KR20180053205A - Method and apparatus for determining of correction time - Google Patents

Abstract

The present invention relates to a method for determining a correction time value according to a ranging connection at a receiving end of a wireless communication system and a device therefor. A receiving device of a wireless communication system according to an embodiment of the present invention comprises: a signal interval selector selecting a first detection time interval and a second detection time interval in an RACH signal including an RACH preamble sequence for a ranging connection; a time offset detector detecting a first time offset and a second time offset, which are reception timings of the preamble sequence in each of the selected first and second detection time intervals; and a time offset determiner determining a correction time value for correcting a data transmission time point of a transmitting end of the wireless communication system based on the detected first and second time offsets. The research was carried out with the support of ′Giga KOREA Project′ of the Ministry of Science, ICT and Future Planning. According to the present invention, a ranging connection of a transmitting end located in a wide cell radius of about 100 km or more can be enabled only by changing the demodulation method and the scheduling procedure of a receiving end.

Description

[0001] METHOD AND APPARATUS FOR DETERMINING OF CORRECTION TIME [0002]

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

This study was carried out with the support of the "Giga KOREA Project".

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

5G communication system, the telecommunication industry including the International Telecommunication Union (ITU) and the 3GPP (3rd partnership project) has developed a high-speed data communication system such as enhanced Mobile Broadband (eMBB) -reliable and low latency communications, URLLC) and massive machine type communication.

5G communication systems are being considered for implementation in very high frequency (mmWave) bands (e.g., 60 gigahertz (60GHz) bands). In 5G communication system, beamforming, massive MIMO, and full-dimensional MIMO (FD-MIMO) are used to reduce propagation path loss and propagation distance of radio waves in a very high frequency band. , Array antennas, analog beam-forming, and large scale antenna technologies are being discussed.

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

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

The 5G communication system also defines a random access procedure for the terminal to communicate with the base station via the network.

A random access channel (RACH) channel can be used for random access to a base station in a state where a mobile station does not perform uplink synchronization with a base station. The RACH channel is an initial ranging mode in which the UE is connected to the first base station in a downlink synchronized state with the BS, and a periodic ranging mode in which the UE is connected to the BS in accordance with the needs of the UE Can be distinguished.

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

When downlink synchronization is performed, the UE acquires radio frame number (RFN), subframe boundary information, cell ID, and the like, and obtains system information through a broadcast channel. Next, the UE can complete the system access procedure 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 cell radius capable of uplink synchronization between a base station and a terminal over a RACH channel is defined up to about 100 km. Accordingly, there is a need for a base station or a terminal to perform a separate operating procedure in order to operate an LTE service with a wider cell radius than the defined radius.

It is therefore an object of the present invention to provide a technique for detecting a random access channel (RACH) signal to support a wide cell radius between a receiving end (for example, a base station) and a transmitting end (for example, will be.

It is also an object of the present invention to provide a time correction technique for synchronization between physical channels and a new operating scenario accordingly.

In addition, the technical problem to be solved by the present invention is not limited to the above-mentioned technical problems, but other technical problems which are not mentioned can be clearly understood from the following description to those skilled in the art to which the present invention belongs .

According to an aspect of the present invention, there is provided a receiving apparatus of a wireless communication system, the apparatus including a receiving unit configured to receive a RACH signal including a random access channel (RACH) preamble sequence for a ranging access, A time interval for detecting a first time offset and a second time offset, which are reception timings of the preamble sequence in each of the selected first detection time interval and the second detection time interval, An offset detector and a time offset determiner for determining a correction time value for correcting the data transmission time point of the transmitting apparatus of the wireless communication system based on the detected first time offset and the second time offset.

According to another aspect of the present invention, there is provided a method of determining a correction time in a receiving apparatus of a wireless communication system, the method comprising: 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, selecting a first time offset, which is a reception time of the preamble sequence in each of the selected first detection time interval and the second detection time interval, And determining a correction time value for correction of a data transmission time point of the transmitting apparatus of the wireless communication system based on the detected first time offset and the second time offset .

According to another aspect of the present invention, there is provided a computer readable nonvolatile storage medium for storing a random access channel (RACH) preamble sequence for a ranging access, Detecting a first time offset and a second time offset, which are reception timings of the preamble sequence, in each of the selected first detection time interval and the second detection time interval, selecting a detection time interval and a second detection time interval, And determining, based on the detected first time offset and the second time offset, a correction time value for correcting the data transmission time point of the transmitting apparatus of the wireless communication system, by the receiving apparatus (or the processor) You can save a program to do so.

According to the embodiment of the present invention, a ranging connection of a transmitting terminal (for example, a terminal) located in a wide cell radius of about 100 km or more can be performed only by changing a demodulation method and a scheduling procedure of a receiving terminal .

Accordingly, the additional installation cost of the receiving terminal can be saved, and the communication service area can be extended to an area where the receiving end is not easy to install (for example, an isolated area such as the sea or island) have.

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

1 is a diagram showing a RACH preamble for ranging access.
2 is a diagram illustrating a cell radius capable of supporting a ranging access by a receiving end according to an RACH signal.
3 is a diagram illustrating an uplink synchronization process between a transmitting end and a receiving end.
4 is a diagram illustrating a process of supporting a ranging access of a wide cell radius according to an exemplary embodiment of the present invention.
5 is a block diagram of a receiving terminal supporting ranging access 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 an RACH signal in a time offset estimator 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.
FIG. 8 is a flowchart illustrating a method for supporting uplink synchronization of a wide cell radius according to an exemplary embodiment of the present invention. Referring to FIG.
9 is a diagram illustrating another example of a flowchart supporting uplink synchronization of a wide cell radius according to an embodiment of the present invention.
10 is a flowchart illustrating a method for supporting uplink synchronization of a wide cell radius according to an exemplary embodiment of the present invention. Referring to FIG.
11 is a diagram illustrating a configuration of a receiving terminal supporting ranging access 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 in a receiving end of a wireless communication system according to an embodiment of the present invention.

The operation principle of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The detailed description thereof will be omitted. The following terms are defined in consideration of functions in an embodiment of the present invention, which may vary depending on the intention of a user, an operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

It is also to be understood that the singular expressions "a" and "the" include plural referents unless the context clearly dictates otherwise in an embodiment of the invention.

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

Moreover, the terms used in one embodiment of the present invention are used only to describe specific embodiments and are not intended to limit the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Also, the terms " associated with " and " associated therewith ", as well as derivatives thereof, used in an embodiment of the present invention are intended to be inclusive and not restrictive, to connect to or with, to connect with, to connect with, or to, with, or with, within, within, They are also able to communicate with, be communicable with, cooperate with, interleave, juxtapose, closest to, and so on. It is possible to have a close proximity to one another, to be bound to or with, to have a property of, and so on.

Further, in an embodiment of the present invention, when it is mentioned that " the first component is connected (functionally or communicatively) " or " connected " to the second component, May be directly connected to an element, or may be connected through another element (e.g., a third element).

Furthermore, in one embodiment of the present invention, all terms used herein, including technical or scientific terms, unless otherwise defined, are intended to be generically and explicitly understood by those skilled in the art to which the invention pertains Have the same meaning. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and, unless explicitly defined in the embodiments of the present invention, are intended to mean ideal or overly formal .

Prior to the detailed description of the present invention, an example of an interpretable meaning is provided for some terms used herein. However, it should be noted that the present invention is not limited to the interpretation given below.

A base station may be referred to as a BS, a Node B (NB), an eNode B (eNB), an access point (AP), or the like,

A user equipment (or a communication terminal) is a node that communicates with a base station or another terminal and includes a node, a UE, a mobile station (MS), a mobile equipment (ME), a device, A terminal, or the like.

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

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

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

First, a transmitting end (for example, a terminal) of a wireless communication system can acquire position information of a radio frame number (RFN) and a subframe through a synchronized downlink channel. Then, based on the obtained information, the position of a channel to transmit the RACH preamble sequence can be grasped. The transmitting terminal may select one of a plurality of RACH preamble sequence formats and transmit the RACH preamble sequence through the identified channel.

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

The transmitting end can adjust the transmission time point of the data to be transmitted through the uplink channel using the correction time value received from the receiving end.

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

The ZC sequence can be defined as the following equation (1).

Where 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 (e.g., 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) interval 11 and a RACH preamble sequence interval 12, which are guard intervals, as guard samples.

The preamble sequence 12 may be generated with a different N _CS value for cyclic shift from the ZC sequence. At this time, N _CS The value is N _ZC Value, the ZC sequence can be used as one preamble sequence 12. In this case,

In the 3GPP standard, in order to transmit the RACH preamble 10 corresponding to various types of cell radii, a RACH preamble format including a CP interval, a RACH preamble sequence interval, and a GT (guard time) interval for preventing interference between the next subframes Is defined as [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 capable of supporting a ranging access by a receiving end according to an RACH signal.

Referring to FIG. 2, a transmitter (for example, a terminal) may acquire subframe boundary information as position information of a subframe through a downlink synchronization channel, and may transmit a RACH signal based on the subframe boundary information.

In this case, as shown in 201 of FIG. 2, the transmitting terminal adjacent to the receiving end (for example, the base station) can 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 is delayed by the delay of the downlink channel to transmit the RACH signal 223.

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

In this case, a 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 in FIG.

The starting point of the first detection time interval 215 may be determined so as not to exceed the length of the CP interval in consideration of the maximal bidirectional delay, max RTD time 231 and delay spread time 233, have. The max RTD can be determined to be 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 can predict the maximum cell radius based on the format of the RACH signal. In this case, the maximum cell radius for each of the RACH signal formats conforming to the 3GPP standard can refer to the value of the cell radius of Table 1 described above.

Referring to Table 1, it can be seen that the maximum cell radius supportable in 3GPP LTE is about 100 km. In this case, the maximum TA value that can adjust the data transmission time of the transmitter through the uplink of the terminal after the RACH signal is detected by the receiver may be 1282 TA (= 20512 Ts, Ts = 1 / 30.72 MHz).

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

3, a receiving end (e.g., a base station) 301 may receive a RACH signal including a preamble sequence from a transmitting end (e.g., a terminal) 302 in step 311. [

In step 313, based on the received RACH signal, the receiving end 301 transmits a TA command including a correction time value for correcting the data transmission time of the transmitting end 302 to a random access response (RAR) To the transmitting terminal 302. [0050]

Accordingly, in step 315, the transmitting terminal 302 corrects the data transmission time point based on the correction time value received in step 313 so as to synchronize with the receiving terminal 301 for call connection, and transmits a connection request to the receiving terminal 301, I can do it.

In response to this, in step 317, if the receiving end 301 accepts the connection, the transmitting end 302 can synchronize with the receiving end 301 in accordance with the uplink subframe boundary.

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

However, coverage of wider cell radius may be required as the generalization of LTE services and the power and efficiency of the devices increase.

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

Therefore, there is a need for a technique that allows the receiving end to cover a larger cell radius in accordance with the 3GPP specification.

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

4 is a diagram illustrating a process of supporting a ranging access of a wide cell radius according to an exemplary embodiment of the present invention.

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

The RACH preamble format 3 uses a RACH preamble sequence of 2X24576Ts in length to repeat a base sequence having a sequence length of 24576Ts in the time domain. In this case, the CP can use a length of 21024Ts, which is part of the base sequence.

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

For example, as shown in 401 of FIG. 4, the transmitting end adjacent to the receiving end may transmit the RACH signal 421 at the starting point 411 of the subframe.

4, a transmitting terminal (for example, a terminal) located at a boundary of a cell having a radius of about 200 km, which is about twice the 3GPP standard, transmits a RACH signal 423 delayed by a delay of a downlink channel .

In this case, the receiving end receives the RACH signal 425 delayed by a predetermined time 431 with respect to the time point of transmitting the signal through the downlink channel.

When the receiving end detects the RACH signal 425 by selecting the interval of the first detection time interval 413, the receiving end detects the deteriorated RACH signal 425 due to loss of sample data in the first detection time interval 413 Can be detected. That is, there may be ambiguity as long as the length of the preamble sequence (24567Ts = 1536Ta = 0.8msec), which may make it difficult for the receiving end to estimate the time offset. For example, it may be difficult to distinguish between a transmitter located at a distance of about 80 km from the receiver and a transmitter located at a distance of about 200 km from the receiver to an estimated time offset value.

However, when the receiving end selects the second detection time interval 415 and detects the RACH signal, the detection of the preamble sequence from the receiving end to the transmitting end, which is about 200 km away, and the detection of the time offset Can be estimated.

In other words, the transmitting end needs to transmit the RACH signal without changing the standard or configuration. The receiving end detects the time offset from the RACH signal of the detection interval by selecting the RACH signal with different detection intervals, It is possible to detect the sequence and estimate the time offset.

On the other hand, in this case, by performing detection twice for the same RACH signal, it is possible to determine whether the receiving end that has transmitted the RACH signal from the detection result is located within a near-field radius of 0 km to about 100 km or within a far- Additional blocks may be required to determine.

If the first and second time offsets are detected in different detection intervals for the same RACH signal, the receiving end can determine a correction time value for correcting the data transmission time of the transmitter based on the first and second time offsets have. As described above with reference to FIG. 3, the receiving end can transmit a TA command including a correction time value to the RAR signal, which is a random access response signal, to the transmitting terminal (terminal). The transmitting terminal that has received the RAR signal can establish synchronization of the uplink channel by transmitting data through the uplink channel after pulling the transmission point forward by the correction time value.

5 is a block diagram of a RACH signal detection unit of a receiving end supporting ranging ranging of a wide cell radius according to an embodiment of the present invention.

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

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

5, the receiver 500 includes an RF processor 502, an A / D converter (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 S / P converter 510-1 and a second S / At least one first fast Fourier transform operator 512-1 and at least one second FFT operator 512-2, a first ranging frequency demapper ) 514-1 and a second ranging frequency shifter 514-2, a preamble sequence generator 516, a first code demodulator 518-1 and a second code demodulator 518-2 A first IFFT 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 and a second time offset detector 524-2, Set determiner 526 may be configured by, and the like.

Referring to FIG. 5, the RF processor 502 includes a filter, a frequency converter, and the like. The RF processor 502 converts a radio frequency (RF) band signal received through a receive antenna into a baseband 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 interval 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 of the selected time interval, and outputs the CP interval.

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

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

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

Each of the first sequence demodulator 518-1 and the second sequence demodulator 518-2 includes a first ranging frequency shifter 514-1 and a second ranging frequency shifter 514-2 and a preamble sequence And performs a sequence demodulation by multiplying the preamble sequence from the generator 516 to generate correlation data corresponding to 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 the peak power or the normalized signal to noise ratio (SNR) in the correlation data. That is, the first signal intensity detector 522-1 and the second signal strength detector 522-2 are configured to detect the first signal intensity of the RACH signal and the second signal intensity of the RACH signal in the first detection time interval and the second detection time interval, The signal strength is detected.

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 detects a first time, which 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.

The time offset determiner 526 uses the signal strength and the time offset value detected in the first detection time interval, the signal intensity value and the time offset value detected in the second detection time interval to calculate the data of the transmitter corresponding to the RACH signal The correction time value for adjustment of the transmission time point can be determined.

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

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

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

Referring to FIG. 6, the range to be detected by the receiving end 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 interval is 0 to 1536 TA .

6 (a) shows the first detection time interval 621 and the time offset estimated in the time interval in square brackets " [] ".

In this case, the starting point of the first detection time interval 621 may be located at a point of time delayed from the starting point of the subframe by considering 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 the cyclic prefix (CP) according to the RACH preamble format 3 capable of supporting the cell radius up to about 100 km, for example.

6 (b) shows the second detection time interval 623 and the time offset estimated in the time interval in square brackets " [] ".

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

For example, when detecting the RACH signal of the near terminal of 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 1282 TA, Can be estimated as a time offset value. On the other hand, when detecting the RACH signal of the near terminal 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 to be a value between 254TA and 1536TA . That is, an offset may occur in the detected value.

That is, the time offset of the RACH signal 601 received at the terminal adjacent to the base station can be 0TA with respect to the first detection time interval 621 of FIG. 6 (a) The time offset of the RACH signal 603 received at the terminal may be a value between 0 TA and 1282 TA. 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 1282 and 1536 TA.

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

Accordingly, the time offset of the RACH signal 613 received by the near terminal within the cell radius of about 100 km can be estimated to be a value between 254TA and 1536TA, with respect to the second detection time interval 623 of FIG. 6B 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 can be estimated to be a value between 0 TA and 254 TA. In addition, the time offset of the RACH signal 617 received by the remote terminal within a cell radius of about 120 km to 200 km can be estimated to be a value between 254TA and 1282TA.

Meanwhile, in FIG. 6 (a), only a part of the RACH signal exists in the interval exceeding 1536 TA, so that ambiguity of the time offset detection value can be generated.

6, in the first detection time interval 621 and the second detection time interval 623, the signal strength of each of the RACH signals can be detected. For example, if 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) Respectively.

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

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

Accordingly, based on the time offset and the signal strength detected in each of the first detection time interval 621 and the second detection time interval 623, the receiving end (base station) transmits the RACH signal to the transmitter (terminal) It can be determined whether the terminal is located or a terminal located at a remote location.

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

Referring to FIG. 7, in step 701, a receiving end (for example, a base station) can 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 can convert the time offset detected in the second detection time interval to (time offset + 1282TA) mod1536TA.

In step 705, the receiving end can determine in which interval the time offset is detected.

As a result of the determination in step 705, if no RACH signal is detected in all the intervals of the first detection time interval and the second detection time interval, the receiving end can determine that the detection of the time offset has failed in step 707. [

Meanwhile, if the RACH signal is detected in only one of the two periods of the first detection time interval and the second detection time interval, the receiving end can 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, the receiving end 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 smaller than the 1282TA value, the receiving end can determine whether the detected time offset is detected in the first detection time interval.

If it is determined in step 711 that the detected time offset is detected in the first detection time interval, the receiving end may adopt the time offset value detected in the first detection time interval.

On the other hand, if it is determined in step 711 that the detected time offset is detected in the second detection time interval, the receiving end adopts a value obtained by adding 1282TA and the time offset value detected in the second detection time interval .

If it is determined in step 705 that the time offset is detected in both the first detection time interval and the second detection time interval, the receiving end determines whether the detected time offset value is greater than the 1282TA value can do.

If it is determined in step 717 that the detected time offset value is greater than the 1282TA value, 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, the receiving end can compare the RACH signal intensity in the first detection time interval and the RACH signal intensity in the second detection time interval with each other have.

As a result of the comparison in step 719, the receiving end may determine in step 721 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 adding 1282TA and the time offset value detected in the second detection time interval have.

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

Through the procedure of FIG. 7, the receiving end can estimate the adopted time offset value as a time offset value corresponding to the RACH signal.

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

On the other hand, the range of providing the TA value (time advance) to the transmitting end through the RAR according to the 3GPP standard is limited to 1282TA (= 20512Ts), which may be insufficient to cover a cell radius of about 100km or more. To solve this problem, the range of the TA value defined in the 3GPP standard can be adjusted to be larger.

Alternatively, without changing the existing standard, the receiving terminal (base station) divides the short distance transmitting terminal (terminal) located at a short distance and the long distance transmitting terminal (terminal) located at a long distance and transmits the TA value, improves the scheduler and modem, . Hereinafter, three embodiments for supporting the wide area cell by improving the scheduler and the modem will be described. However, it is needless to say that the wide area cell can be supported by more various implementations.

In a first embodiment, a receiving end (for example, a base station) can support a wide area cell over about 100 km by extending the modem receiving part.

The receiving end detects the time delay of each transmitting end, which is the distance to each transmitting end (for example, a terminal), by performing the detection of the RACH signal, and transmits the near end transmitting end located at a distance of about 100 km or less, And the remote transmitters located at the respective locations are separated.

For example, the receiving end may transmit a correction time value determined to be a reference to the OTA value as the uplink synchronization position to the transmitting terminals located in the vicinity.

On the other hand, the receiver can transmit a correction time value determined to be a reference value of 1282TA (= 66.6 usec) delayed by a predetermined time as an uplink synchronization position to terminals located at a remote location. In this case, the correction time value TA 'may be a value obtained by subtracting 1282TA from the time offset value estimated as TA' = measured TA - 1282TA. In other words, the correction time value may be a value determined to transmit the data with a certain time delay in the uplink synchronization position by the transmitter in consideration of the RTD time.

Accordingly, the receiver can receive the data on the basis of the subframe boundary at the time of 0TA and the subframe boundary at the time of offsetting by 1282TA time when receiving data through the uplink channel.

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

FIG. 8 is a flowchart illustrating a method for supporting uplink synchronization of a wide cell radius according to an exemplary embodiment of the present invention. Referring to FIG.

Referring to FIG. 8, according to the first embodiment, the receiving end can support the uplink synchronization of the wide cell radius by extending the modem receiving unit.

The receiving end can determine the correction time value for adjustment of the data transmission time of the transmitting end of the wireless communication system by using the time offset value estimated in Fig.

First, in step 801, the receiving end can determine whether the estimated time offset from the RACH signal is 1282TA or more.

If the time offset estimated from the RACH signal is less than or equal to the 1282TA value, the receiving end adds a TA command including the estimated time offset value as the correction time value to the RAR signal, .

In step 805, the receiver can perform demodulation by synchronizing the data on the uplink SCH channel received from the transmitter with the OTA time of the UL subframe boundary.

On the other hand, if it is determined in step 801 that the estimated time offset is greater than the 1282TA value, the receiving terminal adds a TA command including a value obtained by subtracting 1282TA from the estimated time offset to the RAR signal, .

In step 809, the receiving end can perform demodulation in synchronization with the chan- nel link sub-frame boundary + 1282TA offset at the time of data detection through the uplink SCH channel received from the transmitting end.

After step 805 or 809, in step 811, the receiving end may determine whether to perform time offset management for each transmitting end.

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

On the other hand, if the UE does not perform the time offset management, the receiving end determines that the data passed the cyclic redundancy check (CRC) is normal and performs MAC processing in step 815.

In the second embodiment, there is a method of changing a scheduler to support a wide area cell of about 100 km or more.

The receiving end can perform scheduling so that a problem of muxing between subframes at the time of processing with the same TTI is avoided by dividing the transmitting terminal located at a near location and the transmitting terminal located at a remote location by transmission time interval (TTI).

As described above, the receiving end can transmit the TA command to the transmitting end by setting the TA command as a shrink-link synchronization position so as to be classified based on the time 0TA and the time 1282TA.

Next, the receiver processes the uplink channel of the transmitter located in the near position as an allocation to the n-th TTI, which is the original position as in the legacy processing, and the transmitter located at the far position processes n It can be processed as being assigned to the +1 TTI.

As described above, in the case of scheduling, the complexity of the receiving end does not increase since the modem receiving unit performs only one process as compared with the case where the modem receiving unit demodulates twice the same data in the first embodiment.

On the other hand, since the uplink subframe boundary, which is the operating point of the modem, must be changed for each TTI, it may be required to adjust the buffering by a predetermined time offset in each TTI in the pre-processing block for providing uplink data.

9 is a diagram illustrating another example of a flowchart 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 chanel link synchronization of a wide cell radius using an enhanced transmission time interval (TTI) scheduler.

First, in step 901, the receiving end can determine whether the estimated time offset from the RACH signal is 1282TA or more.

If the estimated time offset is less than or equal to the 1282TA value, the receiving terminal adds the TA command including the estimated time offset value as the correction time value to the RAR signal and provides the TA command to the transmitter (e.g., terminal) can do.

In step 905, the receiver may allocate the data on the uplink received from the transmitter located in the vicinity to the demodulation of the nth subframe.

Thereafter, in step 907, the receiving end can perform the demodulation of the n-th 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 1282TA value, the receiving end adds a TA command including a value obtained by subtracting the 1282TA value from the estimated time offset to the RAR signal, .

In step 911, the receiving end can allocate the data on the uplink received from the transmitter located in the vicinity to the demodulation of the (n + 1) th subframe, and process the data.

Thereafter, in step 913, the receiving end can advance the demodulation of the (n + 1) th subframe by a value obtained by subtracting the value 254TA from the uplink synchronization time point.

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

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

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

In this case, the receiving end can distinguish between the transmitting end located at a nearby location and the transmitting end located at a remote location through the detection of the RACH signal, allocating the local transmitting end to the PCell, and the remote transmitting end to the SCell. That is, the PCell group can operate in synchronization with the downlink and the uplink based on 0TA, and the SCell group can operate in synchronization with the downlink and uplink based on the 1282TA. Thus, it is possible to operate without changing the PHY (physical layer) stage.

On the other hand, synchronizing operation between the downlink and the uplink means that when the receiving terminal processes the data in the PHY stage, the downlink transmits data by 1282 TA earlier than the uplink, so that the transmitting terminal located at a remote location performs downlink synchronization And the uplink data is received based on 0TA at the receiving end when the uplink data is transmitted immediately. This can have the effect of pulling a far-lying transmitting station located at a cell radius of about 100 km or more to the base station by about 100 km.

10 is a flowchart illustrating a method for supporting uplink synchronization of a wide cell radius according to an exemplary embodiment of the present invention. Referring to FIG.

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

First, in step 1001, the receiving end can determine whether the estimated time offset from the RACH signal is 1282TA or more.

If the estimated time offset is less than or equal to the 1282TA value, the receiving end adds the TA command including the estimated time offset value as the correction time value to the RAR signal, and provides the TA command to the transmitting terminal located in the vicinity.

In step 1005, the receiving end can schedule the transmitting end located at a short distance to a carrier to which the PCell belongs.

Next, in step 1007, the modem processing the carrier of the receiving end can process the carrier by synchronizing the synchronization timing between the downlink and the uplink based on the OTA.

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

Next, in step 1011, the receiving end may schedule a long distance transmitter having a time offset of 1282TA or more to 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 synchronization point of the downlink for a predetermined time (for example, 1282TA) with respect to the synchronization point of the uplink.

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

11, a receiving end (e.g., a base station) may include a time interval selector 506, a time offset detector 524 and a time offset determiner 526, and so on.

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 in FIG. 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 estimator 526 may correspond to the time offset detector 524-1 of FIG. The time offset determiner 526 of FIG.

According to various embodiments, the time interval selector 506 may select a first detection time interval and a second detection time interval in a RACH signal including a RACH preamble sequence, for a ranging access. Next, the time offset detector 524 can detect the first time offset and the second time offset, which are reception timings of the preamble sequence in each of the selected first detection time interval and the second detection time interval. 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. At this time, the RACH signal may include a cyclic prefix (CP) interval, a RACH preamble sequence interval, and a guard interval GT interval.

According to various embodiments, the receiving end may further comprise 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 in Fig. In this case, the signal strength detector can detect the first signal strength and the second signal strength in each of the first detection time interval and the second detection time interval. Based on the detected first time offset, the second time offset, the first signal strength, and the second signal strength, the time offset determiner 526 calculates the time offset of the data transmission time point of the transmitter of the wireless communication system The correction time value for adjustment can be determined.

According to various embodiments, the starting point of the first detection time interval may be delayed for a certain time at the starting point of the subframe in consideration of the round trip delay (RTD) time between the receiving end and the transmitting end.

According to various embodiments, the starting point of the second detection time interval may be delayed for a certain time at the start point of the first detection time interval, taking into account the round trip delay (RTD) time between the receiving end and the transmitting end.

According to various embodiments, the time offset determiner 526 may estimate a time offset value that takes into account the RTD time, based on the detected first and second time offsets. The time offset determiner 526 can use the estimated time offset value to determine a correction time value for correcting the data transmission time of the transmitter. 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 certain time delay at the uplink synchronization position with the transmitter in consideration of the RTD time, when the transmitter is located at a distance radius from the receiver. In this case, the far-off radius is a distance of about 100 km or more from the receiving end, and the predetermined time may be about 1282 TA.

According to various embodiments, the receiving end may further include a transmitting unit for transmitting a random access response (RAR) signal, which is a response signal to the RACH signal, with a correction time value.

12 is a flowchart illustrating a method of determining a correction time in 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 can select a first detection time interval and a second detection time interval in the RACH signal including the RACH preamble sequence.

In this case, the start point of the first detection time interval may be delayed for a certain time at the starting point of the subframe in consideration of the RTD time between the receiving end and the transmitting end. Also, the start point of the second detection time interval may be delayed for a predetermined time at the start point of the first detection time interval in consideration of the RTD time between the receiving end and the transmitting end.

Next, in step 1203, the receiving end may detect a first time offset and a second time offset, which are reception timings of the preamble sequence in each of the selected first detection time interval and the second detection time interval.

In operation 1205, the receiving end can 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 a first signal strength and a 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 may be 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 transmitter of the wireless communication system The correction time value can be determined.

According to various embodiments, the operation of determining the correction time value may include estimating a time offset value that considers 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 the correction time value for correcting the data transmission timing of the transmitting end. In this case, when estimating the time offset value, the second time offset can be estimated by converting the RTD time into the modulo value.

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

According to various embodiments, if a correction time value for correcting the data transmission time is determined, the correction time value may be included in the RAR signal, which is a response signal to the RACH signal.

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

In the present invention, a method of estimating a time offset of a preamble sequence transmitted from a transmitter located at a wide cell radius of about 100 km or more and a method for synchronizing uplinks are proposed. In the meantime, in the embodiments of the present invention, detailed operation or modification is not described in order to facilitate understanding, but a method of estimating a time offset and using the uplink to synchronize the uplink may be implemented by various methods May be possible.

In addition, the embodiments of the present invention are not limited to the 3GPP LTE system but can be applied 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, the embodiments of the present invention are also applicable to wireless communication systems such as eMTC, NB-IoT, V2X, and the like.

At least a portion of the receiving end (e.g., modules or functions thereof) or method (e.g., operations) of the present disclosure in accordance with one embodiment may be stored in a computer readable non- -transitory computer readable media). When an instruction is executed by a processor, the processor may perform a function corresponding to the instruction.

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

Non-volatile storage medium refers to a medium that semi-permanently stores data and is capable of being read by the apparatus. In addition, volatile or nonvolatile (nonvolatile) storage medium for temporarily storing data for calculation or transmission such as a register, Memory. On the other hand, temporal transmission media such as signals, currents, etc., do not correspond to non-transitory recording media.

Specifically, the above-described programs may be stored and provided on a non-volatile readable recording medium such as a CD, a DVD, a hard disk, a Blu-ray disc, a USB, an internal memory of the apparatus of this disclosure, a memory card, ROM or RAM,

In addition, the above-described programs may be stored in the memory of the server and transmitted for sale to a terminal (e.g., a device of the present invention) connected to a network with a server, or may be transmitted to a provider of the program (e.g., Or may be transferred or registered to the server by the server.

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

According to one embodiment, the computer-readable non-transitory recording medium further comprises: selecting a first detection time interval and a second detection time interval in a RACH signal including a RACH preamble sequence for ranging access; Detecting a first time offset and a second time offset, which are reception times of the preamble sequence in each of the first detection time interval and the second detection time interval, and detecting, based on the detected first time offset and the second time offset, And a program for causing a receiving end of the present disclosure to perform an operation of determining a correction time value for correcting a data transmission time point of a transmitting end of the wireless communication system.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

506: Time interval selector 524: Time offset detector
526: Time offset determination

Claims (20)

A receiving apparatus of a wireless communication system,
A signal interval selector for selecting a first detection time interval and a second detection time interval in a RACH signal including a random access channel (RACH) preamble sequence for a ranging access;
A time offset detector for detecting a first time offset and a second time offset, which are reception time points of the preamble sequence in each of the selected first detection time interval and the second detection time interval; And
A time offset determiner for determining a correction time value for correcting the data transmission time point of the transmitting apparatus of the wireless communication system based on the detected first time offset and the second time offset,
.
The method according to claim 1,
The receiving apparatus includes:
Further comprising a signal strength detector for detecting a first signal strength and a second signal strength in each of the first detection time interval and the second detection time interval,
Wherein the time offset determiner comprises:
Determines a correction time value for adjustment of a data transmission time point of the transmitting apparatus of the wireless communication system based on the detected first time offset, the second time offset, the first signal strength, and the second signal strength And the reception device.
The method according to claim 1,
Wherein the start point of the first detection time interval
Wherein a time delay is delayed from a start point of a subframe in consideration of a round trip delay (RTD) time between the receiving apparatus and the transmitting apparatus.
The method according to claim 1,
Wherein the start point of the second detection time interval
Wherein the delay time is delayed by a predetermined time at a start point of the first detection time interval in consideration of a round trip delay (RTD) time between the reception device and the transmission device.
The method according to claim 1,
Wherein the time offset determiner comprises:
Estimating a time offset value considering a round trip delay (RTD) time based on the detected first time offset and the second time offset,
And determines a correction time value for correcting the data transmission time of the transmitting apparatus by using the estimated time offset value.
6. The method of claim 5,
Wherein the time offset determiner comprises:
In estimating the time offset value,
And converts the second time offset into a modulo value in consideration of the RTD time.
The method according to claim 1,
Wherein the correction time value is calculated by:
When the transmitting apparatus is located outside a predetermined radius from the receiving apparatus,
Is a value determined to transmit data at a predetermined time delay in an uplink synchronization position with the transmission apparatus in consideration of the RTD time.
8. The method of claim 7,
The predetermined radius may be,
A distance of 100 km from the receiving apparatus,
Wherein the predetermined time is a value of 1282TA.
The method according to claim 1,
The receiving apparatus includes:
(RAR) signal, which is a response signal to the RACH signal,
Further comprising: a receiving unit for receiving a signal from the receiving apparatus;
The method according to claim 1,
The RACH signal,
A cyclic prefix (CP) period, a RACH preamble sequence period, and a GT interval that is an interference prevention interval with respect to a next subframe.
A method for determining a correction time in a receiving apparatus of a wireless communication system,
Selecting a first detection time interval and a second detection time interval in a RACH signal including a random access channel (RACH) preamble sequence for ranging access;
Detecting a first time offset and a second time offset, which are reception timings of the preamble sequence in each of the selected first detection time interval and the second detection time interval; And
Determining a correction time value for correction of a data transmission time point of the transmitting apparatus of the wireless communication system based on the detected first time offset and the second time offset;
≪ / RTI >
12. The method of claim 11,
The method comprises:
Further comprising detecting a first signal strength and a second signal strength in each of the first detection time interval and the second detection time interval,
Wherein the determining the correction time value comprises:
Determines a correction time value for adjustment of a data transmission time point of the transmitting apparatus of the wireless communication system based on the detected first time offset, the second time offset, the first signal strength, and the second signal strength Step
≪ / RTI >
12. The method of claim 11,
Wherein the start point of the first detection time interval
(RTD) time between the receiving apparatus and the transmitting apparatus is considered to be delayed by a predetermined time at a starting point of the subframe.
12. The method of claim 11,
Wherein the start point of the second detection time interval
Wherein the delay time is delayed by a predetermined time at a start point of the first detection time interval in consideration of a round trip delay (RTD) time between the reception apparatus and the transmission apparatus.
12. The method of claim 11,
Wherein the determining the correction time value comprises:
Estimating a time offset value considering a round trip delay (RTD) time based on the detected first time offset and the second time offset,
And using the estimated time offset value to determine a correction time value for correcting the data transmission time of the transmitting apparatus.
The method of claim 15,
Wherein the step of estimating the time offset value comprises:
And converting the second time offset into a modulo value in consideration of the round trip delay (RTD) time.
12. The method of claim 11,
Wherein the correction time value is calculated by:
When the transmitting apparatus is located outside a predetermined radius from the receiving apparatus,
Is a value determined to transmit data at a predetermined time delay in an uplink synchronization position with the transmission apparatus in consideration of the RTD length
≪ / RTI >
18. The method of claim 17,
The predetermined radius may be,
A distance of 100 km from the receiving apparatus,
Wherein the predetermined time is a value of 1282TA.
12. The method of claim 11,
The method comprises:
Transmitting the random access response (RAR) signal, which is a response signal to the RACH signal, including the correction time value
≪ / RTI >
12. The method of claim 11,
The RACH signal,
A cyclic prefix (CP) period, a RACH preamble sequence period, and a GT interval that is an interference prevention interval with respect to a next subframe.

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