KR20080035416A - Method and apparatus for transmitting/receiving control segment bit map in an orthogonal frequency division multiple system - Google Patents

Abstract

A method and an apparatus for transmitting/receiving control segment information in an orthogonal frequency division multiple system are provided to enhance receiving reliability in a receiver by transmitting CRC(Cyclic Redundancy Check) information attached to an information bit of another messages. In a method for transmitting a control segment bitmap in a transmitter of an orthogonal frequency division multiple system, a message, which includes the control segment bitmap for representing whether or not whole control segments are utilized without CRC(Cyclic Redundancy Check) information(405), is generated. The message is transmitted to a wireless network. The message is PDCAM(Packet Data Control Assignment Message) transmitted through a first control channel.

Description

METHOD AND APPARATUS FOR TRANSMITTING / RECEIVING CONTROL SEGMENT BIT MAP IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLE SYSTEM}

1 is a diagram illustrating a resource allocation method in a general OFDM system.

2 illustrates an example of a control segment bit map indicating whether each segment is used in a control channel of a general OFDM system.

3 illustrates a method of transmitting a control segment bitmap through a control channel in a general OFDM system

4 is a diagram illustrating a method of transmitting a control segment bit map through a control channel in an OFDM system according to an embodiment of the present invention.

5 is a block diagram showing the configuration of a transmitting apparatus in an OFDM system according to an embodiment of the present invention.

6 is a flowchart illustrating a process of transmitting a control segment bit map in an OFDM system according to an embodiment of the present invention.

7 is a block diagram illustrating a configuration of a receiving apparatus in an OFDM system according to an embodiment of the present invention.

8 is a flowchart illustrating a process of receiving a control segment bit map in an OFDM system according to an embodiment of the present invention.

9 illustrates an example of transmitting an F-PDCAMCH on a first segment of a control channel in an OFDM system according to another embodiment of the present invention.

10 is a flowchart illustrating a process of transmitting a control segment bit map in an OFDM system according to another embodiment of the present invention.

11 is a flowchart illustrating a process of receiving a control segment bit map in an OFDM system according to another embodiment of the present invention.

The present invention relates to a method and apparatus for transmitting and receiving control information in an Orthogonal Frequency Division Multiplexing (OFDM) system, and more particularly, to a method and apparatus for transmitting and receiving control information while reducing resource waste in an OFDM system and a system thereof. It is about.

In general, a wireless communication system is a system developed for a case in which a fixed wired network cannot be connected to a terminal and used. Representative systems of such a wireless communication system include a mobile communication system, a wireless LAN, Wibro, and a mobile ad hoc.

 Unlike general wireless communication, mobile communication presupposes mobility of a user. The ultimate goal of mobile communication is to exchange information media at any time, anywhere, and anywhere using terminals such as mobile phones and pagers. In addition, with the rapid development of communication technology, the mobile communication system has reached the stage of providing a high-speed data service capable of transmitting a large amount of digital data such as an e-mail or a still image as well as a video using a mobile terminal as well as a general voice call service.

A representative example of a mobile communication system that provides a high speed data service is an OFDM system as one of mobile communication systems using a multi-carrier transmission scheme. In the transmission system of the OFDM system, a symbol sequence inputted in serial is converted in parallel, and each of them is modulated and transmitted through a plurality of subcarriers having mutual orthogonality. Since the early 1990s, a Very Large Scale Integration (VLSI) has been adopted. In line with the development of the technology, it began to attract attention. The transmission scheme of the OFDM system modulates data using a plurality of subcarriers, and each subcarrier maintains orthogonality to each other so that frequency-selective multipath is compared with a conventional single carrier modulation scheme. It has a strong characteristic on a frequency selective multipath fading channel, and is a transmission method suitable for a high speed packet data service such as a broadcast service.

FIG. 1 is a diagram illustrating a resource allocation method in a general OFDM system, which illustrates a method of using unused segments of a control channel to transmit encoding information of a data channel.

First, in FIG. 1, reference numeral 101 denotes a subcarrier resource allocated for transmission of a control channel, reference numeral 103 denotes a subcarrier resource allocated for transmission of a data channel, and reference numeral 105 denotes subcarrier resources of a control channel. It shows the unused surplus resources. The configuration of the control channel will be described in detail with reference to FIG. 2. The control channel indicated by reference numeral 101 in FIG. 1 is divided into control segments for transmitting a control message, and when the interval occupied by one control channel or data channel on the time axis is called a frame, the six control segments in FIG. Consists of Diversity gain can be obtained by hopping physical resources occupied by the control channel or the data channel on a frame basis.

The control channel transmits a control message regarding resource allocation information, in which all control segments may not be used. That is, in the example of FIG. 1, five control messages are used in the first frame, and one control segment 105 does not transmit the control message and thus no data is loaded. As shown in FIG. 1, a surplus resource among subcarrier resources of a control channel may be used for transmission of a data channel. In addition, in a typical OFDM system, a data packet is represented by coded bits that are channel coded using a convolution code or a turbo code. These coded bits are divided into subpackets for HARQ transmission, and each subpacket may be transmitted through surplus resources of a data channel and a control channel.

2 illustrates an example of a control segment bit map indicating whether each segment is used in a control channel of a general OFDM system. Whether each segment is used may be represented in the form of a bitmap or may be represented by the number of surplus sources. In the present invention, an embodiment will be described using a bitmap.

In FIG. 2, a control channel, that is, a block resource channel (BRCH), may be divided into a plurality of control segments, and FIG. 2 assumes four control segments 201, 203, 205, and 207 for convenience. The number of control segments may vary depending on the length of the message of the control channel. In FIG. 2, for example, messages FLAM and RLAM of the forward shared control channel (F-SCCH) are transmitted through each segment, and there may be an unused segment in every slot. Whether to use each segment is indicated through the control segment bit maps 211, 213, 215, and 217 (hereinafter referred to as "bit map"), where "1" in the bit map indicates that the segment is for transmission of the F-SCCH. "0" indicates that the segment is not used for transmission of the F-SCCH. Accordingly, the terminal may check the control segment that is not currently used by receiving the control segment bit map, and may receive data through the control segment when an unused control segment is allocated to the corresponding terminal. The unused control segment includes the resource of the control channel in the allocated resource in the FLAM message of the terminal to inform the terminal of the redundancy of the segment of the control channel.

The control segment bitmap is called a Packet Data Control Assignment Message (PDCAM). The number of control segments in the system can vary at specific periods. For example, while operating with three control segments for a certain period of time and five with the next cycle, the packet data control assignment message may be variable according to system requirements.

3 illustrates a method of transmitting a control segment bit map through a control channel in a general OFDM system.

The control segment bit map may be included in a message transmitted through the F-SCCH and transmitted to the terminal. For example, in FIG. 3, the existing forward link assignment message (FLAM) 301 may be transmitted through a predetermined control segment of the F-SCCH by adding CRC information 303 and through channel coding, for example, convolutional coding. Can be. In addition, the Packet Data Control Assignment Message (PDCAM) 311 may also be transmitted over a predetermined control segment of the F-SCCH by adding CRC information 313 and undergoing convolutional coding.

However, when the control segment bit map is transmitted through the method of FIG. 3, the information bits that can be transmitted through the F-SCCH are at least 17 bits, but the control segment bit map information transmitted through the PDCAM is about 3 to 5 bits. Therefore, the conventional method of transmitting the PDCAM including the control segment bit map through the F-SCCH consumes a lot of power to send a small amount of information, and there is a problem in that it does not use radio resources efficiently.

The present invention relates to a method and apparatus for transmitting and receiving and a system capable of reducing resource waste when transmitting control information in an OFDM system.

The present invention also relates to a method and apparatus for transmitting and receiving and a system capable of reducing radio resources required when transmitting a control segment bitmap through a control channel in an OFDM system.

The method of transmitting a control segment bitmap in a transmitter of an orthogonal frequency division multiplexing system according to the present invention comprises the steps of generating a message including a control segment bitmap indicating whether all control segments are used without CRC information, and generating the message using a wireless network. It characterized in that it comprises a process of transmitting to.

In addition, in the orthogonal frequency division multiplexing system according to the present invention, a transmitting apparatus for transmitting a control segment bitmap includes a controller for generating a message including a control segment bitmap indicating whether all control segments are used, without CRC information, and encoding the message. And a transmission module for modulating and transmitting the data to the wireless network.

In addition, the method of receiving a control segment bitmap in a receiver of an orthogonal frequency division multiplexing system according to the present invention receives a first message including a control segment bitmap indicating whether all control segments are used over a first control channel without CRC information. And receiving a second message including the CRC information on the information bits of the message through a second control channel.

In addition, the receiving apparatus for receiving the control segment bitmap of the orthogonal frequency division multiplexing system according to the present invention receives the first message including the control segment bitmap indicating whether the entire control segments are used over the first control channel without CRC information. And a receiving module for receiving a second message including the CRC information on the information bits of the message through a second control channel.

In addition, the method of receiving a control segment bitmap in a receiver of an orthogonal frequency division multiplexing system according to the present invention includes decoding a first control channel in a first control segment of all control segments of a control channel, and CRC of the decoded information. If the result is failure, decoding the second control channel in the first control segment; and receiving the message including the control segment bitmap when the decoded information of the second control channel exceeds a predetermined threshold. Characterized in that it comprises a.

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

4 illustrates a method of transmitting a control segment bit map through a control channel in an OFDM system according to an embodiment of the present invention.

First, in the embodiment of the present invention, it will be understood that the control channel includes the F-SCCH and a Forward Packet Data Control Assignment Message Channel (F-PDCAMCH) for transmitting the PDCAM. . In the embodiment of FIG. 4, the unused control segment of the control channel may be represented through bit map information as shown in FIG. 2, and a base station (not shown) transmits PDCAM through the F-PDCAMCH. The terminal receiving the F-PDCAMCH may check the unused control segment of the control channel from the PDCAM and receive data through the control segment.

In an embodiment according to an aspect of the present invention, after generating a CRC using PDCAM and FLAM / RLAM, a PDCAM is proposed to transmit without a CRC. In this case, the reliability of PDCAM can be guaranteed through CRC of FLAM / RLAM. An embodiment according to another aspect of the present invention proposes a method of transmitting PDCAM through an F-PDCAMCH and receiving PDCAM by an erasure detection method to be described later to ensure the reliability of the PDCAM.

First, an embodiment according to an aspect of the present invention will be described. In FIG. 4, the PDCAM 401 does not add a 24-bit CRC 313 like the conventional method described with reference to FIG. Is sent. In the present invention, the FLAM 403 of the F-SCCH is transmitted through convolutional coding with the CRC 405 generated together with the bitmap information of the PDCAM 401. In the present invention, the FLAM 403 will be described as an embodiment. However, the FLAM / RLAM of the corresponding terminal may be used as the message for generating the CRC together with the PDCAM. The reason why the CRC 313 is not added when the PDCAM 401 is transmitted as described above is that 3 to 5 bits of information bits (PDCAM 401) are too small to attach a 24-bit CRC to the PDCAM 401. Because it brings waste. However, in the present invention, since the CRC is not added to the PDCAM 401 when the F-PDCAMCH is transmitted, the CRC 405 added when the FLAM (17 bits) of the F-SCCH is transmitted, the PDCAM 401 and the FLAM (17 bits). By using to generate the reliability can be increased at the receiving end. In this case, the receiver performs a CRC check on the information bits of the F-PDCAMCH and the F-SCCH using the CRC bits obtained by decoding the F-SCCH.If there is no error as a result of the CRC check, both information bits can be trusted. have.

The sender schedules the user for data transmission. When transmitting a FLAM to a user scheduled in an arbitrary frame, it is determined whether a control channel is used, and if there is a control segment not in use, a user to transmit data through the unused control segment is determined. When transmitting FLAM to the determined user, a CRC is generated using PDCAM 401 and FLAM (17 bit) information and the FLAM is transmitted. In addition, FLAM is generated by generating CRC only with FLAM to users who do not transmit data through unused control segments.

Referring to an embodiment according to another aspect of the present invention, as shown in FIG. 4, the PDCAM may be transmitted as a segment of a control channel after block coding without attaching a CRC. In the embodiment according to the above aspect, the reception reliability of the PDCAM is guaranteed by using the CRC of another message (FLAM / RLAM). However, in the present embodiment, it is possible to select with the block coded PDCAM information in the demodulation process of the F-PDCAMCH. Choose the best information. In addition, the reception reliability of the PDCAM is guaranteed by comparing the selected information with a predetermined threshold to determine whether to use the decoded PDCAM.

FIG. 9 illustrates an example of transmitting an F-PDCAMCH through a first segment of a control channel in an OFDM system according to another embodiment of the present invention. This is, for example, the number of blocks of an F-SCCH broadcasted through an F-PBCCH. It is assumed that there are four.

Referring to FIG. 9, although the PDCAM information generated by block coding is located in the first segment 901 of the control channel, the segment in which the PDCAM information is located may be another segment, which is limited to the first segment. no. The length of the control segment bit map included in the PDCAM is the same as the number of segments of the entire control channel and may be variable. In the block coding of PDCAM for this purpose, the number of input bits is variable, but the number of output bits can be fixed to fit into one segment of the control channel. The modulation and demodulation method of the F-PDCAMCH may use the same method as the modulation and demodulation method used in the F-SCCH. 9, the first segment 901 of the control channel can be used for the transmission of the F-SCCH or F-PDCAMCH, F-PDCAMCH if the first segment 901 of the control channel is used for the transmission of the F-PDCAMCH PDCAM transmitted through is block coded and transmitted without CRC.

Hereinafter, the configuration and operation of a transmission apparatus according to the present invention will be described with reference to FIGS. 5, 6, and 10.

First, FIG. 5 is a block diagram showing the configuration of a transmitting apparatus in an OFDM system according to an embodiment of the present invention.

In the transmitting apparatus of FIG. 5, a transmitting module for generating an F-SCCH including an FLAM as an OFDM symbol and transmitting the same to a wireless network includes components 501 to 517. Although not shown, a transmission module for generating an F-PDCAMCH including PDCAM as an OFDM symbol and transmitting it to a wireless network generates an F-PDCAMCH transmitter 519 and generates an F-DCH as an OFDM symbol for transmission to a wireless network. As a transmission module, the F-DCH transmission unit 521 also includes components 501 to 517.

The controller 523 of FIG. 5 generates an F-SCCH including FLAM, an F-PDCAMCH including PDCAM, and an F-DCH including user data and transmits the same to the corresponding transmission module. At this time, the controller 523 includes a CRC inserter (not shown) to generate and generate CRC information for the information bits of the F-PDCAMCH and the F-SCCH or the information bits of the F-SCCH according to the method described with reference to FIG. 4. The CRC information is transmitted in addition to the FLAM of the F-SCCH, and is transmitted to the corresponding transmission module without adding the CRC to the PDCAM including the control segment bit map.

Hereinafter, a transmission module for transmitting the F-SCCH will be referred to as a first transmission module, a transmission module for transmitting the F-PDCAMCH, a second transmission module, and a transmission module for transmitting the F-DCH will be referred to as a third transmission module.

In the embodiment of FIG. 5, the symbols generated through the first to third transmission modules are multiplexed by the IFFT processor 513 to undergo IFFT. Accordingly, the second and third transmission modules may share the IFFT processor 513, the CP inserter 515, and the RF processor 517 with the first transmission module. Looking at the configuration of the first to third transmission module, the encoder 501 for encoding the information of the F-SCCH, F-PDCAMCH and F-DCH transmitted from the controller 523, and interleaving the encoded packet data An interleaver 503, a modulator 505 for modulating the interleaved packet data according to a predetermined modulation scheme, and a boundary tone inserter 507 for inserting a guard tone to reduce interference of out-of-band signals. And a pilot tone inserter 507 for inserting a pilot tone for channel estimation at the terminal.

In addition, the first to third transmission modules each include a spreader 511 for spreading an OFDM signal in a quadrature phase shift keying (QPSK) scheme, an IFFT processor 513 for converting a signal in a time domain into a signal in a frequency domain, and And a CP inserter 515 for inserting a cyclic prefix (CP) in front of OFDM data to prevent signal interference, and an RF processor 517 for up-converting the OFDM-inserted OFDM signal into an RF signal. do.

Accordingly, according to the configuration of FIG. 5, the PDCAM including the control segment bit map can be transmitted without adding a CRC, thereby reducing waste of radio resources. In addition, by generating CRC information for the information bits of the F-PDCAMCH and the F-SCCH together, and transmitting the generated CRC information to the FLAM of the F-SCCH, it is possible to increase the reliability of the PDCAM at the receiving end.

6 is a flowchart illustrating a process of transmitting a control segment bit map in an OFDM system according to an embodiment of the present invention.

First, the transmission process of FIG. 6 assumes a process of transmitting an F-PDCAMCH to a terminal assigned to an unused segment of the control channel (hereinafter, referred to as an “excess segment”).

In step 601 of FIG. 6, the controller 523 generates a control segment bit map indicating whether the entire control segments are used, and the generated bit map is block coded through the second transmitting module in step 603 and transmitted to the F-PDCAMCH. do. In step 605, the controller 523 generates CRC information using the PDCAM including the bitmap information together with the FLAM of the F-SCCH, and in step 607, the FLAM to which the generated CRC is added, is transmitted through the first transmission module. It is transmitted on the F-SCCH.

10 is a flowchart illustrating a process of transmitting a control segment bit map in an OFDM system according to another embodiment of the present invention.

The transmission process of FIG. 10 assumes a process of transmitting an F-PDCAMCH to a terminal assigned to an unused segment of a control channel. In step 1001 of FIG. 10, the controller 523 generates a control segment bit map indicating whether all of the control segments are used, and the generated control segment bit map is block coded through the second transmitting module in step 1003 to display the first control channel. It is transmitted through the F-PDCAMCH located in the first segment.

Hereinafter, the configuration and operation of a receiving apparatus according to an exemplary embodiment of the present invention will be described with reference to FIGS. 7, 8, and 11.

7 is a block diagram illustrating a configuration of a receiving apparatus in an OFDM system according to an embodiment of the present invention.

In the receiving apparatus of FIG. 7, the receiving module for receiving the F-SCCH including the FLAM from the wireless network as an OFDM symbol and restoring the original information includes the components 701 to 719. And an F-DCH receiver 721 as a reception module for receiving a data channel F-DCH from the wireless network as an OFDM symbol, and an F-PDCAMCH as a reception module for receiving F-PDCAMCH including PDCAM from the wireless network as an OFDM symbol. Receiving unit 723 also includes the components 707 to 719. Hereinafter, a transmission module for receiving an F-SCCH will be referred to as a first reception module, a reception module for receiving an F-PDCAMCH a second reception module, and a reception module for receiving an F-DCH will be referred to as a third reception module. In FIG. 7, the second and third receiving modules may share the first receiving module, the RF processor 701, the CP remover 703, and the FFT processor 705.

The controller 725 of FIG. 7 receives the F-SCCH including FLAM, the F-PDCAMCH including PDCAM and the F-DCH including user data, respectively, from the first to third receiving modules. The controller 725 includes a CRC checker (not shown) to perform a CRC check on the FLAM of the F-SCCH and the PDCAM of the F-PDCAMCH using the CRC information generated according to the method described with reference to FIG. 4. If the test is successful, the FLAM and PDCAM information is used.

The terminal having the reception device of FIG. 7 receives the control segment bitmap from the PDCAM, and receives the user data through the excess segment when the excess segment is allocated.

Looking at the configuration of the first to third receiving module, first, the RF processor 701 converts the received signal from the wireless network into a baseband signal, and converts it into a digital signal. The converted digital signal is transmitted to the CP remover 703, and the CP remover 703 removes the contaminated CP due to propagation delay and multipath from the received signal. The FFT processor 705 converts the received time domain signal into a frequency domain signal and outputs the signal. Meanwhile, in the present invention, the second and third receiving modules will be understood as a configuration including an RF processor 701, a CP remover 703, and an FFT processor 705.

Also, in the first to third receiving modules, the despreader 707 despreads the OFDM signal in the frequency domain, for example, QPSK despreads and outputs tones of each signal. This assumes that a signal is transmitted by QPSK spreading in the transmitting apparatus of FIG. 5. Therefore, when the spreading method such as 16 QAM, 64 QAM is different in the transmitting apparatus, a despreader corresponding to the spreading method is provided. Also, in the first to third receiving modules, the despreader 707 transfers the tones of the despread signals to the pilot tone extractor 709, and the pilot tone extractor 709 extracts the pilot tones from the tones of each signal. The signal is transmitted to the channel estimator 713, and the tones of the remaining signal are transmitted to the data tone extractor 711. The data tone extractor 711 extracts the data tone from the tones of the input signal and transmits the data tone to the demodulator 715. Meanwhile, the channel estimator 713 estimates a channel using a pilot tone, and the channel estimate is transmitted to a demodulator 715. The demodulator 715 demodulates the data tone using the channel estimate received from the channel estimator 713, and the demodulated signal is deinterleaved through the deinterleaver 717 and input to the decoder 719. The decoder 719 decodes the input signal.

Therefore, according to the configuration of FIG. 7, the first to third receiving modules restore the information of the F-SCCH, the F-PDCAMCH and the F-DCH to the original information, respectively, and the controller 725 controls the FLAM and F- of the F-SCCH. The CRC check on the PDCAM of the PDCAMCH is performed, and when the CRC result is successful, the received FLAM and the PDCAM are used, so that the reception reliability of the PDCAM can be maintained while receiving the PDCAM including the control segment bitmap with a small amount of information.

8 is a flowchart illustrating a process of receiving a control segment bit map in an OFDM system according to Embodiment 1 of the present invention.

In step 801, the first receiving module decodes the F-SCCH received from the wireless network. In operation 803, the third receiving module decodes the F-PDCAMCH received from the wireless network. In step 805, the controller 725 checks the information bits of the F-SCCH decoded in step 801 using the CRC appended to the FLAM of the F-SCCH. In step 807, the controller 725 checks whether the CRC test result of the step 805 is good or bad, and if it succeeds, the controller 725 uses the information of the decoded F-SCCH in step 809. On the other hand, if the CRC test result is determined to be failed in step 807, the controller 725 checks the information bits of the F-SCCH and F-PDCAM decoded in steps 801 and 803 using the CRC added to FLAM in step 811 and step 803. do. In step 813, the controller 725 checks whether the CRC check result of the step 811 is good or bad. If the result is successful, the controller 725 uses the decoded F-SCCH and F-PDCAMCH information. The control segment bitmap is checked from the PDCAMCH to receive user data from the information of the redundant segment and the F-SCCH allocated to the control segment bit map. On the other hand, if the CRC check result is found to be failed in step 813, the controller 725 discards the currently decoded F-SCCH and F-PDCAM information because they are not available. Meanwhile, in the embodiment of FIG. 8, the reason for performing the CRC check in the two steps as described above is that the operation of the terminal using the excess segment by receiving the control segment bitmap through the F-PDCAMCH is distinguished from the operation of the terminal not using the excess segment. Because it becomes.

In the receiving process of FIG. 8, step 803 may be performed before step 811. It decodes F-SCCH and performs CRC check using only the information of F-SCCH. If it fails, it decodes F-PDCAMCH and proceeds to step 811. Can be minimized.

11 is a flowchart illustrating a process of receiving a control segment bit map in an OFDM system according to another embodiment of the present invention.

Referring to FIG. 11, in step 1101, the first receiving module (see FIG. 7) decodes an F-SCCH received from a wireless network. In operation 1103, the controller 725 checks the information bits of the decoded F-SCCH using the CRC added to the FLAM of the F-SCCH. The controller 725 checks whether the CRC result is good or bad. If it is successful, the controller 725 proceeds to step 1105 and uses the information of the F-SCCH decoded in step 1101 and assumes no PDCAM information. The reception operation of the control segment bit map is terminated. On the other hand, if it is determined in step 1103 that the CRC result is failed, in step 1107 the third receiving module decodes the F-PDCAMCH received from the wireless network, and the controller 725 receives the block coded PDCAM information from the decoded F-PDCAMCH. As the best information that can be selected, the information with the largest power is selected. Thereafter, in step 1109, the controller 725 checks whether the power value of the selected information exceeds a threshold of erasure detection. When the power value of the selected information does not exceed the threshold of deletion detection in step 1109, the controller 725 does not use the PDCAM, and when the threshold is exceeded, the controller 725 determines the PDCAM information as reliable information. To use the decoded PDCAM information.

Meanwhile, when the embodiment of FIG. 11 is applied to the receiver configuration of FIG. 7, the F-PDCAMCH is transmitted through the first block (F-SCCH Block 0) of the F-SCCH as shown in the transmission example of FIG. It is also possible to receive via the first receiving module that receives the -SCCH. In this case, in FIG. 7, the third receiving module for separately receiving the F-PDCAMCH may be omitted.

In the above 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 defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, according to the present invention, it is possible to efficiently use radio resources by transmitting segments of a control channel not used in an OFDM system in the form of a bitmap through the F-PDCAMCH without CRC information.

Claims (11)

A method of transmitting a control segment bitmap in a transmitter of an orthogonal frequency division multiplexing system, Generating, without CRC information, a message including a control segment bit map indicating whether all control segments are used; And transmitting the message to a wireless network. The method of claim 1, And the message is a packet data control assignment message (PDCAM) transmitted through a first control channel. The method of claim 2, The first control channel is a forward shared control channel (F-SCCH), and the PDCAM is transmitted over at least one of the segments of the first control channel. The method of claim 3, wherein And the PDCAM is a first segment of the first control channel. The method of claim 2, And transmitting CRC information by using information bits of a forward link assignment message (FLAM) transmitted through the PDCAM and a second control channel. Way. The method of claim 5, wherein And adding the CRC information to the FLAM and transmitting it to a wireless network. The method of claim 1, The method of claim 1, further comprising block coding the information bits of the message. A transmitter for transmitting a control segment bitmap in an orthogonal frequency division multiplexing system, A controller for generating a message including a control segment bitmap indicating whether all control segments are used without CRC information; And a transmitting module for encoding and modulating the message and transmitting the encoded message to a wireless network. A method of receiving a control segment bitmap in a receiver of an orthogonal frequency division multiplexing system, Receiving, without CRC information, a first message including a control segment bit map indicating whether the entire control segments are used through the first control channel; And receiving a second message including the CRC information on the information bits of the message through a second control channel. A receiving device for receiving a control segment bitmap of an orthogonal frequency division multiplexing system, A receiving module for receiving a first message without CRC information including a control segment bit map indicating whether the entire control segments are used through the first control channel; And another receiving module for receiving a second message including the CRC information on the information bits of the message through a second control channel. A method of receiving a control segment bitmap in a receiver of an orthogonal frequency division multiplexing system, Decoding a first control channel in a first control segment of all control segments of the control channel, Decoding a second control channel in the first control segment when the CRC result of the decoded information is unsuccessful; And receiving the control segment bitmap as a message including the control segment bitmap when the decoded information of the second control channel exceeds a predetermined threshold.

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