CELLULAR POSITIONING BASED VERIFICATION OF AN ESTIMATED VEHICLE POSITION
A method in a vehicle for verifying an estimated position of the vehicle, the method comprising establishing a wireless link to a radio base station, RBS, 150, obtaining data from a downlink transmission on the wireless link ( 145 ) from the RBS ( 150 ) to the vehicle ( 100 ) for estimating the vehicle position, estimating the vehicle position based on the data, transmitting a request for position verification to the RBS ( 150 ), receiving a response from the RBS ( 150 ) to the transmitted request comprising a verification position estimate based at least partly on data obtained from an uplink transmission on the wireless link ( 145 ) to the RBS ( 150 ) from the vehicle ( 100 ), and verifying the estimated position of the vehicle ( 100 ) by comparing the estimated vehicle position to the verification position estimate.
1 . A method in a vehicle for verifying an estimated position of the vehicle, the method comprising the steps of,
establishing a wireless link to a radio base station,
obtaining data for estimating the vehicle position,
estimating the vehicle position based on the data,
transmitting a request for a position verification to the radio base station,
receiving a response from the radio base station to the transmitted request comprising a verification position estimate based at least partly on data obtained from an uplink transmission on the wireless link to the radio base station from the vehicle, and
verifying the estimated position of the vehicle by comparing the estimated vehicle position to the verification position estimate.
2 . The method according to claim 1 , further comprising the steps of obtaining the data from a downlink transmission on the wireless link from the radio base station to the vehicle, and estimating the vehicle position based on downlink data comprising any of an angle of arrival, an angle of departure, a time of flight, a time of arrival and a time difference of arrival.
3 . The method according to claim 1 , further comprising the estimating the vehicle position is based at least partly on data obtained from a Global Navigation Satellite System, receiver comprised in the vehicle or based on radar data obtained from a radar transceiver comprised in the vehicle.
4 . The method according to claim 1 , wherein the estimated vehicle position is associated with a time stamp indicating a time instant corresponding to the vehicle position estimate.
5 . The method according to claim 1 , further comprising wherein the estimating the vehicle position by the radio base station based on data obtained from an uplink transmission on the wireless link to the radio base station from the vehicle.
6 . The method according to claim 5 , further comprising forwarding the data obtained from the uplink transmission to a remote server, and estimating the vehicle position by the remote server.
7 . The method according to claim 1 , wherein the verifying comprises comparing a difference between the estimated vehicle position and the verification position estimate to a pre-determined threshold.
8 . The method according to claim 1 , wherein the verifying step comprises comparing a difference between a probability density function of the estimated vehicle position and a probability density function of the verification position estimate to a pre-determined threshold.
9 . The method according to claim 1 , further comprising the step of scheduling recurrent verifications of the estimated vehicle position by the radio base station.
10 . A vehicle control unit comprising processing circuitry configured to perform the method according to claim 1 .
11 . A vehicle comprising the vehicle control unit according to claim 10 .
12 . A method in a radio base station, for verifying an estimated position of a vehicle, the method comprising
establishing a wireless link to a communications transceiver in the vehicle,
obtaining data from an uplink of the wireless link to the radio base station from the vehicle for estimating the vehicle position,
estimating the vehicle position based on the data,
transmitting a request for position verification to the vehicle,
receiving a response from the vehicle to the transmitted request comprising a verification position estimate generated by the vehicle, and
verifying the estimated position of the vehicle by comparing the estimated vehicle position with the verification position estimate.
13 . The method according to claim 12 , further comprising estimating the vehicle position based on the data by executing a positioning algorithm on a remote server.
14 . The method according to claim 12 , comprising the step of triggering an event by the radio base station in case the verifying indicates a discrepancy above a pre-determined level.
15 . A radio base station control unit comprising processing circuitry configured to perform the method according to claim 12 .