KR20110077271A - Appartus and method for error detection of map message in mobile communication system - Google Patents

Abstract

PURPOSE: An apparatus for detecting error of a MAP message and method thereof in a mobile communications system are provided to perform an error confirmation when a terminal decode MAP message and a false detection occurs. CONSTITUTION: A controller(380) determines a bit number of a ID field about a receiver from a MAP message receiver. The controller adds receiver identifiers to the ID field according to the ID field of bit numbers. A transmission unit completes the MAP message. The transmission unit transmits the completed MAP message to the receiver.

Description

APPARATUS AND METHOD FOR ERROR DETECTION OF MAP MESSAGE IN MOBILE COMMUNICATION SYSTEM}

The present invention relates to error detection of a MAP message. In particular, when a false detection occurs when decoding a MAP message in a mobile communication system such as a broadband wireless access system, additionally performing error checking for the MAP message. An apparatus and method are provided.

The 4th Generation (hereinafter referred to as '4G') communication system aims to provide services with various quality of service (QoS) using a transmission rate of about 100 Mbps. For this reason, active research is being conducted for this purpose.

In particular, research is currently being actively conducted to support high-speed services in a form of guaranteeing mobility and QoS in a broadband wireless access (BWA) communication system such as a wireless local area network system and a wireless urban area network system in a 4G communication system. Is going on.

The representative communication system is the Institute of Electrical and Electronics Engineers (IEEE) 802.16 system. The IEEE 802.16 system uses Orthogonal Frequency Division Multiplexing (OFDM) / Orthogonal Frequency Division to support a broadband transmission network on a physical channel. Multiple Access, hereinafter referred to as " OFDMA "

In a mobile communication system (or a broadband wireless communication system) such as the IEEE 802.16 system, resources are allocated to terminals in units of blocks occupying a certain section of the frequency axis and a certain section of the time axis.

Accordingly, the base station transmits information about resource allocation to the terminal, and the terminal identifies the location of the resource block allocated to the terminal through the information about the resource allocation. Here, the information about the resource allocation is called a MAP (MAP) message. In general, the MAP message includes resource allocation information in a predetermined resource region and is transmitted periodically.

When the MAP message is transmitted by separate coding, each MAP message should include a terminal ID and a CRC. In this case, since much overhead is required, the terminal identifier is masked and transmitted to the CRC.

Accordingly, all terminals must decode each MAP message, and only the corresponding terminal can decode the MAP message because the terminal identifier is masked in the CRC.

However, since the error detection capability of the masked CRC is limited, there is a case that a low probability but unintentional user incorrectly judges a specific MAP message as his own.

That is, when an error occurs in channel decoding, an error pattern and an identifier pattern of an unintended user are combined with each other during the demasking and the CRC checking process to detect an error in the CRC.

If such false detection occurs, HARQ feedback (ACK / NACK) information may be interfered with uplink transmission for downlink MAP, and interference may be caused when the data traffic is transmitted for uplink MAP. It can cause a lot of interference to users.

Therefore, there is a need for an apparatus and method for minimizing the probability of occurrence of such inaccuracies or for determining additional inaccuracies when such inaccuracies occur.

An object of the present invention is to provide an apparatus and method for error detection of a MAP message in a mobile communication system.

The present invention provides an apparatus and method for additionally performing an error check when a false detection occurs when a terminal decodes a MAP message in a mobile communication system.

According to a first aspect for achieving the object of the present invention, a method for determining the number of bits of the ID field for the receiver in the MAP message to be transmitted to the receiver in the resource allocation method of the transmitter in the mobile communication system and the bits of the ID field And adding the identifier of the receiver to the ID field according to the number, completing the MAP message, and transmitting the completed MAP message to the receiver.

According to a second aspect for achieving the object of the present invention, a method of acquiring an identifier from an ID field of a received MAP message in a method for identifying a resource of a receiver in a mobile communication system and comparing the identifier with an identifier of the receiver And if the identifier and the identifier of the receiver are different from each other, determining that the MAP message is not a MAP message for the receiver.

According to a third aspect of the present invention, in the apparatus of a transmitter for allocating resources in a mobile communication system, a bit number of an ID field for the receiver is determined in a MAP message to be transmitted to a receiver, and the bit of the ID field is determined. And a control unit for adding an identifier of the receiver to the ID field according to the number, and a transmitter for completing the MAP message and transmitting the completed MAP message to the receiver.

According to a fourth aspect for achieving the object of the present invention, in a device of a receiver for identifying a resource in a mobile communication system, a receiver for receiving a MAP message and an identifier in an ID field of the received MAP message are obtained, and the identifier and And comparing the identifiers of the receivers with each other and determining that the MAP message is not a MAP message for the receiver when the identifier and the identifier of the receiver are different from each other.

The present invention can additionally determine whether an error occurs by transmitting a base station's unique identifier (Station ID) to the reserved bit in the MAP message, and minimizing the probability of inaccuracy. Therefore, there is an advantage that the malfunction of the system due to the inaccuracy can be reduced.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, an apparatus and method for error detection of a MAP message in a mobile communication system will be described.

The present invention proposes an apparatus and method for additionally performing an error check when a false detection occurs when a terminal decodes a MAP message in a mobile communication system such as a broadband wireless communication system.

The present invention uses reserved bits present in the MAP message field for error detection of the MAP message. In general, reserved bits are present in the MAP message for the purpose of incorporating other technologies later, or for use of various conditional statements.

When inaccurate detection occurs in the terminal of the present invention, if a specific pattern transmission was previously promised at the transmitting / receiving end (for example, the base station / control station) in the reserved bit, the terminal additionally determines whether an error occurs and detects the inaccuracy. It can lower the probability of. In addition, if the unique identifier of the terminal is used in determining the pattern of the reserved bit, it is possible to further lower the probability of inaccuracy detection than when using the fixed pattern.

The present invention will be described by taking an example of a broadband wireless access communication system using an Orthogonal Frequency Division Multiplexing (OFDM) scheme or an Orthogonal Frequency Division Multiple Access (OFDMA) scheme. It can be easily applied to other communication systems that transmit.

The coding scheme of the MAP message is largely divided into two types. There are joint codings that encode all allocated MAP messages into one coding block, and separate codings that individually encode MAP messages assigned to each user. Although each coding method has different advantages and disadvantages, the present invention mainly considers separate coding which has advantages in terms of control overhead. However, the present invention can be applied to joint coding.

1 is a diagram illustrating a frame structure and a MAP structure of a broadband wireless communication system according to an embodiment of the present invention.

Referring to FIG. 1, the frame structure considered in the present invention is a hierarchical structure of a frame and a subframe. A frame having a period of 5 ms (crossing downlink and uplink) consists of eight subframes, and each subframe consists of a plurality of OFDMA symbols.

The MAP message is included in a downlink subframe and is transmitted separately from data traffic in a frequency division multiplexing (FDM) scheme. Herein, MAP denotes Advanced-MAP, and in the following description, MAP denotes MAP.

There are four types of MAP messages: Non-user specific, HARQ feedback, power control, and Assignment MAP messages. The MAP message considered in the present invention is an Assignment MAP message for allocating resources, and has a scheme of individually coding one or more users. Hereinafter, the MAP message indicates an Assignment MAP message.

Since the UEs in the active state do not know whether their MAPs have been allocated or not, they perform decoding on the n Assignment MAPs shown in FIG. 1.

Since the CRC of each MAP message is masked with an identifier of a corresponding user or a specific identifier, only a corresponding user or a corresponding user group can decode the MAP message in an error-free condition.

However, when an error occurs in channel decoding, an error pattern and an identifier pattern of an unintended user are combined in demasking and CRC checking to fail to detect an error in the CRC.

If such false detection occurs, HARQ feedback (ACK / NACK) information may be interfered with uplink transmission for downlink MAP, and interference may be caused when the data traffic is transmitted for uplink MAP. It can cause a lot of interference to users.

In the present invention, the additional error determination unit 370 of FIG. 3 is a block for checking whether the inaccuracy is detected and the error detection error of the CRC once again. Although error can be reconfirmed through various methods, the present invention proposes a method using a reservation bit in a MAP message.

Of course, if there are available bits other than the reserved bits, it is also possible to use the available bits. In the present invention, the reserved bit may indicate a reserved bit in the standard, and also indicates a bit that stores an identifier (Station ID) of the terminal, that is, an ID field of the terminal.

2 is a block diagram of a transmitter for generating an assignment MAP according to an embodiment of the present invention.

As shown in FIG. 2, a CRC is added after a MAP message for resource allocation of a corresponding user is generated. The user's identifier or specific identifier is masked in the CRC. Thereafter, channel encoding is performed and the encoded sequence string passes through the modulator. Finally, it is mapped to the physical channel through MIMO processing and transmitted.

Referring to FIG. 2, the base station includes a control unit 200 including a MAP message generator 210, a masked CRC adder 220 for masking a CRC, and a plurality of channel encoders 230-1 to 230. N), multiple QPSK modulators 240-1 through 240-N, precoder 245, pilot generator 247, multiple subcarrier mappers 250-1 through 250-N, multiple OFDM (Orthogonal Frequency Division Multiplexing) modulators 255-1 to 255-N, and a plurality of RF transmitters 260-1 to 260-N.

The MAP message generating unit 210 determines a terminal to transmit a MAP message, determines the number of reserved bits available in the MAP message to be transmitted to the terminal, and provides an identifier (Station ID) of the corresponding terminal to match the number of reserved bits. Store in the reserved bit. The detailed procedure will be described in FIG. 5.

The Masked CRC adder 220 masks an identifier or a specific identifier of the terminal to the CRC of the MAP message.

Each of the plurality of channel encoders 230-1 to 230 -N encodes a data bit string provided from the masked CRC adder 220. Each of the plurality of QPSK modulators 240-1 to 240 -N converts the encoded bit stream into complex QPSKs (complex symbols). Here, QPSK is an embodiment, and another modulation scheme may be used.

The precoder 245 performs precoding to remove intercell interference. The pilot generator 247 generates pilot signals and provides the pilot signals to the plurality of subcarrier mappers 250-1 to 250 -N.

In this case, when pilot signals are scrambled, the pilot generator 247 multiplies a pilot signal sequence by a scrambling code, and then, pilot signals multiplied by a scrambling code to the plurality of subcarrier mappers 250-1 through 250 -N. to provide.

Each of the plurality of subcarrier mappers 250-1 to 250 -N configures signals in a frequency domain by mapping transmission signals and pilot signals of a transmission path corresponding to the ones of the precoded transmission signals to subcarriers. .

Each of the plurality of OFDM modulators 255-1 through 255 -N converts signals in a frequency domain into signals in a time domain through an inverse fast fourier transform (IFFT) operation, and then inserts a cyclic prefix (CP). Configure baseband OFDM QPSKs.

Each of the plurality of RF transmitters 260-1 to 260 -N converts the baseband OFDM QPSKs into a signal of an RF band and then transmits the signal through an antenna.

In the above-described block configuration, the controller 200 may perform a function of the MAP message generator 210. In the present invention, it is shown to configure them separately to explain each function separately.

Therefore, in the case of actually implementing a product, all of the functions of the MAP message generating unit 210 may be configured to be processed by the controller 200, and only some of the functions may be configured to be processed by the controller 200. have.

In addition, the remaining functional blocks except for the controller 200 may be referred to as a transmitter. In addition, although not shown in the drawing, the base station includes a receiver which performs a reverse function of the transmitter.

3 is a block diagram of a receiver for receiving an assignment MAP according to an embodiment of the present invention.

As shown in FIG. 3, the terminal demaps a MAP allocated to a physical channel and then converts the MAP into a symbol string through a MIMO reception technique. Next, a demodulator and channel decoding are used to convert the bits into bit streams, and the CRC check and demasking processes are performed at the same time. Thereafter, additional error detection of the present invention is performed for the case where it is determined that there is no error in the CRC.

Referring to FIG. 3, the terminal includes a plurality of RF receivers 310-1 to 310 -N, a plurality of OFDM demodulators 320-1 to 320 -N, and a plurality of subcarrier dimappers 330-. 1 to 330-N), a plurality of QPSK demodulators 340-1 to 340-N, a plurality of channel decoders 350-1 to 350-N, a demasking CRC checker 360 and an additional error determiner ( 370). Here, the additional error determination unit 370 is included in the control unit 380.

Each of the plurality of RF receivers 310-1 to 310 -N converts an RF band signal received through an antenna into a baseband signal. Each of the plurality of OFDM demodulators 320-1 to 320 -N divides the baseband signal into OFDM QPSK units, removes CP, and then complex QPSK mapped to a frequency domain through a fast fourier transform (FFT) operation. Restore them.

Each of the plurality of QPSK demodulators 340-1 to 340 -N converts the complex QPSKs into a coded bit string by demodulating the complex QPSKs. Each of the plurality of channel decoders 350-1 to 350 -N decodes the encoded bit string and provides the decoded CRC check unit 360. If another modulation scheme is used instead of QPSK, the corresponding demodulation scheme may be used.

The demasking CRC checker 360 completes the MAP message from the decoded bit string, demasks the CRC of the MAP message using its ID (Station ID), and checks the CRC. If the CRC check passes, the MAP message is provided to the additional error determiner 370.

The additional error determination unit 370 determines the number of reserved bits included in the MAP message, and compares the reserved bits with an identifier (Station-ID) of the terminal to determine whether an inaccurate detection has occurred. This process will be described in detail in FIG.

In the above block configuration, the controller 380 may perform a function of the additional error determiner 370. In the present invention, it is shown to configure them separately to explain each function separately.

Therefore, when the product is actually implemented, all of the functions of the additional error determination unit 370 may be configured to be processed by the controller 380, and only some of the functions may be configured to be processed by the controller 380. have.

In addition, the remaining functional blocks except for the controller 380 may be referred to as a receiver. In addition, although not shown in the drawing, the terminal includes a transmitter that performs a reverse function of the receiver.

4 is a diagram illustrating a method of generating an assignment MAP message and a reservation bit shown in FIG. 2.

Referring to FIG. 4, the Assignment MAP message includes various information required for data allocation, such as type information, resource allocation information, and MIMO information, and also includes a reservation bit to maintain a specific size of the MAP message or for other reasons.

In the method proposed by the present invention, as shown in FIG. 4, when M + N reserved bits exist in one MAP message, the corresponding bits are filled with a user unique identifier or a specific identifier having a bit length L.

The reserved bits are sequentially filled from the LSB of the identifier bit or the reserved bits are sequentially filled from the MSB of the identifier bit. If M + N> L, the identifier bit is repeated in the form of cyclying to fill the reserved bit. Alternatively, the reserved bits remaining after filling the identifier bits may be padded with zeros. Alternatively, it can be padded with other letters or other numbers.

If M + N <L, add as many bits of identifier as can be added to the reserved bits (fill).

By using the above method, in case of inaccurate detection at the receiving end, additional error detection is possible regardless of whether or not an error occurs in the reserved bit. If the reserved bit is set to a certain value regardless of user or user group, additional detection is possible only when an error occurs in the reserved bit.

The location and length of the reserved bit vary depending on the type of the MAP message, and even the same type may change depending on the value of a field included in the message. For example, in the case of the MAP message shown in Table 1 below, the MAP message type is DL Basic Assignment MAP IE and has 2, 3, or 6 bits of reserved bits according to the MIMO encoder format.

Here, two bits indicate a case where the MIMO encoder format is horizontal encoding, three bits indicate a case of vertical encoding, and six bits indicate a case of space frequency block code (SFBC) or conjugate data repetition (CDR).

Syntax Size in bits Description / Notes DL_Basic_Assignment_MAP_IE () { - -    MAP IE Type 4 DL Basic Assignment MAP IE    I _Sizeoffset 5 Offset used to compute burst size index    MEF 2 MIMO encoder format

0b00: SFBC
0b01: Vertical encoding
0b10: Horizontal encoding
0b11: CDR    if (MEF == 0b01) { Parameters for vertical encoding M _t 3 Number of streams in transmission ( M _t <= N _t ),
N _t : Number of transmit antennas at the ABS.

0b000: 1 stream
0b001: 2 streams
0b010: 3 streams
0b011: 4 streams
0b100: 5 streams
0b101: 6 streams
0b110: 7 streams
0b111: 8 streams    Reserved One Reserved bit    } else if (MEF == 0b10) { Parameters for horizontal encoding       Si 4 Index used to identify the combination of the number of streams and the allocated pilot stream index in a transmission with MU-MIMO, and the modulation constellation of paired user in the case of 2 stream transmission
0b0000: 2 streams with PSI = stream1 and other modulation = QPSK
0b0001: 2 streams with PSI = stream1 and other modulation = 16QAM
0b0010: 2 streams with PSI = stream1 and other modulation = 64QAM
0b0011: 2 streams with PSI = stream1 and other modulation information not available
0b0100: 2 streams with PSI = stream2 and other modulation = QPSK
0b0101: 2 streams with PSI = stream2 and other modulation = 16QAM
0b0110: 2 streams with PSI = stream2 and other modulation = 64QAM
0b0111: 2 streams with PSI = stream2 and other modulation information not available
0b1000: 3 streams with PSI = stream1
0b1001: 3 streams with PSI = stream2
0b1010: 3 streams with PSI = stream3
0b1011: 4 streams with PSI = stream1
0b1100: 4 stream with PSI = stream2
0b1101: 4 streams with PSI = stream3
0b1110: 4 streams with PSI = stream4
0b1111: n / a    } else if (MEF == 0b00 || 0b11) {    Reserved 4 Reserved bits    }    Resource Index 11 5 MHz: 0 in first 2 MSB bits + 9 bits for resource index
10 MHz: 11 bits for resource index
20 MHz: 11 bits for resource index

Resource index includes location and allocation size    Long TTI Indicator One Indicates number of subframes spanned by the allocated resource.

0b0: 1 subframe (default)
0b1: 4 DL subframes for FDD or all DL subframes for TDD    HFA 3 HARQ Feedback Allocation    AI_SN One HARQ identifier sequence number    ACID 4 HARQ channel identifier    SPID 2 HARQ subpacket identifier for HARQ IR

0b00: 0
0b01: 1
0b10: 2
0b11: 3    CRV One Constellation Rearrangement Version

0b0: 0
0b1: 1    Reserved 2 Reserved bits } - -

5 is a flowchart illustrating a process of generating an Assignment MAP message according to an embodiment of the present invention.

Referring to FIG. 5, the process of FIG. 5 is performed at a transmitter and is generally performed at a base station. The following description will be described based on the base station. In the following description, the MAP message indicates the assignment MAP message.

When the base station determines a terminal to transmit the MAP message (step 510), the base station determines the number of reserved bits available in the MAP message for the terminal (step 515).

If the determined number of reserved bits is smaller than the number of IDs of the terminal (Station ID) (step 520), the bits corresponding to the number of additional bits are added to the reserved bits (step 525).

If the determined number of reserved bits is greater than the number of IDs of the terminal (Station ID) (step 520), the ID of the terminal is added to the reserved bits and the remaining reserved bits are padded with 0 or The identifier (Station ID) bit is repeatedly added (step 530).

Thereafter, the base station performs a CRC masking process (step 535), a channel encoding process (step 540), a modulation process (step 545), and a MIMO process, and then performs a transmission process (step 550). The transmission process after the CRC masking process is performed on other traffic data or control data to complete a downlink frame, and a downlink frame is transmitted during transmission.

The algorithm of the present invention is then terminated.

6 is a flowchart illustrating a process of receiving an Assignment MAP message according to an embodiment of the present invention.

As shown in FIG. 6, the process of FIG. 6 is performed in a receiver and generally performed in a terminal. The following will be described based on the terminal. In the following description, the MAP message indicates the assignment MAP message.

After receiving the downlink frame (step 603), MIMO processing (step 605), demodulation (step 610), channel decoding (step 615), and performing demasking and CRC check (step 620). If the MAP message is acquired from the link frame and the CRC check determines that there is no error in the MAP message (step 625), the following process (from step 630) is performed.

The terminal determines the number of reserved bits available in the MAP message (step 630).

Thereafter, if the determined number of reserved bits is smaller than the number of IDs of the terminal (Station ID) (step 640), the terminal acquires identifiers (Station ID) bits corresponding to the number of the reserved bits in the MAP message (step 645).

If the determined number of reserved bits is greater than the number of station ID bits of the terminal (step 640), the complete terminal identifier (Station ID) is obtained from the determined reservation bits (step 650).

Thereafter, it is checked whether the identifier of the terminal itself (Station ID) and the acquired terminal identifier (Station iD) are the same.

If the terminal's own identifier (Station ID) and the acquired terminal's identifier (Station iD) are the same as each other, the MAP message is determined to be a correct MAP message and the subsequent process is performed (step 665).

If the identifier of the terminal (Station ID) and the acquired terminal ID (Station iD) are not equal to each other, the terminal determines that the terminal is inaccurate detection (false detection), the corresponding process (for example, the corresponding MAP Message discard) (step 670).

The algorithm of the present invention is then terminated.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a view showing a frame structure and a MAP structure of a broadband wireless communication system according to an embodiment of the present invention;

2 is a block diagram of a transmitter for generating an Assignment MAP according to an embodiment of the present invention;

3 is a block diagram of a receiver for receiving an Assignment MAP according to an embodiment of the present invention;

4 is a diagram illustrating a method of generating an Assignment MAP message and a reservation bit shown in FIG. 2;

5 is a flowchart illustrating a process of generating an Assignment MAP message according to an embodiment of the present invention;

6 is a flowchart illustrating a process of receiving an Assignment MAP message according to an embodiment of the present invention.

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Claims (22)

In the resource allocation method of the transmitter in a mobile communication system, Determining the number of bits of the ID field for the receiver in a MAP message to be transmitted to the receiver; Adding an identifier of the receiver to the ID field according to the number of bits of the ID field and completing the MAP message; Transmitting the completed MAP message to the receiver. The method of claim 1, Adding an identifier of the receiver to the ID field according to the number of bits of the ID field, And if the number of bits of the ID field is smaller than the number of bits of the identifier, adding the same number of bits of the identifier as the number of bits of the ID field to the ID field. The method of claim 1, Adding an identifier of the receiver to the ID field according to the number of bits of the ID field, And if the number of bits of the ID field is the same as the number of bits of the identifier, adding the identifier to the ID field. The method of claim 1, Adding an identifier of the receiver to the ID field according to the number of bits of the ID field, If the number of bits of the ID field is greater than the number of bits of the identifier, add the identifier to the ID field, The remaining bits of the ID field is padded with a specific letter or number or repeatedly added to the identifier. The method of claim 1, The location of the ID field and the number of bits of the ID field vary depending on the type of the MAP message and the receiver. In the method of identifying resources of a receiver in a mobile communication system, Obtaining an identifier from an ID field of the received MAP message; Comparing the identifier with the identifier of the receiver; And determining that the MAP message is not a MAP message for the receiver when the identifier and the identifier of the receiver are different from each other. The method of claim 6, If the identifier and the identifier of the receiver are the same, determining the MAP message as a correct MAP message. The method of claim 6, Obtaining an identifier from the ID field of the received MAP message, And if the CRC check of the demasked MAP message is successful, an identifier is obtained from the ID field of the received MAP message. The method of claim 6, Comparing the identifier and the identifier of the receiver with each other, And if the number of bits of the ID field is smaller than the number of bits of the identifier, comparing the bits of the identifier with the same number of bits of the ID field. The method of claim 6, Comparing the identifier and the identifier of the receiver with each other, And if the number of bits of the ID field is equal to or greater than the number of bits of the identifier, comparing the identifier with the ID field. The method of claim 6, The location of the ID field and the number of bits of the ID field vary depending on the type of the MAP message and the receiver. In the apparatus of the transmitter for allocating resources in a mobile communication system, A controller for determining the number of bits of an ID field for the receiver in a MAP message to be transmitted to a receiver, and adding an identifier of the receiver to the ID field according to the number of bits of the ID field; And a transmitter for completing the MAP message and transmitting the completed MAP message to the receiver. The method of claim 12, The control unit, And if the number of bits of the ID field is smaller than the number of bits of the identifier, adding the same number of bits of the identifier as the number of bits of the ID field to the ID field. The method of claim 12, The control unit, And if the number of bits of the ID field is the same as the number of bits of the identifier, add the identifier to the ID field. The method of claim 12, The control unit, When the number of bits of the ID field is larger than the number of bits of the identifier, the identifier is added to the ID field, and the remaining bits of the ID field are padded with a specific letter or number or the identifier is repeatedly added. Device. The method of claim 12, The location of the ID field and the number of bits of the ID field varies depending on the type (Type) of the MAP message and the receiver. A device of a receiver for identifying a resource in a mobile communication system, A receiving unit for receiving a MAP message, Obtain an identifier from the ID field of the received MAP message, compare the identifier with the identifier of the receiver, and if the identifier and the identifier of the receiver are different, the MAP message is determined not to be a MAP message for the receiver. Apparatus comprising a control unit. The method of claim 17, The control unit, And when the identifier and the identifier of the receiver are the same, determine the MAP message as a correct MAP message. The method of claim 17, The control unit, And if the CRC check of the demasked MAP message performed by the receiver is successful, obtain an identifier from an ID field of the received MAP message. The method of claim 17, The control unit, And if the number of bits of the ID field is smaller than the number of bits of the identifier, comparing the bits of the identifier with the same number of bits of the ID field. The method of claim 17, The control unit, And if the number of bits of the ID field is equal to or greater than the number of bits of the identifier, comparing the identifier with the ID field. The method of claim 17, The location of the ID field and the number of bits of the ID field varies depending on the type (Type) of the MAP message and the receiver.

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