Method and apparatus for transmitting location estimation message in wireless communication system
Provided are a method and an apparatus for transmitting a message through a terminal in a wireless communication system. The terminal receives positioning reference signals (PRS) from a reference cell and at least one of the neighbor cells, receives an auxiliary data provision message including a reference cell PRS muting sequence for indicating a muting pattern of the PRS transmitted through the reference cell and a neighbor cell PRS muting sequence for indicating the muting pattern of the PRS transmitted through at least one of the neighbor cells from an enhanced serving mobile location center (E-SMLC), and transmits a reference signal time difference (RSTD) measured on the basis of the PRS received from the reference cell and the at least one of the neighbor cells to the E-SMLC.
1. A method of transmitting a message by a terminal in a wireless communication system, the method comprising:
receiving from a location server an assistance data provide message including an assistance data reference cell positioning reference signal (PRS) muting sequence indicating a muting configuration of an assistance data reference cell and a neighbor cell PRS muting sequence indicating a muting configuration of at least one neighbor cell;
receiving a PRS from the assistance data reference cell and the at least one neighbor cell based on the assistance data reference cell PRS muting sequence and the neighbor cell PRS muting sequence; and
transmitting to the location server a reference signal time difference (RSTD) determined based on the PRS received from the assistance data reference cell and the at least one neighbor cell,
wherein the assistance data reference cell PRS muting sequence and the neighbor cell PRS muting sequence are configured based on a system frame number (SFN) of the assistance data reference cell, and
wherein a first bit of the assistance data reference cell PRS muting sequence and the neighbor cell PRS muting sequence corresponds to a first PRS occasion after the SFN of the assistance data reference cell becomes 0.
2. The method of claim 1 , wherein the assistance data reference cell PRS muting sequence is configured based on a time of receiving the assistance data provide message.
3. The method of claim 2 , wherein a first bit of the assistance data reference cell PRS muting sequence corresponds to a first PRS occasion after the assistance data provide message is received.
4. The method of claim 1 , wherein the assistance data reference cell PRS muting sequence is configured based on the SFN of the assistance data reference cell obtained by decoding a physical broadcast channel (PBCH) transmitted from the assistance data reference cell.
5. The method of claim 1 , wherein bits constituting the assistance data reference cell PRS muting sequence or the neighbor cell PRS muting sequence are all 1 or 0.
6. The method of claim 1 , wherein the RSTD is a relative delay of a reference subframe including the PRS received from the assistance data reference cell and a neighbor subframe including the PRS received from the at least one neighbor cell and corresponding to the reference subframe.
7. The method of claim 1 , further comprising transmitting to the location server an assistance data request message for requesting the assistance data provide message.
8. The method of claim 1 , wherein the assistance data reference cell is a cell for which the SFN can be obtained by the terminal.
9. A terminal in a wireless communication system, the terminal comprising:
a radio frequency (RF) unit for transmitting or receiving a radio signal; and
a processor coupled to the RF unit,
wherein the processor is configured for:
receiving from a location server an assistance data provide message including an assistance data reference cell positioning reference signal (PRS) muting sequence indicating a muting configuration of an assistance data reference cell and a neighbor cell PRS muting sequence indicating a muting configuration of at least one neighbor cell;
receiving a PRS from the assistance data reference cell and the at least one neighbor cell based on the assistance data reference cell PRS muting sequence and the neighbor cell PRS muting sequence; and
transmitting to the location server a reference signal time difference (RSTD) determined based on the PRS received from the assistance data reference cell and the at least one neighbor cell,
wherein the assistance data reference cell PRS muting sequence and the neighbor cell PRS muting sequence are configured based on a system frame number (SFN) of the assistance data reference cell, and
wherein a first bit of the assistance data reference cell PRS muting sequence and the neighbor cell PRS muting sequence corresponds to a first PRS occasion after the SFN of the assistance data reference cell becomes 0.
10. The terminal of claim 9 , wherein the assistance data reference cell PRS muting sequence is configured based on a time of receiving the assistance data provide message.
11. The terminal of claim 9 , wherein the assistance data reference cell PRS muting sequence is configured based on the SFN of the assistance data reference cell obtained by decoding a physical broadcast channel (PBCH) transmitted from the assistance data reference cell.
12. The terminal of claim 9 , wherein bits constituting the assistance data reference cell PRS muting sequence or the neighbor cell PRS muting sequence are all 1 or 0.
13. The method of claim 9 , wherein the assistance data reference cell is a cell for which the SFN can be obtained by the terminal.