WO2024023978A1

WO2024023978A1 - Terminal and positioning method

Info

Publication number: WO2024023978A1
Application number: PCT/JP2022/028977
Authority: WO
Inventors: 真哉岡村; 大樹武田; 康介島; 浩樹原田; 春陽越後
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2024-02-01

Abstract

A terminal according to the present invention comprises: a reception unit that receives, from a base station, a radio resource control (RRC) message which is notified when a transition into an RRC idle state or an RRC inactive state occurs; and a transmission unit that transmits, to the base station, a positioning-purpose physical random access channel (PRACH) preamble included in the RRC message on the basis of a setting for the positioning-purpose PRACH preamble.

Description

Terminal and positioning method

The present invention relates to a terminal and a positioning method in a wireless communication system.

3GPP (registered trademark) (3rd Generation Partnership Project) is working on 5G or NR ( Studies are progressing on a wireless communication system called ``New Radio'' (hereinafter referred to as ``NR''). Various wireless technologies and network architectures are being studied to meet the requirements of NR, such as large-capacity systems, high data transmission speeds, low latency, simultaneous connection of many terminals, low cost, and power savings. (For example, Non-Patent Document 1).

Furthermore, in the 3GPP standardization, strengthening of positioning of UE (User Equipment) is being considered. For example, positioning in side links, positioning in NR, and positioning in RedCap (Reduced Capability) UEs are being considered.

In positioning in NR, LPHAP (Low Power High Accuracy Positioning) is being considered. In order to support highly accurate positioning in RRC (Radio Resource Control) idle state or RRC inactive state, it is assumed that PRACH (Physical Random Access Channel) preamble is used as UL-PRS (Uplink Positioning Reference Signal). Ru. However, with the current NR specifications, it is difficult to flexibly provide positioning using the PRACH preamble.

The present invention has been made in view of the above points, and it is an object of the present invention to provide functions necessary for positioning using a preamble of a random access channel in a wireless communication system.

According to the disclosed technology, a receiving unit receives from a base station an RRC message that is notified when transitioning to an RRC (Radio Resource Control) idle state or an RRC inactive state, and a PRACH (for positioning) included in the RRC message. A terminal is provided, including a transmitting unit that transmits the positioning PRACH preamble to the base station based on settings related to the physical random access channel (physical random access channel) preamble.

According to the disclosed technology, it is possible to provide a function necessary for positioning using a preamble of a random access channel in a wireless communication system.

FIG. 1 is a diagram for explaining a wireless communication system. It is a figure showing example (1) of positioning. FIG. 3 is a diagram showing an example of measuring DL-RSTD. FIG. 3 is a diagram showing an example of measuring UL-RTOA. It is a figure showing example (2) of positioning. FIG. 3 is a diagram showing an example of measuring RTT. FIG. 3 is a diagram showing an example of timing advance. FIG. 3 is a diagram illustrating an example of reporting a timing advance. It is a figure showing an example of a message in an embodiment of the present invention. It is a figure which shows the example (1) of a specification change in embodiment of this invention. It is a figure showing an example of PRACH in an embodiment of the present invention. It is a figure which shows the example (2) of a specification change in embodiment of this invention. It is a figure which shows the example (3) of a specification change in embodiment of this invention. 1 is a diagram showing an example of a functional configuration of a base station 10 in an embodiment of the present invention. It is a diagram showing an example of the functional configuration of a terminal 20 in an embodiment of the present invention. FIG. 2 is a diagram showing an example of the hardware configuration of a base station 10 or a terminal 20 in an embodiment of the present invention. It is a figure showing an example of composition of vehicle 2001 in an embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

Existing technologies are used as appropriate for the operation of the wireless communication system according to the embodiment of the present invention. However, the existing technology is, for example, existing LTE, but is not limited to existing LTE. Furthermore, unless otherwise specified, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and a system after LTE-Advanced (e.g. NR), or wireless LAN (Local Area Network). shall have.

Further, in the embodiment of the present invention, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or another method (for example, Flexible Duplex, etc.). This method may also be used.

Furthermore, in the embodiment of the present invention, "configure" the wireless parameters etc. may mean pre-configuring a predetermined value, or may mean that the base station 10 or Wireless parameters notified from the terminal 20 may also be set.

FIG. 1 is a diagram for explaining a wireless communication system. The wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20, as shown in FIG. Although one base station 10 and one terminal 20 are shown in FIG. 1, this is just an example, and there may be a plurality of each.

The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of a radio signal are defined in the time domain and frequency domain, and the time domain may be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain may be defined by the number of subcarriers or resource blocks. Good too. Furthermore, a TTI (Transmission Time Interval) in the time domain may be a slot, or a TTI may be a subframe.

The base station 10 transmits a synchronization signal and system information to the terminal 20. The synchronization signals are, for example, NR-PSS and NR-SSS. System information is transmitted, for example, on NR-PBCH, and is also referred to as broadcast information. The synchronization signal and system information may be called SSB (SS/PBCH block). As shown in FIG. 1, the base station 10 transmits a control signal or data to the terminal 20 on the DL (Downlink), and receives the control signal or data from the terminal 20 on the UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to transmit and receive signals. Further, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output) communication to DL or UL. Further, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell) and a primary cell (PCell) using CA (Carrier Aggregation). Furthermore, the terminal 20 may communicate via a primary cell of the base station 10 and a primary SCG cell (PSCell) of another base station 10 using DC (Dual Connectivity).

The terminal 20 is a communication device equipped with a wireless communication function, such as a smartphone, a mobile phone, a tablet, a wearable terminal, or a communication module for M2M (Machine-to-Machine). As shown in FIG. 1, the terminal 20 receives control signals or data from the base station 10 via DL, and transmits control signals or data to the base station 10 via UL, thereby receiving various types of information provided by the wireless communication system. Use communication services. Furthermore, the terminal 20 receives various reference signals transmitted from the base station 10, and measures the channel quality based on the reception results of the reference signals. Note that the terminal 20 may be called a UE, and the base station 10 may be called a gNB.

Additionally, LTE or NR supports a carrier aggregation function that uses wideband to secure data resources. The carrier aggregation function makes it possible to secure broadband data resources by bundling multiple component carriers. For example, a 100 MHz width can be used by bundling multiple 20 MHz bandwidths.

In addition, in the 3GPP standardization, a new device type (hereinafter referred to as "RedCapUE") has lower cost and complexity than eMBB (enhanced Mobile Broadband) devices or URLLC (Ultra-Reliable and Low Latency Communications) devices as a Reduced Capability NR device. ) is being considered.

For example, RedCap UE may support a smaller maximum bandwidth. For example, in Frequency Range 1 (FR1), the RedCap UE may have a maximum bandwidth of 20 MHz during initial access and thereafter. For example, in Frequency Range 2 (FR2), the RedCap UE may have a maximum bandwidth of 100 MHz during initial access and thereafter.

For example, a RedCap UE may support a small number of receive branches. For example, a RedCap UE may support one or two reception branches. Further, the maximum number of MIMO layers that the RedCap UE supports may be small. For example, RedCap UE may support one or two MIMO layers. Further, RedCap UE may support a small modulation order. For example, RedCap UE may optionally support 256QAM (Quadrature amplitude modulation) in FR1.

In addition, RedCap UE is being considered to support HD-FDD (Half-Duplex Frequency Division Duplex) in order to reduce complexity. In full-duplex FDD (full-duplex frequency division duplexing), DL carriers and UL carriers are placed on different frequencies and can transmit and receive at the same time. On the other hand, in HD-FDD (half-duplex frequency division duplexing), DL carriers and UL carriers are placed on different frequencies, cannot transmit and receive at the same time, and switching time between DL and UL is required. HD-FDDs can do away with duplexers and instead use switches and additional filters.

In addition, positioning of the terminal 20 using the LMF (Location Management Function) in the Uu interface of 3GPP Release 16 or 17 is performed by methods 1) to 3) shown below (Non-patent Document 2, Non-Patent Document 3). and Non-Patent Document 4).

1) Method based on DL-TDOA (Time Difference of Arrival) 2) Method based on UL-TDOA 3) Method based on Multi-RTT (Round Trip Time)

FIG. 2 is a diagram showing an example (1) of positioning. As shown in FIG. 2, the location information of the UE may be calculated based on the DL-TDOA. The position of the UE may be estimated based on DL-RSTD (Received Signal Time Difference) in which the UE measures DL radio signals transmitted from TRPs of multiple NRs. The geographic location of the TRP and the DL transmission timing in the TRP may be used for the estimation. In addition to DL-RSTD, the position of the UE may be estimated based on RSRP (Reference Signal Received Power) of DL-PRS (Positioning Reference Signal).

In the method based on DL-TDOA, the location of the UE may be calculated using the following procedure.
1) gNB transmits DL-PRS from each TRP to UE 2) UE transmits DL-RSTD, which is the measurement result, to GW and/or gNB and/or LMF via LPP (LTE Positioning Protocol) Report 3) gNB reports timing information related to TRP to LMF via NRPPa (NR Positioning Protocol A) 4) Based on the above information reported from UE and gNB, LMF calculates the UE position

For example, as shown in Fig. 2, the delay between UE and TRP0, the delay between UE and TRP1, the delay between UE and TRP2 are measured, and the geographical location and DL transmission timing of each TRP are measured. The location of the UE may be calculated based on.

FIG. 3 is a diagram showing an example of measuring DL-RSTD. Hereinafter, "and/or" will also be written as "/". As shown in Figure 3, DL-RSTD is the time difference measured by the UE between the reception start time of the DL subframe of the reference TRP (TRP0 in Figure 3) and the reception start time of the DL subframe of other TRPs. You may refer to it. The start of a subframe may be determined by detecting DL-PRS.

The transmission timing of each TRP does not have to be uniform.

Regarding the calculation of the UE position by DL-TDOA, the information shown in 1)-5) below may be reported from the UE to the GW/gNB/LMF.

1) PCI (Physical Cell ID), GCI (Global Cell ID) and TRP-ID in each measurement
2) DL-RSTD measurement results 3) DL-PRS-RSRP measurement results 4) Measurement time (time stamp)
5) Quality of each measurement Regarding the calculation of the UE position by DL-TDOA, the information shown in 1) to 6) below may be reported from the gNB to the LMF.

1) PCI, GCI and TRP-ID of TRP controlled by gNB
2) Timing information of TRPs controlled by gNB 3) DL-PRS settings of TRPs controlled by gNB 4) Information related to SSB of TRPs controlled by gNB, such as SSB time and frequency resources 5) Information of TRPs controlled by gNB Information related to the spatial direction of DL-PRS 6) Information related to the geographic coordinates of TRP controlled by gNB

DL-RSTD may be defined as the time difference measured by the UE between the reception start time of the DL subframe of the reference TRP and the reception start time of the DL subframe of another TRP. Multiple DL-PRS resources may be used to determine when to start receiving a subframe.

As a report of timing information related to the TRP controlled by the gNB, the SFN initialization time of the TRP may be reported. The SFN initialization time is the time when SFN0 is started.

As a report of information related to the geographical coordinates of the TRP controlled by the gNB, a point on an ellipsoid having an altitude and an ellipse indicating the range of error may be reported (see Non-Patent Document 5). For example, latitude, longitude, altitude, altitude direction, altitude error range, etc. may be reported.

As shown in FIG. 2, the location information of the UE may be calculated based on the UL-TDOA. The position of the UE may be estimated based on UL-RTOA (Relative Time of Arrival) in which TRPs of multiple NRs measure UL radio signals transmitted from the UE. Other setting information may be used for the estimation. Furthermore, in addition to UL-RTOA, the position of the UE may be estimated based on RSRP of UL-SRS (Sounding Reference Signal).

In the method based on UL-TDOA, the location of the UE may be calculated using the following procedure.
1) UE transmits SRS for multiple TRPs 2) gNB reports measurement results of UL-RTOA and TRP geographic coordinates to LMF via NRPPa 3) The above reported from gNB Based on the information, the LMF calculates the location of the UE.

For example, as shown in FIG. 2, the RTOA from UE to TRP0, the RTOA from UE to TRP1, and the RTOA from UE to TRP2 are measured, and the UE position is determined based on the geographical location and UL transmission timing of each TRP. may be calculated.

FIG. 4 is a diagram showing an example of measuring UL-RTOA. As shown in FIG. 4, the UL-RTOA may refer to the time difference between the reception start time of the UL subframe including the SRS of the TRP and the RTOA reference time at which the UL was transmitted.

Regarding the calculation of the UE position by UL-TDOA, the information shown in 1)-9) below may be reported from the gNB to the LMF.

1) PCI, GCI and TRP-ID of TRP controlled by gNB
2) Information related to the SSB of the TRP controlled by the gNB, such as time and frequency resources of the SSB 3) Information related to the geographic coordinates of the TRP controlled by the gNB 4) Measurement NCGI (NR Cell Global Identifier) and TRP-ID
5) UL-RTOA
6) RSRP of UL-SRS
7) Time of measurement 8) Quality of each measurement 9) Information regarding the beam of each measurement

UL-RTOA may be defined as the time difference between the reception start time of a UL subframe including SRS in TRP and the RTOA reference time at which UL was transmitted. The gNB may report the geographic coordinates of the TRP to the LMF via NRPPa.

FIG. 5 is a diagram showing an example (2) of positioning. As shown in FIG. 5, the location information of the UE may be calculated based on multiple RTTs. The location of the UE may be estimated based on UE/gNB reception-transmission time difference measurements using DL-PRS and UL-SRS. DL-PRS-RSRP and UL-SRS-RSRP may be used for this estimation. The LMF may determine the RTT using UE/gNB reception-transmission time difference measurements.

In the method based on multi-RTT, the location of the UE may be calculated using the following procedure.
1) gNB transmits DL-PRS from each TRP to UE 2) UE transmits SRS to multiple TRPs 3) UE transmits UE reception-transmission time difference to GW and UE via LPP 4) The gNB reports the gNB reception-transmission time difference to the LMF via NRPPa. 5) Based on the above information reported by the UE and gNB, the LMF determines the location of the UE. calculate

For example, as shown in FIG. 5, the RTT between UE and TRP0, the RTT between UE and TRP1, and the RTT between UE and TRP2 are measured, and the UE position is calculated based on the geographical position of each TRP. Good too.

FIG. 6 is a diagram showing an example of measuring RTT. As shown in FIG. 6, the UE reception-transmission time difference may refer to the time difference between the timing of receiving a DL subframe from the TRP and the timing of transmitting a UL subframe. Furthermore, as shown in FIG. 6, the gNB reception-transmission time difference may refer to the time difference between the timing at which the TRP receives the UL subframe and the timing at which the TRP transmits the DL subframe.

Regarding the calculation of the UE position using multiple RTTs, the information shown in 1) to 5) below may be reported from the UE to the GW/gNB/LMF.

1) PCI, GCI and TRP-ID in each measurement
2) DL-PRS-RSRP measurement results 3) UE reception-transmission time difference measurement results 4) Time of measurement 5) Quality of each measurement

Regarding the calculation of the UE position by RTT, the information shown in 1) to 9) below may be reported from the gNB to the LMF.

1) PCI, GCI and TRP-ID of TRP controlled by gNB
2) Timing information of TRPs controlled by gNB 3) DL-PRS settings of TRPs controlled by gNB 4) Information related to SSB of TRPs controlled by gNB, such as SSB time and frequency resources 5) Information of TRPs controlled by gNB Information regarding the spatial direction of DL-PRS 6) Information regarding the geographical coordinates of TRP controlled by gNB 7) Measurement NCGI and TRP-ID
8) gNB reception-transmission time difference 9) RSRP of UL-SRS
10) UL-AoA (Angle of Arrival), e.g. azimuth and elevation angle 11) Measurement time 12) Measurement quality 13) Information regarding the measurement beam

Note that you may refer to Non-Patent Document 6 for the definitions of the UE reception-transmission time difference and the gNB reception-transmission time difference. Similar to DL-RSTD, the geographic coordinates of the TRP may be reported.

As mentioned above, positioning using the Uu interface uses DL-TDOA, UL-TDOA, and multi-RTT positioning methods that use RSTD, RTOA, and reception-transmission time difference, which indicate the propagation delay between the UE and TRP, respectively. was.

Enhancement of positioning of UE (User Equipment) is being considered. For example, positioning in side links, positioning in NR, and positioning in RedCap (Reduced Capability) UEs are being considered. Especially in positioning in NR, LPHAP (Low Power High Accuracy Positioning) is being considered.

LPHAP uses PRACH (Physical Random Access Channel) as UL-PRS (Uplink Positioning Reference Signal) to support highly accurate positioning in RRC (Radio Resource Control) idle state (RRC_IDLE) or RRC inactive state (RRC_INACTIVE). ) Preamble is assumed to be used. A simple positioning function using the PRACH preamble is currently supported. However, with the current NR specifications, it is difficult to flexibly provide positioning using the PRACH preamble.

In addition, since the specification was made by reusing LTE's TA-based positioning, functional expansion is required to achieve positioning accuracy on the order of several meters, and the current NR specification uses high-precision positioning using the PRACH preamble. Positioning was difficult. As an example, the following NR specification will be explained.

FIG. 7 is a diagram showing an example of timing advance. As shown in FIG. 7, TA (Timing Advance) corresponds to the time difference _TTA between UL frame i and DL frame i, and may be determined by the following formula.
T _TA = (N _TA + serving cell specific offset + parameters related to NTN (Non-Terrestrial Network))・_TC
_NTA is a parameter updated by the TA command, and may be determined by the following formula.
_NTA = _TA・16・64/ ^2μ
T _A may be an integer from 0 to 3846.
Further, _TC may be determined by the following formula.
T _C =1/(Δf _max・N _f )
Δf _max =480・10 ³ , N _f =4096
Note that the subcarrier spacing SCS (SubCarrier Spacing) is 2 ^μ ·15 kHz. Further, the parameter related to NTN may be 0 in the case of a network other than NTN.

FIG. 8 is a diagram illustrating an example of reporting timing advances. As shown in FIG. 8, the values range from TIME_ADVANCE_00 to TIME_ADVANCE_7690 based on the value T _ADV measured at gNB. Note that T _ADV corresponds to gNB reception-transmission time difference (gNB RX-TX time difference) + serving cell-specific offset.

As shown in FIG. 8, the granularity of the timing advance report value in the gNB is 128· _TC for the reported values from TIME_ADVANCE_00 to TIME_ADVANCE_2047. Further, the granularity of the timing advance report value is 512· _TC for the reported values from TIME_ADVANCE_2048 to TIME_ADVANCE_7690.

For positioning in NR, a TA-based positioning function using TA (Timing Advance) using a PRACH preamble is supported. As mentioned above, the granularity of TA reporting in gNB is 128· _TC = 0.065 μs at its most detailed, and the report is made in steps of approximately 19.5 m, so the current NR specifications are based on position measurement of several meters. The positioning accuracy of the order cannot be satisfied.

Therefore, in the embodiment of the present invention, the following operations 1) to 6) will be explained as extended functions necessary to use the PRACH preamble for UL-PRS. Any number of actions may be performed simultaneously for actions 1)-6).

Operation 1) The UE may assume that the PRACH preamble is configured in the UL-PRS. The PRACH preamble may be called a PRACH preamble for positioning.
Operation 2) The UE may assume that the SCS of the PRACH preamble for positioning is defined.
Operation 3) The UE may assume that the number of RBs and/or sequence length of the PRACH preamble for positioning is defined.
Operation 4) The UE may assume that a PRACH preamble power ramping step for positioning is defined.
Operation 5) The UE may assume that the RA response timing of the PRACH preamble for positioning is defined.
Action 6) It may be assumed that the TA reporting granularity of the PRACH preamble for positioning is defined.

Hereinafter, operation 1) the UE may assume that a PRACH preamble is set in the UL-PRS will be described.

FIG. 9 is a diagram showing an example of a message in the embodiment of the present invention. As shown in FIG. 9, the base station 10 may transmit an RRC Release message to the terminal 20 (see Non-Patent Document 7). The RRCRelease message is a message sent from the network when the UE transitions to the RRC_INACTIVE state or the RRC_IDLE state. The UE may assume that the configuration of the PRACH preamble for positioning is notified by the RRC Release message.

It may be assumed that different settings of the PRACH preamble for positioning are notified in the RRC_INACTIVE state and the RRC_IDLE state, or it may be assumed that a common setting is notified.

FIG. 10 is a diagram showing an example (1) of specification change in the embodiment of the present invention. SuspendConfig shown in FIG. 10 is an information element included in the RRC Release message (see Non-Patent Document 7). As shown in FIG. 10, "RA-Preamble-PosRRC-InactiveConfig-r17" may be defined as an information element indicating the configuration of the PRACH preamble for positioning. The information element "RA-Preamble-PosRRC-InactiveConfig-r17" may include parameters for making settings related to the above operations 2) to 6). Note that the name of the information element is just an example, and other names may be used.

The UE may also assume that the transmission of a PRACH preamble for positioning is required. The UE may assume that the request message is signaled on the following channels or signals: For example, transmission of a PRACH preamble for positioning is required in CG-SDT (Configured Grant-based Small Data Transmission), RA-SDT, SIB (System Information Block), SIB1, SIB2, SIBpos (see Non-Patent Document 7), etc. It may be assumed that

The UE may also assume that the configuration update of the PRACH preamble for positioning is notified. The UE may assume that the configuration update message is notified on the following channels or signals: For example, CG-SDT, RA-SDT, SIB, SIB1, SIB2, SIBpos, Msg. 2 (RAR, Random Access Response), RRC Release message, etc., it may be assumed that the setting update of the PRACH preamble for positioning is notified.

Additionally, the UE may assume that the transmission of the PRACH preamble for positioning is requested at a specific timing. For example, the type of the request message and/or the reception timing information (e.g., time period, frequency/time resource) of the request message are uniquely defined in the specifications, and the UE It may be assumed that a message requesting transmission of a PRACH preamble for positioning is monitored only at a timing corresponding to the reception timing information of . For example, the UE may envisage monitoring a message requesting the transmission of a positioning PRACH preamble on a particular time resource and/or a particular frequency resource.

The above operation 1) enables UL positioning using the PRACH preamble in the RRC_INACTIVE state or the RRC_IDLE state.

Hereinafter, operation 2) in which the UE may assume that the SCS of the PRACH preamble for positioning is defined will be described.

For example, it may be assumed that the SCS of the PRACH preamble for positioning is notified separately from the SCS of the normal PRACH preamble. Hereinafter, the normal PRACH will be temporarily referred to as a common PRACH. For example, the SCS of the PRACH preamble for positioning may be {1.25, 5, 15, 30, 60, 120, 240, 480} kHz. Further, for example, the SCS of the PRACH preamble for positioning may be {120, 240, 480, 960} kHz.

For example, the SCS of the PRACH preamble for positioning may be uniquely determined by the specifications. For example, the SCS of the PRACH preamble for positioning may be determined to be 120 kHz.

For example, the SCS of the PRACH preamble for positioning may be determined from the number of RBs of the PRACH preamble for positioning and the SCS of other channels (PUSCH, common PRACH preamble). For example, a table may be defined in the specifications that shows the correspondence between the SCS of the PRACH preamble for positioning and the number of RBs of the PRACH preamble for positioning and/or the SCS of other channels. That is, the SCS of the PRACH preamble for positioning may be associated with the number of RBs of the PRACH preamble for positioning and/or the SCS of other channels.

With the above operation 2), different SCSs can be used for the normal PRACH preamble and the positioning PRACH preamble. In other words, flexibility in settings is improved.

Hereinafter, operation 3) in which the UE may assume that the number of RBs and/or sequence length of the PRACH preamble for positioning is defined will be described. Any of the actions shown below from option 1) to option 3) may be performed.

Option 1) The UE may assume that the number of RBs and/or sequence length of the positioning PRACH preamble may be different from the common PRACH preamble. For example, the UE may assume that the number of RBs and/or sequence length of the PRACH preamble for positioning is notified in the RRC Release message.

For example, it may be assumed that the UE determines the number of RBs and/or sequence length of the positioning PRACH preamble based on the SCS of multiple channels or signals. For example, the UE may determine the number of RBs and/or sequence length of the PRACH preamble for positioning based on the type or parameter of the PRACH preamble for positioning and the SCS of the PUSCH. For example, the UE may determine the number of RBs and/or sequence length of the PRACH preamble for positioning based on the type or parameter of the PRACH preamble for positioning and the SCS of the common PRACH preamble.

Option 2) The UE may assume that the number of RBs and/or sequence length of the positioning PRACH preamble is the same as the common PRACH preamble.

Option 3) The UE may envisage switching between option 1) and option 2). For example, the UE may switch between option 1) and option 2) using RRC signaling, MAC-CE, or DCI notified from the base station 10.

Furthermore, the UE may assume that the number of frequency resources (for example, 12×number of RBs (N_rb)) and the sequence length (for example, L_s) of the notified PRACH preamble for positioning are different.

FIG. 11 is a diagram showing an example of PRACH in the embodiment of the present invention. As shown in FIG. 11, if 12×N_rb>L_s, the UE may repeat the notified PRACH preamble sequence and assume mapping to 12×N_rb resources. FIG. 11 shows an example in which the PRACH preamble sequence is repeated four times. For example, the UE may assume that a parameter indicating the number of repetitions of the PRACH preamble sequence is informed via RRC signaling, MAC-CE or DCI.

The above operation 3) enables the use of different RB numbers and/or sequence lengths for the normal PRACH preamble and the positioning PRACH preamble. In other words, flexibility in settings is improved.

Operation 4) The UE may assume that a PRACH preamble power ramping step for positioning is defined.

FIG. 12 is a diagram showing an example (2) of specification change in the embodiment of the present invention. For example, as in case 1 shown in FIG. 12, the information element "powerRampingStepPos" indicating a candidate set of power ramping step values for the PRACH preamble for positioning may include the power ramping step value for the common PRACH preamble. In the example of FIG. 12, one of {dB0, dB2, dB4, dB6, dB8, dB10, dB12} is set by "powerRampingStepPos". If the power ramping step value of the PRACH preamble for positioning is not notified, the UE may read the power ramping step value of the common PRACH preamble as the power ramping step value of the PRACH preamble for positioning.

For example, as in case 2 shown in FIG. 12, the information element "powerRampingStepPos" indicating a candidate set of power ramping step values of the PRACH preamble for positioning does not need to include the power ramping step value of the common PRACH preamble. In the example of FIG. 12, one of {dB8, dB10, dB12} is set by "powerRampingStepPos". The UE may assume that when a PRACH preamble is configured in the UL-PRS, the power ramping step value of the PRACH preamble for positioning is always notified.

Note that RACH-ConfigGeneric is an information element that includes settings related to random access (see Non-Patent Document 7). The name of the information element "powerRampingStepPos" is an example, and other names may be used.

By setting the power ramping step of the PRACH preamble for positioning to a large value through the above-described operation 4), random access can be quickly completed and positioning can be performed with low delay.

Hereinafter, operation 5) in which the UE may assume that the RA response timing of the PRACH preamble for positioning is defined will be described.

For example, the RA response window value of the common PRACH preamble may be included in the candidate set of RA response window values of the PRACH preamble for positioning. If the RA response window value of the PRACH preamble for positioning is not notified, the UE may read the RA response window value of the common PRACH preamble as the RA response window value of the PRACH preamble for positioning.

For example, the RA response window value of the common PRACH preamble may not be included in the candidate set of RA response window values of the PRACH preamble for positioning. The UE may assume that when a PRACH preamble is configured in the UL-PRS, the RA response window value of the PRACH preamble for positioning is always notified.

FIG. 13 is a diagram showing an example (3) of specification change in the embodiment of the present invention. As shown in FIG. 13, it may be assumed that the RA response window value of the PRACH preamble for positioning is reported as a value of less than one slot. In the example of FIG. 13, the information element "ra-ResponseWindowPos" notifies one of 0.2 slot, 0.4 slot, 0.8 slot, and 1 slot.

Note that RACH-ConfigGeneric is an information element that includes settings related to random access (see Non-Patent Document 7). The name of the information element "ra-ResponseWindowPos" is an example, and other names may be used.

By setting the RA response window of the PRACH preamble for positioning short through the above-described operation 5), random access can be quickly completed and positioning can be performed with low delay.

Hereinafter, operation 6) It may be assumed that the TA reporting granularity of the PRACH preamble for positioning is defined.

For example, it may be assumed that one reporting granularity is defined as X·T _C (X<128). For example, X may be uniquely defined in the specification. For example, X=64. The TA value may be reported from the gNB to the LMF based on Table 1.

The example shown in Table 1 is for X=64. By reporting the TA value from gNB to LMF based on Table 1, a ±5 ms error can be achieved.

Further, for example, it may be assumed that two or more X·T _C (X<128) are defined as the report granularity. For example, X may be uniquely defined in the specification. For example, X={64, 32, 16}. The TA value may be reported from the gNB to the LMF based on Table 2.

The example shown in Table 2 is a case where X={64, 32, 16}. When reporting the TA value from gNB to LMF based on Table 2, if X=32, a ±2.5 ms error can be achieved. If X=16, an error of ±1.25 ms can be achieved.

The above operation 6) makes it possible to report finer granularity of TA values to the LMF, making it possible to support positioning on the order of several meters.

The PRACH preamble for positioning is the same as the RACH preamble for positioning, the RA preamble for positioning, the PRACH for positioning, and the RACH preamble for positioning. RA for positioning), RA for positioning, etc.

Note that the embodiments of the present invention may be applied not only to the RRC_IDLE state but also to the RRC_INACTIVE state.

Note that in the embodiment of the present invention, the PRACH preamble may refer to Msg1 in a 4-step random access procedure, or may refer to MsgA in a 2-step random access procedure.

Note that the PRACH preamble for positioning is not defined in the specifications, and may be assumed to be the same signal as the PRACH preamble.

In addition, "set from the network" can be read as "set by RRC signaling," "activate/deactivate/update by MAC-CE," "indicate by DCI," etc. It's okay to be hit.

According to the above embodiment, the terminal 20 can perform positioning using the PRACH preamble in the RRC_INACTIVE state or the RRC_IDLE state. Further, by setting different settings for the normal PRACH preamble and the positioning PRACH preamble, it is possible to use a signal suitable for positioning. Furthermore, it becomes possible to report TA values with finer granularity to the LMF, and it is possible to support positioning on the order of several meters.

That is, in a wireless communication system, it is possible to provide a function necessary for positioning using a random access channel preamble.

(Device configuration)
Next, an example of the functional configuration of the base station 10 and terminal 20 that execute the processes and operations described above will be described. Base station 10 and terminal 20 include functionality to implement the embodiments described above. However, the base station 10 and the terminal 20 may each have only some of the functions in the embodiment.

<Base station 10>
FIG. 14 is a diagram showing an example of the functional configuration of the base station 10. As shown in FIG. 14, base station 10 includes a transmitting section 110, a receiving section 120, a setting section 130, and a control section 140. The functional configuration shown in FIG. 14 is only an example. As long as the operations according to the embodiments of the present invention can be executed, the functional divisions and functional parts may have any names.

The transmitting unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly. The transmitting unit 110 also transmits network node-to-network messages to other network nodes. The receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information on a higher layer from the received signals. Furthermore, the transmitter 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL/UL control signals, etc. to the terminal 20. Further, the receiving unit 120 receives messages between network nodes from other network nodes.

The setting unit 130 stores setting information set in advance and various setting information to be sent to the terminal 20. The content of the setting information is, for example, information related to positioning settings.

As described in the embodiment, the control unit 140 performs control related to positioning settings. Further, the control unit 140 executes scheduling. A functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and a functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120.

<Terminal 20>
FIG. 15 is a diagram showing an example of the functional configuration of the terminal 20. As shown in FIG. 15, the terminal 20 includes a transmitting section 210, a receiving section 220, a setting section 230, and a control section 240. The functional configuration shown in FIG. 15 is only an example. As long as the operations according to the embodiments of the present invention can be executed, the functional divisions and functional parts may have any names.

The transmitter 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal. The receiving unit 220 wirelessly receives various signals and obtains higher layer signals from the received physical layer signals. Further, the receiving unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL/UL/SL control signals, etc. transmitted from the base station 10. For example, the transmitter 210 transmits a PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel) to another terminal 20 as D2D communication. The receiving unit 220 receives PSCCH, PSSCH, PSDCH, PSBCH, etc. from other terminals 20 .

The setting section 230 stores various setting information received from the base station 10 by the receiving section 220. The setting unit 230 also stores setting information that is set in advance. The content of the setting information is, for example, information related to positioning settings.

As described in the embodiment, the control unit 240 performs control related to positioning settings. A functional unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and a functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220.

(Hardware configuration)
The block diagrams (FIGS. 14 and 15) used to explain the above embodiments show blocks in functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or may be realized using two or more physically or logically separated devices directly or indirectly (e.g. , wired, wireless, etc.) and may be realized using a plurality of these devices. The functional block may be realized by combining software with the one device or the plurality of devices.

Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, These include, but are not limited to, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning. I can't. For example, a functional block (configuration unit) that performs transmission is called a transmitting unit or a transmitter. In either case, as described above, the implementation method is not particularly limited.

For example, the base station 10, terminal 20, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. FIG. 16 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and terminal 20 described above are physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc. Good too.

Note that in the following description, the word "apparatus" can be read as a circuit, device, unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured not to include some of the devices.

Each function in the base station 10 and the terminal 20 is performed by loading predetermined software (programs) onto hardware such as the processor 1001 and the storage device 1002, so that the processor 1001 performs calculations and controls communication by the communication device 1004. This is realized by controlling at least one of reading and writing data in the storage device 1002 and the auxiliary storage device 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, registers, and the like. For example, the above-described control unit 140, control unit 240, etc. may be implemented by the processor 1001.

Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes in accordance with these. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. For example, the control unit 140 of the base station 10 shown in FIG. 14 may be realized by a control program stored in the storage device 1002 and operated on the processor 1001. Further, for example, the control unit 240 of the terminal 20 shown in FIG. 15 may be realized by a control program stored in the storage device 1002 and operated on the processor 1001. Although the various processes described above have been described as being executed by one processor 1001, they may be executed by two or more processors 1001 simultaneously or sequentially. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunications line.

The storage device 1002 is a computer-readable recording medium, such as at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. may be configured. The storage device 1002 may be called a register, cache, main memory, or the like. The storage device 1002 can store executable programs (program codes), software modules, and the like to implement a communication method according to an embodiment of the present disclosure.

The auxiliary storage device 1003 is a computer-readable recording medium, such as an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu-ray disk, etc.). -ray disk), smart card, flash memory (eg, card, stick, key drive), floppy disk, magnetic strip, etc. The above-mentioned storage medium may be, for example, a database including at least one of the storage device 1002 and the auxiliary storage device 1003, a server, or other suitable medium.

The communication device 1004 is hardware (transmission/reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc., for example. The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of. For example, a transmitting/receiving antenna, an amplifier section, a transmitting/receiving section, a transmission line interface, etc. may be realized by the communication device 1004. The transmitting and receiving unit may be physically or logically separated into a transmitting unit and a receiving unit.

The input device 1005 is an input device (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Further, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses for each device.

The base station 10 and the terminal 20 also include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA). A part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these hardwares.

FIG. 17 shows an example of the configuration of the vehicle 2001. As shown in FIG. 17, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, a front wheel 2007, a rear wheel 2008, an axle 2009, an electronic control unit 2010, and various sensors 2021 to 2029. , an information service section 2012 and a communication module 2013. Each aspect/embodiment described in this disclosure may be applied to a communication device mounted on vehicle 2001, for example, may be applied to communication module 2013.

The drive unit 2002 is composed of, for example, an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also referred to as a steering wheel), and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

The electronic control unit 2010 is composed of a microprocessor 2031, memory (ROM, RAM) 2032, and communication port (IO port) 2033. Signals from various sensors 2021 to 2029 provided in the vehicle 2001 are input to the electronic control unit 2010. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

Signals from various sensors 2021 to 2029 include a current signal from a current sensor 2021 that senses the motor current, a front wheel and rear wheel rotation speed signal obtained by a rotation speed sensor 2022, and a front wheel rotation speed signal obtained by an air pressure sensor 2023. and rear wheel air pressure signals, vehicle speed signals acquired by vehicle speed sensor 2024, acceleration signals acquired by acceleration sensor 2025, accelerator pedal depression amount signals acquired by accelerator pedal sensor 2029, and brake pedal sensor 2026. These include a brake pedal depression amount signal, a shift lever operation signal acquired by the shift lever sensor 2027, a detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by the object detection sensor 2028, and the like.

The information service department 2012 controls various devices such as car navigation systems, audio systems, speakers, televisions, and radios that provide (output) various information such as driving information, traffic information, and entertainment information, and these devices. It is composed of one or more ECUs. The information service unit 2012 provides various multimedia information and multimedia services to the occupants of the vehicle 2001 using information acquired from an external device via the communication module 2013 and the like. The information service department 2012 may include an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accepts input from the outside, and an output device that performs output to the outside (for example, display, speaker, LED lamp, touch panel, etc.).

The driving support system unit 2030 includes a millimeter wave radar, LiDAR (Light Detection and Ranging), a camera, a positioning locator (e.g., GNSS, etc.), map information (e.g., high-definition (HD) map, autonomous vehicle (AV) map, etc.) ), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors that prevent accidents and reduce the driver's driving burden. The system is comprised of various devices that provide functions for the purpose and one or more ECUs that control these devices. Further, the driving support system unit 2030 transmits and receives various information via the communication module 2013, and realizes a driving support function or an automatic driving function.

Communication module 2013 can communicate with microprocessor 2031 and components of vehicle 2001 via a communication port. For example, the communication module 2013 communicates with the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, electronic Data is transmitted and received between the microprocessor 2031, memory (ROM, RAM) 2032, and sensors 2021 to 29 in the control unit 2010.

The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with external devices. For example, various information is transmitted and received with an external device via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station, a mobile station, or the like.

The communication module 2013 receives signals from the various sensors 2021 to 2028 described above that are input to the electronic control unit 2010, information obtained based on the signals, and input from the outside (user) obtained via the information service unit 2012. At least one of the information based on the information may be transmitted to an external device via wireless communication. The electronic control unit 2010, various sensors 2021-2028, information service unit 2012, etc. may be called an input unit that receives input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above input.

The communication module 2013 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device, and displays it on the information service section 2012 provided in the vehicle 2001. The information service unit 2012 is an output unit that outputs information (for example, outputs information to devices such as a display and a speaker based on the PDSCH (or data/information decoded from the PDSCH) received by the communication module 2013). may be called. Communication module 2013 also stores various information received from external devices into memory 2032 that can be used by microprocessor 2031 . Based on the information stored in the memory 2032, the microprocessor 2031 controls the drive section 2002, steering section 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheel 2007, rear wheel 2008, and axle 2009 provided in the vehicle 2001. , sensors 2021 to 2029, etc. may be controlled.

(Summary of embodiments)
As described above, according to the embodiment of the present invention, there is provided a receiving unit that receives an RRC message from a base station that is notified when transitioning to an RRC (Radio Resource Control) idle state or an RRC inactive state; A terminal is provided that includes a transmitter that transmits the PRACH (Physical Random Access Channel) preamble for positioning to the base station based on settings related to the PRACH (Physical Random Access Channel) preamble for positioning included in the RRC message.

The above configuration enables the terminal 20 to perform positioning using the PRACH preamble in the RRC_INACTIVE state or the RRC_IDLE state. That is, in a wireless communication system, it is possible to provide a function necessary for positioning using a preamble of a random access channel.

The transmitter may determine a subcarrier interval to be applied to the positioning PRACH preamble based on a subcarrier interval of a certain channel. With this configuration, by setting different settings for the normal PRACH preamble and the positioning PRACH preamble, it is possible to use a signal suitable for positioning.

The transmitter may assume that the number of frequency resources and sequence length of the PRACH preamble for positioning are different. With this configuration, by setting different settings for the normal PRACH preamble and the positioning PRACH preamble, it is possible to use a signal suitable for positioning.

When the setting value candidates related to the PRACH preamble for positioning include a setting value related to a normal preamble, and when the setting value of the PRACH preamble for positioning is not notified, the transmitting unit transmits the The setting values related to the normal preamble may be read as the setting values of the PRACH preamble for positioning. With this configuration, it is possible to reduce the signaling overhead related to the setting of the positioning PRACH preamble.

The transmitter assumes that when the setting value candidates for the PRACH preamble for positioning do not include a setting value for a normal preamble, the setting value for the PRACH preamble for positioning will always be notified. Good too. With this configuration, by setting different settings for the normal PRACH preamble and the positioning PRACH preamble, it is possible to use a signal suitable for positioning.

Further, according to an embodiment of the present invention, there is provided a reception procedure for receiving an RRC message from a base station that is notified when transitioning to an RRC (Radio Resource Control) idle state or an RRC inactive state; A positioning method is provided in which a terminal executes a transmission procedure for transmitting the PRACH (Physical Random Access Channel) preamble for positioning to the base station based on settings related to a PRACH (Physical Random Access Channel) preamble for positioning.

(Supplementary information on the embodiment)
Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, modifications, alternatives, replacements, etc. Probably. Although the invention has been explained using specific numerical examples to facilitate understanding of the invention, unless otherwise specified, these numerical values are merely examples, and any appropriate values may be used. The classification of items in the above explanation is not essential to the present invention, and matters described in two or more items may be used in combination as necessary, and matters described in one item may be used in another item. may be applied to the matters described in (unless inconsistent). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical components. The operations of a plurality of functional sections may be physically performed by one component, or the operations of one functional section may be physically performed by a plurality of components. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as there is no contradiction. Although the base station 10 and the terminal 20 have been described using functional block diagrams for convenience of process description, such devices may be implemented in hardware, software, or a combination thereof. Software operated by the processor included in the base station 10 according to the embodiment of the present invention and software operated by the processor included in the terminal 20 according to the embodiment of the present invention are respectively random access memory (RAM), flash memory, and read-only memory. (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

Furthermore, the notification of information is not limited to the aspects/embodiments described in this disclosure, and may be performed using other methods. For example, the notification of information may be physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling). , broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. Further, RRC signaling may be called an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

Each aspect/embodiment described in this disclosure is LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system). system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is an integer or decimal number, for example)), FRA (Future Radio Access), NR (new Radio), New radio access ( NX), Future generation radio access (FX), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802 Systems that utilize .16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other appropriate systems, and that are extended, modified, created, and defined based on these. The present invention may be applied to at least one of the next generation systems. Furthermore, a combination of a plurality of systems may be applied (for example, a combination of at least one of LTE and LTE-A and 5G).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this specification may be changed as long as there is no contradiction. For example, the methods described in this disclosure use an example order to present elements of the various steps and are not limited to the particular order presented.

In this specification, specific operations performed by the base station 10 may be performed by its upper node in some cases. In a network consisting of one or more network nodes including a base station 10, various operations performed for communication with a terminal 20 are performed by the base station 10 and other network nodes other than the base station 10. It is clear that this can be done by at least one of the following: for example, MME or S-GW (possible, but not limited to). Although the case where there is one network node other than the base station 10 is illustrated above, the other network node may be a combination of multiple other network nodes (for example, MME and S-GW). .

The information, signals, etc. described in this disclosure can be output from an upper layer (or lower layer) to a lower layer (or upper layer). It may be input/output via multiple network nodes.

The input/output information may be stored in a specific location (for example, memory) or may be managed using a management table. Information etc. to be input/output may be overwritten, updated, or additionally written. The output information etc. may be deleted. The input information etc. may be transmitted to other devices.

The determination in the present disclosure may be performed based on a value represented by 1 bit (0 or 1), a truth value (Boolean: true or false), or a comparison of numerical values (e.g. , comparison with a predetermined value).

Software includes instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name. , should be broadly construed to mean an application, software application, software package, routine, subroutine, object, executable, thread of execution, procedure, function, etc.

Additionally, software, instructions, information, etc. may be sent and received via a transmission medium. For example, if the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) to create a website, When transmitted from a server or other remote source, these wired and/or wireless technologies are included within the definition of transmission medium.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be referred to throughout the above description, may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may also be represented by a combination of

Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and the symbol may be a signal. Also, the signal may be a message. Further, a component carrier (CC) may also be called a carrier frequency, a cell, a frequency carrier, or the like.

As used in this disclosure, the terms "system" and "network" are used interchangeably.

In addition, the information, parameters, etc. described in this disclosure may be expressed using absolute values, relative values from a predetermined value, or using other corresponding information. may be expressed. For example, radio resources may be indicated by an index.

The names used for the parameters mentioned above are not restrictive in any respect. Furthermore, the mathematical formulas etc. using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (e.g. PUCCH, PDCCH, etc.) and information elements may be identified by any suitable designation, the various names assigned to these various channels and information elements are in no way exclusive designations. isn't it.

In this disclosure, "Base Station (BS)," "wireless base station," "base station," "fixed station," "NodeB," "eNodeB (eNB)," and "gNodeB ( gNB)”, “access point”, “transmission point”, “reception point”, “transmission/reception point”, “cell”, “sector”, Terms such as "cell group," "carrier," "component carrier" and the like may be used interchangeably. A base station may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

A base station can accommodate one or more (eg, three) cells. If a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is divided into multiple subsystems (e.g., small indoor base stations (RRHs)). Communication services can also be provided by Remote Radio Head). The term "cell" or "sector" refers to part or all of the coverage area of a base station and/or base station subsystem that provides communication services in this coverage.

In the present disclosure, the base station transmitting information to the terminal may be read as the base station instructing the terminal to control/operate based on the information.

In this disclosure, terms such as "mobile station (MS)," "user terminal," "user equipment (UE)," and "terminal" may be used interchangeably. .

A mobile station is defined by a person skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

At least one of the base station and the mobile station may be called a transmitting device, receiving device, communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, or the like. The moving object may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving object (for example, a drone, a self-driving car, etc.), or a robot (manned or unmanned). ). Note that at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

Additionally, the base station in the present disclosure may be replaced by a user terminal. For example, communication between a base station and a user terminal is replaced with communication between a plurality of terminals 20 (for example, it may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). Regarding the configuration, each aspect/embodiment of the present disclosure may be applied. In this case, the terminal 20 may have the functions that the base station 10 described above has. Further, words such as "up" and "down" may be replaced with words corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may be replaced with side channels.

Similarly, the user terminal in the present disclosure may be replaced with a base station. In this case, the base station may have the functions that the user terminal described above has.

As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of operations. "Judgment" and "decision" include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, search, and inquiry. (e.g., searching in a table, database, or other data structure), and regarding an ascertaining as a "judgment" or "decision." In addition, "judgment" and "decision" refer to receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and access. (accessing) (e.g., accessing data in memory) may include considering something as a "judgment" or "decision." In addition, "judgment" and "decision" refer to resolving, selecting, choosing, establishing, comparing, etc. as "judgment" and "decision". may be included. In other words, "judgment" and "decision" may include regarding some action as having been "judged" or "determined." Further, "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

The terms "connected", "coupled", or any variations thereof, refer to any connection or coupling, direct or indirect, between two or more elements and to each other. It may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled." The bonds or connections between elements may be physical, logical, or a combination thereof. For example, "connection" may be replaced with "access." As used in this disclosure, two elements may include one or more electrical wires, cables, and/or printed electrical connections, as well as in the radio frequency domain, as some non-limiting and non-inclusive examples. , electromagnetic energy having wavelengths in the microwave and optical (both visible and non-visible) ranges.

The reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot depending on the applied standard.

As used in this disclosure, the phrase "based on" does not mean "based solely on" unless explicitly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

As used in this disclosure, any reference to elements using the designations "first," "second," etc. does not generally limit the amount or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, reference to a first and second element does not imply that only two elements may be employed or that the first element must precede the second element in any way.

"Means" in the configurations of each of the above devices may be replaced with "unit", "circuit", "device", etc.

Where "include", "including" and variations thereof are used in this disclosure, these terms, like the term "comprising," are inclusive. It is intended that Furthermore, the term "or" as used in this disclosure is not intended to be exclusive or.

A radio frame may be composed of one or more frames in the time domain. Each frame or frames in the time domain may be called a subframe. A subframe may also be composed of one or more slots in the time domain. A subframe may be a fixed time length (eg, 1 ms) that is independent of numerology.

The numerology may be a communication parameter applied to the transmission and/or reception of a certain signal or channel. Numerology includes, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, and transceiver It may also indicate at least one of a specific filtering process performed in the frequency domain, a specific windowing process performed by the transceiver in the time domain, and the like.

A slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. A slot may be a unit of time based on numerology.

A slot may include multiple mini-slots. Each minislot may be made up of one or more symbols in the time domain. Furthermore, a mini-slot may also be called a sub-slot. A minislot may be made up of fewer symbols than a slot. PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (or PUSCH) mapping type A. PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (or PUSCH) mapping type B.

Radio frames, subframes, slots, minislots, and symbols all represent time units when transmitting signals. Other names may be used for the radio frame, subframe, slot, minislot, and symbol.

For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, and one slot or one minislot may be called a TTI. It's okay. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. It may be. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each terminal 20) to each terminal 20 on a TTI basis. Note that the definition of TTI is not limited to this.

The TTI may be a transmission time unit of a channel-coded data packet (transport block), a code block, a codeword, etc., or may be a processing unit of scheduling, link adaptation, etc. Note that when a TTI is given, the time interval (for example, the number of symbols) to which transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI.

Note that when one slot or one minislot is called a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum time unit for scheduling. Further, the number of slots (minislot number) that constitutes the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI that is shorter than the normal TTI may be referred to as an abbreviated TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

Note that long TTI (for example, normal TTI, subframe, etc.) may be read as TTI with a time length exceeding 1 ms, and short TTI (for example, short TTI, etc.) It may also be read as a TTI having the above TTI length.

A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more continuous subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be 12, for example. The number of subcarriers included in an RB may be determined based on numerology.

Additionally, the time domain of an RB may include one or more symbols, and may be one slot, one minislot, one subframe, or one TTI in length. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

Note that one or more RBs include physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc. May be called.

Additionally, a resource block may be configured by one or more resource elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

A bandwidth part (BWP) (which may also be called a partial bandwidth or the like) may represent a subset of consecutive common resource blocks (RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by an RB index based on a common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

The BWP may include a UL BWP (UL BWP) and a DL BWP (DL BWP). One or more BWPs may be configured for the terminal 20 within one carrier.

At least one of the configured BWPs may be active, and the terminal 20 does not need to assume that it transmits or receives a given signal/channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

The structures of radio frames, subframes, slots, minislots, symbols, etc. described above are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of symbols included in an RB, The number of subcarriers, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

In this disclosure, when articles are added by translation, such as a, an, and the in English, the present disclosure may include that the nouns following these articles are plural.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." Note that the term may also mean that "A and B are each different from C". Terms such as "separate" and "coupled" may also be interpreted similarly to "different."

Each aspect/embodiment described in this disclosure may be used alone, in combination, or may be switched and used in accordance with execution. In addition, notification of prescribed information (for example, notification of "X") is not limited to being done explicitly, but may also be done implicitly (for example, not notifying the prescribed information). Good too.

Although the present disclosure has been described in detail above, it is clear for those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure as determined by the claims. Therefore, the description of the present disclosure is for the purpose of illustrative explanation and is not intended to have any limiting meaning on the present disclosure.

10 Base station 110 Transmitting section 120 Receiving section 130 Setting section 140 Control section 20 Terminal 210 Transmitting section 220 Receiving section 230 Setting section 240 Control section 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device 2001 Vehicle 2002 Drive section 2003 Steering section 2004 Accelerator pedal 2005 Brake pedal 2006 Shift lever 2007 Front wheel 2008 Rear wheel 2009 Axle 2010 Electronic control section 2012 Information service section 2013 Communication module 2021 Current sensor 2022 Rotational speed sensor 2023 Air pressure sensor 2024 Vehicle speed sensor 2025 Acceleration sensor 2026 Brake Pedal sensor 2027 Shift lever sensor 2028 Object detection sensor 2029 Accelerator pedal sensor 2030 Driving support system section 2031 Microprocessor 2032 Memory (ROM, RAM)
2033 Communication port (IO port)

Claims

a receiving unit that receives an RRC message from a base station that is notified when transitioning to an RRC (Radio Resource Control) idle state or RRC inactive state;
A terminal comprising a transmitting unit that transmits the PRACH (Physical Random Access Channel) preamble for positioning to the base station based on settings related to the PRACH (Physical Random Access Channel) preamble for positioning included in the RRC message.
The terminal according to claim 1, wherein the transmitter determines a subcarrier interval to be applied to the positioning PRACH preamble based on a subcarrier interval of a certain channel.
The terminal according to claim 1, wherein the transmitter assumes that the number of frequency resources and sequence length of the PRACH preamble for positioning are different.
When the setting value candidates related to the PRACH preamble for positioning include a setting value related to a normal preamble, and when the setting value of the PRACH preamble for positioning is not notified, the transmitting unit transmits the The terminal according to claim 1, wherein a setting value related to a normal preamble is read as a setting value of the PRACH preamble for positioning.
The transmission unit assumes that when the setting value candidates for the PRACH preamble for positioning do not include a setting value for a normal preamble, the setting value for the PRACH preamble for positioning is always notified. The terminal described in item 1.
a reception procedure for receiving an RRC message from a base station that is notified when transitioning to an RRC (Radio Resource Control) idle state or RRC inactive state;
A positioning method in which a terminal performs a transmission procedure of transmitting a PRACH (Physical Random Access Channel) preamble for positioning to the base station based on a setting related to a PRACH (Physical Random Access Channel) preamble for positioning included in the RRC message.