KR101793731B1 - Basestation for performing synchronization based on signal and operating method thereof - Google Patents

Basestation for performing synchronization based on signal and operating method thereof Download PDF

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Publication number
KR101793731B1
KR101793731B1 KR1020160052307A KR20160052307A KR101793731B1 KR 101793731 B1 KR101793731 B1 KR 101793731B1 KR 1020160052307 A KR1020160052307 A KR 1020160052307A KR 20160052307 A KR20160052307 A KR 20160052307A KR 101793731 B1 KR101793731 B1 KR 101793731B1
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South Korea
Prior art keywords
base station
frequency error
signal
dac value
dac
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KR1020160052307A
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Korean (ko)
Inventor
이지훈
이석기
정종대
이강민
이도훈
이경수
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(주)주니코리아
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Priority to KR1020160052307A priority Critical patent/KR101793731B1/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/001Synchronization between nodes
    • H04W56/0015Synchronization between nodes one node acting as a reference for the others
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/0035Synchronisation arrangements detecting errors in frequency or phase
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices

Abstract

The present invention relates to a base station and an operation method thereof. According to the first aspect of the present invention, a base station according to an embodiment of the present invention includes a communication part for receiving a signal from another base station, and a control part for obtaining a first frequency error for the base station which transmits the signal and correcting the first frequency error by changing a DAC value according to a predetermined criterion. So, it is possible to efficiently correct the frequency error.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a base station for performing synchronization based on a signal,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station that performs synchronization based on a signal and an operation method thereof. And more particularly, to a base station operating on the basis of a signal from another base station and an operation method thereof.

A base station used in a wireless communication system, for example, an LTE mobile communication system, should be synchronized in some cases.

When the base station is located outdoors, the base station can perform synchronization using the GPS signal. However, when the base station is located in a building or the like, there is a problem that the GPS signal can not be received depending on the location of the base station.

To solve this problem, a method using IEEE 1588 or a method of performing synchronization by receiving a synchronization signal from another base station (air sync, Air Sync) is used. A related art related to this is Korean Patent Laid-Open No. 10-2012-0030753.

Meanwhile, the base station may perform frequency error correction to improve quality of a received signal and to avoid interference between adjacent base stations. The frequency error refers to an error between the transmission frequency of the transmitter and the reception frequency of the receiver, and is generally caused by the physical characteristics of a device (for example, an oscillator) included in the base station.

As an example of a method for correcting the frequency error, there is a method of changing the DAC (Digital-Analog-Converter) value and correcting the frequency error based on the changed DAC value.

In the case of a device included in a base station, the physical characteristics may be changed due to the use temperature or aging. Therefore, the DAC value must be adjusted accordingly to correct the frequency error to a value suitable for the operation of the base station. Also, when the communicating base station is changed, the DAC value must also be adjusted accordingly to correct the frequency error to a value suitable for the operation of the base station.

Such a change in the physical characteristics of the base station may be more problematic in the case of an air sink system that performs synchronization by receiving a synchronization signal from another base station. In performing synchronization, a base station may perform communication with other base stations with different physical characteristics, and the base station may perform synchronization based on synchronization signals of different base stations.

Therefore, in recent years, there has been a demand for an apparatus and a method capable of correcting a frequency by selecting a base station based on the synchronization of the base station and changing the DAC value in accordance with the characteristics of the selected base station .

On the other hand, the background art described above is technical information acquired by the inventor for the derivation of the present invention or obtained in the derivation process of the present invention, and can not necessarily be a known technology disclosed to the general public before the application of the present invention .

The present invention provides a base station for performing synchronization based on a signal of the present invention and an operation method thereof.

According to a first aspect of the present invention, a base station according to an embodiment of the present invention includes a communication unit for receiving a signal from another base station, and a communication unit for transmitting And a controller for obtaining a first frequency error for the base station and correcting the first frequency error by changing a DAC value according to a predetermined criterion.

According to a second aspect of the present invention, a method of operating a base station according to an embodiment of the present invention includes receiving a signal from another base station, and acquiring a first frequency error for a base station that transmitted the signal, based on the signal And correcting the first frequency error by changing a DAC value according to a predetermined criterion.

According to one of the above-mentioned objects of the present invention, an embodiment of the present invention can provide a base station that performs synchronization based on a signal and an operation method thereof.

Further, according to any one of the tasks of the present invention, the DAC value is adjusted based on the DAC change rate calculated based on the signal received from the other base station, so that the adjustment of the DAC value This is possible.

Further, according to any one of the tasks of the present invention, the DAC value can be adjusted in accordance with the change of the base station that is based on the synchronization, so that the frequency error can be efficiently corrected.

Further, according to any one of the tasks of the present invention, synchronization can be efficiently performed by changing the base station based on synchronization based on whether synchronization signals are received or not.

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

1 is a block diagram schematically showing a network system according to an embodiment of the present invention.
2 is a block diagram schematically showing each configuration of a first base station according to an embodiment of the present invention.
3 and 4 are flowcharts for explaining a method of operating a base station according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically showing a network system according to an embodiment of the present invention.

As shown in FIG. 1, a network system according to an embodiment of the present invention includes at least one base station 100, 200.

For convenience of description, the first base station 100 will be described below. The second base station 200 is a base station that transmits a synchronization signal and the first base station 100 is a base station that receives a synchronization signal transmitted from the second base station 200 and performs synchronization.

The first base station 100 according to the embodiment of the present invention can perform synchronization in an air synchronization method. Specifically, the first base station 100 may receive a synchronization signal from the specific base station 200 of another neighboring second base station 200 and perform synchronization. According to an embodiment of the present invention, the first base station 100 may receive a synchronization signal including time synchronization data from the second base station 200, and may perform time synchronization based on the received synchronization signal.

The second base station 200 according to the embodiment of the present invention can transmit a signal including predetermined data and the first base station 100 can detect a signal transmitted from the second base station 200. [ Meanwhile, the first base station 100 may acquire predetermined information from the signal of the second base station 200. For example, the first base station 100 may obtain the transmission frequency of the second base station 200 from the signal of the second base station 200. [

Meanwhile, the first base station 100 may acquire a frequency error value for the second base station 200, which is a basic base station that emits a received signal, that is, a base of a signal received by the first base station 100. [ The first base station 100 transmits a difference between the transmission frequency of the transmitting terminal of the second base station 200 that has transmitted the signal and the receiving frequency of the receiving terminal of the first base station 100 that receives the transmitted signal to the second base station 200 And may be calculated and obtained by using the frequency error for the base station 200. [

Also, the first base station 100 according to the embodiment of the present invention can adjust the obtained frequency error. The first base station 100 may adjust the frequency error by adjusting the DAC value. The DAC value may be a correction value used when changing an analog signal frequency to a digital signal.

When the DAC value is adjusted, the configuration (e.g., the oscillator) of the receiving end of the first base station 100 is operated based on the adjusted DAC value, whereby the receiving frequency of the first base station 100 may be changed . On the other hand, since the frequency error is a difference between the transmission frequency and the reception frequency, the frequency error is also changed when the reception frequency is changed. The present invention can change the frequency error by changing the DAC value in this manner.

Next, with reference to FIG. 2, each configuration of the first base station 100 according to the embodiment of the present invention will be described.

2 is a block diagram schematically showing each configuration of a first base station 100 according to an embodiment of the present invention.

The first base station 100 according to an embodiment of the present invention includes a communication unit 110 for transmitting and receiving signals to and from another base station 200. The communication unit 110 may include a reception unit and a transmission unit that perform reception and transmission according to their roles. The receiving unit and the transmitting unit may be disposed separately from each other, or may be disposed together.

The first base station 100 according to the embodiment of the present invention may further include a controller 120 that performs overall control of the operation of the first base station 100.

The controller 120 according to the embodiment of the present invention can acquire a frequency error based on the received signal. Specifically, the control unit 120 may calculate the difference between the transmission frequency and the reception frequency of the received signal as a frequency error with respect to the base station 200 that transmitted the received signal.

Meanwhile, the control unit 120 may perform synchronization based on the synchronization signal received by the base station 200. [

Meanwhile, the controller 120 may change the DAC value according to a predetermined criterion. The controller 120 according to the embodiment of the present invention can change the DAC value when the obtained frequency error exceeds a predetermined range.

The control unit 120 according to the embodiment of the present invention may change the DAC value based on the DAC change rate. More specifically, the control unit 120 may change the DAC value based on the average DAC change rate. If the DAC value is changed, the control unit 120 may communicate with the base station 200 based on the changed DAC value.

Meanwhile, the controller 120 may adjust the DAC value according to a predetermined criterion, and may reacquire the frequency error. The DAC value change rate may also be calculated based on the re-acquired frequency error and the adjusted DAC value. At this time, the controller 120 may adjust the DAC value at least once to obtain the respective frequency errors. It is also possible to calculate the average of the rate of change of each DAC value based on each reacquired frequency error.

At this time, the controller 120 may increase or decrease a predetermined value from the current DAC value in adjusting the DAC value. The control unit 120 may re-acquire the frequency error based on the DAC value that increases the predetermined value from the current DAC value, and may calculate the frequency error based on the DAC value that is decreased from the current DAC value by a predetermined value It can also be obtained. Thereafter, the DAC value change rate may be calculated based on each re-acquired frequency error, or the average DAC value change rate which is an average of the DAC value change rates may be calculated. Meanwhile, the controller 120 may determine the value obtained by multiplying the frequency error before the DAC value is adjusted by the average DAC rate as the DAC value to be changed.

For example, if the current DAC value is 0, the controller 120 may adjust the DAC value to 1000 to obtain the frequency error. At this time, when the re-acquired frequency error is 3, the controller 120 can calculate the change rate of the DAC value as 1000/3.

Also, the controller 120 may adjust the DAC value to -1000 to obtain the frequency error. In this case, when the re-acquired frequency error is -4, the controller 120 can calculate the change rate of the DAC value as 1000/4.

At this time, the controller 120 may calculate an average of 1000/3 and 1000/4 as the average DAC value change rate.

Then, the control unit 120 can change the DAC value by multiplying the frequency error when the DAC value is 0 and the average DAC value change rate.

According to the embodiment of the present invention, since the frequency error is corrected at least once by adjusting the DAC value, the DAC value is reflected by reflecting the reacquired result, and the frequency error is corrected based on the changed DAC value, It is possible to correct the frequency error efficiently in accordance with the characteristics of the base station 200 performing the above-described operation.

Meanwhile, when the DAC value is changed, the control unit 120 may reacquire the frequency error based on the changed DAC value. According to an embodiment of the present invention, when the re-acquired frequency error exceeds the predetermined range again, the control unit 120 may change the base station 200 to another base station.

On the other hand, if the obtained frequency error is within a predetermined range, the control unit 120 can perform synchronization with the base station 200. At this time, the base station 200 may perform synchronization based on the synchronization signal transmitted from the base station 200.

The control unit 120 may receive the synchronization signal from the base station 200 at least once. The synchronization signal may be received at a predetermined time or may be received at predetermined intervals. The control unit 120 may perform synchronization based on the synchronization signal continuously received.

If the synchronization signal is not received at a predetermined time, the control unit 120 may determine that the current base station 200 is out of sync. In this case, the control unit 120 may perform synchronization with another base station 200 except for the current base station 200.

Specifically, the control unit 120 may generate a list of at least one neighboring base station 200. At this time, the number of base stations 200 included in the list may be set in advance. The control unit 120 may also generate a list of the base stations 200 on which the signals are received.

The control unit 120 can select the base station 200 as a base station that transmits the strongest signal among the base stations 200 included in the list and the controller 120 performs synchronization with the selected base station 200 It is possible.

If the synchronization signal is not received from the current base station 200 at a predetermined time, the controller 120 removes the current base station 200 from the list and selects the base station 200 as the base station 200 that transmits the strongest signal It is possible. Then, the control unit 120 may perform synchronization based on the synchronization signal received from the selected base station 200 again.

The first base station 100 according to an exemplary embodiment of the present invention may further include a storage unit 130 for storing data to be transmitted and received. According to an embodiment of the present invention, the storage unit 130 may store a program or an algorithm for the operation of the first base station 100. In addition, formulas or algorithms for calculating various numerical values may be stored. The control unit 120 may transmit data stored in the storage unit 130 to another base station 200 according to an embodiment of the present invention. The control unit 120 may also calculate various values based on the data stored in the storage unit 130. [

Next, a method of operating a base station according to an embodiment of the present invention will be described with reference to FIGs. 3 and 4. FIG.

3 and 4 are flowcharts for explaining a method of operating a base station according to an embodiment of the present invention.

The method of operation of the base station according to the embodiment shown in FIGS. 3 and 4 includes the steps of the first base station 100 shown in FIG. 2 being processed in a time-series manner. Therefore, the contents described above with respect to the first base station 100 shown in FIG. 2 can be applied to the operation method of the base station according to the embodiment shown in FIG. 3 and FIG.

The first base station 100 according to the embodiment of the present invention generates a list of other base stations 200 from which signals are received (S301). The first base station 100 may generate a list of base stations 200 on which signals are received according to predetermined criteria. For example, the first base station 100 may select a base station 200 corresponding to a predetermined number of base stations 200 from which a signal is received, and generate a list.

The first base station 100 may select the base station 200 that transmits the strongest signal among the base stations 200 included in the list to the base station 200 (S303).

The first base station 100 may obtain a frequency error for the selected base station 200 and may determine whether the obtained frequency error exceeds a predetermined range (S305).

The first base station 100 may change the DAC value if the frequency error exceeds a predetermined range (S307). The first base station 100 may then reacquire the frequency error for the selected base station 200 based on the modified DAC value.

The first base station 100 may change the DAC value according to a predetermined criterion. The first base station 100 according to the embodiment of the present invention may change the DAC value based on the DAC change rate. More specifically, the first base station 100 may change the DAC value based on the average DAC rate of change. When the DAC value is changed, the first base station 100 can correct the frequency error based on the changed DAC value.

Hereinafter, a DAC value changing method will be described with reference to FIG.

The first base station 100 adjusts the DAC value according to a predetermined criterion and can obtain the frequency error again (S401).

The first base station 100 may calculate the DAC value change rate based on the obtained frequency error and the adjusted DAC value again (S403). At this time, the first base station 100 may adjust the DAC value at least one time to obtain the respective frequency error. It is also possible to calculate the average of the rate of change of each DAC value based on each reacquired frequency error.

At this time, the first base station 100 may increase or decrease the current DAC value by a predetermined value in adjusting the DAC value. The first base station 100 may reacquire the frequency error based on the DAC value that increased the predetermined value from the current DAC value and may calculate the frequency error based on the DAC value that decreased the predetermined value from the current DAC value . ≪ / RTI > Each DAC value change rate may be calculated based on each re-acquired frequency error, or the average DAC value change rate, which is an average of the DAC value change rates, may be calculated.

The first base station 100 may determine a DAC value to be changed based on the calculated DAC value change rate (S405). The first base station 100 may determine the DAC value to be changed based on the average DAC value change rate.

Meanwhile, the first base station 100 may determine the value obtained by multiplying the frequency error and the average DAC change rate before the DAC value is adjusted as the DAC value to be changed. The first base station 100 may change the current DAC value to the determined DAC value.

According to the embodiment of the present invention, since the frequency error is corrected at least once by adjusting the DAC value, the DAC value is reflected by reflecting the reacquired result, and the frequency error is corrected based on the changed DAC value, It is possible to correct the frequency error efficiently in accordance with the characteristics of the base station 200 performing the base station 200. [

The operation of the base station will now be described with reference to FIG.

The first base station 100 may reacquire the frequency error based on the changed DAC value when the DAC value is changed. If the frequency error does not exceed the predetermined range as a result of the reacquisition, step S309 to be described below may be performed.

Meanwhile, according to an embodiment of the present invention, when the frequency error again exceeds a predetermined range as a result of reacquisition, the controller 120 may change the base station 200 to another base station.

If the first base station 100 does not exceed the predetermined range due to a frequency error, the first base station 100 may perform synchronization with the currently selected base station 200 (S309).

The first base station 100 may receive the synchronization signal from the base station 200 at least once. The synchronization signal may be received at a predetermined time or may be received at predetermined intervals. The first base station 100 may perform synchronization based on the continuously received synchronization signal.

Thereafter, the first base station 100 may determine whether a synchronization signal is received from the base station 200 at a predetermined time (S311).

If no synchronization signal is received at a predetermined time, the first base station 100 may delete the current base station 200 from the list (S313).

When the synchronization signal is periodically received, the first base station 100 may delete the current base station 200 from the list when the synchronization signal is not received at the time when the synchronization signal is received. Then, the first base station 100 may again select the base station 200 that transmits the strongest signal among the lists.

The first base station 100 may determine that the base station 200 is out of sync with the current base station 200 if a synchronization signal is not received at a predetermined time. In this case, the first base station 100 may perform synchronization with another base station 200 except for the current base station 200. To this end, the first base station 100 selects the base station 200 that transmits the strongest signal from the list, excluding the current base station 200, as a base station 200, Synchronization can be attempted on the basis of that.

According to the present invention, when the base station 200 serving as a basis of synchronization becomes an out-of-sync, the present invention can quickly cope with the out-of-sync.

The term " part " used in the present embodiment means a hardware component such as software or a field programmable gate array (FPGA) or an ASIC, and 'part' performs certain roles. However, 'part' is not meant to be limited to software or hardware. &Quot; to " may be configured to reside on an addressable storage medium and may be configured to play one or more processors. Thus, by way of example, 'parts' may refer to components such as software components, object-oriented software components, class components and task components, and processes, functions, , Subroutines, segments of program patent code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.

The functions provided within the components and components may be combined with a smaller number of components and components or separated from additional components and components.

In addition, the components and components may be implemented to play back one or more CPUs in a device or a secure multimedia card

The streaming method according to an embodiment of the present invention may also be implemented as a computer program (or a computer program product) including instructions executable by a computer. A computer program includes programmable machine instructions that are processed by a processor and can be implemented in a high-level programming language, an object-oriented programming language, an assembly language, or a machine language . The computer program may also be recorded on a computer readable recording medium of a type (e.g., memory, hard disk, magnetic / optical medium or solid-state drive).

Therefore, the proxy-based radio resource state prediction and traffic control method according to an embodiment of the present invention can be implemented by the computer program as described above being executed by the computing device. The computing device may include a processor, a memory, a storage device, a high-speed interface connected to the memory and a high-speed expansion port, and a low-speed interface connected to the low-speed bus and the storage device. Each of these components is connected to each other using a variety of buses and can be mounted on a common motherboard or mounted in any other suitable manner.

Where the processor may process instructions within the computing device, such as to display graphical information to provide a graphical user interface (GUI) on an external input, output device, such as a display connected to a high speed interface And commands stored in memory or storage devices. As another example, multiple processors and / or multiple busses may be used with multiple memory and memory types as appropriate. The processor may also be implemented as a chipset comprised of chips comprising multiple independent analog and / or digital processors.

The memory also stores information within the computing device. In one example, the memory may comprise volatile memory units or a collection thereof. In another example, the memory may be comprised of non-volatile memory units or a collection thereof. The memory may also be another type of computer readable medium such as, for example, a magnetic or optical disk.

And the storage device can provide a large amount of storage space to the computing device. The storage device may be a computer readable medium or a configuration including such a medium and may include, for example, devices in a SAN (Storage Area Network) or other configurations, and may be a floppy disk device, a hard disk device, Or a tape device, flash memory, or other similar semiconductor memory device or device array.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: first base station 110:
120: control unit 130:
200: Second base station

Claims (16)

  1. A communication unit for receiving a signal from another base station; And
    And a control unit for obtaining a first frequency error for the base station from which the signal is transmitted based on the signal and correcting the first frequency error by changing a DAC value according to a predetermined reference,
    Wherein,
    And changing the DAC value based on the DAC change rate when the first frequency error exceeds a predetermined range, adjusting each of the DAC values to a predetermined value increment and decrement value, respectively, And calculates a DAC value change rate, which is a respective adjusted DAC value for each second frequency error, based on each second frequency error, and calculates an average of the calculated DAC value change rates And changes the DAC value to a value obtained by multiplying the rate of change of the DAC value by the first frequency error.

  2. delete
  3. delete
  4. delete
  5. delete
  6. The method according to claim 1,
    Wherein the communication unit is in communication with at least one base station,
    Wherein,
    And generates a list for a predetermined base station among the base stations from which signals are received, and selects a base station that transmits the strongest signal from the list as the base station.
  7. The method according to claim 6,
    Wherein,
    Receiving a synchronization signal from the base station,
    Wherein,
    And performs synchronization based on the received synchronization signal.
  8. The method according to claim 6,
    Wherein,
    Receiving a synchronization signal from the base station at least once at a predetermined time,
    Wherein,
    And a base station to which a strongest signal is searched in the list is deleted based on a base station to which a strongest signal is searched, The base station selecting the base station.
  9. A method of operating a base station,
    Receiving a signal from another base station;
    Obtaining a first frequency offset for the base station from which the signal originated, based on the signal; And
    And correcting the first frequency error by changing a DAC value according to a predetermined criterion,
    The step of correcting the first frequency error by changing a DAC value according to a predetermined criterion includes:
    And changing the DAC value based on a DAC value change rate if the first frequency error exceeds a predetermined range,
    Wherein changing the DAC value comprises:
    Adjusting each of the DAC values to a predetermined value and decreasing a value to obtain a respective second frequency error for the base station;
    Calculating each DAC value change rate that is each adjusted DAC value for each second frequency error, based on each second frequency error; And
    And changing the DAC value to a value obtained by multiplying the rate of change of the average DAC value, which is an average of the rate of change of each of the calculated DAC values, by the first frequency error.
  10. delete
  11. delete
  12. delete
  13. delete
  14. 10. The method of claim 9,
    The operating method comprises:
    Communicating with at least one base station; And
    Generating a list of a base station of the base station from which the signal is received and selecting the base station that transmits the strongest signal from the list as the base station.
  15. 15. The method of claim 14,
    The operating method comprises:
    Receiving a synchronization signal from the base station; And
    And performing synchronization based on the received synchronization signal.
  16. 15. The method of claim 14,
    The operating method comprises:
    Receiving a synchronization signal from the base station at least once at a predetermined time;
    Performing synchronization based on the received synchronization signal; And
    Further comprising the step of deleting the current base station from the list and selecting the base station from which the strongest signal is searched for as a base station if no synchronization signal is received from the base station at a predetermined point in time How it works.
KR1020160052307A 2016-04-28 2016-04-28 Basestation for performing synchronization based on signal and operating method thereof KR101793731B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009504008A (en) 2005-07-26 2009-01-29 インターデイジタル テクノロジー コーポレーション Method and apparatus for automatically correcting receiver oscillator frequency
JP2010518669A (en) 2007-02-02 2010-05-27 ユビキシス リミテッドUbiquisys Limited Base station for mobile communication system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009504008A (en) 2005-07-26 2009-01-29 インターデイジタル テクノロジー コーポレーション Method and apparatus for automatically correcting receiver oscillator frequency
JP2010518669A (en) 2007-02-02 2010-05-27 ユビキシス リミテッドUbiquisys Limited Base station for mobile communication system

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