KR20100006111A - Mobile communication system of signal analysis method - Google Patents

Abstract

PURPOSE: A signal analysis method of a mobile communications system using DCI is provided to perform accurate analysis by analyzing each parameter extracted fro the DCI of the mobile communication signal allocated by the terminal. CONSTITUTION: A signal analysis command including a signal analysis frame length is inputted. The signal transmitted from the base station is received. The received signal is received as the signal analysis frame length included in the signal analysis command(S103). A DCI(Downlink Control Information) included in the corresponding frame is decoded(S109). The downlink information is allocated according to the terminal ID.

Description

Signal analysis method of mobile communication system

The present invention relates to a signal analysis method of a mobile communication system, and more particularly, to automatically search for a channel including downlink control information (DCI) from a mobile communication signal in analyzing signal quality of the mobile communication system. The present invention relates to a signal analysis method of a mobile communication system capable of measuring signals of a mobile communication system more effectively by analyzing various parameters extracted through DCI of a mobile communication signal allocated for each terminal in a channel.

To date, wireless access to the Internet is largely based on a platform such as WAP (Wireless Application Protocol) or WIPI (Wireless Internet Platform for Interoperability), and access through a mobile telephone network and public wireless LANs and access points. There is a way to approach it.

However, in the case of a mobile telephone network, there is a fundamental limitation as a universal means of accessing the Internet due to the limitation of screen size, input interface and billing system based on pay-as-you-go system. In addition, the wireless LAN has a fundamental problem in that it is vulnerable to mobility in addition to the local constraint that it can be used only within a few tens of meters around the access point.

To overcome these problems, WiBro, a national standard, and Long Term Evolution (LTE) of the 3rd Generation Partnership Project (3GPP) are proposed as a mobile WiMAX or a subset thereof, which enables high-speed Internet access even during stationary or vehicle movement with ADSL quality and cost. It is. Table 1 compares IEEE 802.16e 2005 with 3GPP-LTE.

LTE is a technology in which a circuit switch method is converted into a packet switch method to solve an inefficient problem of resource use of a circuit switch method. In the packet switch method of the LTE system, the use of radio resources is more efficient than the circuit switch method in that a terminal to which radio resources are to be allocated is selected according to whether or not data is required to be transmitted and received, and a wireless channel situation of the terminal that is dynamically changed according to time. There is a high advantage.

As described above, in the case of LTE, FDD is a main option in resource allocation, but in some cases, the TDD option can be used, and the time ratio of uplink and downlink is dynamically changed only for the option of LTE-TDD. Can change.

On the other hand, in the above-described measuring device for signal quality analysis of the mobile communication system, if the frame information is not known, it is not possible to guarantee reliable information provision at the physical layer level. In the conventionally developed measuring instrument, the user operating the measuring instrument directly inputs the information on the interface screen of the personal computer and analyzes it after knowing various information such as the modulation method for the input signal and the position information of the PDCCH present in the frame. I'm using the way.

However, in the above case, there is a disadvantage that the user must manage the relevant parameters of all the waveform files created for the test, and there is a possibility that the inexperienced operation may cause the time cost and the inaccuracy of the analysis. There is a problem in that accurate analysis cannot be performed because the location information and modulation scheme of each PDCCH and the time ratio of uplink and downlink can be changed dynamically.

The present invention was devised to solve this problem, and an object thereof is to automatically detect a channel including downlink control information (DCI) from a mobile communication signal in analyzing signal quality of an LTE system among mobile communication systems through a measuring instrument. The present invention provides a signal analysis method of a mobile communication system that enables fast, diverse and accurate analysis by searching and analyzing various parameters extracted through DCI of a mobile communication signal allocated to each terminal in a searched channel.

In the above-described signal analysis method of a mobile communication system, a channel including downlink control information (DCI) included in a mobile communication signal received from a base station is automatically searched, and the extracted DCI is analyzed to determine a signal quality. A) measuring and providing a signal analysis command including a terminal ID and a signal analysis frame length; Receiving a signal transmitted from the base station, and receiving the signal from the received signal by the signal analysis frame length included in the signal analysis command; C) decoding Downlink Control Information (DCI) including downlink information assigned to the corresponding terminal ID in the received frame; And d) extracting a parameter for signal analysis from the decoded DCI and analyzing and providing the same.

In addition, the signal analysis method of the mobile communication system according to another aspect of the present invention comprises the steps of: e) receiving a signal analysis command including a frame length for signal analysis; Receiving a signal transmitted from the base station, and receiving a signal analysis frame length included in the signal analysis command from the received signal; Analyzing the received frame but decoding downlink control information (DCI) including downlink information allocated for each terminal ID included in the frame; I) extracting a parameter for signal analysis from the decoded DCI and analyzing and providing the same.

In addition, the signal analysis method of the mobile communication system of the present invention is included in the received signal analysis frame to extract the sub-frame number, information on the number of transmit antennas, transmit power of the reference signal from the PBCH (Physical Broadcasting Channel) And f) extracting band width and scheduling information of the downlink for each terminal ID.

Accordingly, the signal analysis method of the mobile communication system according to the present invention automatically searches for a channel including the DCI from the mobile communication signal, and analyzes various parameters extracted through the DCI of the mobile communication signal allocated for each terminal in the searched channel. Therefore, it is possible to analyze quickly and variously and accurately, and to perform various analyzes using only a measuring instrument without a separate personal computer.

According to a characteristic aspect of the present invention, a signal analysis method of a mobile communication system according to the present invention may directly receive a terminal ID and decode the DCI through a CRC check using the corresponding terminal ID. In addition, when the terminal ID is not input, the DCI decoding is configured by 16 bit and is sequentially performed by performing a terminal ID and CRC check included in the corresponding subframe.

According to another aspect of the present invention, a signal analysis method of a mobile communication system according to the present invention includes a DCI in a PDCCH allocated to a terminal ID other than a region designated as a physical control format indicator channel (PCFICH) and a physical HARQ indicator channel (PHICH). Search from the REGs area of the.

According to another aspect of the present invention, the signal analysis method of the mobile communication system according to the present invention determines the presence and occupied bandwidth of the DCI included in the PDCCH through the power or EVM of the data subcarrier without CRC check and determines the parameters of the DCI. Can be calculated.

According to the signal analysis method of the mobile communication system of the present invention as described above, the DCI (DownLink Control Information) channel is automatically searched from the mobile communication signal, the DCI of the mobile communication signal allocated to each terminal in the searched channel By analyzing the various parameters extracted through the fast and various and accurate analysis is possible, without the need for a separate personal computer has the advantage that can perform a variety of analysis by only the instrument.

The foregoing and further aspects of the present invention will become more apparent through the preferred embodiments described with reference to the accompanying drawings. Hereinafter, the present invention will be described in detail to enable those skilled in the art to easily understand and reproduce the present invention.

1 is a schematic diagram schematically showing the structure of a LTE (Long Term Evolution) network, which is a conventional and mobile communication system to which the present invention is applied. The LTE system is an evolution from the existing UMTS system and is currently undergoing basic standardization in 3GPP.

The LTE network is composed of a terminal (hereinafter abbreviated as UE), a base station (hereinafter abbreviated as eNode B), and an access gateway (access gateway; hereinafter abbreviated as AG) located at an end of the network and connected to an external network. The AG may be divided into a user plane entity (UPE) node in charge of user traffic processing and a mobility management entity (MME) node in charge of control. At this time, the MME and the UPE node can communicate with each other using a new interface. One or more cells may exist in one eNode B. An interface X2 for transmitting user traffic or control traffic is defined between eNode Bs. The interface S1 is defined between the eNode B and the AG.

Layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems. (Second layer) and L3 (third layer), wherein a physical layer belonging to the first layer provides an information transfer service using a physical channel, and a third layer. A radio resource control (hereinafter referred to as RRC) layer located in a layer plays a role of controlling radio resources between a terminal and a network. To this end, the RRC layer exchanges RRC messages between the terminal and the network. The RRC layer may be distributed in network nodes such as an eNode B and an AG, or may be located only in the eNode B or an AG.

A downlink transmission channel for transmitting data from a network to a UE includes a broadcast channel (BCH) for transmitting system information and a downlink shared channel (SCH) for transmitting user traffic or control messages. Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH). Meanwhile, the uplink transmission channel for transmitting data from the terminal to the network includes a random access channel (RAC) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.

2 is a schematic diagram schematically showing a frame structure of a Long Term Evolution (LTE) system. As shown, LTE system has 10 subframes, one subframe is divided into two slots. One frame is composed of a plurality of channels and reference signals for piloting.

Here, the reference signal serves as a pilot, and the PDCCH (Physical Downlink Control Channel) stores the structure information of the frame during downlink, and the PBCH (Physical Broadcasting Channel) stores the information to be broadcast to the terminal in the cell. There is one every 10m. In addition, the Primary Synchronization Channel (P-SCH) and the Secondary Synchronization Channel (S-SCH) are used to transmit synchronization signals for synchronization. In addition, the remaining channel is composed of a physical downlink shared channel (PDSCH) used for transmitting and receiving data. This channel information is defined by the base station 100 at the time of network entry and is included in the downlink frame.

The LTE system is a technology for implementing high-speed packet-based communication of about 100 Mbps, and an Orthogonal Frequency Division Multiplexing (OFDMA) scheme is considered for this purpose. In the OFDMA system, unlike the CDMA scheme of allocating codes to distinguish radio resources for respective terminals, there are two-dimensional radio resources distinguished by frequency and time. That is, the OFDMA system divides and transmits a radio resource composed of time and frequency for downlink and uplink physical channels, and the radio resource is divided into a transmission time interval (TTI) and a subcarrier (subcarrier) group. Use resource blocks. A radio frame constituting such a radio resource consists of a subframe or TTI of 1 ms size. Therefore, in the case of a radio frame of 10 ms, 10 subframes constitute one radio frame.

3 is a block diagram schematically illustrating a signal measuring device of a mobile communication system according to an exemplary embodiment of the present invention. As shown, a signal measuring instrument of a mobile communication system in which the signal analysis method of the present invention is performed displays a key input unit 10 used to receive or input various items necessary for signal analysis from a user, and a result analyzed by the measuring instrument. Signal receiving unit for receiving a mobile communication signal from the base station through the flat panel display 20 and the RF input terminal 30 to convert to a baseband signal and converts the analog signal into a digital signal through A / D sampling 40 and the controller 60 which collectively controls the overall operation of the instrument according to the signal analysis method of the present invention to perform necessary analysis and displays the result on the flat panel display 20.

In addition, the synchronization and channel compensator 50 for improving the quality of the distorted received signal through a synchronization process and a compensation algorithm for determining a starting point and cell information of the received signal converted into a digital signal by the signal receiver 40 is provided. It may further include.

In the above-described configuration, the key input unit 10 includes a number / letter key button for inputting numbers and characters, various function key buttons, and jog buttons used to designate various indexes or menu items including numbers in various menus. Can be.

The flat panel display 20 may be implemented as an LCD panel, and the like. The controller 60 may include various types of data generated during a signal analysis process and a program memory equipped with a microprocessor, an algorithm for performing the signal analysis method of the present invention. It may comprise a data memory 70 for temporarily storing. The RF input terminal 30 may be connected to a wired cable or a wireless antenna through various connection jacks.

For example, the controller 60 may be implemented as a microcontroller in which a microprocessor for calculation and a peripheral circuit are implemented as one integrated circuit, and receive and analyze a mobile communication signal received by the signal receiver 40. Next, the analysis result is output to the flat panel display 20. The mobile communication signal analysis of the control unit 60 will be described in more detail through the signal analysis method of the mobile communication system described below.

4 is a flowchart schematically illustrating a signal analysis process of a mobile communication system according to an exemplary embodiment of the present invention. As shown, the signal analysis method of the mobile communication system according to the present invention, a) receiving a signal analysis command including a terminal ID and a signal analysis frame length, and receives a signal transmitted from the base station, the received signal B) receiving the signal analysis frame length included in the signal analysis command in step c), decoding the DCI including the downlink information assigned to the corresponding terminal ID in the received frame, and analyzing the signal from the decoded DCI. D) extracting the parameters for and analyzing them and providing them.

When the user, i.e., the mobile communication signal operator drives the measuring instrument for measuring the mobile communication signal of the terminal desired by the user, the measuring instrument measures the length of the reference signal analysis frame and the terminal ID (User Element ID) for measuring the mobile communication signal transmitted from the base station. (Hereinafter referred to as "UE ID").

Accordingly, the user inputs a 16-bit UE ID and a frame number of a signal to be sampled through the key input unit 10 (S101). In the LTE system, a UE ID allocated from a base station to a terminal is implemented in 16-bit binary. Accordingly, the user inputs a 16-bit UE ID and a reference signal analysis frame length for sampling, for example, a frame number of 10, 20 30, or a time of 1, 2, 3 seconds.

When the UE ID and the reference signal analysis frame length are input, the meter receives the mobile communication signal transmitted from the base station and stores the length of the reference signal analysis frame at step S103. At this time, the signal receiving unit 40 receives the mobile communication signal received through the RF input terminal 30, changes to a baseband signal, and converts the analog signal into a digital signal and outputs it to the control unit 60.

The controller 60 receives the mobile communication signal converted into a digital signal output from the signal receiver 40 and checks whether the corresponding UE ID exists in the received frame (S105). If the UE ID exists, the corresponding UE ID exists. The PDCCH allocated to is detected (S107).

According to a characteristic aspect of the present invention, a signal analysis method of a mobile communication system according to the present invention comprises the steps of: c1) searching for a terminal ID corresponding to a terminal ID input from an extracted frame for DCI extraction and decoding of the extracted DCI; And c2) detecting the PDCCH in the subframe assigned to the retrieved terminal ID and decoding the DCI from the detected PDCCH.

One frame of the mobile communication signal transmitted from the base station may be allocated to one terminal or may be allocated to more than one UE ID. In addition, when there is a large amount of data required by one UE ID, a plurality of frames may be allocated to one UE ID.

Accordingly, a plurality of PDCCHs allocated for each UE ID or service type provided to the terminal are present in the frame received through the meter. The controller 60 extracts the DCI from the PDCCH corresponding to the corresponding UE ID in the plurality of PDCCHs, and decodes the extracted DCI (S109).

5A and 5B are schematic diagrams schematically illustrating a frame transmitted by a base station through four antenna ports and received by a measuring instrument in an LTE system in which the present invention is used. As shown in the figure, four PDCCHs ranging from 0 to 3 exist in a frame received by the instrument, and DCI is stored in each PDCCH. Each of the four PDCCHs in FIG. 5 may correspond to a UE ID and may also correspond to each other according to a service.

Here, when the PDCCH corresponding to the input UE ID is found, the controller 60 decodes the DCI through the CRC parity bits included in the input UE ID and the PDCCH of the frame. The coding of the DCI included in the PDCCH transmitted from the base station is performed by tail-biting convolution coding, which is coded together with the UE ID. Tail-biting Convolutional coding is a method of initializing the register of the encoder using the last bit of the data block to be coded. Thus, the register's initial and last state are the same. Accordingly, the controller 60 decodes the DCI from the PDCCH by tail biting convolution decoding.

According to a characteristic aspect of the present invention, the control unit 60 according to the present invention starts from a REGs area other than an area designated as a physical control format indicator channel (PCFICH) and a physical HARQ indicator channel (PHICH) in the PDCCH when decoding the DCI from the PDCCH. Search for and decode DCI. In the LTE standard process, the DCI is allocated to regions other than the PCFICH and PHICH allocated to the fixed region in the PDCCH, that is, the REGs region. Accordingly, the controller 60 searches for the presence or absence of DCI from the region other than the region to which the PCFICH and PHICH are allocated, and if the existence is confirmed, decodes the DCI through the tail biting convolution decoding and extracts a parameter for signal analysis.

The DCI includes resource allocation information of a physical channel (PCH), a DL-SCH, and a hybrid-ARQ (HARQ) in a downlink shared channel (DL-SCH). It also includes downlink and uplink transmission scheduling information or uplink power control instructions. There are five formats of DCI present in the PDCCH, and each plays a different role according to the format. The format of DCI present in the PDCCH is defined as shown in Table 2.

Accordingly, the controller 60 determines the format of the decoded DCI and extracts a parameter from the DCI. The DCI format-specific parameters present in the PDCCH are shown in Tables 3 to 6, and in the case of format 3, PUCCH (Physical Uplink Control Channel) and PUSCH (Physical Uplink Shared Channel) transmission power are defined through 2 bits.

According to a characteristic aspect of the present invention, the control unit 60 according to the present invention uses a method of constructing a hypothesis for each format to verify the total number of DCIs present in the PDCCH and each format, and verifying this through the CRC check unit. That is, since the length or size of the content is different for each DCI format, the offset position of the CRC, which is inserted at the end of the DCI, varies according to the format. Accordingly, the controller 60 may determine different formats and estimate the total number of DCIs included in the downlink control channel (DLCCH) based on whether the CRC checker passes.

In more detail, since the control unit cannot immediately determine what format DCI is transmitted from the transmitting side, that is, the base station, only the received frame, the hypothesis corresponding to all DCI format types, that is, five formats, is established. There is no choice but to solve the true / false of each one depending on whether the CRC passes. As a result, the receiver does not know how many DCIs are concatenated and transmitted in the PDCCH region at first, but since it is necessary to solve the problem for the first DCI first, the hypothesis of five cases according to each format is hypothesized. Determine if the format is correct.

That is, if the format of the first DCI is matched, the process of figuring out which DCI format is repeated with five hypotheses for the signal corresponding to the next partial region in the PDCCH region is repeated. Each DCI of may be sequentially decoded.

Accordingly, the control unit 60 decodes the DCI allocated to the PDCCH through the UE ID and the CRC check, and determines the format of the DCI existing in the corresponding PDCCH through the DCI (S111). In addition, when the format of the DCI present in the PDCCH is determined, the parameters of the DCI are extracted (S113), and each extracted parameter value is analyzed with reference to the format of the DCI present in the PDCCH, and the analysis result is displayed on the flat panel display 20. By displaying in, the quality of the mobile communication signal of the UE ID input by the user can be measured (S115).

The analysis result displayed by the controller according to the present invention may be, for example, analysis information such as Error Vector Magnitude, Error Vector Spectrum, Error Vector Time, I / Q Constellation, Cell ID, and Segment.

According to another aspect of the present invention, a signal analysis method of a mobile communication system according to the present invention provides mobile communication signal quality by UE ID or service type assigned to a corresponding frame only by input of a frame length that a user wants to analyze without inputting a UE ID. Can be measured.

6 is a flowchart schematically illustrating a signal analysis process of a mobile communication system according to another aspect of the present invention. As shown, the signal analysis method of the mobile communication system according to another aspect of the present invention, step e) receiving a signal analysis command including a frame length for signal analysis, and receives a signal transmitted from the base station, G) receiving the signal analysis frame length included in the signal analysis command from the received signal, and analyzing the received frame, including downlink information allocated for each terminal ID included in the frame. H) decoding information) and i) extracting a parameter for signal analysis from the decoded DCI and analyzing and providing the same.

  In addition, the subframe number, information on the number of transmission antennas, and transmission power information of the reference signal are extracted from the PBCH (Physical Broadcasting Channel) included in the received signal analysis frame. The method may further include f) extracting the information.

When the user, i.e., the mobile communication signal measurer drives the measuring device for measuring the mobile communication signal of the desired terminal, the measuring device requests input of a length of a reference signal analysis frame for measuring the mobile communication signal transmitted from the base station.

Accordingly, the user inputs the number of frames of the signal to be sampled through the key input unit 10, and the reference signal analysis frame length for sampling is, for example, the number of frames such as 10, 20 30, or 1, 2, 3 seconds and the like. The same time is input (S201).

When the reference signal analysis frame length is input, the meter receives the mobile communication signal transmitted from the base station and stores the length of the reference signal analysis frame. At this time, the signal receiving unit 40 receives the mobile communication signal received through the RF input terminal 30, changes to a baseband signal, and converts an analog signal into a digital signal and outputs it to the control unit 60 (S203).

At this time, the control unit 60 is included in the received signal analysis frame to extract the subframe number, information on the number of transmit antennas, transmit power information of the reference signal from the PBCH, and through this the band whistle and scheduling information of the downlink for each UE ID To retrieve the frame information allocated for each UE ID (S205).

According to a characteristic aspect of the present invention, if the PCFICH or PHICH is searched at the time of the received frame search, the controller 60 determines that it is a new PDCCH and starts DCI extraction and decoding. At this time, since the control unit 60 of the instrument does not know the UE ID to which the corresponding PDCCH is assigned, the UE ID formed with 16 bits is sequentially input to perform DCI decoding, and the UE ID input when the DCI decoding succeeds is stored in the memory 70. By using at the next decoding, the UE ID existing in the frame is extracted (S207). The controller 60 detects an allocated PDCCH for each extracted UE ID (S209).

According to an additional aspect of the present invention, the control unit 60 according to the present invention may decode the DCI by determining the presence and occupied bandwidth of the DCI included in the PDCCH through the power of the data subcarrier or the EVM.

Accordingly, the controller 60 determines whether the signal is sufficiently clean and whether the resource is allocated to the downlink is accessible by the power of the DATA subcarrier or the EVM, and indirectly the presence and length information of the DCI in the DLCCH. You can check. Accordingly, the presence of DCI and the region of the OCCUPIED subcarrier are identified by their power or EVM at the PHY level, and in the overall embodiment, it can be assumed that the input signal is clean, so there is no CRC error. Since all DCIs are accessible, resources allocated to all downlinks can be accessed, so that parameters included in DCIs can be extracted without CRC checking.

According to a characteristic aspect of the present invention, the control unit 60 according to the present invention starts from a REGs area other than an area designated as a physical control format indicator channel (PCFICH) and a physical HARQ indicator channel (PHICH) in the PDCCH when decoding the DCI from the PDCCH. Search for and decode DCI. In the LTE standard process, the DCI is allocated to regions other than the PCFICH and PHICH allocated to the fixed region in the PDCCH, that is, the REGs region.

Accordingly, the controller 60 searches for the presence or absence of the DCI from the region other than the region to which the PCFICH and the PHICH are allocated, and decodes the DCI through Tail biting convolution decoding as described above (S211).

The DCI includes resource allocation information of the PCH, DL-SCH, and HARQ in the DL-SCH. It also includes downlink and uplink transmission scheduling information or uplink power control instructions. As described above, DCIs present in the PDCCH are defined in five formats. Accordingly, the controller 60 determines the format of the DCI existing in the PDCCH through the decoded DCI (S213). In addition, when the format of the DCI present in the PDCCH is determined, the parameters of the DCI are extracted (S215), and each extracted parameter value is analyzed with reference to the format of the DCI present in the PDCCH, and the analysis result is displayed on the flat panel display 20. By displaying in, the quality of the mobile communication signal of the UE ID input by the user can be measured (S217).

The analysis result displayed by the controller according to the present invention may be, for example, analysis information such as Error Vector Magnitude, Error Vector Spectrum, Error Vector Time, I / Q Constellation, Cell ID, and Segment.

1 is a schematic diagram schematically showing the structure of a LTE (Long Term Evolution) network, which is a conventional and mobile communication system to which the present invention is applied.

2 is a schematic diagram schematically showing a frame structure of a Long Term Evolution (LTE) system.

3 is a block diagram schematically illustrating a signal measuring device of a mobile communication system according to an exemplary embodiment of the present invention.

4 is a flowchart schematically illustrating a signal analysis process of a mobile communication system according to an exemplary embodiment of the present invention.

5A and 5B are schematic diagrams schematically showing a frame transmitted by a base station through four antenna ports and received by a meter in an LTE system in which the present invention is used.

6 is a flowchart schematically illustrating a signal analysis process of a mobile communication system according to another aspect of the present invention.

<Description of the symbols for the main parts of the drawings>

10. Key input 20. Flat panel indicator

30. RF input terminal 40. Signal receiver

50. Synchronization and channel compensation unit 60. Control unit

70. Memory

Claims (8)

E) receiving a signal analysis command including a frame length for signal analysis; Receiving a signal transmitted from a base station, and receiving a signal analysis frame length included in the signal analysis command from the received signal; Analyzing the received frame but decoding downlink control information (DCI) including downlink information allocated for each terminal ID included in the frame; I) extracting a parameter for signal analysis from the decoded DCI and analyzing and providing the same. The method of claim 1, wherein the signal analysis method of the mobile communication system comprises: It is included in the received signal analysis frame to extract the subframe number, information on the number of transmit antennas, transmit power information of the reference signal from the physical broadcasting channel (PBCH), and through this, the band whistle and scheduling information of the downlink for each terminal ID are obtained. The signal analysis method of the mobile communication system further comprising the step of extracting. The method of claim 1, wherein step h) is: H1) extracting one or more terminal IDs included in the frame; Detecting a physical downlink control channel (PDCCH) in a subframe allocated for each extracted terminal ID, and decoding a DCI from the detected PDCCH. The method of claim 3, wherein step h2) comprises: And detecting a DCI from a region of REGs other than those designated as a physical control format indicator channel (PCFICH) and a physical HARQ indicator channel (PHICH) within a PDCCH allocated for each terminal ID. The method according to claim 4, wherein the DCI decoding of step h2) is: The signal analysis method of the mobile communication system, characterized in that the 16-bit terminal ID sequentially assigned through the CRC check included in the subframe. The method of claim 1, wherein step h) is: The signal analysis method of the mobile communication system, characterized in that the DCI is decoded by determining the presence and occupied bandwidth of the DCI contained in the PDCCH through the power of the data sub-carrier or EVM. The method of claim 1, wherein step i) comprises: I1) determining the format of the DCI present in the PDCCH through the DCI; I2) extracting a parameter for each format according to the format of DCI present in the determined PDCCH; And i3) analyzing and providing a mobile communication signal assigned to the corresponding terminal ID with reference to the extracted parameter. The method of claim 7, wherein step i1) comprises: The signal analysis method of the mobile communication system, characterized in that the format of the DCI by determining the offset position of the CRC in the DCI present in the PDCCH.

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