KR20080090709A - Method of map construction in wireless communication system based on ofdma, and frame transmission apparatus by using the method - Google Patents

Abstract

A method for configuring a map in an OFDMA(Orthogonal Frequency Division Multiple Access)-based wireless communication system and a frame transmission apparatus are provided to decrease a size of an overall map message by adequately selecting an MCS and an RCID. A frame transmission apparatus includes a first sub map group selector(210), a reducing gain processor(220), a second sub map group selector(230), and a sub map determining unit(240). The first sub map group selector groups the CIDs with MCS levels higher than a reference MCS(Modulation and Coding Scheme) level. The reducing gain processor calculates the CID(Connection IDentifier) reducing gains for respective types of the RCID(Reducing CID) and selects the RCID type with the highest reducing gain. The second sub map group selector groups the CIDs corresponding to the selected RCID type to a second sub map group. The sub map determining unit determines to create the sub map, when one of the first and second sub map groups exists.

Description

Method of MAP Construction in Wireless Communication System based on OFDMA, and Frame transmission Apparatus by using the Method}

1 shows a frame structure in a typical OFDMA-based wireless communication system.

2 illustrates a normal map message prepared according to an embodiment of the present invention.

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

4 shows a configuration of an OFDMA-based frame transmission apparatus according to an embodiment of the present invention.

5 illustrates a configuration of the submap processor of FIG. 4.

FIG. 6 shows a configuration of the map configuration unit of FIG. 4.

7 is a flowchart illustrating a submap configuration procedure according to an embodiment of the present invention.

8A to 8D illustrate a submap configuration according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: scheduler

200: submap processing unit 210: first submap group setting unit

220: reduced gain processing unit 230: second submap group setting unit

240: Submap determination unit 250: MCS level table 250

300: map unit 310: sub map unit

320: normal map configuration unit 330: HARQ processing unit

The present invention relates to a map (MAP) configuration of a wireless communication system, and more particularly, to a map configuration method and a frame transmission apparatus using the same in an orthogonal frequency division multiplexing based wireless communication system.

One of the important advantages of the IEEE 802.16d / e system is the physical layer structure based on Orthogonal Frequency Division Multiple Access (OFDMA). In OFDMA, resources are allocated to users on a two-dimensional domain (frequency and time). This assignment provides users with frequency and time diversity gains simultaneously, and each user can obtain a different modulation and coding scheme (MCS).

In order to convey this information to the user, the OFDMA system needs a location indicator. In an IEEE 802.16d / e system, this information is included in a map (MAP) message and broadcast to the user.

1 shows a frame structure in a typical OFDMA-based wireless communication system.

As shown in FIG. 1, in the OFDMA standard, data transmission units in a conceptual frequency and time domain are represented as subchannels and symbols, respectively, and are the smallest that can be sent to one user (terminal). The data unit consists of one subchannel and one symbol.

The vertical axis represents the index of the subchannel, which is a frequency resource allocation unit, and one frame includes L + 1 subchannels from the sth to the (s + L) th.

The horizontal axis represents an index of an OFDM symbol, which is a time resource allocation unit, and one frame includes M + 1 downlink OFDM symbols and (k + M + 1) th from k th to (k + M) th It is composed of N uplink OFDM symbols up to (k + M + N). A TTG (Transmit / receive Transition Gap), which is a guard region, exists between the downlink and the uplink.

The frame of the OFDMA consists of a preamble (Preamble), a Frame Control Header (FCH), a DL-MAP, a UL-MAP, a downlink burst (DL-Burst) in the downlink period, and an uplink burst (uplink) in the uplink period. UL-Burst).

The preamble is used to provide time and frequency synchronization and cell information to the users. The FCH contains information for decoding the DL-MAP, and the DL-MAP includes downlink bursts transmitted from the base station. It has information that tells you whether it is data or in which area within the frame. Meanwhile, the UL-MAP includes information on uplink bursts transmitted by users (terminals).

In this case, since the map message is overhead, not data, system performance can be reduced, and as the number of bursts increases, the size of the map messages also increases.

Therefore, in order to solve the above-mentioned problem, if QAM 1/2 is used for the modulation of the map message using the characteristic that the normal map message has a fixed MCS (QPSK 1/2 in the worst case, repetition 6), The size of the message can be reduced to half of the map message modulated by QPSK 1/2 repetition 1. However, there is a problem in that a map message modulated by applying only the MCS having excellent efficiency is not able to correctly receive the map message at the receiving end when the channel environment of the receiving end is not good.

As described above, in order to compensate for the degradation of system performance due to the map message, the IEEE 802.16e standard has proposed a Sub-DL-UL-MAP message (hereinafter referred to as a sub map message) format. This standard allows sub-map messages to be modulated with various MCS levels. That is, the submap has various MCS levels using a pointer information element. However, since this pointer information element is also overhead, when the gain obtained through the various MCS levels is weak, the map size is larger than that of the normal map.

In addition, although the above-described submap can reduce the map size through RCID, it does not specifically indicate when, how, and what criteria to implement the map.

An object of the present invention is to provide a submap configuration method and a frame transmission apparatus using the same in a wireless communication system based on orthogonal frequency division multiplexing.

Another object of the present invention is to provide an adaptive map construction method and a frame transmission apparatus using the same in a wireless communication system based on orthogonal frequency division multiplexing.

Another object of the present invention is to define a reference MCS level for using a submap in a wireless communication system based on an orthogonal frequency division multiplexing access, and a map configuration method for adaptively using a normal map and a submap and a frame using the same. To provide a transmission device.

Another object of the present invention is to provide an appropriate threshold of RCID reduction gain and a threshold for the overall overhead ratio in an orthogonal frequency division multiplexing based wireless communication system to adaptively use normal maps and submaps. A method of constructing a map and a frame transmission apparatus using the same are provided.

For the above purpose, in the orthogonal frequency division multiplexing access-based wireless communication system of one embodiment of the present invention, a map configuration method includes (a) a CID that is equal to or higher than a reference MCS (Modulation and Coding Scheme) level among the received CIDs; Grouping to create a first submap group, (b) grouping a CID having a CID of a predetermined value or more to create a second submap group, and (c) creating a second submap group; And generating a normal map for a CID not included in a second sub map group, and (d) creating a sub map using pointer information elements for the first and second sub map groups. It is characterized by.

In addition, in a wireless communication system based on an orthogonal frequency division multiplexing connection according to another aspect of the present invention, a map configuration method includes: (a) Modulation and Coding Scheme (MCS) level information and CID reduction gain (Connection ID); Creating a submap group for the received CID using at least one of the information of Reducing Gain), (b) creating a submap using a pointer information element for the submap group, and generating the submap group It characterized in that it comprises a step of creating a normal map for the CID not included in.

On the other hand, in the orthogonal frequency division multiplexing access-based wireless communication system of one embodiment of the present invention, a frame transmission apparatus includes: a first submap group setting unit for grouping CIDs whose MCS level of a received CID is equal to or greater than a reference MCS level; A reduction gain processing unit for calculating a CID reducing gain for each type of Reducing CID and selecting the RCID type having the highest CID reduction gain, and grouping CIDs corresponding to the selected RCID type into a second submap group. And a second submap group setting unit and a submap determination unit for determining a submap generation when at least one group of the first submap group and the second submap group exists.

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.

2 illustrates a normal map message prepared according to an embodiment of the present invention.

As shown in FIG. 2, the normal map message in the frame includes DL-MAP and UL-MAP, and the DL-MAP and UL-MAP each user information of downlink bursts transmitted from the base station and location information of the corresponding burst. (DL-MAP IE) and MAP Information Element (MAP IE) indicating uplink burst information (UL-MAP IE) transmitted by users (terminals) are included. 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.

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

As shown in FIG. 3, a submap is constructed using a pointer information element in a compressed map, and the submap allocates burst position information using the map information element. Accordingly, the receiving end finds the corresponding submap using the pointer information element and receives its own data using the map information element of the corresponding submap.

In this case, when the channel state is good (High SINR), the submap may apply a higher MCS level than the MCS level (for example, QPSK 1/2 repetition 6) applied in the worst channel environment. To obtain this modulation gain, the submap uses pointer information elements, which provide different submaps so that the submaps have different MCS levels.

In this case, the submap pointer information element corresponds to overhead additionally generated by applying the submap. Thus, if the gain by higher MCS is not sufficient, the map size may be larger than the normal map.

In addition, the submap may reduce the map size by RCID (RCID; Reducing CID). In this embodiment, the RCID is divided into three types (RCID11, RCID7, and RCID3), and each number means a different LSB in each connection identifier (CID), which means that the larger the number, the number of saving bits. Decreases. Instead, the number of users included in the same type can be increased.

As described above, the entire map size can be reduced by configuring the submap using the MCS level and the RCID, which will be described in more detail with reference to FIGS. 4 to 7.

4 shows a configuration of an OFDMA-based frame transmission apparatus according to an embodiment of the present invention.

As shown in FIG. 4, the apparatus for transmitting a frame includes a scheduler 100 for scheduling a transport packet, a submap processor 200 for determining whether to apply a submap, a scheduler 100, and a submap processor 200. A map constructing unit 300 constituting a normal map or a sub map according to the instruction of the, and a transmission modem 400 for transmitting the configured map.

When the user packets are input from the upper layer into the medium access control (MAC) layer, the scheduler 100 schedules packets to be transmitted for each user based on the scheduling information. That is, the scheduler determines the map information elements of the downlink map (DL-MAP) and the uplink map (UL-MAP) constituting the frame and also maps the map information so as to be suitable for communicating with each personal subscriber station (PSS). Determine the burst profile of the element. Here, the scheduling information includes CINR information through a channel quality indicator (CQI), a CID list through a queue management system (QMS), and burst profile management (BPM).

The submap processor 200 determines whether a submap application is required among the scheduled packets. In this case, although the submap processor 200 is separately configured from the scheduler 100 in the present embodiment, the submap processor 200 may be located inside the scheduler 100 in another embodiment. A detailed description of the sub map processor 300 will be described in detail with reference to FIG. 5.

The map constructer 300 creates a map message by allocating the scheduled packet to a specific region of the time-frequency resource according to the instructions of the scheduler 100 and the submap processor 200. As such a map message, a normal map message and a sub map message are taken as an example, and the configuration thereof is as described with reference to FIGS. 2 and 3.

Meanwhile, the transmission modem 400 broadcasts to the PSS (not shown) by applying the corresponding MCS level according to the map message generated by the map configuration unit 300.

5 illustrates a configuration of the submap processor of FIG. 4.

As shown in FIG. 5, the submap processing unit 200 includes a first submap group setting unit 210, a reduction gain processing unit 220, a second submap group setting unit 230, and a submap. It includes a determination unit 240, and further includes an MCS level table (250).

The first submap group setting unit 210 receives the CINR for each CID, and determines that the channel environment is good if the MCS level assigned to the CINR is equal to or higher than the reference MCS level with reference to the MCS level table 250. And group the CIDs having the CINR into a first service map. In addition, the first submap group setting unit 210 includes a CINR receiving unit 212, an MSC level comparison unit 214, and a first submap group unit 216 in detail. The CINR receiver 212 receives the CINR for each CID through the CQI channel. The MCS level comparison unit 214 extracts the MCS level assigned to each CINR based on the MCS level table 250 that determines the MCS level according to the received CINR, and compares whether the MCS level is equal to or greater than the reference MCS level. When the MCS level comparison unit 214 performs the comparison for all CINRs, the first submap group unit 216 groups the first submap group for CIDs having CINRs equal to or higher than a reference MCS level according to the comparison result. do. The MCS level lower than the reference MCS level is applied to the first submap group. Preferably, the reference MCS is considered in consideration of the fact that the received CINR may vary greatly due to the delay of the CQI channel due to a sudden change in the channel environment. Apply MCS level 2 levels lower than level.

For example, when the reference MCS level is set to 64QAM 1/2, group CIDs of 64QAM 1/2 or more into a first submap, and apply an MCS level of 16QAM 3/4 or less, which is at least one step lower than 64QAM 1/2. do. In addition, it is preferable to apply 16QAM 1/2, which is two steps lower than 64QAM 1/2, in consideration of the fact that the received CINR may be greatly changed due to the delay of the CQI channel due to the drastic change in the channel environment. ) Searches for the RCID type with the highest overhead reduction rate and selects the RCID type. The reduced gain processor 220 includes a reduced gain calculator 222 and an RCID type selector 224. The reduction gain calculator 222 calculates a CID reducing gain for each RCID type. The calculation of the CID reduction gain is the same as that of Equation 1 to be described later, and will be described in more detail in Equation 1. When the CID reduction gain is calculated for each RCID type as described above, the RCID type selection unit 224 selects the RCID type having the largest CID reduction gain. In this embodiment, the RCID type suggests three types, for example, RCID 3, RCID 7, RCID 11, and the number following the RCID indicates a different number of bits for each CID.

The second submap group setting unit 230 groups the CIDs corresponding to the specific RCID type into the second submap group by using the CID reduction gain. The second sub map group setting unit 230 includes a reduction gain comparison unit 232 and a second sub map group 234. The reduction gain comparison unit 232 compares the CID reduction gain of the RCID type selected by the RCID type selection unit 224 with a preset threshold according to the channel environment, and the second submap group 234 determines the selected RCID type. If the CID reduction gain is higher than the threshold, the second submap group is set for the CID corresponding to the RCID type.

The submap determination unit 240 determines whether to create a submap based on the first submap group and the second submap group described above. The sub map determination unit 240 includes a group identification unit 242, an overhead calculation unit 244, and an overhead comparison unit 246. The group checking unit 242 checks whether at least one group of the above-described first submap group and second submap group exists. In this case, when no grouped CIDs exist, the use of a normal map is advantageous for reducing overhead, and thus no submap is applied. In addition, the overhead calculator 244 calculates an overhead ratio that is reduced when the submap is applied and calculates an overhead ratio when no submap is applied. In addition, the overhead comparison unit 246 compares the overhead ratio reduced when the calculated submap is applied with the overhead ratio when the submap is not applied, and the overhead ratio that is decreased when the submap is not applied is determined. If it is larger than the overhead ratio, the submap configuration is indicated. The comparison result of the overhead comparison unit 246 is displayed at a constant ratio as shown in Equation 2 to be described later.

FIG. 6 shows a configuration of the map configuration unit of FIG. 4.

As shown in FIG. 6, the map constructing unit 300 includes a normal map constructing unit 310 for creating a normal map message, a submap constructing unit 320 for creating a submap message, and a HARQ processing unit 330. It includes.

The normal map configuration unit 310 constructs a normal map by creating downlink burst information and uplink burst information using the map information element. This is omitted since it has already been described in detail in FIG.

The submap construction unit 320 configures a submap by assigning different MCS levels to CIDs included in the first submap group and / or the second submap group. This is omitted since it has already been described in detail in FIG. 3.

The HARQ processor 330 sets (resets binary 1) or resets (binaries 0) the HARQ ACK offset for the CID group to which the CID reduction gain is applied, that is, the second submap group. Since each PSS does not know the number of PSSs to which the MCS level is applied differently, it is not possible to properly set the HARQ ACK offset on the UL-MAP during uplink. Therefore, when using the HARQ processing unit 330, it is determined whether the CID group to which the CID reduction gain is applied when configuring the submap, and informs the PSS of the appropriate HARQ ACK offset.

The operation of the sub map processor and the map configuration unit configured as described above will be described with reference to FIGS. 7 and 8A to 8B.

7 is a flowchart illustrating a submap configuration procedure according to an embodiment of the present invention, and FIGS. 8A to 8D are diagrams sequentially illustrating a submap configuration according to an embodiment of the present invention.

For the sake of clarity, in the following description, it is assumed that there are only QPSK 1/2 and 16 QAM 1/2 allocated to the submap creation, and QPSK 1/2 is allocated to the normal map by default.

First, the CINR receiver 212 receives a CINR for each CID through the CQI channel (S701).

Subsequently, the MCS level comparison unit 214 refers to the MCS level table 250 and checks whether the MCS level corresponding to the received CINR is equal to or higher than the reference MCS level (S703). This confirmation is performed on all received CINRs. For example, step S703 is shown in Fig. 8A. Referring to FIG. 8A, map information elements of a normal map message are divided into blocks within an area A. Referring to FIG. In this case, each block corresponds to a map information element allocated to each CID. Of these blocks, diagonal blocks such as the area B are map information elements confirmed by performing the above-described step S703. That is, area B is a map information element of a CID that is equal to or greater than the reference MCS level (eg, 16 QAM 1/2).

As a result of the checking, if at least one exists, the first submap group unit 216 groups the first submap using the pointer information element to map information elements of the CID satisfying the step S703 (S705). In addition, an MCS level lower than the reference MCS level is applied to the first submap group. Preferably, an MCS level two levels lower than the reference MCS level is applied. For example, when the reference level MCS is 64QAM 1/2, 16QAM 1/2, which is two steps lower than 64QAM 1/2, is applied to the first submap group. Step S705 is illustrated in FIG. 8B. Referring to FIG. 8B, map information elements of the normal map message are partitioned into blocks within area A, and a first sub map message is shown in area D. FIG. At this time, the region C corresponds to the pointer information element, and the regions B inside the region D correspond to the map information elements grouped through step S705.

Subsequently, the reduced gain calculator 222 calculates the CID decrease gain for each RCID type (S707). The RCID types provided in this embodiment are RCID-11, RCID-7, and RCID-3, and the number following the RCID indicates a different number of bits for each CID. For example, if 16 bits are allocated to a CID, 5 bits are the same for RCID-11, 9 bits are the same for RCID-7, and 13 bits are the same for RCID-3. Then, the number of CIDs corresponding to RCID-11 will be much larger than the number of CIDs corresponding to RCID-3. Therefore, the relationship between the number of bits reduced for each RCID type and the number of CIDs corresponding to the RCID type will be properly compromised.

The reduced gain calculation unit 222 calculates the CID decrease gain for each RCID type through Equation 1 below.

[Equation 1]

Here, G _RC (%) represents a CID decrease gain, L _CID represents a CID length (eg, 16 bits), L _RCID represents a reduced CID length for each RCID type, and N _RC represents a map information element to which RCID is applied. P denotes the length of the HARQ and submap pointer information elements (e.g., 24 bits), O denotes the submap message overhead (e.g., 40 bits for DL, 56 bits for UL added) ), B _RC represents the total bits of the map information elements to which the RCID is applied.

Subsequently, the RCID type selection unit 224 selects an RCID type having the largest CID reduction gain among the RCID type reduction gains calculated in step S707, and removes the same bit of each CID according to the selected RCID type (S709).

This step S709 is illustrated in FIG. 8C. Referring to FIG. 8C, map information elements of the normal map message are divided into blocks within the area A. Further, map information elements of the area E and the area F which are displayed differently from FIG. 8B are further illustrated. The area E represents the same bit of the CID in the map information element, and the area F is the CID part from which the same bit is deleted.

Next, the reduction gain comparison unit 232 compares the CID reduction gain of the RCID type selected in step S709 with a predetermined threshold value T _CID (S711). This threshold may have a value of approximately 30% to 50% of the gain before CID reduction. However, these values are determined by the channel environment or the designer's will.

If the comparison result of step S711 is greater than or equal to the threshold value T _CID , the second sub map group unit 234 groups the map information elements of the CIDs corresponding to the selected RCID type into the second sub map group by using the pointer information element. (S713). For example, a second submap like FIG. 8D is created through the comparison of step S711 in FIG. 8C. Referring to FIG. 8D, the information elements of the normal map message are divided into blocks within area A. FIG. In this case, regions C and C2 correspond to pointer information elements, region D corresponds to a first submap message, and region G corresponds to a second submap message. In other words, step S713 is written as the second submap message for the area E in Fig. 8C using the pointer information element (area C2).

The group checking unit 242 checks whether at least one submap group grouped so far exists (S715). The group checking unit 242 may check four cases as follows. That is, 1) the first submap group and the second submap group exist, 2) the first submap group exists but the second submap group does not exist, and 3) the first submap group does not exist but the second submap group exists. The map group is present, 4) the first sub map group and the second sub map group are not present. At this time, 4) in the case where the first sub map group and the second sub map group do not exist, a normal map is configured without a sub map configuration (S725).

Next, the overhead calculator 244 calculates an overhead that is reduced when the first and / or second submap group is applied (S717). That is, assuming that the overhead ratio reduced by the submap groups is G _T (%), G _T (%) is expressed as in Equation 2 below.

[Equation 2]

Where L _N denotes the length of the normal map message modulated by the default MCS level (QPSK 1/2 repetition once), L _S denotes the length of the submap message, and L _CID denotes the CID length (eg, 16 bits), L _RCID represents the reduced CID length, B _N represents the total bits of the normal map message, B _S1 represents the sum of the total number of map information elements belonging to the first submap group, and B _RC Represents the sum of the total number of bits of the map information elements belonging to the second sub-map group, R _N represents the default MCS ratio (1/2, QPSK 1/2 repetition once), and R _S represents the first sub-map group a for indicates the MCS ratio of the sub-mAP message, N _RC is a second sub-map, indicates the number of map information element belonging to the group, P _G1 includes a first sub-map groups the length (e.g. the HARQ and the sub-map pointer information element for , represents a 24-bit), P _G2 is for HARQ and a second sub-map group Represents the probe map length of the pointer information element (yekeon versus 24 bits), O _G1 represents a first sub-map groups the map message overhead (if, for example, DL is 24-bit, 40-bit when the UL is added) , O _G2 denotes a map message overhead for the second submap group (eg, 40 bits in case of DL, 56 bits when UL is added), and G _T denotes a total gain obtained through the entire submap process.

Next, the overhead comparison unit 246 compares the overhead ratio G _T reduced when the first and / or second submap group is applied with the overhead ratio T _O when the submap is not applied (S719). ).

As a result of the comparison, if G _T is less than T _O , the normal map configuration unit 320 constructs a normal map without submap configuration (S725), and if G _T is greater than T _O , the first and / or confirmed in step S715. A submap is constructed using the second submap group (S721). In this case, CIDs not included in the first and / or second submap group are configured as normal maps (S725).

In step S721, the submap is configured as shown in FIG. That is, a submap is constructed using the pointer information element, and burst position information is assigned to the map information element of the submap.

Meanwhile, the HARQ processing unit 330 sets HARQ ACK offset (assigned binary 1) or resets (assigned binary 0) to a CID group to which CID reduction gain is applied, that is, a second submap group. In detail, it is determined whether HARQ is present in the second submap group in step S713. If HARQ is present in the second submap group, the HARQ ACK offset indicator field 1 and the HARQ ACK offset are set to 3 to indicate that the HARQ is present in the second submap group. Notifies the PSS of the HARQ ACK offset position for the CID corresponding to the submap group. However, if there is no HARQ, HARQ ACK offset indicator field 0 is set. That is, when the submap message is applied to the transmission frame according to the present embodiment, since the PSS corresponding to the CID of the second submap group cannot know the number of CIDs corresponding to the first submap group, HARQ on the UL-MAP You will not be able to set the appropriate ACK offset. In order to compensate for this, it is determined whether the HARQ ACK offset exists in the second submap group of the HARQ at the time of submap configuration, and informs the PSS of the CID belonging to the second submap group.

As described above, by configuring a normal map and / or a submap and applying the created map message to a frame transmitting apparatus, the submap proposed in the IEEE 802.16e standard can be concretely implemented, and the submap is an existing map message. It can be applied adaptively to reduce the map size of the transmission frame.

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.

According to the present invention, it is possible to contribute appropriately to the activation of the standard by presenting the submap message presented in the IEEE 802.16e standard and the application time thereof in detail.

In addition, according to the present invention, since the submap and / or normal map are generated through appropriate selection of modulation and coding scheme (MCS) level and / or reduced CID (RCID), the size of the entire map message can be reduced. There is an effect that can be effectively reduced.

In addition, according to the present invention, by presenting the thresholds necessary for the MCS level and RCID gain selection in detail, there is an effect that can be efficiently used the map message.

Claims (26)

(a) grouping a CID having a reference Modulation and Coding Scheme (MCS) level or higher among received CIDs to create a first submap group; (b) creating a second submap group by grouping CIDs whose Connection ID Reducing Gain is equal to or greater than a predetermined value; (c) creating a normal map for a CID not included in the first and second submap groups; And and (d) creating a submap for the first and second submap groups using a pointer information element as a submap in the orthogonal frequency division multiplexing access based wireless communication system. According to claim 1, wherein the step (a), Orthogonal frequency division, characterized by acquiring a carrier to interference and noise ratio (CINR) for each CID (connection ID) through a channel quality indicator (CQI), and grouping CIDs whose MCS level corresponding to the CINR is equal to or greater than a reference MCS level. Map Construction Method in Wireless Communication System Based on Multiplexed Access. According to claim 1, wherein step (b), Based on orthogonal frequency division multiplexing access, selecting a Reducing CID (RCID) type having the highest Connection ID Reducing Gain, and grouping the CIDs whose CID reduction gain of the selected RCID type is equal to or greater than a preset threshold. To configure a map in a wireless communication system. The method of claim 1, wherein step (d) Calculating the reduced overhead in the submap group and the overhead in applying the normal map, and creating the submap if the reduced overhead in the submap group is greater than the overhead in applying the normal map. A method for constructing a map in a wireless communication system based on orthogonal frequency division multiplexing access characterized by the above-mentioned. According to claim 1, After the step (d), (e) setting HARQ ACK offset to set if HARQ is present in the second submap group, and setting HARQ ACK offset to reset if HARQ is absent; How to configure a map in a communication system. (a) creating a submap group for a received CID using at least one of Modulation and Coding Scheme (MCS) level information and Connection ID Reducing Gain (CID) information; And (b) creating a submap using a pointer information element for the submap group, and generating a normal map for a CID not included in the submap group. Map configuration method based on wireless communication system. The method of claim 6, wherein the sub map group comprises a first sub map group, And the first sub-map group groups CIDs whose MCS level corresponding to the CINR of the received CID is equal to or greater than a reference MCS level. The method of claim 7, wherein MCS level corresponding to the CINR of the received CID is extracted from the MCS level table that determines the MCS level corresponding to the CINR map configuration in a wireless communication system based on orthogonal frequency division multiplexing access. The method of claim 6, wherein the sub map group comprises a second sub map group, The second submap group selects the RCID type having the highest CID reduction gain, and groups the CIDs whose CID reduction gain of the selected RCID type is greater than or equal to a preset threshold. How to configure maps on your system. The method of claim 9, wherein the RCID type, And RCID 3, RCID 7, and RCID 11, wherein a number after the RCID indicates a different number of bits between CIDs. The method of claim 6, wherein the CID reduction gain, A method for constructing a map in a wireless communication system based on orthogonal frequency division multiplexing access, characterized by the following equation.

Here, G _RC (%) represents the CID reduction gain, L _CID represents the CID length, L _RCID represents the reduced CID length, and N _RC represents the number of map information elements to which the RCID is applied. , P represents the length of the HARQ (Hybrid ARQ) and the sub map pointer information element (Sub MAP pointer IE), O represents the sub-map message overhead, B _RC represents the total bits of the map information elements to which the RCID is applied. . According to claim 6, wherein step (b), Calculating the reduced overhead in the submap group and the overhead in applying the normal map, and creating the submap when the reduced overhead in the submap group is larger than the overhead in applying the normal map. Map construction method in a wireless communication system based on orthogonal frequency division multiplexing access characterized in that the. According to claim 6, wherein step (b), Calculating the reduced overhead in the submap group and the overhead in applying the normal map, and creating the normal map when the reduced overhead in the submap group is less than the overhead in applying the normal map. A method for constructing a map in a wireless communication system based on orthogonal frequency division multiplexing access characterized by the above-mentioned. The method of claim 13, The overhead ratio reduced by the sub-map is represented by the following equation, the map configuration method in a wireless communication system based on orthogonal frequency division multiplexing access.

Where L _N is the length of a normal map message modulated by a default modulation and coding structure (MCS) level, L _S is the length of a submap message, L _CID is the length of the CID, and L _RCID is reduced. CID length, B _N is the total bits of the normal map message, B _S1 is the sum of the total number of map information elements belonging to the first sub-map group, B _RC is the total number of bits of the map information elements belonging to the second sub-map group Sum, R _N is the default MCS rate, R _S is the MCS rate of the submap message for the first submap group, N _RC is the number of map information elements belonging to the second submap group, and P _G1 is the first submap Length of HARQ and sub map pointer information element for a group, P _G2 is length of HARQ and sub map pointer information element for a second submap group, and O _G1 is the first sub map Map message overhead for a group, O _G2 is map message overhead for a second sub-map group, G _T represents the total gain obtained through the entire submap process. According to claim 6, wherein step (b), And generating a submap by applying an MCS level lower than the reference MCS level to the first submap group. According to claim 6, After the step (b), (c) If the HARQ is present in the second submap group, the HARQ ACK offset indicator field is set to three. If the HARQ is not present in the second submap group, the HARQ ACK offset indicator field is reset. And configuring the map in a wireless communication system based on orthogonal frequency division multiplexing access. A first submap group setting unit for grouping CIDs whose MCS level of the received CID is equal to or greater than the reference MCS level; A reduction gain processor configured to select a RCID type having the highest CID reduction gain by calculating a CID reducing gain for each RCID type; A second submap group setting unit for grouping CIDs corresponding to the selected RCID type into a second submap group; And And a submap determination unit for determining submap creation when at least one group of the first submap group and the second submap group exists, the frame in the orthogonal frequency division multiplexing access based wireless communication system. Transmission device. The method of claim 17, wherein the first sub map group setting unit, Receiving a carrier to interference and noise ratio (CINR) and if the MCS level assigned to the CINR is greater than or equal to the reference MCS level orthogonal frequency division, characterized in that to group the CIDs corresponding to the CINR into a first submap (MAP) group Frame transmission apparatus in a wireless communication system based on multiplexing access. The method of claim 17, wherein the device, And a map constructing unit including a submap constructing unit for creating a submap for the CID for which the submap making is determined, and a normal map constructing unit for creating a normal map for the CID for which the submap making is not determined. Frame transmission apparatus in orthogonal frequency division multiplexing based wireless communication system. The method of claim 19, wherein the sub map configuration unit, And generating a submap by applying an MCS level lower than the reference MCS level to the first submap group in the orthogonal frequency division multiplexing access based wireless communication system. The method of claim 17, wherein the device, And a HARQ processing unit for setting or resetting a HARQ (Hybrid ARQ) ACK offset. The method of claim 17, wherein the first sub map group setting unit, A CINR receiver configured to receive the CINR for each CID through a Channel Quality Indicator (CQI) channel; An MCS level comparison unit for comparing whether the MCS level allocated to the CINR is equal to or greater than a reference MCS level; And And a first submap group unit for grouping CIDs having a CINR equal to or higher than the reference MCS level into a first submap group according to the comparison result. The method of claim 17, wherein the reduced gain processing unit, A reduction gain calculator configured to calculate a CID reducing gain for each RCID type; And And an RCID type selector for selecting the RCID type having the largest CID reduction gain. The method of claim 23, wherein the RCID type, And RCID 3, RCID 7, and RCID 11, wherein a number after the RCID indicates a different number of bits between CIDs. The method of claim 17, wherein the second sub map group setting unit, A reduction gain comparison unit for comparing the CID reduction gain of the selected RCID type with a predetermined threshold value according to a channel environment; And Orthogonal frequency division multiplexing access comprising: a second submap group unit configured to set a second submap group for a CID corresponding to the RCID type when the CID reduction gain of the selected RCID type is higher than the threshold value; Frame transmission device in a wireless communication system based on. The method of claim 17, wherein the sub map determination unit, A group checking unit to check whether at least one of the first submap group or the second submap group exists; An overhead calculator for calculating an overhead ratio reduced by the identified submap groups and calculating an overhead ratio when no submap is applied; And The overhead rate reduced by the calculated submap groups and the overhead rate when no submap is applied are compared so that the overhead rate reduced by the submap groups is greater than the overhead rate when no submap is applied. And an overhead comparison unit indicating the submap configuration if large.

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