JP2008113179A - Digital radio communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital radio communication system wherein a radio terminal station can be easily connected to the digital radio communication system having a different system code by a simple operation. <P>SOLUTION: The digital radio communication system comprises a line controller, at least one base station connected with the line controller, and a plurality of terminal stations connected with the base station by a wireless circuit. The line controller is provided with a first control part and a first storage part, and a system code table wherein a first system code is recorded is provided in the first storage part. The terminal station is provided with a second control part and a second storage part. In the case that a second system code is recorded in the second storage part of at least one of the plurality of terminal stations, the first control part of the line controller adds the second system code to the system code table recorded in the first storage part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a digital wireless communication system, and more particularly to a digital wireless communication system that controls entry of wireless terminal stations having different system codes into a digital wireless communication system.

  As one of the digital radio communication systems in practical use, there is a digital radio communication system defined in the standard ARIB STD-T87 (Association of Radio Industries and Businesses-T87) “Airport MCA Digital Radio Communication System”. is there. This system, for example, provides multi-channel access (MCA) for airports that have an important mission of ensuring the safety of aircraft in the airport area and the comfort of users' activities at each airline. Access) wireless communication system. Such a system is installed at each airport. Furthermore, many systems such as disaster prevention radio, fire fighting / emergency radio, etc. are installed outside the airport. In the following description, digital wireless communication systems provided at different airports will be described for illustration, but the present invention is not limited to these.

  FIG. 9 is a block diagram showing a schematic configuration of an example of a digital wireless communication system provided at different airports, for example. In FIG. 9, reference numeral 901 denotes a line control device of a digital radio communication system installed at the airport A, and 902-1 and 902-2 denote radio base stations. In addition, when representing a radio base station, it is referred to as a radio base station 902. 903 indicates a communication area of the wireless base station 902-1, and 904-1,... 904-n indicate wireless terminal stations located in the communication area 903. In addition, when representing a wireless terminal station, it is referred to as a terminal station 904. The terminal station 904 includes a wireless device, a portable wireless device, an information terminal station, or the like mounted on a vehicle or the like.

  Similarly, 911 is a line control device of a digital radio communication system installed at Airport B, and 912-1 and 912-2 are radio base stations. In addition, when representing a radio base station, it is referred to as a radio base station 912. Reference numeral 913 denotes a communication area of the wireless base station 912-1, and reference numerals 914-1, ..., 914-x, 914-m denote wireless terminal stations located in the communication area 913. In addition, when representing a wireless terminal station, it is referred to as a terminal station 914. The terminal station 914 includes a radio device, a portable radio device, an information terminal station, or the like mounted on a vehicle or the like.

  The digital wireless communication system installed at the airport A is a communication connection for direct communication between each terminal station 904 and the base station 902-1 or between other base stations or between terminal stations via the base station or between the terminal stations. For example, a service or a communication connection service between a terminal station outside the communication area 903 and a terminal station in the communication area 903 is performed. The digital radio communication system installed at the airport B has substantially the same configuration as the digital radio communication system installed at the airport A.

  The line control devices 901 and 911 maintain and manage communication connections and service areas between the base stations 902 and 912 and the plurality of terminal stations 904 and 914 in the digital wireless communication system, and perform call control from the terminal stations. Alternatively, control for setting a communication route is performed. Note that the line control apparatuses 901 and 911 may be configured integrally with the base station 902 or the base station 912, or may be installed at a place distant from each other as shown in FIG. In this case, the line control devices 901 and 911 and the base stations 902 and 912 are generally connected by transmission lines 905 and 915 such as wired or micro lines. Further, in the above example, only two base stations are shown, but generally, a system composed of a plurality of base stations and a large number of terminal stations is common, but will be described with reference to FIG. 9 having a simple configuration. .

  FIG. 7 shows an example of radio carrier frequency allocation permitted for use in a digital radio communication system using the digital radio technology defined in the standard ARIB STD-T87. In FIG. 7, for example, in the uplink direction, that is, the direction from the terminal station to the base station, several tens of waves (f1, f2,...) Are recognized with a radio carrier f of 400 MHz band and a width of 25 KHz. In the downlink direction, that is, in the direction from the base station to the terminal station, a radio carrier F that is 44.5 MHz away from the radio carrier in the uplink direction and a width of 25 kHz and several tens of waves (F1, F2,...) Are recognized. It has been. Accordingly, in the communication of the digital wireless communication system, the frequencies in the upstream direction f1, f2,..., The downstream directions F1, F2,. Each system can use one or a plurality of radio carriers according to the scale.

  Further, according to the standard ARIB STD-T87, the terminal stations 904-1 located within the communication area 903 and the terminal stations located outside the communication area 903 can communicate directly between the terminal stations. A wireless carrier W is permitted. This wireless carrier W also has a bandwidth of 25 KHz, and a dozen waves (W1, W2,...) Are recognized. In the digital radio communication system shown in FIG. 9, the base station 902-1 uses, for example, uplink and downlink pair waves (f1, F1), (f2, F2), (f3, F3), and The base station 912-1 communicates using uplink and downlink pair waves (f5, F5), (f6, F6), and (fp, Fp).

  Further, each radio carrier is divided into frames as shown in FIG. 8, and after the frame is further divided into four slots, control channels C and communication channels S1, S2, S3,. Assigned. Such a communication system is a TDMA (Time Division Multiple Access) digital wireless communication system. Note that the communication channels S1, S2, S3,... S11 are referred to as communication channels S. Here, for example, one frame is 40 ms, and one slot is 10 ms. The control channel C is a channel that performs wireless line connection control and the like, and the communication channel S is a channel that performs telephone calls and data communication. In FIG. 8, for example, only the downlink directions F1, F2, and F3 of the uplink and downlink waves in the communication area 903 are illustrated.

  Now, an operation for the terminal station 904 belonging to the communication area 903 to perform communication will be briefly described. For example, a case where the terminal station 904-1 communicates with the terminal station 904-n will be described. The terminal stations 904-1 and 904-n first request location registration using the control channel C shown in FIG. 8 to the line control apparatus 901 via the base station 902-1. Receiving the location registration request, the line control apparatus 901 performs location registration of the terminal stations 904-1 and 904-n, and notifies the terminal stations 904-1 and 904-n of the result.

  Next, the terminal station 904-1 transmits a connection request signal to the line control apparatus 901 through the base station 902-1 using the control channel C shown in FIG. The line control device 901 that has received the connection request signal searches for an empty channel of the communication channel S shown in FIG. 8, and when there is an empty communication channel S, sends a connection permission signal to the terminal station 904-1 for the control channel C. Send using. At the same time, the control channel C is used to transmit a communication channel designation signal, for example, a communicable channel S1 to the terminal station 904-1 and the terminal station 904-n. Accordingly, the operators of the terminal station 904-1 and the terminal station 904-n can set the communication channel S1 and perform a voice call by the press talk method.

  Thus, in the digital wireless communication systems installed at the airports A and B described above, a system code specific to the system is set, and the system code is included in the notification information constantly notified from the base station. ing. For example, the system code of the digital wireless communication system installed at the airport A is “0001”, for example, and the system code of the digital wireless communication system installed at the airport B is “0010”, for example. It has established. This is shown in Table 1. In Table 1, the system code “0100” of the fire fighting / emergency system is also exemplified.

そして、Ａ空港に設置されているデジタル無線通信システムの通信エリア９０３に位置する端末局９０４は、Ａ空港に設置されているデジタル無線通信システムのシステムコード、例えば、“０００１”を記憶している。同様に、Ｂ空港に設置されているデジタル無線通信システムの通信エリア９１３に位置する端末局９１４は、Ｂ空港に設置されているデジタル無線通信システムのシステムコードは、例えば、“００１０”を記憶している。

The terminal station 904 located in the communication area 903 of the digital wireless communication system installed at the airport A stores a system code of the digital wireless communication system installed at the airport A, for example, “0001”. . Similarly, the terminal station 914 located in the communication area 913 of the digital radio communication system installed at the airport B stores, for example, “0010” as the system code of the digital radio communication system installed at the airport B. ing.

  A case where a terminal station having a different system code enters the digital wireless communication system in such a state will be described with reference to FIG. FIG. 10 shows a time sequence for explaining the operation of the digital radio communication system shown in FIG. 10, the same components as those in FIG. 9 are denoted by the same reference numerals. The operation when the terminal station 914-x of the digital wireless communication system installed at the airport B moves into the communication area 903 of the digital wireless communication system installed at the airport A will be described.

  First, the line control device 901 of the digital wireless communication system installed at the airport A periodically transmits notification information (also referred to as an empty line signal) to a terminal station 904 located in the communication area 903 ( Step 1001). This notification information includes the system code 1 (“0001”) for airport A. Each terminal station 904-1,... 904-n, 914-x compares the system code 1 in the received broadcast information with the system code owned by each terminal station (steps 1002, 1003, 1004). ). As a result of the comparison, the terminal stations 904-1,... 904-n have the same system code 1 (“0001”), but the system code 2 (“0010”) of the terminal station 914-x does not match ( Step 1005).

  In this state, the terminal station 904, for example, the terminal station 904-1 transmits the system code 1 (“0001”) and the location registration request to the line control apparatus 901 via the base station 902-1 (step 1006). The line control device 901 checks the system code 1 (“0001”) (step 1007), and the system code 1 (“0001”) matches, so the location registration is performed (step 1008). Then, a location registration notification is transmitted to the terminal station 904-1 via the base station 902-1 (step 1009). Accordingly, the terminal station 904-1 can perform an operation for a call. The same applies to the other terminal stations 904-2, ... 904-n.

  On the other hand, the terminal station 914-x transmits the system code 2 (“0010”) and the location registration request to the line control apparatus 901 via the base station 902-1 (step 1010). The line control device 901 checks the system code 2 (“0010”) transmitted from the terminal station 914-x (step 1011). As a result of the check, since the system code 2 (“0010”) does not match, the line control device 901 determines that the terminal station 914-x cannot enter the system (step 1012). Then, the line control device 901 notifies the terminal station 914-x that the system cannot be entered (step 1013).

  In such a case, as a method when the terminal station 914-x enters the digital wireless communication system at the airport A, for example, the terminal station 914-x that has received a notification that the system cannot be entered from the line control device 901 is provided inside. The held system code is changed (step 1014). Then, the terminal station 914-x again transmits the system code 1 (“0001”) and the location registration request to the line control apparatus 901 via the base station 902-1 (step 1015). The line control device 901 checks the system code 1 (“0001”) (step 1016), and since the system code 1 (“0001”) matches, the location registration is performed (step 1017). Then, the location registration notification is transmitted to the terminal station 914-x via the base station 902-1 (step 1018). As a result, the terminal station 914-x can perform an operation for a call.

  Although it is possible to enter a system with a different system code by changing the system code of the terminal station 914-x in this way, it is practically easy to change the system code of the terminal station 914-x. Absent. That is, the system code of the terminal station 914-x is written in advance by a personal computer or the like when a digital wireless communication system is constructed, or written in a ROM (Read Only Memory), and cannot be easily changed. If the change can be easily made, the terminal station may be abused due to theft or the like, and it is not possible to make a change easily to prevent this. However, it is desired to realize a digital radio communication system that can easily enter a digital radio communication system having a different system code by a simple operation at a terminal station that has undergone a predetermined procedure or an authorized terminal station.

JP 2006-74307 A ARIB STD-T87 “Airport Digital Mobile Communication System”, Japan Radio Industry Association

  It is desired to realize a digital radio communication system in which a terminal station that has undergone a predetermined procedure or an authorized terminal station can easily enter a digital radio communication system having different system codes with a simple operation.

  An object of the present invention is to provide a digital wireless communication system in which a terminal station can easily enter between different systems.

  Another object of the present invention is to provide a digital radio communication system with high security.

  Still another object of the present invention is to provide a digital wireless communication system in which a terminal station having a specific system code can enter a system having a different system code.

  The digital wireless communication system of the present invention includes a line control device, at least one base station coupled to the line control device, and a plurality of terminal stations connected to the base station through a wireless line, and the line control The apparatus has a first control unit and a first storage unit, has a system code table in which a first system code is recorded in the first storage unit, and the terminal station has a second control unit And the second storage unit, and when the second system code is recorded in the second storage unit of at least one of the plurality of terminal stations, the first of the line control device The control unit is configured to add the second system code to the system code table recorded in the first storage unit.

  In the digital wireless communication system of the present invention, when a terminal station having the second system code transmits a location registration request signal and the second system code to the line control device via the base station, The first control unit of the line control apparatus compares the system code table recorded in the first storage unit with the second system code transmitted from the terminal station, and determines the position based on the comparison result. A registration notification signal is configured to be transmitted to the terminal station.

  In the digital wireless communication system of the present invention, the first control unit of the line control device transmits the broadcast information including the first system code and the second system code via the base station to the plurality of pieces of information. It is configured to transmit to the base station.

  As described above, according to the present invention, it is possible to realize a digital wireless communication system in which a terminal station can easily enter between different systems. In addition, a terminal station that has undergone a predetermined procedure or an authorized terminal station can easily enter a digital wireless communication system having a different system code with a simple operation, and an administrator can set information on the system code and Since it is possible to determine whether or not to enter the terminal station in the wireless communication system and to control the terminal station, it is possible to provide a highly secure digital wireless communication system.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram for explaining a schematic configuration of an embodiment of the present invention. In FIG. 1, 101 and 111 are line control apparatuses, 102 and 112 are radio base stations, and 103 and 113 are communication areas of the radio base stations 102 and 112, respectively. 104-n are wireless terminal stations, 114-1, ..., 114-x, 114-m are also wireless terminal stations. In addition, when representing a radio | wireless terminal station, it calls the terminal stations 104 and 114. FIG. Further, the terminal stations 104 and 114 include a radio device, a portable radio device, an information terminal station, a mobile station, or the like mounted on a vehicle or the like. Reference numeral 105 denotes an operation management apparatus, and 106 and 115 denote transmission lines such as wired or micro lines for connecting the line control apparatuses 101 and 111 and the base stations 102 and 112. The digital radio communication system shown in FIG. 1 has the same configuration as that of the digital radio communication system shown in FIG. 9, but only one base station is shown in FIG. 1 for simplicity of explanation. . A system composed of the line control device 101, the base station 102, the operation management device 105, and the terminal station 104 represents a digital wireless communication system installed at the aforementioned airport A. The line control device 111, the base station 112 The system composed of the terminal station 114 represents a digital wireless communication system installed at the aforementioned airport B. The line control devices 101 and 111 are also connected to a wired terminal device (not shown).

  FIG. 2 is a block diagram illustrating specific configurations of the line control apparatus 101, the base station 102, and the operation management apparatus 105 illustrated in FIG. 1, and FIG. 3 is a block diagram illustrating specific configurations of the terminal stations 104 and 114. Indicates. In FIG. 2, 101 indicates a line control device, 102 indicates a base station, and 105 indicates an operation management device. The line control device 101 and the base station 102 are coupled by a transmission line 106 such as a wired or micro line. The line control apparatus 101 and the base station 102 can be configured integrally, but can also be provided separately as shown in FIG.

  The line control apparatus 101 includes a control unit 201, a storage unit 202, and an operation display unit 203. The base station 102 includes a transmission radio 204 that transmits a signal from the base station to the terminal station, for example, a radio carrier F1, and a reception radio 205 that receives a signal from the terminal station, for example, by the radio carrier f1. Has been. In FIG. 2, only the transmission radio 204 transmitted by the radio carrier F1 and the reception radio 205 receiving the signal from the terminal station by the radio carrier f1 are shown, but the signals are transmitted by the radio carriers F2 and F3. It goes without saying that a transmission radio (not shown) and a reception radio (not shown) for receiving signals from the terminal stations by radio carriers f2 and f3 are also provided.

  The line control apparatus 101 has a function of managing the channel usage status (communication channel usage status) of multi-channel access, a function of creating and transmitting control information to the base station 102, and control information received by the base station 102. Or a function for instructing the terminal station 104 of a used line (a communication channel to be used) by receiving or transmitting control information. In other words, the line control apparatus 101 maintains and manages the communication connection and the service area between the base station 102 and the plurality of terminal stations 104 in the digital wireless communication system, and performs call control from the terminal station or setting of a communication route. The control etc. which perform are performed.

  FIG. 3 is a block diagram showing a specific configuration of the terminal stations 104 and 114 shown in FIG. Note that the terminal station described here includes a mobile wireless device, a portable wireless device, an information terminal station, a mobile station, or the like mounted on a vehicle or the like. In FIG. 3, terminal stations 104 and 114 are wireless communication apparatuses that use a pair wave of an upstream radio carrier f1 and a downstream wireless carrier F1, for example, and can perform a voice call using the press talk method. Reference numeral 301 denotes an antenna for transmitting and receiving to and from the base station 102, 302 to a selector switch for transmitting and receiving to and from the base station 102, 303 to a receiving unit, 304 to a received signal processing unit, 305 to a speaker, 306 Is a control unit, 307 is a storage unit, 308 is a display unit, 309 is an operation unit, 310 is a microphone, 311 is a transmission signal processing unit, and 312 is a transmission unit. 2 and 3 will be described as a press-talk system, but a simultaneous transmission / reception system may also be used.

  Now, the operation of the digital radio communication system shown in FIG. 1 will be described with reference to FIG. 1 is similar to the digital wireless communication system shown in FIG. 9, the storage unit 202 of the line control devices 101 and 111 stores the system code “0001” of airport A and the system of airport B shown in Table 1, respectively. The code “0010” is stored. Further, the system unit “0001” shown in Table 2 is stored in the storage unit 307 of the terminal station 104-1,... 104-n, and the terminal stations 114-1,. The storage unit 307 stores the system code “0010” shown in Table 2.

そして、図１および図６では、Ａ空港に設置されているデジタル無線通信システム（システムコードは、“０００１”で示される。）の通信エリア１０３内にＢ空港に設置されているデジタル無線通信システム（システムコードは、“００１０”で示される。）の端末局１１４−ｘが持込まれた場合（または、新規参入の場合）について説明する。なお、本実施例では、１台の端末局１１４−ｘが持込まれた場合について説明するが、複数台が持込まれた場合も動作は同じである。

1 and 6, the digital radio communication system installed at the airport B in the communication area 103 of the digital radio communication system (system code is indicated by “0001”) installed at the airport A. The case where the terminal station 114-x (the system code is indicated by “0010”) is brought in (or a new entry) will be described. In addition, although a present Example demonstrates the case where one terminal station 114-x is brought in, operation | movement is the same also when a plurality of terminals are brought in.

  First, the line control apparatus 101 of the digital wireless communication system installed at the airport A periodically transmits notification information (also referred to as an empty line signal) to the terminal station 104-1 located in the communication area 103,. 104-n (step 601). The transmission timing of this notification information is shown in FIG. FIG. 12A shows periodic notification information I (1). Note that (1) schematically shows the system code 1 “0001” of the airport A included in the notification information.

  Transmission of the system code of the broadcast information will be described. The system code of the broadcast information is transmitted using, for example, the control channel C shown in FIG. The signal frame format of this control channel C is shown in FIG. In FIG. 4, symbols for each part are R: burst transient response guard time, P: preamble, CAC: control signal (including PCH, BCCH, and SCCH), PCH: general call channel, BCCH: broadcast channel, SCCH: individual Zone signaling channel, E: collision control bit, SW: synchronization word, CI: carrier information, CC: color code (interference countermeasure code), I: idle bit. The number represents the number of bits. The system code is transmitted as, for example, a code “0001” as shown in Table 1 using 4 bits of the control signal CAC.

  The terminal stations 104-1 to 104-n that have received the system code included in the broadcast information are compared with their own system codes stored in the storage unit 307 (steps 602 and 603). It confirms that it has done (steps 604 and 605).

  Next, the case where the terminal station 114-x having a different system code is brought into the communication area 103 of the digital wireless communication system installed at the airport A will be described. As described above, the terminal station 114-x stores the system code “0010” in the storage unit 307 of the terminal station 114-x. In this case, this is indicated by a new entry step 606 in FIG. As described above, when the terminal station 114-x having the system code “0010” is brought into the communication area 103 of the digital wireless communication system installed at the airport A (or in the case of new entry, etc.), normally, FIG. As explained in, you cannot make a call as it is. In one embodiment of the present invention, when the terminal station 114-x having the system code “0010” is brought in, it is assumed that a terminal station that has undergone a predetermined procedure or an authorized terminal station is brought in. The operation for such a case will be described below.

  First, in step 607 shown in FIG. 6, the system code table of the line control apparatus 101 is changed. That is, the system code table of the line control apparatus 101 before the change is the A airport system code “0001” shown in Table 1 as described above. Accordingly, the system code of the system code table of the line control apparatus 101 is changed. 2 is operated, for example, the authorized operator operates the operation display unit 206 of the operation management device 105 and stores the system code stored in the storage unit 202 of the line control device 101. The table is read, and as shown in Table 3, the system code “0010” is newly added to the system code “0001” of the A airport system.

このようにＡ空港システムコードを“０００１”、“００１０”とすることによってシステムコード“００１０”を有する端末局もＡ空港システムの通信エリア１０３内で通話を行うことが可能となる。

Thus, by setting the A airport system code to “0001” and “0010”, the terminal station having the system code “0010” can also make a call within the communication area 103 of the A airport system.

  An operation in which the terminal station 104-1 and the terminal station 114-x perform a call in such a state will be described. First, the line control apparatus 101 of the digital wireless communication system installed at the airport A periodically transmits notification information (also referred to as an empty line signal) in the communication area 103 as described above. ,..., 104-n and 114-x are transmitted (step 608). This notification information includes the system code 1 (“0001”) for airport A. The terminal station 114-x receives the notification information from the line control apparatus 101 and compares it with the system code 1 (“0001”) of the airport A (step 609). However, in the present embodiment, since the terminal station 114-x has the system code “0010”, the comparison result is a system code mismatch (step 610). Note that the terminal stations 104-1,... 104-n are the same as described in Steps 604 and 605, and thus the description thereof is omitted here.

  Next, the terminal station 104-1 transmits a system code 1 (“0001”) and a location registration request to the line control apparatus 101 via the base station 102 (step 611). The line control apparatus 101 checks the system code 1 (“0001”) (step 612), and since the system code 1 (“0001”) matches, the location registration is performed (step 613). Then, the location registration notification is transmitted to the terminal station 104-1 via the base station 102 (step 614).

  Similarly, the terminal station 114-x transmits a system code 2 (“0010”) and a location registration request to the line control apparatus 101 via the base station 102 (step 615). The terminal station 114-x is programmed to ignore the system code mismatch at step 610. The line control apparatus 101 checks the system code 2 (“0010”) from the terminal station 114-x (step 616). In this case, the line control apparatus 101 compares the system code table shown in Table 3 stored in the storage unit 202 with the system code 2 (“0010”), and therefore performs location registration (step 617). Then, the location registration notification is transmitted to the terminal station 114-x via the base station 102 (step 618).

  Next, a call operation when the terminal station 114-x and the terminal station 104-1 make a call will be briefly described. First, the terminal station 114-x transmits a connection request signal to the line control apparatus 101 via the base station 102 using the control channel C shown in FIG. The line control apparatus 101 that has received the connection request signal searches for an empty channel of the communication channel S shown in FIG. 8, and when there is an empty communication channel S, sends a connection permission signal to the terminal station 114-x as a control channel C. Send using. At the same time, the control channel C is used to transmit a communication channel designation signal, for example, the communicable channel S1, to the terminal station 114-x and the terminal station 104-1. Therefore, the operators of the terminal station 114-x and the terminal station 104-1 can set the communication channel S1 and perform a voice call by the press talk method. This call is performed using the communication channel S1 shown in FIG. 8 (step 619).

  The signal frame format of the communication channel S1 is shown in FIG. In FIG. 5, symbols of each part are R: burst transient response guard time, P: preamble, TCH: traffic channel, SW: synchronization word, CI: carrier information, CC: color code (interference countermeasure code), FACCH: high speed ACCH, SACCH: Low-speed ACCH, RCH: Housekeeping channel, B / I: Busy / Idle bit. The number represents the number of bits. For example, voice for a call is performed using the traffic channel TCH.

  Next, another embodiment of the present invention will be described using the time sequence shown in FIG. In the embodiment described above, a case has been described in which the broadcast information from the base station includes the system code 1 (“0001”), but in this embodiment, the system code 1 (“0001”) and the system code are included. A case where 2 (“0010”) is included will be described.

  First, in step 1101 shown in FIG. 11, the system code table of the line control apparatus 101 is changed. That is, the system code table of the line control apparatus 101 before the change is the A airport system code “0001” shown in Table 1 as described above. Accordingly, the system code of the system code table of the line control apparatus 101 is changed. 2 is operated, for example, the authorized operator operates the operation display unit 206 of the operation management device 105 and stores the system code stored in the storage unit 202 of the line control device 101. The table is read, and as shown in Table 3, the system code “0010” is newly added to the system code “0001” of the A airport system. The case where the terminal station 114-x enters (or newly enters) the communication area 103 of the A airport system will be described (step 1102). In the present embodiment, the case where one terminal station 114-x has entered will be described, but the operation is the same for a plurality of terminals.

  For example, the control unit 201 of the line control apparatus 101 transmits notification information to the terminal stations 104-1 ... 104-n and 114-x located in the communication area 103 of the A airport system via the base station 102. (Step 1103). This notification information (also referred to as a skyline signal) is shown in FIG. In FIG. 12B, broadcast information I (1) and broadcast information I (2) are alternately transmitted. (1) schematically represents the system code 1 (“0001”) included in the notification information I, and (2) schematically represents the system code 2 (“0010”) included in the notification information I. Yes. As described above, the broadcast information is constantly transmitted from the base station 102 at a predetermined cycle, but the system code 1 (“0001”) and the system code 2 (“0010”) are realized by alternately transmitting, for example. it can.

  The terminal stations 104-1 to 104-n that have received the notification information I (1) compare with the system codes that they own (steps 1104 and 1105). Here, since each system code of the terminal station 104-1,... 104-n is the system code 1 (“0001”), each terminal station 104-1,. A match is detected (steps 1107 and 1108).

  On the other hand, the terminal station 114-x that has received the broadcast information I (2) is also compared with the system code that it owns (step 1106). Here, the system code of the terminal station 114-x is the system code 2 (“0010”), but the broadcast code transmitted from the control unit 201 of the line control apparatus 101 via the base station 102 includes the system code. 2 (“0010”) is also included. Accordingly, the terminal station 114-x also detects a system code match (step 1109).

  Next, the terminal station 104-1 transmits a system code 1 (“0001”) and a location registration request to the line control apparatus 101 via the base station 102 (step 1110). The line control apparatus 101 checks the system code 1 (“0001”) in Table 3 stored in the storage unit 202 (step 1111), and since the system code 1 (“0001”) matches, the position registration is performed. (Step 1112). Then, the location registration notification is transmitted to the terminal station 104-1 via the base station 102 (step 1113).

  Similarly, the terminal station 114-x transmits a system code 2 (“0010”) and a location registration request to the line control apparatus 101 via the base station 102 (step 1114). The line control apparatus 101 compares the system code table shown in Table 3 stored in the storage unit 202 (step 1115), and the system code 2 (“0010”) matches. 1116). Then, the location registration notification is transmitted to the terminal station 114-x via the base station 102 (step 1117). Next, a call operation is performed in the same manner as in the above embodiment, and the terminal station 114-x and the terminal station 104-1 can make a call (step 1118).

  As described above in detail, even if a terminal station has a different system code by changing the system code table stored in the storage unit 202 of the line control apparatus 101 by an operation from the operation management apparatus 105, a predetermined system A call can be easily made within the communication area of a digital wireless communication system having a code. In addition, there is an advantage that the trouble of changing the system code of the terminal station can be saved. Of course, it goes without saying that the operator who operates the operation management apparatus from the viewpoint of security is an authorized administrator who can change the system code table stored in the storage unit 202 of the line control apparatus 101. Furthermore, since it is possible to enter a new system or enter a new system simply by changing the system code in this way, there is a feature that the terminal stations can be shared and the production cost can be reduced.

  Although the present invention has been described in detail above, the present invention is not limited to the embodiments of the digital radio communication system described herein, and can be widely applied to other digital radio communication systems. Needless to say.

The block diagram of schematic structure of one Example of this invention is shown. 1 is a block diagram of a schematic configuration of an operation management apparatus, a line control apparatus, and a radio base station used in an embodiment of the present invention. The block diagram of schematic structure of the terminal station used by one Example of this invention is shown. It is a figure which shows the flame | frame structure of the control channel used in one Example of this invention. It is a figure which shows the frame structure of the communication channel used in one Example of this invention. It is a figure which shows the time sequence for demonstrating operation | movement of this invention. It is a figure for demonstrating the relationship of the radio | wireless carrier frequency used with the conventional digital radio | wireless communications system. It is a figure for demonstrating the frame structure of the conventional digital radio | wireless communications system. The block diagram of schematic structure of the conventional digital radio | wireless communications system is shown. It is a figure which shows the time sequence for demonstrating operation | movement of the conventional digital radio | wireless communications system. It is a figure which shows the time sequence for demonstrating operation | movement of other one Example of this invention. It is a figure for demonstrating the alerting | reporting information used by this invention.

Explanation of symbols

  101, 111, 901, 911: Line control device, 102, 112, 902, 912: Wireless base station, 103, 113, 903, 913: Communication area, 104, 114, 904, 914: Terminal station, 105: Operation management Device, 106, 115, 905, 915: transmission path, 201, 306: control unit, 202, 307: storage unit, 203, 206: operation display unit, 204: transmission radio, 205: reception radio, 301 : Antenna, 302: changeover switch, 303: reception unit, 304: reception signal processing unit, 305: speaker, 308: display unit, 309: operation unit, 310: microphone, 311: transmission signal processing unit, 312: transmission unit.

Claims (1)

  A line control device, at least one base station coupled to the line control device, and a plurality of terminal stations connected to the base station by radio channels, the line control device comprising: a first control unit; A first storage unit, a system code table in which the first system code is recorded in the first storage unit, the terminal station having a second control unit and a second storage unit; When the second system code is recorded in the second storage unit of at least one terminal station among the plurality of terminal stations, the first control unit of the line control device uses the first storage unit. A digital wireless communication system, wherein the second system code is added to a system code table recorded in the section.

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