Route planning method and device for navigation system and storage medium
View Patent ↗Disclosed is a route planning method for a navigation system. The method comprises: performing grid processing on an actual geographic space, the grids being cells in a cellular network, acquiring a mobile station cell handover record, and creating a cell adjacency model according to the mobile station cell handover record; making a source and a destination in the actual geographic space correspond to a source grid and a destination grid after the grid processing, and determining a grid-level path from the source grid to the destination grid according to the inter-grid adjacency model; and converting the grid-level path into an actual route from the source to the destination in the actual geographic space. Also disclosed is a route planning device for a navigation system.
1. A route planning method for a navigation system, comprising:
acquiring a handover record of inter-cell handovers of mobile stations; and modelling an inter-cell adjacency according to the handover record, wherein an actual geographic space is divided into a grid of cells of a cellular network;
mapping a departure point and a destination point in the actual geographic space respectively to a departure cell and a destination cell; and determining, according to the modelled inter-cell adjacency, a grid-level path from the departure cell to the destination cell; and
converting the grid-level path into an actual route from the departure point to the destination point in the actual geographic space,
wherein the acquiring a handover record of inter-cell handovers of mobile stations comprises:
reading a file recording inter-cell handovers of mobile stations stored in a dedicated File Transfer Protocol (FTP) server by a signalling collecting platform of a mobile operator, and acquiring handover records from the file,
wherein the method further comprises, before the modelling an inter-cell adjacency according to the handover record:
filtering the handover record by at least one of:
deleting a record related to a number of a mobile station with no mobility;
retaining only records related to specific mobile station numbers; or
deleting a handover record when a cell identifier in the handover record is not one of cell identifiers loaded in memory,
wherein the modelling an inter-cell adjacency according to the handover record comprises:
extracting trajectories of the mobile stations according to the handover record;
setting a set of all the trajectories within a period of time as a snapshot; and
modelling the inter-cell adjacency within the period of time according to the snapshot by:
establishing, according to the snapshot, a weighted directed graph, with base stations of all the cells as vertices, inter-cell adjacencies as edges, and with an inter-cell adjacency index as a weight of an edge,
wherein the inter-cell adjacency index is a probability of transfer between two cells, and
wherein the probability is a number of records of transfer from a source cell to a target cell divided by a number of all records of transfer from the source cell.
2. The method according to claim 1 , wherein the converting the grid-level path into an actual route from the departure point to the destination point in the actual geographic space comprises:
converting the grid-level path into an actual route from the departure point to the destination point in a Geographic Information System (GIS) map; and/or
converting the grid-level path into an actual route from the departure point to the destination point in a satellite map.
3. A route planning device for a navigation system, comprising:
a processor; and
memory storing instructions executable by the processor, wherein the processor
is configured for performing a route planning method for a navigation system, the method comprising:
acquiring a handover record of inter-cell handovers of mobile stations; and modelling an inter-cell adjacency according to the handover record, wherein an actual geographic space is divided into a grid of cells of a cellular network;
mapping a departure point and a destination point in the actual geographic space respectively to a departure cell and a destination cell; and determining, according to the modelled inter-cell adjacency, a grid-level path from the departure cell to the destination cell; and
converting the grid-level path into an actual route from the departure point to the destination point in the actual geographic space,
wherein the acquiring a handover record of inter-cell handovers of mobile stations comprises:
reading a file recording inter-cell handovers of mobile stations stored in a dedicated File Transfer Protocol (FTP) server by a signalling collecting platform of a mobile operator, and acquiring handover records from the file,
wherein the method further comprises, before the modelling an inter-cell adjacency according to the handover record:
filtering the handover record by at least one of:
deleting a record related to a number of a mobile station with no mobility;
retaining only records related to specific mobile station numbers; or
deleting a handover record when a cell identifier in the handover record is not one of cell identifiers loaded in memory,
wherein the modelling an inter-cell adjacency according to the handover record comprises:
extracting trajectories of the mobile stations according to the handover record;
setting a set of all the trajectories within a period of time as a snapshot; and
modelling the inter-cell adjacency within the period of time according to the snapshot by:
establishing, according to the snapshot, a weighted directed graph, with base stations of all the cells as vertices, inter-cell adjacencies as edges, and with an inter-cell adjacency index as a weight of an edge,
wherein the inter-cell adjacency index is a probability of transfer between two cells, and
wherein the probability is a number of records of transfer from a source cell to a target cell divided by a number of all records of transfer from the source cell.
4. The device according to claim 3 , wherein the converting the grid-level path into an actual route from the departure point to the destination point in the actual geographic space comprises:
converting the grid-level path into an actual route from the departure point to the destination point in a Geographic Information System (GIS) map; and/or
converting the grid-level path into an actual route from the departure point to the destination point in a satellite map.
5. A non-transitory computer-readable storage medium, storing therein computer executable instructions for executing a route planning method for a navigation system, the method comprising:
acquiring a handover record of inter-cell handovers of mobile stations; and modelling an inter-cell adjacency according to the handover record, wherein an actual geographic space is divided into a grid of cells of a cellular network;
mapping a departure point and a destination point in the actual geographic space respectively to a departure cell and a destination cell; and determining, according to the modelled inter-cell adjacency, a grid-level path from the departure cell to the destination cell; and
converting the grid-level path into an actual route from the departure point to the destination point in the actual geographic space,
wherein the acquiring a handover record of inter-cell handovers of mobile stations comprises:
reading a file recording inter-cell handovers of mobile stations stored in a dedicated File Transfer Protocol (FTP) server by a signalling collecting platform of a mobile operator, and acquiring handover records from the file,
wherein the method further comprises, before the modelling an inter-cell adjacency according to the handover record:
filtering the handover record by at least one of:
deleting a record related to a number of a mobile station with no mobility;
retaining only records related to specific mobile station numbers; or
deleting a handover record when a cell identifier in the handover record is not one of cell identifiers loaded in memory,
wherein the modelling an inter-cell adjacency according to the handover record comprises:
extracting trajectories of the mobile stations according to the handover record;
setting a set of all the trajectories within a period of time as a snapshot; and
modelling the inter-cell adjacency within the period of time according to the snapshot by:
establishing, according to the snapshot, a weighted directed graph, with base stations of all the cells as vertices, inter-cell adjacencies as edges, and with an inter-cell adjacency index as a weight of an edge,
wherein the inter-cell adjacency index is a probability of transfer between two cells, and
wherein the probability is a number of records of transfer from a source cell to a target cell divided by a number of all records of transfer from the source cell.
6. The non-transitory computer-readable storage medium according to claim 5 , wherein the converting the grid-level path into an actual route from the departure point to the destination point in the actual geographic space comprises:
converting the grid-level path into an actual route from the departure point to the destination point in a Geographic Information System (GIS) map; and/or
converting the grid-level path into an actual route from the departure point to the destination point in a satellite map.