Method, apparatus and system for measuring a position of a user equipment in a wireless network

An anchor user equipment (UE) in a wireless network, comprising:

• communication circuitry to:
• transmit a first message to a location base server, wherein the first message includes position information related to the anchor UE;
• receive a second message from a target UE in the wireless network, wherein the second message includes an inquiry about whether a position of the anchor UE is knowable to the target UE;
• and
• transmit a third message from the anchor UE, wherein the third message includes a response to the inquiry indicating that the position of the anchor UE is knowable to the target UE;
• and
• control circuitry, coupled with the communication circuitry, the control circuitry to determine that the position of the anchor UE is knowable to the target UE based on a security factor.

A target user equipment (UE) in a wireless network, comprising:

• means for receiving a first message from a location base server, wherein the first message includes position assistance data that includes an identity of an anchor UE whose position is known to the location base server;
• means for transmitting a second message to the anchor UE in the wireless network, wherein the second message includes an inquiry about whether a position of the anchor UE is knowable to the target UE;
• and
• means for receiving a third message from the anchor UE, wherein the third message includes a response to the inquiry indicating that the position of the anchor UE is knowable to the target UE;
• and
• means for performing a positioning measurement based on the third message.