Method for enhanced mobile assisted positioning
At a first user equipment (UE), an uplink signal is received of at least one second UE is received and time marked. At the first UE, a downlink signal from at least one base station is received and time marked. Observed time differences of arrival are determined using the time markings. A position of the first UE is determined based on the determined time differences of arrival.
1. A method of determining a position of a mobile user equipment (UE), the method comprising:
at a first mobile UE:
receiving and time marking an uplink signal of a second mobile UE;
receiving and time marking a downlink signal;
determining observed time difference of arrivals using the time markings of the uplink signal of a second mobile UE and a downlink signal;
measuring a received signal code power (RSCP) and a transmit power of the second mobile UE for determining a path loss;
determining an angle-of-arrival of the uplink signal; and
transmitting the determined observed time difference of arrivals, the RSCP, the transmit power, and the determined angle-of-arrival to a network entity for determining a position of the first mobile UE based on the path loss.
2. The method as in claim 1 , further comprising determining an angle-of-arrival of the downlink signal and transmitting the determined angle-of-arrival to the network entity.
3. A mobile user equipment (UE) comprising:
a receiver configured to receive and time mark an uplink signal of a second mobile UE, and to receive and time mark a downlink signal;
a time difference calculation device configured to determine observed time difference of arrivals using the time markings of the uplink signal of a second mobile UE and a downlink signal;
a smart antenna configured to determine an angle-of-arrival of the uplink signal;
a received signal code power (RSCP) determination device configured to measure the RSCP of the second mobile UE; and
a transmitter configured to transmit the determined observed time difference of arrivals, the angle-of-arrival of the uplink signal, a transmit power of the second mobile UE, and the RSCP to a network entity for determining a position of the mobile UE based on a path loss determined by the transmit power and the RSCP of the second mobile UE.
4. The mobile UE as in claim 3 , wherein the smart antenna is further configured to determine an angle-of-arrival of the downlink signal and the transmitter is further configured to transmit the angle-of-arrival of the downlink signal.
5. A radio network controller comprising:
a positioning device configured to receive an angle-of-arrival of an uplink signal of a first mobile user equipment (UE), to receive an observed time difference of arrivals between an uplink signal and a downlink signal to the first mobile UE, to determine a path loss between the first mobile UE and a second mobile UE based on a received signal code power (RSCP) for the first mobile UE, to determine the distance between the first mobile UE and the second mobile UE based on the path loss, and to calculate the position of the first mobile UE based on the angle-of-arrival, the observed time difference of arrivals, and the distance between the first mobile UE and the second mobile UE.
6. The radio network controller as in claim 5 wherein the RSCP of the second mobile UE, the angle-of-arrival, and the observed time difference of arrivals are received from the second mobile UE.
7. The radio network controller as in claim 5 wherein the positioning device is further configured to receive an angle-of-arrival for a downlink signal sent to the first mobile UE.
8. The radio network controller as in claim 7 , wherein the angle-of-arrival for the downlink is received from the second mobile UE.