Position estimation using mobile anchor

A position estimation entity configured for determining a position of a target user equipment (UE), comprising:

• a memory;
• at least one external interface;
• and
• at least one processor communicatively coupled to the memory and the at least one external interface, the at least one processor configured to:
• obtain a set of Reference Signal Time Difference (RSTD) measurements for the target UE comprising at least three RSTD measurements generated at different times by the target UE, wherein each RSTD measurement in the set of RSTD measurements is produced using a positioning reference signal (PRS) from a first PRS instance set transmitted by a stationary anchor entity and a corresponding PRS from a second PRS instance set transmitted by a moving anchor entity;
• obtain at least two anchor-to-anchor receive-transmit (RxTx) time difference measurements, wherein each anchor-to-anchor RxTx time difference measurement is associated with the PRS from the first PRS instance set and the corresponding PRS from the second PRS instance set, wherein a number of anchor-to-anchor RxTx time difference measurements is less than a number of RSTD measurements in the set of RSTD measurements;
• and
• determine a position estimate of the target UE based on the set of RSTD measurements and the at least two anchor-to-anchor RxTx time difference measurements.

A position estimation entity configured for determining a position of a target user equipment (UE), comprising:

• means for obtaining a set of Reference Signal Time Difference (RSTD) measurements for the target UE comprising at least three RSTD measurements generated at different times by the target UE, wherein each RSTD measurement in the set of RSTD measurements is produced using a positioning reference signal (PRS) from a first PRS instance set transmitted by a stationary anchor entity and a corresponding PRS from a second PRS instance set transmitted by a moving anchor entity;
• means for obtaining at least two anchor-to-anchor receive-transmit (RxTx) time difference measurements, wherein each anchor-to-anchor RxTx time difference measurement is associated with the PRS from the first PRS instance set and the corresponding PRS from the second PRS instance set, wherein a number of anchor-to-anchor RxTx time difference measurements is less than a number of RSTD measurements in the set of RSTD measurements;
• and
• means for determining a position estimate of the target UE based on the set of RSTD measurements and the at least two anchor-to-anchor RxTx time difference measurements.

A non-transitory computer-readable storage medium including program code stored thereon, the program code is operable to configure at least one processor in a position estimation entity for determining a position of a target user equipment (UE), the program code comprising instructions to:

• obtain a set of Reference Signal Time Difference (RSTD) measurements for the target UE comprising at least three RSTD measurements generated at different times by the target UE, wherein each RSTD measurement in the set of RSTD measurements is produced using a positioning reference signal (PRS) from a first PRS instance set transmitted by a stationary anchor entity and a corresponding PRS from a second PRS instance set transmitted by a moving anchor entity;
• obtain at least two anchor-to-anchor receive-transmit (RxTx) time difference measurements, wherein each anchor-to-anchor RxTx time difference measurement is associated with the PRS from the first PRS instance set and the corresponding PRS from the second PRS instance set, wherein a number of anchor-to-anchor RxTx time difference measurements is less than a number of RSTD measurements in the set of RSTD measurements;
• and
• determine a position estimate of the target UE based on the set of RSTD measurements and the at least two anchor-to-anchor RxTx time difference measurements.