KR20090034610A - Map message constructing method and apparatus for enhancing map coverage in wireless communication system - Google Patents

Abstract

A method and an apparatus for comprising a MAP message are provided to reduce error probability of a map message by comprising a sub map by an FEC(Forward Error Correction) block size minimizing the FEC block error rate. A controller(510) determines a map information element recorded in the map of a transmission frame. The controller includes CID information and MCS level information in a map information element. A sub map process unit(520) compares the preset maximum FEC block size with the whole size of map information elements corresponding to MCS level with lowermost channel quality among the map information element. The sub map process unit groups the map information elements determined by a comparison result into the sub map group of the maximum FEC block size. A sub map comprising unit(530) comprises the map information elements of the sub map group to the sub map message.

Description

MAP Message Constructing Method and Apparatus for enhancing MAP coverage in Wireless Communication System}

The present invention relates to a method of constructing a map message in a wireless communication system, and more particularly, determines a map information element recorded in a map (MAP) of a transmission frame in a wireless communication system, and uses map information elements to determine map coverage. A method and apparatus for configuring a submap to enlarge.

The mobile WiMAX system is composed of a message-based medium access control (MAC) layer and an OFDMA-based PHY layer protocol. In the OFDMA physical layer, one frequency band is distributed over a plurality of subcarriers, and each subcarrier is orthogonal to other subcarriers. Due to this orthogonality, OFDMA can have a two-dimensional communication space-frequency and time space. In the cell, the base station assigns a burst to each terminal, and each burst is designated by a map information element (MAP IE). These map information elements are recorded in a map message to form one frame. This frame will be described in more detail.

1 is a diagram illustrating a frame structure in a wireless communication system supporting OFDMA.

Referring to FIG. 1, the frame is divided into a downlink subframe configured to transmit data from the base station to the terminal and an uplink subframe configured to transmit data from the terminal to the base station.

The downlink subframe includes a preamble, a frame control header (FCH), a downlink map (DL MAP), an uplink map (UL MAP), and a downlink burst (DL burst). Control symbols (ranging, ACK, CQI) and uplink bursts (UL Burst). A TTG (Transmit / receive Transition Gap), which is a guard region, exists between the downlink and the uplink.

The preamble is used to provide time and frequency synchronization and cell information to the terminal. The FCH contains frame information and information for decoding the downlink map. In the downlink map, information about the location and use of downlink bursts transmitted from the base station is recorded through the downlink map information element. In the uplink map, information on the location and use of uplink bursts transmitted by the terminals is recorded through the uplink map information element. In the frame configured as described above, the downlink map and the uplink map described above are transmitted in a message form. This map message will be described in more detail.

2 is a diagram illustrating a normal map message generated by a base station supporting OFDMA.

Referring to FIG. 2, in the frame, the normal map message includes a downlink map (DL MAP) and an uplink map (UL MAP), and the downlink map and the uplink map each user of the downlink bursts transmitted from the base station. It includes information, location information (DL MAP IE) of the corresponding burst, and map information element (MAP IE) informing uplink burst information (UL MAP IE) transmitted by users (terminals). Therefore, each user (terminal) can selectively receive the corresponding data by using the user information and burst location information included in the map information element. The configured normal map message is modulated in the physical layer and broadcasted to the user, and the numbers described in the normal map of FIG. 2 indicate the number of repetitions. Since these map messages are control messages related to the specific purpose (e.g., network entry) that this map message points to, the map messages must be decoded by the terminal to achieve this purpose.

Meanwhile, in an OFDMA-based base station, a packet is defined in a MAC layer, and at least one packet is included in constituting a burst of a map message, and one packet is packed with at least one Forward Error Correction (FEC) block. Is done. In this case, the probability that an error occurs in the packet is greater than the probability that an error occurs in the FEC block. In other words, if an error occurs in at least one FEC block, the packet including the FEC block is necessarily an error. In this way, it can be seen that the error probability increases as the size of the map message increases.

This map message is one of the bursts, and there is coverage for this map message. Coverage means a communication range having an acceptable error probability. Data coverage is related to quality of service. If data coverage is exceeded, data communication is not completely lost. However, if the map message is not received by the terminal, the terminal may not be able to decode the data burst and transmit the data of the terminal itself, resulting in a waste of system resources.

To solve this problem, the map message is encoded by the strongest modulation (QPSK 1/2 iteration 6) scheme to reduce the error probability. Because of this, the map message is rather large. The somewhat larger size of the map message increases the error probability of the map message when the terminal decodes it, thereby reducing the data transmission capacity in the downlink and reducing the map coverage.

On the other hand, the size of the map in the frame transmitted by the base station is proportional to the number of terminals covered by the base station. For example, as the number of terminals covered by the base station increases, the size of the map becomes larger. As described above, as the size of the map message increases, as described above, the error probability of the map message increases when the terminal decodes to decrease the data transmission capacity in the downlink and shorten the map coverage.

Therefore, there is a need for a study on a method for expanding communication coverage by effectively reducing the size of a map message.

The present invention was devised to meet the above requirements, and an object of the present invention is to reduce the burst size of a map message by using a submap in a wireless communication system to reduce an error probability of a map message generated when the terminal is decoded. In addition, the present invention provides a method and apparatus for constructing a map message for expanding coverage of a map message.

For the above purpose, a method of constructing a map message in a wireless communication system supporting OFDMA according to one embodiment of the present invention includes: (a) determining a map information element based on CID information and MCS level information for each terminal; (b) grouping the map information elements into submap groups having a maximum Forward Error Correction (FEC) block size until one frame becomes the maximum number of configurable submap messages; And (c) configuring map information elements of the submap group into submap messages.

In the wireless communication system supporting the OFDMA of one embodiment of the present invention, an apparatus constituting a map message determines a map information element recorded in a map of a transmission frame, and includes CID information and MCS level information in the map information element. A control unit including a; Among the map information elements, the total size of the map information elements corresponding to the MCS level having the lowest channel quality is compared with a preset maximum FEC (Forward Error Correction) block size, and the determined map information elements are determined according to the comparison result. A submap processor for grouping into submap groups having a maximum FEC block size; And a submap constructing unit configured to construct map information elements of the submap group into submap messages.

According to the present invention, a sub-map for a terminal of a low MCS level in a wireless communication system is configured with a FEC block size in which Forward Error Correction (FEC) block error rate (BLER) is minimum in Convolutional Turbo Codes (CTC). By reducing the probability of error and thereby expanding the coverage of the map message, there is an effect of increasing downlink data transmission capacity and efficiently using system resources.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments. For reference, in the following description, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention are omitted.

3 is a diagram illustrating a submap message created according to an embodiment of the present invention.

Referring to FIG. 3, a map MAP of a frame is composed of a compressed map or a normal map, and the map information elements MAP IEs of the compressed map or the normal map are submap pointer information elements. Assigned to a submap via Pointer IE, which includes submap information elements having burst allocation information in a frame.

This submap, unlike the normal map, is encoded in the most robust modulation (QPSK 1/2 iteration 6) scheme, for users with good channel conditions (high SINR), higher MCS levels (e.g. 16 QAM 1 / By applying 2), a constant modulation gain is obtained. For this modulation gain, the submap uses submap pointer information elements, which have different MCS levels for different submaps. At this time, the submap pointer information element corresponds to the overhead that was not present in the normal map. Therefore, the overall map size can be reduced by compromising the use of the submap pointer information element as an overhead and the modulation gain obtained by having each MAP level having a different MCS level.

In addition, the submap has a reduction structure that can reduce the overall map size through RCID. RCID stands for Reduced CID and is used in compressed map format. RCID exists in three forms-RCID 11, RCID 7, and RCID 3-. Each number represents a different LSB in the CID. Accordingly, the larger the number is, the less bits are saved, but the number of terminals included in the same type is increased. Therefore, by negotiating between this saved number of bits and the number of terminals, the overall map size can be reduced.

In constructing such a submap, in the present invention, first, the map information elements for the terminal having low channel quality (for example, QPSK 1/2 repetition 6) are small pieces as much as possible using the submap (SUB-DL-UL-MAP). Pack it. Packing into such small pieces can reduce the probability of error in the submap message when decoding at the terminal, thereby increasing the map coverage. In this case, the size of the pieces to be packed is, for example, when the size of one Forward Error Correction (FEC) block in CTC (Convolutional Turbo Codes) is the maximum (10 slots for QPSK 1/2), the corresponding FEC block error rate (BLER) is Minimum (see IEEE P802.16 ™ (Draft MAR 2007), 2007), which corresponds to the maximum FEC block size (ie 10 slots for QPSK 1/2).

The more submaps configured with this maximum FEC block size, the larger the grouping gain obtained, but the maximum number of submap messages that can be configured per frame is limited (eg, IEEE 802.16d / e is defined as three). Accordingly, in the present invention, a submap message is configured using map information elements corresponding to the lowest MCS level by the maximum number of submap messages (hereinafter, referred to as the maximum number) in one frame. For example, the IEEE 802.16d / It can also be three as in e. In this case, there may be a case in which the maximum number is not satisfied even with map information elements corresponding to the MCS level having the lowest channel quality. To this end, the present invention uses the remaining map information elements (except the map information elements corresponding to the MCS level corresponding to QPSK 1/2 repetition 6) except for the map information elements used when constructing the submap message. Submaps are configured to the maximum FEC block size by the number of submaps (M, the difference between the number of submaps already configured in the maximum number of submaps), but the coverage is expanded by reducing the map size.

Hereinafter, the apparatus and method for constructing a submap according to the present invention will be described in more detail.

4 is a diagram illustrating a configuration of a base station supporting OFDMA according to an embodiment of the present invention.

As shown in FIG. 4, the base station includes an interface 100, a band signal processing module 200, a transmission module 300, a reception module 600, a scheduler 500, and an antenna 400. It includes. The base station supports TDD and may be divided into a reception path and a transmission path.

In the reception path, the reception module 600 receives one or more radio signals transmitted by the terminals through the antenna 400 and converts the signal into a baseband signal. For example, the reception module 600 removes and amplifies noise from the above-described signal for data reception of the base station, down-converts the amplified signal to a baseband signal, and digitizes the down-converted baseband signal. The band signal processing module 200 extracts information or data bits from the digitized signal to perform demodulation, decoding, and error correction processes. The received information is transmitted to the adjacent wired / wireless network via the interface 100, or is transmitted to other terminals serviced by the base station through the transmission path again.

In the transmission path, the interface 100 receives voice, data, or control information from a control station or a wireless network, and the band signal processing module 200 encodes voice, data, or control information, and then transmits the transmission module 300. Will output The transmission module 300 modulates the encoded voice, data, or control information into a carrier signal having a desired transmission frequency or frequencies, amplifies the modulated carrier signal to a level suitable for transmission, and propagates to the air through the antenna 400. do.

On the other hand, the scheduler 500 controls the operation of the reception path and the transmission path and each component. In particular, in relation to the present invention, the scheduler 500 configures a maximum number of submap messages using map information elements for frames to be transmitted to each terminal, and configures each submap message to a maximum FEC block size. . The scheduler 500 will be described in more detail with reference to the accompanying drawings.

5 is a diagram illustrating a configuration of a scheduler according to an embodiment of the present invention.

As shown in FIG. 5, the scheduler 500 includes a control unit 510, a sub map processing unit 520, and a sub map configuration unit 530.

When the user packets are input from the upper layer to the MAC layer in the transmission path, the controller 510 schedules packets to be transmitted for each terminal based on the scheduling information. That is, the controller 510 determines the map information elements of the downlink map and the uplink map constituting the frame, and also determines the burst profile of the map information elements so as to be suitable for communicating with each terminal. The scheduling information includes CINR information through Channel Quality Indicator (CQI), CID list through Queue Management System (QMS), Burst Profile Management (BPM), and the like.

The submap processing unit 520 prioritizes the map information element having the MCS level having the lowest channel quality (eg, QPSK 1/2 repetition 6) into a submap group having a maximum FEC block size. In the grouping into the sub map group, the sub map group is grouped by a maximum number (for example, three) as map information elements corresponding to the MCS level having the lowest channel quality. However, there may be cases in which the submap group cannot be grouped by the maximum number only with map information elements corresponding to the MCS level having the lowest channel quality. In this case, the submap processor 520 may further serve as the number of remaining submap groups (the difference in the number of submap groups grouped into map information elements corresponding to the MCS level having the lowest channel quality at the maximum number). Group map groups. In this case, the remaining map information elements other than the previously grouped map information elements are grouped into submap groups having the maximum FEC block size, but grouped to reduce the size of the entire map message.

The submap configuration unit 530 configures each of the map information elements grouped by the submap processing unit 520 into submap messages using submap pointer information elements. This submap pointer information element contains location information of map information elements.

Hereinafter, the submap processor according to an embodiment of the present invention will be described in detail.

Referring again to FIG. 5, the submap processing unit 520 includes a list storage unit 521, a counting unit 522, a size comparison unit 523, a submap group unit 524, and a reduction gain process. Means 525, and map information element checking means 526.

The list storage means 521 receives and stores a list of map information elements determined by the controller 510. Each map information element includes CID information and MCS level information for each burst. Further, the list storage means 521 deletes from the list at least one map information element used to group the sub maps each time one sub map is grouped in the sub map group means 524. In addition, the list storing means 521 stores a list of map information elements used to group the number of the remaining sub map groups and the remaining sub map group, and the sub map group means 524 stores the remaining sub map group. Grouping the sub map group by the number of s deletes the map information elements used to group the sub map group from the list.

The counting means 522 counts the number of submap groups grouped by the submap grouping means 524. At this time, the counting means 522, when the number of sub-map groups counted in this way becomes the maximum number (for example, three) configurable in one frame, the sub-map configuration unit that the number of the grouped sub-map group is the maximum number 530 is notified. The counting means 522 also counts in reverse order by the number of remaining submap groups (ie, the difference between the maximum number and the number of submap groups already grouped). In this case, when the number of grouped submap groups reaches the maximum number (that is, when the number of remaining submap groups becomes zero as a result of counting in the reverse order), the number of the grouped submap groups becomes the maximum number. The map construction unit 530 is notified.

The size comparison means 523 receives map information elements corresponding to the MCS level having the lowest channel quality from the list storage means 521, and compares the total size of these map information elements with a preset maximum FEC block size. In the present invention, the maximum FEC block size is defined as the FEC block size in which the FEC block error rate (BLER) is the minimum in Convolutional Turbo Codes (CTC). In addition, the size comparison means 523 transmits the comparison result to the sub map group means 524, and the map information received by the sub map group means 524 from the list storage means 521 according to the comparison result. The elements are grouped into submap groups of the maximum FEC block size.

The sub map group means 524 submaps the received map information elements according to the comparison result of the size comparison means 523 with respect to the map information elements received from the list storage means 521. Group into groups At this time, the sub-map group means 524 groups the map information elements by a maximum number (for example, three) set in advance. More specifically, the submap group means 524 corresponds to the MCS level having the lowest channel quality when the total size of map information elements corresponding to the MCS level having the lowest channel quality is greater than the maximum FEC block size. Map information elements are grouped into submap groups of the maximum FEC block size. In addition, if the total size of map information elements corresponding to the MCS level having the lowest channel quality is smaller than the maximum FEC block size, the submap group means 524 corresponds to the MCS level having the lowest channel quality. Using the map information elements and the map information elements corresponding to the other MCS level received from the list storing means 521, they are grouped into a submap group having a maximum FEC block size. On the other hand, the sub map group means 524 map information elements corresponding to the other MCS level received from the list storage means 521 by the number M of the remaining sub map groups (MCS level having the lowest channel quality). Map information elements are excluded). In detail, the sub-map group means 524 receives the selected map size reducing element (eg, a specific MCS level or a specific RCID, etc.) from the reduction gain processing unit 525, and thus the other MCS level according to the selected map size reducing element. By using the map information elements corresponding to the group to the sub-map group of the maximum FEC block size.

The reduction gain processing means 525 determines a map size reduction factor that can greatly reduce the overall map size. This map size reduction factor is one of various MCS levels (eg, QPSK 1/2 iteration 4, QPSK 1/2 iteration 2, QPSK 1/2, ..., 64QAM 4/5, etc.) or one of various RCIDs. The reduction gain processing unit 525 calculates the reduction gains obtained by grouping each of the map size reduction elements, and then selects the map size reduction element having the largest reduction gain. The reduction gain processing means 525 forwards this selected map size reduction element to the sub map group means 524.

On the other hand, if the above-described reduction gain processing means 525 is implemented in an actual base station, much computation and time are required to obtain the reduction gains obtained by grouping each of the map size reduction elements. Therefore, in order to reduce the implementation complexity, if the number M of the remaining submap groups is 2 or 3, one selects a map size reduction element based on the MCS level, and transmits it to the submap group means 524, The other one selects a map size reduction element based on the RCID type and delivers it to the submap group means 524. In addition, if the number M of the remaining submap groups is 1, a first submap group grouping selected map information elements based on the MCS level, and a second grouping map information elements selected based on three RCID types. The reduction gain processing means 525 is configured to compare the second, third, and fourth submap groups with each other to select the group having the largest reduction gain as the map size reduction element.

An operation of the submap processor according to an exemplary embodiment of the present invention configured as described above will be described with reference to FIGS. 6 and 7.

Referring to FIG. 6, first, the list storing unit 521 receives and stores a list of map information elements for constructing a submap from the control unit 510 (S601). At this time, the list storage means 521 also stores the CID information and the MCS level for the map information element.

Next, the counting means 522 checks whether the number of submap groups grouped so far corresponds to the maximum number (S602). The number of sub-map groups indicates the number of map information elements corresponding to the MCS level having the lowest channel quality among the map information elements stored in the list storing means 521 grouped by the maximum FEC block size in step S605, which will be described later. The maximum number refers to the maximum number of submap messages configurable in one frame.

As a result of checking in step S602, if the maximum number is reached, the submap group means 524 resets the submap groups grouped by the maximum number using the map information elements corresponding to the MCS level having the lowest channel quality. In step S609, the map information elements corresponding to the MCS level having the lowest channel quality are regrouped into the maximum number of submap groups. By regrouping in this way, the size of the submap group can be grouped to the maximum FEC block size as much as possible.

As a result of checking in step S602, if the maximum number is not reached, the size comparison means 523 has the total size of map information elements corresponding to the MCS level having the lowest channel quality among the map information elements stored in the list storage means 521. And the maximum FEC block size are compared (S603). As defined above, in the present invention, the maximum FEC block size is an FEC block size in which the FEC block error rate (BLER) is the minimum in Convolutional Turbo Codes (CTC).

As a result of the comparison in step S603, if the total size of map information elements corresponding to the MCS level having the lowest channel quality is larger than the maximum FEC block size, the counting means 522 increases the number of submap groups by one, and the submap The grouping means 522 groups the map information elements corresponding to the MCS level having the lowest channel quality into submap groups having the maximum FEC block size (S604-S605). Then, the map information elements grouped into the sub-map group are deleted from the list of map information elements of the list storage means 521, and the flow proceeds to step S602 (S606).

However, as a result of the comparison in step S603, if the total size of map information elements corresponding to the MCS level having the lowest channel quality is smaller than the maximum FEC block size, the submap grouping means 522 may determine the MCS having the lowest channel quality. MCS level other than the map information elements corresponding to the MCS level having the lowest channel quality among the map information elements corresponding to the level and the map information elements stored in the list storing means 521 (for example, QPSK 1/2 repetition 6 (S607), using the map information elements of the MCS level other than the MCS level). Then, the list storing means 521 deletes the map information elements grouped into the sub map group in step S607 from the list (S608).

As such, the map information elements having the lowest MCS level (eg, QPSK 1/2 repetition 6) are first grouped into submap groups of the maximum FEC block size by the maximum number.

However, there may be cases in which the submap group cannot be grouped by the maximum number only with map information elements corresponding to the MCS level having the lowest channel quality. That is, even if grouping is performed in step S607, the number of submap groups does not reach the maximum number. In this case, the submap groups are further grouped by the number of remaining submap groups (M, the difference in the number of submap groups grouped into map information elements corresponding to the MCS level having the lowest channel quality at the maximum number). . At this time, the remaining map information elements except for the map information elements corresponding to the MCS level having the lowest channel quality are grouped into a submap group having a maximum FEC block size, but grouped to reduce the size of the entire map message.

Referring to FIG. 7, first, the list storing means 521 receives a list of remaining map information elements after updating in step S608 (S621). At this time, not only the CID information and the MCS level information for the map information element, but also the number N of submap groups grouped in steps S601 to S608 are received.

Subsequently, if the number M of the remaining submaps is at least one, the reduction gain processing unit 525 selects a map size reduction element that greatly reduces the overall map size, and reduces the number M of the remaining submap groups. In operation S623-S625, map information elements corresponding to the map size reduction element are grouped into submap groups having the maximum FEC block size. Then, the list storing means 521 deletes the map information elements grouped in step S625 from the list (S626). For example, if the map size reduction element is selected as having an MCS level of 64QAM 1/2, all map information elements higher than this MCS level are set to 64QAM 1/2 and grouped into submap groups. ) Deletes all the upper map information elements. In this way, even if the maximum number of submap groups cannot be grouped with the map information elements corresponding to the MCS level having the lowest channel quality, the map size reduction factor can reduce the total map size to the maximum for the remaining submap groups. Next, map information elements corresponding to the determined map size reduction element may be grouped into a submap group having a maximum FEC block size.

Through such a whole process, map information elements for submap configuration may be grouped into a maximum number of submap groups having a maximum FEC block size, and then the submap configuration unit 530 uses the submap pointer information elements. The grouped map information elements are configured as sub map messages.

FIG. 8 is a diagram illustrating a system level simulation result of a submap configured according to the present invention and a conventional normal map, and shows error probabilities of the submap and the normal map according to the distance between the base station and the terminal.

Referring to FIG. 8, it can be seen that as the distance increases, the error probability for both the submap and the normal map increases, but the gap between the error probability for the submap and the normal map increases. In the illustrated example, the transmission of the frame using the submap according to the present invention shows an error probability reduction of approximately 33% compared to the transmission of the frame using the normal map.

Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art to which the present invention pertains can implement the present invention in other specific forms without changing the technical spirit or essential features, The examples are to be understood in all respects as illustrative and not restrictive.

In addition, the scope of the present invention is specified by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. Should be interpreted as

1 is a diagram illustrating a frame structure in a wireless communication system supporting OFDMA.

2 is a diagram illustrating a normal map message generated at a base station supporting OFDMA.

3 illustrates a submap message created according to an embodiment of the present invention.

4 is a diagram illustrating a configuration of a base station supporting OFDMA according to an embodiment of the present invention.

5 is a diagram illustrating a configuration of a scheduler according to an embodiment of the present invention.

6 and 7 are flowcharts illustrating an operation of a sub map processor according to an exemplary embodiment of the present invention.

8 is a diagram showing simulation results at the system level for a submap constructed according to the present invention and a conventional normal map.

Explanation of symbols on the main parts of the drawings

500: scheduler 510: control unit

520: submap processing unit 521: list storage means

522: counting means 523: size comparison means

524: Submap group means 525: Reduced gain processing means

530: submap component

Claims (21)

A method of constructing a map message in a wireless communication system supporting OFDMA, (a) determining a map information element based on CID information and MCS level information for each terminal; (b) grouping the map information elements into submap groups having a maximum Forward Error Correction (FEC) block size until one frame becomes the maximum number of configurable submap messages; And and (c) constructing map information elements of the submap group into a submap message. According to claim 1, wherein step (b), And grouping the map information elements into submap groups having the largest Forward Error Correction (FEC) block size, starting from the map information element having the lowest MCS level. The method of claim 2, When the number of submap groups of the map information elements having the lowest MCS level among the map information elements becomes the number of the maximum submap messages, the group is regrouped into submap groups having the maximum Forward Error Correction (FEC) block size to be optimized. Map message composition method comprising the step of further comprising. The method of claim 2, If the number of submap groups is less than the maximum number of submap messages, and the total size of the map information element having the lowest MCS level is smaller than the maximum Forward Error Correction (FEC) block size, the MCS level has the lowest map information. A method of constructing a map message, characterized in that the remaining map information elements other than the element are grouped into a submap group having a maximum Forward Error Correction (FEC) block size. The method of claim 4, wherein And the remaining map information elements are further grouped by a number insufficient in the maximum number of submap messages. The method of claim 4, wherein The remaining map information elements select a map size reduction element having the greatest reduction gain for each MCS level or RCID (Reducing CID) type, and map information elements corresponding to the selected map size reduction element into submaps of the maximum FEC block size. Map message composition method characterized in that the grouping. The method of claim 4, wherein If the number is insufficient, the map information elements selected from the remaining map information elements based on the MCS level are grouped into a submap group having the maximum FEC block size, and the map information elements selected based on a reducing CID (RCID) type are included. A method of constructing a map message, characterized by grouping into submap groups having a maximum FEC block size. The method of claim 4, wherein If the number is insufficient, the size reduction gain of the map message obtained by grouping map information elements selected from the remaining map information elements based on the MCS level into a submap group having a maximum FEC block size, and reducing CID. And comparing the reduction gains obtained by grouping the selected map information elements into submap groups having the maximum FEC block size based on the type, and grouping them into the submap group having the largest reduction gain. The method of claim 1, wherein the maximum FEC block size, A method of constructing a map message, wherein the FEC block error rate (BLER) is the minimum FEC block size in Convolutional Turbo Codes (CTC). The method of claim 4, wherein the total size of the map information element having the lowest MCS level is: MCS level is QPSK 1/2, consisting of a size repeated six times. An apparatus for configuring a map message in a wireless communication system supporting OFDMA, A controller for determining a map information element recorded in a map of a transport frame and including CID information and MCS level information in the map information element; Among the map information elements, the total size of the map information elements corresponding to the MCS level having the lowest channel quality is compared with a preset maximum FEC (Forward Error Correction) block size, and the determined map information elements are determined according to the comparison result. A submap processor for grouping into submap groups having a maximum FEC block size; And And a submap constructing unit configured to construct map information elements of the submap group into submap messages. The method of claim 11, wherein the submap processing unit, And grouping the map information elements corresponding to the MCS level having the lowest channel quality into the submap group. The method of claim 11, wherein the submap processing unit, And mapping the submap group to the maximum FEC block size by the maximum number of submap messages configurable in the frame. The method of claim 11, wherein the MCS level having the lowest channel quality is MCS level is QPSK 1/2, the size of the map message repeater, characterized in that repeated six times. The method of claim 11, wherein the maximum FEC block size, And a FEC block size in which FEC block error rate (BLER) is minimum in Convolutional Turbo Codes (CTC). The method of claim 11, wherein the submap processing unit, And size comparison means for comparing the total size of the map information elements corresponding to the MCS level having the lowest channel quality among the map information elements with the maximum FEC block size. The method of claim 11, wherein the submap processing unit, And sub map group means for grouping the map information elements corresponding to the MCS level having the lowest channel quality into the sub map group. The method of claim 17, wherein the submap group means, If the number of submap groups is less than the maximum number of submap messages, and the total size of the map information element having the lowest MCS level is smaller than the maximum Forward Error Correction (FEC) block size, the MCS level has the lowest map information. A method of constructing a map message, characterized in that the remaining map information elements other than the element are grouped into a submap group having a maximum Forward Error Correction (FEC) block size. The method of claim 18, wherein the submap group means, And further grouping the remaining map information elements by a number less than the maximum number of submap messages. The method of claim 11, wherein the submap processing unit, And a reduction gain processing means for selecting a map size reduction element having the greatest reduction gain for each MCS level or RCID type from among the remaining map information elements. An apparatus for configuring a map message in a wireless communication system supporting OFDMA, A controller for determining a map information element recorded in a map of a transport frame and including CID information and MCS level information in the map information element; A submap processor for grouping the map information elements corresponding to the MCS level having the lowest channel quality among the map information elements into submap groups having a maximum Forward Error Correction (FEC) block size; And  And a submap constructing unit configured to construct map information elements of the submap group into submap messages.

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