JP4685689B2 - Wireless communication system - Google Patents

Description

  The present invention relates to a wireless communication system, and more particularly to a wireless communication system capable of switching communication methods in a train wireless system in which different communication methods are mixed.

  Conventionally, in a wireless communication system, when a mobile station such as a train (hereinafter referred to as a mobile station) communicates across a plurality of base station zones, a different base station identification signal is transmitted from each base station, and the mobile station In general, a method of connecting a mobile station and a base station by using a series of sequences such as returning a received base station identification signal as a base station designation signal has been common. According to this method, when the next zone is free, the connection can be continued, and the zone in which the mobile station exists can be occupied, so that there is an advantage of good communication efficiency.

  An example of a conventional wireless communication system (see, for example, Patent Document 1) is shown in FIG. In FIG. 5, reference numerals 501 and 502 denote leaky coaxial cables (hereinafter referred to as LCX cables) that perform radio wave radiation and reception, and configure different radio zones for the LCX cables 501 and 502. Reference numeral 503 denotes a base station A that is connected to the LCX cable 501 and constitutes an LCX zone (referred to as LCX zone A) of the LCX cable 501. This base station 503 constitutes a radio base station by using an antenna duplexer 505, a receiver Rx 506, a transmitter Tx 507, and a base station identification signal generator 508. Similarly, reference numeral 504 denotes a base station B that is connected to the LCX cable 502 and constitutes an LCX zone (referred to as LCX zone B) of the LCX cable 502. This base station 504 constitutes a radio base station by using an antenna duplexer 509, a receiver Rx510, a transmitter Tx511, and a base station identification signal generator 512. Each base station 503 and 504 transmits a different base station identification signal, and the mobile station 530 returns the received base station identification signal as a base station designation signal. Each base station is connected to the control device 520, and supplies the base station designation signal returned from the mobile station 530 to the control device 520. Based on the base station designation signals detected by the base station designation signal detectors 521 and 522, the control device 520 switches the switch 523 to select a base station system to receive. Similarly, the switch 524 selects a transmission base station system. The line connection device 525 is connected to the control device 520 and terminals 526 and 527 such as telephones.

  On the other hand, the mobile station 530 receives radio waves from the LCX cables 501 and 502 by the antenna 531, demodulates by the receiver Rx 533 through the duplexer 532, and supplies the demodulated signal to the line connection device 536. The other output from the receiver Rx 533 is supplied to the base station identification signal detector 535, and the result is output to the line connection device 536. The transmission output from the line connection device 536 is combined with the base station designation signal according to the base station identification signal and transmitted from the antenna 531 via the transmitter Tx 534 and the duplexer 532.

  Next, the operation of the system shown in FIG. 5 will be described. In FIG. 5, the signal generated from the base station identification signal generator 508 in the base station A 503 is transmitted from the transmitter 507 and is always transmitted from the LCX cable 501 via the duplexer 505. Similarly, a signal generated from the base station identification signal generator 512 in the base station B 504 is transmitted from the transmitter 511 and is always transmitted from the LCX cable 502 via the duplexer 509. These identification signals are different between LCX zone A and LCX zone B. When the mobile station 530 passes through the LCX zone A, the radio wave from the LCX cable 501 is received by the antenna 531 of the mobile station 530, and the base station identification signal detector 535 passes through the duplexer 532 and the receiver 533. A base station identification signal CC1 is detected.

  When the mobile station 530 transmits, a communication line is connected to the base station A503 in the LCX zone A by adding a signal designating the LCX zone A as a base station designating signal. When the mobile station 530 leaves the LCX zone A and enters the adjacent LCX zone B, the radio wave from the LCX zone B is received by the antenna 531 of the mobile station 530 and the base station identification signal detector 535 receives the LCX. The identification signal CC2 of the base station B504 in zone B is detected. In addition, the base station designation signal used for transmission designates LCX zone B, so that the communication line is connected to base station B 504 in LCX zone B. As described above, communication between different zones of the mobile station and the plurality of base stations is sequentially switched to perform communication. In the above conventional example, two base stations, the base station A 503 and the base station B 504, have been described, but actually, a plurality of base stations are installed at intervals of several to several tens of kilometers.

  Now, in recent railway companies, there are cases where two and three railway companies enter the vehicle with each other from the viewpoint of convenience of passengers, business expansion or securing passengers. In addition, even within a railway company, when a different communication system is used to update the railway equipment, it is problematic in terms of cost to upgrade the equipment on all lines or switch to another communication system at the same time. There are cases where partial equipment renewal or adoption of another communication method is performed. In such a case, in the conventional method, for example, when the communication method is changed, the frame is monitored, or the distance to the zone where the equipment is changed is determined by the number of rotations of the train wheel. For example, a method of switching the method, etc. can be considered, but in the frame monitoring, it is difficult to predict the timing of the frame, and the distance to the zone where the equipment is changed by the number of rotations of the wheel of the train The required method does not allow accurate measurements due to brakes or transmission delays. In addition to the train radio system, there are other problems such as equipment that measures the number of rotations of train wheels and individual settings required for each starting point of distance measurement, and a wireless communication system that can solve such problems. Realization of is desired.

JP 2000-49683 A

  There are cases where railroad companies enter and exit each other, and there are cases where new and old systems coexist in the same railway company due to the replacement of railway facilities. Realization of a wireless communication system that can be used is desired.

  An object of the present invention is to provide a highly reliable wireless communication system even on routes in which different systems are mixed.

  Another object of the present invention is to provide a radio communication system capable of smoothly switching between routes even when different routes are mixed.

  The wireless communication system of the present invention is connected to the control station, at least a first base station having a first communication method connected to the control station, and the control station, and is different from the first communication method. At least a second base station having a second communication method, and a mobile station connected to the first and second base stations via a radio channel, the first and second base stations being different bases The mobile station transmits a station identification signal, and the mobile station receives a first transmission / reception unit that receives an identification signal from the first base station having the first communication method, and a second base of the second communication method. A second transmission / reception unit that receives an identification signal from the station, a first control unit that controls the first transmission / reception unit and the second transmission / reception unit, wherein the first control unit includes at least the above-mentioned Either the identification signal from the first base station or the identification signal from the second base station A boundary between the first communication method and the second communication method is detected based on an identification signal, and the first transmission / reception unit and the second transmission / reception unit are switched based on the detection result. .

  In the wireless communication system of the present invention, the first transmission / reception unit and the second transmission / reception unit of the mobile station detect electric field strengths of signals transmitted from the first and second base stations, respectively. And when either one of the first transmission / reception unit or the second transmission / reception unit detects an electric field strength equal to or lower than a predetermined electric field strength, the first control unit is configured to transmit the first transmission / reception unit. And the second transmission / reception unit.

  In the wireless communication system of the present invention, the control station includes a second control unit that switches and connects the first base station and the second base station, and the mobile station includes the first base station The second control unit has a function of transmitting a base station designation signal to a base station or the second base station, and the second control unit is configured to transmit the first base station and the second base based on the base station designation signal. Configured to switch stations.

  In the wireless communication system of the present invention, the first communication method and the second communication method may be any one of a communication method different in analog, a communication method different in digital, or a communication method in which analog and digital are mixed. A wireless communication system, characterized in that

  As described above, according to the present invention, it is possible to realize a highly reliable wireless communication system even on a route in which different methods are mixed, and to realize a wireless communication system capable of smoothly switching between methods. In addition, since the switching point can be automatically recognized and switched without a device for measuring the distance for system switching as in the past, it is possible to reduce errors caused by factors such as braking. is there.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of a schematic configuration of an embodiment of the present invention. In FIG. 1, 101-A represents an analog A-type control station. 101-B represents a control station where analog A system and analog B system coexist. Reference numeral 101-C denotes an analog B system control station. In addition, when representing the control station, it is referred to as the control station 101. 102-1 (not shown), ... 102- (m-4), 102- (m-3), 102- (m-2), 102- (m-1), 102-m Base station A1 (not shown), ... base station A (m-4), base station A (m-3), base station A (m-2), base station A (m-1), Represents the base station Am. In addition, when representing an analog A type base station, it is referred to as base station A102. 103-1, 103-2, 103-3, 103-4,... 103-n (not shown) are base station B1, base station B2, base station B3, base station B4,. Represents a base station Bn (not shown). In addition, when representing an analog B system base station, it is referred to as a base station B103. 104-1 (not shown), ... 104- (m-4), 104- (m-3), 104- (m-2), 104- (m-1), 104-m Leaky coaxial cable (hereinafter abbreviated as LCX) 104-1 (not shown), ... LCX (m-4), LCX (m-3), LCX (m-2), LCX (m- 1) represents LCXm. Note that the analog A type LCX is referred to as LCX 104. 105-1, 105-2, 105-3, 105-4,... 105-n (not shown) represent LCX1, LCX2, LCX3, LCX4,. Note that the analog B type LCX is referred to as LCX 105. Reference numeral 106 denotes a mobile station such as a train.

  The control station 101, the base station A102, the base station B103, the LCX 104, and the LCX 105 described above are connected by a transmission path as shown in FIG. 1, and a communication zone 1 (not shown),. m-2), (m-1), m, 1, 2,... n (not shown) are arranged separately. The LCXs 104 and 105 are installed, for example, along railway lines, and communication between the mobile station 106 and the base station A 102 and the base station B 103 is performed via the LCXs 104 and 105.

  Here, the analog A method and the analog B method will be described. As explained earlier, we explained that there are cases where railroad companies carry vehicles into each other, and that old and new systems may coexist in the same railway company due to railway equipment upgrades, etc. In such a case, the analog A method is, for example, the frequency emitted from the LCX is F1, and the frame structure for communication signal transmission is T1, whereas the analog B method is, for example, emitted from the LCX. It is conceivable that the frequency to be transmitted is F2 and the frame configuration for communication signal transmission is T2. As described above, communication systems having different frequency and signal frame configurations cannot naturally communicate with each other. The present invention realizes a wireless communication system capable of transmitting and receiving for both communication methods when the communication methods are different. In FIG. 1, the control station A 101-A is located in the analog A system zone, and the control station 101-C is located in the analog B system zone. However, the control station 101-B is located in a zone in which an analog A zone and an analog B zone are mixed. The base station A102- (m-4) and the base station A102- (m-3) are located in the zone of the control station A101-A, and the base station A102- (m-2) and base station A102- (m -1), the base station A102-m, the base station B103-1, and the base station B103-2 are located in the zone of the control station B101-B, and the base station B103-3 and the base station B103-4 are the control station C101. Located in the -C zone.

  Next, the control station 101 and the base stations 102 and 103 will be described with reference to FIGS. FIG. 2 is a block diagram of a schematic configuration showing a part of the base station A102- (m-2), the base station A102- (m-1) and the control station 101-B located in the analog A system zone. The (m−3) base stations A of the base station A 102-1 to base station A 102- (m−3) are all located in the analog A system zone, and therefore all the configurations thereof are shown in FIG. Therefore, the base station A102- (m-2) and the base station A102- (m-1) are representatively described. Similarly, since (n-1) base stations B of base station B 103-2 to base station B 103-n are all located in the analog B zone, the configuration is almost the same as the configuration shown in FIG. It is. The only difference is, for example, the difference between the analog A system and the analog B system. Therefore, the base station A102- (m-2) and the base station A102- (m-1) are representatively described. Here, for convenience of explanation, the analog A method is a method in which, for example, the frequency emitted from the LCX described above is F1, and the frame configuration for communication signal transmission is T1, in this embodiment. In the present embodiment, the analog B method is a method in which, for example, the frequency emitted from the LCX described above is F2, and the frame configuration for communication signal transmission is T2, but the present invention is not limited to this. Absent. The configuration and operation of the embodiment shown in FIG. 2 are almost the same as those of the conventional wireless communication system shown in FIG.

  In FIG. 2, the base station A102- (m-2) configuring the zone (M-2) includes an antenna duplexer 201, a receiver ARx202, a transmitter ATx203, and a base station identification signal generator 204. Similarly, the base station A 102-(m−1) includes an antenna duplexer 210, a receiver ARx 211, a transmitter ATx 212, and a base station identification signal generator 213. Here, each of the base stations A102- (m-2) and 102- (m-1) transmits different base station identification signals, for example, AS (m-2) and AS (m-1) as identification IDs. Then, the mobile station 106 returns the received base station identification signal as a base station designation signal. Each base station is connected to the control unit 220 and supplies the base station designation signal returned from the mobile station 106 to the control unit 220. Based on the base station designation signals detected by the base station designation signal detectors 221 and 222, the control unit 220 switches the switch 223 to select a base station system to receive. Similarly, the switch 224 selects the transmission base station system. The line connection device 225 is connected to the control unit 220 and terminals 226 and 227 such as telephones.

  FIG. 3 is a block diagram of a schematic configuration of a part of the control station B and the base station A 102-m and the base station B 103-1. Note that the base station A 102-m and the base station B 103-1 are located in a zone where the analog A system zone is switched to the analog B system zone. In FIG. 3, a base station A 102-m is a base station A 102-m that is connected to the LCX 104-m and forms an LCX zone m. The base station A 102-m includes an antenna duplexer 301, an analog A system receiver ARx302, an analog A system transmitter ATx303, and a base station identification signal generator 304 that generates a base station identification signal ASm. The base station B 103-1 is a base station B 103-1 connected to the LCX 105-1 and configuring the LCX zone 1 of the LCX 105-1. This base station B 103-1 constitutes a radio base station by using an antenna duplexer 310, an analog B system receiver BRx 311, an analog B system transmitter BTx 312 and a base station identification signal generator 313 for generating a base station identification signal BS1. Accordingly, each base station A 102-m and base station B 103-1 transmits different base station identification signals ASm and BS1.

  Reference numeral 305 denotes a base station designation signal detector that detects a base station designation signal transmitted from the mobile station 106 described later via the base station A 102-m. Reference numeral 306 denotes an interface unit (I / F unit), and the base station A 102 -m is connected to the line connection device 324 via the I / F unit 306. Reference numeral 314 denotes a base station designation signal detector that detects a base station designation signal transmitted from the mobile station 106 described later via the base station B 103-1. Reference numeral 315 denotes an interface unit (I / F unit), and the base station B 103-1 is connected to the line connection device 324 via the I / F unit 315. Reference numeral 321 denotes a control unit (referred to as a second control unit), which receives base station designation signals from the base station designation signal detection units 305 and 314, and based on the base station designation signal, the I / F unit 306 and 315 is controlled. Reference numeral 322 denotes a counter, and 323 denotes a storage unit. 325 and 326 are terminal devices such as telephones.

  FIG. 4 shows a block diagram of a schematic configuration of the mobile station 106. In FIG. 4, 401 is an analog A system transmission / reception unit, 402 is an analog B system transmission / reception unit, 403 is a control unit (referred to as a first control unit), 404 is a line connection device, and 405 and 406 are telephones. And the like. The analog A system transmission / reception unit 401 includes an antenna 411, an antenna duplexer 412, an analog A system reception unit 413, an analog A system transmission unit 414, a base station identification signal detector 415 that detects a base station identification signal, and an I / F unit 416. It consists of The analog B system transceiver 402 includes an antenna 421, an antenna duplexer 422, an analog B system receiver 423, an analog B system transmitter 424, a base station identification signal detector 425 that detects a base station identification signal, and an I / F. Part 426. The control unit 403 includes a counter 431 and a storage unit 403, and controls the I / F units 416 and 426 based on detection signals from the base station identification signal detectors 415 and 424.

  Next, operation | movement of the radio | wireless communications system of this invention is demonstrated using FIGS. First, it is assumed that the mobile station 106 is traveling in the direction of the arrow shown in FIG. The case where the mobile station 106 passes through the zone (m-2) of the base station A102- (m-2) will be described with reference to FIG. The base station identification signal AS (m-2) generated by the base station identification signal generator 204 in the base station A102- (m-2) is transmitted from the analog A system transmission unit 203 and passes through the duplexer 201. Thus, the data is always transmitted from the LCX cable 104- (m-2). In the analog A method at this time, as described above, for example, a signal having a frequency F1 and a frame configuration for communication signal transmission T1 is transmitted. Similarly, the base station identification signal AS (m−1) generated by the base station identification signal generator 213 in the base station A 102- (m−1) is transmitted from the analog A system transmission unit 212, and is shared by the duplexer 210. Is always transmitted from the LCX cable 104- (m-1).

  Thus, when the mobile station 106 passes through the zone (m-2) of the base station A102- (m-2), the analog A system transmission / reception unit 401 of the mobile station 106 transmits the base station A102- (m-2). ) And signals. That is, the antenna 411 receives the radio wave from the LCX cable 104-(m−2), and the base station identification signal AS (m (m) is received by the base station identification signal detector 415 via the duplexer 412 and the analog A system receiving unit 413. -2) is detected. When this signal is detected, the base station identification signal detector 415 supplies the base station identification signal AS (m−2) to the control unit 403. When the control unit 403 receives this signal, the counter 431 counts the base station A 102-(m−2), and controls the I / F unit 416 to connect to the line connection device 404. The operation of the control unit 403 will be described later.

  On the other hand, the mobile station 106 that has detected the base station identification signal AS (m−2) transmits a signal designating the base station A 102− (m−2), for example, the base station designation signal AS (m−2). Attached to the signal to be transmitted from 106 is transmitted. The signal attached with the base station designation signal AS (m−2) from the mobile station 106 is transmitted from the line connection device 404 to the I / F unit 416, the analog A system transmission unit 414, the duplexer 412, and the antenna 411 to the LCX cable 104−. To (m-2). When the base station A102- (m-2) receives the signal from the mobile station 106 from the LCX cable 104- (m-2), the base station designation signal detection unit via the duplexer 201 and the analog A system reception unit 202 At 221, the base station designation signal AS (m−2) is detected and supplied to the switches 223 and 224. The switches 223 and 224 have a function of controlling switching of the base station 102. In this embodiment, the switches 223 and 224 show only switching between the base station A102- (m-2) and the base station A102- (m-1), but when there are three or more base stations. Has a function of performing a switching operation for each. In the case of FIG. 2, since the base station designation signal AS (m−2) is detected, the switches 223 and 224 determine that the mobile station 106 is passing through the zone (m−2) and connect to the line. Device 225 is connected to analog A system receiver 202 and analog A system transmitter 203. As a result, the terminal devices 405 and 406 of the mobile station 106 can communicate with the terminal devices 226 and 227 of the control station B. In this embodiment, the base station identification signal AS (m-2) and the base station designation signal AS (m-2) are the same signal, but the base station designation signal is different from the base station identification signal. You can also.

  Similarly, when the mobile station 106 enters the zone (m-1) of the base station A102- (m-1), the analog A system transmission / reception unit 401 of the mobile station 106 transmits signals to the base station A102- (m-1). Send and receive. That is, the antenna 411 receives the radio wave from the LCX cable 104- (m−1), and the base station identification signal AS (m (m) is received by the base station identification signal detector 415 via the duplexer 412 and the analog A system receiving unit 413. -1) is detected. When this signal is detected, the base station identification signal detector 415 supplies the control unit 403 with the base station identification signal AS (m−1). Upon receiving this signal, the control unit 403 counts the base station A 102-(m−1) with the counter 431 and controls the I / F unit 416 to connect to the line connection device 404. The operation of the control unit 403 will be described later.

  On the other hand, the mobile station 106 that has detected the base station identification signal AS (m−1) transmits a signal designating the base station A102- (m−1), for example, the base station designation signal AS (m−1), to the mobile station. Attached to the signal to be transmitted from 106 is transmitted. The signal attached with the base station designation signal AS (m−1) from the mobile station 106 is transmitted from the line connection device 404 to the I / F unit 416, the analog A system transmission unit 414, the duplexer 412, and the antenna 411 to the LCX cable 104−. To (m-1). When the base station A 102-(m−1) receives the signal from the mobile station 106 from the LCX cable 104-(m−1), the base station designation signal detection unit via the duplexer 210 and the analog A system reception unit 211. At 222, the base station designation signal AS (m−1) is detected and supplied to the switches 223 and 224. The switches 223 and 224 have a function of controlling switching of the base station 102 as described above. In the case of FIG. 2, since the base station designation signal AS (m−1) is detected, the switches 223 and 224 determine that the mobile station 106 is passing through the zone (m−1), The line connection device 225 is connected to the analog A system receiver 211 and the analog A system transmitter 212. As a result, the terminal devices 405 and 406 of the mobile station 106 can communicate with the terminal devices 226 and 227 of the control station B. In this way, the base station 102 is sequentially switched in accordance with the progress of the mobile station 106 so that the mobile station 106 and the base station 102 can communicate with each other.

  In the above description, when the mobile station 106 passes through the same communication system, that is, in the above embodiment, the analog A system zone, the base station 102 is sequentially switched by the above switching, and the communication is continued. . However, when the communication systems are different, for example, when the mobile station 106 enters the analog B system zone from the analog A system zone, that is, the mobile station 106 moves from the base station A 102-m to the base station B 103-1. In this case, switching cannot be performed as described above. This is because the base station A 102-m and the base station B 103-1 have different communication systems, and the analog A system transmission / reception unit 401 of the mobile station 106 cannot receive a signal from the base station B 103-1.

  The present invention solves this. This will be described with reference to FIGS. First, in the storage unit 323 of the control unit 321 and the storage unit 432 of the control unit 403 shown in FIGS. 3 and 4, the base station ID (or number) and the zone crossing counter No. Is remembered. Hereinafter, this table is referred to as a base station ID table.

表１において、通信方式は、アナログＡ方式、アナログＢ方式を表し、基地局名（またはＩＤ）は、図１に示す各基地局１０２および１０３を表す。ゾーン渡りカウンタＮｏ．は、移動局１０６が所定の基地局のゾーンから次の基地局のゾーンへ移るときに各制御部３２１のカウンタ３２２および制御部４０３のカウンタ４３１のカウント番号をカウントする、所謂、ゾーン渡りカウンタＮｏ．を表している。

In Table 1, the communication method represents the analog A method and the analog B method, and the base station name (or ID) represents each of the base stations 102 and 103 shown in FIG. Zone crossing counter No. The mobile station 106 counts the count numbers of the counter 322 of each control unit 321 and the counter 431 of the control unit 403 when the mobile station 106 moves from the zone of the predetermined base station to the zone of the next base station. . Represents.

  Now, as described above, when the mobile station 106 is passing through the base station A 102- (m−1), the base station designation signal AS (m−1) is supplied to the switches 223 and 224. did. The base station designation signal AS (m−1) of these switches 223 and 224 is also supplied to the control unit 321 (not shown). Therefore, the control units 321 and 403 refer to the base station ID table shown in Table 1 stored in the respective storage units 323 and 432 so that the mobile station 106 is passing through the communication zone of which base station. I know if there is.

  Next, a case where the mobile station 106 moves from the zone m of the base station A 102-m to the zone 1 of the base station B 103-1 will be described. First, the base station identification signal ASm generated by the base station identification signal generator 303 in the base station A 102-m is transmitted from the analog A system transmission unit 303, and always passes through the duplexer 301 to the LCX cable 104-. m. On the other hand, the base station identification signal BS1 generated by the base station identification signal generator 313 in the base station B 103-1 is transmitted from the analog B system transmission unit 312 and always passes through the duplexer 310 and the LCX cable 105-1. Sent from

  Thus, while the mobile station 106 passes through the zone m of the base station A 102-m, the analog A system transmission / reception unit 401 of the mobile station 106 transmits and receives signals to and from the base station A 102-m. That is, the antenna 411 receives the radio wave from the LCX cable 104-m, and the base station identification signal detector 415 detects the base station identification signal ASm via the duplexer 412 and the analog A system receiver 413. When this signal is detected, the base station identification signal detector 415 supplies the base station identification signal ASm to the control unit 403. When the control unit 403 receives this signal, the counter 431 is based on the base station ID table shown in Table 1 and the zone crossing counter No. Is incremented by 1 to “19”. Here, m is, for example, 20. That is, there are 20 analog A type base stations. And the zone crossing counter No. It can be seen that 19 is still an analog A base station. Therefore, the control unit 403 controls the I / F unit 416 to connect to the line connection device 404.

  On the other hand, the mobile station 106 that has detected the base station identification signal ASm transmits a signal that designates the base station A102-m, for example, a base station designation signal ASm attached to a signal that is transmitted from the mobile station 106. The signal attached with the base station designation signal ASm from the mobile station 106 is transmitted from the line connection device 404 to the I / F unit 416, the analog A system transmission unit 414, the duplexer 412, and the antenna 411 to the LCX cable 104-m. When the base station A 102-m receives the signal from the mobile station 106 from the LCX cable 104-m, the base station designation signal detection unit 305 receives the signal from the mobile station 106 via the duplexer 301 and the analog A system reception unit 302. Is detected. The detected base station designation signal ASm is supplied to the control unit 321. When the control unit 321 receives this signal, the counter 322 is based on the base station ID table shown in Table 1 and the zone crossing counter No. Is incremented by 1 to “19”.

  In the control unit 321, it can be seen from the base station ID table shown in Table 1 stored in the storage unit 323 that it is still passing through the base station A 102-m, so that the control unit 321 includes the I / F unit 306. To connect the line connection device 324 to the base station 102-m. As a result, the terminal devices 405 and 406 of the mobile station 106 can communicate with the terminal devices 325 and 326 of the control station 101-B.

  Next, assuming that the mobile station 106 further travels and enters the zone 1 of the base station B 103-1, the analog A system transmission / reception unit 401 of the mobile station 106 is connected to the analog B system base station B 103-1. The signal from the existing LCX cable 105-1 cannot be received. However, the analog B system transmission / reception unit 402 of the mobile station 106 can receive a signal from the LCX cable 105-1 connected to the analog B system base station B 103-1.

  In the control unit 321 of the control station 101-B and the control unit 403 of the mobile station 106, as described above, the zone crossing counter No. 19 is counted, the next zone crossing counter No. 20, since switching from the analog A zone to the analog B zone is stored in advance in the storage units 323 and 403, the control unit 101 -B control unit 101 -B at a predetermined time when the mobile station 106 proceeds. 321 turns off the I / F unit 306, turns on the I / F unit 315, and connects the line control device 324 to the analog B system base station 103-1. Similarly, the control unit 403 of the mobile station 106 turns off the I / F unit 416, turns on the I / F unit 426, and connects the line connection device 404 to the analog B system transmission / reception unit 402. At the same time, the counters 322 and 431 of the control units 321 and 403 are incremented by 1, and the zone crossing counter No. Is “20”.

  As a result, the base station identification signal BS1 generated by the base station identification signal generator 312 in the base station B 103-1 is transmitted from the analog B system transmission unit 312 and passes through the duplexer 310 to the LCX cable 105-. 1 is transmitted.

  Therefore, the analog B system transmission / reception unit 402 of the mobile station 106 transmits / receives a signal to / from the base station B 103-1. In other words, the antenna 421 receives the radio wave from the LCX cable 105-1, and the base station identification signal detector 425 detects the base station identification signal BS1 via the duplexer 422 and the analog B system receiving unit 423. When this signal is detected, the base station identification signal detector 425 supplies the base station identification signal BS1 to the control unit 403. As a result, the line connection device 404 attaches the base station designation signal BS1 to the transmission signal and transmits it to the LCX cable 105-1 from the I / F unit 426, analog B system transmission unit 424, duplexer 422, and antenna 421. In the base station B 103-1, the signal from the mobile station 106 is supplied to the duplexer 310, the analog B system receiving unit 311, and the base station designation signal detector 314. The base station designation signal detector 314 detects the base station designation signal BS 1 transmitted from the mobile station 106 and supplies it to the control unit 321. The control unit 321 increments the counter 322 by one based on the base station designation signal BS1, Is 20. Further, as the mobile station 106 sequentially passes through the base station 103, the switching to the analog B system base station 103 described above is the same as that described for the analog A system base station 102. Description is omitted.

  In the above embodiment, the case where all the base stations along the train are stored as shown in Table 1 in the storage units 323 and 432 has been described. However, as shown in Table 2, from the analog A system to the analog It is also possible to store only the base stations belonging to the control station 101-B that changes to the B system. Further, this can also reduce the storage capacity of the storage unit and the number of counts of the counter.

表２において、通信方式は、アナログＡ方式、アナログＢ方式を表し、基地局名（またはＩＤ）は、図１に示す統制局１０１−Ｂに所属する基地局を表す。ゾーン渡りカウンタＮｏ．は、移動局１０６が各基地局のゾーンをわたる場合にカウントされるカウントＮｏ．０〜５を示している。従って、表２においては、アナログＡ方式からアナログＢ方式に変わる場合のゾーン渡りカウンタＮｏ．は、“３”となる。

In Table 2, the communication method represents the analog A method and the analog B method, and the base station name (or ID) represents the base station belonging to the control station 101-B shown in FIG. Zone crossing counter No. Is a count number that is counted when the mobile station 106 crosses the zone of each base station. 0-5 are shown. Therefore, in Table 2, the zone crossing counter No. when the analog A system is changed to the analog B system is shown. Becomes “3”.

  Next, a method for sequentially switching base stations according to the progress of the mobile station 106 will be described. First, switching of base station A 102-1 to base station A 102- (m−1) located in the analog A system zone will be described with reference to FIG. The LCX cable at the boundary of each base station zone is as shown in FIG. In FIG. 6, the horizontal axis indicates the distance, and the vertical axis indicates the electric field strength E of the radio wave leaked from the LCX cable. Reference numeral 601 denotes an electric field strength curve of a leaked radio wave from the LCX cable 1, and reference numeral 602 denotes an electric field strength curve of a leaked radio wave from the LCX cable 2. L indicates the gap of the LCX cable and has a length of about 1 m to several m. As is apparent from FIG. 6, in the gap portion L between the LCX cables 1 and 2, the electric field strength decreases and the base station zone changes. That is, this corresponds to a change in the base station designation signal.

  This will be described by taking the base station A102- (m-2) and the base station A102- (m-1) as an example. When the mobile station 106 is moving in the zone (m-2) of the base station A102- (m-2), the analog A system receiver 413 of the analog A system transceiver 401 of the mobile station 106 is connected to the base station A102-. A sufficient level of radio waves is received from the (m-2) LCX cable 104- (m-2) (corresponding to the LCX1 shown in FIG. 6), thereby communicating with the base station A102- (m-2). Has been done. When the antenna 411 of the mobile station 106 gradually approaches the gap portion L between the LCX cables 1 and 2, the electric field strength of the leaked radio wave that can be received by the analog A system receiving unit 413 gradually decreases as shown by the electric field strength curve 601. , And decreases below the threshold Eth. This information is supplied from the analog A system receiving unit 413 to the control unit 403. In the present embodiment, the electric field strength can be measured by detecting the gain of the RF amplification unit (not shown) of the analog A type reception unit 413 input from the antenna 411, for example. The same applies to the following description.

  On the other hand, the analog A system receiver 413 of the analog A system transceiver 401 of the mobile station 106 is connected to the LCX cable 104- (m-1) (corresponding to LCX2 shown in FIG. 6) of the base station A 102- (m-1). .) Starts to be received, and as the mobile station 106 progresses, the electric field strength of the leaked radio wave that can be received by the analog A system receiving unit 413 gradually increases as indicated by the electric field strength curve 602, and finally exceeds the threshold value Eth. To increase. This information is supplied from the analog A system receiving unit 413 to the control unit 403. Therefore, in the control unit 403, when the electric field strength from the LCX cable 104- (m-2) decreases below the threshold value Eth (or the electric field strength from the LCX cable 104- (m-1) increases above the threshold value Eth. At the time), the counter 431 is incremented by 1, and the zone crossing counter No. Is “19”. In this way, the counter 431 is incremented by 1, and the zone crossing counter No. The method of incrementing by one is the same when changing other base station zones. The threshold Eth can be experimentally determined in advance.

  Next, zone switching between the base station A 102-m and the base station B 103-1 will be described. In this case, the zone switching needs to be switched from the analog A communication system to the analog B communication system. First, when the mobile station 106 is moving in the zone m of the base station A 102-m, the analog A system receiving unit 413 of the analog A system transmitting / receiving unit 401 of the mobile station 106 is connected to the LCX cable 104- of the base station A 102-m. m (corresponding to LCX1 shown in FIG. 6) is received at a sufficient level, and communication is performed with base station A 102-m. When the antenna 411 of the mobile station 106 gradually approaches the gap portion L between the LCX cables 1 and 2, the electric field strength of the leaked radio wave that can be received by the analog A system receiving unit 413 gradually decreases as shown by the electric field strength curve 601. , And decreases below the threshold Eth. This information is supplied from the analog A system receiving unit 413 to the control unit 403. Further, when the mobile station 106 advances, finally, the analog A system receiving unit 413 cannot receive the signal of the base station A 102-m. Of course, the analog A system receiving unit 413 cannot communicate with the analog B system base station B 103-1 having a different communication system.

  Therefore, in the present invention, the timing for switching from the analog A communication system to the analog B communication system is set to the conditions shown in Table 3.

即ち、表３に示すようにアナログＡ方式受信部４１３で受信できる漏洩電波の電界強度Ｅ（図６の電界強度曲線６０１で示される電界強度）が次第に減少し、閾値Ｅｔｈ以下（Ｅ≦Ｅｔｈ）となった場合、制御部４０３は、記憶部４３２に記憶されているゾーン渡りカウンタＮｏ．を参照し、その時点で、ゾーン渡りカウンタＮｏ．が“１９”であれば、制御部４０３は、Ｉ／Ｆ部４１６をＯＦＦし、Ｉ／Ｆ部４２６をＯＮする。これによってアナログＢ方式送受信部４０２が回線接続装置４０４に接続される。その結果、移動局１０６のアナログＢ方式送受信部４０２のアナログＡ方式受信部４２３には、基地局Ｂ１０３−１のＬＣＸケーブル１０５−１（図６のＬＣＸ２に相当する。）からの信号が受信され始め、移動局１０６の進行に従って、アナログＢ方式受信部４２３で受信できる漏洩電波の電界強度が電界強度曲線６０２で示されるように次第に増加する。これによって移動局１０６のアナログＢ方式送受信部４０２は、アナログＢ方式の基地局Ｂ１０３−１と通信を行うことができる。

That is, as shown in Table 3, the electric field intensity E (the electric field intensity indicated by the electric field intensity curve 601 in FIG. 6) of the leaked radio wave that can be received by the analog A system receiving unit 413 gradually decreases and is equal to or less than the threshold Eth (E ≦ Eth) In this case, the control unit 403 determines the zone crossing counter No. stored in the storage unit 432. At that time, the zone crossing counter No. If “19”, the control unit 403 turns off the I / F unit 416 and turns on the I / F unit 426. As a result, the analog B transmission / reception unit 402 is connected to the line connection device 404. As a result, the analog A system receiver 423 of the analog B system transceiver 402 of the mobile station 106 receives a signal from the LCX cable 105-1 (corresponding to LCX2 in FIG. 6) of the base station B 103-1. First, as the mobile station 106 progresses, the electric field strength of leaked radio waves that can be received by the analog B system receiver 423 gradually increases as indicated by the electric field strength curve 602. As a result, the analog B system transmission / reception unit 402 of the mobile station 106 can communicate with the analog B system base station B 103-1.

  In the above embodiment, the zone switching between the base station and the mobile station has been described. However, since the control station 101-A, the control station 101-B, or the control station 101-C also exchanges information with each other, of course, the communication method If they are different from each other, conversion is required to make the system common so that they can communicate with each other. Therefore, it is needless to say that they have mutually necessary interfaces, but are omitted in the embodiment of FIG. The same applies to the following embodiments.

  As described above in detail, in the above-described embodiment, the electric field strength in the case of the analog A communication method is set to be equal to or less than the predetermined threshold value Eth of the electric field strength when switching from the analog A communication method to the analog B communication method. However, the present invention is not limited to this, for example, by measuring the distance from the time when the mobile station 106 enters the zone of the control station 101-B from the zone of the control station 101-A. The I / F unit 416 and the I / F unit 426 can be switched. In this case, the storage unit 432 previously stores the distance from the boundary between the zone of the control station 101-A and the zone of the control station 101-B to the boundary between the zone of the base station A 102-m and the zone of the base station B 103-1. Is compared with a distance meter attached to the mobile station 106, and when the boundary between the zone of the base station A102-m and the zone of the base station B103-1 is exceeded, the control unit 403 includes the I / F unit 416, The I / F unit 426 can also be switched. Further, based on the distance from the boundary between the zone of the control station 101-A and the zone of the control station 101-B to the boundary between the zone of the base station A 102-m and the zone of the base station B 103-1, By switching the F unit 416 and the I / F unit 426, there is no need to measure a long distance from the start of the mobile station, and there is an advantage that the switching timing accuracy is improved because the measurement distance is short. . Of course, the above-described embodiment in which the time when the electric field strength becomes equal to or less than the predetermined threshold value Eth of the electric field strength is the switching timing has the feature that the accuracy is most reliable.

  FIG. 7 shows a block diagram of a schematic configuration of another embodiment of the present invention. In the embodiment shown in FIG. 7, all are digital systems, but the case where the digital A system and the digital B system coexist is shown. In FIG. 7, reference numeral 701-A denotes a digital A system control station. Reference numeral 701-B denotes a control station in which the digital A method and the digital B method are mixed. Reference numeral 701-C represents a digital B control station. The digital control station is referred to as a digital control station 701. 702-1 (not shown), ... 702- (m-4), 702- (m-3), 702- (m-2), 702- (m-1), 702-m Digital base station A1 (not shown), ... digital base station A (m-4), digital base station A (m-3), digital base station A (m-2), digital base station A ( m-1) represents the digital base station Am. When a digital A base station is represented, it is referred to as a digital base station A702. 703-1, 703-2, 703-3, 703-4,... 703-n (not shown) are digital base station B1, digital base station B2, digital base station B3, and digital base station B4, respectively. ... Represents a digital base station Bn (not shown). In addition, when representing a digital B system base station, it is referred to as a digital base station B 703. 704-1 (not shown), ... 704- (m-4), 704- (m-3), 704- (m-2), 704- (m-1), 704-m Leaky coaxial cable LCX1 (not shown) (hereinafter, the leaky coaxial cable is abbreviated as LCX),... LCX (m-4), LCX (m-3), LCX (m-2), LCX ( m-1) represents LCXm. In addition, when representing LCX, it will be referred to as LCX704. 705-1, 705-2, 705-3, 705-4,... 705-n (not shown) represent LCX1, LCX2, LCX3, LCX4,. In addition, when representing LCX, it will be referred to as LCX705. Reference numeral 706 denotes a mobile station such as a train.

  The above-described digital control station 701, digital base station A 702, digital base station B 703, LCX 704, and LCX 705 are connected by transmission paths as shown in FIG. 7, and communication zone 1 (not shown),. .. (m-2), (m-1), m, 1, 2,... N (not shown) are arranged separately. The LCXs 704 and 705 are installed, for example, along railway lines, and communication between the mobile station 706, the digital base station A 702, and the digital base station B 703 is performed via these LCXs 704 and 705.

  The digital radio communication system shown in FIG. 7 is almost the same as the analog radio communication system shown in FIG. In other words, the digital wireless communication system is the same as the analog wireless communication system except that the circuit configuration is entirely a digital circuit and the transmitted signal is also a digital signal. In addition, all the mobile stations 706 are configured by digital circuits, and are substantially the same as the analog mobile stations shown in FIG. That is, since the analog A system transmission / reception unit is changed to a digital A system transmission / reception unit and the analog B system transmission / reception unit is changed to a digital B system transmission / reception unit, the description of the configuration of the digital mobile station is omitted. To do. In addition, since it is similar to the analog method for the operation of the digital wireless communication system, description thereof is omitted.

  FIG. 8 is a block diagram showing a schematic configuration of still another embodiment of the present invention. The embodiment shown in FIG. 8 shows a case where a digital method and an analog method are mixed. In FIG. 8, reference numeral 801-A denotes a digital A system control station, which is the same as the digital A system control station 701-A shown in FIG. Reference numeral 801-B represents a control station in which a digital A system and an analog B system are mixed. This will be described later. Reference numeral 801-C denotes an analog B system control station, which is the same as the analog B system control station 101-C shown in FIG. Reference numerals 802- (m-4), 802- (m-3), 802- (m-2), 802- (m-1), and 802-m denote digital A type base stations, which are shown in FIG. Digital base station A702- (m-4), digital base station A702- (m-3), digital base station A702- (m-2), digital base station A702- (m-1), digital base station A702-m Corresponding to In addition, when representing a digital base station, it is referred to as a digital base station A 802. Reference numerals 803-1, 803-2, 803-3, and 803-4 denote analog base stations B, respectively, and are analog base station B103-1, analog base station B103-2, and analog base station B103 shown in FIG. -3, corresponding to the analog base station B103-4. In addition, when representing an analog base station, it is referred to as an analog base station B 803.

  Further, 804- (m-4), 804- (m-3), 804- (m-2), 804- (m-1), and 804-m are leaky coaxial cables LCX (m-4), LCX (m-3), LCX (m-2), LCX (m-1), LCXm are represented, and the leaky coaxial cables LCX704- (m-4), LCX704- (m-3), LCX704- shown in FIG. This corresponds to (m-2), LCX704- (m-1), and LCX704-m. 805-1, 805-2, 805-3, and 805-4 represent LCX1, LCX2, LCX3, and LCX4, respectively, and correspond to LCX105-1, LCX105-2, LCX105-3, and LCX105-4 shown in FIG. . Reference numeral 806 denotes a mobile station.

  Now, the digital control station 801-A, control station 801-B, analog control station 801-C, digital base station A 802, analog base station B 803, LCX 804, and LCX 805 described above are connected via transmission lines as shown in FIG. In addition, the communication zones are arranged separately. The LCXs 804 and 805 are installed, for example, along railway lines, and communication between the mobile station 806, the digital base station A 802, and the analog base station B 803 is performed via these LCXs 804 and 805.

  FIG. 9 shows a block diagram of a schematic configuration of a part of the control station 801-B and the digital base station A 802-m and the analog base station B 803-1. The digital base station A 802-m and the analog base station B 803-1 are located in a zone where the digital A system zone is switched to the analog B system zone. In FIG. 9, a digital base station A 802-m is a digital base station A 802-m that is connected to the LCX 804-m and forms an LCX zone m. This digital base station A 802 -m has an antenna duplexer 901, a digital A system receiver ARx 902, a digital A system transmitter ATx 903, and a base station identification signal ASm, for example, if m is 20, a digital signal “10100” (analog number) And a base station identification signal generator 904 that generates a digital signal corresponding to 20. Reference numeral 905 denotes a DAC (digital / analog converter) which converts a digital signal of the digital A receiver ARx902 into an analog signal and supplies the analog signal to the control station 801-B. Reference numeral 906 denotes an ADC (analog / digital converter) which converts an analog output signal of the control station 801-B into a digital signal and supplies the digital signal to a digital A system transmitter ATx903.

  The analog base station B 803-1 is connected to the LCX 805-1 and is an analog base station B 803-1 constituting the LCX zone 1 of the LCX 805-1. The analog base station 803-1 includes an antenna duplexer 910, an analog B system receiver BRx911, an analog B system transmitter BTx912, a base station identification signal BS1, A base station identification signal generator 913 that generates 21 constitutes a radio base station.

  Reference numeral 907 denotes a base station designation signal detection unit that detects a base station designation signal transmitted from a mobile station 806, which will be described later, via the digital base station A 802-m. Reference numeral 908 denotes an interface unit (I / F unit), and the digital base station A 802-m is connected to the line control device 924 via the I / F unit 908. Reference numeral 914 denotes a base station designation signal detection unit that detects a base station designation signal transmitted from a mobile station 806 described later via the analog base station B 803-1. Reference numeral 915 denotes an interface unit (I / F unit), and the analog base station B 803-1 is connected to the line connection device 924 via the I / F unit 915. Reference numeral 921 denotes a control unit which receives base station designation signals from the base station designation signal detection units 907 and 914, and controls the I / F units 908 and 915 based on the base station designation signals. Reference numeral 922 denotes a counter, and 923 denotes a storage unit. Reference numerals 925 and 926 denote terminal devices such as telephones.

  FIG. 10 shows a block diagram of a schematic configuration of the mobile station 806. In FIG. 10, 1001 is a digital A transmission / reception unit, 1002 is an analog B transmission / reception unit, 1003 is a control unit, 1004 is a line connection device, and 1005 and 1006 are terminal devices such as telephones. The digital A system transmission / reception unit 1001 is a DAC (digital / digital) that converts digital signals from the antenna 1011, the antenna duplexer 1012, the digital A system reception unit 1013, the digital A system transmission unit 1014, and the digital A system reception unit 1013 into analog signals. Analog converter) 1015, base station identification signal detector 1016 for detecting a base station identification signal, analog signal output of I / F unit 1018, I / F unit 1018 is converted into a digital signal output, and digital A system transmission unit 1014 It comprises an ADC (analog / digital converter) 1017 to be supplied to.

  The analog B system transceiver 1002 includes an antenna 1021, an antenna duplexer 1022, an analog B system receiver 1023, an analog B system transmitter 1024, a base station identification signal detector 1025 that detects a base station identification signal, and an I / F. The unit 1026 is configured. Control unit 1003 includes counter 1031 and storage unit 1032 and controls I / F units 1018 and 1026 based on detection signals from base station identification signal detectors 1016 and 1025.

  Thus, the configurations of the control station 801-B, the digital base station 802-m, and the analog base station B 803-1 shown in FIG. 9 are almost the same as those shown in FIG. The input / output of the station 802-m is a digital signal, so that the digital base station 802-m is coupled to the control station 801-B via the DAC 905 and the ADC 906. Therefore, the operation of the system shown in FIG. 9 is almost similar to the operation of the system shown in FIG. Further, the configuration of the digital A system transmission / reception unit 1001, the analog B system transmission / reception unit 1002, the control unit 1003, and the line control device 1004 shown in FIG. 10 is substantially the same as the configuration shown in FIG. The input / output of the A system transmission / reception unit 1001 is a digital signal. Therefore, the digital output signal of the digital A system reception unit ARx1013 is converted into an analog signal by the DAC 1015 and input to the I / F unit 1018, and from the I / F unit 1018. The analog output signal is converted to a digital signal by the ADC 1017 and supplied to the digital A transmission unit ATx1014. Therefore, the operation of the mobile station 806 shown in FIG. 10 is almost the same as that of the mobile station 106 shown in FIG.

  In FIG. 9, the control station 801-B is an analog system, the digital base station A 802-m is a digital system, and an input / output signal of the digital base station A 802-m is converted to an analog signal by the DAC 905 and the ADC 906. However, the present invention is not limited to this method. For example, the control station 801-B is a digital control station, and the analog input / output signal of the analog base station B 803-1 is converted into an A / D converter and a D / A. It is also possible to convert the analog base station B 803-1 to a digital control station 801-B by converting it into a digital signal using a converter.

  Although the present invention has been described in detail above, the present invention is not limited to the embodiments of the wireless communication system described here, and systems having different systems such as wireless communication systems other than the above are mixed. Needless to say, even a case system can be easily adapted.

The block diagram of schematic structure of one Example of this invention is shown. The block diagram of schematic structure of the control station and base station of one Example of this invention shown in FIG. 1 is shown. The block diagram of schematic structure of the control station of one Example of this invention shown in FIG. 1 and another base station is shown. 1 is a block diagram showing a schematic configuration of a mobile station according to an embodiment of the present invention shown in FIG. The block diagram of schematic structure of an example of the conventional radio | wireless communications system is shown. It is a figure which shows the electric field strength distribution for demonstrating operation | movement of this invention. The block diagram of schematic structure of other one Example of this invention is shown. The block diagram of schematic structure of other one Example of this invention is shown. FIG. 9 is a block diagram showing a schematic configuration of a control station and a base station according to still another embodiment of the present invention shown in FIG. 8. FIG. 9 is a block diagram showing a schematic configuration of a mobile station according to still another embodiment of the present invention shown in FIG. 8.

Explanation of symbols

  101: control station, 102, 103: base station, 104, 105, 501, 502, 704, 705, 804, 805: leaky coaxial cable, 106, 530, 706, 806: mobile station, 201, 210, 301, 310 412, 422, 505, 509, 532, 901, 910, 1012, 1022: duplexer, 202, 302, 413: analog A system receiver, 203, 303, 414: analog A system transmitter, 204, 213, 304, 313, 508, 512, 535, 913: Base station identification signal generator, 211, 311, 423, 911, 1023: Analog B system receiver, 212, 312, 424, 912, 1024: Analog B system transmitter , 221, 222, 305, 314, 521, 522, 907, 914: Base station designation signal detection 223, 224, 523, 524: Switch, 225, 324, 404, 525, 536, 924, 1004: Line connection device, 226, 227, 325, 326, 405, 406, 526, 527, 925, 926, 1005, 1006: Terminal device, 306, 315, 416, 908, 915, 1018, 1026: I / F unit, 220, 321, 403, 921, 1003: Control unit, 322, 431, 922, 1031: Counter, 323 432, 923, 1032: storage unit, 401: analog A system transmission / reception unit, 402, 1002: analog B system transmission / reception unit, 411, 421, 531, 1011, 1021: antenna, 415, 425, 1016, 1025: base station Identification signal detector, 503: base station A, 504: base station B, 506, 51 533: Receiver, 507, 511, 534: Transmitter, 701, 801-A: Digital control station, 702, 802: Digital base station A, 703: Digital base station B, 801-C: Analog control station, 803 : Analog base station B, 902, 1013: Digital A system receiver, 903, 1014: Digital A system transmitter, 904: Digital identification signal generator, 905, 1015: DAC, 906, 1017: ADC, 1001: Digital A System transmitter / receiver.

Claims (2)

A first control station, and the second control station adjacent to the first control station, at least a first base station having a first communication method is connected to the first control station, said first At least a second base station connected to one control station and having a second communication method different from the first communication method, and a mobile station connected to the first and second base stations via a radio channel The first and second base stations transmit different base station identification signals, and the mobile station receives an identification signal from the first base station having the first communication method. A first transmitter / receiver, a second transmitter / receiver that receives an identification signal from the second base station of the second communication method, and a first that controls the first transmitter / receiver and the second transmitter / receiver. a control unit, and a distance meter, the first control unit, the second of the control station zone and the first control station The distance from the zone boundary to the boundary between the zone of the first base station and the zone of the second base station is stored in advance, and the mobile station moves from the zone of the second control station to the zone of the second base station. When entering the zone of the second base station through the zone of one base station, the distance from the boundary between the zone of the second control station and the zone of the first control station is determined by the distance meter. measured, when the distances the measurement exceeds a distance that the storage, the wireless communication system, characterized in that switching from the first transceiver to the second transceiver.   2. The radio communication system according to claim 1, wherein the control station includes a second control unit that switches and connects the first base station and the second base station, and the mobile station includes the first base station. The second control unit has a function of transmitting a base station designation signal to a base station or the second base station, and the second control unit is configured to transmit the first base station and the second base based on the base station designation signal. A radio communication system characterized by switching stations.

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