Patent ID: 11924844
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 0:
1. A method for allocating downlink transmission resources for transmitting obstacle detection enhancement data to at least one on-board wireless radio unit of respective at least one moving conveyance travelling on at least one predefined path, each moving conveyance embedding an obstacle detection system and an on-board wireless radio unit communicating with a server via a wireless link, time being divided in transmission cycles Cn wherein n represents a sequence number, the method being performed by the server and comprising, for each moving conveyance:
obtaining information about actual speed and location of the moving conveyance on one said predefined path and about actual quality Qk of the wireless link between the server and the on-board wireless radio unit; and
allocating downlink transmission resources to the at least one on-board wireless radio unit during each transmission cycle Cn,
characterized in that the method further comprises, for each moving conveyance:
computing a distance dk travelled by said moving conveyance during one transmission cycle at the actual speed of said moving conveyance;
estimating location on said predefined path from which the obstacle detection system would need the obstacle detection enhancement data to be transmitted in the transmission cycle Cn, from the actual speed and location of said moving conveyance;
requesting to a database storing the obstacle detection enhancement data a volume-to-distance ratio information bk representing quantity of obstacle detection enhancement data per meter, from said estimated location;

determining the downlink transmission resources to be allocated to the on-board wireless radio unit of said moving conveyance during the transmission cycle Cn, by optimizing the difference between the distance dk and a distance Dk that is covered by the obstacle detection enhancement data made available to the obstacle detection system of said moving conveyance at the start of the transmission cycle Cn+1, wherein the volume of obstacle detection enhancement data expected to be transmitted during the transmission cycle Cn is determined from the volume-to-distance ratio information bk and from the actual quality Qk of said wireless link.