JP2018142770A - Wireless communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless communication system in which a mobile station can automatically switch a wireless method.SOLUTION: A wireless communication system 100A is a wireless communication system for performing wireless communications between a mobile station 21 on a mobile object 2, and a plurality of base stations. The plurality of base stations include: a first regular base station 30 which performs, by a first wireless method, transmission and reception of normal signals with the mobile station 21 in a first communication area 1a; a second regular base station 50 which performs, by a second wireless method different from the first wireless method, transmission and reception of normal signals with the mobile station 21 in a second communication area 1b; and a plurality of switching base stations 31, 32, 51, 52 which transmit switching signals 421, 422, 413, 412 respectively. When having received a plurality of switching signals 421, 422, 413, 412 in normal forms, the mobile station 21 switches the wireless method for performing transmission and reception of normal signals between the first and second wireless methods.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a radio communication system such as a train radio system that performs radio communication between a mobile station on a mobile body and a plurality of base stations, and more particularly, a radio communication system having a function of automatically switching a radio system by a mobile station. It is about.

  A train is equipped and operated with a radio communication system (hereinafter also referred to as a “train radio system”) as a means of communication with an operation command center and emergency relief arrangements. In the train radio system, the frequency used for radio communication is assigned to each line section separated by a certain range, and when the train runs across the line sections, the radio communication channel corresponds to the frequency of each line section. Switching to something.

  In the conventional train radio system, the train crew manually switches the radio communication channel when the train passes through the point where the radio communication channel is switched. However, there are concerns about human error such as omission of switching. Therefore, there is a need for a system that automatically switches wireless communication channels.

  Patent Document 1 discloses a wireless communication system that performs wireless communication between a mobile station on a mobile body (train) and a ground base station, and a switching base station that transmits a switching signal is newly installed on the ground. Thus, a wireless communication system that can automatically switch wireless communication channels is disclosed.

  More specifically, the above wireless communication system is a wireless communication system that can automatically switch wireless communication channels by using two types of switching base stations (preliminary base station and fixed base station), When the mobile station receives a switching signal (confirmation signal) transmitted from the notification base station after receiving the switching signal (confirmation signal) transmitted from the notification base station near the wireless communication channel switching point, the wireless communication is performed. 1 is a wireless communication system that switches channels.

  The technique described in Patent Document 1 cannot cope with a case where the mobile station cannot receive at least one of the warning signal and the confirmation signal due to some trouble such as a device failure and the switching failure of the wireless communication channel occurs. Therefore, Patent Document 2 discloses a wireless communication system that can suppress a radio communication channel switching omission by using a compulsory base station in addition to a notice base station and a confirmed base station. In the technique described in Patent Document 2, when a mobile station receives a switching signal (forced signal) transmitted from a forced base station, the mobile station forcibly switches the wireless communication channel.

  In the techniques described in Patent Document 1 and Patent Document 2, wireless communication is performed without increasing the wireless frequency to be used by transmitting the normal signal and the switching signal used for the purpose of operating the train wireless system in a time-sharing manner. Channel switching is realized. This time division is realized by allocating the switching signal to one frame in the superframe by using the fact that the mobile station and the base station are synchronized in a unit frame (also called “superframe”) consisting of multiple frames. doing.

  In the train radio system as described above, when a train travels across line sections with different frequencies, it is possible for the mobile station to automatically switch the radio communication channel while suppressing the switching omission of the radio communication channel. .

JP 2010-10865 A JP2015-159389A

  In recent years, the number of railway operators that shift the radio system of the train radio system from analog to digital is increasing, and on routes that operate across multiple railway operators, the management section for each railway operator Depending on the case, the wireless system may be different. In addition, even in a management section of the same railway operator, there may be a mixture of wireless and analog line sections. Since the analog radio system and the digital radio system are independent radio standards, the radio system of the mobile station must be switched when the train travels across different radio system lines. Therefore, there is a demand for a wireless communication system having a function for automatically switching wireless systems. However, since the conventional wireless communication system is a system that switches wireless communication channels, there is a problem that it cannot cope with switching of wireless systems.

  Therefore, the present invention has been made to solve the above-described problems, and automatically switches the radio system in a mobile station on a moving body that moves in a place where two radio systems coexist. An object of the present invention is to provide a wireless communication system capable of

  The wireless communication system according to the present invention is a wireless communication system that performs wireless communication between a mobile station on a mobile object and a plurality of base stations. The plurality of base stations include a first normal base station, a second normal base station, and a plurality of switching base stations. The first normal base station transmits and receives normal signals to and from the mobile station in the first communication area using the first wireless method. The second normal base station transmits and receives normal signals to and from the mobile station using a second radio scheme different from the first radio scheme in the second communication area. The plurality of switching base stations respectively transmit a plurality of switching signals. When the mobile station receives a plurality of switching signals in a regular manner, the mobile station switches the wireless method for transmitting and receiving the normal signal between the first wireless method and the second wireless method.

  According to the wireless communication system of the present invention, when a mobile station receives a plurality of switching signals respectively transmitted from a plurality of switching base stations in a normal manner, the mobile station performs a wireless method for transmitting and receiving a normal signal as a first wireless. Switch between the method and the second wireless method. As a result, the radio system can be automatically switched in a mobile station on a moving body that moves in a place where two radio systems coexist.

It is a figure which shows the whole structure of the radio | wireless communications system which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the mobile station which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the communication frame which concerns on Embodiment 1 of this invention. 4 is a flowchart showing an operation of switching radio schemes by a mobile station according to Embodiment 1 of the present invention. It is a figure which shows the whole structure of the radio | wireless communications system which concerns on Embodiment 2 of this invention. It is a flowchart which shows the operation | movement which the mobile station which concerns on Embodiment 2 of this invention switches a radio system. It is a figure which shows the whole structure of the radio | wireless communications system which concerns on Embodiment 3 of this invention. It is a figure which shows the structure of the communication frame which concerns on Embodiment 3 of this invention. It is a figure which shows the whole structure of the radio | wireless communications system which concerns on Embodiment 4 of this invention. It is a figure which shows the structure of the communication frame which concerns on Embodiment 4 of this invention. It is a figure for demonstrating the state transition of the mobile station restrict | limited in the interference zone which concerns on Embodiment 5 of this invention. It is a figure which shows the state transition of the mobile station in the interference zone 1d which concerns on Embodiment 5 of this invention. It is a figure which shows the state transition of the mobile station in the interference zone 1e which concerns on Embodiment 5 of this invention. It is a flowchart which shows the operation | movement which the mobile station which concerns on Embodiment 5 of this invention switches a radio system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Embodiment 1>
<Overall configuration of wireless communication system>
FIG. 1 is a diagram illustrating an example of an overall configuration of a wireless communication system 100A according to Embodiment 1 of the present invention. The wireless communication system 100A includes a mobile station 21, a first normal base station 30, a first notice base station 31, a first confirmed base station 32, a second notice base station 51, and a second confirmed base station 52. Is a system for performing wireless communication. In the present embodiment, radio communication system 100A is a train radio system, and mobile body 2 is a train that travels on route 1. In the example of FIG. 1, the moving body 2 travels on the route 1 in the right direction or the left direction in FIG.

  As shown in FIG. 1, the radio communication system 100A has a first communication area 1a and a second communication area 1b. The first communication area 1a is a normal signal transmitted by the first normal base station 30 using the first radio system (a signal used for operational purposes such as communication with an operation command center. Call area). The second communication area 1b is a normal signal transmitted by the second normal base station 50 by the second radio system (a signal used for operational purposes such as communication with the operation command center. Hereinafter, also referred to as "second normal signal") Call area).

  The first communication area 1a and the second communication area 1b partially overlap each other, and the third communication area 1c, which is the overlapping area, includes the first normal signal and the second normal signal transmitted by the first normal base station 30. It is a communication area where both the second normal signal transmitted by the normal base station 50 can reach. The first radio scheme and the second radio scheme are independent radio schemes having different radio standards, and the first radio scheme and the second radio scheme are, for example, an analog scheme and a digital scheme, respectively.

  The route 1 extends over the first communication area 1a, the third communication area 1c, and the second communication area 1b, and the mobile unit 2 passes from the first communication area 1a through the third communication area 1c to the second communication area 1b. Alternatively, the vehicle moves from the second communication area 1b to the first communication area 1a through the third communication area 1c. For this reason, in radio communication system 100A according to the present embodiment, mobile station 21 on mobile unit 2 uses a radio system that transmits and receives normal signals according to the communication area between the first radio system and the second radio system. It has a function to switch automatically.

  The first normal base station 30 is systematically synchronized with the first notice base station 31 and the first confirmed base station 32 via the first line 3D. The first notice base station 31 transmits the first notice signal 421 to the area 31a in the first communication area 1a by the first wireless method. The first confirmed base station 32 transmits the first confirmed signal 422 to the area 32a in the first communication area 1a by the first wireless method.

  Each of the first notice signal 421 and the first confirmation signal 422 is a switching signal for switching the radio system in which the mobile station 21 transmits and receives the normal signal from the first radio system to the second radio system. Is also referred to as a “first switching signal”. In addition, each of the first notice base station 31 and the first confirmed base station 32 is a switching base station that transmits a first switching signal, and is hereinafter also referred to as a “first switching base station”.

  The second normal base station 50 is systematically synchronized with the second notice base station 51 and the second confirmed base station 52 via the second line 5D. The second notice base station 51 transmits the second notice signal 413 to the area 51a in the second communication area 1b by the second wireless method. The second confirmed base station 52 transmits the second confirmed signal 412 to the area 52a in the second communication area 1b by the second wireless method.

  Each of the second notice signal 413 and the second confirmation signal 412 is a switching signal for switching the wireless method in which the mobile station 21 transmits and receives the normal signal from the second wireless method to the first wireless method. Is also referred to as a “second switching signal”. Each of the second foreseeing base station 51 and the second confirmed base station 52 is a switching base station that transmits a second switching signal, and is hereinafter also referred to as a “second switching base station”.

  The mobile station 21 normalizes the first switching signals 421 and 422 transmitted from the first switching base stations 31 and 32 and the second switching signals 413 and 412 transmitted from the second switching base stations 51 and 52, respectively. In the case of receiving in this manner, the wireless method for transmitting and receiving the normal signal is switched between the first wireless method and the second wireless method. Specifically, when the mobile station 21 receives the first confirmation signal 422 after receiving the first notice signal 421, the mobile station 21 switches the wireless method for transmitting and receiving the normal signal from the first wireless method to the second wireless method. . Further, when the mobile station 21 receives the second confirmation signal 412 after receiving the second notice signal 413, the mobile station 21 switches the wireless method for transmitting and receiving the normal signal from the second wireless method to the first wireless method.

  As described above, when the mobile station 21 receives the first notice signal 421 and the first confirmation signal 422 or the second notice signal 413 and the second confirmation signal 412 in a regular order, the mobile station 21 switches the radio system. The area where each switching signal is transmitted is appropriately set so that the radio system 21 can switch the radio system according to the communication area.

  For example, the region 31a to which the first notice signal 421 is transmitted and the region 32a to which the first confirmation signal 422 is transmitted are compared with the wireless system switching point (near the third communication area 1c) in the first communication area 1a. It is set at a close position. Further, in the area 31a and the area 32a, the mobile station 21 on the moving body 2 moving from the first communication area 1a toward the second communication area 1b sends the first notice signal 421 and the first confirmation signal 422 in that order. It is set to a position where it can be received.

  On the other hand, the area 51a to which the second notice signal 413 is transmitted and the area 52a to which the second confirmation signal 412 is transmitted are set at positions relatively close to the wireless system switching point in the second communication area 1b. Further, in the areas 51a and 52a, the mobile station 21 on the moving body 2 moving from the second communication area 1b toward the first communication area 1a receives the second notice signal 413 and the second confirmation signal 412 in this order. It is set to a position where it can be received. In the example of FIG. 1, the area 32a and the area 52a are set in the third communication area 1c, but the positions of the area 32a and the area 52a are not limited to this.

  Each of the first normal base station 30, the first notice base station 31, and the first confirmed base station 32 that performs radio communication by the first radio system transmits a signal at the frequency f1, but each base station is synchronized. Since each signal is transmitted after being divided in time and space, there is no interference. In addition, each of the second normal base station 50, the second notice base station 51, and the second confirmed base station 52 that performs radio communication by the second radio system transmits a signal at the frequency f2. Since each signal is transmitted by being divided in time and space, there is no interference. Since the frequency f1 and the frequency f2 are different from each other, the first radio system signal and the second radio system signal do not interfere with each other.

<Configuration of mobile station>
FIG. 2 is a block diagram showing an example of the configuration of mobile station 21 according to Embodiment 1 of the present invention. As shown in FIG. 2, the mobile station 21 includes a first mobile station 21a capable of receiving a first normal signal and a first switching signal (hereinafter also referred to as “first signal”), a second normal signal, and a first normal signal. And a second mobile station 21b capable of receiving two switching signals (hereinafter also referred to as “second signals”). As a result, the mobile station 21 is in a state where it can always receive both the first signal and the second signal, but for operation (that is, transmission / reception of the normal signal), whichever of the first mobile station 21a and the second mobile station 21b is used. Use only one of them.

  The mobile station 21 further includes a switching unit 21c, a determination unit 21d, and a storage unit 21e. After receiving and demodulating the first signal, the first mobile station 21a inputs the first switching signal to the determination unit 21d as the first switching data 21ad. After receiving and demodulating the second signal, the second mobile station 21b inputs the second switching signal to the determination unit 21d as the second switching data 21bd. The determination unit 21d determines a method to be used for the operation of the wireless communication system by referring to the information of each of the first switching data 21ad and the second switching data 21bd and the parameters stored in the storage unit 21e, and determines the result. Input to the switching unit 21c.

  The switching unit 21c inputs an enable signal 21ce to the first mobile station 21a when a result indicating that the method used for operation is the first wireless method is input from the determination unit 21d. On the other hand, when the result that the method used for operation is the second wireless method is input from the determination unit 21d, the switching unit 21c inputs the enable signal 21ce to the second mobile station 21b.

  When the enable signal 21ce is input to the first mobile station 21a, the first mobile station 21a processes the first normal signal as an operation signal of the wireless communication system, and the second mobile station to which the enable signal 21ce is not input. 21b does not process the operation signal. On the other hand, when the enable signal 21ce is input to the second mobile station 21b, the second mobile station 21b processes the second normal signal as an operation signal of the wireless communication system, and the enable signal 21ce is not input. The mobile station 21a does not process the operation signal. The mobile station 21 is always in a state where it can receive signals of the first radio system and the second radio system, but the radio system is automatically set by processing a normal signal of either radio system as an operation signal. It is possible to switch.

<Configuration of communication frame>
FIG. 3 is a diagram showing an example of a configuration of a communication frame according to Embodiment 1 of the present invention. In FIG. 3, the mobile unit 2 is in the first communication area 1a, and communication between the first mobile station 21a, the first normal base station 30, and the first switching base stations 31, 32 is performed. The structure of a communication frame is shown. FIG. 3 also shows a block diagram showing the configuration of the first mobile station 21a.

  As described above, since the first normal base station 30 and the first switching base stations 31 and 32 transmit signals at the same frequency f1 in the same space, interference occurs unless the signals are divided in time. To do. Therefore, as shown in FIG. 3, the configuration of the communication frame in the communication performed between the first mobile station 21a, the first normal base station 30, and the first switching base stations 31, 32 includes a plurality of frames F1 to F1. It has a super frame structure in which communication is performed using a super frame SF composed of FN as a unit frame.

  In this configuration, the first switching signal is assigned to one frame Fj1 in the superframe SF, and the first normal signal composed of the first operation signal and the first synchronization signal is assigned to the other frames. Timing control is performed so that these signals do not interfere with each other. Since the first normal base station 30 is synchronized with the first switching base stations 31 and 32 via the first line 3D, the start timing SFt of the superframe SF at each base station matches, and the first normal signal And the timing control of the first switching signal is accurate.

  The first mobile station 21a includes a first operation signal processing unit 21a1 that processes a first operation signal, a first synchronization signal processing unit 21a2 that processes a first synchronization signal, and a first switching signal that processes a first switching signal. And a processing unit 21a3. If the first mobile station 21a cannot receive the first synchronization signal, the first mobile station 21a cannot communicate with each of the first normal base station 30, the first foreseeing base station 31, and the first confirmed base station 32, and communicates. Cannot be established. That is, the first mobile station 21a can receive the first switching signal only when it is in the first communication area 1a where the first normal signal from the first normal base station 30 can be received. Similarly, in the second wireless system, the second mobile station 21b can receive the second switching signal only when it is within the second communication area 1b.

  Note that the configuration of the second mobile station 21b and the configuration of the communication frame in the second wireless communication between the second mobile station 21b, the second normal base station 50, and the second switching base stations 51 and 52 are as described above. In the description, since “first to second” is replaced with “second to second”, illustration and detailed description are omitted.

<Wireless switching operation>
FIG. 4 is a flowchart showing an operation of switching radio schemes by the mobile station 21 according to Embodiment 1 of the present invention. Hereinafter, with reference to the figure, a procedure of switching processing in which the mobile station 21 receives each switching signal and performs transmission / reception of the normal signal between the first wireless system and the second wireless system will be described.

  First, in step S0, when the initial operation state of the mobile station 21, that is, the state of the mobile station 21 at the start of operation, is the first operation state in which the radio system is the first radio system, step S1 is executed. . On the other hand, when the initial operation state of the mobile station 21 is the second operation state in which the wireless method is the second wireless method, step S2 is executed. The initial operation state of the mobile station 21 is manually set by, for example, a user (a crew member when the mobile body 2 is a train as in the present embodiment), and step S1 or step S2 is performed based on the setting content. Executed.

  In the following, for convenience of explanation, the radio system for starting operation of the mobile station 21 is the first radio system, and the mobile body 2 moves from the first communication area 1a to the second communication area 1b, so that the mobile station 21 A case where the wireless method is switched from the first wireless method to the second wireless method will be described.

  As described above, since the mobile station 21 is in the first radio system at the start of operation, step S1 is executed after step S0. In step S1, the mobile station 21 enters a first standby state in which the first normal signal is processed as an operation signal. In step S5, the determination unit 21d determines whether the mobile station 21 has received the first notice signal 421. For example, when the first switching data 21ad is input from the first mobile station 21a, the determination unit 21d determines that the mobile station 21 is the first based on the first switching data 21ad and the parameters stored in the storage unit 21e. It is determined whether or not the advance notice signal 421 has been received.

  If it is determined in step S5 that the mobile station 21 has received the first notice signal 421, step S7 is executed. On the other hand, if it is determined that the mobile station 21 has not received the first notice signal 421, step S1 is executed again. Until it is determined in step S5 that the mobile station 21 has received the first notice signal 421, the processes in steps S1 and S5 are repeatedly executed at predetermined time intervals, for example.

  In step S <b> 7, the state of the mobile station 21 transitions to a first confirmation signal standby state that waits for the first confirmation signal 422. In step S <b> 11, the determination unit 21 d determines whether the mobile station 21 has received the first confirmation signal 422. For example, when the first switching data 21ad is input from the first mobile station 21a, the determination unit 21d generates the first confirmation signal 422 based on the first switching data 21ad and the parameters stored in the storage unit 21e. It is determined whether or not it has been received.

  If it is determined in step S11 that the mobile station 21 has received the first confirmation signal 422, step S13 is executed. On the other hand, if it is determined that the mobile station 21 has not received the first confirmation signal 422, step S1 is executed again, and the state of the mobile station 21 returns to the first standby state.

  In step S13, the mobile station 21 switches the radio system from the first radio system to the second radio system. Specifically, when the switching unit 21c inputs the enable signal 21ce to the second mobile station 21b, the mobile station 21 switches the wireless method for transmitting and receiving the normal signal from the first wireless method to the second wireless method. In step S2, the mobile station 21 enters a second standby state in which the second normal signal is processed as an operation signal. The processes of steps S2, S6, S8, S12, and S14 are the same as the case where “first to second” is replaced with “second to second” in the processes of steps S1, S5, S7, S11, and S13 described above, respectively. Therefore, detailed description is omitted.

  As described above, in the radio communication system 100A according to the present embodiment, when the mobile station 21 whose radio system is the first radio system receives the first confirmation signal 422 after receiving the first notice signal 421, Then, the wireless method for transmitting and receiving the normal signal is switched from the first wireless method to the second wireless method. Further, when the mobile station 21 whose radio system is the second radio system receives the second confirmation signal 412 after receiving the second notice signal 413, the radio system for transmitting and receiving the normal signal is changed from the second radio system. Switch to the first radio system. Thereby, when the mobile body 2 moves across the communication areas of the two wireless systems, the mobile station 21 can automatically switch the wireless system.

<Embodiment 2>
Hereinafter, the radio | wireless communications system which concerns on Embodiment 2 of this invention is demonstrated. The wireless communication system according to the present embodiment can receive at least one of the second notice signal 413 and the second confirmation signal 412 when at least one of the first notice signal 421 and the first confirmation signal 422 cannot be received. It has a function to suppress the switching omission of the wireless system when there is no such.

  FIG. 5 is a diagram illustrating an example of an overall configuration of a radio communication system 100B according to Embodiment 2 of the present invention. As shown in FIG. 5, the radio communication system 100B according to the present embodiment is different from the radio communication system 100A according to the first embodiment shown in FIG. A base station 34 is further provided. In the present embodiment, the mobile station 21 that has received a forcible signal transmitted from each of the first forcible base station 54 and the second forcible base station 34 forcibly switches the radio system. In FIG. 5, the same components as those described in the previous drawings are denoted by the same reference numerals, and the description thereof is omitted. The same applies to the following drawings.

  The first forced base station 54 is systematically synchronized with the second notice base station 51 and the second confirmed base station 52 via the second line 5D. The first forced base station 54 transmits the first forced signal 423 to the region 54a in the second communication area 1b by the second wireless method. Since the first mobile station 21a cannot receive the first synchronization signal transmitted from the first normal base station 30 in the second communication area 1b, the first mobile station 21a may establish superframe synchronization in the first radio system. The switching signal cannot be received by the first wireless method. On the other hand, in the second communication area 1b, the second mobile station 21b can receive the second synchronization signal transmitted from the second normal base station 50. Therefore, the first forced base station 54 can communicate with the mobile station 21 by transmitting the first forced signal 423 by the second wireless method in the second communication area 1b.

  The second forced base station 34 is systematically synchronized with the first notice base station 31 and the first confirmed base station 32 via the first line 3D. Similar to the first forced base station 54, the second forced base station 34 transmits a second forced signal 411 to the region 34a in the first communication area 1a by the first wireless method, thereby communicating with the mobile station 21. Communication is enabled. At this time, since the first compulsory base station 54 transmits a signal by the same wireless method as the second notice base station 51 and the second confirmed base station 52, it is necessary to shift the transmission area so that the signal does not interfere. There is. In addition, since the second forced base station 34 transmits a signal by the same wireless method as the first notice base station 31 and the first confirmed base station 32, it is necessary to install the second forced base station 34 by shifting the transmission area so that the signal does not interfere. is there.

  The first forcing signal 423 is a switching signal for switching the radio system in which the mobile station 21 transmits and receives the normal signal from the first radio system to the second radio system, and is also referred to as a “first switching signal” below. The first forced base station 54 is a switching base station that transmits the first switching signal, and is also referred to as a “first switching base station” below. The second forcing signal 411 is a switching signal for switching the radio system in which the mobile station 21 transmits / receives the normal signal from the second radio system to the first radio system, and is hereinafter referred to as a “second switching signal”. Call. The second forced base station 34 is a switching base station that transmits a second switching signal, and is hereinafter also referred to as a “second switching base station”.

  When the mobile station 21 receives the first forced signal 423 when the wireless method for transmitting and receiving the normal signal is the first wireless method, the mobile station 21 changes the wireless method for transmitting and receiving the normal signal from the first wireless method to the first wireless method. Switch to 2 wireless system. Further, when the mobile station 21 receives the second forced signal 411 when the wireless method for transmitting and receiving the normal signal is the second wireless method, the mobile station 21 changes the wireless method for transmitting and receiving the normal signal to the second wireless method. To the first radio system.

  In the present embodiment, the first forcing signal 423 is used in order to cope with the switching omission from the first radio system to the second radio system due to the first notice signal 421 and the first confirmation signal 422. Further, the second forcible signal 411 is used in order to cope with the omission of switching from the second radio system to the first radio system due to the second notice signal 413 and the second confirmation signal 412.

  Therefore, the region where the first forced signal 423 and the second forced signal 411 are transmitted is appropriately set so that the mobile station 21 can switch the wireless system according to the communication area. For example, the area 54a to which the first forced signal 423 is transmitted is at a position relatively close to the wireless system switching point (near the boundary between the first communication area 1a and the second communication area 1b) in the second communication area 1b. Is set. The region 54a is a position where the moving body 2 moving from the first communication area 1a toward the second communication area 1b can receive the first notice signal 421, the first confirmation signal 422, and the first forced signal 423 in that order. Set to

  On the other hand, the area 34a to which the second forced signal 411 is transmitted is set, for example, at a position relatively close to the wireless system switching point in the first communication area 1a. The region 34a is a position where the moving body 2 moving from the second communication area 1b toward the first communication area 1a can receive the second notice signal 413, the second confirmation signal 412 and the second forced signal 411 in that order. Set to

  FIG. 6 is a flowchart showing an operation in which the mobile station 21 according to Embodiment 2 of the present invention switches radio schemes. As shown in FIG. 6, steps S3, S4, S9, and S10 are further provided as compared with the flowchart shown in FIG. 4 in the first embodiment.

  First, in step S0, when the initial operation state of the mobile station 21 is the first operation state, step S1 is executed. On the other hand, when the initial operation state of the mobile station 21 is the second operation state, step S2 is executed.

  In the following, for convenience of explanation, the radio system for starting operation of the mobile station 21 is the first radio system, and the mobile body 2 moves from the first communication area 1a to the second communication area 1b, so that the mobile station 21 A case where the wireless method is switched from the first wireless method to the second wireless method will be described.

  As described above, since the mobile station 21 is in the first radio system at the start of operation, step S1 is executed after step S0. In step S1, the mobile station 21 enters the first standby state. In step S <b> 3, the determination unit 21 d determines whether the mobile station 21 has received the first forcing signal 423. For example, when the first switching data 21ad is input from the first mobile station 21a, the determination unit 21d determines that the mobile station 21 is the first based on the first switching data 21ad and the parameters stored in the storage unit 21e. It is determined whether or not the forced signal 423 has been received.

  If it is determined in step S3 that the mobile station 21 has received the first forced signal 423, step S13 is executed. In step S13, the mobile station 21 switches the radio system from the first radio system to the second radio system.

  On the other hand, if it is determined that the mobile station 21 has not received the first forced signal 423, step S5 is executed. If it is determined in step S5 that the mobile station 21 has received the first notice signal 421, step S7 is executed. On the other hand, if it is determined that the mobile station 21 has not received the first notice signal 421, step S1 is executed again. Until it is determined in step S3 that the mobile station 21 has received the first forced signal 423, or until it is determined in step S5 that the mobile station 21 has received the first notice signal 421, steps S1, S3, and S5 are performed. This process is repeatedly executed, for example, every predetermined time.

  In step S7, the state of the mobile station 21 transitions to the first confirmed signal standby state. In step S <b> 9, the determination unit 21 d determines whether the mobile station 21 has received the first forcing signal 423. Since the content of the process in step S9 is the same as that in step S3, detailed description thereof is omitted.

  If it is determined in step S9 that the mobile station 21 has received the first forced signal 423, step S13 is executed. On the other hand, if it is determined that the mobile station 21 has not received the first forced signal 423, step S11 is executed.

  In step S <b> 11, the determination unit 21 d determines whether or not the mobile station 21 has received the first confirmation signal 422. If it is determined in step S11 that the mobile station 21 has received the first confirmation signal 422, step S13 is executed. On the other hand, if it is determined that the mobile station 21 has not received the first confirmation signal 422, step S1 is executed again, and the state of the mobile station 21 returns to the first standby state.

  In step S13, the mobile station 21 switches the radio system from the first radio system to the second radio system. In step S2, the mobile station 21 enters the second standby state. The processes of steps S2, S4, S6, S8, S10, S12, and S14 are the same as the processes of steps S1, S3, S5, S7, S9, S11, and S13, respectively, described above as “second” Since it is the same as the case where it is replaced with “˜”, the detailed description is omitted.

  As described above, in the radio communication system 100B according to the present embodiment, when the mobile station 21 whose radio system is the first radio system receives the first forced signal 423 transmitted from the first forced base station 54. Forcibly switches the wireless system for transmitting and receiving normal signals from the first wireless system to the second wireless system. In addition, when the mobile station 21 whose wireless system is the second wireless system receives the second forced signal 411 transmitted from the second forced base station 34, the wireless system for transmitting and receiving the normal signal is changed to the second wireless system. To forcibly switch to the first radio system. Therefore, even when at least one of the first notice signal 421 and the first confirmation signal 422 cannot be received, or when at least one of the second notice signal 413 and the second confirmation signal 412 cannot be received, the wireless system Switching leakage can be suppressed.

<Embodiment 3>
Hereinafter, the radio | wireless communications system which concerns on Embodiment 3 of this invention is demonstrated. The radio communication system according to the present embodiment unifies the radio scheme of the first switching base station that transmits the first switching signal with the first radio scheme, and the radio scheme of the second switching base station that transmits the second switching signal. Is a wireless communication system in which the second wireless system is unified.

  FIG. 7 is a diagram illustrating an example of an overall configuration of a wireless communication system 100C according to Embodiment 3 of the present invention. As shown in FIG. 7, in the wireless communication system 100C according to the present embodiment, the first forced base station 54 is replaced with the first forced communication base station 54 as compared with the wireless communication system 100B according to the second embodiment shown in FIG. A forced base station 33 is provided, and a second forced base station 53 is provided instead of the second forced base station 34.

  The first normal base station 30, the first notice base station 31, the first confirmed base station 32, and the first forced base station 33 are systematically synchronized on the first line 3D. The 1st forced base station 33 transmits the 1st forced signal 423 to the area | region 33a in the 2nd communication area 1b with a 1st radio system. Further, the second normal base station 50, the second notice base station 51, the second confirmed base station 52, and the second forced base station 53 are systematically synchronized on the second line 5D. The second forced base station 53 transmits the first forced signal 423 to the region 53a in the first communication area 1a by the second wireless method.

  FIG. 8 is a diagram showing an example of a configuration of a communication frame according to Embodiment 3 of the present invention. In FIG. 8, the configuration of a communication frame of communication performed between the first mobile station 21a and the first normal base station 30, the first notice base station 31, the first confirmed base station 32, and the first forced base station 33 is shown. Show. FIG. 8 also shows a block diagram showing the configuration of the first mobile station 21a.

  As shown in FIG. 8, the configuration of the communication frame in the communication between the first mobile station 21a and the first normal base station 30, the first foreseeing base station 31, and the first confirmed base station 32 in the present embodiment is as follows. As in the first embodiment, the mobile station 21 receives the first synchronization signal from the first normal base station 30 in the first communication area 1a, and receives the first normal base station 30 and the first notice base station. The signal is received by superframe synchronization with each of 31 and the first confirmed base station 32.

  On the other hand, since the first forced base station 33 transmits the first forced signal 423 outside the first communication area 1a, the mobile station 21 receives the first forced base station 30 from the first normal base station 30 in the area where the first forced signal 423 arrives. One synchronization signal cannot be received. Therefore, the mobile station 21 cannot receive the first forced signal 423 by performing superframe synchronization using the first synchronization signal from the first normal base station 30.

  Therefore, in the present embodiment, as shown in FIG. 8, the first forced base station 33 transmits the first synchronization signal and the first operation dummy signal at timings other than the frame Fj1 for transmitting the first switching signal. The first synchronization signal transmitted by the first forced base station 33 is the same as the first synchronization signal transmitted by the first normal base station 30, and the mobile station 21 transmits the first synchronization signal transmitted by the first forced base station 33. By receiving one synchronization signal, super-frame synchronization with the first forced base station 33 and the first wireless system can be performed even outside the first communication area 1a. The first operation dummy signal is a dummy signal transmitted from the first forced base station 33 instead of the first operation signal transmitted from the first normal base station 30, and the mobile station 21 receives the first operation dummy signal. However, it is not processed as an operation signal.

  Similar to the case where “first 1” and “second 2” are replaced in the description of the first compulsory base station 33, the second compulsory base station 53 uses the second radio system in the first communication area 1a. The second forced signal 411, the second synchronization signal, and the second operation dummy signal are transmitted to the area 53a. By receiving the second synchronization signal transmitted from the second forced base station 53, the mobile station 21 synchronizes with the second forced base station 53 and the second radio system in superframe synchronization even outside the second communication area 1b. can do.

  As described above, in the wireless communication system 100C according to the present embodiment, the first compulsory base station 33 can transmit a signal using a wireless method different from that of the second notice base station 51 and the second confirmed base station 52. It becomes. In addition, the second forced base station 53 can transmit a signal by a wireless method different from that of the first notice base station 31 and the first confirmed base station 32. Therefore, it is not necessary to shift the positions of these base stations. In addition, switching of the one-way wireless method (switching from the first wireless method to the second wireless method, or switching from the second wireless method to the first wireless method) can be realized by one type of wireless method.

<Embodiment 4>
Hereinafter, the radio | wireless communications system which concerns on Embodiment 4 of this invention is demonstrated. In the radio communication system according to the present embodiment, the function of the second switching base station that has transmitted the second switching signal in the second radio scheme in the third embodiment is used, and the first switching signal is transmitted in the first radio scheme. The number of switching base stations is reduced by integrating with the first switching base station to transmit.

  FIG. 9 is a diagram illustrating an example of an overall configuration of a radio communication system 100D according to Embodiment 4 of the present invention. As shown in FIG. 9, in radio communication system 100D according to the present embodiment, compared with radio communication system 100C according to Embodiment 3 shown in FIG. The base station 52 and the second compulsory base station 53 are not provided, and the functions of these base stations are integrated into the first compulsory base station 33, the first confirmed base station 32, and the first notice base station 31, respectively. Has been.

  The first normal base station 30, the first notice base station 31, the first confirmed base station 32, and the first forced base station 33 are systematically synchronized on the first line 3D. The first notice base station 31 transmits the first notice signal 421 and the second forced signal 411 by the first wireless method. The first confirmed base station 32 transmits the first confirmed signal 422 and the second confirmed signal 412 by the first wireless method. The first forced base station 33 transmits the first forced signal 423 and the second warning signal 413 by the first wireless method.

  In the present embodiment, the switching signal is classified into one of the first switching signal group 42 and the second switching signal group 41. The first switching signal group 42 includes a first notice signal 421, a first confirmation signal 422, and a first forcing signal 423. The second switching signal group 41 includes a second notice signal 413, a second confirmation signal 412, and a second forcing signal 411. Each of the first notice base station 31, the first confirmed base station 32, and the first forced base station 33 alternately transmits a signal belonging to the first switching signal group 42 and a signal belonging to the second switching signal group 41. To do. The timing for transmitting this signal will be described below.

  FIG. 10 is a diagram illustrating an example of a configuration of a communication frame according to Embodiment 4 of the present invention. In FIG. 10, the configuration of a communication frame for communication performed between the first mobile station 21 a and the first normal base station 30, the first notice base station 31, the first confirmed base station 32, and the first forced base station 33. Is shown. FIG. 10 also shows a block diagram showing the configuration of the first mobile station 21a.

  As shown in FIG. 10, the communication frame in the present embodiment has a superframe structure, and is divided into a superframe SF1 and a superframe SF2. Each of the first normal base station 30, the first notice base station 31, the first confirmed base station 32, and the first forced base station 33 transmits the superframe SF1 and the superframe SF2 alternately. Since the first normal base station 30, the first notice base station 31, the first confirmed base station 32, and the first forced base station 33 are synchronized on the first line 3D, the start timing SFt1 of the superframe SF1 is The base stations match, and the start timing SFt2 of the superframe SF2 also matches at each base station.

  The first normal base station 30 transmits the first operation signal and the first synchronization signal as the first normal signal at both timings of the superframe SF1 and the superframe SF2. Therefore, the mobile station 21 can receive the first operation signal and the first synchronization signal without considering the difference between the superframe SF1 and the superframe SF2, and the communication frame can be received by the superframe SF1 and the superframe SF2. There is no problem in operation due to the division.

  The first notice base station 31 transmits the first notice signal 421 belonging to the first switching signal group 42 in the frame Fj1 in the superframe SF1, and the first notice base station 31 belonging to the second switching signal group 41 in the frame Fj2 in the superframe SF2. 2 Force signal 411 is transmitted. The first confirmed base station 32 transmits the first confirmed signal 422 belonging to the first switching signal group 42 in the frame Fj1 in the superframe SF1, and the first belonging to the second switching signal group 41 in the frame Fj2 in the superframe SF2. 2 A confirmation signal 412 is transmitted.

  As described in the third embodiment, the first forced base station 33 needs to transmit the first operation dummy signal and the first synchronization signal except when the switching signal is transmitted in order to synchronize with the superframe. Therefore, in the super frame SF1, the first forcing signal 423 belonging to the first switching signal group 42 is transmitted in the frame Fj1, and the first operation dummy signal and the first synchronization signal are transmitted at other timings. In the super frame SF2, the second notice signal 413 belonging to the second switching signal group 41 is transmitted in the frame Fj2, and the first operation dummy signal and the first synchronization signal are transmitted at other timings.

  As described above, in radio communication system 100D according to the present embodiment, the function of the second switching base station that transmits the second switching signal in the second radio scheme in the third embodiment is the first radio scheme. By integrating the first switching base station that transmits one switching signal, the number of switching base stations can be halved compared to the third embodiment.

  In addition, by alternately transmitting the super frame SF1 and the super frame SF2, it is possible to realize a wireless communication system having the above effects without increasing the frequency even in a single wireless system.

  In the present embodiment, the case where the number of switching base stations is three by integrating the functions of the three second switching base stations into the three first switching base stations has been described as an example. It is not necessary to integrate all two second switching base stations with the first switching base station.

<Embodiment 5>
As described above, in the wireless communication system 100D according to the fourth embodiment, the first notice base station 31, the first confirmed base station 32, and the first forced base station 33 use the same frequency f1 and the mobile station 21. If the mobile unit 2 is in an interference zone where the signal from the first notice base station 31 and the signal from the first confirmed base station 32 interfere with each other, or the signal from the first confirmed base station 32 and the first When the mobile unit 2 is in an interference zone where a signal from one forced base station 33 interferes, the mobile station 21 randomly receives four types of switching signals transmitted from two adjacent base stations. there is a possibility.

  In this case, the mobile station 21 may not be able to correctly switch the radio system according to the communication area. Therefore, in the wireless communication system according to Embodiment 5, by restricting the state transition of the mobile station 21 in a short time such that the mobile body 2 passes through the interference zone, the wireless system can be used even when there is an influence of interference. Can be switched normally. Note that the configuration of the base station in the radio communication system according to Embodiment 5 is the same as that of radio communication system 100D according to Embodiment 4, and thus detailed description thereof is omitted.

  FIG. 11 is a diagram for explaining state transition of the mobile station 21 that is restricted in the interference zones 1d and 1e of the switching base station according to Embodiment 5 of the present invention. In FIG. 11, an interference zone 1 d indicates a zone where a signal from the first notice base station 31 interferes with a signal from the first confirmed base station 32. The interference zone 1e indicates a zone where the signal from the first confirmed base station 32 interferes with the signal from the first forced base station 33.

  As the state transition of the mobile station 21 in the interference zone 1d, the state transition t1 is the case where the first confirmation signal 422 is received after receiving the first notice signal 421, and the state transition t2 is the second forcing after receiving the first confirmation signal 422. When the signal 411 is received, the state transition t3 receives the first warning signal 421 after receiving the second forcing signal 411, and the state transition t4 receives the first warning signal 421 after receiving the second confirmation signal 412. Shows the case.

  Further, as the state transition of the mobile station 21 in the interference zone 1e, the state transition t5 is the case where the second confirmation signal 412 is received after receiving the second notice signal 413, and the state transition t6 is the state after the second confirmation signal 412 is received. When the first forcing signal 423 is received, the state transition t7 is when the second forcing signal 413 is received after receiving the first forcing signal 423, and the state transition t8 is for the second forcing signal 413 after receiving the first confirmation signal 422. Is shown.

  Among the state transitions t1 to t8, the state transition necessary for correctly switching the radio system of the mobile station 21 in the interference zone 1d is the state transition t1, and the radio system of the mobile station 21 is correctly switched in the interference zone 1e. The state transition necessary for switching is the state transition t5, and the state transitions t2 to t4 and t6 to t8 are unnecessary state transitions.

  Therefore, in the radio communication system according to the present embodiment, when the mobile station 21 randomly receives four types of switching signals, the interference zone is set so that the radio scheme of the mobile station 21 is not switched to an unintended scheme. State transitions t2 to t4 in 1d and state transitions t6 to t8 in the interference zone 1e are limited.

  First, the state transition in the interference zone 1d will be described. FIG. 12 is a diagram showing state transition of the mobile station 21 in the interference zone 1d according to Embodiment 5 of the present invention. When the mobile body 2 is present in the interference zone 1d, the mobile station 21 receives signals from the first notice base station 31 and the first confirmed base station 32 present on both sides of the interference zone 1d. There is a possibility of randomly receiving four types of switching signals of the second forcing signal 411, the first deterministic signal 422, and the second deterministic signal 412.

  At this time, the state transition occurs in the mobile station 21, as shown in FIG. 12, when the mobile station 21 is in the first standby state ST1, receives the first notice signal 421, and waits for the first confirmation signal. When the mobile station 21 transitions to the state ST7, when the mobile station 21 is in the first confirmed signal standby state ST7, receives the first confirmed signal 422 and transitions to the second standby state ST2, and when the mobile station 21 enters the second standby state ST2. When the mobile station 21 is in the state ST2 and receives the second forced signal 411 and transits to the first standby state ST1, and the mobile station 21 is in the second confirmed signal standby state ST8, the second forced signal 411 or the second confirmed signal There are four cases: a case where the signal 412 is received and a transition is made to the first standby state ST1.

  Further, the state transition t1 indicates a case in which the transition from the first standby state ST1 to the first confirmed signal standby state ST7 is followed by the transition to the second standby state ST2. The state transition t2 indicates a case where the state transitions from the first confirmation signal standby state ST7 to the second standby state ST2 and then transitions to the first standby state ST1. The state transition t3 indicates a case where the state transitions from the second standby state ST2 to the first standby state ST1 and then transitions to the first confirmed signal standby state ST7. A state transition t4 indicates a case where the transition from the second confirmed signal standby state ST8 to the first standby state ST1 is followed by the transition to the first confirmed signal standby state ST7.

  Among the state transitions t1 to t4 in which the state transition occurs twice in a short time when the moving body 2 moving between the first communication area 1a and the second communication area 1b exists in the interference zone 1d, Only the state transition t1 that transitions from the first standby state ST1 to the first confirmed signal standby state ST7 and then transitions to the second standby state ST2 is necessary to correctly switch the radio system.

  Next, the state transition in the interference zone 1e will be described. FIG. 13 is a diagram showing state transition of the mobile station 21 in the interference zone 1e according to Embodiment 5 of the present invention. When the mobile unit 2 is present in the interference zone 1e, the mobile station 21 receives signals from the first definite base station 32 and the first forced base station 33 that exist on both sides of the interference zone 1e. There is a possibility of randomly receiving four types of switching signals 422, the second confirmation signal 412, the first forcing signal 423, and the second notice signal 413.

  At this time, the state transition occurs in the mobile station 21, as shown in FIG. 13, when the mobile station 21 is in the second standby state ST2 and receives the second notice signal 413 and waits for the second confirmed signal. When the mobile station 21 transits to the state ST8, when the mobile station 21 is in the second confirmed signal standby state ST8 and receives the second confirmed signal 412 and transits to the first standby state ST1, the mobile station 21 enters the first standby state ST1. When the mobile station 21 is in the state ST1 and receives the first forced signal 423 and transits to the second standby state ST2, the mobile station 21 is in the first confirmed signal standby state ST7, and the first forced signal 423 or the first confirmed signal There are four cases: the case where the signal 422 is received and the state transits to the second standby state ST2.

  Further, the state transition t5 indicates a case where the state transitions from the second standby state ST2 to the second confirmed signal standby state ST8 and then transitions to the first standby state ST1. A state transition t6 indicates a case where the state transitions from the second confirmed signal standby state ST8 to the first standby state ST1 and then transitions to the second standby state ST2. The state transition t7 shows a case where the state transitions from the first standby state ST1 to the second standby state ST2 and then transitions to the second confirmed signal standby state ST8. The state transition t8 indicates a case where the transition from the first confirmed signal standby state ST7 to the second standby state ST2 is followed by the transition to the second confirmed signal standby state ST8.

  Among the state transitions t5 to t8 in which the state transition occurs twice in a short time when the moving body 2 moving between the first communication area 1a and the second communication area 1b exists in the interference zone 1e, Only the state transition t5 that transitions from the second standby state ST2 to the second confirmed signal standby state ST8 and then transitions to the first standby state ST1 is necessary to correctly switch the radio system.

  Therefore, in the radio communication system according to the present embodiment, state transitions t1 to t8 in which the state transitions shown in FIGS. 12 and 13 occur twice in a short time in which the moving body 2 exists in the interference zone 1d or 1e. Among these, the state transitions t2 to t4 and t6 to t8 other than the state transitions t1 and t5 for correctly switching the radio system are limited.

  FIG. 14 is a flowchart showing an operation in which the mobile station 21 according to Embodiment 5 of the present invention switches the radio system. As FIG. 14 shows, compared with the flowchart of FIG. 6 demonstrated in Embodiment 2, it further has step S15, S16.

  The process of step S15 is a wait process of x seconds. Here, x is a parameter of time representing a short time when the moving mobile body 2 exists in the interference zones 1d and 1e. The process of step S15 is inserted between the process of step S13 and the process of step S2. The process of step S16 is a wait process of y seconds. Here, y is a parameter of time representing a short time when the moving mobile body 2 exists in the interference zones 1d and 1e. The process of step S16 is inserted between the process of step S14 and the process of step S1.

  Since the state transitions t2 to t4 and t6 to t8 to be restricted are the state transitions including the switching of the wireless system among the two consecutive state transitions, the weight process is switched to the wireless system. By inserting after processing, wait processing is included in the initial state transition. In this case, since the mobile station 21 does not receive the next switching signal in a short time, the mobile station 21 does not shift to the second state transition. That is, the state transitions t2 to t4 and t6 to t8 are limited in transition.

  On the other hand, since the state transitions t1 and t5 for correctly switching the wireless system are the state transitions including the switching of the wireless system among the two consecutive state transitions, the wait process after the wireless system switching is in the state. Transitions t1 and t5 are not affected. Therefore, as shown in FIG. 14, the state transition t1 is performed by adding the wait process of x seconds in step S15 and the wait process of y seconds in step S16 after the radio system switching operation in steps S13 and S14, respectively. It is possible to restrict only the state transitions t2 to t4 and t6 to t8 that should be restricted.

  As described above, in the radio communication system according to the present embodiment, when the mobile unit 2 exists in the interference zones 1d and 1e between the switching base stations, the mobile station 21 randomly selects from the surrounding base stations. When the above signal is received, it is possible to suppress a phenomenon in which an unintended state transition occurs and the wireless system is not switched correctly.

  In the scope of the present invention, the embodiments can be freely combined, or the embodiments can be appropriately modified or omitted.

  1 route, 1a first communication area, 1b second communication area, 1c third communication area, 1d, 1e interference zone, 2 mobile body, 3D first line, 5D second line, 21 mobile station, 21a first mobile station , 21a1 first operation signal processing unit, 21a2 first synchronization signal processing unit, 21a3 first switching signal processing unit, 21b second mobile station, 21c switching unit, 21d determination unit, 21e storage unit, 30 first normal base station, 31 First Notice Base Station, 32 First Confirmation Base Station, 33, 54 First Forced Base Station, 41 Second Switch Signal Group, 42 First Switch Signal Group, 50 Second Normal Base Station, 51 Second Notice Base Station , 52 2nd confirmed base station, 53, 34 2nd forced base station, 411 2nd forced signal, 412 2nd confirmed signal, 413 2nd warning signal, 421 1st warning signal, 422 1st confirmed signal, 423 1st Control signal, F1~FN, Fj1, Fj2 frame, SF, SF1, SF2 super frame.

Claims (8)

A wireless communication system for performing wireless communication between a mobile station on a moving body and a plurality of base stations,
The plurality of base stations are
A first normal base station that transmits and receives normal signals to and from the mobile station in a first wireless system in a first communication area;
A second normal base station that transmits and receives the normal signal to and from the mobile station in a second radio system different from the first radio system in a second communication area;
A plurality of switching base stations that respectively transmit a plurality of switching signals,
A wireless communication system, wherein the mobile station switches a wireless method for transmitting and receiving the normal signal between the first wireless method and the second wireless method when receiving the plurality of switching signals in a regular manner. . The wireless communication system according to claim 1,
The plurality of switching base stations are
A first notice base station and a first confirmed base station that respectively transmit a first notice signal and a first confirmed signal as the switching signal;
A second notice base station and a second confirmed base station that transmit a second notice signal and a second confirmed signal as the switching signal, respectively,
The mobile station
When the first confirmation signal is received after receiving the first notice signal, the wireless method is switched from the first wireless method to the second wireless method;
A wireless communication system that switches the wireless system from the second wireless system to the first wireless system when receiving the second confirmation signal after receiving the second notice signal. A wireless communication system according to claim 1 or claim 2, wherein
The plurality of switching base stations include a first forcing base station and a second forcing base station that respectively transmit a first forcing signal and a second forcing signal as the switching signal,
The mobile station
When the first forced signal is received when the wireless method is the first wireless method, the wireless method is switched to the second wireless method;
A wireless communication system that switches the wireless method to the first wireless method when the second forced signal is received when the wireless method is the second wireless method. A wireless communication system according to claim 3,
The normal signal transmitted by the first normal base station includes a first synchronization signal for the mobile station to perform the wireless communication in the first wireless system,
The normal signal transmitted by the second normal base station includes a second synchronization signal for the mobile station to perform the wireless communication in the second wireless system,
The first forced base station transmits the first forced signal in the second communication area by the second wireless method,
The second forced base station transmits the second forced signal in the first communication area in the first wireless method,
The mobile station
In the second communication area, the first forced signal is received using the second synchronization signal transmitted by the second normal base station,
A wireless communication system, wherein, in the first communication area, the second forced signal is received using the first synchronization signal transmitted by the first normal base station. A wireless communication system according to claim 3,
The first compulsory base station includes a first compulsory signal in the second communication area in the first radio scheme, and a first for the first mobile station to perform the radio communication in the first radio scheme. Send sync signal and
The second forced base station has the second forced signal in the first communication area in the second wireless method and a second for the first mobile station to perform the wireless communication in the second wireless method. Send sync signal and
The mobile station
In the second communication area, the first forced signal is received using the first synchronization signal transmitted by the first forced base station,
A wireless communication system, wherein, in the first communication area, the second forced signal is received using the second synchronization signal transmitted by the second forced base station. The wireless communication system according to any one of claims 1 to 5,
The first wireless method and the second wireless method are wireless methods for performing the wireless communication in a unit frame composed of a plurality of frames,
The wireless communication system, wherein the normal signal and each of the plurality of switching signals transmitted by the same wireless method are assigned to different frames in the unit frame. The wireless communication system according to any one of claims 1 to 6,
The switching base station that transmits the first switching signal that is the switching signal for the mobile station to switch the wireless method from the first wireless method to the second wireless method is defined as a first switching base station;
The switching base station that transmits a second switching signal that is the switching signal for the mobile station to switch the wireless method from the second wireless method to the first wireless method is defined as a second switching base station;
The first wireless method and the second wireless method are wireless methods for performing the wireless communication in a unit frame composed of a plurality of frames,
At least one of the plurality of first switching base stations and at least one of the plurality of second switching base stations are the same switching base station,
The wireless communication system, wherein the same base station alternately transmits the first switching signal and the second switching signal for each unit frame in the first wireless method or the second wireless method. The wireless communication system according to any one of claims 1 to 7,
The mobile communication system, wherein the mobile station does not receive the plurality of switching signals within a predetermined time after performing the wireless system switching process.

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