Network-based positioning method using relay in nr-V2X system, and device therefor
The present disclosure relates to a method for performing positioning in a new radio-vehicle to everything (NR-V2X) system, and a device therefor. A method for performing network-based positioning in a new radio-vehicle to everything (NR-V2X) communication system according to an aspect may comprise the steps of determining whether positioning using a relay is required, on the basis of whether there is performance deterioration in positioning of a terminal; determining at least one relay terminal to be used as an anchor node for positioning of the terminal when the positioning using the relay is required; requesting terminal assistant measurement information for the positioning of the terminal from the relay terminal; receiving the terminal assistant measurement information from the relay terminal; and measuring an absolute position of the terminal on the basis of the terminal assistant measurement information.
1 . A method comprising:
detecting, by a first device, a radio link failure (RLF) for a first user equipment (UE);
transmitting, by the first device, configuration information related to at least one positioning reference signal (PRS) resource to a second UE;
receiving, by the first device, first measurement information measured based on the at least one PRS resource from the second UE,
wherein the first measurement information includes information for at least one of a reference signal time difference (RSTD) or a reference signal received power (RSRP);
based on (i) the detection of the RLF for the first UE and (ii) a reliability of an absolute position of the second UE estimated using the first measurement information being greater than a specific threshold, determining, by the first device, the second UE as an anchor node (AN) for positioning of the first UE,
wherein the second UE is a relay UE that supports a connection between the first device and the first UE;
transmitting, by the first device, assistance information for a relative positioning scheme between the first UE and the second UE to the second UE; and
receiving, by the first device, UE assistance information including measurements measured by the relative positioning scheme from the second UE.
2 . The method according to claim 1 , further comprising:
requesting capability information from the second UE; and
receiving the capability information from the second UE,
wherein the capability information includes capability information of the second UE and capability information of the first UE.
3 . The method according to claim 2 , further comprising:
determining the relative positioning scheme based on the capability information.
4 . The method according to claim 3 , wherein measurement information for the first UE is collected by the second UE based on positioning signaling information and sidelink (SL)-PRS received from the first UE through sidelink.
5 . The method according to claim 4 , wherein the positioning signaling information is included in sidelink control information (SCI), and
wherein the SCI is transmitted in an NR-V2X service slot structure for a physical sidelink shared channel (PSSCH) and a physical sidelink control channel (PSCCH) or in a slot structure dedicated for new radio-vehicle to everything (NR-V2X) sidelink positioning.
6 . The method according to claim 4 , wherein the positioning signaling information includes at least one of:
a first UE ID (identifier), a first UE speed, a first UE heading, a Time of Arrival (ToA), Time of Flight (ToF), or relative position measured based on the SL-PRS received from the second.
7 . A first device comprising:
a transceiver;
a processor connected to the transceiver,
wherein the processor is configured to:
detect a radio link failure (RLF) for a first user equipment (UE);
transmit configuration information related to at least one positioning reference signal (PRS) resource to a second UE;
receive first measurement information measured based on the at least one PRS resource from the second UE, wherein the first measurement information includes information for at least one of a reference signal time difference (RSTD) or a reference signal received power (RSRP);
based on (i) the detection of the RLF for the first UE and (ii) a reliability of an absolute position of the second UE estimated using the first measurement information being greater than a specific threshold, determine the second UE as an anchor node (AN) for positioning of the first UE,
wherein the second UE is a relay UE that supports a connection between the first device and the first UE;
transmitting, by the first device, assistance information for a relative positioning scheme between the first UE and the second UE to the second UE; and
receiving, by the first device, UE-assistance information including measurements measured by the relative positioning scheme from the second UE.
8 . The server according to claim 7 ,
wherein the processor is configured to receive capability information from the second UE after requesting the capability information from the second UE,
wherein the capability information includes capability information of the second UE and capability information of the first UE.
9 . The server according to claim 8 , wherein the processor is configured to:
determine the relative positioning scheme based on the capability information.
10 . The server according to claim 9 , wherein measurement information for the first UE is collected by the second UE based on positioning signaling information and sidelink (SL)-PRS received from the first UE through sidelink.
11 . The server according to claim 10 , wherein the positioning signaling information is included in sidelink control information (SCI), and
wherein the SCI is transmitted in an NR-V2X service slot structure for a physical sidelink shared channel (PSSCH) and a physical sidelink control channel (PSCCH) or in a slot structure dedicated for new radio-vehicle to everything (NR-V2X) sidelink positioning.
12 . The server according to claim 10 , wherein the positioning signaling information includes at least one of:
a first UE ID (identifier), a first UE speed, a first UE heading, a Time of Arrival (ToA) or Time of Flight (ToF) or relative position measured based on the SL-PRS received from the second UE.