that the communication is possible if the communication is possible. Whether communication is possible depends on the communication mode requested by the caller,
This is a message for reporting whether or not the receiving side can respond.

The simple call control means 12 determines the message indicating whether or not communication is possible, received by the transmission / reception control means 14, and if communication is possible, shifts to a communication channel (TCH) to perform individual communication between specific mobile stations shown in FIG. To start. If communication is not possible, the call number is released (step A-9).

When the simple call control means 12 determines the end of communication due to disconnection from the mobile station 3, the transmission / reception control means 14 performs idle transmission and broadcast information transmission.

Next, in one embodiment of the present invention, the operation of the mobile station (3 in FIG. 1) at the start of the base station return communication and the mobile station on the calling side and the called side of the individual communication (FIG. 1) 1 of 3)
A specific example of the operation will be described with reference to FIG. The PSC in FIG. 4 is a physical communication channel (Physical Service Channel).
ce Channel) and PCC are physical control channels (Physcic
al Control Channel).

When the base station return communication is started, if the downlink transmission from the wireless base station transmitting / receiving device (1 in FIG. 1) is stopped, the mobile station shifts to the control channel (B-).
1).

When the mobile station shifts to the control channel, it receives broadcast information (base station return). With this broadcast information, the mobile station starts operating in the base station return mode (B-2).

A position registration request is sent to the radio base station transmitting / receiving apparatus to notify the registration number of the signal to the signal control channel (S
CCH) (B-3).

When the location registration is completed by the radio base station transmitting / receiving device, the mobile station receives the transmitted location registration acceptance (B-4).

Thereafter, the mobile station acquires the registration numbers of all the mobile stations in the same area based on the broadcast information from the radio base station transmitting / receiving device. The mobile station enters the obtained registration number
Hold until the base station return communication is completed (B-
5).

The mobile station can realize individual communication by acquiring the registration number of another mobile station. Regarding this individual communication, the operation of the calling mobile station will be described first.

The mobile station on the calling side selects one specific mobile station from the stored registration numbers of other mobile stations in the area, and sets the simplex call setting using the signal control channel (SCCH) in the radio base station. It transmits to the station transmitting / receiving device 1 (B-6).

When the call setting is accepted by the radio base station transmitting / receiving device 1, a message of call setting acceptance is transmitted from the radio base station transmitting / receiving device. Upon receiving this message, the mobile station shifts to the communication channel (TCH) (B-7).

Next, the operation of the called mobile station will be described.

When the mobile station receives the simplex call setting from the calling side, the mobile station transmits / receives the incoming call control channel (P
CH) is received (B-8).

The mobile station that has received the communication mode determines whether communication is possible, and transmits the result to the radio base station transmitting / receiving apparatus on a signal control channel (SCCH) as a message indicating whether communication is possible (B-9).

When communication is possible, the call setting is transmitted from the radio base station transmitting / receiving apparatus on the signal control channel (SCCH), and the mobile station receiving the call setting shifts to the communication channel (TCH) (B-10).

[0043]

As described above, according to the present invention,
In a communication system including a wireless channel control device, a wireless base station transmitting / receiving device, and a mobile station, if base station return communication is performed due to a failure of the wireless channel control device or the like, it is difficult to simply communicate between mobile stations in the same area. In addition, it is possible to specify mobile stations existing in the same area, and to perform individual communication between the specified mobile stations.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a digital mobile communication system according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining an operation at the time of base station return communication in one embodiment of the present invention.

FIG. 3 is a diagram showing contents of a broadcast information message.

FIG. 4 is a sequence diagram showing a sequence flow among a calling mobile station, a called mobile station, and a base station in one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Radio | wireless base station transmission / reception apparatus 2 Radio | wireless line control apparatus 3 Mobile station 11 Fault monitoring means 12 Simple call control means 13 Storage part 14 Transmission / reception control means 15 Registration number management means 21 Fault monitoring means 22 Call control means 31 Registration number storage part

Continuation of the front page F term (reference) 5K067 AA33 DD57 EE02 EE10 EE16 EE22 FF03 FF18 HH23 JJ12 JJ13 JJ65 JJ69 KK15 LL01

Claims (11)

[Claims] 1. A digital communication system which is controlled by call control means of a radio channel control device connected to a radio base station transmission / reception device, and in which mobile stations communicate with each other via the radio base station transmission / reception device and the radio channel control device. In the mobile communication system, the radio base station transmitting / receiving apparatus includes means for managing a registration number of the mobile station by a position registration request transmitted from the mobile station at the time of base station return communication, the radio channel control apparatus, or The radio base station registered in the radio base station transmission / reception device during base station return communication when a failure occurs in a transmission path interconnecting the radio channel control device and the radio base station transmission / reception device. Register the registration number of the mobile station in the wireless zone of the transceiver
A digital mobile communication system, wherein the mobile station notifies the mobile station from the wireless base station transmitting / receiving device. 2. The mobile station communicates with the mobile station via the wireless base station transmitting / receiving device and the wireless channel control device under the control of call control means of the wireless channel control device connected to the wireless base station transmitting / receiving device. In the digital mobile communication system, the radio base station transmission / reception device monitors the radio channel control device, and a fault monitoring unit that monitors a transmission line interconnecting the radio channel control device and the radio base station transmission / reception device. Simple call control means for making a call connection with the mobile station, an information storage unit for storing call control information, transmission / reception control means for communicating with the mobile station, and transmission from the mobile station at the time of base station return communication. Registration number management means for managing the registration number of the mobile station in response to the received location registration request, and the radio channel controller, or the radio channel controller and the radio base station At the time of base station return communication when a failure occurs in a transmission path interconnecting with a receiving apparatus, the simple call control means and the registration number management means of the wireless base station transmitting / receiving apparatus use the wireless base station transmitting / receiving apparatus. The mobile station notifies the mobile station of the registration number of the mobile station in the wireless zone, and the mobile station acquires the registration number of the mobile station in the wireless zone, and performs individual communication between specific mobile stations in the wireless zone. A digital mobile communication system, characterized in that: 3. A registration number storage unit for storing a registration number of a mobile station broadcast from the radio base station transmitting / receiving apparatus, wherein the mobile station reports from the radio base station transmitting / receiving apparatus at the time of base station return communication. Means for registering the registration number of the mobile station in the same area to be registered in the registration number storage unit, so that it is possible to grasp which mobile station is in the same area on the mobile station. The digital mobile communication system according to claim 2, wherein 4. The mobile station receives broadcast information transmitted from the transmission / reception control means of the wireless base station transmitting / receiving apparatus, determines that the communication is a base station return communication based on the broadcast information, and switches the base station from a normal mode. When changing to the loopback communication mode, a location registration request is transmitted to the radio base station transmission / reception apparatus, and the transmission / reception control means of the radio base station transmission / reception apparatus receives a location registration request from the mobile station, The simple call control means obtains a registration number, which is an information element of the location registration request, and notifies the registration number to the registration number management means, and the registration number management means calculates the notified registration number of the mobile station. , While maintaining and managing until the base station loopback communication is completed, and accepting location registration for the mobile station by the transmission / reception control means using a signal control channel (SCCH). Digital mobile communication system according to claim 2 or 3, wherein the transmission to it. 5. In the mobile station, one mobile station is selected for performing individual communication from a registration number of a mobile station existing in the same area obtained from broadcast information from the radio base station transmitting / receiving apparatus. In this case, the mobile station transmits a simplex call setup to the radio base station transmitting / receiving apparatus by a signal control channel (SCCH) of a control channel, and the mobile station transmits / receives the simplex call setting to the radio base station transmitting / receiving apparatus using the mobile station. Upon receiving the simplex call setting from the station, the simple call control means notifies the selected mobile station of transmission of the communication mode to the transmission / reception control means via the incoming control channel (PCH) of the control channel. The called mobile station transmits, via a signal control channel (SCCH), communication enable / disable information for reporting whether or not the called side can cope with the communication mode requested by the calling side. The radio base station transmitting / receiving apparatus transmits the information to the base station transmitting / receiving apparatus. The wireless base station transmitting / receiving apparatus determines the communication availability information received by the transmission / reception control means by the simple call control means. If the mobile station can communicate, a communication channel (TCH )
5. The digital mobile communication system according to claim 4, wherein the process proceeds to step (2), and individual communication between specific mobile stations is started. 6. The wireless base station transmitting / receiving apparatus, wherein when the simple call control means determines that communication has ended due to disconnection from the mobile station, the transmission / reception control means performs idle transmission and broadcast information transmission. The digital mobile communication system according to claim 5, wherein 7. A mobile station communicates with the base station under control of a call control means of a radio channel controller connected to the radio base station transceiver, via the radio base station transceiver and the radio channel controller. A wireless base station transmitting / receiving apparatus for a digital mobile communication system, comprising: a registration number management unit for managing a registration number of a mobile station in response to a location registration request transmitted from the mobile station during base station return communication; The device, or during the base station return communication when a failure occurs in the transmission path interconnecting the radio channel controller and the radio base station transceiver, managed by the registration number management means, A wireless base station transmitting and receiving a registration number of a mobile station in a wireless zone of the wireless base station transmitting / receiving apparatus from the wireless base station transmitting / receiving apparatus to the mobile station. Communication apparatus. 8. A mobile station communicates with the mobile station via the wireless base station transmitting / receiving device and the wireless channel control device under the control of call control means of the wireless channel control device connected to the wireless base station transmitting / receiving device. In the wireless base station transmitting and receiving device of the digital mobile communication system, a failure monitoring unit that monitors a failure of the wireless channel control device and a transmission path interconnecting the wireless channel control device and the wireless base station transmitting and receiving device; A simple call control unit for making a call connection with a mobile station, an information storage unit for storing call control information, a transmission / reception control unit for communicating with the mobile station, and transmitted from the mobile station at the time of base station return communication. Registration number management means for managing a registration number of a mobile station in accordance with a position registration request, comprising: the radio network controller, or the radio network controller and the radio base station The mobile station in the wireless zone of the wireless base station transmitting and receiving apparatus is controlled by the simple call control means and the registration number managing means during the return communication of the base station when a failure occurs in the transmission path interconnecting the communication apparatuses. A wireless base station transmitting and receiving apparatus which performs control for notifying the mobile station of the registration number of the mobile station and enables individual communication between specific mobile stations in a wireless zone. 9. A mobile station controlled by call control means of a radio channel controller connected to a radio base station transmitter / receiver of a digital mobile communication system, via the radio base station transmitter / receiver and the radio channel controller. A mobile station that communicates with each other, comprising a registration number storage unit for storing a registration number broadcast from the wireless base station transmitting / receiving apparatus, and performing base station return communication, Means for transmitting a location registration request for a station, and during a base station return communication, receiving a registration number of a mobile station in the same area notified by broadcast information by the radio base station transmitting / receiving apparatus and storing the registration number in the registration number storage unit. Means, the mobile station can grasp which mobile station is in the same area, and the mobile station can perform individual communication with a specific mobile station in the same area. There is a capability, the mobile station, characterized in that. 10. A mobile station, which is controlled by call control means of a radio channel controller connected to a radio base station transceiver, performs individual communication between mobile stations via the radio base station transceiver and the radio channel controller. Performing the base station return communication method of the digital mobile communication system, wherein the radio base station transmitting / receiving apparatus registers and manages a registration number of the mobile station by a position registration request transmitted from the mobile station during base station return communication. And reporting the registration number of a mobile station in the wireless zone of the wireless base station transmitting / receiving device registered in the wireless base station transmitting / receiving device to a subordinate mobile station during the base station return communication. A base station return communication method, comprising: 11. The mobile station selects one mobile station for performing individual communication from a registration number of a mobile station existing in the same area obtained from broadcast information from the radio base station transmitting / receiving apparatus. Transmitting a simplex call setting to the radio base station transmitting / receiving apparatus by a signal control channel (SCCH) of a control channel, wherein the radio base station transmitting / receiving apparatus transmits a call from the mobile station on the calling side. Upon receiving the simplex call setting, transmitting the communication mode to the selected mobile station by using the incoming control channel (PCH) of the control channel. The called mobile station transmits the communication mode requested by the calling side. Transmitting communication enable / disable information for reporting whether or not the receiving side can respond to the wireless base station transmitting / receiving apparatus on a signal control channel (SCCH); In the line base station transmitting / receiving apparatus, based on the received communication availability information, if the called mobile station is communicable, the mobile station shifts to a communication channel (TCH) and individual communication between specific mobile stations is started. The base station return communication method according to claim 10, wherein: