KR101423039B1 - uplink synchrinizing apparatus and method for base station testing equipment - Google Patents

uplink synchrinizing apparatus and method for base station testing equipment Download PDF

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KR101423039B1
KR101423039B1 KR1020130052645A KR20130052645A KR101423039B1 KR 101423039 B1 KR101423039 B1 KR 101423039B1 KR 1020130052645 A KR1020130052645 A KR 1020130052645A KR 20130052645 A KR20130052645 A KR 20130052645A KR 101423039 B1 KR101423039 B1 KR 101423039B1
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South Korea
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signal
base station
timing
dl
ul
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KR1020130052645A
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Korean (ko)
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정종태
정진섭
이주형
임용훈
임종호
장병관
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주식회사 이노와이어리스
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • H04W24/06Testing, supervising or monitoring using simulated traffic
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements

Abstract

The present invention can simplify the configuration of the base station test equipment and the base station by extracting the synchronization signal from the downlink from the base station and adjusting the uplink synchronization without having a separate external terminal in the base station test equipment and the base station, To an apparatus and method for synchronizing an uplink signal of a base station test equipment so as to lower a manufacturing cost of a base station and improve productivity.
An uplink signal synchronization apparatus of a base station test equipment according to an aspect of the present invention includes: a duplexer for receiving a DL signal and transmitting a UL signal using an RF port with a base station; A DL synchronization detector for detecting DL timing from a DL signal received from the base station through the duplexer; A reference timing signal generator for generating a reference timing signal by correcting the initial timing by the DL timing; A UL timing signal generator for generating a UL timing signal by applying a timing offset of UL and DL to the reference timing signal, and a UL test signal generator for outputting the UL test signal through the duplexer in synchronization with the UL timing signal .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an uplink signal synchronizing apparatus and method for a base station test equipment,

The present invention relates to an apparatus and method for synchronizing an uplink signal of a base station test apparatus, and more particularly, to an apparatus and method for synchronizing an uplink signal in a base station test apparatus, To an apparatus and method for synchronizing an uplink signal of a base station test apparatus capable of simplifying the configuration of a base station test equipment and a base station, thereby lowering a manufacturing cost of the base station and improving productivity.

1 is a block diagram illustrating a connection state between a base station test equipment and a base station according to a method of uplink signal synchronization of a conventional base station test equipment. 1, a base station test equipment 20 for testing uplink of a conventional base station transmits an uplink (UL) test signal of a predetermined format according to a reference time set by the base station 10 do.

To this end, the conventional base station test equipment 20 transmits a UL test signal to the base station 10 via the respective RF ports 22 and 12 with the base station 10, And a timing synchronization signal for determining a timing to transmit the UL test signal through an external trigger terminal 24 and 14 provided separately from the RF ports 22 and 12 to the base station 10 do. The base station test equipment 20 and the base station 10 transmit the timing synchronization signal through each of these external trigger terminals 24 and 14 to the base station test equipment 20, Signal or provides a timing synchronization signal from the base station 10 to the base station test equipment 20.

2 is an internal block diagram of a base station test equipment for explaining an uplink signal synchronization method of a conventional base station test equipment. 2, according to the uplink signal synchronization method of the conventional base station test equipment, the UL timing signal generator 28 and the UL test signal generator 26 are provided in the base station test equipment 20.

In the above-described configuration, for example, when the base station 10 provides the timing synchronization signal to the base station test equipment 20 via the external trigger terminals 14 and 24, the UL timing signal of the base station test equipment 20 The unit 28 uses the timing synchronization signal as a reference timing signal and adds a timing offset between the uplink and the downlink (DL) defined in the communication standard, for example, the LTE communication standard UL timing signal.

Next, the UL test signal generating unit 26 generates the UL test signal immediately after the UL timing signal is provided from the UL timing signal generating unit 28, and then transmits the UL test signal to the base station 10 via the RF ports 24 and 14 .

However, according to the uplink signal synchronization method of the conventional base station test equipment as described above, a base station needs to generate a separate physical signal for testing purposes only and also requires a hardware device such as an external trigger terminal for processing the signal Therefore, the manufacturing cost of the base station is increased. Furthermore, since the base station test equipment and the base station must be connected through separate cables, the configuration of the test equipment becomes complicated.

In addition, if the configuration of the test apparatus becomes complicated, the verification procedure becomes complicated and the time required for setting up the test environment becomes long. Therefore, productivity of the small base station, which requires mass production such as femtocell, .

The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a base station test apparatus and a base station test apparatus by extracting a sync signal from a downlink from a base station, It is an object of the present invention to provide an uplink signal synchronizing apparatus and method of a base station test equipment capable of simplifying the configuration of a base station, thereby lowering a manufacturing cost of a base station and improving productivity.

According to another aspect of the present invention, there is provided an apparatus for synchronizing an uplink signal of a base station test equipment, comprising: a duplexer for receiving a DL signal and transmitting a UL signal using an RF port with a base station; A DL synchronization detector for detecting DL timing from a DL signal received from the base station through the duplexer; A reference timing signal generator for generating a reference timing signal by correcting the initial timing by the DL timing; A UL timing signal generator for generating a UL timing signal by applying a timing offset of UL and DL to the reference timing signal, and a UL test signal generator for outputting the UL test signal through the duplexer in synchronization with the UL timing signal .

The uplink signal synchronization apparatus of the base station test equipment according to the second aspect of the present invention includes a DL synchronization detecting unit for detecting a DL timing from a DL signal received through an RF port with a base station, A UL timing signal generator for generating a UL timing signal by applying a timing offset of UL and DL to the reference timing signal and a UL timing signal generator for generating a UL test signal at the UL timing And a UL test signal generation unit for outputting the signal to the base station in synchronization with the signal.

The first and second features are applied to an LTE or LTE-A system, and the DL synchronization detector detects a Primary Synchronization Signal (PSS) or a Secondary Synchronization Signal (SSS) included in the DL signal.

The base station test equipment is a femtocell test equipment.

A method of synchronizing an uplink signal of a base station test equipment according to a third aspect of the present invention includes: (a) extracting a DL timing after receiving a DL signal periodically transmitted from a base station; (B) generating a correction reference timing signal synchronized with a DL timing by correcting a reference timing signal periodically generated based on an arbitrary initial timing by the DL timing; (C) generating a UL timing signal by applying a timing offset of UL and DL to the correction reference timing signal, and (d) transmitting a UL test signal to the base station in synchronization with the UL timing signal.

In the third aspect, the DL timing is a Primary Synchronization Signal (PSS) or a Secondary Synchronization Signal (SSS).

The steps (a) to (d) are performed periodically one or more times.

According to the apparatus and method for synchronizing the uplink signals of the base station test equipment of the present invention, it is possible not only to lower the manufacturing cost of the base station equipment by removing the external trigger terminal provided in the base station for testing purposes, So that the productivity of the base station can be improved by testing more base stations per unit time.

1 is a block diagram showing a connection state of a base station test equipment and a base station according to a method of uplink signal synchronization of a conventional base station test equipment.
FIG. 2 is an internal block diagram of a base station test equipment for explaining an uplink signal synchronization method of a conventional base station test equipment.
3 is a block diagram illustrating a connection state of a base station test equipment and a base station according to a method of uplink signal synchronization in a base station test equipment of the present invention.
4 is an internal block diagram of an uplink signal synchronizer of a base station test equipment according to an embodiment of the present invention.
5 is an internal block diagram of an uplink signal synchronizer of a base station test equipment according to another embodiment of the present invention.
6 is a flowchart illustrating a method of synchronizing an uplink signal of a base station test equipment according to the present invention.
7 is a timing chart for explaining an uplink signal synchronization method of a base station test equipment according to the present invention.

Hereinafter, preferred embodiments of an uplink signal synchronization apparatus and method of a base station test equipment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram showing a connection state between a base station test equipment and a base station according to the uplink signal synchronization method of the base station test equipment of the present invention. As shown in FIG. 3, the base station test equipment 200 for the uplink signal synchronization method of the base station test equipment of the present invention and the base station 100 are provided with external trigger terminals for sharing a timing synchronization signal Only RF ports 210 and 110 for transmitting and receiving UL and DL signals are provided.

In the above-described configuration, the base station test equipment 200 performs UL synchronization using the DL signal provided from the base station 100 via the RF ports 210 and 110 provided in each of the base stations.

On the other hand, in the LTE communication system, the synchronization signal is transmitted twice for every 10 ms radio frame. The synchronization signal includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). The PSS and the SSS have different structures depending on whether the UE is connected to an FDD (Frequency Division Duplexing) cell or a TDD (Time Division Duplexing) cell.

For example, in the FDD cell, the PSS is located in the last OFDM symbol of the first slot and the 11th slot of the 10ms radio frame. A slot has 6 or 7 OFDM symbols according to a CP (Cyclic Prefix) length. Since the PSS is located in the last symbol of the slot, the UE can acquire the slot boundary timing regardless of the CP length. The SSS is located in the previous symbol of the PSS and it is possible to coherently detect the SSS on the basis of the PSS on the assumption that the radio channel characteristic is constant for a time longer than the OFDM symbol length.

In the TDD cell, the PSS is located in the third symbol of the third and the thirteenth slot, and the SSS is located before the three symbols based on the PSS. In this case, coherent detection is possible on the assumption that the coherence time of the channel is sufficiently longer than the four OFDM symbol periods.

In the LTE communication system, in order to access a base station, that is, an LTE cell, the UE must undergo a cell search process. The cell search process includes a series of synchronization processes in which the UE can determine time and frequency parameters. The terminal can demodulate the DL signal and transmit the UL signal at an appropriate time.

4 is an internal block diagram of an uplink signal synchronizer of a base station test equipment according to an embodiment of the present invention. 4, the base station test equipment 200 for the uplink signal synchronization method of the base station test equipment of the present invention uses a single RF port 210 with the base station 100, A DL / UL switch 220 for receiving a DL signal from a base station 100 and a duplexer 220 for receiving a DL signal from the base station 100,

Figure 112013041162068-pat00001
) Detected by the DL synchronization detecting unit 230, a DL synchronization detecting unit 230 for detecting the DL timing
Figure 112013041162068-pat00002
A reference timing generator 240 for correcting the initial timing arbitrarily determined by the reference timing generator 240 and generating a reference timing signal, A UL timing signal generator 250 for generating a UL timing signal by applying a standard or UL / DL timing offset defined by a tester to a reference timing signal, and a UL test signal generator 250 for generating a UL timing signal, And transmits it to the base station 100 through the duplexer 220 and RF ports 210 and 110 in synchronization with the UL timing signal provided from the UL timing signal generator 250 260).

5 is an internal block diagram of an uplink signal synchronizer of a base station test equipment according to another embodiment of the present invention. 5, in this embodiment, unlike the configuration shown in FIG. 4, the base station test equipment 200 'is divided into a DL receiving unit RP and an UL transmitting unit TP, The duplexer shown in Fig. 4 is omitted. 5, reference numerals 210 'and 210' denote RF ports which are respectively provided in the receiving unit RP and the transmitting unit TP and which communicate with the RF port 110 'of the base station 100'.

On the other hand, the receiving unit RP includes a DL synchronization detecting unit 230 'for detecting the DL timing from the DL signal received via the RF port 210' with the base station 100 ', and an initial timing by the DL timing And a reference timing signal generator 240 for generating a reference timing signal by correcting the reference timing signal. Next, the transmission unit TP includes a UL timing signal generator 250 'for generating a UL timing signal by applying a timing offset of UL and DL to a reference timing signal, and a UL timing signal generator 250' for generating a UL test signal in synchronization with the UL timing signal And a UL test signal generating unit 260 'for outputting the UL test signal.

FIG. 6 is a flowchart illustrating an uplink signal synchronization method of a base station test equipment according to the present invention. FIG. 7 is a timing chart illustrating a method of uplink signal synchronization in a base station test equipment of the present invention. 6, in step S10, the base station test equipment 200 transmits a DL signal (not shown) as shown in FIG. 7 (a) periodically transmitted from the base station 100 through the RF port and the duplexer 220, .

Next, in step S20, the base station test equipment 200 extracts the DL timing from the DL signal received in step S10 through the DL synchronization detector 230, as shown in FIGS. 7 (b) and 7 (c) Based on the initial timing signal, this DL timing is < RTI ID = 0.0 >

Figure 112013041162068-pat00003
. ≪ / RTI >

Next, in step S30, the base station test equipment 200 periodically generates a reference timing signal (e.g., a reference timing signal) generated every 10 ms, which is an LTE radio frame signal period, for example, based on an arbitrary initial timing as shown in (reference timing signal) to the DL timing

Figure 112013041162068-pat00004
Thereby generating a reference timing signal synchronized with the DL timing.

Next, in step S40, the base station test equipment 200 generates a timing offset between the UL and the DL defined by the specifier or the tester in the corrected reference timing signal generated in step S30 as shown in FIG. 7 (d) To generate a UL timing signal.

Finally, in step S50, the base station test equipment 200 generates a UL test signal, and transmits the UL test signal thus generated in synchronization with the UL timing signal to the duplexer 220 and the RF port (210) to the base station (100).

The reference timing signal calculated by the base station test equipment 200 and the DL signal transmitted from the base station 100 due to a minute frequency difference between oscillators used in the base station test equipment 200 and the base station 100, The reference timing signal calculated by the base station test equipment 200 and the DL signal transmitted from the base station 100 may be repeated by repeating the steps S20 to S50 by a certain number of times or by repeating the same at a predetermined time period, It is preferable to match the timing of the signals exactly.

While the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Will be possible. Accordingly, the scope of the present invention should be determined by the following claims.

For example, the present invention is applicable to but not limited to LTE systems or LTE-A systems. In case of applying to the LTE system, the DL timing signal may be all signals that can be included in the DL signal and used as the DL synchronization signal in addition to the above-described PSS or SSS.

10: base station, 12: RF port,
14: External trigger terminal, 20: Base station test equipment,
22: RF port, 24: external trigger terminal,
26: UL test signal generator, 28: UL timing signal generator,
100, 100 ': Base station, 110, 110': RF port,
200, 200 ': base station test equipment, 210, 210', 210 ": RF port,
220: duplexer 230, 230 ': DL synchronization detector,
240, 240 ': a reference timing signal generator,
250, 250 ': UL timing signal generator,
260, 260 ': UL test signal generator

Claims (7)

  1. A duplexer for receiving a DL signal and transmitting a UL signal using an RF port between the base station and the base station;
    A DL synchronization detector for detecting DL timing from a DL signal received from the base station through the duplexer;
    A reference timing signal generator for generating a reference timing signal by correcting the initial timing by the DL timing;
    A UL timing signal generator for generating a UL timing signal by applying a timing offset of UL and DL to the reference timing signal;
    And a UL test signal generator for outputting a UL test signal through the duplexer in synchronization with the UL timing signal.
  2. A receiving unit having a DL synchronization detecting unit for detecting a DL timing from a DL signal received through an RF port with the base station and a reference timing signal generating unit for generating a reference timing signal by correcting the initial timing by the DL timing;
    A UL timing signal generator for generating a UL timing signal by applying a timing offset of UL and DL to the reference timing signal, and a UL test signal generator for outputting a UL test signal to the base station in synchronization with the UL timing signal. And an uplink signal synchronizer of the base station test equipment.
  3. 3. The method according to claim 1 or 2,
    Applies to LTE or LTE-A systems,
    Wherein the DL synchronization detector detects a PSS (Primary Synchronization Signal) or an SSS (Secondary Synchronization Signal) included in the DL signal.
  4. 3. The method according to claim 1 or 2,
    Wherein the base station test equipment is a femtocell test equipment.
  5. (A) extracting a DL timing after receiving a DL signal periodically transmitted from a base station;
    (B) generating a correction reference timing signal synchronized with a DL timing by correcting a reference timing signal generated periodically based on an arbitrary initial timing by the DL timing;
    (C) applying a timing offset of UL and DL to the correction reference timing signal to generate a UL timing signal, and
    And transmitting the UL test signal to the base station in synchronization with the UL timing signal.
  6. 6. The method of claim 5,
    Applies to LTE or LTE-A systems,
    Wherein the DL timing is a Primary Synchronization Signal (PSS) or a Secondary Synchronization Signal (SSS).
  7. The method according to claim 5 or 6,
    Wherein the steps (a) to (d) are periodically performed one or more times.
KR1020130052645A 2013-05-09 2013-05-09 uplink synchrinizing apparatus and method for base station testing equipment KR101423039B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050071241A (en) * 2003-12-31 2005-07-07 엘지전자 주식회사 Apparatus and method for calibrating absolute time dely of transmitting/receiving path in base station
KR20090031461A (en) * 2006-07-14 2009-03-25 콸콤 인코포레이티드 Uplink access request in an ofdm communication environment
JP2009250803A (en) * 2008-04-07 2009-10-29 Advantest Corp Test device, measuring instrument, program, test method, and measuring method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050071241A (en) * 2003-12-31 2005-07-07 엘지전자 주식회사 Apparatus and method for calibrating absolute time dely of transmitting/receiving path in base station
KR20090031461A (en) * 2006-07-14 2009-03-25 콸콤 인코포레이티드 Uplink access request in an ofdm communication environment
JP2009250803A (en) * 2008-04-07 2009-10-29 Advantest Corp Test device, measuring instrument, program, test method, and measuring method

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