KR20220139132A - Apparatus, mobile and method for providing network service - Google Patents

Abstract

A communication service providing device comprises: a receiving unit for receiving communication data including a plurality of slots from a mobile object; a movement speed estimating unit for estimating a first movement speed of the mobile object by comparing at least two symbols among a plurality of symbols included in the plurality of slots and estimating a second movement speed of the mobile object by comparing at least two slots among the plurality of slots; and a compensation unit for compensating for a phase shift of the plurality of symbols based on the first movement speed and the second movement speed.

Description

Apparatus, mobile body and method for providing communication service {APPARATUS, MOBILE AND METHOD FOR PROVIDING NETWORK SERVICE}

The present invention relates to an apparatus, a mobile body and a method for providing a communication service.

As mobile communication technology develops from the 4th generation to the 5th generation, the complexity is increasing as various types of networks are converged. In addition, with the flow of the mobile communication market that requires high-speed data, the coverage of the base station is gradually decreasing.

Since more base stations are needed to provide better quality communication service, network operators pay a lot of money to install and maintain multiple base stations.

Meanwhile, in the case of 3GPP LTE, automation functions such as self-configuration and self-optimization are not easy to find because it is not easy to find optimal communication conditions suitable for the changing wireless environment in the situation of interworking of various types of base stations. SON (Self organizing networking) technology including

In particular, with the development of communication technology, the demand for communication speed continues to increase according to the increase in the speed of high speed such as high-speed rail. In this demand, wireless communication technology is evolving from LTE to NR, and efforts are being made to solve Doppler shift for high speed.

In the current NR standard, the Doppler shift problem for high speed is to be solved at the receiving end. Specifically, the Doppler shift problem is overcome by placing a demodulation reference signal (DMRS) in each channel so that the receiver estimates the channel by looking at the pilot signal.

Referring to FIG. 1A , in the LTE standard, the Doppler shift is overcome and the channel is estimated using a cell-specific RS (CRS), which is a downlink reference signal. However, the use of CRS is quite inefficient because it limits the flexibility of network configuration. In addition, the use of CRS is difficult to apply to a high frequency region of 6 GHz or higher, and is not suitable for a MIMO system using a plurality of antennas.

Therefore, in order to compensate for these shortcomings, in the 5G standard, new reference signals (RSs) such as Tracking RS (TRS), Demodulation RS (DMRS), Channel Status Information RS (CSI-RS), and Phase Tracking RS (PTRS) are introduced in the 5G standard. It will respond to different frequency bands and various scenarios.

Referring to FIG. 1B, when a basic downlink resource (DL Resource) in the existing 5G is expressed in a grid format, the PDCCH channel is blue, the PDCCH MARS channel is black, and the PDSCH channel is yellow. The PDSCH DMRS channel can be represented by being distinguished by a red color.

Here, the role of the PDCCH channel serves as a header, and provides various types of information so that the terminal (mobile) can well receive the actual data included in the PDSCH channel. The PDSCH channel includes actual data of downlink transmitted from an actual base station. The PDCCH DMRS channel is a signal that provides a modulation reference for estimating the channel in order to receive the PDCCH channel well. The PDSCH DMRS channel is a modulation reference signal used for channel estimation to receive downlink actual data.

The existing PDSCH DMRS may be designated from 1 symbol to 4 symbols according to the configuration of the base station. For example, since the degree of phase rotation according to the Doppler shift changes as the moving speed of the vehicle increases, the number of symbols may be adjusted to better overcome the phase rotation of the channel.

However, in the case of the existing PDCCH, although it is possible to estimate the magnitude well, there is a limitation in channel estimation because only one symbol (a symbol located at the front among a plurality of symbols included in the slot) is used in one slot. do.

Meanwhile, as a method for solving the Doppler shift for the PDSCH channel, several symbols corresponding to the PDSCH DMRS are used in the slot. That is, in the case of the PDSCH DMRS, it is standardized so that 1 to 4 symbols can be designated according to the configuration of the base station.

1C is an exemplary diagram illustrating the number of symbols used in PDSCH DMRS in the form of 2 symbols, 3 symbols, and 4 symbols on the time axis. By adjusting the number of symbols of the PDSCH DMRS, a frequency offset caused by a Doppler shift of the PDSCH can be resolved.

For example, with reference to FIG. 1D , when the number of symbols of the PDSCH DMRS is applied to 2 symbols in the 3.5 GHz band, an allowable speed that a UE (mobile body) can receive will be described. PDSCH DMRS consists of QPSK of Gold Sequence. As shown in FIG. 1D , if it is outside the first quadrant, the probability of receiving an error increases. Therefore, it is necessary to design so that the range of the phase shift does not deviate by 90 degrees. The speed at which the phase shift occurs is called the angular speed. According to the Doppler formula (Equation 1), as the Doppler shift increases, the angular velocity also increases.

[Equation 1]

That is, according to the Doppler formula, as the moving speed of the vehicle increases, the frequency provided by the equipment increases, or the wavelength decreases, the Doppler shift increases and the angular velocity increases accordingly.

Therefore, the allowable speed for preventing the PDSCH DMRS interval from deviating from the 90 degree angular velocity in the 3.5 GHz band can be calculated inversely.

For example, it is assumed that the interval between two symbols of PDSCH DMRS is 7 symbols (14 symbols/2), and the phase shift during the interval (0.25us) between these two symbols is up to 90 degrees (+-45 degrees), which is the allowable range of QPSK. Calculating the allowable speed that can be equal to 0.25us is 90 degrees, so 360 degrees equals 1ms, giving fd = 1/0.001 = 1000Hz. When this is applied to the Doppler formula (Equation 1), a speed of about 300 km/h is derived through [Equation 2].

[Equation 2]

In conclusion, it is possible to receive up to a speed of about 300 km/h with two symbols of PDSCH DMRS in the 3.5 GHz band.

Next, in a situation with two PDSCH DMRS symbols, how a UE (mobile) can well receive the PDSCH will be described with reference to FIG. 1E.

Figure 1e is an example of a phase shift for each speed, if the PDSCH DMRS is transmitted in the 2nd symbol and the 9th symbol on the assumption that the terminal (mobile body) is moving at a constant speed, the Data (PDSCH) symbol has a difference of about 13 degrees fly At this time, since the terminal can predict such a difference, it is possible to receive correctly when receiving with a phase shift of -13 degrees at the time of reception. This method is a method using the linear interpolation method shown in Fig. 1f.

The PDCCH also can overcome the Doppler shift solution in the high-speed section with the PDCCH DMRS.

For example, if the allowable speed between two PDSCH DMRS symbols in the 3.5 GHz band is 300 km/h, the phase shift due to the Doppler shift is 360 degrees for 1 ms, so if the PDCCH DMRS period is 0.5 ms, 180 degrees goes. In this case, since it is impossible for the UE to predict the angle between the two PDSCH DMRS symbols, there is a high probability of decoding failure.

1H is a flowchart illustrating a conventional method of compensating for a phase shift due to a Doppler shift. 1H, in step S101, the base station (or mobile) calculates the slot-unit phase shift through the PDSCH DMRS in the PDCCH symbol of the first slot of downlink data including a plurality of slots consisting of one PDCCH symbol per slot. can In step S103, the base station (or mobile) calculates the phase shift in units of slots in the PDCCH symbol of the second slot, and then repeats the processes of steps S101 and S103 until N times corresponding to the number of slots. . In step S105, the base station (or moving object) may calculate the moving speed of the moving object by estimating the phase difference in units of slots, and may compensate the phase difference by linear interpolation in step S107.

Since the conventional phase shift compensation scheme as shown in FIG. 1H compensates for the phase shift in units of slots according to the basic PDCCH period, it is difficult to overcome the phase shift in the high-speed section as described above.

Japanese Patent Publication No. 10-5593062 (Registered on Aug. 8, 2014)

The present invention is intended to solve the problems of the prior art described above, and to apply symbol-based phase shift compensation and slot-based phase shift compensation in a complex manner to communication data received from a high-speed moving object.

However, the technical problems to be achieved by the present embodiment are not limited to the technical problems described above, and other technical problems may exist.

As a technical means for achieving the above technical problem, the communication service providing apparatus according to the first aspect of the present invention is a receiving unit for receiving communication data including a plurality of slots from a mobile body; The first movement speed of the movable object is estimated by comparing at least two symbols among a plurality of symbols included in the plurality of slots, and the second movement speed of the movable object is estimated by comparing at least two slots among the plurality of slots. moving speed estimation unit; and a compensator for compensating for a phase shift of the plurality of symbols based on the first and second moving speeds.

A mobile device according to a second aspect of the present invention includes: a receiving unit for receiving communication data including a plurality of slots from a base station; The first movement speed of the movable object is estimated by comparing at least two symbols among a plurality of symbols included in the plurality of slots, and the second movement speed of the movable object is estimated by comparing at least two slots among the plurality of slots. moving speed estimation unit; and a compensator for compensating for a phase shift of the plurality of symbols based on the first and second moving speeds.

A communication service providing method performed by a communication service providing apparatus according to a third aspect of the present invention comprises the steps of: receiving communication data including a plurality of slots from a mobile body; The first movement speed of the movable object is estimated by comparing at least two symbols among a plurality of symbols included in the plurality of slots, and the second movement speed of the movable object is estimated by comparing at least two slots among the plurality of slots. to do; and compensating for a phase shift with respect to the plurality of symbols based on the first movement speed and the second movement speed.

The above-described problem solving means are merely exemplary, and should not be construed as limiting the present invention. In addition to the exemplary embodiments described above, there may be additional embodiments described in the drawings and detailed description.

According to any one of the above-described means for solving the problems of the present invention, the present invention provides a conventional PDCCH by complexly applying symbol-based phase shift compensation and slot-based phase shift compensation to communication data received from a high-speed moving object. The disadvantage of one slot cycle can be overcome.

Through this, the present invention can overcome the limitations of the conventional PDCCH channel estimation performance and solve the PDCCH decoding failure due to the Doppler phase in the high-speed section.

In addition, the present invention can use a transmission/reception technology optimized for a high-speed section flexibly and universally, and implement an optimized 5G transceiver. In addition, the present invention can overcome the phase shift due to the Doppler shift in the right place by enhancing the compensation of the phase shift to satisfy various speed conditions.

1A to 1H are diagrams for explaining a conventional communication service method.
2 is a block diagram of a communication service providing system according to an embodiment of the present invention.
3 is a block diagram of an apparatus for providing a communication service shown in FIG. 2 according to an embodiment of the present invention.
4 is a diagram illustrating a time diagram for compensating for a phase shift according to an embodiment of the present invention.
5 is a diagram illustrating a phase shift guarantee process according to an embodiment of the present invention.
6 is a block diagram of the movable body shown in FIG. 2 according to an embodiment of the present invention.
7 is a flowchart illustrating a communication service providing method according to an embodiment of the present invention.
8 is a flowchart illustrating a method of calculating the moving speed of the movable body 210 according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is "connected" with another part, this includes not only the case of being "directly connected" but also the case of being "electrically connected" with another element interposed therebetween. . Also, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

In this specification, a "part" includes a unit realized by hardware, a unit realized by software, and a unit realized using both. In addition, one unit may be implemented using two or more hardware, and two or more units may be implemented by one hardware.

Some of the operations or functions described as being performed by the terminal or device in this specification may be instead performed by a server connected to the terminal or device. Similarly, some of the operations or functions described as being performed by the server may also be performed in a terminal or device connected to the corresponding server.

Hereinafter, detailed contents for carrying out the present invention will be described with reference to the accompanying configuration diagram or process flow diagram.

2 is a block diagram of a communication service providing system according to an embodiment of the present invention.

Referring to FIG. 2 , the communication service providing system may include a communication service providing apparatus 200 and a mobile body 210 . However, since the communication service providing system of FIG. 1 is only an embodiment of the present invention, the present invention is not limitedly interpreted through FIG. 1 , and may be configured differently from FIG. 1 according to various embodiments of the present invention. .

The communication service providing apparatus 200 is a base station, and a reference signal value (PDCCH DMRS, Physical Downlink Control Channel Demodulation Reference Signal) for a control channel among a plurality of symbols included in a plurality of slots constituting communication data transmitted and received with the mobile unit 210 . ) to set the number of symbols to be allocated, and a slot period for a plurality of slots can be set.

The communication service providing apparatus 200 may receive communication data including a plurality of slots from the mobile body 210 moving at high speed.

The communication service providing apparatus 200 estimates the first movement speed of the mobile unit 210 by comparing at least two symbols among a plurality of symbols included in a plurality of slots, and compares at least two slots among the plurality of slots to compare the mobile object. The second movement speed of 210 may be estimated.

The communication service providing apparatus 200 may compensate for the phase shift of the plurality of symbols based on the estimated first and second moving speeds of the mobile body 210 .

The mobile body 210 may include a mobile terminal capable of wireless communication, and according to various embodiments of the present disclosure, the mobile body 210 may be various types of devices located in a vehicle moving at a high speed. In addition to this, the example proposed by the present invention may include a case in which the relative speed difference between the communication service providing apparatus 200 and the mobile body 210 is equal to or greater than a preset speed, and in this situation, the communication data receiving side corresponds to the case. We want to propose a method (complementary compensation through slot-based compensation and symbol-based compensation) for compensating for phase shift in a receiving destination.

For example, the mobile unit 210 may be a portable terminal capable of accessing a remote server through a network. Here, an example of a portable terminal is a wireless communication device that guarantees portability and mobility, and includes a Personal Communication System (PCS), a Global System for Mobile communications (GSM), a Personal Digital Cellular (PDC), a Personal Handyphone System (PHS), and a PDA. (Personal Digital Assistant), IMT (International Mobile Telecommunication)-2000, CDMA (Code Division Multiple Access)-2000, W-CDMA (W-Code Division Multiple Access), Wibro (Wireless Broadband Internet) terminal, smartphone All kinds of handheld-based wireless communication devices such as , tablet PC, and the like may be included. However, the movable body 210 is not limited to those exemplified above.

Hereinafter, the operation of each component of the communication service providing system of FIG. 1 will be described in more detail.

3 is a block diagram of the communication service providing apparatus 200 shown in FIG. 2 according to an embodiment of the present invention.

Referring to FIG. 3 , the communication service providing apparatus 200 may include a receiving unit 300 , a moving speed estimating unit 310 , a compensating unit 320 , and a setting unit 330 . However, the communication service providing apparatus 200 illustrated in FIG. 3 is only one implementation example of the present invention, and various modifications are possible based on the components illustrated in FIG. 3 .

The setting unit 330 sets the number of symbols of a symbol to which a reference signal value for a control channel is assigned among a plurality of symbols included in a plurality of slots constituting communication data transmitted and received with the mobile unit 210, and is assigned to the plurality of slots. You can set the slot period for

For example, the setting unit 330 may set the number of symbols to which the reference signal value for the control channel is to be allocated from 1 to N for each of the plurality of slots.

For example, referring to FIG. 4 , the setting unit 330 sets the number of symbols to which the reference signal value for the control channel is to be allocated to three in the case of the first slot (1 ^st Slot) during the first slot period, In the case of the second slot ( ^2nd Slot), the number of symbols to which the reference signal value for the control channel is allocated is set to one, and in the case of the third slot ( ^3rd Slot), the reference signal value for the control channel is allocated The number of symbols can be set to one.

In the case of the first slot (1 ^st Slot), the present invention can be applied by expanding the number of symbols to which a reference signal value for a control channel is to be allocated. When the number of symbols to which the reference signal value for the control channel is allocated is increased, the amount of traffic for transmission of the PDSCH is reduced and there is a risk that the throughput may decrease. There is a possibility that the phase shift estimation performance may be deteriorated. Therefore, in the present invention, it is assumed that the number of symbols to which the reference signal value for the control channel is to be allocated is applied to the first slot up to three.

The setting unit 330 may set the slot period for the plurality of slots so that the throughput of communication data does not decrease in the moving section of the mobile body 210 . For example, as the value (M) of the slot period increases, the usage of the PDSCH increases and thus the PDSCH throughput may increase, but the channel estimation performance due to channel aging may be reduced. Conversely, as the value of the slot period is smaller, the channel estimation performance by channel aging may be improved, but the PDSCH usage may be reduced, and thus the PDSCH throughput may be reduced.

Therefore, the setting unit 330 determines the number of symbols and the slot period of the symbols to which the reference signal value for the control channel is to be allocated through tests and simulations in the commercial network so that the throughput of the PDSCH does not decrease in the movement section of the mobile unit 210 . It is possible to determine the optimal value for

The receiver 300 may receive communication data including a plurality of slots from the mobile body 210 moving at high speed.

The moving speed estimator 310 estimates the first moving speed of the moving object 210 by comparing at least two symbols among a plurality of symbols included in the plurality of slots, and comparing at least two slots among the plurality of slots to compare the moving object. The second movement speed of 210 may be estimated.

Specifically, the moving speed estimator 310 may estimate the first moving speed of the moving object 210 on a symbol-by-symbol basis based on the set number of symbols.

The movement speed estimator 310 estimates and estimates the first phase shift on a symbol-by-symbol basis by comparing the first symbol of the first slot and the second symbol of the first slot included in the plurality of slots according to the set number of symbols. The first moving speed of the movable body 210 may be estimated based on the first phase displacement.

For example, referring to FIG. 4 , when the number of symbols to which a reference signal value for a control channel is assigned among a plurality of symbols included in a first slot (1 ^st Slot) is three, the movement speed estimation unit 310 Estimates the 1-1 phase shift by comparing the first symbol 401 of the first slot and the second symbol 403 of the first slot, and the second symbol 403 of the first slot and the second symbol 403 of the first slot. The first and second phase shifts are estimated by comparing the third symbols 405, and the first moving speed of the moving object 210 moving at high speed based on the estimated 1-1 phase shift and the 1-2 phase shift can be estimated.

(Doppler Frequency)가 1000Hz됨을 역계산하고, 역계산된 값을 통해 이동체(210)가 약 300km/h의 속도(제 1 이동속도)로 이동하고 있다고 추정할 수 있다. Assuming that three symbols to which reference signal values for the control channel are assigned as shown in FIG. 4 are used in the first slot, and the phase of the moving object 210 is shifted by 13 degrees per symbol, the movement speed estimation unit 310 may estimate the first moving speed of the mobile body 210 according to the Doppler shift formula (Equation 1). That is, the moving speed estimator 310 generates a phase shift difference of 360 degrees in 1 ms using the Doppler shift formula (Equation 1),

It can be inversely calculated that the (Doppler Frequency) is 1000 Hz, and it can be estimated that the mobile body 210 is moving at a speed of about 300 km/h (the first moving speed) through the inversely calculated value.

However, if the moving speed of the moving object 210 is estimated by applying only the method of the existing slot period (eg, 0.5 ms), the phase shift for the high-speed section is beyond the phase shift (+-90 degrees) that can already be estimated. It is difficult to estimate.

The moving speed estimator 310 may estimate the second moving speed of the moving object 210 moving at high speed on a slot-by-slot basis based on the set slot period.

The movement speed estimator 310 compares the first symbol of the second slot included in the plurality of slots and the first symbol of the third slot included in the plurality of slots according to the set slot period to obtain a second phase on a per-slot basis. The displacement may be estimated, and the second moving speed of the moving object 210 may be estimated based on the estimated second phase shift.

For example, referring to FIG. 4 , the movement speed estimator 310 includes a first symbol 407 and a third slot 3 of a second slot (2 ^nd Slot) included in a plurality of slots during a first slot period. ^rd Slot) to estimate the 2-1 th phase shift on a slot-by-slot basis, and estimate the second movement speed of the mobile 210 based on the estimated 2-1 th phase shift. can Next, the movement speed estimator 310 compares the first symbol 409 of the third slot (3 ^rd Slot) and the first symbol of the fourth slot (4 ^th Slot) to obtain the second-second phase on a per-slot basis. The displacement may be estimated, and the second moving speed of the mobile body 210 may be estimated based on the estimated 2-2 phase shift.

As described above, when the symbol-based phase shift estimation is completed in the first slot corresponding to step 1, the slot-based phase shift can be estimated from the second slot corresponding to step 2 onwards. This is a method to supplement the symbol unit-based phase shift estimation method applied in step 1, and when there is a risk that the estimation performance of the phase shift may be deteriorated because the number of symbols (eg, three) to which the reference signal value for the control channel is assigned is small. A step-by-slot method is additionally applied. For example, if the phase shift of the first slot (composed of 14 symbols) is about 180 degrees, it can be estimated by supplementing that the speed of the moving object 210 is maintained at 300 km/h.

If only step 1 (symbol unit-based phase shift estimation) is applied, the speed of the moving object 210 can be estimated well, but the accuracy is low, and if only step 2 (slot unit based phase shift estimation) is applied Since it is similar to the conventional method, there is a disadvantage in that the high-speed section cannot be estimated well. Therefore, if the first and second steps are combined, the phase shift due to the Doppler shift can be overcome, and the disadvantage of the PDCCH 1 slot period can be overcome.

The compensator 320 may compensate for the phase shift of the plurality of symbols based on the estimated first and second moving speeds of the moving object 210 .

The compensator 320 derives a phase shift angle per symbol based on the first moving speed and the second moving speed of the moving object 210, and based on the derived phase shift angle, a signal value assigned to a plurality of symbols. A phase shift can be compensated for.

For example, referring to FIG. 5 , when the first moving speed and the second moving speed of the moving object 210 are estimated based on the phase shift based on the symbol unit and the slot unit, the compensator 320 performs the second slot ( A first phase shift angle (e.g., 13 degrees) between a first symbol (1 ^st symbol) and a second symbol (2 ^nd symbol) of 2 ^nd Slot is derived, and based on the first phase shift angle, By rotating the assigned signal value in the reverse direction, a phase shift with respect to the signal value assigned to the second symbol may be compensated.

Subsequently, the compensator 320 derives a second phase shift angle (eg, 26 degrees) between the compensated second symbol (2 ^nd symbol) and the third symbol (3 ^rd symbol) of the second slot (2 ^nd Slot) and, by rotating the signal value assigned to the third symbol in the reverse direction based on the second phase shift angle, the phase shift with respect to the signal value assigned to the third symbol may be compensated.

If the moving object 210 is moving at the same speed, at a moving speed of 300 km/h, it is enough to rotate by 13 degrees per one symbol. distortion can be overcome.

Even in the process of compensating for the phase shift, since the moving speed of the mobile 210 must be continuously estimated, as shown in FIG. 4 , the phase shift estimation must be continued on a symbol-by-symbol and slot-based basis for each slot period.

Meanwhile, those skilled in the art will fully understand that the receiver 300, the movement speed estimator 310, the compensator 320, and the setting unit 330 may each be implemented separately, or that one or more of them may be integrated. will be.

6 is a block diagram of the movable body 210 shown in FIG. 2 according to an embodiment of the present invention.

Referring to FIG. 6 , the moving object 210 may include a receiving unit 600 , a moving speed estimating unit 610 , and a compensating unit 620 . However, the movable body 210 illustrated in FIG. 6 is only one embodiment of the present invention, and various modifications are possible based on the components illustrated in FIG. 6 .

The receiver 600 may receive communication data including a plurality of slots from a base station (corresponding to the communication service providing apparatus 200 of FIG. 2 ) when the mobile body 210 moves at a high speed. Here, the communication data includes the number of symbols of the symbol to which the reference signal value for the control channel is assigned among the plurality of symbols and the slot period for the plurality of slots, and the number of symbols and the slot period may be set by the base station.

The moving speed estimator 610 estimates the first moving speed of the moving object 210 by comparing at least two symbols among a plurality of symbols included in the plurality of slots, and comparing at least two slots among the plurality of slots to compare the moving object. The second movement speed of 210 may be estimated.

The moving speed estimator 610 estimates the first moving speed of the mobile unit 210 on a symbol-by-symbol basis based on the number of symbols set by the base station, and based on the slot period set by the base station, the mobile unit 210 on a slot-by-slot basis. ) of the second movement speed can be estimated.

The movement speed estimator 610 estimates and estimates the first phase shift on a per-symbol basis by comparing the first symbol of the first slot and the second symbol of the first slot included in the plurality of slots according to the set number of symbols. The first moving speed of the movable body 210 may be estimated based on the first phase shift.

The movement speed estimator 610 compares the first symbol of the second slot included in the plurality of slots and the first symbol of the third slot included in the plurality of slots according to the set slot period, The second phase shift may be estimated, and the second moving speed of the mobile body 210 may be estimated based on the estimated second phase shift.

The compensator 620 may compensate for the phase shift of the plurality of symbols based on the estimated first and second moving speeds of the moving object 210 .

The compensator 620 derives a phase shift angle per symbol based on the estimated first and second moving speeds of the moving object 210, and a signal value assigned to a plurality of symbols based on the derived phase shift angle. It is possible to compensate for the phase shift for .

Meanwhile, those skilled in the art will fully understand that the receiver 600 , the movement speed estimator 610 , and the compensator 620 may be implemented separately, or one or more of them may be integrated.

7 is a flowchart illustrating a communication service providing method according to an embodiment of the present invention.

Referring to FIG. 7 , in step S701 , the communication service providing apparatus 200 may receive communication data including a plurality of slots from the mobile unit 210 .

In step S703, the communication service providing apparatus 200 estimates the first movement speed of the mobile body 210 by comparing at least two symbols among a plurality of symbols included in a plurality of slots constituting communication data, and The second moving speed of the mobile body 210 may be estimated by comparing at least two slots.

In operation S705 , the apparatus 200 for providing a communication service may compensate for phase shifts of the plurality of symbols based on the estimated first and second moving speeds of the moving object 210 .

In the above description, steps S701 to S705 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. In addition, some steps may be omitted if necessary, and the order between the steps may be changed.

8 is a flowchart illustrating a method of calculating the moving speed of the movable body 210 according to another embodiment of the present invention.

Referring to FIG. 8 , in step S801 , the communication service providing apparatus 200 includes a reference signal value for a control channel in a first slot among a plurality of slots (M slots) constituting the communication data received from the mobile unit 210 . When allocated to N symbols, the first phase shift on a per-symbol basis may be estimated by comparing the N-2 th symbol of the first slot and the N-1 th symbol of the first slot.

In operation S803, the apparatus 200 for providing a communication service may estimate the first phase shift on a symbol basis by comparing the N-1 th symbol and the N th symbol of the first slot.

In step S805 , the apparatus 200 for providing a communication service may calculate the first moving speed of the mobile unit 210 based on the first phase shift estimated on a symbol basis.

In step S807, the communication service providing apparatus 200 may estimate the second phase shift on a per-slot basis by comparing the first symbol of the second slot and the first symbol of the third slot.

In step S809, the communication service providing apparatus 200 may estimate the second phase shift on a per-slot basis by comparing the first symbol of the M-1 th slot and the first symbol of the M th slot.

In step S811 , the communication service providing apparatus 200 may calculate the second moving speed of the mobile body 210 based on the estimated second phase shift.

In the above description, steps S801 to S811 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. In addition, some steps may be omitted if necessary, and the order between steps may be changed.

An embodiment of the present invention may also be implemented in the form of a recording medium including instructions executable by a computer, such as a program module executed by a computer. Computer-readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. Also, computer-readable media may include all computer storage media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data.

The above description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. .

200: communication service providing device
210: mobile
300: receiver
310: movement speed estimation unit
320: compensation unit
330: setting unit

Claims (18)

A communication service providing device comprising:
a receiver for receiving communication data including a plurality of slots from a mobile body;
The first movement speed of the movable object is estimated by comparing at least two symbols among a plurality of symbols included in the plurality of slots, and the second movement speed of the movable object is estimated by comparing at least two slots among the plurality of slots. moving speed estimation unit; and
A compensator for compensating for a phase shift with respect to the plurality of symbols based on the first moving speed and the second moving speed
That comprising a, communication service providing device.
The method of claim 1,
A setting unit that sets the number of symbols to which a reference signal value (PDCCH DMRS, Physical Downlink Control Channel Demodulation Reference Signal) for a control channel is allocated among the plurality of symbols, and sets a slot period for the plurality of slots
Which will further include, a communication service providing device.
3. The method of claim 2,
The moving speed estimator estimates the first moving speed of the moving object on a symbol-by-symbol basis based on the set number of symbols, and estimating the second moving speed of the mobile on a slot-by-slot basis based on the set slot period. , a device for providing communication services.
4. The method of claim 3,
The movement speed estimator estimates the first phase shift on a symbol-by-symbol basis by comparing a first symbol of a first slot included in the plurality of slots and a second symbol of the first slot according to the set number of symbols, and estimating the first moving speed of the mobile body based on the estimated first phase shift.
4. The method of claim 3,
The movement speed estimator compares the first symbol of the second slot included in the plurality of slots and the first symbol of the third slot included in the plurality of slots according to the set slot period to obtain a second phase on a per-slot basis and estimating a displacement, and estimating a second moving speed of the mobile body based on the estimated second phase shift.
6. The method of claim 5,
The compensator derives a phase shift angle per symbol based on the first moving speed and the second moving speed, and compensates the phase shift for the signal values assigned to the plurality of symbols based on the derived phase shift angle. which is, a communication service providing device.
In a moving body,
a receiving unit for receiving communication data including a plurality of slots from a base station;
The first movement speed of the movable object is estimated by comparing at least two symbols among a plurality of symbols included in the plurality of slots, and the second movement speed of the movable object is estimated by comparing at least two slots among the plurality of slots. moving speed estimation unit; and
A compensator for compensating for a phase shift with respect to the plurality of symbols based on the first moving speed and the second moving speed
A moving body comprising a.
8. The method of claim 7,
The communication data includes a number of symbols of a symbol to which a reference signal value (PDCCH DMRS, Physical Downlink Control Channel Demodulation Reference Signal) for a control channel among the plurality of symbols is allocated and a slot period for the plurality of slots,
and the number of symbols and the slot period are set by the base station.
9. The method of claim 8,
The moving speed estimator estimates the first moving speed of the moving object on a symbol-by-symbol basis based on the set number of symbols, and estimating the second moving speed of the mobile on a slot-by-slot basis based on the set slot period. , mobile.
10. The method of claim 9,
The movement speed estimator estimates the first phase shift on a symbol-by-symbol basis by comparing a first symbol of a first slot included in the plurality of slots and a second symbol of the first slot according to the set number of symbols, and estimating the first moving speed of the moving object based on the estimated first phase shift.
10. The method of claim 9,
The movement speed estimator compares the first symbol of the second slot included in the plurality of slots and the first symbol of the third slot included in the plurality of slots according to the set slot period to obtain a second phase on a per-slot basis and estimating a displacement, and estimating a second moving speed of the movable body based on the estimated second phase shift.
12. The method of claim 11,
The compensator derives a phase shift angle per symbol based on the first moving speed and the second moving speed, and compensates the phase shift for the signal values assigned to the plurality of symbols based on the derived phase shift angle. What is to be done is a moving body.
In the communication service providing method performed by the communication service providing apparatus,
Receiving communication data including a plurality of slots from a mobile body;
estimating a first moving speed of the moving object by comparing at least two symbols among a plurality of symbols included in the plurality of slots;
estimating a second moving speed of the movable body by comparing at least two slots among the plurality of slots; and
Compensating for a phase shift for the plurality of symbols based on the first movement speed and the second movement speed
A method of providing a communication service comprising a.
14. The method of claim 13,
setting the number of symbols to which a reference signal value (PDCCH DMRS, Physical Downlink Control Channel Demodulation Reference Signal) for a control channel is allocated among the plurality of symbols; and
The method further comprising the step of setting a slot period for the plurality of slots, the communication service providing method.
15. The method of claim 14,
The estimating step
estimating the first movement speed of the mobile body on a symbol basis based on the set number of symbols; and
estimating the second movement speed of the mobile unit on a slot-by-slot basis based on the set slot period
A method of providing a communication service comprising a.
16. The method of claim 15,
The estimating step
estimating a first phase shift on a per-symbol basis by comparing a first symbol of a first slot and a second symbol of the first slot included in the plurality of slots according to the set number of symbols; and
estimating a first moving speed of the moving object based on the estimated first phase shift;
A method of providing a communication service comprising a.
16. The method of claim 15,
The estimating step
estimating a second phase shift on a per-slot basis by comparing a first symbol of a second slot included in the plurality of slots and a first symbol of a third slot included in the plurality of slots according to the set slot period; ; and
estimating a second moving speed of the moving object based on the estimated second phase shift;
A method of providing a communication service comprising a.
18. The method of claim 17,
The compensating step
deriving a phase shift angle per symbol based on the first movement speed and the second movement speed; and
Compensating for a phase shift with respect to the signal values assigned to the plurality of symbols based on the derived phase shift angle
A method of providing a communication service comprising a.

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