JP2005210148A - Emergency communication processing system and method in mobile communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile communication system in which connection to a particular telephone number on an emergency line or the like can surely be attained in as short a period of time as possible. <P>SOLUTION: A mobile station apparatus 1 simultaneously transmits a link channel establishment request signal to all communicatable base stations 2 in the case of establishing a link channel, and the base station apparatuses 2 receive the link channel establishment request signals which are simultaneously transmitted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mobile communication system such as a PHS (Personal Handyphone System) and a mobile phone system, and a mobile station apparatus, a base station apparatus, and a computer control method used therefor.

  In mobile communication systems such as PHS and mobile phone systems, mobile station devices such as PHS terminals and mobile phones generally communicate selectively with one of a plurality of base stations scattered in a service area. Is. That is, each base station covers areas that overlap each other, and communicates with mobile station apparatuses in each covered area.

  When a transmission operation is performed by the user of the mobile station apparatus, the mobile station apparatus normally sends a link channel establishment request to the waiting base station. The base station that has received the link channel establishment request checks whether or not the radio channel of the base station has a vacancy, and if there is a vacancy, returns a link channel assignment notification.

  On the other hand, if there is no free space, a link channel assignment rejection notification is returned. The mobile station apparatus that has received the link channel assignment refusal notification searches for another base station that can transmit and receive, and sends a link channel establishment request again to the found base station.

  The mobile station apparatus repeats the above procedure until it receives a link channel assignment notification from the base station. As a result, communication can be performed by effectively using the radio channel in the base station. In general, a limit on the number of retries is provided for the purpose of preventing an infinite loop.

In Patent Document 1, a line that is not assigned to a subscriber's call in a normal operation state is prepared, and a plurality of reserved radio channels used for an emergency call are provided, and the radio channel is congested. If a new call request is made by a subscriber, one of the reserved radio channels is assigned to the call, and if the call is an emergency call, the call is continued. In addition, an invention is disclosed in which communication of an emergency call is ensured by forcibly disconnecting a radio channel assigned to a non-emergency call out of calls currently in progress and releasing the disconnected radio channel. .
JP 2001-45554 A

  The conventional mobile communication system is problematic in the following cases. That is, when there is almost no free radio channel in the base station, there may be many retries, in which case it takes a long time to complete the transmission. Furthermore, due to the limitation of the number of retries, transmission may fail even though there is an empty channel in another base station.

  For example, when using the above standardized procedure in communication to an emergency line (the police, fire fighting, Japan Coast Guard, etc.), it is necessary to consider communication on the emergency line. Therefore, there is a problem that the transmission may take time or the transmission may fail even when there is a free line.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a mobile communication system that can connect to a specific telephone number such as an emergency line more reliably in as short a time as possible. .

  In the present invention for solving the problems of the conventional example, the mobile station apparatus transmits a link channel establishment request to all communicable base station apparatuses at the same time when a link channel is established (hereinafter referred to as a link channel establishment request). The link channel establishment request transmitted all at once is referred to as an all link channel establishment request), and the base station apparatus receives the all link channel establishment request.

  Further, at least one of the mobile station device, the base station device, and the database device existing in the communication network has means for storing an incoming telephone number that enables transmission of an all-link channel establishment request, and the mobile If at least one of the station apparatus, the base station apparatus, and the exchange existing in the communication network is a communication for the incoming telephone number, communication is not permitted if the communication is not for the incoming telephone number And means.

  The mobile station apparatus may transmit the all link channel establishment request using two or more time slots of the control channel.

  Furthermore, the mobile station apparatus may transmit the all link channel establishment request using at least one TDMA frame of a control channel.

  Moreover, the said mobile station apparatus is good also as selecting the base station apparatus which establishes a link channel based on predetermined conditions, when a link channel allocation notification is received from several base station apparatuses.

  Further, when the base station apparatus receives the all link channel establishment request, if the base station apparatus has a free voice channel, a link channel may be allocated.

  In addition, when the base station apparatus receives the all link channel establishment request, the link channel assignment rejection notification may not be transmitted if there is no free voice channel in the base station.

  Further, in the mobile communication method according to an aspect of the present invention, the mobile station device transmits an all link channel establishment request to all communicable base station devices when establishing a link channel; The base station apparatus receiving the all link channel establishment request.

  Embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the mobile communication system according to the present embodiment includes a mobile station device 1, a plurality of base station devices 2, and a communication network 3. The mobile station device 1 is usually within the area covered by the plurality of base station devices 2 and can communicate with the plurality of base station devices.

  As shown in FIG. 2, the mobile station device 1 includes a communication unit 11, a control unit 12, a storage unit 13, an operation unit 14, and a display unit 15. The communication unit 11 includes an antenna, receives signals from at least one base station arriving at the antenna, and outputs information on the reception strength to the control unit 12. The communication unit 11 modulates an audio signal or the like according to an instruction input from the control unit 12 and outputs it via an antenna, or receives and demodulates an audio signal or the like arriving at the antenna. It also performs processing related to normal calls and data communications, such as output to

  The control unit 12 controls each unit and executes processing related to a telephone call and data communication. Further, during the standby operation, the control unit 12 performs an operation (base station switching operation) for determining a base station to be a communication destination based on the received intensity information input from the communication unit 11, and at the time of transmission Controls the link channel establishment operation with the base station apparatus 2 as shown in the sequence diagram of FIG. Specifically, the control unit 12 outputs an instruction to the communication unit 11 to send a link channel establishment request to the base station device 2, and the communication unit 11 receives a link channel assignment notification from the base station device 2. First, communication with the base station is started. When the link channel assignment rejection notification is received, the communication unit 11 is instructed to send a link channel establishment request to another base station within a range where radio waves emitted from each other can be delivered. This sequence is the same as the conventional transmission sequence. The link channel establishment request 4 is assembled in the control unit 12, and as shown in FIG. 4, a value indicating a specific base station with which the mobile station device 1 is to communicate is set as the base station information 41. Further, when a predetermined condition is satisfied, when the link channel establishment request 4 is assembled, a value indicating that it is an all link channel establishment request is set as the base station information 41 by the control unit 12. This value can take any predetermined value.

  The storage unit 13 operates as a work memory for the control unit 12. In addition, the storage unit 13 holds programs and parameters related to each process performed by the control unit 12. The operation unit 14 is, for example, a numeric keypad, and receives a telephone number or character string input from a user and outputs it to the control unit 12. The display unit 15 displays and outputs information according to a signal input from the control unit 12.

  Here, a predetermined condition when the control unit 12 sets a value indicating that it is an all link channel establishment request as the base station information 41 included in the link channel establishment request 4 will be described. For example, the storage unit 13 has a specific telephone number table shown in FIG. 10, and stores a specific telephone number that is an incoming telephone number that can transmit link channel establishment requests all at once. The control unit 12 compares the incoming telephone number input from the operation unit 14 with the incoming telephone number stored in the specific telephone number table when performing an operation related to outgoing call, and determines that it is the specific telephone number. In this case, when the link channel establishment request 4 is assembled, the base station information 41 can be set to a value indicating that it is an all link channel establishment request.

  In addition, when performing an operation related to outgoing calls, the control unit 12 stores an incoming phone number input from the operation unit 14 that is not a specific phone number stored in the storage unit 13 or stores anything in the storage unit 13. Even if not, when there is an additional instruction from the operation unit 14, when the link channel establishment request signal 4 is assembled, a value indicating that it is an all link channel establishment request is set as the base station information 41 You can also Specifically, a case where “**” is set at the beginning of the incoming telephone number input from the operation unit 14 or a case where a dedicated button is provided on the operation unit 14 and the button is pressed can be considered. .

  As illustrated in FIG. 3, the base station device 2 includes a wireless communication unit 21, a network interface unit 22, a control unit 23, and a storage unit 24. The wireless communication unit 21 includes an antenna, receives a link channel establishment request from at least one mobile station apparatus, and transmits a link channel allocation notification or a link channel allocation rejection notification according to an instruction input from the control unit 23 To do. Also, each of the audio signals and the like from at least one mobile station apparatus is received and demodulated and output to the control unit 23, or the audio signal and the like input from the control unit 23 according to an instruction input from the control unit 23 It also performs processing related to normal calls and data communications, such as modulation and output via an antenna.

  The control unit 23 controls each unit of the base station apparatus 2 and executes processing related to telephone calls and data communication. In particular, at the time of transmission from the mobile station apparatus 1, the control unit 23 sends an empty voice to its own base station when the received link channel establishment request includes a value indicating that the link channel establishment request is for a specific base station. When there is a channel, a link channel assignment notification is returned, and when there is no free voice channel, an instruction to the wireless communication unit 21 is output so that a link channel assignment rejection notification is transmitted. Even when a value indicating that all link channels are established is included, a link channel assignment notification is returned if there is a free voice channel in the own base station, and a link channel assignment is rejected if there is no free voice channel. An instruction to the wireless communication unit 21 is output so as to transmit the notification.

  Here, when the signal from the wireless communication unit 21 includes a value indicating that it is an all-link channel establishment request, if there is no free voice channel in the own base station, a link channel assignment rejection notification is not transmitted. An instruction to the wireless communication unit 21 may be given. FIG. 9 shows a link channel establishment sequence in the case where the link channel establishment request 4 includes a value indicating that it is an all link channel establishment request. In this way, it is possible to avoid control channel congestion that is expected when a large number of mobile station apparatuses transmit all link channel establishment requests all at once.

  Further, in the link channel establishment sequence in the case where the link channel establishment request 4 includes a value indicating that it is an all link channel establishment request, before determining whether the own base station has a free space, Even if it is determined whether the incoming telephone number included in the request or the signal received before or after that is the specific telephone number stored in the storage unit 24 as the specific telephone number table shown in FIG. Good. In this determination, when the incoming telephone number matches the specific telephone number stored in the storage unit 24, an operation is performed to determine whether or not there is a free channel in the own station. If they do not match, an instruction to the wireless communication unit 21 is output so as to transmit a link channel assignment refusal notification, or an instruction to disconnect the communication during the subsequent transmission sequence is output. By doing so, it becomes possible to reject the request for establishment of all link channels transmitted from the mobile station apparatus to a telephone number other than the specific telephone number.

  Note that the table of FIG. 10 may be stored in the database device 31 that exists in the communication network 3. In this case, the means for confirming whether or not the communication is for the incoming telephone number refers to the database device when confirming. In addition, the exchange 32 existing in the communication network 3 may include a means for confirming whether or not the communication is for the incoming telephone number and a means for not permitting communication if the communication is not for the incoming telephone number.

  Communication between the communication unit 11 of the mobile station apparatus 1 and the radio communication unit 21 of the base station apparatus 2 is performed using a control channel. For example, in the case of PHS, as shown in FIG. 5, the control channel is multiplexed by TDMA (Time Division Multiple Access), and the base station apparatus 2 uses any one of the four time slots. Then, communication with the mobile station apparatus 1 is performed. Normally, when the mobile station apparatus 1 sends a link channel establishment request using only the time slot used by the base station apparatus 2 that is waiting, and receives a link channel allocation rejection notification in response to the request, The link channel establishment request is transmitted to the other base station 2 using only the time slot used by the other base station apparatus 2.

  For this reason, when the mobile station apparatus transmits an all link channel establishment request to the base station, it is efficient to issue an all link channel establishment request using two or more time slots of the control channel. . The use of two or more time slots does not need to be used in one TDMA frame, and can be divided into several TDMA frames and transmitted.

  An example of transmission in one TDMA frame is shown in FIG. 6A, and examples of transmission divided into several TDMA frames are shown in FIGS. 6B and 6C. In FIG. 6B, in the first TDMA frame, an all-link channel establishment request is sent in an even-numbered time slot, and in the second TDMA frame, an all-link channel establishment request is sent in an odd-numbered time slot. ing. In FIG. 6C, in the first TDMA frame, an all link channel establishment request is sent in the 0th time slot, and in the second TDMA frame, an all link channel establishment request is sent in the 1st time slot. In the same manner, all link channel establishment requests are sequentially sent.

  When transmitting all link channel establishment requests divided into several TDMA frames, a link channel assignment notification from the base station apparatus 2 may be received before transmission. In this case, the subsequent transmission of the link channel establishment request may be stopped or may be transmitted.

  The mobile station apparatus 1 can select a base station based on a predetermined condition when receiving a link channel assignment notification from a plurality of base stations.

  That is, for example, the communication unit 11 includes an antenna, receives signals from at least one base station arriving at the antenna, and outputs information on the respective reception strengths to the control unit 12. . As shown in FIG. 7, the control unit 12 stores the information on the reception strength in the storage unit 13 in association with the base station information, and has the strongest reception strength among the base stations that transmitted the link channel assignment notification. A base station can be selected and the subsequent transmission sequence can proceed to the base station.

  Since the present invention is applied when a link channel establishment request is transmitted, it is possible to assign a base station having an idle line not only at the time of transmission but also at the time of handover in the same procedure. By doing so, it is possible to prevent disconnection due to a shortage of free lines when a handover occurs while connecting to a specific telephone number such as an emergency line.

  Thus, according to the mobile communication system according to the present embodiment, it is possible to connect to a specific telephone number such as an emergency line more reliably in as short a time as possible.

1 is a configuration diagram of a mobile communication system according to an embodiment of the present invention. FIG. 2 is a configuration block diagram of a mobile station apparatus according to an embodiment of the present invention. It is a block diagram of the configuration of a base station apparatus according to an embodiment of the present invention. It is explanatory drawing which shows an example of the link channel establishment request | requirement which concerns on embodiment of this invention. It is explanatory drawing which shows the usage example of the radio | wireless line which concerns on embodiment of this invention. It is explanatory drawing which shows the usage example of the time slot of the control channel which concerns on embodiment of this invention. It is explanatory drawing which shows the example of the correspondence table of base station information and reception intensity which concerns on embodiment of this invention. It is a sequence diagram which shows the example of the process between the mobile station apparatus and base station apparatus which concern on embodiment of this invention. It is a sequence diagram which shows the example of the process between the mobile station apparatus and base station apparatus which concern on embodiment of this invention. It is explanatory drawing which shows the example of the specific telephone number table which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Mobile station apparatus, 2 Base station apparatus, 3 Communication network, 4 Link channel establishment request, 11 Communication part, 12, 23 Control part, 13, 24 Storage part, 14 Operation part, 15 Display part, 21 Wireless communication part, 22 Network interface unit, 31 database device, 32 exchange, 41 base station information.

Claims (12)

In a mobile communication system comprising a mobile station device, a base station device and a communication network,
The mobile station device transmits a link channel establishment request simultaneously to all communicable base station devices when establishing a link channel,
The base station device receives the link channel establishment request transmitted simultaneously;
A mobile communication system. The mobile communication system according to claim 1, further comprising:
When the base station apparatus receives the link channel establishment request transmitted all at once, if there is a free voice channel in its own base station, assign a link channel;
A mobile communication system. The mobile communication system according to claim 1, further comprising:
When the base station apparatus receives the link channel establishment request transmitted all at once, it does not transmit a link channel allocation refusal notification if there is no free voice channel in its own base station,
A mobile communication system. The mobile communication system according to claim 1, further comprising:
At least one of the mobile station device, the base station device, and a database device existing in a communication network is:
Means for storing an incoming telephone number that enables simultaneous transmission of link channel establishment requests;
At least one of the mobile station device, the base station device, and the exchange existing in the communication network is:
Means for determining whether the communication is for the incoming telephone number;
If the communication is not for the incoming telephone number, means for disallowing communication;
A mobile communication system characterized by comprising: Used in a mobile communication system consisting of a mobile station device and a base station device and a communication network
When a link channel is established, a link channel establishment request is transmitted to all the base station devices capable of communication at the same time.
A mobile station apparatus. The mobile station apparatus according to claim 5, further comprising:
The mobile station apparatus transmits the link channel establishment request all at once using two or more time slots of a control channel;
A mobile station apparatus characterized by the above. The mobile station apparatus according to claim 6, further comprising:
The mobile station apparatus transmits the link channel establishment request all at once using at least one TDMA frame of a control channel;
A mobile station apparatus characterized by the above. The mobile station apparatus according to claim 5, further comprising:
The mobile station device, when receiving a link channel assignment notification from a plurality of base station devices, selecting a base station device that establishes a link channel based on a predetermined condition;
A mobile station apparatus characterized by the above. Used in a mobile communication system consisting of a mobile station device, a base station device and a communication network,
Receive link channel establishment requests sent all at once,
A base station apparatus. The base station apparatus according to claim 9, further comprising:
When the base station apparatus receives the link channel establishment request transmitted all at once, if there is a free voice channel in its own base station, assign a link channel;
A base station apparatus characterized by the above. The base station apparatus according to claim 9 or 10, further comprising:
When the base station apparatus receives the link channel establishment request transmitted all at once, it does not transmit a link channel allocation refusal notification if there is no free voice channel in its own base station,
A base station apparatus characterized by the above. In a mobile communication method for controlling a mobile communication system comprising a mobile station device, a base station device and a communication network,
When the mobile station apparatus establishes a link channel, it transmits a link channel establishment request simultaneously to all communicable base station apparatuses;
The base station device receiving the link channel establishment request transmitted simultaneously;
A mobile communication method characterized by comprising:

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