WO2019004727A1 - Method for tracking position of vehicle in wireless communication system and apparatus therefor - Google Patents

Abstract

The present specification provides a method for tracking the position of a vehicle using a wireless communication system. Specifically, the method performed by the vehicle comprises the steps of: receiving, from a network, a capability request message requesting whether the vehicle has the capability of collecting information on lanes; transmitting, to the network, a capability response message indicating a response to the capability request message; obtaining lane information on the current lane of the vehicle, by using a sensor for recognizing the lanes; and transmitting the obtained lane information to the network. As such, the present specification has the effect of tracking the position of the vehicle with greater accuracy.

Description

Method for tracking the position of a vehicle in a wireless communication system and apparatus therefor

Field of the Invention [0002] The present invention relates to a wireless communication system, and more particularly, to a method for tracking a position of a vehicle in a wireless communication system and an apparatus for supporting the same.

The mobile communication system has been developed to provide voice service while ensuring the user 's activity. However, in the mobile communication system, not only the voice but also the data service are extended. At present, due to the increase of the explosive traffic, there is a shortage of resources and users require higher speed service, have.

The requirements of the next-generation mobile communication system largely depend on the acceptance of explosive data traffic, the dramatic increase in the rate per user, the acceptance of a significantly increased number of connected devices, very low end-to-end latency, Should be able to. For this purpose, a dual connectivity, a massive multiple input multiple output (MIMO), an in-band full duplex, a non-orthogonal multiple access (NOMA) wideband support, and device networking.

It is an object of the present invention to provide a method for tracking the position of a vehicle using lane information.

The technical objects to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical subjects which are not mentioned are described in the following description, which will be clearly understood by those skilled in the art to which the present invention belongs It will be possible.

A method for tracking a location of a vehicle in a wireless communication system, the method comprising the steps of: requesting whether the vehicle is capable of collecting information about a line of vehicle Receiving a capability request message from a network; Sending a capability response message to the network indicating a response to the capability request message; Obtaining lane information indicating which lane the currently running lane is by using a sensor recognizing the lane; And transmitting the obtained lane information to the network.

Further, in the present specification, the lane information is quantized based on a value related to the number of lanes and a quantization level.

In this specification, the first part of the quantization level is a value representing a lane on which the vehicle is running, and the second part is a value indicating a distance between the center of the lane on which the vehicle is running and the vehicle .

Also, the method may further include receiving control information associated with a road that is currently running from the network.

Further, in the present specification, the control information includes at least one of information indicating the total number of lanes of the road or information indicating the number of one-way lanes.

Further, in the present specification, the capability response message includes a vehicle identifier (ID) for identifying the vehicle.

Further, in this specification, the sensor is a vision sensor.

In this specification, the ability to collect information about the lane is determined by the presence or absence of the sensor.

Also disclosed is a vehicle for tracking a location in a wireless communication system, comprising: a sensor for recognizing a lane; An RF (Radio Frequency) module for transmitting and receiving a radio signal; And a processor operatively connected to the RF module and the sensor for controlling the vehicle, the processor comprising: a capability requesting unit operable to request a capability to collect information about a line of vehicle control the RF module to receive a capability request message from the network; Control the RF module to send a capability response message to the network indicating a response to the capability request message; Control the sensor to obtain lane information indicating which lane the currently running lane is; And controlling the RF module to transmit the obtained lane information to the network.

The present invention has the effect of more efficiently estimating the position of the vehicle using information about the lane through the sensor and distance information between the vehicle and the RSU.

The effects obtained in the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description .

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the technical features of the invention.

1 shows a structure of a radio frame in a wireless communication system to which the present invention can be applied.

2 is a diagram illustrating a resource grid for one downlink slot in a wireless communication system to which the present invention can be applied.

3 illustrates a structure of a downlink subframe in a wireless communication system to which the present invention can be applied.

FIG. 4 illustrates a structure of a UL subframe in a wireless communication system to which the present invention can be applied.

5 is a diagram illustrating an OTDOA method for positioning a terminal.

6 is a diagram showing a pattern in which PRS is assigned to a resource element.

7 is a diagram showing an example of a predictive radio resource management system.

8 is a diagram showing an example of a situation in which it is necessary to track the position of the vehicle.

9 is a diagram illustrating an example of a vehicle position tracking method using the distance between the RSU and the vehicle and the lane of the road.

10 is a diagram showing an example of a method of quantizing lane information proposed in the present specification.

11 is a diagram showing another example of a lane information quantization method proposed by the present specification.

12 is a diagram showing another example of a lane information quantization method proposed in the present specification.

13 is a diagram showing another example of a lane information quantization method proposed by the present specification.

14 is a flowchart showing an example of a location tracking method using the lane information proposed in the present specification.

15 is a flowchart showing an example of a method of operating a vehicle for tracking a position proposed in the present specification.

16 illustrates a block diagram of a wireless communication device to which the methods proposed herein may be applied.

17 illustrates a block diagram of a communication apparatus according to an embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details.

In some instances, well-known structures and devices may be omitted or may be shown in block diagram form, centering on the core functionality of each structure and device, to avoid obscuring the concepts of the present invention.

In this specification, a base station has a meaning as a terminal node of a network that directly communicates with a terminal. The particular operation described herein as performed by the base station may be performed by an upper node of the base station, as the case may be. That is, it is apparent that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station. A 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an evolved NodeB (eNB), a base transceiver system (BTS), an access point (AP) . Also, a 'terminal' may be fixed or mobile and may be a mobile station (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS) Advanced Mobile Station (WT), Wireless Terminal (WT), Machine-Type Communication (MTC), Machine-to-Machine (M2M), and Device-to-Device (D2D) devices.

Hereinafter, a downlink (DL) means communication from a base station to a terminal, and an uplink (UL) means communication from a terminal to a base station. In the downlink, the transmitter may be part of the base station, and the receiver may be part of the terminal. In the uplink, the transmitter may be part of the terminal and the receiver may be part of the base station.

The specific terminology used in the following description is provided to aid understanding of the present invention, and the use of such specific terminology may be changed into other forms without departing from the technical idea of the present invention.

The following techniques may be used in various wireless communication systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC- (non-orthogonal multiple access), and the like. CDMA can be implemented with radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA can be implemented with wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). OFDMA can be implemented with wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and evolved UTRA (E-UTRA). UTRA is part of the universal mobile telecommunications system (UMTS). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is part of E-UMTS (evolved UMTS) using E-UTRA, adopting OFDMA in downlink and SC-FDMA in uplink. LTE-A (advanced) is the evolution of 3GPP LTE.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802, 3GPP and 3GPP2. That is, the steps or portions of the embodiments of the present invention that are not described in order to clearly illustrate the technical idea of the present invention can be supported by the documents. In addition, all terms disclosed in this document may be described by the standard document.

For clarity of description, 3GPP LTE / LTE-A is mainly described, but the technical features of the present invention are not limited thereto.

A wireless communication system to which the present invention can be applied

1 shows a structure of a radio frame in a wireless communication system to which the present invention can be applied.

3GPP LTE / LTE-A supports a Type 1 radio frame structure applicable to Frequency Division Duplex (FDD) and a Type 2 radio frame structure applicable to TDD (Time Division Duplex).

1 (a) illustrates the structure of a Type 1 radio frame. A radio frame is composed of 10 subframes. One subframe consists of two slots in the time domain. The time taken to transmit one subframe is called a transmission time interval (TTI). For example, one subframe may have a length of 1 ms and the length of one slot may be 0.5 ms.

One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain, and includes a plurality of resource blocks (RBs) in the frequency domain. Since 3GPP LTE uses OFDMA in the downlink, an OFDM symbol is intended to represent one symbol period. The OFDM symbol may be one SC-FDMA symbol or a symbol interval. A resource block is a resource allocation unit and includes a plurality of consecutive subcarriers in one slot.

1 (b) shows a type 2 frame structure (frame structure type 2). The Type 2 radio frame is composed of two half frames. Each half frame includes five subframes, a downlink pilot time slot (DwPTS), a guard period (GP), an uplink pilot time slot (UpPTS) One of the subframes is composed of two slots. The DwPTS is used for initial cell search, synchronization, or channel estimation in the UE. UpPTS is used to synchronize the channel estimation at the base station and the uplink transmission synchronization of the UE. The guard interval is a period for eliminating the interference occurring in the uplink due to the multi-path delay of the downlink signal between the uplink and the downlink.

In the Type 2 frame structure of the TDD system, the uplink-downlink configuration is a rule indicating whether the uplink and the downlink are allocated (or reserved) for all the subframes. Table 1 shows an uplink-downlink configuration.

Referring to Table 1, 'D' denotes a subframe for downlink transmission, 'U' denotes a subframe for uplink transmission, 'S' denotes a DwPTS, GP, UpPTS Represents a special subframe consisting of three fields. The uplink-downlink structure can be classified into seven types, and the positions and / or the numbers of the downlink subframe, the special subframe, and the uplink subframe are different for each structure.

The point of time when the downlink is changed to the uplink or the time when the uplink is switched to the downlink is referred to as a switching point. Switch-point periodicity refers to a period in which the uplink subframe and the downlink subframe are switched in the same manner, and both 5ms or 10ms are supported. The special sub-frame S exists for each half-frame when a 5-ms downlink-uplink switching point has a period, and exists only in the first half-frame when a 5-ms downlink-uplink switching point has a period.

In all configurations, the 0th and 5th subframes and the DwPTS are only for downlink transmission. UpPTS and subframes immediately following a subframe subframe are always intervals for uplink transmission.

The uplink-downlink configuration is system information, and both the base station and the terminal can know it. The base station can inform the terminal of the change of the uplink-downlink allocation state of the radio frame by transmitting only the index of the configuration information every time the uplink-downlink configuration information is changed. In addition, the configuration information may be transmitted as a kind of downlink control information through a physical downlink control channel (PDCCH) like other scheduling information, and may be transmitted to all terminals in a cell through a broadcast channel as broadcast information .

The structure of the radio frame is merely an example, and the number of subcarriers included in a radio frame, the number of slots included in a subframe, and the number of OFDM symbols included in a slot can be variously changed.

2 is a diagram illustrating a resource grid for one downlink slot in a wireless communication system to which the present invention can be applied.

Referring to FIG. 2, one downlink slot includes a plurality of OFDM symbols in a time domain. Herein, one downlink slot includes 7 OFDM symbols, and one resource block includes 12 subcarriers in the frequency domain. However, the present invention is not limited thereto.

Each element on the resource grid is a resource element, and one resource block (RB) contains 12 × 7 resource elements. The number of resource blocks NDL included in the downlink slot is dependent on the downlink transmission bandwidth.

The structure of the uplink slot may be the same as the structure of the downlink slot.

3 illustrates a structure of a downlink subframe in a wireless communication system to which the present invention can be applied.

3, a maximum of three OFDM symbols preceding a first slot in a subframe is a control region in which control channels are allocated, and the rest of the OFDM symbols are allocated to a data region (PDSCH) to which a Physical Downlink Shared Channel data region). Examples of the downlink control channel used in 3GPP LTE include a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), and a Physical Hybrid-ARQ Indicator Channel (PHICH).

The PCFICH is carried in the first OFDM symbol of the subframe and carries information about the number of OFDM symbols (i.e., the size of the control region) used for transmission of control channels in the subframe. The PHICH is a response channel for the uplink and carries an ACK (Acknowledgment) / NACK (Not-Acknowledgment) signal for HARQ (Hybrid Automatic Repeat Request). The control information transmitted through the PDCCH is referred to as downlink control information (DCI). The downlink control information includes uplink resource allocation information, downlink resource allocation information, or an uplink transmission (Tx) power control command for an arbitrary terminal group.

PDCCH includes resource allocation and transmission format (also referred to as downlink grant) of DL-SCH (Downlink Shared Channel), resource allocation information of UL-SCH (also referred to as uplink grant), PCH Resource allocation for an upper-layer control message such as paging information in a paging channel, system information in a DL-SCH, and a random access response transmitted on a PDSCH, A set of transmission power control commands for individual terminals in the group, and activation of VoIP (Voice over IP). The plurality of PDCCHs can be transmitted in the control domain, and the UE can monitor a plurality of PDCCHs. The PDCCH consists of a set of one or a plurality of consecutive control channel elements (CCEs). The CCE is a logical allocation unit used to provide a coding rate according to the state of the radio channel to the PDCCH. The CCE corresponds to a plurality of resource element groups. The format of the PDCCH and the number of bits of the available PDCCH are determined according to the association between the number of CCEs and the coding rate provided by the CCEs.

The base station determines the PDCCH format according to the DCI to be transmitted to the UE, and attaches a CRC (Cyclic Redundancy Check) to the control information. The CRC is masked with a unique identifier (called a Radio Network Temporary Identifier (RNTI)) according to the owner or use of the PDCCH. If the PDCCH is for a particular UE, the unique identifier of the UE, e.g., C-RNTI (Cell-RNTI), may be masked in the CRC. Or a PDCCH for a paging message, a paging indication identifier, e.g., a Paging-RNTI (P-RNTI), may be masked to the CRC. System information identifier, SI-RNTI (system information RNTI) can be masked in the CRC if it is a PDCCH for system information, more specifically a system information block (SIB). A random access-RNTI (RA-RNTI) may be masked in the CRC to indicate a random access response that is a response to the transmission of the UE's random access preamble.

FIG. 4 illustrates a structure of a UL subframe in a wireless communication system to which the present invention can be applied.

Referring to FIG. 4, the uplink subframe can be divided into a control region and a data region in the frequency domain. A PUCCH (Physical Uplink Control Channel) that carries the uplink control information is allocated to the control region. A data area is assigned a physical uplink shared channel (PUSCH) for carrying user data. To maintain a single carrier characteristic, one UE does not transmit PUCCH and PUSCH at the same time.

A resource block (RB) pair is allocated to a PUCCH for one UE in a subframe. RBs belonging to the RB pair occupy different subcarriers in each of the two slots. It is assumed that the RB pair assigned to the PUCCH is frequency hopped at the slot boundary.

Observed Time Difference Of Arrival (OTDOA) Method

Hereinafter, the OTDOA method will be described in more detail.

5 is a diagram illustrating an OTDOA method for positioning a terminal.

Referring to FIG. 5, since a UE performs a reference clock based on a subframe transmitted in a current serving cell, signals received from neighboring cells are transmitted to different TOAs (Time Of Arrival).

The serving cell and the neighboring cell may be represented as a serving base station or a neighboring base station, respectively.

That is, the OTDOA method measures a position of a UE using timing differences when signals transmitted from each cell arrive at the UE. Since the reference cell is a cell that is a reference of TDOA, And a delay time of a signal received from each of the plurality of neighboring cells and measures the delay time of a signal received from a serving cell or an anchor cell cell, and the serving cell measures the position of the UE using the reported delay times.

Herein, the reference cell refers to a cell that can be used as a criterion of Time Difference Of Arrival (TDOA). When a serving cell corresponds to this or a terminal performs an operation such as a handover, Or the handover operation of the terminal, or the like.

A common reference signal (CRS) or a primary synchronization signal (PSS / SSS) may be used as a measurement signal for positioning a terminal. However, dedicated positioning for an LCS (LoCation Service) A reference signal (PRS) may be used.

The positioning reference (or reference) signal may be represented by a positioning reference signal, a positioning pilot signal, or the like.

Hereinafter, for convenience of explanation, PRS will be described as an example of a measurement signal used for positioning a terminal.

A positioning reference signal (PRS)

Next, a positioning reference signal (hereinafter referred to as " PRS ") will be described.

PRS is a reference signal used for positioning a UE, and is transmitted only through resource blocks of a downlink subframe determined for PRS transmission.

The PRS sequence is defined by Equation (1).

here,

Indicates a PRS sequence,

Denotes a slot number in a frame, and l denotes an OFDM symbol number in a slot. c (i) represents a pseudo-random sequence, and the pseudo-random sequence generator generates a pseudo-random sequence at the starting point of each OFDM symbol,

.

here,

Is a physical layer cell ID,

Is 1 when the OFDM symbol has a cyclic prefix (CP), and 0 when the OFDM symbol has an extended CP.

PRS sequence (

Lt; RTI ID = 0.0 >("

), Complex-valued modulation symbols (p = 6), which are used as reference signals for antenna port 6 (p = 6)

) According to Equation (3) below.

Here, the resource index pair (k, l) and m, m 'values for the reference signal transmission can be determined according to Equation (4) or (5) below. Equation (4) represents the case of the general cyclic prefix, and Equation (5) represents the case of the extended cyclic prefix.

Here, the bandwidth of the reference signal and the number of resource blocks (

) Is set by the upper layer. In addition, the reference signal has a different frequency shift for each cell

), And such a cell-specific frequency shift is determined according to Equation (6) below.

When a preamble signal is mapped to a radio resource in this manner, the structure of a preamble transmitted in a specific subframe is the same as that of FIG. 6 described later.

6 is a diagram showing a pattern in which PRS is assigned to a resource element. 6 (a) shows a case of a general CP, and Fig. 6 (b) shows a case of an extended CP.

A positioning reference signal (PRS) has a transmission opportunity, i.e., a positioning occasion, at a period of 160, 320, 640, or 1280 ms, and may be transmitted during consecutive N DL subframes in a positioning occasion.

Here, N may have a value of 1, 2, 4, or 6. The PRS may be substantially transmitted in a positioning occasion, but may be muting for intercell interference control cooperation.

Information about this PRS muting is reported to the UE by prs-MutingInfo.

The transmission bandwidth of the PRS can be set independently of the system band of the serving base station and is transmitted in the frequency bands of 6, 15, 25, 50, 75, or 100 resource blocks (RB).

The PRS transmission sequence is generated by initializing a pseudo-random sequence generator for each OFDM symbol as a function of slot index, OFDM symbol index, cyclic prefix (CP) type, and physical cell ID. The generated sequences are mapped to a resource element (RE) according to whether the normal CP or the extended CP is as shown in FIG.

The location of the mapped RE can be shifted on the frequency axis, the shift value being determined by the physical cell ID. The position of the PRS transmission RE in FIG. 6 is the case where the frequency shift is zero.

2. Description of the Related Art Generally, various methods for acquiring location information of a terminal in a cellular communication system are used.

Positioning techniques such as Observed Time Difference of Arrival (OTDOA) and other Assisted Global Navigation Satellite System (A-GNSS) positioning techniques, Enhanced Cell-ID (E-CID) techniques, and Uplink Time Difference of Arrival ), And can be utilized for various location-based services by such a positioning method.

Of these various location tracking methods, there are E-CID, OTDOA, and UTDOA as methods using only network signals.

The E-CID has a limited positioning error and can not bring the correct position.

Also, OTDOA and UTDOA provide much better tracking performance than E-CID, but they have a disadvantage of requiring at least three base stations.

7 is a diagram showing an example of a predictive radio resource management system.

As shown in FIG. 7, it is necessary to grasp the locations of the entire vehicles at the network end for efficient radio resource management (RRM) and scheduling of moving vehicles.

8 is a diagram showing an example of a situation in which it is necessary to track the position of the vehicle.

As shown in FIG. 8, when an automobile (Car A) and a car (Car B) are not visible to each other due to an obstacle such as a building, it is difficult to recognize another vehicle through sensors attached to the vehicle.

Therefore, it is necessary for the network end (for example, the base station) to grasp the position of the vehicle as a whole and inform the vehicle A and the vehicle B of the danger around the vehicle.

The vehicle can recognize the current line of vehicles through a vision sensor (e.g., camera) installed in the vehicle.

The vehicle communicates with the infra such as a roadside unit (RSU) installed at a fixed position on the road, and carries out various ranging methods (for example, time of flight) using the distance between the vehicle and the RSU .

As shown in FIG. 9, through the above-mentioned two pieces of information (the distance between the lane of the road and the vehicle and the RSU), the radius is the distance between the RSU and the vehicle centered on the lane of vehicle and the RSU. The position of the vehicle can be known.

For convenience of explanation, the position tracking method as shown in FIG. 9 is referred to as V-I position tracking.

9 is a diagram illustrating an example of a vehicle position tracking method using the distance between the RSU and the vehicle and the lane of the road.

Therefore, the present invention proposes a method of tracking the position of a vehicle by utilizing the vision sensors of the vehicle based on the above-mentioned contents.

Specifically, a method for tracking the position of a vehicle through lane information obtained through vision sensors provided in the vehicle and a distance between the RSU and the vehicle will be described.

First, the vehicle can signal to the RSU or the location server whether vision sensors capable of recognizing the lane are mounted or not.

The RSU or location server determines how to locate the vehicle (e.g., OTDOA, VI location tracking) to know whether it is possible to obtain information about the lane (e.g., number of lanes) the vehicle is driving through vision sensors .

For this purpose, the vehicle can report to the network through the physical layer signal or the upper layer signal whether the vehicle has the ability to collect information about the running lane through its vision sensors.

The information reported to the network in this way may initially be included in the capability signaling that the vehicle transmits to the network in connection with location tracking.

When the RSU receives from the vehicle whether it is capable of collecting information about the lane through the vision sensors and transmits it to the location server, it checks the ID of the vehicle so that the location server can identify which vehicle is capable of collecting information about the lane Together.

Accordingly, the location server can determine the position of the vehicle by applying a certain position tracking method to any vehicle.

Next, the network signals information to the corresponding vehicle, which is useful for recognizing the lane of the vehicle.

It is possible to determine which road (or lane) the currently running road (or lane) is based on, for example, information about the RSUs communicating with the vehicle while the vehicle is running and information on the previous position of the vehicle.

Therefore, the network can know which road the vehicle is on, so it is possible to use the location server or the RSU to display all or part of the information (e.g., the number of total lanes, the number of one-way lanes, etc.) To the vehicle as a physical layer signal or an upper layer signal.

This information can reduce the error in which the vehicle uses vision sensors to determine how many lanes it is running.

That is, the vehicle can know accurate information about the currently running lane using the lane information acquired by the vehicle and the lane information acquired through the network (or the location server or the RSU).

Information that helps the lane recognition of the vehicle, such as information about the road on which the vehicle is running, may be provided only to the vehicle requesting such information (dedicated signaling or unicast method) to obtain a more accurate lane, It may be signaled to all vehicles (broadcast mode).

Alternatively, the information useful for lane recognition of the vehicle may be information provided to all the vehicles connected to the RSU.

Next, a method of quantizing lane information will be described.

The vehicle can quantize the information about the recognized lane through the vision sensors to the RSU or the location server.

Assume that the quantization level is Q when quantizing information on the lane (or lane information).

Here, the methods of quantizing the information on the lane may vary depending on the number L of lanes and the quantization level Q. [

here,

Means the ceiling of x. E.g,

All.

However, it is practically impossible to quantize and transmit the values corresponding to each lane.

Accordingly, a certain lane that divides the road by 2 ^ Q equals to the lane that is closest to the lane in which the actual vehicle travels among the above lanes.

For example, let us assume a five-lane road with Q = 2 and five lanes (L = 5) as shown in Fig.

In this case, an arbitrary lane (blue solid line 1020) in which the road is divided by 2 ^ 2 = 4 equals is generated, and information about the lane closest to the current lane (red solid line 1030) '01' to the RSU or the location server.

In this case, the RSU or the location server tracks the location of the vehicle using the blue line corresponding to '01'.

10 is a diagram showing an example of a method of quantizing lane information proposed in the present specification.

10,

Represents an example of quantization for lane information.

Next, Q =

The quantization method for lane information will be described with reference to FIG.

11 is a diagram showing another example of a lane information quantization method proposed by the present specification.

In this case, the vehicle quantizes the value corresponding to each lane as it is and transmits it to the RSU or the location server.

For example, let us assume a four-lane road with Q = 2 and four lanes as shown in Fig.

In this case, 00, 01, 10, and 11 represent one lane, two lanes, three lanes, and four lanes, respectively. send.

In this case, the network node tracks the position of the vehicle using the blue line 1120 corresponding to '01'.

Next,

The quantization method for the lane information will be described with reference to FIG.

12 is a diagram showing another example of a lane information quantization method proposed in the present specification.

First, Q =

+1 means

Among the +1 bits,

The bits are quantized and transmitted as they are for each lane, and the remaining 1 bit tells the extent to which the lane on which the vehicle is running is at the center of the lane.

For example, let us assume the case of FIG. 12 where Q = 3 and the number of lanes is 3 (L = 3).

In this case,

The bits are '00', '01' and '10', respectively, and the lane information of the vehicle can be represented by '01'.

In addition, since the remaining one bit indicates whether or not the vehicle is located at a certain distance or more from the center of the lane on the basis of the currently running lane, the vehicle has a certain distance from the current center, .

Therefore, the vehicle transmits '011', which is information on the lane, to the network.

Since the network receives 011, but there are two zones (or positions) corresponding to the 011 value, in order to reduce the error when calculating the position of the vehicle, among the three bits, '01' The corresponding blue line 1220 is used.

The network can detect the degree of error of the vehicle position and the safety hazards of the vehicle (eg lane departure) by using the V-I location tracking technique through the additional information bit.

Next,

1, lane information quantization will be described with reference to FIG.

13 is a diagram showing another example of a lane information quantization method proposed by the present specification.

First,

Let's look at the meaning of +1.

Among Q bits

+1 bits have the same meaning as mentioned in FIG.

That is,

The bits are used to quantize and transmit the values corresponding to each lane,

The +1 th bit indicates the degree to which the vehicle has fallen to the center of the lane based on which lane the vehicle is running.

The remaining Q-

-1 bits

The area represented by +1 bits is 2 ^ (Q-

-1) indicates that there is a vehicle in the area.

Suppose, for example, the case of FIG. 13 where Q = 4 and the number of lanes is 3 (L = 3).

In this case,

The bits are '00', '01' and '10', respectively, indicating one lane, two lanes and three lanes.

Therefore, the lane information for the vehicle in Fig. 13 can be represented by " 01 ".

The next 1 bit tells you whether it is a certain distance or more from the center of the lane based on the current lane.

In Fig. 13, the vehicle is at a certain distance from the center of the secondary lane, so this value is one.

Finally, the remaining 1 bit is divided by 2 ^ (1) into the area indicated by 011x, and the value corresponding to the area where the vehicle is located is selected.

Therefore, as shown in FIG. 13, finally, the vehicle transmits '0110', which is information on the lane, to the network.

When the network receives '0110' from the vehicle, it tracks the position of the vehicle using the center line (blue line, 1320) of the area.

But,

If the (+1) th bit is '0', rather than tracking the position of the vehicle using the center line of the area of 0100 or 0101

It may be more accurate to track the position to the centerline of the two lanes, which is the centerline of '01' represented by bits.

The reason is that the vehicles that run are usually likely to run in the middle of the lane.

Likewise, information about the quantization can be conveyed via physical layer (control) signals or RRC signaling or higher layer signals.

Next, a framework for lane information transmission will be described.

First, the lane information may be transmitted periodically, that is, periodically.

The RSU or the location server can configure the resources to periodically transmit the lane information to the vehicle.

The configuration information may include a time / frequency resource period, a location, and the like for transmitting the lane information.

In another example, the lane information may be transmitted in an aperiodic information transmission mode, i.e., aperiodically.

For example, when the vehicle changes lanes, the RSU or the location server can support the vehicle to transmit information of the lane two aperiodically in order to raise the information of the changed lane.

When the lane of the vehicle changes and the lane information needs to be transmitted aperiodically, the vehicle requests a resource configuration for raising the changed lane information to the RSU or the location server.

The RSU, which is requested to transmit resources related to the transmission of aperiodic lane information from the vehicle, transmits information (e.g., location) about a resource through which the vehicle will transmit lane information through DCI (Downlink Control Information).

Then, the vehicle transmits the information of the lane to the configured resource (aperiodic).

The vehicle may reserve (or be preset) resources for aperiodically transmitting lane information in advance, without having to request allocation of resources related to aperiodic lane information in order to aperiodically transmit lane information.

The resource reports the network as a physical layer or an upper layer signal with a predetermined value or a blank value at a normal time, and can report the information of the lane through a corresponding resource when it is necessary to transmit information of a lane two aperiodically.

The previous information can be transmitted in RRC or higher layer signals.

Next, when the vehicle requests lane information from the network, the operation of the network and the vehicle will be described, respectively.

Here, the network may be an RSU or a location server.

First, the location server can know information as to whether a vehicle has the ability to grasp a running lane using a vision sensor (s) through UE capability signaling or the like in advance.

Therefore, the location server can request the vehicles having the ability to grasp the lane to transmit information about the lane.

When the vehicle which is requested by the location server for the lane information can not grasp the lane due to the weather environment or the problem of the vision sensors, the vehicle can be classified into a physical layer or an upper layer Layer signal.

Since the vehicle that makes this report is a vehicle that can not track the V-I position, it can be traced in other ways.

Alternatively, the location server may request lane information for vehicles that do not know whether they have the ability to grasp lane information using vision sensors.

If it is possible for the vehicle which has received the request for the lane information to grasp the lane information through the vision sensors, the vehicle can report the lane information to the network in the physical layer or the upper layer signal.

However, if it is not possible for the vehicle to receive the lane information through the vision sensors, it should report the traffic to the network as a physical layer or an upper layer signal with a predetermined value or an empty value in a predetermined field .

14 is a flowchart showing an example of a location tracking method using the lane information proposed in the present specification.

14, the location server requests the vehicle to indicate whether it is capable of collecting information about a lane running through a vision sensor (s) (S1410 ).

In step S1410, a capability request message may be used.

The vehicle receiving the request from the location server transmits information on whether the vehicle is capable of recognizing the lane running to the location server (S1420).

In step S1420, a capability response message may be used.

The location server may transmit information (e.g., assistance data, etc.) about the road information of the vehicle currently running to the vehicle, a method of quantizing lane information, a framework for transmitting lane information, and the like (S1430).

The location server transmits a location information request to the RSU or the vehicle to track the location (S1440).

Then, the RSU measures the distance between the RSU and the vehicle (S1450), and the vehicle recognizes information about the currently running lane (S1460).

The RSU and the vehicle respectively transmit information about the distance between the RSU and the vehicle and the lane by the location server (S1470).

Then, the location server determines the location of the vehicle using the information received in step S1470.

15 is a flowchart showing an example of a method of operating a vehicle for tracking a position proposed in the present specification.

First, the vehicle receives a capability request message from the network requesting that it is capable of collecting information on a line of vehicle (S1510).

The network may be represented by a location server, a base station, a road side unit (RSU), or a network end.

Here, the ability to collect information about the lane may be determined by the presence or absence of the sensor.

Then, the vehicle transmits a capability response message indicating the response to the capability request message to the network (S1520).

The capability response message may include a vehicle identifier (ID) that identifies the vehicle.

Then, the vehicle obtains lane information indicating which lane the currently running lane is using by using a sensor for recognizing the lane (S1530).

Here, the sensor may be a vision sensor, a camera, or the like.

Here, the lane information may be quantized based on a value related to the number of lanes and a quantization level.

The first part of the quantization level may be a value indicating a lane on which the vehicle is running and the second part may be a value indicating a distance between the center of the lane on which the vehicle is running and the vehicle.

A detailed description of the first part and the second part will be given with reference to FIGS. 10 to 13. FIG.

The values associated with the number of lanes

Lt; / RTI >

Then, the vehicle transmits the obtained lane information to the network (S1540).

Additionally, the vehicle may further comprise receiving from the network control information associated with the road currently being run.

Here, the control information may include at least one of information indicating the total number of lanes on the road or information indicating the number of one-way lanes.

Apparatus to which the present invention may be applied

16 and 17, the base station and the terminal may be represented by wireless devices, respectively.

The base station may be represented by a network, an RSU or a location server, a network unit, and the terminal may be represented by an automobile, a vehicle, or the like.

16 illustrates a block diagram of a wireless communication device to which the methods proposed herein may be applied.

Referring to FIG. 16, a wireless communication system includes a base station 1610 and a plurality of terminals 1620 located in a base station area.

The base station 1610 includes a processor 1611, a memory 1612, and a radio frequency module 1613. The processor 1611 implements the functions, processes, and / or methods suggested earlier in FIGS. 1-15. The layers of the air interface protocol may be implemented by a processor. The memory 1612 is coupled to the processor and stores various information for driving the processor. The RF module 1613 is coupled to the processor to transmit and / or receive wireless signals.

The terminal includes a processor 1621, a memory 1622, and an RF module 1623.

The processor implements the functions, processes and / or methods suggested in FIGS. 1-15. The layers of the air interface protocol may be implemented by a processor. The memory is coupled to the processor and stores various information for driving the processor. The RF module 1623 is coupled to the processor to transmit and / or receive wireless signals.

The memories 1612 and 1622 may be internal or external to the processors 1611 and 1621 and may be coupled to the processor by various well known means.

Also, the base station and / or the terminal may have a single antenna or multiple antennas.

17 illustrates a block diagram of a communication apparatus according to an embodiment of the present invention.

In particular, FIG. 17 is a diagram illustrating the terminal of FIG. 16 in more detail.

17, a terminal includes a processor (or a digital signal processor (DSP) 1710, an RF module (or RF unit) 1735, a power management module 1705 An antenna 1740, a battery 1755, a display 1715, a keypad 1720, a memory 1730, a SIM (Subscriber Identification Module ) card 1725 (this configuration is optional), a speaker 1745 and a microphone 1750. The terminal may also include a single antenna or multiple antennas .

The terminal may include a sensor capable of recognizing a lane.

Processor 1710 implements the functions, processes, and / or methods suggested earlier in FIGS. 1-15. The layer of the air interface protocol may be implemented by a processor.

Memory 1730 is coupled to the processor and stores information related to the operation of the processor. The memory 1730 may be internal or external to the processor and may be coupled to the processor by various well known means.

The user inputs command information such as a telephone number or the like by, for example, pressing (or touching) a button on the keypad 1720 or by voice activation using a microphone 1750. [ The processor receives such command information and processes it to perform appropriate functions, such as dialing a telephone number. Operational data may be extracted from sim card 1725 or memory 1730. In addition, the processor may display command information or drive information on the display 1715 for the user to recognize and also for convenience.

RF module 1735 is coupled to the processor to transmit and / or receive RF signals. The processor communicates command information to the RF module to transmit, for example, a radio signal that constitutes voice communication data, to initiate communication. The RF module consists of a receiver and a transmitter for receiving and transmitting radio signals. The antenna 1740 functions to transmit and receive a radio signal. When receiving a radio signal, the RF module can transmit the signal for processing by the processor and convert the signal to baseband. The processed signal may be converted to audible or readable information output via speaker 1745. [

The embodiments described above are those in which the elements and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

Embodiments in accordance with the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) field programmable gate arrays, processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, a procedure, a function, or the like for performing the functions or operations described above. The software code can be stored in memory and driven by the processor. The memory is located inside or outside the processor and can exchange data with the processor by various means already known.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the essential characteristics thereof. Accordingly, the foregoing detailed description is to be considered in all respects illustrative and not restrictive. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Although the method for tracking the location in the wireless communication system of the present invention has been described with reference to the example applied to the 3GPP LTE / LTE-A system, it can be applied to various wireless communication systems other than the 3GPP LTE / LTE-A system.

Claims (10)

1. A method for tracking a location of a vehicle in a wireless communication system, the method being performed by the vehicle,

   Receiving a capability request message from a network requesting that the capability of collecting information about a line of a vehicle is available;

   Sending a capability response message to the network indicating a response to the capability request message;

   Obtaining lane information indicating which lane the currently running lane is by using a sensor recognizing the lane; And

   And transmitting the obtained lane information to the network.
2. The method according to claim 1,

   Wherein the lane information is quantized based on a value associated with the number of lanes (L) and a quantization level (Q).
3. 3. The method of claim 2,

   Wherein the first part of the quantization level is a value indicating a lane on which the vehicle is running and the second part is a value indicating a distance between the center of the lane on which the vehicle is running and the vehicle .
4. 3. The method of claim 2,

   The values associated with the number of lanes

   

   ≪ / RTI >
5. The method according to claim 1,

   Further comprising receiving from the network control information associated with the road currently being run.
6. 6. The method of claim 5,

   Wherein the control information includes at least one of information indicating the total number of lanes of the road or information indicating the number of one-way lanes.
7. The method according to claim 1,

   RTI ID = 0.0 > 1, < / RTI > wherein the capability response message comprises a vehicle identifier (ID) that identifies the vehicle.
8. The method according to claim 1,

   Characterized in that the sensor is a vision sensor.
9. The method according to claim 1,

   Wherein the ability to collect information about the lane is determined by the presence or absence of the sensor.
10. A vehicle for tracking a location in a wireless communication system,

    A sensor for recognizing a lane;

    An RF (Radio Frequency) module for transmitting and receiving a radio signal; And

    A processor operatively connected to the RF module and the sensor for controlling the vehicle,

    Control the RF module to receive a capability request message from the network requesting that it is capable of collecting information about a line of vehicle;

    Control the RF module to send a capability response message to the network indicating a response to the capability request message;

    Control the sensor to obtain lane information indicating which lane the currently running lane is; And

    And controls the RF module to transmit the obtained lane information to the network.

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