JP2013179380A - Radio system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique that can secure both communication quality and transmission capacity regarding radio communication for a mobile body, especially a technique applicable to a fast moving mobile body.SOLUTION: A radio system 1 includes a prediction unit for predicting when and in which section of a plurality of communication sections 41 a mobile body 13 mounting a mobile station device 21 passes another mobile body by a predefined passing-each-other prediction method. A radio communication facility 31 dynamically performs switch control to switch a communication method such that a communication method with priority in communication quality will be used in a passing-each-other section 44 where the passing-each-other is predicted, and a communication method with priority in transmission capacity will be used in a non-passing-each-other section 45 according to a prediction result by the prediction unit. The mobile station device 21 uses the communication method with priority in communication quality within the passing-each-other section 44 and the communication method with priority in transmission capacity within the non-passing-each-other section 45.

Description

  The present invention relates to a radio system applicable to, for example, a train radio system.

  In a train radio system, a base station apparatus is connected to a leaky coaxial cable (hereinafter also referred to as LCX) installed along a track, and uses a LCX as a radio antenna to perform radio communication with a mobile station apparatus mounted on a train. I do. Generally, the LCX is installed on both sides of the line, and the LCX on both sides is used at the same time. In the case of a double track, LCXs are installed on the outside of the up line and the outside of the down line, respectively, and the LCXs on both sides are shared by the up and down trains.

  Here, when the upstream train and the downstream train pass each other, radio waves transmitted and received between the mobile station device of the upstream train and the downstream LCX are weakened or blocked by the downstream train. In this case, the mobile station device of the upstream train relies on the upstream LCX. In other words, the communication environment deteriorates due to the passing of the train. The same applies to the down train.

  For this reason, the conventional train radio system employs QPSK (Quadrature Phase Shift Keying) that operates at a low C / N (Carrier to Noise ratio) so that it can withstand the deterioration of the communication environment at the time of passing and ensure communication quality. It has been.

Japanese Patent No. 4666318 Japanese Patent No. 3593910

  In general, when a communication method with high communication quality (in other words, transmission quality) is adopted, the transmission capacity is kept low. For this reason, according to the conventional train radio system, a large transmission capacity cannot be expected even if communication quality can be ensured when passing each other. On the other hand, when the transmission capacity is increased, the communication quality deteriorates, that is, a transmission loss occurs as the communication environment deteriorates.

  For example, by monitoring radio wave interference and switching to a communication method that prioritizes communication quality when passing each other, the above problem may be solvable. However, such switching control is considered to be unsuitable when a moving body equipped with a mobile station device moves at high speed like a train. This is because if the switching of the communication method is started after the radio wave interference is detected, the switching may not be completed in time.

  An object of the present invention is to provide a technique capable of ensuring both communication quality and transmission capacity for wireless communication to a mobile body, and particularly to provide a technique applicable to a mobile body moving at high speed.

  A wireless system according to an aspect of the present invention includes a wireless communication facility that manages a plurality of communication sections corresponding to a plurality of wireless antennas installed at a predetermined location, and the wireless communication facility within the plurality of communication sections. A mobile station apparatus that performs wireless communication, and a prediction unit that predicts in which section of the plurality of communication sections a passing of a mobile body equipped with the mobile station apparatus occurs by using a predetermined passing prediction method. including. The wireless communication equipment uses a communication quality-priority communication method for a passing section in which a passing is predicted among the plurality of communication sections, and a non-passing in which a passing is not predicted in the plurality of communication sections. For the section, the communication system switching control to be used for the transmission capacity priority communication system is dynamically performed according to the prediction result of the prediction unit. The mobile station apparatus uses the communication quality priority communication method in the passing section and uses the transmission capacity priority communication method in the non-passing section.

  According to the above aspect, the communication method with priority on communication quality is used in the passing section, and the communication method with priority on transmission capacity is used in the non-passing section. For this reason, even when the communication environment deteriorates due to the passing of the mobile body, it is possible to reduce or avoid the deterioration of the communication quality and to communicate with a large transmission capacity in the non-passing section. Therefore, both the communication quality and the transmission capacity can be ensured as compared with the configuration in which the communication method is fixed.

  Further, since the passing section is predicted in advance, it becomes easy to complete the switching of the communication method before the moving body enters the passing section. Therefore, it is possible to provide a suitable radio system even when the mobile station apparatus is mounted on a moving body that moves at high speed.

  The objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.

1 is a diagram illustrating a wireless system according to Embodiment 1. FIG. 3 is a diagram illustrating installation of a leaky coaxial cable in the first embodiment. FIG. It is a figure which illustrates a mode that a communication area changes into a passing area and a non-passing area about Embodiment 1. FIG. 1 is a block diagram illustrating a central device according to a first embodiment. 2 is a block diagram illustrating a base station apparatus according to Embodiment 1. FIG. 2 is a block diagram illustrating a mobile station apparatus according to Embodiment 1. FIG. 3 is a flowchart illustrating the operation of the wireless system in the first embodiment. FIG. FIG. 10 is a block diagram illustrating a base station apparatus according to the second embodiment. FIG. 10 is a block diagram illustrating a mobile station apparatus according to a third embodiment. FIG. 10 is a block diagram illustrating a mobile station apparatus according to a fourth embodiment. FIG. 10 is a block diagram illustrating a base station apparatus in a first modification. FIG. 10 is a block diagram illustrating a wireless communication facility for a first modification. FIG. 11 is a block diagram illustrating a wireless communication facility for a second modification.

<Embodiment 1>
<Overview of wireless system>
FIG. 1 shows an example in which the radio system 1 according to Embodiment 1 is applied to a train radio system. However, the wireless system 1 can be applied to a mobile body (for example, an automobile) other than the train.

  In the example of FIG. 1, trains 13p, 13q, and 13r travel on the upstream line 11, and trains 13s and 13t travel on the downstream line 12. The train 13p may be composed of one vehicle or a plurality of vehicles. The same applies to the trains 13q to 13t.

  In addition, below, when not distinguishing the trains 13p-13t, the lowercase alphabet at the end of a code | symbol may be abbreviate | omitted and may be described as the train 13. Such a notation method is also adopted for other codes.

  In the wireless system 1, the mobile station devices 21p to 21t respectively mounted on the trains 13p to 13t perform wireless communication with the wireless communication facility 31. Unlike the mobile station device 21, the wireless communication facility 31 is fixedly installed on the ground. In the example of FIG. 1, the wireless communication facility 31 includes four base station devices 32ab, 32cd, 32ef, 32gh and a central station device 35. The number of base station devices 32 is not limited to the example of FIG.

  The base station apparatus 32ab has transmission / reception units 3201a and 3201b, and the transmission / reception units 3201a and 3201b are connected to leaky coaxial cables (hereinafter also referred to as LCX) 34a and 34b, respectively. The transceiver unit 3201a transmits and receives radio waves via the LCX 34a using the LCX 34a connected to the transceiver unit 3201a as an antenna. The same applies to the transmission / reception unit 3201b.

  Similarly, the transceiver units 3201c and 3201d of the base station device 32cd are connected to the LCXs 34c and 34d, the transceiver units 3201e and 3201f of the base station device 32ef are connected to the LCXs 34e and 34f, and the transceiver unit of the base station device 32gh. 3201g and 3201h are connected to LCX34g and 34h, respectively.

  Although illustrated schematically in FIG. 1, for example, the LCX 34 a is composed of an LCX 34 a 1 installed outside the upstream line 11 and an LCX 342 a 2 installed outside the downstream line 12 as illustrated in the overhead view of FIG. 2. Composed. Such a set of LCXs 34a1 and 34a2 is connected to the transmission / reception unit 3201a of the base station apparatus 32ab. The same applies to the other LCXs 34b to 34h.

  The LCX 34a (more specifically, the portion of the LCX 34a that functions as an antenna) is a portion of the plurality of sections 41 that divides the lines 11 and 12 (in other words, the movement path of the train 13) along the extending direction. Are installed along the tracks 11 and 12 in the predetermined section 41a. The other LCXs 34b to 34h are similarly installed in the predetermined sections 41b to 41h, respectively. In the example of FIG. 1, the section 41b is positioned on the right side of the section 41a, the section 41c is positioned on the right side of the section 41b, and the sections 41d, 41e, 41f, 41g, and 41h are arranged in order. . Corresponding to the arrangement order of the sections 41a, 41b, 41c, 41d, 41e, 41f, 41g, and 41h, LCXs 34a, 34b, 34c, 34d, 34e, 34f, 34g, and 34h are arranged in order. As described above, although simplified in FIG. 1, each of LCX 34a, 34b, 34c, 34d, 34e, 34f, 34g, and 34h is a set of both installed on the upstream side and the downstream side. Consists of LCX (see FIG. 2).

  Each section 41 is grasped as an installation section 41 of each LCX 34. Or you may grasp | ascertain each said area | region 41 as the communication area 41 which is the range which each LCX34 can transmit / receive a radio signal. These communication sections 41 are managed by the wireless communication facility 31.

  The boundaries of the section 41 are the base station inner boundaries 42ab, 42cd, 42ef, 42gh which are the boundaries of the installation section 41 of the LCX 34 connected to the same base station apparatus 32, and the installation of the LCX 34 connected to a different base station apparatus 32. It is roughly divided into base station boundaries 43bc, 43de, and 43fg that are boundaries of the section 41.

  Here, each LCX 34 is used when the mobile station apparatus 21 existing in its own installation section 41 performs wireless communication with the wireless communication facility 31. In the example of FIG. 1, for example, the LCX 34 a is used when the mobile station device 21 p mounted on the train 13 p existing in the installation section 41 a of the LCX 34 a communicates with the wireless communication facility 31. Further, for example, the LCX 34 f is used for wireless communication between the mobile station devices 21 r and 21 t and the wireless communication facility 31.

  In the example of FIG. 1, the central device 35 is connected to four base station devices 32 by wire or wirelessly, and communicates with the mobile station device 21 via, for example, the base station device 32 and the LCX 34. Further, for example, communication between the central apparatus 35 and the base station apparatus 32 (communication without radio wave output to the mobile station apparatus 21), communication between the base station apparatuses 32 via the central apparatus 35, base station apparatus Communication between the mobile station devices 21 via the central device 32 and the central device 35 is provided.

  According to such a configuration, for example, the central device 35 acquires and manages various information acquired by the base station device 32 and the mobile station device 21, and the base station device 32 and the various information held by the central device 45 It can be shared by the mobile station device 21.

  The base station device 32 may be configured to be able to communicate with other base station devices 32 without going through the central device 35. Further, the mobile station device 21 may be configured to be able to communicate with other mobile station devices 21 without going through the base station device 32, or without going through the base station device 32 and the central device 35.

  Further, the central device 35 performs various controls of the wireless system 1. As an example, in the following, in a communication section 41 including a place where the train 13 passes (in the example of FIG. 1, a communication section 41f including a place where the trains 13r and 13t pass each other), between the base station apparatus 32 and the mobile station apparatus 21 Control for switching the communication method to a method giving priority to communication quality will be described.

  Here, the communication section 41 including the place where the train 13 passes (in other words, the communication section 41 in which the passing of the train 13 occurs) is referred to as a passing section 44. Further, the communication section 41 in which no passing of the train 13 occurs is referred to as a non-passing section 45. When the passing section 44 is specified more specifically, the lowercase alphabet at the end of the code of the corresponding communication section 41 is used. That is, in the example of FIG. 1, the symbol 44f may be used for the passing section. The same applies to the non-passing section 45.

  Each communication section 41 is classified as either a passing section 44 or a non-passing section 45, and the classification dynamically changes as the train 13 moves. FIG. 3 illustrates a state in which the communication section 41a changes to a passing section 44 or a non-passing section 45 as time passes.

<Central device 35>
In order to realize the switching of the communication method, the central device 35 identifies the passing section 44 by predicting the passing of the train 13. A block diagram of the central device 35 is illustrated in FIG. According to the example of FIG. 4, the central device 35 includes an operation schedule acquisition unit 3501, an information acquisition unit 3502, a storage unit 3503, a prediction unit 3504, and a communication method control unit 3505.

<Operating schedule acquisition unit 3501>
The operation schedule acquisition unit 3501 acquires information related to the operation schedule of each train 13 (hereinafter also referred to as operation schedule information) from a predetermined information provider (for example, an operation command center). When the operation schedule information is appropriately updated at the information provider, the operation schedule acquisition unit 3501 monitors the update and acquires the latest operation schedule information. The operation schedule acquisition unit 3501 supplies the acquired operation schedule information to the storage unit 3503 and the prediction unit 3504.

  The operation schedule information includes, for example, information for identifying each train 13 (hereinafter also referred to as train identification information), planned or planned travel content (hereinafter also referred to as planned travel content), and the like. . The train identification information is, for example, a train number, and the scheduled traveling content includes, for example, a traveling position, a traveling time, and a traveling speed. Information included in the operation schedule information is associated. For this reason, for example, by setting the composition number as a search key and searching for operation schedule information, it is possible to extract the planned travel contents of the desired train 13. Further, for example, by setting the travel time as a search key, the travel position of each train 13 at a desired time can be extracted.

  Here, it is also possible to understand the operation schedule information as the movement schedule information of the mobile station device 21 mounted on the train 13. In that case, the train identification information corresponds to the mobile station identification information of each mobile station device 21, and the planned travel content corresponds to the planned travel content of the mobile station device 21.

<Information acquisition unit 3502>
The information acquisition unit 3502 acquires various types of information from each mobile station device 21 and each base station device 32, and supplies the acquired information to the storage unit 3503 and the prediction unit 3504. Hereinafter, information acquired from the mobile station device 21 is also referred to as mobile station information, and information acquired from the base station device 32 is also referred to as base station information.

  The mobile station information includes, for example, the train number of the train 13, information related to the actual travel of the train 13 (hereinafter also referred to as actual travel content), and information related to the communication state of the mobile station device 21 mounted on the train 13 (hereinafter referred to as the mobile station information). And so on). The actual traveling content includes, for example, the position and speed of the own train 13 detected during traveling, the detection time thereof, and the like. The actual traveling content may include, for example, information related to actual passing detection (hereinafter also referred to as passing detection information). The mobile station communication state includes, for example, a reception level, channel quality, detection time thereof, and the like. Information included in the mobile station information is associated. Therefore, for example, information detected at a desired time can be extracted by setting the detection time as a search key.

  The base station information includes, for example, information for identifying each base station device 32 (hereinafter also referred to as base station identification information) and information for identifying each transmitting / receiving unit 3201 in the base station device 32 (hereinafter referred to as base station). Information on the communication state of the base station device 32 (hereinafter also referred to as a base station communication state). The base station communication state includes, for example, a reception level, a line quality, a detection time thereof, and the like. Information included in the base station information is associated. Therefore, for example, information detected at a desired time can be extracted by setting the detection time as a search key.

<Storage unit 3503>
The storage unit 3503 accumulates operation schedule information supplied from the operation schedule acquisition unit 3501, and mobile station information and base station information supplied from the information acquisition unit 3502. More specifically, the storage unit 3503 constructs a database by associating the acquired information. For this reason, for example, by setting the train formation number as a search key, it is possible to extract the planned travel content and the actual travel content for the desired train 13. At this time, one or both of the mobile station communication state and the base station communication information associated with the actual traveling content can be extracted simultaneously.

<Prediction unit 3504>
The prediction unit 3504 predicts when the passing of the train 13 occurs in which communication section 41 using a predetermined passing prediction method, and supplies the prediction result to the communication system control unit 3505 and each base station device 32.

  Specifically, the prediction unit 3504 predicts the train 21 in which the passing occurs.

  Also, the prediction unit 3504 predicts a place where a passing place (hereinafter also referred to as a passing place) occurs, thereby predicting the communication section 41 including the passing place, that is, the passing section 44. For example, the information on the setting range of each communication section 41, in other words, the information on the installation range of each LCX 34 is stored in the storage unit 3503 or the like in advance, thereby grasping the correspondence between the predicted passing place and the communication section 41. Is possible.

  In addition, the prediction unit 3504 predicts a time when the passing occurs (hereinafter also referred to as a passing time). The passing time is defined as, for example, a period from the time when the passing starts to the time when the passing ends. Alternatively, the passing period may be defined as, for example, a period from the time when the state where both of the trains 13 predicted to pass each other exist in the passing section 44 to the end of the state. Other definitions may be used for the passing time.

  As a passing prediction method, for example, there is a method of predicting the occurrence of passing by comparing the planned traveling contents of each train 13 supplied from the operation schedule acquisition unit 3501. Alternatively, for example, the planned travel content may be corrected based on the actual travel content supplied in real time from the information acquisition unit 3502 and predicted from the corrected planned travel content. Alternatively, in addition to or instead of the real-time actual traveling content, the actual traveling content of the same schedule may be referred to in the past actual traveling content stored in the storage unit 3503. Thus, prediction accuracy can be improved by considering various information.

  Alternatively, for example, a method of predicting the occurrence of a passing by comparing the actual traveling content supplied in real time from the information acquisition unit 3502 without using the planned traveling content supplied from the operation schedule acquisition unit 3501 is adopted. May be. Also in this case, the past actual traveling content accumulated in the storage unit 3503 may be referred to. For example, when the reliability of the scheduled traveling content is reduced due to disturbance of the schedule, etc., the prediction accuracy can be ensured by not using the scheduled traveling content.

  A passing method other than those exemplified above may be adopted. Further, only one type of passing prediction method may be mounted on the prediction unit 3504, but a plurality of types of passing prediction methods may be mounted and switched appropriately.

  The prediction unit 3504 can predict the communication environment level in the passing section 44 by referring to the past mobile station communication state and base station communication state stored in the storage unit 3503, for example. Also, information other than the communication state, for example, information on the base station boundary 42, base station boundary 43, handover, equipment abnormality, weather (snow, snowfall, rain), etc. are acquired in real time, or further. May be stored in the storage unit 3503 or the like to be used for prediction of the communication environment level.

  Such prediction of the communication environment level can also be performed for the non-passing section 45. For this reason, for example, the non-passing section 45 may be predicted to deteriorate the communication environment due to factors other than passing.

<Communication method control unit 3505>
The communication method control unit 3505 determines a communication method to be used in each communication section 41 based on the prediction result by the prediction unit 3504.

  Specifically, the communication system control unit 3505 selects a communication system that prioritizes communication quality for the passing section 44. For example, when only one type of communication method for the passing section 44 is prepared, the communication method control unit 3505 selects the communication method. For example, when a plurality of types of communication methods are prepared for the passing section 44, the communication method control unit 3505 selects a communication method that can ensure communication quality according to the communication environment level predicted by the prediction unit 3504. select.

  In addition, the communication system control unit 3505 selects a communication system that prioritizes transmission capacity for the non-passing section 45. For example, when only one type of communication method for the non-passing section 45 is prepared, the communication method control unit 3505 selects the communication method. For example, when a plurality of types of communication methods are prepared for the non-passing section 45, the communication method control unit 3505 secures the communication quality according to the communication environment level predicted by the prediction unit 3504, and the transmission capacity. A communication method capable of increasing the number is selected.

  Communication quality and transmission capacity can be controlled by selecting a modulation method or the like. For example, the communication quality can be improved as the system operates at a low C / N, and the transmission capacity can be increased as the system requires a high C / N. In view of this point, communication system control is exemplified in which QPSK or 16QAM is selected in the passing section 44 and a multi-value scheme such as 64QAM is selected in the non-passing section 45.

  As described above, whether each communication section 41 becomes the passing section 44 or the non-passing section 45 dynamically changes as the train 13 moves. For this reason, since the prediction result by the prediction unit 3504 also dynamically changes, the communication method control unit 3505 dynamically switches the communication method of each communication section 41.

<Base station apparatus 32>
FIG. 5 illustrates a block diagram of the base station apparatus 32 according to the first embodiment. In order to avoid complication of the drawing, only one transmitting / receiving unit 3201 in the base station apparatus 32 is illustrated in FIG. According to the example of FIG. 5, the base station apparatus 32 includes a reception level detection unit 3202 and a line quality detection unit 3203 in addition to the transmission / reception unit 3201 described above.

  The transmission / reception unit 3201 transmits the prediction result input from the prediction unit 35 of the central device 35 to the mobile station device 21 via the LCX 34. The transmission / reception unit 3201 supplies the mobile station information received from the mobile station device 21 via the LCX 34 to the information acquisition unit 3502 of the central device 35. Further, as described above, the communication method of the transmission / reception unit 3201 is controlled by the communication method control unit 3505 of the central device 35.

  The reception level detection unit 3202 detects the reception level, for example, by measuring the intensity of the received radio wave, and notifies the central apparatus 35 of the detection result as information on the base station communication state. The line quality detection unit 3203 detects the line quality by detecting, for example, a bit error or a packet error of communication data, and notifies the central apparatus 35 of the detection result as base station communication state information.

<Mobile station apparatus 21>
FIG. 6 illustrates a block diagram of mobile station apparatus 21 according to Embodiment 1. According to the example of FIG. 6, the mobile station device 21 includes a transmission / reception unit 2101, an information acquisition unit 2102, a communication method control unit 2103, a position detection unit 2104, a speed detection unit 2105, and a reception level detection unit 2106. A line quality detection unit 2107, a passing detection unit 2108, and a composition number notification unit 2109.

  The transmission / reception unit 2101 transmits and receives radio waves via an antenna 1301 provided on the train 13. The information acquisition unit 2102 acquires the data received by the transmission / reception unit 2101, and supplies the prediction result to the communication method control unit 2103 when the prediction result by the prediction unit 3504 is included in the received data. The communication method control unit 2103 dynamically controls the communication method of the transmission / reception unit 2101 based on the acquired prediction result, similarly to the communication method control unit 3505 of the central device 35.

  The position detection unit 2104 detects the position of the own train 13 (in other words, the position of the mobile station device 21), and notifies the base station device 32 via the transmission / reception unit 2101 of the detection result as information on actual travel contents. The position information of the train 13 can be acquired from, for example, information about a kilometer available from the own train 13, a measurement result by GPS (Global Positioning System), and the like. The speed detection unit 2105 detects the traveling speed of the own train 13 (in other words, the traveling speed of the mobile station device 21), and notifies the base station device 32 via the transmission / reception unit 2101 as the actual traveling content information. To do. The speed information of the train 13 can be acquired from, for example, a speedometer of the train 13.

  The reception level detection unit 2106 detects the reception level, for example, by measuring the intensity of the received radio wave, and notifies the base station apparatus 32 of the detection result as information on the mobile station communication state. The channel quality detection unit 2107 detects channel quality by detecting, for example, bit errors, packet errors, etc. of communication data, and notifies the base station apparatus 32 of the detection results as mobile station communication status information.

  The passing detection unit 2108 detects the passing between the own train 13 and the other train 13 from, for example, a change in the communication status or an image taken from the outside of the train, and information on the passing detection result (classified as actual traveling content). To the base station apparatus 32 via the transmission / reception unit 2101.

  The composition number notification unit 2109 notifies the base station apparatus 32 of the composition number of the own train 13 via the transmission / reception unit 2101.

<Operation of Wireless System 1>
FIG. 7 illustrates an operation flow of the wireless system 1. According to the example of FIG. 7, the central device 35 acquires various types of information in step S351. Specifically, operation schedule information is acquired by the operation schedule acquisition unit 3501, and base station information and mobile station information are acquired by the information acquisition unit 3502. And the prediction part 3504 of the central apparatus 35 estimates the various information relevant to the passing of the train 13 (step S352). Steps S351 and S352 are executed periodically, for example.

  And the communication system control part 3505 of the central apparatus 35 selects the communication system of each communication area 41 based on the said prediction result (step S353), and the communication system of the base station apparatus 32 is switched according to the selection result (step S353). Step S324). Also, each mobile station device 21 acquires the prediction result, and the communication method control unit 2103 switches the communication method of the own device 21 based on the prediction result (steps S213 and S214).

  For example, the central device 35 transmits the communication method selection result by the communication method control unit 3505 to each mobile station device 21, and the communication method control unit 3505 of each mobile station device 21 determines its own device based on the received selection result. 21 communication methods may be controlled.

  According to the wireless system 1, a communication method with priority on communication quality is used in the passing section 44, and a communication method with priority on transmission capacity is used in the non-passing section 45. For this reason, even when the communication environment deteriorates due to the passing of the train 13, it is possible to reduce or avoid the deterioration of the communication quality, and it is possible to communicate with a large transmission capacity in the non-passing section 45. Therefore, both the communication quality and the transmission capacity can be ensured as compared with the configuration in which the communication method is fixed.

  Further, since the passing section 44 is predicted in advance, it becomes easy to complete the switching of the communication method before the train 13 enters the passing section 44. Therefore, the radio system 1 is also suitable when the mobile station device 21 is mounted on a moving body that moves at high speed like a train.

  In addition, since the prediction unit 3504 is provided in the central device 35, all communication sections 41 can be managed collectively by the central device 35. For this reason, the processing load of the base station apparatus 32 and the mobile station apparatus 21 can be reduced.

  In addition, although the case where the opposite trains 13 pass each other was illustrated above, the wireless system 1 can also be applied to a case where passing each other occurs while passing in the same direction.

<Embodiment 2>
In the first embodiment, the configuration in which the central device 35 performs the prediction of passing and the control of the communication method is illustrated. In Embodiment 2, an example will be described in which these processes are performed by the base station apparatus. FIG. 8 illustrates a block diagram of the base station apparatus 32B according to the second embodiment. FIG. 8 also shows only one transmission / reception unit 3201 in the base station apparatus 32B, as in FIG.

  According to the example of FIG. 8, the base station apparatus 32B includes an operation schedule acquisition unit 3211, an information acquisition unit, in addition to the transmission / reception unit 3201, the reception level detection unit 3202, and the line quality detection unit 3203 described in the first embodiment. 3212, a storage unit 3213, a prediction unit 3214, and a communication system control unit 3215.

  The operation schedule acquisition unit 3211 functions in the same manner as the operation schedule acquisition unit 3501 provided in the central device 35 in the first embodiment. The other elements 3212 to 3215 also function in the same manner as the elements 3502 to 3505 provided in the central device 35 in the first embodiment.

  8, the information acquisition unit 3212 acquires mobile station information from the transmission / reception unit 3201 for the mobile station device 21 that can communicate via the transmission / reception unit 3201, and the mobile station device that is not so. 21, mobile station information is acquired via the other base station device 32B and the central device.

  With this configuration, in the base station device 32B, it is possible to perform passing prediction and control of the communication method, similarly to the central device 35 according to the first embodiment.

  In addition, in order to cope with the train 13 entering from the communication section 41 managed by the adjacent base station device 32B, the adjacent base station device 32B mutually supplies various pieces of information known by itself. In this case, the communication between the base station devices 32B may be direct communication, or may be indirect communication via the central device 35.

  According to the radio system employing the base station device 32B, both communication quality and transmission capacity can be ensured as in the first embodiment. Further, according to the base station device 32B, since information exchange and control instructions between the base station device 32B and the central device are reduced, it is possible to shorten the processing delay time.

  Note that the base station device 32B having the prediction unit 3214 can be mixed with a base station device not having the prediction unit 3214 (for example, the base station device 32 according to Embodiment 1). For example, some base station apparatuses (base station apparatus 32B) use the prediction unit 3214 provided therein, and the remaining base station apparatuses that do not have the prediction unit 3214 use the prediction unit 3504 of the central apparatus 35. In this way, a wireless system may be configured.

<Embodiment 3>
In the first embodiment, the configuration in which the central device 35 performs the prediction of passing and the control of the communication method is illustrated. In Embodiment 3, an example will be described in which these processes are performed by a mobile station apparatus. FIG. 9 illustrates a block diagram of mobile station apparatus 21C according to Embodiment 3.

  According to the example in FIG. 9, the mobile station device 21 </ b> C includes a storage unit 2113 and a prediction unit 2114 in addition to the elements 2101 to 2109 described in the first embodiment.

  The storage unit 2113 functions in the same manner as the storage unit 3503 provided in the central device 35 in the first embodiment. The prediction unit 2114 functions in the same manner as the prediction unit 3504 provided in the central device 35 in the first embodiment.

  In the example of FIG. 9, the mobile station device 21 </ b> C does not have the operation schedule acquisition unit 3501 provided in the central device 35 in Embodiment 1, but the operation schedule information is acquired by the central device 35, for example. It is distributed to each mobile station device 21C. According to this, also in the mobile station device 21 </ b> C, the operation schedule information can be used by the prediction unit 2114 and can be accumulated by the storage unit 2113.

  Also, according to the mobile station device 21C, the information acquisition unit 2102 acquires the mobile station information of the own device 21C from the position detection unit 2102 of the own device 21 and the mobile station information of the other device 21C via the transmission / reception unit 2101. Get. The communication between the mobile station devices 21C may be direct communication, or may be indirect communication via a base station device or via a base station device and a central device.

  With this configuration, in the mobile station device 21C, it is possible to perform passing prediction and control of the communication method, similarly to the central device 35 according to the first embodiment.

  Note that, for example, the base station apparatus matches the communication system with the mobile station apparatus 21C by the communication system control section of the base station apparatus functioning similarly to the communication system control section 2103 of the mobile station apparatus 21 according to Embodiment 1. Is possible. However, since each communication section 41 employs a single communication method, the base station apparatus and all mobile station apparatuses involved in the same communication section 41 need to have the same communication method. In such a case, for example, the base station device may grasp the communication method of each mobile station device and arbitrate the communication method to be used.

  According to the radio system employing the mobile station device 21C, both communication quality and transmission capacity can be ensured as in the first embodiment. Further, according to the mobile station device 21C, as in the second embodiment, since information exchange and control instructions between the base station device and the central device are reduced, it is possible to shorten the processing delay time. .

  Note that the mobile station device 21C having the prediction unit 2114 can be mixed with a mobile station device not having the prediction unit 2114 (for example, the mobile station device 21 according to Embodiment 1). For example, some mobile station devices (mobile station device 21C) use the prediction unit 2114 provided therein, and the remaining mobile station devices that do not have the prediction unit 2114 are the prediction unit 3504 or the base station of the central device 35. The wireless system may be configured to use the prediction unit 3214 of the device 32B.

<Embodiment 4>
In the fourth embodiment, as in the third embodiment, an example in which a mobile station apparatus performs prediction of passing and control of a communication method will be described. FIG. 10 illustrates a block diagram of mobile station apparatus 21D according to Embodiment 4.

  According to the example in FIG. 10, the mobile station device 21 </ b> D includes a prediction unit 2124 in addition to the elements 2101 to 2109 described in the first embodiment. The prediction unit 2124 acquires the actual traveling content at the time of passing from the train 13 in which the passing occurred first, and predicts the passing of the own train 13 on which the own device 21D is mounted based on the acquired actual traveling content.

  Specifically, when the passing detection unit 2108 detects a passing, the mobile station device 21D transmits information related to the passing to the mobile station device 21D of the subsequent train 13. For example, the position detection unit 2104 and the speed detection unit 2105 output the detection result, and the composition number notification unit 2107 outputs the composition number, so that the actual traveling content is transmitted via the transmission / reception unit 2101. In the succeeding mobile station device 21D, the actual traveling content of the preceding mobile station device 21D is received by the transmission / reception unit 2101 and the information acquisition unit 2102 and delivered to the prediction unit 2124. Then, the prediction unit 2124 predicts a passing between the train 13 and the own train 13 in which the preceding train 13 has passed based on the received actual traveling content and the actual traveling content of the own device 21D. The prediction result is notified to the communication system control unit 2103.

  The communication between the mobile station devices 21D may be direct communication, or may be indirect communication via the base station device or via the base station device and the central device.

  With this configuration, it is possible to perform passing prediction and communication system control in the mobile station device 21D.

  According to the radio system employing the mobile station device 21D, both communication quality and transmission capacity can be ensured as in the first embodiment. In addition, according to the mobile station device 21D, since the actual traveling content is mainly used, the mobile station device 21D is not easily affected by the disturbance of the operation schedule.

  Note that the mobile station device 21D having the prediction unit 2124 can be mixed with the mobile station device 21C having the prediction unit 2114 according to Embodiment 3. Also, the mobile station device 21C having the prediction unit 2114 can be mixed with a mobile station device that does not have the prediction unit 2114 (for example, the mobile station device 21 according to Embodiment 1).

<Modification 1>
According to the first to fourth embodiments, the communication method is controlled in units of 41 communication sections. For this reason, if the communication section 41 is divided finely, for example, it becomes possible to deal with a difference in communication environment more finely.

  In order to shorten the communication section 41, it is only necessary to shorten the antenna portion of LCX 34 (portion installed along lines 11 and 12). For example, the installation interval between base station devices may be narrowed. Alternatively, as illustrated in FIG. 11, if a base station device 32E equipped with a larger number of transmission / reception units 3201 is employed, the number of installed base station devices can be suppressed. Alternatively, as in the wireless communication facility 31F illustrated in FIG. 12, a control device 36 is interposed between the central device 35 and the base station device 32, and each control device 36 is responsible for a plurality of base station devices 32. Good. According to this, installation of the base station apparatus 32 becomes easy.

<Modification 2>
The above-described various configurations can also be applied to a case where a wireless communication area is formed using an antenna other than LCX (for example, a spatial wave train radio system). In the example of FIG. 13, a mode that each base station apparatus 32G of the radio | wireless communication equipment 31G forms a radio | wireless communication area is shown typically.

<Modification 3>
It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  1 wireless system, 13, 13p to 13t train (mobile), 21, 21C, 21D, 21p to 23t mobile station apparatus, 31, 31F, 31G wireless communication equipment, 32, 32E, 32G, 32ab, 32cd, 32ef, 32gh Base station equipment, 34, 34a-34h Leaky coaxial cable (antenna), 35 Central equipment, 41, 41a-41h Communication section, 44, 44f Passing section, 45, 45a-45e, 45g, 45h Non-passing section, 2113, 3213 , 3503 storage unit, 2114, 2124, 3504, 3214 prediction unit.

Claims (7)

A wireless communication facility for managing a plurality of communication sections corresponding to a plurality of wireless antennas installed in a predetermined place;
A mobile station device that performs wireless communication with the wireless communication facility within the plurality of communication sections;
A prediction unit that predicts in which section of the plurality of communication sections a passing of a mobile body equipped with the mobile station device occurs by using a predetermined passing prediction method;
The wireless communication equipment uses a communication quality-priority communication method for a passing section in which a passing is predicted among the plurality of communication sections, and a non-passing in which a passing is not predicted in the plurality of communication sections. For the section, the communication system switching control to be used for the transmission capacity priority communication system is dynamically performed according to the prediction result of the prediction unit,
The mobile station apparatus uses the communication quality priority communication method in the passing section, and uses the transmission capacity priority communication method in the non-passing section.
Wireless system. The wireless communication facility is:
A plurality of base station devices that perform wireless communication with the mobile station device;
A central device connected to the plurality of base station devices,
The wireless system according to claim 1, wherein the prediction unit is provided in the central device. The wireless communication facility is:
A plurality of base station devices that perform wireless communication with the mobile station device;
A central device connected to the plurality of base station devices,
The radio system according to claim 1, wherein the prediction unit is provided in at least a part of the plurality of base station apparatuses.   The radio system according to claim 1, wherein the prediction unit is provided in the mobile station apparatus.   The passing prediction method acquires the scheduled traveling content of the moving body, acquires the actual traveling content of the moving body in real time, and corrects the scheduled traveling content with the actual traveling content. The wireless system according to any one of claims 1 to 4, which is a method for predicting a passing by comparing in (5). A storage unit for accumulating the actual traveling content of the mobile body;
The wireless system according to claim 5, wherein the passing prediction method is a method of predicting passing by referring to the actual traveling content stored in the storage unit. The prediction unit is provided in the mobile station device,
The passing prediction method acquires the actual traveling content at the time of passing from the mobile station device mounted on the mobile body in which the passing occurred first, and the own device is mounted based on the acquired actual traveling content. It is a method to predict the passing of moving objects,
The wireless system according to claim 1.

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