KR102301820B1 - Method and apparatus for determining of correction time - Google Patents

Abstract

The present invention relates to a method and apparatus for determining a correction time value according to a ranging connection at a receiving end of a wireless communication system. A receiving apparatus of a wireless communication system according to an embodiment of the present invention selects a first detection time interval and a second detection time interval from a RACH signal including a RACH preamble sequence for ranging access. a selector, a time offset detector for detecting a first time offset and a second time offset that are reception times of the preamble sequence in each of the selected first detection time interval and the second detection time interval, and the detected first time offset and and a time offset determiner configured to determine a correction time value for correction of a data transmission time of the transmitting end of the wireless communication system based on the second time offset.
This study was carried out with the support of the Ministry of Science, ICT and Future Planning's 'Prime Minister Giga KOREA Project'.

Description

Method and apparatus for determining calibration time of a wireless communication system

The present invention relates to a method and apparatus for determining a correction time value according to a ranging connection at a receiving end of a wireless communication system.

This study was carried out with the support of the Ministry of Science, ICT and Future Planning's 'Prime Minister Giga KOREA Project'.

Efforts are being made to develop an improved 5G (5th-generation) communication system or pre-5G communication system in order to meet the increasing demand for wireless data traffic after the commercialization of the 4G (4th-generation) communication system. For this reason, the 5G communication system or the pre-5G communication system is called a system after a 4G network (beyond 4G network) communication system or a long term evolution (LTE) system (post LTE).

As the three main use cases for 5G communication systems, the telecommunication industry, including the International Telecommunication Union (ITU) and the 3rd partnership project (3GPP), supports high-speed data support communication (enhanced Mobile Broadband, eMBB), ultra-reliability and low-latency communication (ultra). -reliable and low latency communications (URLLC), and massive machine type communication are proposed.

The 5G communication system is being considered for implementation in a very high frequency (mmWave) band (eg, such as a 60 gigabyte (60 GHz) band). In order to mitigate the path loss of radio waves and increase the propagation distance of radio waves in the ultra-high frequency band, in the 5G communication system, beamforming, massive MIMO, and full dimensional MIMO (FD-MIMO) are used. , array antenna, analog beam-forming, and large scale antenna technologies are being discussed.

In addition, in the 5G communication system, an evolved small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, and device-to-device communication (device) to device communication: D2D), wireless backhaul, moving network, cooperative communication, coordinated multi-points (CoMP), and technology development such as interference cancellation is losing

In addition, in the 5G system, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC), which are advanced coding modulation (ACM) methods, and filter bank multi carrier (FBMC), which are advanced access technologies, NOMA (non-orthogonal multiple access) and sparse code multiple access (SCMA) are being developed.

In addition, in the 5G communication system, a random access procedure for a terminal to communicate with a base station through a network is defined.

The RACH (random access channel) channel may be used for random access to the base station in a state in which uplink synchronization with the base station is not performed. The RACH channel is divided into initial ranging, in which the terminal accesses the base station for the first time in a state in which downlink synchronization is performed with the base station, and periodic ranging, in which the terminal accesses the base station as needed while connected to the base station. can be distinguished.

As an initial ranging process, when a signal is detected from the base station through a synchronization channel (SCH), the terminal may perform downlink synchronization in response to the SCH signal.

When downlink synchronization is performed, the UE may obtain a radio frame number (RFN), subframe boundary information, cell ID, and the like, and may obtain system information through a broadcast channel. Next, the UE may complete the system access process by performing uplink synchronization through the RACH channel using configuration information of a random access channel (RACH) channel included in the system information.

Meanwhile, in the 3GPP standard, a maximum cell radius for uplink synchronization between the base station and the terminal through the RACH channel is defined up to about 100 km. Accordingly, there is a need for the base station or the terminal to perform a separate operation procedure in order to operate the LTE service with a wider cell radius than the defined radius.

Accordingly, an object of the present invention is to provide a technique for detecting a random access channel (RACH) signal to support a wide cell radius between a receiving end (eg, a base station) and a transmitting end (eg, a terminal) that are separated by about 100 km or more. will be.

Another object of the present invention is to provide a time correction technique for synchronization between physical channels and a new operation scenario accordingly.

In addition, the technical problems to be solved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned are clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. can be

According to an embodiment of the present invention for achieving the above object, a receiving apparatus of a wireless communication system, for ranging access, a first detection time in a RACH signal including a random access channel (RACH) preamble sequence A signal section selector for selecting a section and a second detection time section, and a time for detecting the first time offset and the second time offset, which are the reception times of the preamble sequence in each of the selected first detection time section and the second detection time section and an offset detector, and a time offset determiner configured to determine a correction time value for correction of a data transmission time of the transmitting apparatus of the wireless communication system based on the detected first time offset and the second time offset.

In addition, according to another embodiment of the present invention for achieving the above object, a method for determining a correction time in a receiving apparatus of a wireless communication system includes a random access channel (RACH) preamble sequence for ranging access. selecting a first detection time interval and a second detection time interval in the RACH signal, a first time offset and a second time, which are reception times of the preamble sequence in each of the selected first detection time interval and the second detection time interval Detecting an offset, and determining a correction time value for correction of a data transmission time of a transmitting apparatus of the wireless communication system based on the detected first time offset and second time offset .

In addition, according to another embodiment of the present invention for achieving the above object, a computer-readable nonvolatile recording medium includes a first in a RACH signal including a random access channel (RACH) preamble sequence for ranging access. selecting a detection time interval and a second detection time interval, detecting a first time offset and a second time offset that are reception times of the preamble sequence in the selected first detection time interval and the second detection time interval, respectively and, based on the detected first time offset and the second time offset, determining a correction time value for correction of a data transmission time of the transmitting apparatus of the wireless communication system by the receiving apparatus (or processor) You can save a program to do that.

According to an embodiment of the present invention, a ranging connection of a transmitting end (eg, a terminal) located in a wide cell radius of about 100 km or more is possible only by changing a demodulation method and a scheduling procedure of a receiving end (eg, a base station) can

Accordingly, the additional installation cost of the receiving end can be saved, which can have an economic effect, and the communication service area can be extended to an area where installation of the receiving end is not easy (eg, an isolated area such as on the sea or an island). have.

In addition, the effects obtainable or predicted by the embodiments of the present invention are to be disclosed directly or implicitly in the detailed description of the embodiments of the present invention. For example, various effects predicted according to embodiments of the present invention will be disclosed in the detailed description to be described later.

1 is a diagram illustrating a RACH preamble for a ranging connection.
2 is a diagram illustrating a cell radius in which a receiving end according to a RACH signal can support a ranging connection.
3 is a diagram illustrating an uplink synchronization process between a transmitting end and a receiving end.
4 is a diagram illustrating a process in which a receiving end supports a ranging access of a wide cell radius according to an embodiment of the present invention.
5 is a diagram illustrating a block of a receiving end supporting a ranging connection of a wide cell radius according to an embodiment of the present invention.
6 is a diagram illustrating a process of estimating a time offset according to a RACH signal in a time offset determiner according to an embodiment of the present invention.
7 is a flowchart illustrating a process of estimating a time offset according to an embodiment of the present invention.
8 is a diagram illustrating an example of a flowchart for supporting uplink synchronization of a wide cell radius according to an embodiment of the present invention.
9 is a diagram illustrating another example of a flowchart for supporting uplink synchronization of a wide cell radius according to an embodiment of the present invention.
10 is a diagram illustrating another example of a flowchart for supporting uplink synchronization of a wide cell radius according to an embodiment of the present invention.
11 is a diagram illustrating a configuration of a receiving end supporting a ranging connection of a wide cell radius according to another embodiment of the present invention.
12 is a flowchart illustrating a method of determining a correction time at a receiving end of a wireless communication system according to an embodiment of the present invention.

Hereinafter, an operating principle of a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. The same components shown on the drawings are indicated by the same reference numbers as much as possible even though they are indicated on different drawings, and in the following, in describing an embodiment of the present invention, detailed descriptions of related well-known functions or configurations will be provided in the present invention. If it is determined that the gist of the above may be unnecessarily obscured, a detailed description thereof will be omitted. In addition, the terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

In addition, in an embodiment of the present invention, it will be understood that singular expressions such as "unless otherwise indicated" and "above" include plural expressions.

Also, terms including an ordinal number, such as first, second, etc., may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

In addition, terms used in an embodiment of the present invention are used only to describe a specific embodiment, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In this specification, terms such as "comprises" or "have" are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, but one or more other features It should be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

In addition, the terms "associated with" and "associated therewith" and derivatives thereof used in an embodiment of the present invention include, and be included in within, interconnect with, contain, be contained within, connect to or with, connect to, or couple to or with, be communicable with, cooperate with, interleave, juxtapose, and be closest to proximate to), likely to or likely to be bound to or with, to have, to have a property of, etc.

In addition, in an embodiment of the present invention, when it is stated that "a first component is (functionally or communicatively) connected" or "connected" to a second component, the certain component is the other component. It may refer to being directly connected to an element or connected through another element (eg, a third element).

In addition, in one embodiment of the present invention, unless otherwise defined, all terms used herein, including technical or scientific terms, are generally understood by those of ordinary skill in the art to which the present invention belongs. have the same meaning as Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in an embodiment of the present invention, an ideal or excessively formal meaning is not interpreted as

Prior to the detailed description of the present invention, examples of interpretable meanings of some terms used herein are provided. However, it should be noted that the interpretation examples presented below are not limited.

A base station (base station) is a subject that communicates with the terminal, and may be referred to as a BS, a NodeB (NB), an eNodB (eNB, evolved node B), an access point (AP), or the like.

A user equipment (or communication terminal) is an entity that communicates with a base station or other terminal, and is a node, a UE, a mobile station (MS), a mobile equipment (ME), a device, or It may also be referred to as a terminal or the like.

In the present invention, the transmitting end (or transmitting device) of the wireless communication system may be a device transmitting a random access channel (RACH) signal, and the receiving end (or receiving device) of the wireless communication system is the device receiving the RACH signal. can be

In the present disclosure, for convenience of explanation, the transmitting end of the communication system is referred to as a terminal, and the receiving end of the wireless communication system is referred to as a base station, but depending on the purpose of transmitting or receiving the RACH signal, the receiving end or the transmitting end may be any device. is of course For example, among the two terminals, the terminal transmitting the RACH signal may be the transmitting end, and the terminal receiving the RACH may be the receiving end.

The 3GPP LTE protocol provides various preamble sequences for uplink random access (UL random access).

First, a transmitting end (eg, a terminal) of a wireless communication system may obtain a radio frame number (RFN) and location information of a subframe through a synchronized downlink channel. And, based on the obtained information, it is possible to determine the location of the channel through which the RACH preamble sequence is to be transmitted. In addition, the transmitter may select one of a plurality of RACH preamble sequence formats and transmit the RACH preamble sequence through the identified channel.

A receiving end (eg, a base station) of the wireless communication system may detect the RACH preamble sequence and transmit a timing advance (TA) command including a correction time value for synchronizing uplink to the terminal.

The transmitting end may adjust the transmission time of data transmitted through the uplink channel by using the correction time value received from the receiving end.

Meanwhile, in the LTE standard, a Zadoff-Chu (ZC) sequence may be used as a sequence of the RACH preamble for uplink random access of the UE.

The ZC sequence may be defined as [Equation 1] as follows.

In the above equation, u is the index of the root ZC sequence, and N _ZC is the length of the ZC sequence, and may have a decimal value (eg, 839 or 139).

1 shows a RACH preamble for a ranging connection.

Referring to FIG. 1 , the RACH preamble 10 may include a cyclic prefix (CP) period 11 and a RACH preamble sequence period 12 that are guard periods as guard samples.

The preamble sequence 12 may be generated by changing the N _CS value for cyclic shift from the ZC sequence. At this time, N _CS Value N _ZC When set to a value, the ZC sequence may be used as one preamble sequence 12 .

In the 3GPP standard to transmit the RACH preamble 10 in response to various types of cell radii, the RACH preamble format includes a CP period, a RACH preamble sequence period, and a GT (guard time) period that is an interval for preventing interference between the next subframes. is defined as in [Table 1] below.

RACH Preamble Format Cyclic Prefix Length Sequence Length GT Cell Radius 0 (1 TTI) 3168 Ts 24576 Ts 2976 Ts 14.5 km 1 (2 TTI) 21024 Ts 24576 Ts 15840 Ts 77.3 km 2 (2 TTI) 6240 Ts 2X24576 Ts 6048 Ts 29.5 km 3 (3 TTI) 21024 Ts 2X24576 Ts 21984 Ts 100.1 km 4 (1 TTI) 448 Ts 4096 Ts 288 Ts 1.4 km

2 is a diagram illustrating a cell radius in which a receiving end according to a RACH signal can support a ranging connection.

Referring to FIG. 2 , a transmitter (eg, a terminal) may acquire subframe boundary information as location information of a subframe through a downlink synchronization channel, and transmit a RACH signal based thereon.

In this case, as shown in 201 of FIG. 2 , the transmitting end adjacent to the receiving end (eg, the base station) may transmit the RACH signal 221 at the starting point 211 of the subframe.

Also, as shown in 203 of FIG. 2 , the transmitting end located at the boundary of the cell covered by the receiving end transmits the RACH signal 223 with a delay by the delay of the downlink channel.

In this case, at 205 of FIG. 2 , the receiving end receives the RACH signal 225 delayed by a predetermined time from the time when the receiving end transmits the signal through the downlink channel from the transmitting end. In this case, the delayed time may be a round trip delay (RTD), which is a bidirectional delay time according to a distance between the receiving end and the transmitting end.

Here, the cyclic prefix (CP) serves to cover the distance between the receiving end and the transmitting end. In this case, the detection time interval of the RACH signal selected by the receiving end may be 215 of FIG. 2 .

The starting point of the first detection time period 215 may be determined not to exceed the length of the CP period in consideration of the max RTD time 231 and the delay spread time 233, which are the maximum bidirectional delay according to the maximum cell radius. have. And, the max RTD may be determined within the length of the GT section so as not to interfere with the next subframe. Therefore, it can be calculated as max RTD = min(CP - delay spread, GT) time.

The receiving end may predict the maximum cell radius based on the format of the RACH signal. In this case, the maximum cell radius for each RACH signal format conforming to the 3GPP standard may refer to the cell radius value of [Table 1] above.

Referring to [Table 1], it can be confirmed that the maximum cell radius supported by 3GPP LTE is about 100 km. In this case, after the receiving end detects the RACH signal, the maximum TA value capable of adjusting the data transmission time of the transmitting end through the uplink of the UE may be a value of 1282TA (= 20512 Ts, Ts = 1/30.72 MHz).

3 is a diagram illustrating an uplink synchronization process between a transmitting end and a receiving end.

Referring to FIG. 3 , first, in step 311 , a receiving end (eg, a base station) 301 may receive a RACH signal including a preamble sequence from a transmitting end (eg, a terminal) 302 .

In step 313, the receiving end 301, based on the received RACH signal, a TA command including a correction time value for correction of the data transmission time of the transmitting end 302, a random access response signal RAR (random access response) signal It can be transmitted to the transmitter 302 by including in the.

Accordingly, in step 315, the transmitting end 302 corrects the data transmission time based on the correction time value received in step 313 so as to be synchronized with the receiving end 301 for call connection, and sends a connection request to the receiving end 301. can do to

In response, when the receiving end 301 accepts the connection in step 317 , the transmitting end 302 may be synchronized with the receiving end 301 according to an uplink subframe boundary.

According to the format of the RACH preamble conforming to the current 3GPP standard, the receiving end can cover the access of the transmitting end up to a cell radius of about 100 km.

However, with the generalization of LTE service and the increase in power and efficiency of devices, a wider cell radius cover may be required.

Accordingly, in order to widen the cell radius covered by the receiving end, a method of changing the standard such as increasing the CP length or GT length of the RACH preamble may be considered. However, as the format length of the RACH preamble increases, resource allocation of a subframe is more required, and thus the data transmission amount may decrease.

Accordingly, there is a need for a technology that enables the receiving end to cover a wider cell radius while complying with the 3GPP standard.

According to various embodiments, in order to support a wide range of cell radii, a method of detecting a time offset of a wide range and a relationship between a receiving end and a transmitting end based on a time advance (TA) value that is a determined correction time value A scheme for link synchronization may be presented.

4 is a diagram illustrating a process in which a receiving end supports a ranging access of a wide cell radius according to an embodiment of the present invention.

The RACH preamble format used in FIG. 4 may be RACH preamble format 3 capable of supporting a cell radius of up to about 100 km.

The RACH preamble format 3 uses a RACH preamble sequence having a length of 2X24576Ts as a form of repeating a base sequence having a sequence length of 24576Ts in the time domain. In this case, the CP may use a length of 21024Ts, which is a part of the basic sequence.

In FIG. 4 , the receiving end selects the first detection time period 413 by delaying it by about CP length in consideration of the round trip delay (RTD) time at the synchronization start point 411 of the subframe, and detects the RACH signal in the selected period. can do. That is, the receiving end may detect the preamble sequence in the first detection time period 413 and detect a time offset based thereon. In addition, in order to support a wide cell radius exceeding about 100 km, the receiving end selects the second detection time period 415 with a delay of about CP length in consideration of the RTD time in the first detection time period 413 , and selects the selected A RACH signal can be detected in the interval. That is, the receiving end may detect the preamble sequence in the second detection time period 415 and detect the time offset based thereon.

For example, as shown in 401 of FIG. 4 , the transmitter adjacent to the receiver may transmit the RACH signal 421 at the start point 411 of the subframe.

In addition, as shown in 403 of FIG. 4 , a transmitter (eg, a terminal) located at the boundary of a cell with a radius of about 200 km, which is about twice the level of the 3GPP standard, is delayed by the delay of the downlink channel to transmit the RACH signal 423 . can

In this case, the receiving end receives the RACH signal 425 delayed by a predetermined time 431 compared to the time when the signal through the downlink channel is transmitted.

When the receiving end detects the RACH signal 425 by selecting the first detection time period 413, the receiving end receives the degraded RACH signal 425 due to the loss of sample data in the first detection time period 413. can be detected. That is, since there is ambiguity as much as the length of the preamble sequence (24567Ts = 1536 TA = 0.8 msec), a situation may occur in which it is difficult for the receiver to estimate the time offset. For example, a situation may occur in which it is difficult to distinguish a transmitter located at a distance of about 80 km from the receiving end and a transmitting end located at a distance of about 200 km from the receiving end by an estimated time offset value.

However, when the receiving end selects the second detection time period 415 to detect the RACH signal, the preamble sequence is detected and time offset from the receiving end to the transmitting end about 200 km away from the receiving end without deterioration of the RACH signal due to loss of sample data. can be estimated.

In other words, the transmitting end only needs to transmit the RACH signal without changing the standard or configuration, and the receiving end selects the RACH signal in a different detection section and detects a time offset from the RACH signal in the detection section. Detection of sequences and estimation of time offsets are possible.

On the other hand, in this case, by performing two detections for the same RACH signal, from the detection result, whether the receiving end that has transmitted the RACH signal is located within a short-distance radius between 0 km and about 100 km, or within a remote radius between 100 km and about 200 km. To determine, additional blocks may be required.

When the first and second time offsets are detected in different detection sections for the same RACH signal, the receiving end may determine a correction time value for correction of the data transmission time of the transmitting end based on the first and second time offsets. have. And, as described above in FIG. 3 , the receiving end may transmit the TA command including the correction time value to the RAR signal, which is the random access response signal, to the transmitting end (terminal). After receiving the RAR signal, the transmitting end moves forward the transmission time by the correction time value, and then transmits data through the uplink channel to establish synchronization of the uplink channel.

5 is a diagram illustrating a block for detecting a RACH signal of a receiving end supporting a ranging connection of a wide cell radius according to an embodiment of the present invention.

The receiving end (eg, the base station) 500 selects sample data from the RACH signal transmitted by the transmitting end for the first detection time interval, detects a preamble sequence, and a first time offset based on the detected preamble sequence can be detected. In addition, the receiving end 500 may perform the same detection process for a second detection time period delayed by about 1282TA from the first detection time period based on a round trip delay (RTD) time of a radius of about 100 km. That is, the receiving end 500 selects sample data from the RACH signal transmitted by the transmitting end for the second detection time period, detects the preamble sequence, and detects the second time offset based on the detected preamble sequence. .

Referring to FIG. 5 , the receiving end 500 may include a path for performing detection processing in a first detection time interval and a path performing detection processing in a second detection time interval.

In FIG. 5 , the receiving end 500 includes an RF processor 502 , an analog to digital converter 504 , a first ranging signal time interval selector 506 - 1 , and a second ranging signal time interval A selector 506-2, a first CP remover 508-1 and a second CP remover 508-2, a first serial to parallel converter 510-1, and a second S/P A transformer 510-2, at least one first FFT operator 512-1 and at least one second FFT operator 512-2, a first ranging frequency demapper ) (514-1) and a second ranging frequency de-placer (514-2), a preamble sequence generator (516), a first code demodulator (518-1) and a second code demodulator (518-2) ), a first IFFT operator (inverse fast fourier transform operator) 520-1 and a second IFFT operator 520-2, a first signal strength detector 522-1 and a second signal strength detector 522-2 , a first time offset detector 524-1, a second time offset detector 524-2, and a time offset determiner 526 may be included.

Referring to FIG. 5 , first, the RF processor 502 includes a filter, a frequency converter, and the like, and converts a radio frequency (RF) band signal received through a reception antenna into a baseband signal and outputs the converted signal. The A/D converter 504 converts the analog baseband signal from the RF processor 502 into a digital signal (sample data) and outputs it. Each of the first ranging time interval selector 506 - 1 and the second ranging time interval selector 506 - 2 selects and outputs each time interval from the sample data from the A/D converter 504 . Each of the first remover 508-1 and the second remover 508-2 removes the CP interval, which is the guard interval, from the sample data in the selected time interval and outputs it.

Each of the first S/P converter 510 - 1 and the second S/P converter 510 - 2 converts sample data from which the CP section is removed in parallel and outputs the converted sample data. Each of the first FFT operator 512-1 and the second FFT operator 512-2 performs a Fast Fourier Transform (FFT) operation on the parallel-converted sample data to output data in the frequency domain.

Each of the first ranging frequency inverse arranger 514-1 and the second ranging frequency inverse arranger 514-2 selects and outputs preamble data from data in the frequency domain.

The preamble sequence generator 516 sequentially generates the sequences of the preamble to the first sequence demodulator 518-1 and the second sequence demodulator 518-2.

The first sequence demodulator 518-1 and the second sequence demodulator 518-2, respectively, include the first ranging frequency de-placer 514-1 and the second ranging frequency de-placer 514-2 and the preamble sequence Sequence demodulation is performed by multiplying the preamble sequence from the generator 516 to generate as many correlation data as the number of sequences.

Each of the first IFFT operator 520-1 and the second IFFT operator 520-21 calculates correlation data and outputs correlation data in the time domain.

The first signal strength detector 522-1 and the second signal strength detector 522-2 detect a peak power or a normalized signal to noise ratio (SNR) from the correlation data. That is, the first signal strength detector 522-1 and the second signal strength detector 522-2 are the first signal strength of the RACH signal and the second signal strength of the RACH signal in the first detection time interval and the second detection time interval, respectively. Detect signal strength.

Each of the first time offset detector 524-1 and the second time offset detector 524-2 detects and outputs a time offset from the correlation data.

That is, each of the first time offset detector 524 - 1 and the second time offset detector 524 - 2 is a first time that is the reception time of the preamble sequence of the RACH signal in each of the first detection time interval and the second detection time interval An offset and a second time offset are detected.

The time offset determiner 526 uses the signal strength and time offset values detected in the first detection time interval and the signal strength values and time offset values detected in the second detection time interval, the data of the transmitter corresponding to the RACH signal A correction time value for adjusting the transmission time may be determined.

The receiving end 500 may include the final determined correction time value in the RAR signal, which is a response signal of the RACH signal, and provide it to the transmitting end.

6 is a diagram illustrating a process of estimating a time offset according to a RACH signal in a time offset determiner according to an embodiment of the present invention.

6 is a diagram illustrating an RACH signal received at a receiving end according to a distance between a receiving end and a transmitting end, assuming that the receiving end supports a cell radius of up to about 200 km.

Referring to FIG. 6 , the range that the receiver needs to detect in order to support a cell radius of about 200 km may be 0 to 2564 TA, and the length of the RACH preamble sequence is 1536 TA, and the time offset estimated in each section is 0 to 1536 TA. can be

6A shows the first detection time interval 621 and the time offset estimated in the time interval in square brackets “[]”.

In this case, the start point of the first detection time period 621 may be located at a point in time delayed by a predetermined time from the start point of the subframe in consideration of a round trip delay (RTD) time between the receiving end and the transmitting end. The predetermined time may be determined in consideration of the length of a cyclic prefix (CP) according to RACH preamble format 3, which can support a cell radius up to about 100 km, for example.

Also, in FIG. 6B , the second detection time interval 623 and the time offset estimated in the time interval are indicated in square brackets “[]”.

In this case, the start point of the second detection time period 623 may be located at a time delayed by a predetermined time from the start point of the first detection time period 621 in consideration of a round trip delay (RTD) time between the receiver and the transmitter. The predetermined time may be determined in consideration of the length of a cyclic prefix (CP) according to RACH preamble format 3, which can support a cell radius up to about 100 km, for example.

For example, when detecting a RACH signal of a short-range terminal having a cell radius within about 100 km, the time offset value detected in the first detection time interval 621 may be a value between 0 and 1282TA, and this value is It can be estimated as a time offset value. On the other hand, when the RACH signal of the short-range terminal is detected in the second detection time interval 623, since the start point of the subframe is delayed by 1282TA, the detected time offset value can be estimated as a value between 254TA to 1536TA. . That is, an offset may occur in the detection value.

That is, with respect to the first detection time period 621 of FIG. 6A , the time offset of the RACH signal 601 received from the terminal adjacent to the base station may be 0TA, and also within a cell radius of about 100 km. The time offset of the RACH signal 603 received by the terminal may be a value between 0TA and 1282TA. In addition, the time offset of the RACH signal 605 received from the remote terminal within a cell radius of about 100 km to 120 km may be a value between 1282TA and 1536TA.

Meanwhile, the second time offset detected in the second detection time period 623 of FIG. 6B may be converted into a modulo value in consideration of a round trip delay (RTD) length. For example, the detected second time offset may be estimated by converting it into a (time offset + 1282TA) mod1536TA value.

Accordingly, with respect to the second detection time interval 623 of FIG. 6(b), the time offset of the RACH signal 613 received from a short-range terminal within a cell radius of about 100 km can be estimated as a value between 254TA and 1536TA. have. In addition, the time offset of the RACH signal 615 received from the remote terminal within a cell radius of about 100 km to 120 km may be estimated as a value between 0TA and 254TA. In addition, the time offset of the RACH signal 617 received from the remote terminal within a cell radius of about 120 km to 200 km may be estimated as a value between 254TA and 1282TA.

On the other hand, in the section exceeding 1536TA in FIG. 6A , only a part of the RACH signal exists, so that ambiguity with respect to the time offset detection value may occur.

Accordingly, in FIG. 6 , the signal strength of each of the RACH signals may be detected in the first detection time period 621 and the second detection time period 623 . For example, the first signal strength detector 522-1 and the second signal strength detector 522-2 of FIG. 5 have peak power or normalized signal to noise ratio (SNR) in each time interval. can be detected individually.

In this case, for a remote terminal (transmitter) located in a cell radius of about 100 km or more, the signal strength in which only a part of the RACH signal is filled may be detected in the first detection time period 621, and in the second detection time period 623 The RACH signal may appear as a full-filled signal strength.

On the other hand, for a short-range terminal located within a cell radius of about 100 km, the RACH signal may appear as a full-filled signal strength in the first detection time interval 621, while the second detection time interval ( 623), a signal strength in which only a part of the RACH signal is filled may be detected.

Accordingly, the receiving end (base station) is based on the time offset and signal strength detected in each of the first detection time period 621 and the second detection time period 623, the transmitting end (terminal) transmitting the RACH signal is located in a short distance. It is possible to determine whether it is a located terminal or a remotely located terminal.

7 is a flowchart illustrating a process of estimating a time offset according to an embodiment of the present invention.

Referring to FIG. 7 , first, in step 701 , a receiving end (eg, a base station) may detect a RACH signal in each of a first detection time interval and a second detection time interval.

Next, in step 703 , the receiving end may convert the time offset detected in the second detection time interval into a (time offset + 1282TA) mod1536TA value.

And, in step 705, the receiving end may determine in which section the time offset is detected.

As a result of the determination in step 705, if the RACH signal is not detected in all sections of the first detection time interval and the second detection time interval, in step 707, the receiving end may determine that the time offset detection has failed.

Meanwhile, when the RACH signal is detected only in one of the two sections of the first detection time section and the second detection time section, in step 709, the receiving end may determine whether the detected time offset is greater than 1282TA.

If it is determined in step 709 that the detected time offset is greater than 1282TA, in step 715, the receiver may adopt the time offset value detected in the first detection time interval.

On the other hand, if it is determined in step 709 that the detected time offset is less than the value of 1282TA, in step 711, the receiver may determine whether the detected time offset is detected in the first detection time interval.

As a result of the determination in step 711, when the detected time offset is detected in the first detection time interval, in step 715, the receiving end may adopt the time offset value detected in the first detection time interval.

On the other hand, as a result of the determination in step 711, if the detected time offset is detected in the second detection time interval, in step 713, the receiving end adopts the sum of the time offset value detected in the second detection time interval and 1282TA. can

On the other hand, as a result of the determination in step 705, if it is determined that the time offset is detected in both sections of the first detection time section and the second detection time section, in step 717, the receiving end determines whether the detected time offset value is greater than the 1282TA value can do.

As a result of the determination in step 717, when the detected time offset value is greater than the 1282TA value, in step 715, the receiving end may adopt the time offset offset value detected in the first detection time interval.

On the other hand, if it is determined in step 717 that the detected time offset value is less than 1282TA, in step 719, the receiving end compares the RACH signal strength in the first detection time interval with the RACH signal strength in the second detection time interval. have.

As a result of the comparison in step 719 , in step 721 , the receiving end may determine whether the signal strength in the second detection time interval is greater than a predetermined threshold value.

As a result of the determination in step 721, if the signal strength in the second detection time interval is greater than the threshold value, in step 713, the receiving end may adopt a value obtained by summing the time offset value detected in the second detection time interval and 1282TA. have.

On the other hand, when the signal strength in the second detection time interval is less than the threshold value, in step 715 , the receiving end may adopt the time offset value detected in the first detection time interval.

The receiving end may estimate the adopted time offset value as a time offset value corresponding to the RACH signal through the process of FIG. 7 .

The receiving end may determine a TA value (time advance), which is a correction time value for adjusting the data transmission time, using the estimated time offset value, and may synchronize uplink between terminals based on this.

Meanwhile, since the range of providing a TA value (time advance) to the transmitter through RAR according to the 3GPP standard is limited to 1282TA (=20512Ts), it may be insufficient to cover a cell radius of about 100 km or more. In order to solve this problem, the range of the TA value defined in the 3GPP standard may be adjusted to be larger.

Alternatively, without changing the existing standard, the receiving end (base station) transmits the TA value by dividing the short-range transmitting end (terminal) located in the short distance and the remote transmitting end (terminal) located at a long distance, and improving the scheduler and the modem to achieve a wide-area cell can support Hereinafter, three embodiments for supporting the wide area cell by improving the scheduler and the modem will be described. However, the present invention is not limited thereto, and it goes without saying that the wide area cell can be supported with more various implementations.

In the first embodiment, the receiving end (eg, the base station) can support a wide area cell of about 100 km or more by extending the modem receiving unit.

The receiving end detects the RACH signal to detect the time delay for each transmitting end, which is the distance to each transmitting end (e.g., a terminal), and a short-distance transmitter located in a short distance with a cell radius of about 100 km or less, and a remote transmitter with a cell radius of about 100 km or more. The correction time value may be transmitted so that the located remote transmitters can be distinguished from each other.

For example, the receiving end may transmit a correction time value determined so that the OTA value becomes a reference as the uplink synchronization position to the transmitting end located in a short distance.

On the other hand, the receiving end may transmit the determined correction time value so that the 1282TA (=66.6usec) value delayed by a predetermined time becomes the reference as the uplink synchronization position to the terminals located at a distance. In this case, the correction time value TA' may be a value obtained by subtracting 1282TA from an estimated time offset value as TA' = measured TA - 1282TA. That is, the correction time value may be a value determined so that the transmitter transmits data with a predetermined time delay in the uplink synchronization position in consideration of the RTD time.

Accordingly, when receiving data through the uplink channel, the receiving end may receive each data based on the subframe boundary at the time 0TA and the subframe boundary at the time offset by 1282TA time.

Next, a medium access control (MAC) digital signal processor (DSP) processor may compare each processed information received from the modem. In addition, the MAC DSP processor may determine that the received information of the modem that has passed a cyclic redundancy check (CRC) is normal and perform MAC processing.

8 is a diagram illustrating an example of a flowchart for supporting uplink synchronization of a wide cell radius according to an embodiment of the present invention.

Referring to FIG. 8 , according to the first embodiment, the receiving end may extend the modem receiving unit to support uplink synchronization of a wide cell radius.

The receiving end may determine a correction time value for adjusting the data transmission time of the transmitting end of the wireless communication system by using the time offset value estimated in FIG. 7 .

First, in step 801, the receiving end may determine whether the time offset estimated from the RACH signal is equal to or greater than the 1282TA value.

If the time offset estimated from the RACH signal is less than or equal to the 1282TA value, in step 803, the receiving end adds a TA command including the estimated time offset value as a correction time value to the RAR signal, and the transmitting end located in a short distance (eg, the terminal) can be provided to

In step 805, the receiving end may perform demodulation by synchronizing data through an uplink synchronization channel (SCH) channel received from the transmitting end according to the OTA timing of the uplink subframe boundary.

On the other hand, if it is determined in step 801 that the estimated time offset is equal to or greater than the value of 1282TA, in step 807, the receiving end adds a TA command including a value obtained by subtracting 1282TA from the estimated time offset as a correction time value to the RAR signal and adds it to the transmitting end can be provided to

In step 809, the receiving end may perform demodulation in synchronization with the uplink subframe boundary + 1282TA offset when data is detected through the uplink SCH channel received from the transmitting end.

After step 805 or step 809, in step 811, the receiver may determine whether time offset management is performed for each transmitter.

In case of managing the time offset for each terminal, in step 813 , the receiving end may adopt a reception result corresponding to the synchronization time for each transmitting end.

On the other hand, when time offset management for each terminal is not performed, in step 815 , the receiving end may determine that data that has passed a cyclic redundancy check (CRC) is normal and perform MAC processing.

As a second embodiment, there may be a method of supporting a wide area cell of about 100 km or more by changing a scheduler.

The receiving end divides the transmitting end located in the short distance and the transmitting end located in the far distance by TTI (transmission time interval), so that the problem of muxing between subframes does not occur when processing the same TTI.

As described above, the receiving end may transmit the TA command to the transmitting end by setting the TA command to be divided based on the 0TA time and the 1282TA time as the uplink synchronization position.

Next, the receiving end processes the uplink channel of the transmitting end located in the short distance as allocated to the n-th TTI, which is the original position, like legacy processing, and the transmitting end located in the far end has n TTI offset of 1 It can be processed as being assigned to the +1-th TTI.

As described above, in the case of scheduling, the complexity of the receiver does not increase because only one process is performed as compared to the modem receiver performing demodulation twice on the same data in the first embodiment.

Meanwhile, since the uplink subframe boundary, which is the operation time of the modem, needs to be changed for each TTI, it may be necessary to differently adjust the buffering for each TTI by a preset time offset in the preprocessing block providing uplink data.

9 is a diagram illustrating another example of a flowchart for supporting uplink synchronization of a wide cell radius according to an embodiment of the present invention.

Referring to FIG. 9 , according to the second embodiment, the receiving end can support up-and-down link synchronization of a wide cell radius by using an improved TTI (Transmission Time Interval) scheduler.

First, in step 901, the receiving end may determine whether the time offset estimated from the RACH signal is equal to or greater than the 1282TA value.

If the estimated time offset is less than or equal to the 1282TA value, in step 903, the receiver adds a TA command including the estimated time offset value as a correction time value to the RAR signal and provides it to the transmitter (eg, the terminal) located in a short distance can do.

In step 905, the receiving end may allocate data through uplink received from the transmitting end located in the short distance to demodulation of the nth subframe.

Thereafter, in step 907, the receiving end may perform demodulation of the nth subframe according to the uplink synchronization time.

On the other hand, if it is determined in step 901 that the estimated time offset is equal to or greater than the value of 1282TA, in step 909, the receiving end adds a TA command including a value obtained by subtracting the value of 1282TA from the estimated time offset as a correction time value to the RAR signal and adds the transmitting end can be provided to

Then, in step 911, the receiving end may allocate and process the data through the uplink received from the transmitting end located in the short distance to demodulation of the n+1th subframe.

Thereafter, in step 913, the receiving end may perform demodulation of the n+1-th subframe by advancing by a value obtained by subtracting the 254TA value from the uplink synchronization time.

After step 907 or step 913, in step 915, the receiving end may transmit the received data as n-th TTI received data to the MAC.

As a third embodiment, there may be a method of separating and operating resources by frequency.

In the LTE system, when operating a CA (carrier aggregation) method using a multi-carrier, a PCell (primary cell) group and a SCell (secondary cell) group are separated to perform downlink synchronization and uplink synchronization. Each can be operated differently.

In this case, the receiving end may distinguish a transmitting end located at a short distance and a transmitting end located at a far distance through detection of the RACH signal, and may allocate the short-range transmitting end to the PCell and the remote transmitting end to the SCell. That is, the PCell group may operate with synchronization between downlink and uplink based on 0TA, and the SCell group may operate with synchronization between downlink and uplink based on 1282TA. Accordingly, it is possible to operate without a change in the physical layer (PHY) stage.

On the other hand, operating in synchronization between downlink and uplink means that, when the receiving end is processed by the PHY end, the downlink transmits data in advance by 1282TAs than the uplink, so that the transmitting end located at a remote location performs downlink synchronization. After that, when the uplink data is transmitted immediately, the receiving end may mean that the uplink data is received based on 0TA. This may have an effect of pulling the transmitter located at a distance located in a cell radius of about 100 km or more to the base station by about 100 km.

10 is a diagram illustrating another example of a flowchart for supporting uplink synchronization of a wide cell radius according to an embodiment of the present invention.

Referring to FIG. 10 , according to the third embodiment, the receiving end may support uplink synchronization of a wide cell radius by separating and operating resources by frequency.

First, in step 1001, the receiving end may determine whether the time offset estimated from the RACH signal is equal to or greater than the 1282TA value.

If the estimated time offset is equal to or less than the value of 1282TA, in step 1003, the receiving end may add a TA command including the estimated time offset as a correction time value to the RAR signal to provide it to the transmitting end located in a short distance.

In step 1005, the receiving end may schedule the transmitting end located in a short distance on a carrier to which the PCell belongs.

Next, in step 1007, the modem for processing the carrier of the receiving end may process the carrier by matching synchronization time points between downlink and uplink based on OTA.

On the other hand, if it is determined in step 1001 that the estimated time offset is equal to or greater than the value of 1282TA, in step 1009, the receiving end adds a TA command including a value obtained by subtracting the value of 1282TA from the estimated time offset as a correction time value to the RAR signal to the transmitting end. can provide

Next, in step 1011, the receiving end may schedule the remote transmitting end having a time offset equal to or greater than 1282TA on a carrier belonging to the SCell.

In step 1013, the modem processing the carrier of the receiving end may process the carrier by advancing the downlink synchronization time by a predetermined time (eg, 1282TA) compared to the uplink synchronization time.

11 is a diagram illustrating a configuration of a receiving end supporting a ranging connection of a wide cell radius according to another embodiment of the present invention.

Referring to FIG. 11 , a receiving end (eg, a base station) may include a time interval selector 506 , a time offset detector 524 , and a time offset determiner 526 .

In FIG. 11 , the time interval selector 506 may correspond to the first ranging signal time interval selector 506 - 1 and the second ranging signal time interval selector 506 - 2 of FIG. 5 . In addition, the time offset detector 524 may correspond to the first time offset detector 524-1 and the second time offset detectors 524-1 of FIG. 5, and the time offset determiner 526 is shown in FIG. may correspond to the time offset determiner 526 of .

According to various embodiments, the time interval selector 506 may select a first detection time interval and a second detection time interval from the RACH signal including the RACH preamble sequence for ranging access. Next, the time offset detector 524 may detect the first time offset and the second time offset, which are reception times of the preamble sequence, in each of the selected first detection time interval and the second detection time interval. In addition, the time offset determiner 526 may determine a correction time value for correcting the data transmission time of the transmitting end of the wireless communication system based on the detected first time offset and the second time offset. In this case, the RACH signal may include a cyclic prefix (CP) period that is a guard period, a RACH preamble sequence period, and a GT period that is an interference prevention period (guard time).

According to various embodiments, the receiving end may further include a signal strength detector. The signal strength detector may correspond to the first signal strength detector 522-1 and the second signal strength detector 522-2 of FIG. 5 . In this case, the signal strength detector may detect the first signal strength and the second signal strength in each of the first detection time interval and the second detection time interval. And, the time offset determiner 526 is based on the detected first time offset, the second time offset, the first signal strength and the second signal strength, the data transmission time of the transmitting end of the wireless communication system A calibration time value for adjustment can be determined.

According to various embodiments, the start point of the first detection time interval may be delayed by a predetermined time from the start point of the subframe in consideration of a round trip delay (RTD) time between the receiving end and the transmitting end.

According to various embodiments, the start point of the second detection time period may be delayed by a predetermined time from the start point of the first detection time period in consideration of a round trip delay (RTD) time between the receiver and the transmitter.

According to various embodiments, the time offset determiner 526 may estimate a time offset value in consideration of the RTD time based on the detected first time offset and the second time offset. In addition, the time offset determiner 526 may determine a correction time value for correction of the data transmission time of the transmitter using the estimated time offset value. In this case, when estimating the time offset value, the time offset determiner 526 may convert the second time offset into a modulo value in consideration of the RTD time.

According to various embodiments, the correction time value may be a value determined to transmit data with a predetermined time delay at an uplink synchronization position with the transmitter in consideration of the RTD time when the transmitter is located in a far radius from the receiver. In this case, the far radius is a distance of about 100 km or more from the receiving end, and the predetermined time may be about 1282TA.

According to various embodiments, the receiving end may further include a transmitter that transmits the RACH signal by including a correction time value in a random access response (RAR) signal that is a response signal.

12 is a flowchart illustrating a method of determining a correction time at a receiving end of a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 12 , in step 1201, the receiving end may select a first detection time interval and a second detection time interval from the RACH signal including the RACH preamble sequence.

In this case, the start point of the first detection time interval may be delayed by a predetermined time from the start point of the subframe in consideration of the RTD time between the receiving end and the transmitting end. In addition, the start point of the second detection time period may be delayed by a predetermined time from the start point of the first detection time period in consideration of the RTD time between the receiving end and the transmitting end.

Next, in step 1203, the receiving end may detect the first time offset and the second time offset, which are reception times of the preamble sequence in the selected first detection time period and the second detection time period, respectively.

And, in operation 1205, the receiving end may determine a correction time value for correcting the data transmission time of the transmitting end of the wireless communication system based on the detected first time offset and the second time offset.

According to various embodiments, the method of determining the correction time may further include detecting the first signal strength and the second signal strength in each of the first detection time interval and the second detection time interval. In this case, the operation of determining the correction time value is based on the detected first time offset, the second time offset, the first signal strength, and the second signal strength, for adjusting the data transmission time of the transmitting end of the wireless communication system. A calibration time value can be determined.

According to various embodiments, the determining of the correction time value includes estimating a time offset value in consideration of the RTD time based on the detected first time offset and the second time offset, and using the estimated time offset value , it is possible to determine a correction time value for correction of the data transmission time of the transmitter. In this case, when estimating the time offset value, the second time offset may be estimated by converting it into a modulo value in consideration of the RTD time.

According to various embodiments, the correction time value may be a value determined to transmit data with a predetermined time delay at an uplink synchronization position with the transmitter in consideration of the RTD length when the transmitter is located in a far radius from the receiver. In this case, the far radius is a distance of about 100 km or more from the receiving end, and the predetermined time may be about 1282TA.

According to various embodiments, when a correction time value for correction of a data transmission time is determined, the correction time value may be transmitted by being included in an RAR signal that is a response signal to the RACH signal.

According to various embodiments, the RACH signal may include a CP period that is a guard period, a RACH preamble sequence period, and a GT period that is an interference prevention period with the next subframe.

In the present invention, a method for estimating a time offset of a preamble sequence transmitted from a transmitter located in a wide cell radius of about 100 km or more and a method for synchronizing uplink according to the method are presented. On the other hand, in the embodiment of the present invention, detailed operation or change is not mentioned for easy understanding, but a method of estimating a time offset and synchronizing an uplink using this is implemented and modified in various ways for those skilled in the art. This may be possible.

In addition, embodiments of the present invention are not limited to the 3GPP LTE system, and may be applicable to various wireless communication systems that perform communication through synchronization between a receiving end and a transmitting end while having a ranging procedure. For example, embodiments of the present invention are applicable to wireless communication systems such as eMTC, NB-IoT, V2X, and the like.

At least a portion of the receiving end (eg, modules or functions thereof) or method (eg, operations) of the present disclosure according to an embodiment is a computer-readable non-transitory recording medium (non-transitory) in the form of a program module It can be implemented as a command stored in -transitory computer readable media). When the instruction is executed by the processor, the processor may perform a function corresponding to the instruction.

Here, the program is stored in a computer-readable non-transitory recording medium, read and executed by the computer, thereby implementing the embodiment of the present invention.

Here, the non-transitory recording medium means a medium that stores data semi-permanently and can be read by a device, as well as a volatile or non-volatile medium that temporarily stores data for calculation or transmission, such as registers, caches, and buffers. It may contain memory. On the other hand, a temporary transmission medium such as a signal or current does not correspond to a non-transitory recording medium.

Specifically, the above-described programs may be provided by being stored in a non-transitory readable recording medium such as a CD, DVD, hard disk, Blu-ray disk, USB, internal memory of the device of the present disclosure, memory card, ROM or RAM.

In addition, the above-mentioned programs are stored in the memory of the server and transmitted for sale to a terminal (eg, the device of the present invention) connected to the server by a network, or the provider of the program (eg, a program developer or a program manufacturer) may be transferred or registered on the server by

In addition, when the above-described programs are sold from the server to the terminal, at least a portion of the programs may be temporarily created in a buffer of the server for transmission. In this case, the server's buffer may be the non-transitory recording medium of the present disclosure.

According to an embodiment, the computer-readable non-transitory recording medium includes an operation for selecting a first detection time interval and a second detection time interval from a RACH signal including a RACH preamble sequence for ranging access, the selected second detection time interval Detecting a first time offset and a second time offset that are reception times of the preamble sequence in each of the first detection time period and the second detection time period, and based on the detected first time offset and the second time offset , a program for causing the receiving end of the present disclosure to perform an operation of determining a correction time value for correction of the data transmission time of the transmitting end of the wireless communication system may be stored.

Meanwhile, although specific embodiments have been described in the detailed description of the present invention, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments and should be defined by the claims described below as well as the claims and equivalents.

506: time interval selector 524: time offset detector
526: time offset determiner

Claims (20)

A receiving device for a wireless communication system, comprising:
transceiver; and
Select a first detection time interval and a second detection time interval for reception of a RACH signal including a random access channel (RACH) preamble sequence, and whether the RACH preamble sequence is detected in the first detection time interval or the RACH preamble It is determined whether a sequence is detected in the second detection time interval, and when the RACH preamble sequence is detected in the second detection time interval, based on a time point at which the RACH preamble sequence is received in the second detection time interval Identifies a second time offset, and determines a correction time value for correction of a data transmission time of the transmitting apparatus of the wireless communication system based on the second time offset, and that the correction time value is greater than a preset value is identified, and a value obtained by subtracting the preset value from the correction time value is determined as a timing advance (TA) value, and when the RACH preamble sequence is detected in the first detection time interval, the RACH preamble sequence is the first Identifies a first time offset based on a time received in the detection time interval, and determines the correction time value for correction of a data transmission time of the transmitting device of the wireless communication system based on the first time offset, At least one processor that determines the correction time value as the TA value and transmits a random access response (RAR) message including the determined TA value to the transmitter through the transceiver in response to the RACH signal receiving device. According to claim 1,
the at least one processor,
detecting a first signal strength and a second signal strength in each of the first detection time interval and the second detection time interval, and based on the first signal strength and the second signal strength, the RACH preamble sequence is and determining whether the RACH preamble sequence is detected in the first detection time interval or the RACH preamble sequence is detected in the second detection time interval. According to claim 1,
The start point of the first detection time period is delayed by a predetermined time from the start point of the subframe in consideration of a round trip delay (RTD) time between the receiver and the transmitter. According to claim 1,
The start point of the second detection time period is delayed by a predetermined time from the start point of the first detection time period in consideration of a round trip delay (RTD) time between the receiver and the transmitter. According to claim 1,
the at least one processor,
A time offset is determined according to a modulo operation based on the second time offset and a round trip delay (RTD) time value, and based on the time offset, the correction for correcting a data transmission time of the transmitter A receiving device, characterized in that it determines a time value. delete According to claim 1,
The correction time value is
When the transmitting device is located outside a preset radius from the receiving device, it is a value determined to transmit data with a predetermined time delay at an uplink synchronization position with the transmitting device in consideration of a round trip delay (RTD) time value receiving device. 8. The method of claim 7,
The preset radius is 100 km from the receiving device, and the predetermined time is a value of 1282TA. delete According to claim 1,
The RACH signal includes a cyclic prefix (CP) period that is a guard period, the RACH preamble sequence period, and a GT period that is an interference prevention period with a next subframe (guard time). A method performed by a receiving device of a wireless communication system, comprising:
selecting a first detection time interval and a second detection time interval for reception of a RACH signal including a random access channel (RACH) preamble sequence;
determining whether the RACH preamble sequence is detected in the first detection time interval or the RACH preamble sequence is detected in the second detection time interval;
When the RACH preamble sequence is detected in the first detection time interval, a second time offset is identified based on a time point at which the RACH preamble sequence is received in the second detection time interval, and based on the second time offset Determine a correction time value for correction of data transmission time of the transmitting device of the wireless communication system, identify that the correction time value is greater than a preset value, and subtract the preset value from the correction time value TA (timing advance) determining a value;
When the RACH preamble sequence is detected in the first detection time interval, a first time offset is identified based on a time point at which the RACH preamble sequence is received in the first detection time interval, and based on the first time offset determining the correction time value for correction of the data transmission timing of the transmitting device of the wireless communication system, and determining the correction time value as the TA value; and
and transmitting a random access response (RAR) message including the determined TA value to the transmitter in response to the RACH signal. 12. The method of claim 11, wherein determining whether the RACH preamble sequence is detected in the first detection time interval or the RACH preamble sequence is detected in the second detection time interval comprises:
detecting a first signal strength and a second signal strength in each of the first detection time interval and the second detection time interval; and
Based on the first signal strength and the second signal strength, determining whether the RACH preamble sequence is detected in the first detection time interval or the RACH preamble sequence is detected in the second detection time interval A method characterized in that. 12. The method of claim 11,
The start point of the first detection time period is delayed by a predetermined time from the start point of the subframe in consideration of a round trip delay (RTD) time between the receiver and the transmitter. 12. The method of claim 11,
The start point of the second detection time period is delayed by a predetermined time from the start point of the first detection time period in consideration of a round trip delay (RTD) time between the receiver and the transmitter. 12. The method of claim 11, wherein the time offset is determined according to a modulo operation based on the second time offset and a round trip delay (RTD) time value, and the correction time for correcting the data transmission time of the transmitter and a value is determined based on the time offset value. delete 12. The method of claim 11,
The correction time value is
When the transmitting device is located outside a preset radius from the receiving device, it is a value determined to transmit data with a predetermined time delay at an uplink synchronization position with the transmitting device in consideration of a round trip delay (RTD) time value How to. 18. The method of claim 17,
The preset radius is 100 km from the receiving device, and the predetermined time is a value of 1282TA. delete 12. The method of claim 11,
The RACH signal includes a cyclic prefix (CP) period that is a guard period, the RACH preamble sequence period, and a GT period that is an interference prevention period with a next subframe (guard time).

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