WO 2018/092789

PCT/JP2017/041004

[CLAIMS] [Claim 1]
A method of managing transmission resources in an infrastructure (INF) comprising a plurality of wayside radio units (WRU), or WRU, each defining a cell (CI, C2, C3) covering a portion of a railway (RW) on which vehicles (VI, V2, V3) comprising onboard communication systems (SYS1, SYS2, SYS3) move, the WRUs being arranged one after the other along the railway, each communication system comprising at least one device (DEV11, DEVI2, DEV21, DEV22, DEV31, DEV32) in communication with a WRU whose cell covers the portion in which the corresponding vehicle is located, the WRUs each having time-frequency resources adapted to be used by said WRUs for the communications with the devices of the communication systems onboard said vehicles, the method comprising, for at least one WRU, or reference WRU :
an exchange step (SI) during which said reference WRU receives cooperation data generated by each of one or more other WRUs, the cooperation data generated by a given WRU being representative of respective failure probabilities of at least part of the devices in communication with said given WRU, each failure probability being representative of a probability of a transmission failure between the considered device and the WRU in communication therewith,
an optimization step (S2) during which said reference WRU determines, based on the cooperation data, a resource allocation scheme (RAS2) defining at least time-frequency resources (TFR2) allocated to all or part of the devices which are in communication with said reference WRU, said resource allocation scheme being configured to maximize the probability that no transmission failure between a device and a WRU in communication therewith occurs for at least one device of each communication system across the set of devices including the devices in communication with said reference WRU and the devices for which cooperation data have been received during the exchange step,
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an operation step, wherein said resource allocation scheme is implemented by said reference WRU. [Claim 2]
The method according to claim 1, wherein for at least one WRU, the cooperation data generated by said WRU include position data representative of the respective positions within the cell of said WRU of at least part of the devices located onboard vehicles located in said cell which are in communication with said given WRU, the method further comprising the determination by the reference WRU of the failure probabilities associated to the corresponding devices based on said position data received during the exchange step (SI). [Claim 3]
The method according to claim 2, wherein the reference WRU includes a database (DB2) containing performance data which are representative of a performance of communication links that may be established by devices of the communication systems at least as a function of a considered position among a plurality of possible positions, said possible positions defining a coverage of the database within the infrastructure, the failures probabilities being determined by the reference WRU based on the position data and the performance data contained in said database. [Claim 4]
The method according to claim 3, wherein the coverage of the database covers all of the respective cells of each WRU of the infrastructure. [Claim 5]
The method according to claim 3, wherein the coverage of the database covers the cell of said reference WRU and the cell of at least one WRU neighboring the reference WRU along the railway. [Claim 6]
The method according to any one of the preceding claims, wherein said
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reference WRU is in communication with at least one device belonging to a communication system of a vehicle comprising at least one second device in communication with a second WRU different from said reference WRU, whereby said reference WRU and second WRU share at least one communication system, and wherein the cooperation data received during the exchange step (SI) are representative at least of the failure probabilities of each device belonging to a communication system which is shared by said reference WRU and which is not in communication with said reference WRU. [Claim 7]
The method according to claim 6, wherein during the optimization step, the reference WRU carries out an assessment of whether at least one chosen device in communication with said reference and a second WRU is to be handed-over to said second WRU, or chosen second WRU, said assessment being carried out based on a comparison of a first probability that no communication failure occurs for at least one device of each communication system across the set of devices which are in communication either with the reference WRU or said chosen second WRU, and a second probability that no communication failure occurs for at least one device of each communication system across said set of devices under the hypothesis that the chosen device is in communication with said chosen second WRU instead of the first WRU. [Claim 8]
The method according to claim 7, wherein the reference WRU:
determines a first resource allocation scheme configured to maximize the probability that no communication failure occurs for at least one device of each communication system across a first set of devices including all the devices in communication with the reference WRU as well as those which belong to communication systems shared by the reference WRU and other WRUs,
determines a second resource allocation scheme configured to maximize the probability that no communication failure occurs for at least one device of
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each communication system across a second set of devices including all the devices in communication with said chosen second WRU and the devices belonging to communication systems which are shared by the chosen second WRU and other WRUs,
determines a third resource allocation scheme configured to maximize the probability that no communication failure occurs for at least one device of each communication system across the first set of devices under the hypothesis that the chosen device is in communication with the chosen second WRU;
determines a fourth resource allocation scheme configured to maximize the probability that no communication failure occurs for at least one device of each communication system across a set of devices including the second set of devices and the chosen device if the chosen device does not belong to the second set of devices, and
determines the first probability based on the first and third resource allocation schemes, and the second probability based on the second and fourth resource allocation schemes. [Claim 9]
The method according to claim 7 or 8, wherein the optimization step further comprises determining the resource allocation scheme to be implemented in the operation step (S4) based on said assessment. [Claim 10]
The method according to claims 8 and 9, wherein the resource allocation scheme is selected among the first and third resource allocation schemes. [Claim 11]
The method according to any one of the preceding claims, wherein the resource allocation scheme is associated to a given time window, the operation step being carried out during said time window, a new resource allocation scheme being determined for every consecutive time window over a given period of time.
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[Claim 12]
The method according to any one of the preceding claims, wherein the WRUs of the infrastructure comprise a jammer configuration database (DB'2) containing jammer performance data generated in response to the presence of a jammer device being detected by the infrastructure and being generated as a function of detected characteristics of the jammer device (JAM) so as to account for the impact of the jammer device on the communications of the WRUs with the devices of the communication systems of the vehicles, the jammer performance data being representative of a performance of communication links that may be established by devices of the communication systems with the WRUs at least as a function of a considered position among a plurality of possible positions, said possible positions defining a coverage of the jammer configuration database within the infrastructure, at least the optimization step being carried out on the basis of the jammer configuration database of the reference WRU in response to the jammer device (JAM) being detected by the infrastructure. [Claim 13]
The method according to any one of the preceding claims, wherein the cooperation data exchanged during the exchange step include, for all or part of the considered devices, an identifier of the device and an identifier of the communication link between the considered device and the corresponding WRU, said identifier of the communication link being representative at least of whether the communication link is an uplink or a downlink. [Claim 14]
The method according to any one of the preceding claims, further comprising a step of determining failure probabilities for the devices in communication with the reference WRU due to said resource allocation scheme, and a further step of exchange wherein said reference WRU generates cooperation data representative of said failure probabilities and sends them to
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another piece of equipment of the infrastructure, said data being destined to be received by at least one other WRU. [Claim 15]
An infrastructure comprising a plurality of wayside radio units, or WRU, each defining a cell covering a portion of a railway on which vehicles comprising onboard communication systems move, the WRUs being arranged one after the other along the railway, each communication system comprising at least one device in communication with a WRU whose cell covers the portion in which the corresponding vehicle is located, the WRUs each having time-frequency resources adapted to be used by said WRUs for the communications with the devices of the communication systems onboard said vehicles, the infrastructure comprising at least one WRU, or reference WRU, which includes:
a communication module configured to receive cooperation data generated by each of one or more other WRUs, the cooperation data generated by a given WRU being representative of respective failure probabilities of the devices in communication with said given WRU, each failure probability being representative of a probability of a transmission failure between the considered device and the WRU in communication therewith, and
a management module configured to :
determine, based on the cooperation data, a resource allocation scheme defining at least time-frequency resources allocated to all or part of the devices which are in communication with said reference WRU, said resource allocation scheme being configured to maximize the probability that no transmission failure between a device and a WRU in communication therewith occurs for at least one device of each communication system across the set of devices including the devices in communication with said WRU and the devices for which cooperation data have been received during the exchange step, trigger the implementation of the resource allocation scheme.
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