WO1998051110A1 - Systeme de radiocommunication pour train et emetteur/recepteur radio afferent - Google Patents

Systeme de radiocommunication pour train et emetteur/recepteur radio afferent Download PDF

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Publication number
WO1998051110A1
WO1998051110A1 PCT/JP1998/002028 JP9802028W WO9851110A1 WO 1998051110 A1 WO1998051110 A1 WO 1998051110A1 JP 9802028 W JP9802028 W JP 9802028W WO 9851110 A1 WO9851110 A1 WO 9851110A1
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WO
WIPO (PCT)
Prior art keywords
base station
burst signal
communication system
wireless
station
Prior art date
Application number
PCT/JP1998/002028
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English (en)
Japanese (ja)
Inventor
Atsushi Ogino
Hideya Suzuki
Nobukazu Doi
Original Assignee
Hitachi, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi, Ltd. filed Critical Hitachi, Ltd.
Priority to JP54792398A priority Critical patent/JP3914268B2/ja
Publication of WO1998051110A1 publication Critical patent/WO1998051110A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies

Definitions

  • the present invention relates to a train radio communication system.
  • the present invention relates to a train radio communication system that communicates between a train traveling at high speed on a track and a train management station on the ground by relaying a radio base station arranged along the track.
  • train operation management systems using traffic lights are used in railway transportation.
  • This signal system detects the train's presence by passing current on the track and shorting the track by the train axle.
  • the management station (control device) transmits operation control information based on the detected information to the train using signals provided for each predetermined section.
  • Such a signal system requires a large amount of ground equipment, and the unit of operation management is limited to the track circuit length and the interval provided by the signal. Have difficulty.
  • a train control method by radio which can transmit operation control signals to many trains at high speed, has simple ground equipment, and is easy to maintain (for example, Japanese Patent Laid-Open No. 1 0 9 7 7 0).
  • a wireless line is provided between a train and a management station, and the management station sends an operation control signal to the train through the wireless line based on positional information from each train.
  • a single frequency wireless system disclosed in Japanese Patent Application Laid-Open No. 5-83181
  • a relay system In this method, a burst signal from one base station is sequentially and time-divisionally relayed by radio transceivers arranged at substantially equal intervals along a track and transmitted to a train.
  • This method eliminates the need for a wired connection between the base station and each wireless transmitting and receiving device by performing wireless relay, and eliminates the need for frequency switching in each wireless section by using a single frequency.
  • the management station Since multiple trains are on the track, the management station needs to communicate with different trains within a certain time.
  • the conventional method does not include, as a first problem, a configuration in which burst signals from a plurality of trains to the management station do not overlap.
  • the second problem is that the next signal cannot be transmitted unless the burst signal is relayed for a certain distance and the radio wave is attenuated. Therefore, it was difficult to communicate with many trains in a short time.
  • the mobile station and the base station are allocated to each other.
  • a burst signal is transmitted and received at a predetermined frequency
  • the track is divided into a management section for managing the operation of the train on the track, and the first mobile station on the management section is a burst signal.
  • Figure 1 shows an example of the configuration of a train operation management system.
  • FIG. 2 is a diagram showing a time division multiple access network constituted by the radio stations.
  • FIG. 3 is a diagram showing a first embodiment of time slot allocation to wireless stations.
  • FIG. 4 is a diagram showing a second embodiment of allocating time slots to radio stations.
  • FIG. 5 is a diagram showing a third embodiment of time slot allocation to wireless stations.
  • FIG. 6 is a diagram showing the antenna directivity of the radio base station in the third embodiment.
  • C FIG. 7 is a diagram showing a configuration example of a radio transmitting / receiving device of the radio station.
  • FIG. 8 is a diagram showing a format example of a burst signal.
  • FIG. 9 is a diagram showing the principle of the time slot allocation method of the present invention.
  • FIG. 10 shows another configuration example of the train operation management system.
  • FIG. 11 is a diagram showing the principle of the time slot allocation method of the present invention.
  • FIG. 12 is a diagram showing time slot allocation when performing double relay at a radio base station. BEST MODE FOR CARRYING OUT THE INVENTION
  • Fig. 1 shows the system configuration of the train operation management system.
  • Trains 20 A to 20 C move on track 10.
  • Each train is equipped with a radio transceiver 21 and an antenna 22 respectively.
  • Track 10 is divided into control sections 11A and 11B, and control stations 40A and 40B installed in each control section manage the operation of trains moving in the control sections.
  • Radio base stations 30 C to 30 E and 30 J to 30 L are arranged at appropriate intervals on the side of the orbit 10.
  • Each wireless base station includes a wireless transmitting / receiving device 31 and an antenna 32.
  • the management stations 40A and 40B are connected to one radio base station 30D and 30K in the management section.
  • the management station establishes a communication line with the train in each management section by wirelessly relaying the wireless base station in each management section. Before the train establishing the communication line goes to the adjacent management section or before the train in the adjacent management section newly enters its own management section, the management station in the corresponding adjacent management section And perform a series of handshakes to transfer the management of the train.
  • each train 20 is called a mobile station, and the mobile station 20 and the radio base station 30 are collectively called a radio station.
  • each radio station forms a time-division multiple access network that is all synchronized in time.
  • the node of the network is a radio station, and the node “N” is a communication path between the radio stations.
  • a first signal is transmitted and received on the communication path between the radio stations.
  • Each wireless base station 30 forms a wireless communication path with a wireless base station adjacent to the direction 10 A and the direction 10 B along the orbit 10.
  • the wireless base station 3OF has a wireless communication path with the wireless base station 30G in the direction 10OA, and has a wireless communication path with the wireless base station 30E in the direction 10B.
  • the mobile station 20 moving on the orbit 10 has a wireless communication path with any one of the adjacent wireless base stations 30.
  • the mobile station 2OA has a wireless communication path with the wireless base station 30G.
  • Each wireless station is assigned a periodically repeated time slot, and transmits and receives a burst signal between the wireless stations via a wireless communication channel.
  • Each station is assigned The burst signal is transmitted in the time slot.
  • the radio base station 30D transmits a burst signal in the direction 10A to the adjacent radio base station 30E at the time slot T1 and the adjacent radio base station 30E at the time slot T8.
  • Time slot T9 is a slot allocated for transmitting a burst signal from mobile station 20 to the radio base station.
  • the same time slot is allocated to a radio station located far enough away that the radio interference from the radio station does not affect the radio.
  • the time slot T1 assigned to the radio base station 30D is also assigned to the radio base station 30H located far enough.
  • a burst signal flow in both directions along the track is formed.
  • the time slots Tl, ⁇ 3, ⁇ 5, ⁇ 7 form a flow of a burst signal that is sequentially relayed in the direction 10 ⁇ by each radio base station, and the time slots T2, ⁇ 4, ⁇ 6, ⁇ 8 Forms a flow of a burst signal that is sequentially relayed in the direction 10 ° by each wireless base station.
  • the mobile station 20 in the management section receives a burst signal relayed from a radio base station connected to the management station in the management section from the nearest radio base station, and receives a burst signal from the management station in the management section. Communication to the mobile station is established. In the communication from the mobile station to the management station, a burst signal is transmitted to the nearest wireless base station in the time slot to which the mobile station is assigned, and the burst signal is relayed to the wireless base station connected to the management station. It is established by doing.
  • FIG. 3 shows a first embodiment of time slot allocation in the management section 11 1.
  • the horizontal axis indicates the control section (11Z, 11A to 11C).
  • Each management section has a management station 40.
  • the management section 11A includes the radio base stations 30A to G, 11B includes the radio base stations 30H to N, and the management stations 40A and 40B are the radio base stations, respectively.
  • the vertical axis indicates time, which is divided into time slots (Tl, T-).
  • Each radio base station transmits a bar to the adjacent radio base station in the assigned time slot.
  • the burst signal flow is formed bidirectionally (10 A, 1 OB) along the orbit.
  • the burst signal includes a downlink signal transmitted from the management station 40 to the train 20 and an uplink signal transmitted from the train 20 to the management station 40. Time slot allocation must meet the following conditions.
  • Train operation control is feedback control based on the transmission of operation control information from the management station and the return of operation information from the train. Therefore, no matter where the train is located, it is necessary to complete the transmission of the operation control information from the management station to the train and the return of the operation information from the train to the management station within a predetermined period.
  • This predetermined cycle that is, a cycle in which communication between the management station and the train for one train is completed is referred to as a “unit cycle”.
  • the management station transmits operation control information from the management station to the trains for all the trains on the track within a predetermined period.
  • the operation information must be returned from the train to the management station.
  • This predetermined period that is, the period in which the management station transmits to all the trains that can be on the line in one management section (or the period in which all the trains that can be on the line transmit to the management station) is a “communication period” Called. Therefore, the “communication cycle” is always shorter than the operation control cycle (the cycle at which the management station sends operation control information to each train). 2 Burst signal strength relayed by each radio base station ⁇ No accumulation in radio base station
  • burst signals are accumulated in the wireless base station, there is a possibility that communication between the management station and the train will not be completed within the communication cycle.
  • each radio base station needs to complete the relay process to the adjacent radio base station from the generation of the burst signal to be communicated to the generation of the next burst signal.
  • condition (1) is obtained by repeating the above 14 times (ie, twice the number of wireless base stations in the management section). The communication between the management station and the train is completed. Therefore, it is sufficient that each wireless base station is assigned a time slot such that relay processing is performed at least once for each of the wireless base stations adjacent in both directions along the track within one unit period.
  • each wireless base station When one time slot is required for one relay process, each wireless base station is required to transmit in one direction (1 OA) along the orbit and to transmit in the opposite direction (10 B). Each time one transmission time slot is allocated, at most one mobile station transmission time slot is allocated.
  • Fig. 3 allocates time slots according to the principle of time slot allocation shown in Fig. 9.
  • frequencies are reused at radio base stations that are far enough away from signal interference.
  • a maximum of three trains will be on the managed section.
  • one communication cycle is 27 time slots, and one unit cycle is 17 time slots.
  • Each wireless station operates in time synchronization.
  • the time slots assigned to the mobile station are T9, ⁇ 18, ⁇ 27.
  • the time slots forming one unit period for each mobile station are indicated by symbols.
  • the mobile station ⁇ using the time slot ⁇ 9 receives the downlink signal (operation control information) at one of the time slots of the burst signal flow indicated by the symbol a.
  • an upstream signal (operation information) is transmitted in one of the time slots of the flow of the burst signal indicated by the symbol a '.
  • mobile station A always completes communication using T1 to T17 (one unit cycle).
  • mobile station ⁇ always completes communication using ⁇ 10 to ⁇ 26.
  • the frequency is reused at radio base stations that are far away.
  • every four wireless base stations are reused.
  • wireless base stations do not necessarily need to be located at equal distances, and should not be reused at equally spaced base stations. There is no need to be.
  • the radio base station connected to the management station is arbitrary as long as it is a radio base station in the management section. Since the operation control system shown in Fig. 3 uses a single frequency, the relay operation from the wireless base station 30D to 30E takes place in the time slot where 30E to G perform the relay operation. Cannot be performed because of signal interference.
  • relay processing is sequentially arranged, and the wireless base station 30D can perform relay processing to 30 ° at the time slots T1, T10, and T19.
  • a burst signal is transmitted and received from the radio base station 30G belonging to the management section 11A to the radio base station 30H belonging to the management section 11B.
  • the time slot at which the mobile station generates a burst signal can be set appropriately in each management section.
  • FIG. 4 shows a second embodiment of the time slot allocation method.
  • the communication cycle is shortened by using a plurality of frequencies as an operation control system.
  • Each base station transmits the next signal at a different frequency F2 without waiting for the signal transmitted at the frequency F1 to be relayed far enough. Since signals of different frequencies do not become interference waves, the communication cycle can be shortened. However, the transmitted burst signal uses the same frequency for transmission and reception. A maximum of three trains can be accommodated in the control section. In this case, one communication cycle is 15 time slots and one unit cycle is 19 time slots.
  • the time slots forming one unit period for each mobile station are indicated by symbols.
  • mobile station A always completes communication using T1 to T19 ( ⁇ 4 after one communication cycle) (one unit cycle).
  • mobile station ⁇ ⁇ always completes communication using ⁇ 6 to ⁇ 24 c.
  • Te transmits a burst signal
  • the radio base station 3 0 E is then c receives the same signal
  • the radio base station 3 0 E is the signal received at timeslot T 1 to frequencies F 1 at timeslot T 3 Relay.
  • the radio base station 30 D again sends a burst signal at frequency F2 in the 1 OA direction along the orbit. In this case, since the transmission signal from base station 30D and the transmission signal from base station 30F have different frequencies, no interference occurs.
  • FIG. 5 shows a third embodiment of the time slot allocation method.
  • each radio station shortens the communication cycle by using an antenna capable of selecting and switching the directivity in each orbit direction.
  • each radio base station selects and uses an antenna whose gain in the direction in which the burst signal flows is greater than the gain in the opposite direction, and uses the antenna in the direction in which the burst signal arrives when receiving the burst signal. Select and use an antenna whose gain is greater than the gain in the opposite direction.
  • the example in Fig. 5 can also support up to three trains on the managed section, with one communication cycle of 15 time slots and one unit cycle of 19 time slots.
  • the base station 30D transmits a burst signal with an antenna having directivity in the direction of 10A along the orbit at the time slot T1, and the base station 30E transmits the signal in the direction of 10B along the orbit. The same signal is received by an antenna having directivity.
  • the base station 30E transmits the received signal in a time slot T3 using an antenna having directivity in the 1 OA direction along the orbit, and the radio base station 3OF transmits the 10
  • the same signal is received by an antenna that has directivity in the B direction.
  • each radio base station performs transmission and reception by selecting the antenna directivity in the traveling direction and arrival direction of the burst signal. An example of transmission and reception of a burst signal in the time slot T6 will be described.
  • the antenna is not directional, the signal transmitted from base station 30D and the signal transmitted from base station 30F at base station E will cause interference. As shown in Fig. 6, by giving the antenna directivity, the base station 30E The signal from base station 30F is suppressed, and the signal from base station 30D can be received. By using a directional antenna in this way, communication with a greater number of mobile stations per unit time is possible.
  • FIG. 7 shows an example of the configuration of the wireless transmitting / receiving device of each wireless station.
  • the wireless transmission / reception device includes an antenna unit 50, a transceiver 60, and a wireless control unit 70.
  • 51A and 51B are antennas. Space diversity can be implemented with multiple antennas.
  • the antennas 51A and 51B have different directional characteristics.
  • the antenna switching device 52 selectively switches an antenna coupled to the transceiver 60 by a switching signal from the timing synchronization circuit 73.
  • the transceiver 60 has a high-frequency unit 61 and a baseband unit 62.
  • the high frequency unit 61 performs power amplification, filtering, and frequency conversion.
  • the radio frequency to be converted is switched so as to be different for each transmission by the switching signal from the timing synchronization circuit 73.
  • the baseband unit 62 executes modulation / demodulation of a burst signal and coded Z decoding for error control.
  • the radio control unit 70 performs transmission and reception in addition to time synchronization processing with another radio station, generation of a transmission burst signal, and processing of a reception burst signal, which are the processing necessary to form the flow of the burst signal described above. It controls and monitors the machine 60 and connects to external input / output devices. Each component of the wireless control unit 70 will be described.
  • the timing synchronization circuit 73 provides synchronization timing for performing the relay process in synchronization with another wireless station, and in the case of the second and third embodiments described above, the antenna and the radio frequency switching signal are respectively transmitted.
  • the antenna unit 50 and the transceiver 60 are provided.
  • the control device 71 transfers a burst signal to and from the transceiver 60 via the buffers 72A and 72B. In response to the reception of the received burst signal, (1) correction of the synchronization timing specified by the timing synchronization circuit (73), (2) processing of the received burst signal, and (3) generation of the transmission burst and the signal to be relayed. In addition, control the transceiver 60 * Monitor.
  • the storage device 74 stores time slot allocation information, system information of each wireless station, and burst signals to be relayed.
  • the external input / output interface 75 Used to connect to an external input / output device when wirelessly transmitting burst data from the input / output device or when transmitting wireless burst data to an external input / output device.
  • Fig. 8 shows an example of the format of the burst signal.
  • the burst signal includes the following components in addition to the data 87.
  • the preamble 81 is used for synchronous timing recovery and carrier recovery.
  • Time slot number 82 is used to identify the time slot occupied by the burst signal.
  • the source ID 83 is for specifying the source radio station, and the destination ID 84 is for specifying the destination radio station.
  • the source time stamp 85 is provided so that the time sequence of the generation of the burst signal in the source wireless station can be identified.
  • the relay time stamp 86 indicates the transmission time when the wireless base station relays and transmits the burst signal.
  • the check bit 88 is used to check whether there is an error in the burst signal.
  • the operation control system has a reference clock, and there is at least one radio base station that transmits a burst signal based on the reference clock. Usually, this is the radio base station connected to the management station. Which radio base station has this reference clock is stored in the storage device 74 of the radio transmission / reception device. Note that the following description is made in accordance with the example of FIG. 3, and it is assumed that only the base station 30D has a reference connection.
  • a radio station (30E, etc.) that can directly receive a burst signal from the radio base station 30D having the reference port is a time slot number 8 included in the burst signal from the base station 30D.
  • the timing can be adjusted by calculating in advance the delay time required to receive the burst signal transmitted by the base station 30D.
  • the radio base station stores the time allocated to the storage device 74 of the onboard radio transceiver.
  • the slots and the radio base stations that transmit and receive burst signals in the time slots are registered.
  • the radio transceiver uses the check bit 88 to detect or correct an error in the burst signal each time the burst signal is received. If an uncorrectable error is detected in the burst signal as a result of error detection, this is discarded. If there is no error or correction and it is necessary to relay, refer to the destination ID 84 in the burst signal and store it in the storage device 74 for each assigned time slot number 82 to be transmitted next .
  • a burst signal for the same time slot number is already stored in the storage device 74. In this case, one of them is selected and stored based on the source ID 83, the destination ID 84, and the source time stamp 85. Specifically, if the stored burst signal is a burst signal relayed one communication cycle before, it is determined by the source time stamp 85 and overwritten. If the stored burst signal is a burst signal of empty data received from an adjacent base station and a new burst signal is received from a mobile station, it is determined by source ID 83 and overwritten. .
  • a relay time stamp 86 indicating the transmission time at the time of relaying is additionally corrected, and the burst signal is transmitted in the assigned time slot.
  • FIG. 10 is an example of a system configuration of another train operation management system.
  • the system configuration of FIG. 10 by connecting the management stations by wire, there is no need to perform wireless relay processing between wireless base stations belonging to adjacent management sections.
  • the principle of time slot allocation is the same as that shown in Fig. 9.
  • the wireless base station connected to the management station is located at one end of the management section, it will be as shown in Fig. 11.
  • the radio base station connected to the management station needs to perform relay processing only for one-way A along the track.
  • the reliability of the flow of a burst signal can be improved by performing site diversity.
  • the signal transmitted by the mobile station can be received not only by the wireless base station closest to the mobile station but also by a wireless base station farther away.
  • mobile station A has base stations 3 OF and 30 If it exists between G, the transmitted signal is received by both radio base stations. Since a plurality of base stations receive the signal of the mobile station in this manner, communication reliability is improved. (Site diversity of downlink signal)
  • the radio base station relays the berth and the signal doubly. For example, a burst signal transmitted by the base station 30D in the time slot T1 is received by the base stations 30E and 30F. On the other hand, the base station 30E relays the signal received at the time slot T1 at the time slot T3, and is received by the base stations 30F and 30G. As described above, in this embodiment, the burst signal is sequentially relayed by the double relay path. It should be noted that it is easy to expand a double transit route to a triple or quadruple transit route.
  • the mobile station By forming a burst signal flow using multiple relay paths in this way, the mobile station has an increased chance of receiving a burst signal having the same data content from a plurality of different radio base stations.
  • the mobile station transmits either the signal transmitted by base station 30E or the signal transmitted by base station 30F. If it can be received, communication can be performed normally. Therefore, communication reliability is improved.
  • the multiple relay path in this way, even if one of the base stations is in a state where transmission and reception cannot be performed due to some failure, the base station is bypassed and a burst signal is relayed. be able to. For example, when the base station 30E cannot transmit and receive, the base station 30F obtains a burst signal to be relayed from the base station 30D. Therefore, it has robustness that can tolerate a certain number of radio base station failures.
  • a synchronized time-division multiplexing network having a radio station as a node is formed.
  • Each time a transmission time slot for relaying in one direction along the orbit and a transmission time slot for relaying in the opposite direction are assigned to each radio base station located along the orbit, By allocating at most one time slot for mobile station transmission, it is possible to prevent burst signal collisions from multiple mobile stations and burst signal overflow during relaying.

Abstract

Un système de radiocommunication pour train permet la communication avec de nombreux trains en l'espace de durées courtes sans provoquer le chevauchement d'ondes en salves de plusieurs trains (stations mobiles (20) vers une station de base (30), système dans lequel un réseau multiplex à division temporelle synchrone est formé avec des stations radio constituant des noeuds. Alors que chacune des stations radio de base situées sur la voie se voit attribuer une tranche de temps pour la transmission de relais dans une direction le long de la voie et une tranche de temps pour la transmission de relais dans la direction opposée, au moins une tranche de temps est attribuée pour les communications avec les stations mobiles.
PCT/JP1998/002028 1997-05-08 1998-05-07 Systeme de radiocommunication pour train et emetteur/recepteur radio afferent WO1998051110A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54792398A JP3914268B2 (ja) 1997-05-08 1998-05-07 列車無線通信システム及びその無線送受信装置

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Application Number Priority Date Filing Date Title
JP9/117751 1997-05-08
JP11775197 1997-05-08

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WO1998051110A1 true WO1998051110A1 (fr) 1998-11-12

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JP2002012150A (ja) * 2000-06-29 2002-01-15 Nippon Signal Co Ltd:The 無線通信ネットワークシステム
FR2845541A1 (fr) * 2002-10-04 2004-04-09 Thales Sa Procede et dispositif de liaisons de donnees a tres haut debit
US7346316B1 (en) 1999-02-16 2008-03-18 Mitsubishi Denki Kabushiki Kaisha Radio communication system, a transmitter and a receiver
EP2048822A1 (fr) * 2006-07-10 2009-04-15 Mitsubishi Electric Corporation Système et procédé de répétition de données
JP2022501262A (ja) * 2018-11-26 2022-01-06 ミツビシ・エレクトリック・アールアンドディー・センター・ヨーロッパ・ビーヴィMitsubishi Electric R&D Centre Europe B.V. ダウンリンク送信リソースを割り当て、障害物検出強化データを送信するように構成された方法及びサーバ、コンピュータプログラム製品、並びに記憶媒体

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JP6918286B2 (ja) * 2019-05-09 2021-08-11 ソナス株式会社 中継ノード、制御方法、無線通信システム

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JPH07162349A (ja) * 1993-12-06 1995-06-23 Nec Corp 列車無線通信システム

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JPH04111627A (ja) * 1990-08-31 1992-04-13 Nec Corp 軌道移動体無線通信方式
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7346316B1 (en) 1999-02-16 2008-03-18 Mitsubishi Denki Kabushiki Kaisha Radio communication system, a transmitter and a receiver
US7929922B2 (en) 1999-02-16 2011-04-19 Mitsubishi Denki Kabushiki Kaisha Radio communication system, a transmitter and a receiver
US8027649B2 (en) 1999-02-16 2011-09-27 Mitsubishi Denki Kabushiki Kaisha Radio communication system, a transmitter and a receiver
JP2002012150A (ja) * 2000-06-29 2002-01-15 Nippon Signal Co Ltd:The 無線通信ネットワークシステム
FR2845541A1 (fr) * 2002-10-04 2004-04-09 Thales Sa Procede et dispositif de liaisons de donnees a tres haut debit
EP2048822A1 (fr) * 2006-07-10 2009-04-15 Mitsubishi Electric Corporation Système et procédé de répétition de données
EP2048822A4 (fr) * 2006-07-10 2011-07-06 Mitsubishi Electric Corp Système et procédé de répétition de données
JP5238500B2 (ja) 2006-07-10 2013-07-17 三菱電機株式会社 データ中継システムおよびデータ中継方法
JP2022501262A (ja) * 2018-11-26 2022-01-06 ミツビシ・エレクトリック・アールアンドディー・センター・ヨーロッパ・ビーヴィMitsubishi Electric R&D Centre Europe B.V. ダウンリンク送信リソースを割り当て、障害物検出強化データを送信するように構成された方法及びサーバ、コンピュータプログラム製品、並びに記憶媒体
JP7170854B2 (ja) 2018-11-26 2022-11-14 ミツビシ・エレクトリック・アールアンドディー・センター・ヨーロッパ・ビーヴィ ダウンリンク送信リソースを割り当て、障害物検出強化データを送信するように構成された方法及びサーバ、コンピュータプログラム製品、並びに記憶媒体

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