JP5091649B2 - Digital radio system and short message transmission method in digital radio system - Google Patents

Description

  The present invention relates to a digital radio system and a short message transmission method in the digital radio system, and more particularly to a digital radio system having a dedicated channel communication function and a short message transmission method in the digital radio system.

  As one of the digital radio systems in practical use, for example, the standard ARIB STD-T79 (Association of Radio Industries and Businesses-T79) “Prefectural / Municipal Digital Mobile Communication System” or “Municipal Digital Mobile Communication” There is a digital radio system defined in “System”. FIG. 6 is a diagram illustrating an example of a digital wireless system including a plurality of base station zones. In FIG. 6, reference numeral 601 denotes a control station. The control station 601 includes, for example, a line control device 602, a control stand 603, and an operation management device 604. Reference numerals 605-1 to 605-m denote m base station radio apparatuses. In addition, when a base station radio | wireless apparatus is represented, it calls the base station radio | wireless apparatus or the base station 605. Reference numerals 606-1 to 606-m denote base station zones, that is, communication areas of the base station radio apparatus 605. In addition, when representing a base station zone, it is referred to as a base station zone or a communication area 606. In the base station zone 606 of the base station 605, n terminal stations (also referred to as mobile stations) 607-1, 607-2, ... 607-10, ... 607-51, ... 607-n. In addition, when representing a terminal station, it is called a terminal station 607. This digital radio system is a communication connection service for direct communication between base stations or between other base stations or between terminal stations via base stations, or between terminal stations outside the communication area 606 and in the communication area 606. The communication connection service with the other terminal stations is performed. Note that the terminal station 607 includes a mobile wireless device, a portable wireless device, an information terminal station, or the like mounted on a vehicle or the like.

  The line control device 602 has a function of managing the channel usage status (communication channel usage status) of the digital radio system, a function of creating and transmitting control information to the base station radio device 605, and a reception by the base station radio device 605. For example, a function of analyzing the received control information, or a function of instructing a used line (a communication channel to be used) to the terminal station 607 by receiving or transmitting the control information. In other words, the line control device 602 maintains and manages the communication connection and service area between the base station wireless device 605 and the plurality of terminal stations 607 in the digital wireless system, and performs call control or communication route from the terminal station. Performs control for setting. Note that the line control device 602 may be configured integrally with one of the base station wireless devices 605 or may be installed in a place distant from each other as shown in FIG. In this case, the line control device 602 and the base station 605 are generally connected by transmission lines 608-1,... 608-m, etc. such as a wired or micro line.

  The control table 603 includes an operation display unit (not shown), a microphone, and the like, and the operator operates the control table 603 to perform operations such as communicating with each terminal station and issuing an emergency instruction. .

  The operation management device 604 has a function for setting and maintaining basic management information of the digital wireless system, such as channel setting of the line control device 602, setting of a dedicated channel, system status confirmation, etc. The wireless system administrator is configured to operate.

  FIG. 7 shows an example of radio carrier frequency allocation that is permitted to be used in a digital radio system using the digital radio technology defined by the standard ARIB STD-T79. In FIG. 7, for example, in the uplink direction, that is, in the direction from the terminal station to the base station, a plurality of waves (f1, f2,...) Are recognized with a radio carrier f of about 260 MHz to 266 MHz and a width of 25 kHz. . Further, in the downstream direction, that is, in the direction from the base station to the terminal station, a radio carrier F of about 269 MHz to 275 MHz, which is 9 MHz away from 260 MHz in the upstream direction, has multiple frequencies (F1, F2,...) With a width of 25 kHz. It recognized. Therefore, in the communication of the digital wireless 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-T79, a wireless carrier is used so that a terminal station, for example, a terminal station located within the communication area 606 and a terminal station located outside the communication area 606 can directly communicate with each other. W is allowed. This wireless carrier W also has a bandwidth of 25 kHz, and a dozen waves (W1, W2,...) Are recognized. In the digital wireless system shown in FIG. 6, the base station 605-1 communicates using, for example, uplink and downlink pair waves (f1, F1).

  Further, each wireless carrier, for example, F1 and f1, is divided into frames as shown in FIG. 8, and after the frame is further divided into four slots, the control channel C and communication channels S1, S2, S3 are placed in the slots. Is assigned. Note that the communication channels S1, S2, and S3 are referred to as communication channels (or communication channels) S. Here, for example, one frame is 40 ms, and one slot is 10 ms. The control channel C is a channel for performing connection control of a wireless line, and the communication channel S is a channel for performing a telephone call and data communication. FIG. 8 shows an example, and the number of uplink and downlink pair waves, the number of control channels, the number of communication channels, and the like can be appropriately changed according to the scale of the system and the purpose of use.

  In the above-described digital wireless system, the base station 605, for example, the terminal stations 607-1, 607-2,... 607-10 in the communication area 606-1 of the base station 605-1, periodically receives location information. Is transmitted to the control station 601 through the base station 605-1. The control station 601 updates the position registration data owned by the control station 601 in the internal storage unit with the position information transmitted from the terminal stations 607-1, 607-2,... 607-10. The terminal station in the communication area 606-1 of the base station 605-1 is always monitored with the latest location registration data. The same applies to other base stations 605.

  Now, in such a digital radio system, for example, a disaster prevention system, a dedicated channel may be set for emergency communication, for example, emergency radio for a disaster prevention center or a fire department. For the setting of this dedicated channel, for example, one channel of the communication channel of the base station 605-1, for example, S1, is designated as a dedicated channel by the operation of the operation management apparatus 604. As described above, when the communication channel S1 of the base station 605-1 is set to the dedicated channel by the operation of the operation management apparatus 604, the base station 605-1 has the terminal stations 607-1 and 607- in the communication area 606-1. 2... 607-10 are notified of the dedicated channel setting to all the terminal stations, and the communication channel S1 of the line control device 602 is set to the dedicated channel.

  Accordingly, all the terminal stations of the terminal station 607 located in the communication area 606-1 recognize that the communication channel S1 is set as a dedicated channel. When using the dedicated channel, the operator of the terminal station 607 in the communication area 606-1 can make a call with another terminal station using the dedicated channel by an operation described later.

  Here, transmission / reception of a short message will be described. In a conventional digital wireless system, for example, in an emergency case, it is necessary for an administrator to send an urgent short message from a control stand or a terminal station. In this case, in the conventional digital radio system, it is normal to send a short message using the control channel C shown in FIG. In this case, the mobile station in the normal standby state can receive this short message because a call is not being made.

  However, in the digital wireless system in which the dedicated channel is set as described above, since the terminal station that is making a call using the dedicated channel is always in a call state, the setting of the call using the dedicated channel is not canceled. As long as this short message cannot be received, the reliability of the digital radio system is impaired. Therefore, it is desired to realize a digital wireless system that can receive a short message to all terminal stations in any state.

JP-A-2-192233

  In a digital wireless system in which a dedicated channel is set, a short message cannot be received unless the call setting using the dedicated channel is canceled, resulting in a loss of reliability of the digital wireless system.

  An object of the present invention is to provide a highly reliable digital radio system and a short message transmission method in the digital radio system.

  Another object of the present invention is to provide a digital radio system capable of transmitting / receiving a short message in a digital radio system in which a dedicated channel is set, and a short message transmission method in the digital radio system.

  The digital radio system of the present invention includes a control station, at least one base station coupled to the control station, and a plurality of terminal stations connected to the base station through a radio channel, and the control station includes at least A first control unit and a first storage unit, wherein the first control unit of the control station monitors a function of setting a dedicated channel as a communication channel of the wireless channel and a communication state of the dedicated channel; And a function of transmitting a short message to at least a predetermined number of terminal stations among the plurality of terminal stations, and a function of monitoring a communication state of the dedicated channel of a terminal station entering the dedicated channel When a non-call is detected, the first control unit is configured to transmit the short message to a terminal station that has joined the dedicated channel.

  In the digital wireless system of the present invention, a terminal that stores a plurality of the short messages in the first storage unit, selects a predetermined short message from the stored short messages, and enters the dedicated channel Configured to transmit to a station.

  In the digital wireless system of the present invention, the short message selected from the plurality of short messages is also transmitted to a terminal station other than the terminal station that has entered the dedicated channel.

  Further, the short message transmission method in the digital radio system of the present invention includes a control station, at least one base station coupled to the control station, and a digital terminal having a plurality of terminal stations connected to the base station by radio lines. In the communication system, the method includes a step of setting a dedicated channel in at least one of the communication channels of the wireless line, a step of monitoring a communication state of the dedicated channel, and a step of storing a short message, When a non-call is detected in the monitoring step, the method includes a step of transmitting the short message to a terminal station that has joined the dedicated channel.

  As described above, according to the present invention, since the short message transmission side can realize a wireless system capable of transmitting a short message even when the reception side is set to a dedicated channel, a highly reliable digital wireless system and digital wireless can be realized. There is a feature that can provide a short message transmission method in the system.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. Note that the digital wireless system to which the present invention is applied is substantially the same as the digital wireless system shown in FIG. FIG. 1 is a block diagram showing a specific configuration of a control station and a base station radio apparatus used in one embodiment of the present invention, and corresponds to the control station 601 and base station 605 of the digital radio system shown in FIG. To do. The base station 605 is shown as a representative.

  In FIG. 1, the control station 601 includes a line control device 602, a control table 603, and an operation management device 604. The line control device 602 includes a control unit 101 (also referred to as a first control unit) and a storage unit 102 (also referred to as a first storage unit), and the operation management device 604 includes an operation display unit 103. Have. The control unit 101 includes a monitoring unit 104 that monitors the transmission right request, acquisition status, or call status of each terminal station. Further, the base station 605 receives a signal from the base station to the terminal station 607, for example, a transmission radio 111 that transmits the signal from the radio carrier F1 and a signal from the terminal station 607, for example, a radio signal for reception received by the radio carrier f1. Machine 112. The control station 601 maintains and manages the communication connection and service area between the base station 605 and the plurality of terminal stations 607 in the digital wireless system, and performs control for making a call control from the terminal station or setting a communication route. .

  FIG. 2 is a block diagram showing a specific configuration of the terminal station 607 according to an embodiment of the present invention, and corresponds to the terminal station 607 of the digital radio system shown in FIG. Note that the terminal station 607 described here includes a mobile wireless device, a portable wireless device, a wired terminal station, an information terminal station, or the like mounted on a vehicle or the like. In FIG. 2, the terminal station 607 uses, for example, a pair wave of an uplink radio carrier f1 and a downlink radio carrier F1, and in individual communication (1: 1 communication), two-wave full duplex, group communication (1: n) shows a wireless communication apparatus using two-wave half-duplex press talk. Note that the two-wave half-duplex communication is a method in which a pair wave is used and bi-directional communication is possible using a single channel, but transmission and reception are not performed simultaneously. In this embodiment, the communication method using the press talk of the two-wave half-duplex communication will be described. However, the present invention is not limited to this, and needless to say, it can be applied to a full-duplex communication method.

  In FIG. 2, 201 is an antenna for transmitting and receiving with the base station 605, 202 is a changeover switch for transmitting and receiving with the base station 605, 203 is a receiving unit, 204 is a received signal processing unit, and 205 is A speaker 206 is a control unit (also referred to as a second control unit), 207 is a storage unit (also referred to as a second storage unit), 208 is a display unit, 209 is an operation unit, and 210 is a microphone. , 211 is a transmission signal processing unit, and 212 is a transmission unit.

  Here, the operation of the embodiment of the present invention will be described based on the operation sequence shown in FIG. In addition, the code | symbol of each part respond | corresponds to the code | symbol shown in FIG.1, FIG.2 and FIG.6. In FIG. 3, the base station 605-1 and the terminal stations 607-1, 607-2,... 607-10 use two-wave half-duplex communication pre-talk using uplink and downlink pair waves (f1, F1). Assume that you are talking. Then, a setting for performing communication by the selective call method using the normal channel, that is, the control channel C and the communication channel S, a dedicated channel is set as the communication channel S1, and a voice call method is set in the dedicated channel. A case of operating as a digital wireless system having settings for performing communication will be described.

  First, in the digital wireless system, the operator activates the system from the control table 603 (step 301), and the system operation is started. When each terminal station 607 turns on its own power (step 302), each terminal station 607 starts a control channel scan (step 303). This control channel scan searches for radio carriers F and f of the base station where the terminal station 607 is located. Then, for example, receivable F1 and f1 are determined, and a location registration request signal is transmitted to the line control device 602 via the base station 605-1 using the control channel (step 304).

  The line control device 602 that has received the location registration request signal updates the location registration information already stored in the storage unit 102 (step 305). In step 305, in the case of a location registration request from a new terminal station 607 that has not yet been registered, new registration is performed. Therefore, the update of the location registration information in step 305 includes new registration of the new terminal station 607.

  The line control device 602 that updated the location registration information in step 305 sends a location registration completion notification to each terminal station 607 (step 306). As a result, each terminal station 607 can communicate with another terminal station 607 or the control board 603 using the communication channel S. A so-called standby state is entered (step 307). The operations of the location registration request (step 304) and the location registration completion notification (step 306) are the same as those of the conventional digital wireless system, and thus detailed description thereof is omitted.

  Next, a case where a dedicated channel is set will be described. In order to set a dedicated channel, the administrator operates the operation display unit 103 of the operation management apparatus 604 and issues a dedicated channel setting command (step 308) to the base station 605-1 via the line control apparatus 602. The communication channel S1 is set as a dedicated channel (step 309). Then, the control unit 101 of the line control device 602 notifies each terminal station 607 via the base station 605-1 using the control channel C that the communication channel S1 is set as a dedicated channel (step 310). This will be described with reference to FIG. Whether a dedicated channel or a non-dedicated channel is set, a table as shown in Table 1 is created and stored in the storage unit 102 of the line control device 602 when the dedicated channel is set.

図９は、基地局６０５−１から端末局６０７の下り方向の制御チャネルのフレーム構成を示している。即ち、図８に示される下りＦ１の１フレームの内の制御チャネルＣの内容を示している。図９において、Ｒは、バースト過渡応答用ガード時間、Ｐは、プリアンブル、ＣＡＣは、制御信号（ＰＣＨ、ＢＣＣＨ、ＳＣＣＨを含む）、ＰＣＨは、一斉呼出チャネル、ＢＣＣＨは、報知チャネル、ＳＣＣＨは、個別ゾーン用シグナリングチャネル、Ｅは、衝突制御ビット、ＳＷは、同期ワード、ＣＩは、キャリア情報、ＣＣは、カラーコード（干渉対策コード）、Ｉは、アイドルビットをそれぞれ表し、それぞれの数字は、ビットを表し、合計３２０ビットで構成されている。そして、上述のように通信チャネルＳ１を専用チャネルに設定したことを制御チャネルＣの、例えば、ＣＡＣ（制御信号）の一部のビットを用いて、例えば、コード“００００１”（通信チャネルＳ１を専用チャネルとするコード）を各端末局６０７に通知する。このコードは、前もって、回線制御装置６０２の記憶部１０２に表２のようなテーブルとして登録されている。また、同様に、各端末局６０７の記憶部２０７にも表２に示すテーブルが記憶されている。

FIG. 9 shows the frame structure of the downlink control channel from the base station 605-1 to the terminal station 607. That is, the content of the control channel C in one frame of the downlink F1 shown in FIG. 8 is shown. In FIG. 9, R is a burst transient response guard time, P is a preamble, CAC is a control signal (including PCH, BCCH, and SCCH), PCH is a general call channel, BCCH is a broadcast channel, and SCCH is Signaling channel for dedicated zone, E is collision control bit, SW is synchronization word, CI is carrier information, CC is color code (interference countermeasure code), I is an idle bit, It represents a bit and is composed of a total of 320 bits. Then, the fact that the communication channel S1 is set as a dedicated channel as described above, for example, by using some bits of the control channel C, for example, CAC (control signal), for example, code “00001” (dedicated communication channel S1 The terminal station 607 is notified of the channel code. This code is registered in advance as a table as shown in Table 2 in the storage unit 102 of the line control device 602. Similarly, the table shown in Table 2 is also stored in the storage unit 207 of each terminal station 607.

各端末局６０７では、このコード“００００１”を受信すると、専用チャネル通信情報確認を行う（ステップ３１１）。確認方法としては、例えば、各端末局６０７の表示部２０８に「通信チャネル１専用」と表示したり、あるいはスピーカ２０５から音で知らせる等の方法がある。これによって専用チャネル通信参入が可能となる（ステップ３１２）。このように通信チャネルＳ１が専用チャネルに設定されると、通信チャネルＳ１は、専用チャネル設定となり、通常の制御チャネルＣを用いて選択呼出方式にて通信を行うチャネルは、通信チャネルＳ１以外の通信チャネルＳ２およびＳ３を割当てるように回線制御装置６０２の制御部１０１は、動作する。

Upon receiving this code “00001”, each terminal station 607 confirms dedicated channel communication information (step 311). As a confirmation method, for example, there is a method of displaying “dedicated to communication channel 1” on the display unit 208 of each terminal station 607 or informing the speaker 205 with sound. This enables entry into dedicated channel communication (step 312). When the communication channel S1 is set as a dedicated channel in this way, the communication channel S1 is set as a dedicated channel, and channels other than the communication channel S1 are used for communication by the selective call method using the normal control channel C. The control unit 101 of the line control device 602 operates so as to allocate the channels S2 and S3.

  Next, the operation when making a call using the dedicated channel S1 will be described. First, when entering the dedicated channel, the terminal station 607 needs to switch to the communication channel S1 by operating its own terminal station. For example, FIG. 3 illustrates a case where the terminal stations 607-1 and 607-2 make a dedicated channel call. The operators of the terminal stations 607-1 and 607-2 operate the operation unit 209 (steps 313 and 314) to switch to the dedicated channel S1 (steps 315 and 316). As a result, the terminal stations 607-1 and 607-2 have entered the dedicated channel.

  Next, for example, the terminal station 607-1 operates, for example, a press talk switch of the operation unit 209 to transmit a transmission right request signal to the line control apparatus 602 via the base station 605-1 using the communication channel S1. (Step 317). The transmission right request signal will be described. FIG. 10A shows the contents of the uplink f1 communication channel S1 (dedicated channel) shown in FIG. In FIG. 10A, R is a burst transient response guard time, P is a preamble, TCH is a traffic channel, SW is a synchronization word, CI is carrier information, and CC is a color code (interference countermeasure code). , FACCH is a high-speed ACCH, SACCH is a low-speed ACCH, RCH is a housekeeping channel, G is a guard time, each number is a bit, and is composed of a total of 320 bits. The transmission right request signal uses, for example, a code “00100” (transmission right request signal) via the base station 605-1 using a part of bits of the TCH (traffic channel) of the communication channel S1, for example. Transmit to the line controller 602.

  When receiving the transmission right request signal (code “00100”) from the terminal station 607-1, the control unit 101 of the line control apparatus 602 uses the communication channel S1 to transmit the transmission right permission signal via the base station 605-1. It transmits to the terminal station 607-1 (step 318). This transmission right permission signal is, for example, the code “00101” shown in Table 2. This will be described with reference to FIG.

  FIG. 10B shows the frame configuration of the uplink f1 communication channel S1 (dedicated channel) shown in FIG. In FIG. 10B, a transmission right permission signal (code “00101”) is a code “00101” (transmission right permission signal) using a part of bits of the communication channel S1, for example, TCH (traffic channel). Is transmitted to the terminal station 607-1. Thereby, the terminal station 607-1 and the terminal station 607-2 can talk using the dedicated channel of the communication channel S1 (step 319). In addition, in the Example shown in FIG. 3, although the case where the terminal station 607-1 and the terminal station 607-2 entered a dedicated channel is shown, terminal stations 607 other than these terminal stations enter a dedicated channel You can also. And the terminal station 607 which has entered this dedicated channel can listen to the voice of the terminal station 607-1 which has all transmission rights.

  Now, a method for transmitting and receiving a short message in the digital wireless system operating as described above will be described. First, a short message will be described. As the short message described in the present embodiment, for example, a licensed common message defined in the standard ARIB STD-T79 is used. Table 3 shows a part of this licensed common message.

表３において、Ｎｏ．は、各定型分メッセージに付された固有の番号であり、定型分メッセージ内容は、送信するメッセージの内容を表している。そして、Ｎｏ．０からＮｏ．４９までの５０例については、標準規格ARIB STD-T79で定められており、Ｎｏ．５０以降については、免許人が独自に定義して使用することができるようになされている。なお、本実施例では、表３に示すメッセージ、即ち、ショートメッセージを使用する場合について説明するが、これに限定されるものではない。なお、上述の表３に示すショートメッセージは、例えば、統制局６０１の記憶部１０２あるいは端末局６０７の制御部２０６の記憶部２０７に表３に示すテーブルとして記憶されている。

In Table 3, no. Is a unique number assigned to each standard message, and the content of the standard message indicates the content of the message to be transmitted. And No. 0 to No. The 50 examples up to 49 are defined in the standard ARIB STD-T79. About 50 or later, the licensee can define and use it independently. In the present embodiment, the case where the message shown in Table 3, that is, a short message is used will be described. The short message shown in Table 3 is stored as a table shown in Table 3 in the storage unit 102 of the control station 601 or the storage unit 207 of the control unit 206 of the terminal station 607, for example.

  Now, terminal stations that have not entered the dedicated channel, for example, terminal stations 607-3,... 607-10 shown in FIG. 3, are in a communicable state (shown in step 307), that is, in a standby state. Therefore, by operating the control table 603 of the control station 601, a short message is normally sent from the control table 603 to the terminal station 607-3 via the base station 605-1 as communication between the control station 601 and the terminal station 607. • Can be sent to 607-10. Since this is the same as the conventional communication method, detailed description is omitted.

  Next, a case will be described in which a short message is transmitted to terminal stations that have entered the dedicated channel, for example, terminal stations 607-1 and 607-2 shown in FIG. First, the principle of the present invention will be described with reference to FIG. FIG. 4 is a diagram illustrating a communication state between the terminal station 607-1 and the terminal station 607-2 set to the dedicated channel. In FIG. 4, the hatched signal is the transmission signal ST or MT, and the white signal indicates the reception signal SR or MR. First, the terminal station 607-1 turns on the press talk switch (transmission state), and transmits the voice S1-T from the microphone 210, for example. This voice is received as the voice S1-R by the base station 605-1 via the dedicated channel S1, and then transmitted to the terminal station 607-2 as the voice S1-T and received as the voice S1-R. At this time, the press talk switch of the terminal station 607-2 is in the OFF state (reception state). In addition, transmission / reception voices S1-T and S1-R have a delay in the terminal station and base station, but are omitted because they are extremely small.

  Next, the terminal station 607-2 turns on the press talk switch (transmission state), and transmits the voice S2-T from the microphone 210. This voice is received as the voice S2-R by the base station 605-1 through the dedicated channel S1, and then transmitted to the terminal station 607-1 as the voice S2-T and received as the voice S2-R. At this time, the press talk switch of the terminal station 607-1 is in the OFF state (reception state). Similarly, the terminal station 607-1 turns on the press talk switch (transmission state), and transmits the voice S3-T from the microphone 210. This voice is received as the voice S3-R by the base station 605-1 via the dedicated channel S1, and then transmitted to the terminal station 607-2 as the voice S3-T and received as the voice S3-R. At this time, the press talk switch of the terminal station 607-2 is in the OFF state (reception state). Similarly, the terminal station 607-1 and the terminal station 607-2 communicate with each other by the press talk method using the dedicated channel S1. In addition, the figure which shows the communication state between the terminal station 607-1 and the terminal station 607-2 shown in FIG. 4 shows only an Example, and is not limited to this.

  Thus, as is apparent from FIG. 4, in the communication between the terminal station 607-1 and the terminal station 607-2, there is a period in which no terminal station is communicating. For example, the time when the terminal station 607-1 starts transmitting the voice S3-T from the time when the terminal station 607-2 finishes transmitting the voice S2-T (the time when the press talk switch is turned off) (the time when the terminal station 607-2 turns on the press talk switch) ) And a time interval T1. This T1 is required to be at least several hundred ms, for example, until the terminal station 607-1 acquires the transmission right and starts transmission. On the other hand, the signal length of the short message shown in Table 3 is 40 to 800 bits, that is, about 4 ms to 80 ms, and the short message can be sufficiently transmitted at the time interval T1. Accordingly, in FIG. 4, during this time interval T1, the short message M1-T can be transmitted from the base station 605-1 to the terminal stations 607-1 and 607-2 via the dedicated channel S1.

  Hereinafter, a method for sending the short message M1-T will be described in detail with reference to FIGS. In the description of FIG. 3 described above, it has been described in step 319 that the terminal station 607-1 and the terminal station 607-2 start communication. Therefore, here, a method of transmitting a short message in step 319 and subsequent steps will be described.

  First, the line control apparatus 602 has the monitoring unit 104 in the control unit 101, and constantly monitors the call state in the digital wireless system (step 320). Therefore, the call state of the dedicated channel S1 is also monitored. In this state, the terminal station 607-2 turns on the press talk switch (step 322), and the voice S2-T (shown in FIG. 4) is transmitted to the terminal station 607-1 using the dedicated channel S1 and the base station 605-1. (Step 323). Then, the terminal station 607-2 turns off the press talk switch (step 324). At this time, the press talk switch of the terminal station 607-1 remains OFF (receivable state) (step 321).

  When an operator or administrator of the digital wireless system needs to send a short message to each terminal station 607, the operator or administrator designates the short message by operating an operation display unit (not shown) of the control table 603. (Step 325). For example, as shown in Table 3. 1 Specify the short message “Urgent! Please contact me”. This short message is specified by, for example, reading the table of Table 3 stored in advance in the storage unit of the control table 603 and displaying it on the operation display unit of the control table 603, so that the operator or the administrator can easily short-circuit. You can know the contents of the message. In this embodiment, the short message is specified from the control table 603. However, the short message can be specified by operating the operation display unit 103 of the operation management apparatus 604.

  In this way, designation of the short message, that is, No. shown in Table 3 is performed. 1 When the short message “Immediately, please contact me” is designated, the line control device 602 displays No.1. 1 A short message “Immediately! Please contact me” is stored in another location (for example, a buffer memory) in the storage unit 102 of the line control device 602 and each terminal station 607, for example, a terminal station 607-3,. Transmission to 607-10 is performed by a conventionally known method. Accordingly, in the terminal stations 607-3,... 607-10, characters are displayed on the display unit 208 or output from the speaker 205 as sound.

  Next, the terminal stations 607-1 and 607-2 that have entered the dedicated channel S1 will be described. As described above, the line control apparatus 602 has the monitoring unit 104 in the control unit 101, and it has been described that the communication state in the digital wireless system is constantly monitored (step 320). Therefore, the monitoring unit 104 of the control unit 101 of the line control device 602 can detect that the dedicated channel S1 is not used, that is, is not in a call when the press talk switch of the terminal station 607-2 is turned off. (Step 326).

  When the control unit 101 of the line control device 602 detects this non-call, the short message previously stored in another location (for example, a buffer memory) of the storage unit 102 of the line control device 602, No. 1 shown in Table 3, is displayed. 1. Read “Immediately! Please contact me” and send a short message from the base station 605-1 to the terminal stations 607-1 and 607-2 using the dedicated channel S1 (step 327).

  The sending method will be described with reference to FIG. FIG. 5 shows a format of a signal transmitted from the base station 605-1 of the dedicated channel S1 to the terminal stations 607-1 and 607-2. In FIG. 5, R is a burst transient response guard time, P is a preamble, TCH is a traffic channel, SW is a synchronization word, CI is carrier information, CC is a color code (interference countermeasure code), and FACCH is , High-speed ACCH and SACCH are low-speed ACCH and RCH are housekeeping channels, G is a guard time, and each number is a bit, and is composed of a total of 320 bits. And a short message: No. 1 “Immediately please contact me” is transmitted using bits of the octet 1 (message type indicated by 501 in FIG. 5) of a part of the communication channel S1, for example, TCH (traffic channel).

  Short message from base station 605-1: No. 1 The terminal stations 607-1 and 607-2 that have received “Immediately! Please contact me” refer to the licenser common fixed message shown in Table 3 stored in the storage unit 207 of the control unit 206 and display it. The short message is displayed on the unit 208, or the short message is output by voice from the speaker 205. Then, the control unit 206 of the terminal stations 607-1 and 607-2 transmits a short message incoming response to the control table 603 via the base station 605-1 using the dedicated channel S1 (step 328).

  The control board 603 can confirm that the terminal stations 607-1 and 607-2 have received the short message by displaying the short message incoming response on the operation display unit.

  In this state, the terminal station 607-1 turns on the press talk switch (transmission state) (step 329), and transmits the voice S3-T (shown in FIG. 4) from the microphone 210. This voice is received as voice S3-R by the terminal station 607-2 via the dedicated channel S1 and the base station 605-1 (step 330). At this time, the press talk switch of the terminal station 607-2 is in the OFF state (reception state). Then, the terminal station 607-1 turns off the press talk switch (step 331) and ends the call. In steps 321 to 331 of the above-described embodiment, only a part of the explanatory diagram of the communication state shown in FIG. 4 is shown, and the processing steps such as the transmission right request of the terminal station 607 have been described above, and thus omitted. It is.

  When the control unit 101 of the line control device 602 detects a non-call and transmits a short message as described above, a terminal station that has entered the dedicated channel, for example, the terminal station 607-1, sometimes press talk switches. The case where ON is turned on occurs. In this case, since the information that the terminal station 607-1 has turned on the press talk switch can be detected by the control unit 101, it is determined whether priority is given to the short message or the voice call by turning on the press talk switch. be able to. For example, if the short message is set as the priority in the operation management apparatus 604 of the digital wireless system, the short message is transmitted with priority.

  Although the present invention has been described in detail above, the present invention is not limited to the embodiments of the digital radio system and the short message transmission method in the digital radio system described herein. Needless to say, the present invention can be widely applied to a short message transmission method in a digital wireless system.

The block diagram of schematic structure of the control station and base station radio | wireless apparatus used for this invention is shown. The block diagram of schematic structure of the terminal station used for this invention is shown. It is a figure which shows the operation | movement sequence for demonstrating operation | movement of one Example of this invention. It is a figure which shows the communication state between the terminal stations for demonstrating the principle of this invention. It is a figure which shows the signal format for demonstrating transmission of the short message of this invention. It is a figure which shows schematic structure of the conventional digital radio system. It is a figure which shows an example of the radio | wireless carrier frequency allocation with which use is permitted with the conventional digital radio system. It is a figure which shows the flame | frame structure used with the conventional digital radio system. It is a figure which shows the format structure of the control channel used in one Example of this invention. It is a figure which shows the format structure of the communication channel used in one Example of this invention.

Explanation of symbols

  101: control unit, 102, 207: storage unit, 103: operation display unit, 104: monitoring unit, 111: transmission radio, 112: reception radio, 201: antenna, 202: changeover switch, 203: reception unit 204: reception signal processing unit, 205: speaker, 206: control unit, 208: display unit, 209: operation unit, 210: microphone, 211: transmission signal processing unit, 212: transmission unit, 601: control station, 602: Line control device, 603: control table, 604: operation management device, 605: base station radio device, 606: communication area, 607: terminal station.

Claims (2)

A control station, at least one base station coupled to the control station, and a plurality of terminal stations connected to the base station via a radio channel, and a communication channel of the radio channel between the plurality of terminal stations Is a digital wireless system capable of press talk calls using
The control station has a beauty Symbol憶部Oyo control section also reduced, the short message in the storage unit in association with the unique number assigned to each short message to multiple storage of the control station upper Symbol control section has a function of setting a dedicated channel to the communication channel of the radio channel, among the functions and the plurality of terminal stations to monitor the communication status of the dedicated channel, the short-circuit at least a predetermined number of terminal stations have a function to transmit a unique number assigned to the message,
The control station selects a predetermined short message from a plurality of short messages stored in the storage unit, the function of monitoring the communication state of the dedicated channel, non-call state in which the transmission right of the dedicated channel is not acquired A digital radio system characterized by transmitting a unique number assigned to the selected short message to a terminal station participating in the dedicated channel. A control station, at least one base station coupled to the control station, and a plurality of terminal stations connected to the base station via a radio channel, and a communication channel of the radio channel between the plurality of terminal stations A short message transmission method in a digital wireless system capable of making a press talk using
The control station stores a plurality of the short messages in association with a unique number assigned to each short message;
The control station selecting a predetermined short message from the plurality of stored short messages;
The control station sets a dedicated channel for at least one of the communication channels of the wireless line;
The control station detecting a non-call state in which the transmission right of the dedicated channel is not acquired;
The control station has a step of transmitting a unique number attached to the selected short message to the terminal station participating in the dedicated channel by detecting the non-call state. A short message transmission method in a digital wireless system .

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