JP5268204B2 - Downlink control message transmission method in cellular system - Google Patents

Description

   The present invention relates to a method of reducing complexity in detecting a control message received by a user equipment when a control message is transmitted to the user equipment or a user equipment group in a cellular system. . .

  In order to receive data from a base station in a cellular system, various information messages (hereinafter referred to as 'control messages') such as the location of resources where each terminal has data, modulation and coding methods, MIMO schemes, etc. Must be transmitted first. Such a control message should be present in each terminal that intends to receive data from the base station. Similarly, a method of grouping a plurality of terminals and transmitting a control message for each group can be considered. In this case, the size of each control message may vary depending on the information content and the modulation and coding method.

  On the other hand, when the base station transmits a control message of a different size to the terminal, it is possible to consider a method of informing the arrangement information, modulation and coding information in the frame of the control message in advance and a method of not informing the information. it can.

  In the former case, each terminal knows the position, modulation, and coding information of the corresponding control message in the frame, so that the corresponding control message can be detected easily, but additional information is further transmitted. There is a flaw that must be done.

  On the other hand, in the latter case, no additional information is transmitted, so overhead does not occur, but each terminal must perform blind detection to confirm its control message. Don't be. This means that all terminals must perform blind detection in all sections where control messages in the frame exist. On the other hand, when the number of cases to be considered when performing blind detection increases, the complexity and time for confirming the control message increase, leading to power loss of the terminal. Therefore, a method must be considered that can easily perform blind detection while minimizing overhead.

  The complexity of blind detection varies depending on how large the control message is configured and how many control messages should be considered. If all control messages have different lengths, the complexity increases. Therefore, the length of the control message is generally limited to several. For example, if a total of three sizes of 30 bits (bit), 60 bits, and 90 bits are allowed as the size of the control message, the complexity is reduced. If such a basic unit is defined as CB (Control Block) for convenience, in the above example, there can be control messages having three sizes of 1, 2 and 3CB (however, 1 CB = 30 bits). If).

However, even if the size of the control message is set in units of CB, the complexity of blind detection is very large. For example, in blind detection, when there are 3 types of CBs and a total of 4 control messages should be considered, there are 3 types of cases (CB is 1CB, 2CB or 3CB) when there is 1 control message. If there are 2 control messages, there are 3 ² types of cases, 3 if there are 3 control messages, 3 ³ types of cases, and 3 ⁴ cases if there are 4 control messages. There are cases.

If there are a total of 120 cases and there is no information about the above case in each terminal, each terminal can detect up to 120 times, and if there is a control message for the corresponding terminal, You can see if it contains information. In general, if the number of CB types is N and the maximum number of control messages is M, the maximum number of detections is sum (N ^m ). Since the number of detection executions causes deterioration in system performance, a method for reducing the number of detection executions must be considered.

  Meanwhile, frequency reuse is one method for increasing the number of channels per unit area in a cellular system. Since the strength of the radio wave gradually decreases as the distance increases, there is less interference between radio waves at a distance of a certain distance or more, and thus the same frequency channel can be used. Focusing on this principle, the same frequency can be used simultaneously in many regions so that the subscriber capacity is greatly increased. Such efficient use of frequency is called frequency reuse. A unit for dividing a region is called a cell (mobile communication cell), and switching of frequency channels between cells for maintaining a call is called handoff. Frequency reuse technology is essential for analog cellular mobile communication systems. The frequency reuse factor is one of the parameters representing the frequency efficiency in the cellular system. The frequency reuse rate is a value obtained by dividing the total number of cells (sectors) simultaneously using the same frequency in the multi-cell structure by the total number of cells (sectors) in the entire multi-cell structure.

  The frequency reuse rate of a 1G system (for example, an Advanced Mobile Phone System (AMPS)) is less than one. For example, in 7-cell frequency reuse, the frequency reuse rate is 1/7. The frequency reuse rate of 2G systems (e.g., Code Division Multiple Access (CDMA) and Time Division Multiple Access (TDMA)) has improved compared to 1G. For example, the frequency reuse ratio can reach from 1/4 to 1/3 in GSM (Global System for Mobile communication) in which Frequency Division Multiple Access (FDMA) and TDMA are combined. For 2G CDMA and 3G WCDMA systems, the frequency reuse factor can reach 1, increasing spectrum efficiency and reducing network deployment costs.

  When all sectors in one cell and all cells in one network use the same frequency, a frequency reuse factor of 1 can be obtained. However, the fact that a frequency reuse factor of 1 is obtained in a cellular network means that the signal reception performance of users at cell boundaries is reduced by interference from neighboring cells.

  In an Orthogonal Division Multiple Access (OFDMA) system, the channels are separated in subchannel units, so that signals are transmitted on the subchannels, and all channels are used as in 3G (CDMA 2000 or WCDMA). It ’s not. From these characteristics, the throughput of the user at the center of the cell and the user at the cell boundary (cell edge) can be improved at the same time. Specifically, since the central area of the cell is close to the base station, it is safe from co-channel interference from neighboring cells. Thus, the internal user at the center of the cell can use all available secondary channels. However, users at cell boundaries can use only some of the available total secondary channels. At the boundary of adjacent cells, frequencies are assigned so that each cell uses a different subchannel. Such a method is referred to as fractional frequency reuse (FFR).

  When FFR is applied to a cellular system, increasing the number of cases considered when performing the blind detection described above increases the complexity and time to confirm the control message, resulting in the Power loss occurs. Therefore, there is a need for a method that simplifies blind detection while minimizing overhead.

  The problem to be solved by the present invention is to provide a method capable of simplifying blind detection of a control message received by a user equipment from a base station while minimizing overhead.

  As one aspect of the present invention for solving the above problem, in a method in which a base station transmits a control message to a user equipment in a cellular system, the base station has an uplink ACK / NACK (Acknowledgement / Negative Acknowledgment) channel index. Whether the control message is allowed to be used implicitly, whether the user equipment corresponding to the control message can use the uplink ACK / NACK channel index implicitly, the information element of the control message (Information Element: IE), whether the control message is divided into a predetermined number of subblocks, MCS (Modulation and Co) applied to the control message ing Scheme) level, the size of the information element (allocated IE) of the control message after the MCS level is applied, and at least one of the frequency domain (Frequency Partition) in which the information element of the control message is present (criteria) And grouping a plurality of control messages for at least one user equipment, and transmitting the grouped control messages to each group generated by the grouping. A method is provided wherein the included control messages are identical in the at least one criterion.

  Each group may include a logically contiguous (physically contiguous) resource unit (Resource Unit).

  Information regarding the number of control messages included in each group or the size of the group may be transmitted through a non-user specific control message.

  In each group, the control messages included in each group may be rearranged according to the at least one criterion and transmitted.

  Fractional frequency reuse (FFR) is applied to the system, and the plurality of control messages may exist in at least one frequency region (FP) due to the partial frequency reuse.

  An MCS level can be set individually for each of the at least one frequency region.

  The same MCS level may be set in all of the at least one frequency region.

  The control message can only exist in a predetermined FP.

The control message may be present in all the at least one FP.
(Item 1)
A method in which a base station transmits a control message to a user equipment in a cellular system,
The base station determines whether an uplink ACK / NACK (Acknowledgement / Negative Acknowledgment) channel index is allowed to be implicitly used in the control message, and whether a user equipment corresponding to the control message receives an uplink ACK / NACK. Control whether the channel index can be used implicitly, the size of the information element (IE) of the control message, whether the control message is segmented into a predetermined number of sub-blocks MCS (Modulation and Coding Scheme) level applied to the message, the size of the information element (allocated IE) of the control message after applying the MCS level At least one of the frequency domain information element is present in the control message (Frequency Partition) based on (criteria), the steps of grouping a plurality of control messages for at least one user equipment (grouping The),
Transmitting the grouped control message;
Including
The control message transmission method, wherein control messages included in each group generated by the grouping are the same in the at least one criterion.
(Item 2)
The control message transmission method according to item 1, wherein each of the groups includes a resource unit that is logically continuous (physically contiguous) or physically continuous (physically contiguous).
(Item 3)
The control message transmission method according to item 1, wherein information regarding the number of control messages included in each group or the size of the group is transmitted through a non-user specific control message.
(Item 4)
The control message transmission method according to item 1, wherein in each group, control messages included in each group are rearranged and transmitted according to the at least one criterion.
(Item 5)
Item 3. The item according to Item 1, wherein fractional frequency reuse (FFR) is applied to the system, and the plurality of control messages exist in at least one frequency domain (Frequency Partitioning; FP) due to the partial frequency reuse. Control message transmission method.
(Item 6)
6. The control message transmission method according to item 5, wherein an MCS level is individually set for each of the at least one frequency region.
(Item 7)
6. The control message transmission method according to item 5, wherein all of the at least one frequency region are set to the same MCS level.
(Item 8)
6. The control message transmission method according to item 5, wherein the control message exists only in a predetermined frequency domain.
(Item 9)
6. The control message transmission method according to item 5, wherein the control message is present in all the at least one frequency domain.

  According to the present invention, the control message is rearranged according to a predetermined rule and transmitted, and before the control message is transmitted, the information regarding the rearrangement pattern of the control message is informed to the user in advance, thereby minimizing overhead. The blind detection can be simplified. Therefore, the complexity and time for confirming the control message can be reduced.

  The foregoing general description and the following detailed description of the present invention are exemplary only and are provided to aid the understanding of the claimed invention.

The accompanying drawings, which are included as part of the detailed description to assist in understanding the present invention, provide examples of the present invention and together with the detailed description explain the technical idea of the present invention.
It is a block diagram of the transmission resource for transmitting a control message. It is a figure which shows the example of a production | generation of control message structure information. It is a figure which shows an example of the pattern of the structure information of the control message which concerns on this invention. It is a figure which shows an example of the structure information of the control message for reducing the transmission effective bit number of control message structure information. FIG. 6 is a diagram illustrating a control message rearrangement pattern according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a control message rearrangement pattern according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a control message rearrangement pattern according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a control message rearrangement pattern according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a control message rearrangement pattern when FFR is applied according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a control message rearrangement pattern when FFR is applied according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a control message rearrangement pattern when FFR is applied according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a control message rearrangement pattern when FFR is applied according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a control message rearrangement pattern when FFR is applied according to an embodiment of the present invention. It is a block diagram which shows the structure of the device which can be applied to a base station and user equipment, and can perform the method demonstrated above.

  In the following examples, the constituent elements and features of the present invention are combined in a predetermined form. Each component or feature can be considered optional unless otherwise explicitly stated. Each component or feature may be in a form that is not combined with other components or features. In addition, some embodiments and / or features may be combined to form embodiments of the present invention. The order of operations described in the embodiments of the present invention can be changed. Some configurations and features of one embodiment may be included in other embodiments, and may replace corresponding configurations or features of other embodiments.

  In the description of the drawings, procedures or steps that obscure the gist of the present invention are omitted, and procedures or steps that can be understood by those skilled in the art are also omitted.

  The specific terms used in the following description are provided to help the understanding of the present invention, and the use of such specific terms can be changed to other forms without departing from the technical idea of the present invention. is there.

  The entire band used by the base station is divided into a predetermined number of subbands. When FFR (Fractional Frequency Reuse) is used, the entire band may be divided in advance by the base station, or may be divided for the convenience of transmitting a control message. Accordingly, the number of sub-bands generated by dividing the entire band can be varied as one or more, and each sub-band can be the same size or different size. When a resource area for receiving data by a terminal is allocated to a subband, the control message of the terminal exists in the subband.

  Depending on how large the control message is configured or how many control messages are to be considered, the complexity of blind detection varies. If all control messages have different lengths, the complexity increases. For this reason, the size of the control message is generally limited to several. For example, if a total of three sizes of 30 bits (bits), 60 bits, and 90 bits are allowed as the size of the control message, the complexity is greatly reduced. If such a basic unit is defined as CB (Control Block) for the sake of convenience, for example, there can be control messages having three sizes of 1CB, 2CB, and 3CB.

  On the other hand, after combining the control messages assigned to the resource area, the base station can rearrange the sizes of the control messages in descending order and transmit them sequentially. For example, if the four control messages have a size of 2CB, 1CB, 3CB, 3CB, respectively, these four control messages are transmitted in the order of 3CB, 3CB, 2CB, 1CB.

  FIG. 1 is a configuration diagram of transmission resources for transmitting a control message. As shown in FIG. 1, for convenience, the size of the control message is an integer multiple of CB (eg, 1CB, 2CB, 3CB, etc.), and the maximum control message size is NCB. In addition, it is assumed that resources having a total MCB size in the divided band can be allocated for transmission of control messages.

  Therefore, when the size of all messages is 1 CB, a maximum of M control messages can be transmitted in the divided band. In order to transmit a control message, when a control message having a size of 1 to NCB is combined and transmitted in a band to which a resource having an MCB size is allocated, various combinations exist. On the other hand, when the control messages are rearranged in descending order and transmitted from the base station, the number in that case is restrictive, and the pattern is also restrictive.

  Each of the cases where the size of the maximum control message in the divided area is 1 CB to NCB can be considered. If the size of the maximum control message is n (1 ≦ n ≦ N) CB, there can actually be 1 to n CB size control messages, and these 1 to n CB sizes are large. The control messages are transmitted in the descending order. In the present invention, information on a pattern in which control messages are rearranged is referred to as control message configuration information. The base station transmits the control message configuration information in advance before transmitting the control message.

  Hereinafter, a method for configuring control message configuration information according to the first embodiment of the present invention will be described.

  Here, in order to form the control message configuration information, it is assumed that the control message information exists in the entire divided area of the MCB size. That is, when the size of all control messages is smaller than MCB, it is assumed that 1 CB control message exists in the remaining part. FIG. 2 is a diagram illustrating an example of generation of control message configuration information. For example, FIG. 2 shows an example of configuration information generation for a case where M = 12, n = 3, and one control message of 3 CB and 2 CB size exists.

  Table 1 shows combinations of CB sizes when the maximum control message size is n.

上記の表１に開示された組み合わせにマッチングされる構成情報の種類の数はＭ値によって様々に存在する。図３は、本発明による制御メッセージの構成情報のパターンの一例を示す図である。便宜上、Ｍ＝１２、ｎ＝３とする場合、（３，２，１）の組み合わせ（これは、１ＣＢ、２ＣＢ及び３ＣＢ大きさの制御メッセージからなる制御メッセージ構成情報を示す。）を取り上げると、図３に示すようなパターンが存在する。

The number of types of configuration information matched with the combinations disclosed in Table 1 above varies depending on the M value. FIG. 3 is a diagram illustrating an example of a pattern of configuration information of a control message according to the present invention. For convenience, when M = 12, n = 3, a combination of (3, 2, 1) (this indicates control message configuration information including control messages of 1 CB, 2 CB, and 3 CB size) is taken. There is a pattern as shown in FIG.

  The configuration information shown in FIG. 3 is formed by a combination of (3, 2, 1), but how many 1CB, 2CB, and 3CB exist respectively depends on the M value. For convenience of explanation, in the combination, a CB that is next to the smallest CB is defined as a next lower CB, and a CB that is next to the next lower CB is defined as a lower CB. If there is a CB having a size larger than the next lower CB, the CB is defined by the above rule.

  For example, if the combination of [3, 2, 1, 1, 1, 1, 1, 1, 1] is considered, each number represents the size of CB, and the minimum size CB is 1 CB. CB is 2CB, which is the next largest after 1CB, and the next lower CB is 3CB, which is the next largest after 2CB.

  The method of generating the configuration information by the same CB combination is to set the remaining CB except for the smallest CB as one, and fill the remaining area with the smallest CB (for example, [3, 2,1,1,1,1,1,1,1]), the number of next lower CBs (for example, the number of 2CBs) can be increased (for example, [3, 2, 2, 1, 1, 1,1,1], [3,2,2,2,1,1,1], [3,2,2,1]).

  Such a process is successively repeated after the number of lower CBs (for example, the number of 3CBs) is gradually increased one by one.

  That is, there are two subordinate CB sizes (for example, 3CB), which are [3, 3, 2, 1, 1, 1, 1], and the number of subordinate CBs (2CB) increases one after another. After [3, 3, 2, 2, 1, 1], there are three lower CB sizes (3CB), and [3, 3, 3, 2, 1]. During this process, a specific CB combination may not appear depending on the M value.

  If the M value is 16, the CB combination (3) does not occur. If there are five 3CBs, the remaining one is always filled with 1CB, so the CB combination (3) is included in the (3, 1) combination. Therefore, when the size of the maximum control message listed above is n, a part of the combination of CB sizes forming the configuration information may be excluded depending on the M value.

  In this way, various patterns formed according to the above description are used as configuration information by N and M values.

  If the sizes of the five control messages are 3CB, 1CB, 2CB, 1CB, and 3CB, respectively, the descending order for these is [3, 3, 2, 1, 1]. The base station rearranges and transmits the control messages in this order. At this time, when pattern information of [3, 3, 2, 1, 1, 1, 1] is designated as configuration information, the terminal sequentially sends control messages to 3CB, 3CB, 2CB, 1CB, 1CB, 1CB, 1CB. It is determined whether or not its own control message exists. Since each terminal knows in what format the control message is transmitted from the base station, the complexity of decoding due to the size of the control message is reduced. In addition, since there is a high probability that a large control message is generated by the modulation and coding scheme, the complexity of demodulation and decoding can also be reduced by the method.

Example 1
If a total of 16 CBs are allocated to the sub-band generated by dividing the entire band for the control message, and the control message is allowed to have a size of 1 CB to 3 CB, the total three types of configuration information are represented in the following table. 2 can be configured. The base station may inform each terminal of index information formed with a total of 5 bits.

システムにおいて、一回に伝送されうる制御メッセージの最大個数が限定されることもある。このために、表１のパターンのそれぞれから一回に伝送されうる最大個数だけを分離してパターンを再構成し、再構成されたパターンにおいて同一のパターンは除去することによって、表１の構成情報を再構成することができる。

In the system, the maximum number of control messages that can be transmitted at one time may be limited. For this reason, only the maximum number that can be transmitted at one time is separated from each of the patterns in Table 1 to reconstruct the patterns, and the same pattern is removed from the reconstructed patterns, so that the configuration information in Table 1 is obtained. Can be reconfigured.

  For example, when the number of maximum control messages is limited to 6 in the first embodiment, the corresponding pattern and index can be obtained by reconstructing the results of Table 2. Table 3 below shows control message configuration information obtained by reconfiguring the results of Table 2 when the maximum number of control messages is limited to 6. That is, in the control message patterns in Table 2, six control messages are selected in order from the left side, each pattern is reconfigured, and a new index is assigned to each reconfigured pattern.

表３に示すように、制御メッセージの最大個数が６個に制限される場合、重複するパターンが存在するから、３０個のインデックスから２６個のインデックスと、インデックスの総個数が減少することができる。

As shown in Table 3, when the maximum number of control messages is limited to 6, there are overlapping patterns, so the total number of indexes can be reduced from 30 indexes to 26 indexes. .

The patterns shown in Table 3 can be partially combined to reduce the number of transmission effective bits. For example, the pattern [3, 3, 3, 2, 2, 2, 1] and the pattern [3, 3, 3, 2, 2, 1, 1, 1] are respectively the pattern [3, 3, 3, 2, 2, 2, b, 1]. That is, the underlined part in the pattern [3, 3, 3, 2 , 2 , 2 , 1] and the underlined part in the pattern [3, 3, 3, 2 , 2 , 1, 1 , 1] are replaced with b [3. , 3, 3, 2, 2, b, 1].

  FIG. 4 is a diagram illustrating an example of control message configuration information for reducing the number of transmission effective bits of the control message configuration information. As shown in FIG. 4, b means that the size is 1 or 2, so that the terminal has to try to decode this part to 2 CB and 1 CB respectively. There is. However, the total number of indexes can be reduced by performing an operation of combining the whole patterns using such a principle.

It is possible to extend such a principle and replace a specific part of the whole pattern with 'b'. For example, the pattern [3, 3, 3, 2, 2, 2, 1] and the pattern [3, 3, 3, 2, 2, 1, 1, 1] are [3, 3, 3, 2, b, 1]. That is, the pattern [3,3,3,2, 2,2, 1] and the pattern [3,3,3,2, 2,1,1, 1 ", replacing the underlined portion 'b' [3 , 3, 3, 2, b, 1]. In this case, in order to confirm the “b” portion, it is necessary to perform decoding of “2, 2”, “2, 1, 1” and “1, 1, 1, 1” three times. Therefore, the pattern [3, 3, 3, 2, 1, 1, 1, 1, 1] can also be considered as the same set. The system determines in advance how many CBs should be considered for the part indicated by 'b', or how many CBs should be considered for the part indicated by 'b' The total number of indexes can be reduced by notifying the terminal by the station.

  In using the configuration information formed based on such a principle, it is also possible to use a method in which the number of control messages is first notified to the terminal before the control message is transmitted, and indexing is performed using the reconfigured configuration information.

  The case where the entire band is divided into several sub-bands and transmitted through the sub-band to which the control message is assigned has been described above, but the control message is not necessarily configured for each sub-band. That is, even if the actual band is divided into several subbands for reasons such as FFR, the control message can be transmitted without depending on this. In this case, power boosting can be considered in order to transmit the control message with high reliability. Power boosting is very compatible with FFR. Here, the generation principle of the configuration information is the same as in the above description, except that the size M value of the subband and the number of control messages are considered in the entire band.

  On the other hand, in addition to the control message configuration information, the following additional message may be required.

If the entire band is divided into K subbands, information on whether or not a control message exists in each divided subband:
For example, the information can be transmitted in a bitmap format. If the entire band is divided into three, a bitmap consisting of 3 bits such as {b1, b2, b3} can be used. In this case, each bit b1, b2, b3 represents three subbands in order. Each bit of the bitmap can be defined to have a value of '1' if a control message is present in the corresponding subband and a value of '0' if it is not present, for example. . For example, when a control message exists only in the first subband, {b1, b2, b3} = {1, 0, 0}.

・ Band information:
Total number of control messages Maximum number of control messages allowed in the sub-band (M value)
Maximum number of control messages The number of control messages in each sub-band This content can be applied to the transmission of USCCH (Unicast Service Control Channel) that is progressing in the IEEE 802.16m standard. The USCCH is classified into user specific control information (User-Specific Control Information; USCI) and user non-specific control information (Non User-Specific Control Information; NUSCI). At this time, when the USCI is transmitted, each USCI is individually coded (separate coding). If there is no information when such USCI is transmitted, the terminal must perform blind detection. In this case, the base station transmits the configuration information using NUSCI or BCH (broadcast channel). Then, the base station rearranges the USCI according to its size and transmits it.

  In the above description, the configuration information is rearranged in descending order. However, the present invention can also be applied to the case where the configuration information is rearranged in ascending order.

  Hereinafter, a method for configuring a control message according to the second embodiment of the present invention will be described.

  There are various cases of control messages having a size of 1 CB to NCB in an MCB size band. However, since the base station according to the present invention transmits the control messages by rearranging the control messages in descending order according to the size, the number of possible cases is limited and the pattern is also limited. Therefore, the present invention proposes rearranging the control messages in descending order and generating a group according to the size of the control message. For example, after modulation and / or coding of the control message, a control message of 1 CB size may be grouped into Group 1 and a control message of 2 CB may be grouped into Group 2. Therefore, as many groups as the number of types of control message sizes are formed. The number of all possible groups can be considered while keeping the sum of the control message sizes below M.

Example 2
Table 4 below is an example of configuration information formation when the M value of the system is 5 and 1CB, 2CB, and 4CB are allowed as the size of the control message. In Table 4, Group 1 is a group of control messages having a size of 1 CB, Group 2 is a group of control messages having a size of 2 CB, and Group 3 is a group of control messages having a size of 4 CB.

表４からわかるように、任意のインデックスに該当する総制御メッセージの大きさは、Ｍ（本実施例では５）より小さいまたは等しい。上に例示したように、Ｇｒｏｕｐ １からＧｒｏｕｐ ３は、その値が降順あるいは昇順に並べ替えられるように順に連結されることができる。その他の様々な方法、例えば、総制御メッセージが占める大きさの順序（昇順または降順）なども考慮することができる。

As can be seen from Table 4, the size of the total control message corresponding to an arbitrary index is smaller than or equal to M (5 in this embodiment). As illustrated above, Group 1 to Group 3 can be linked in order so that their values are sorted in descending or ascending order. Various other methods can also be considered, such as the order of magnitude occupied by the total control message (ascending or descending order).

Example 3
Table 5 below shows the structure of the control message rearrangement pattern rearranged according to the size occupied by the total control message using Table 4. In Table 5, Group 1 represents a 1 CB sized control message group, Group 2 represents a 2 CB sized control message group, and Group 3 represents a 4 CB sized control message group. In Table 5, Group 1, Group 2, and Group 3 are displayed as G1, G2, and G3, respectively. The value in parentheses for each group represents the number of control messages belonging to that group.

実施例１における１３個の種類（表３のインデックス１〜１３）は、上記表５に全部示されている。したがって、制御メッセージ構成を知らせるためのインデックスを、表５における制御メッセージの総大きさ及びインデックス２の値を参照して順次に生成することができる。

The 13 types (indexes 1 to 13 in Table 3) in Example 1 are all shown in Table 5 above. Therefore, an index for informing the control message configuration can be sequentially generated with reference to the total size of the control message and the value of index 2 in Table 5.

Example 4
Meanwhile, according to another embodiment of the present invention, in order to reduce the number of effective bits of the transmitted index, the specific group n is excluded while maintaining the total size of the total control message to be M. All possible combinations by group can be considered. A control message corresponding to the excluded Group n may be included in blind decoding. For example, when n = 1, the terminal can perform blind decoding on a control message included in Group 1 (a group having a size of 1 CB). Table 6 below shows the configuration of the control message rearrangement pattern excluding Group1.

すなわち、表６で、インデックス１は、２ＣＢ大きさの制御メッセージが１個存在し、４ＣＢ大きさの制御メッセージが０個存在し、１ＣＢ大きさの制御メッセージは０乃至３個のうちのいずれかの個数が存在することを意味する。もし、基地局が制御メッセージを大きさ順に並べ替えて伝送するとすれば、Ｇｒｏｕｐ３、Ｇｒｏｕｐ２がまずデコーディングされた後、残った制御メッセージが総制御メッセージ大きさ（Ｍ）まで１ＣＢ単位にブラインドデコーディングされる。

That is, in Table 6, index 1 has one control message of 2 CB size, zero control message of 4 CB size, and one of 0 to 3 control messages of 1 CB size. Means that there are a number of. If the base station rearranges the control messages in order of size and transmits them, Group 3 and Group 2 are first decoded, and then the remaining control messages are blind-decoded in 1 CB units up to the total control message size (M). Is done.

  Meanwhile, in order to reduce the complexity of blind decoding in units of 1 CB, the base station can further transmit the following information in addition to the index.

-The total number of control messages included in Group 1 or the total size of Group 1-The total number of control messages existing in each Group or the total size of the area (Groups 1 to 3) actually occupied by the control message (Example: CB or RU (Resource Unit) size)
A method of performing indexing by notifying the terminal of the number of control messages or the size of resources used (for example, the number of CBs or the number of RUs) before transmitting a control message in using the configuration information formed based on such a principle. Can reduce the additional blind detection to be performed by the terminal by informing the terminal in advance of the total number of control messages currently configured or the size thereof.

On the other hand, the total number of control messages or the size thereof may vary depending on the system status. For example, the M value may be changed for reasons such as an increase in the system bandwidth or the number of control messages that must be transmitted to the terminal in the system. The method described above takes into account the number of all cases when the M value changes, so for different M values (M ₁ <M ₂ ), all cases where M ₁ is considered. the number is a subset on the number of all the cases considered in M _2. Therefore, after creating a table for the maximum M value allowed by the system, a method of reconstructing and using the table according to the change of M can be considered.

  For example, in the second embodiment, when M = 5 and the value of the entire table 4 (total size of control message 1CB to 5CB) is used, when the M value changes to 4, the total size of the control message is changed. The index can be reconstructed considering only 1 CB to 4 CB.

  On the other hand, such a matter is also applied to an example in which a specific group is blind-decoded in order to reduce the number of effective bits of an index. Considering the case where n = 1, that is, Group 1 (1 CB size group) is blind-decoded as in the third embodiment, the following Table 7 is obtained.

システムで要求されるＭ値が全ての端末に伝送される場合（例えば、放送チャネル（ｂｒｏａｄｃａｓｔ ｃｈａｎｎｅｌ）などを用いて）、当該Ｍ値に相応する制御メッセージの構成情報であるインデックス２が使用される。

When the M value required by the system is transmitted to all terminals (for example, using a broadcast channel), index 2 which is configuration information of a control message corresponding to the M value is used. .

  As another method using Table 6, if the total number of control messages configured in the current frame is N (0 ≦ N ≦ M), the corresponding band is obtained using N value instead of M value in Table 6. And the configuration information can be notified using the index 2 corresponding thereto. Table 8 below shows configuration information configured when the total number of control messages configured in the current frame is N.

すなわち、もし、Ｎ値が５であり、インデックス２が１の場合、構成情報はＧ１(０〜３)、Ｇ２(１)、Ｇ３(０)であることを意味するが、Ｎ値が３であり、インデックス２が１の場合の構成情報は、Ｇ１(０〜１)、Ｇ２(１)、Ｇ３(０)であることを意味する。このとき、Ｎ値が５の場合にインデックス２を表示するためには２ビットが必要であるが、Ｎが３の場合にインデックス２を表示するためには１ビットのみ必要になる。すなわち、Ｎ値が設定されることによって、インデックス２を表示するための有効ビット数は表８を用いて自動で定められるので、構成情報を示すために必要なビット数が減少する。

That is, if the N value is 5 and the index 2 is 1, it means that the configuration information is G1 (0-3), G2 (1), G3 (0), but the N value is 3. Yes, it means that the configuration information when index 2 is 1 is G1 (0-1), G2 (1), G3 (0). At this time, 2 bits are required to display index 2 when the N value is 5, but only 1 bit is required to display index 2 when N is 3. That is, by setting the N value, the number of effective bits for displaying the index 2 is automatically determined using Table 8, so that the number of bits necessary for indicating the configuration information is reduced.

  Meanwhile, Table 7 can be generated from Table 5.

  Since Group 1 is an object of blind decoding, it can be seen from Table 5 that the contents of Group 1 are changed and applied. Therefore, the same table is used for the case where the system performs transmission in consideration of the total number of cases as in the second embodiment and the case where the specific group is the target of blind decoding as in the third embodiment. It becomes possible.

  On the other hand, when considering the total number of possible cases and including some Groups in the blind decoding, the system adds the characteristics of such configuration information to all terminals in the BCH (Broadcast Channel) or NUSCI (Non− User Specific Control Information) or the like can be used for notification. In such a case, the configuration shown in Table 4 or Table 6 can be used very efficiently.

  On the other hand, in all the above methods, an index corresponding to a case where there is no control message can be omitted. For example, in the first to third embodiments, when the number of control messages in Group 1 to Group 3 is all 0, if the total number of control messages existing in each Group is known, the corresponding index becomes unnecessary. Become.

  The present invention can be applied to transmission of USCCH (Unicast Service Control Channels) proceeding in the IEEE 802.16m standard. USCCH is classified into USCI (User-Specific Control Information) and NUSCI (Non User-Specific Control Information). In this case, each USCI is individually coded and transmitted. Without any information regarding such USCI transmission, the terminal must perform blind detection. In this case, the base station transmits the configuration information described above using NUSCI or BCH (broadcast channel). The base station transmits USCIs sorted in descending order by size.

  Although the present invention has been described on the assumption that the configuration information is rearranged in descending order, the present invention can also be applied to the case where the configuration information is rearranged in ascending order.

Example 5
The M value may actually vary depending on the system configuration. Table 9 below shows various M-valued indexes that can be configured in the system. Here, G1, G2, G3, G4, and G5 indicate cases where the size of the control message is 1CB, 2CB, 4CB, 8CB, and 16CB, respectively. Since the terminal performs blind detection within the MCB range from the end of Group 2, Group 1 may be omitted.

一方、表９で、インデックス０においてＧｒｏｕｐ１はＧ１(０〜Ｍ)で表示される。現在伝送される制御メッセージの数（あるいは制御メッセージの総大きさ）を別途に伝送するとすれば、インデックス０に現れたＧｒｏｕｐ １のＧ１(０〜Ｍ)はＧ１(１〜Ｍ)のように表現されることができる。これは、制御メッセージの数（あるいは、制御メッセージの総大きさ）が０の場合、いかなる制御メッセージも送る必要がないということを意味するからである。実施例４で表７を表８に変換して得られた構成表がそのまま用いられることができる。すなわち、Ｍ値に代わりＮ値を考慮して、現在構成された総制御メッセージの数に基づいてインデックスが生成されることができる。

On the other hand, in Table 9, Group 1 is displayed as G1 (0 to M) at index 0. If the number of control messages currently transmitted (or the total size of control messages) is separately transmitted, G1 (0 to M) of Group 1 appearing at index 0 is expressed as G1 (1 to M). Can be done. This is because if the number of control messages (or the total size of the control messages) is 0, it means that no control messages need to be sent. The configuration table obtained by converting Table 7 into Table 8 in Example 4 can be used as it is. That is, an index can be generated based on the number of total control messages currently configured, considering the N value instead of the M value.

  The group setting method as described above can include the following various methods in addition to the size method.

  Downlink control messages are modulated and coded for actual transmission. At this time, in order to apply MCS (Modulation and Coding Scheme), the downlink control message may be segmented into several sub-blocks. For convenience, the downlink control message is referred to as a downlink control message IE (Information Element), and the separated subblock is referred to as an extended IE, which is actually transmitted after the MCS is applied. Let the control signal be referred to as an allocated IE. Also, the basic size unit of the allocation IE is referred to as MLRU (Minimum A-MAP Logical Resource Unit). Control messages are transmitted in groups according to specific purposes, and information about the grouping is transmitted. For example, downlink / uplink basic allocation IE (DL / UL basic assignment IE), uplink basic allocation IE (UL basic assignment IE), downlink / uplink group resource allocation IE (DL / UL group resource allocation IE), The downlink / uplink persistent IE (DL / UL persistent IE) or the like may be the downlink control message IE.

  The following cases can be considered as examples of grouping methods.

  In the first case, grouping is performed so that the control message is distinguished from a control message in which an uplink ACK / NACK channel index can be implicitly used and an exclusion message that is not. For example, control messages can be grouped into group 1 composed of downlink basic allocation IEs and group 2 composed of other types of IEs.

  The second case performs grouping so that the control messages are distinguished from user control messages that can implicitly use the uplink ACK / NACK channel index and control messages that are not. For example, control messages can be grouped into group 1 composed of downlink / uplink basic allocation IEs and group 2 composed of other types of IEs. In this case, the control message IE of one user can be transmitted continuously.

  In the first case and the second case above, an example of a method of “implicitly” using the ACK / NACK channel index includes using the order of control messages as the ACK / NACK channel index. That is, when such a grouping method is used, it is not necessary to perform additional signaling for the ACK / NACK channel index.

  The third case groups control messages according to the size of the control message IE. For example, control messages can be grouped into group 1 composed of control messages having a size of 56 bits and group 2 composed of control messages having a size of 90 bits.

  In the fourth case, grouping is performed by an extended IE and a non-extended IE. That is, the control messages can be grouped into a group 1 composed of extended IEs and a group 2 composed of other types of IEs (for example, basic IEs). Here, as described above, the extended IE is generated by separating the original control message into a plurality when the information amount of the original control message exceeds the basic control message length allowed by the system. A sub-block. In this case, the plurality of sub-blocks can be transmitted continuously.

  In the fifth case, grouping is performed according to the MCS level. For example, control messages are grouped into group 1 composed of control messages whose MCS level is QPSK (Quadrature Phase Shift Keying) 1/2 and group 2 composed of control messages whose MCS level is QPSK 1/8. Can be

  In the sixth case, grouping is performed according to the size of the allocated IE. For example, control messages can be grouped into group 1 composed of 2MLRU and group 2 composed of 4MLRU. Here, the allocation IE means an IE that is actually allocated to the resource area after the MCS is applied to the control message as described above.

  In the seventh case, the grouping methods according to the above cases 1 to 6 are combined and used. For example, after the control messages are grouped by the third case, the fifth case can be applied to the group generated by the third case. For example, the control message is a group 1 composed of control messages having a size of 56 bits and an MCS level of QPSK1 / 2, and a control message having a size of 56 bits and an MCS level of QPSK1 / 8. Group 2, which is 90 bits in size, and group 3, which is composed of control messages whose MCS level is QPSK1 / 2, is 90 bits in size, and MCS level is QPSK1 / 2. It can be grouped into group 4 composed of control messages.

  The number of groups described above can vary from case to case, and its purpose can vary in many ways other than in the above method.

Example 6
In addition to the size, the grouping method can be performed according to an MCS (Modulation and Coding Scheme) level. That is, blind detection can be performed by performing grouping according to the MCS level of the control message and informing the terminal of the number of control messages for each group.

  For example, when the control message can be modulated / demodulated into QPSK (Quadrature Phase Shift Keying) 1/16 (MCS4), QPSK1 / 8 (MCS3), QPSK1 / 4 (MCS2), and QPSK1 / 2 (MCS1), An index using configuration information indicating how many control messages exist for each MCS level is generated and transmitted.

  On the other hand, when the base station transmits configuration information according to the size of the control message, the base station sorts by MCS level in each group divided by size (reordered from MCS1 to MCS4, or Blind detection can be made simpler by transmitting (reordering from MCS4 to MCS1). On the other hand, when a group is configured for each MCS level, the blind detection can be simplified by rearranging by size within the group (rearranged in descending or ascending order) and transmitting.

  On the other hand, in the group transmission, the number of actual group control messages may be directly signaled.

  As an example of the control message described above, an A-MAP (Advanced Map) IE (Information Element) of the IEEE 802.16m system can be considered. If the modulation / demodulation coding is applied to the A-MAP IE, an A-MAP resource allocation unit (hereinafter referred to as “A-MAP IE allocation unit”) that is actually allocated to the A-MAP channel. When groups are configured according to size, the sizes of A-MAP IE allocation units existing in each group can be set to be the same. FIG. 5 is a diagram illustrating a control message rearrangement pattern according to an embodiment of the present invention. As shown in FIG. 5, after modulation / demodulation coding is applied, A-MAP IE allocation units are rearranged according to size, and A-MAP IE allocation units of the same size can form one group.

  In addition, after the modulation / demodulation coding is applied to the A-MAP IE, the A-MAP IE allocation units that are actually allocated to the A-MAP channel are rearranged according to size, and the A-MAP IE allocation unit having the same size is included in the A-MAP IE allocation unit. The A-MAP IE allocation units can be rearranged according to MCS levels.

  FIG. 6 is a diagram illustrating a control message rearrangement pattern according to an embodiment of the present invention. As shown in FIG. 6, A-MAP IE allocation units having the same MCS level and the same size can be grouped. A-MAP IE exists in the size of 1MLRU (Minimum A-MAP Logical Resource Unit) and 2MLRU, and QPSK1 / 2 and QPSK1 / 4 (the type of MCS may be applied separately to these A-MAP IEs) If possible modulation / demodulation coding is performed, the size of the A-MAP IE allocation unit actually allocated to the A-MAP channel is 1MLRU, 2MLRU, and 4MLRU. MLRU is a size unit of A-MAP IE. Here, the 1-MLRU A-MAP IE allocation unit is obtained by modulating and demodulating the 1-MLRU A-MAP IE with QPSK1 / 2, and the 2-MLRU A-MAP IE allocation unit is the 2MLRU A-MAP IE allocation unit. IE is modulated / demodulated with QPSK1 / 2 or 1MLRU A-MAP IE is modulated / demodulated with QPSK1 / 4, and 4MLRU size A-MAP IE allocation unit is 2MLRU A-MAP IE is QPSK1 / 4 can be obtained by modulation / demodulation coding. Therefore, there are a total of four groups, and in order to simplify blind detection, the size of each group (or the number of A-MAP IE allocation units) or index information defined as a specific pattern is transmitted. Can. These pieces of information can be transmitted through a non-user specific A-MAP A-MAP.

  On the other hand, when the A-MAP IE allocation units are grouped according to the MCS level, the size of each A-MAP IE allocation unit existing in the group may be different, but the A-MAP IE allocation existing in the group may be different. The unit's MCS level can be set the same. FIG. 7 is a diagram illustrating a control message rearrangement pattern according to an embodiment of the present invention. In FIG. 7, A-MAP IE allocation units after modulation / demodulation coding is applied to the A-MAP IE are grouped by MCS level.

  In addition, after the modulation / demodulation coding is applied to the A-MAP IE, the A-MAP IE allocation units that are actually allocated to the A-MAP channel are rearranged according to the MCS level, and the A-MAP IE allocation unit having the same MCS level. Can be re-sorted by size. FIG. 8 is a diagram illustrating a control message rearrangement pattern according to an embodiment of the present invention. As shown in FIG. 8, A-MAP IE allocation units having the same MCS level and the same size can be grouped. A-MAP IEs exist in the sizes of 1MLRU and 2MLRU, and modulation / demodulation coding is performed on these A-MAP IEs by QPSK1 / 2 and QPSK1 / 4 (MCS types can be applied separately). Then, the size of the A-MAP IE allocation unit that is actually allocated to the A-MAP channel is 1MLRU, 2MLRU, and 4MLRU. At this time, the 1-MLRU A-MAP IE allocation unit is obtained by modulating / demodulating the 1-MLRU A-MAP IE with QPSK1 / 2, and the 2-MLRU A-MAP IE allocation unit is the 2MLRU A-MAP IE allocation unit. IE is modulated / demodulated with QPSK1 / 2 or 1MLRU A-MAP IE is modulated / demodulated with QPSK1 / 4, and 4MLRU size A-MAP IE allocation unit is 2MLRU A-MAP IE is QPSK1 / 4 is obtained by modulation / demodulation coding. Therefore, there are a total of four groups, and in order to simplify blind detection, the size of each group (or the number of A-MAP IE allocation units) or index information defined as a specific pattern is transmitted. The Such information can be transmitted through a non-user specific A-MAP A-MAP.

  In addition, as a method for notifying the terminal of such information, a method of broadcasting to all terminals in a cell can be considered.

  When an IEEE 802.16m system is assumed, the information can be transmitted using a user-unspecified A-MAP (Non-user specific A-MAP) or SFH (Super frame Header).

  At this time, when a multiple frequency partition such as fractional frequency reuse (FFR) is applied and a user unspecified A-MAP exists for each partition, an A-MAP in an arbitrary partition is used. A case where the configuration information is indicated by a user unspecified A-MAP assigned to another partition, a case where one user unspecified A-MAP exists for each reuse area, and the like can be considered. When a user-unspecified A-MAP exists for each partition, the A-MAP configuration information of the corresponding partition proposed in the present invention is transmitted in the corresponding partition.

  If the user unspecified A-MAP does not exist in any partition, the A-MAP configuration information in any partition may be indicated by the user unspecified A-MAP assigned to another partition. For example, when a reuse 1 partition and a reuse 3 partition are applied at the same time, a specific reuse-N (reuse-N) partition or reuse 1 that is power boosted. It can be considered that the user unspecified A-MAP is transmitted only in the partition. At this time, a method for transmitting A-MAP configuration information for each partition (size for each group, number of A-MAP IE allocation units, or index information using the above-described index generation method) by a user-unspecified A-MAP. Can be applied. In addition, when both the specific reuse-N partition and the reuse one partition that are power-boosted transmit user-unspecified A-MAP, the A-MAP information corresponding to the relevant partition indicates that the user of the relevant partition is not authorized. It can be indicated with a specific A-MAP.

  A group can be defined by the total size of the A-MAP IE allocation unit for each partition. That is, if multiple partitions are applied and a total of four partitions are configured, there are four groups, and the terminal determines the size of each group by partition (or the number of A-MAP IE allocation units). ) Or index information using the above-described index generation method can be notified through user-unspecified A-MAP or SFH.

  When a user-unspecified A-MAP exists for each partition, the A-MAP configuration information of the corresponding partition proposed in the present invention is transmitted in the corresponding partition.

  Hereinafter, when a multi-frequency partition (FP) such as partial frequency reuse (FFR) is applied in the system, a configuration of a user unspecified A-MAP and a transmission method of the configuration information will be described.

  The number of FPs that can be taken into account by FFR can be determined according to the operating method. For example, when the FFR scheme is FFR 1/3 (that is, the frequency reuse rate associated with FFR is 1/3), the number of FPs is 3, and FFR 1/3 and FFR 1 are When applied, there will be 4 FPs.

  In addition, a specific MCS level can be limited and used for each FP in consideration of FP characteristics (for example, power boosting). For example, QPSK1 / 2 is applied to power boosted FP, QPSK1 / 2 and / or QPSK1 / 8 is applied to FFR 1 partition, and QPSK1 / is applied to powered down FP. 8 can be applied.

  On the other hand, the control message can exist in all the FPs, or can exist only in a predetermined specific FP. If the control message exists only in a predetermined specific FP, for example, the control message FFR1 / 3 can exist only in the power boosted FP, and in the case of FFR1 / 3 and FFR1, the power booth can exist. Can be present only in the FP and / or FFR 1 FP.

  When the control messages are transmitted in groups, the grouping method proposed in the present invention can be applied to the FP in which the control messages exist.

  Hereinafter, an example in which control messages are grouped and transmitted in a system to which FFR is applied will be described.

  In the first example, there are two types of A (Assignment) -A-MAP IE, A type and B type, and the number of FP is 1 (FFR 1 is applied) and applicable. Suppose that the MCSs are QPSK1 / 2 and QPSK1 / 8. QPSK1 / 2 and QPSK1 / 8 are respectively applied to the A type to generate 1MLRU allocation unit and 4MLRU allocation unit, respectively, and QPSK1 / 2 and QPSK1 / 8 are respectively applied to the B type to be 2MLRU allocation unit and 8MLRU respectively. An allocation unit is generated. Therefore, when MCS is applied, there are 1MLRU, 2MLRU, 4MLRU, and 8MLRU A-MAP IE allocation units. The generated 1MLRU can be set to group 1, 2MLRU can be set to group 2, 4MLRU can be set to group 3, and 8MLRU can be set to group 4. At this time, the maximum number of AA-MAP IEs that can be transmitted may be determined according to the size of the resource area allocated for AA-MAP. FIG. 9 is a diagram illustrating a control message reordering pattern when FFR is applied according to an embodiment of the present invention. As shown in FIG. 9, the generated MLRU can map resources having the same MCS level and the same IE size into a group of logically consecutive MLRUs.

  In the second example, it is assumed that there are two types of A-A-MAP (Assignment) IE, A type and B type, and the number of FPs is 3 (FFR 1/3 is applied). To do. AA-MAP exists only in the power boosted partition, and the MCS used is limited to QPSK1 / 2. Since 1MLRU allocation unit and 2MLRU allocation unit are generated by applying QPSK1 / 2 to A type and B type, respectively, when MCS is applied, there are AML-AMAP mapping units of 1MLRU and 2MLRU. The generated 1MLRU allocation unit can be set to group 1 and the 2MLRU allocation unit can be set to group 2. FIG. 10 is a diagram illustrating a control message reordering pattern when FFR is applied according to an embodiment of the present invention. As shown in FIG. 10, resources having the same MCS level and the same IE size can be mapped to a group of logically consecutive MLRUs.

  In the third example, there are two types of A (Assignment) -A-MAP IE, A type and B type, and the number of FPs is 4 (FFR 1/3 and FFR 1 are applied). Suppose that Further, the specific MCS level is limited for each FP in consideration of the characteristics of the corresponding FP (for example, power boosting). For example, as available MCS, QPSK 1/2 is applied to the FFR 1/3 power boosting partition, and QPSK 1/8 is applied to the FFR 1 partition. QPSK 1/2 is applied to the A type and B type in the FFR 1/3 power boosting partition to generate 1 MLRU allocation unit and 2 MLRU allocation unit, respectively. In the FFR 1 region, QPSK1 / 8 is applied to generate a 4MLRU allocation unit and an 8MLRU allocation unit, respectively. Therefore, in this case, when MCS is applied, there are 1 MLRU, 2 MLRU, 4 MLRU, and 8 MLRU (Minimum A-MAP Logical Resource Unit) A-MAP IEs. The generated 1MLRU can be set to group 1, 2MLRU to group 2, 4MLRU to group 3, and 8MLRU to group 4. FIG. 11 is a diagram illustrating a control message rearrangement pattern when FFR is applied according to an embodiment of the present invention. As shown in FIG. 11, the generated MLRU can map resources having the same MCS level and the same IE size to a group of logically continuous MLRUs.

  In the fourth example, there are two types of A (Assignment) -A-MAP IE, A type and B type, and the number of FPs is 4 (FFR 1/3 and FFR 1 are applied). Suppose that Further, in consideration of the characteristics of the corresponding FP (for example, power boosting), each FP is limited to a specific MCS level. For example, as available MCS, QPSK 1/2 is applied to the FFR 1/3 power boosting partition and QPSK 1/2 and QPSK 1/8 are applied to the FFR 1 partition. In the FFR 1/3 power boosting partition, 1 MLRU allocation unit and 2 MLRU allocation unit are generated by applying QPSK 1/2 to A type and B type, respectively. In FFR 1 partition, QPSK1 / 2 is applied to A type and B type to generate 1MLRU allocation unit and 2MLRU allocation unit respectively, and QPSK1 / 8 is applied to A type and B type to respectively allocate 4MLRU allocation unit and 8MLRU allocation. A unit is generated.

  In this case, when MCS is applied, there are 1 MLRU, 2 MLRU, 4 MLRU, and 8 MLRU A-MAP IE allocation units. 1MLRU allocation unit of FFR 1/3 power boosting partition is set to group 1, 2MLRU is set to group 2, 1MLRU allocation unit of FFR 1 partition is set to group 3, 2MLRU is set to group 4, 4MLRU is set to group 5, 8MLRU Can be set to group 6. FIG. 12 is a diagram illustrating a control message reordering pattern when FFR is applied according to an embodiment of the present invention. As shown in FIG. 12, the generated MLRU can map resources having the same MCS level and the same IE size to a group of logically consecutive MLRUs. At this time, resources having the same MCS level and the same IE size can be mapped to different groups if they exist in different FPs.

  In the fifth example, there are two types of A (Assignment) -A-MAP IE, A type and B type, and the number of FP is 4 (FFR 1/3 and FFR 1 are applied). Suppose that The same MCS level is limited and used for all FPs, and the power level can be adjusted as necessary to maintain link performance. For example, QPSK1 / 2 can be used as an available MCS. In the FFR 1/3 power boosting partition, QPSK 1/2 is applied to the A type and the B type, respectively, to generate 1 MLRU allocation unit and 2 MLRU allocation unit, respectively. In the FFR 1 partition, QPSK 1/2 is applied to the A type and the B type. Are applied to generate a 1MLRU allocation unit and a 2MLRU allocation unit, respectively.

  At this time, even if the AA-MAP has the same MCS level and the same IE size, they can be grouped into different groups if they exist in different FPs. Therefore, the 1MLRU allocation unit of the FFR 1/3 power boosting partition can be set to group 1, the 2MLRU can be set to group 2, the 1MLRU allocation unit of the FFR 1 partition can be set to group 3, and the 2MLRU can be set to group 4. . FIG. 13 is a diagram illustrating a control message rearrangement pattern when FFR is applied according to an embodiment of the present invention. As shown in FIG. 13, the generated MLRU can map resources having the same MCS level and the same IE size to a group of logically continuous MLRUs. At this time, resources having the same MCS level and the same IE size can be mapped to different groups if they exist in different FPs.

  That is, as described above, when a large number of FPs exist by FFR, one of the above grouping methods can be applied in the FP in which the control message exists. A combination of the above grouping methods can also be used.

  Hereinafter, a method of transmitting the AA-MAP IE through a control channel that is broadcast to a large number of terminals will be described. When various FPs are allowed in the system, a method for efficiently signaling these FPs is necessary. For example, the number of AA-MAP IE allocation units for each group or the size of each group can be signaled. Alternatively, the number of all possible AA-MAP IE allocation units for each group may be generated as a table, and an index suitable for the corresponding transmission method may be signaled. At this time, the maximum number of MLRUs (for example, the maximum MLRU number is 16, 17, 18, 19, 20, 21, 23, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42). Each table is generated, and an index can be selected from the table suitable for the transmission method and transmitted.

  Hereinafter, a method for generating a table and signaling an index will be described.

  In the first case, a common superset table not related to the FP configuration can be generated and the index of the table can be used. For example, a table applicable to all of one, three, or four FPs can be generated. For this reason, when the number of FPs is 1, 3, or 4, it is possible to generate a superset table that includes all groups that can be generated. In this case, the superset is determined by the transmission method. For example, to make it possible to include all of the first example, the second example, and the third example described above, a superset table applicable to a total of four groups is generated. Also, in order to be able to include all of the first example, the second example, and the fifth example, a superset table applicable to a total of four groups is generated. In order to be able to include all of the first example, the second example, and the fourth example, a superset table applicable to a total of six groups is generated.

  In the second case, a superset table can be generated and an index associated with a specific FP can be signaled as a subset of the superset table. For example, when there are superset tables applicable to a total of four groups in order to make it possible to include all of the first example, the second example, and the third example, the superset table Used for the first example and the third example, in the second example, an index can be extracted from the superset table and signaled.

  In the third case, the table can be generated and used individually according to the FP configuration. That is, different tables can be applied depending on the FP. For example, in the case of a system that supports one, three, or four FPs, an optimal table suitable for each number of FPs is generated, and an index of the corresponding table is signaled. At this time, the generation principle of the table is the same as the method described above. In the case of the first example, the index of the table generated using the number of units or the group size of each of the four groups can be signaled. In the case of the second example, it is possible to signal an index of a table generated using the number of units or group size of each of two groups. In the case of the third to fifth examples, the index of the table generated using the number of groups or the size of the group can be signaled.

  The number of FPs or the type of table to be used can be broadcast to each terminal through a broadcast channel (BCH), and a user unspecified control message in the A-MAP is used before using the index. Signaling is also possible.

  In the fourth case, among the groups existing in the FP, groups having the same characteristics (for example, the same MCS and / or IE size) can be integrated to generate a table. For example, in the fourth example or the fifth example, the characteristics of group 3 are the same as group 1 and group 4 is the same as group 2. In this case, the table can be generated by integrating group 1 and group 3 as group A and integrating group 2 and group 4 as group B. In this case, the complexity of blind detection for decoding the control message may increase. On the other hand, in addition to the criteria for grouping control messages as described above, the control messages can be grouped according to the use of the control message, for example, uplink assignment, downlink assignment or downlink persistent assignment. .

  In the above description, the grouping criteria mainly dealt with the size of the control message or the MCS level, but the criteria constituting the group are not limited to the above example. They can be grouped according to various criteria, and the contents described above can be applied to these various criteria. The table generation method and signaling method supporting various FPs can be used in combination with the table generation method supporting various bands and control signaling periods. In addition to the method of generating all possible combinations for each group, a method for reducing signaling overhead can be applied as the table generating method.

  Using the method described above, the terminal can receive the control message after receiving information related to the rearrangement pattern of the control message in advance before receiving the control message. The terminal can detect its own message from the received control messages using the control message rearrangement pattern included in the information.

  Therefore, it is possible to simplify the blind detection while minimizing the overhead by notifying the terminal of information on the control message rearrangement pattern before transmitting the control message. As a result, the complexity and time for confirming the control message can be reduced.

  FIG. 14 is a block diagram illustrating a configuration of an apparatus that can be applied to a base station and a terminal and can execute the method described above. As shown in FIG. 14, the apparatus 60 includes a processing unit 61, a memory unit 62, an RF (Radio Frequency) unit 63, a display unit 64, and a user interface unit 65. The physical interface protocol layer is performed by the processing unit 61. The processing unit 61 provides a control plane (plane) and a user plane (plane). The function of each layer can be performed by the processing unit 61. The memory unit 62 is electrically connected to the processing unit 61 and stores an operating system, an application program, and a general file. If the device 60 is a terminal, the display unit 64 can display various information and can be implemented using a known LCD (Liquid Crystal Display), OLED (Organic Light Emitting Diode), or the like. The user interface unit 65 can be configured in combination with a known user interface such as a keypad or a touch screen. The RF unit 63 is electrically connected to the processing unit 61, and transmits and receives radio signals.

  In the present specification, the embodiments of the present invention have been described mainly on the data transmission / reception relationship between the base station and the terminal. Here, the base station has the meaning of a terminal node (terminal node) of the network that directly communicates with the terminal. The specific operations described in this document as being performed by a base station may be performed by an upper node of the base station in some cases.

  That is, various operations performed for communication with a terminal in a network including a large number of network nodes including a base station can be performed by the base station or another network node other than the base station. Here, 'base station' can be replaced with terms such as a fixed station, Node B, eNode B (eNB), and access point. In the present invention, the terminal corresponds to a mobile terminal (MS), and the mobile terminal is a user equipment (UE), a subscriber station (SS), a mobile subscriber station (MSS), or a mobile terminal (Mobile Terminal). ) And other terms.

  The transmitting end means a node that transmits data or voice service, and the receiving end means a node that receives data or voice service. Therefore, in the uplink, a terminal can be a transmitting end and a base station can be a receiving end. Similarly, in the downlink, a terminal can be a receiving end and a base station can be a transmitting end.

  On the other hand, the mobile station of the present invention includes a PDA (Personal Digital Assistant), a cellular phone, a PCS (Personal Communication Service) phone, a GSM (Global System for Mobile mobile phone), a WCDMA (Wideband CDMA Mobile phone, MBS). A phone or the like can be used.

  Embodiments of the present invention can be implemented through various means. For example, the embodiments of the present invention can be implemented by hardware, firmware, software, or a combination thereof.

  In the case of implementation by hardware, the method according to an embodiment of the present invention may include one or more ASICs (application specific integrated circuits), DSPs (digital signal processor), DSPS (digital signal processing), DSPDs (digital signal processing). devices), FPGAs (field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.

  In the case of implementation by firmware or software, the method according to the embodiment of the present invention may be implemented in the form of a module, procedure, function, or the like that performs the function or operation described above. The software code can be stored in a memory unit and driven by a processor. The memory unit is provided inside or outside the processor, and can exchange data with the processor by various known means.

  Various embodiments have been described as the best mode for carrying out the invention.

  The present invention can be applied to a terminal or network device used in a wireless connection system.

  The present invention may be embodied in other specific forms without departing from the spirit and essential characteristics of the invention. Accordingly, the above detailed description should not be construed as limiting in any respect and should be considered as exemplary. The scope of the invention should be determined by reasonable analysis of the appended claims, and thus all modifications within the equivalent scope of the invention are included in the scope of the invention. In addition, claims which do not have an explicit citation relationship in the claims can be combined to constitute an embodiment, or can be included as a new claim by amendment after application.

Claims (18)

A method for transmitting a control message at a base station in a wireless communication system, comprising:
The method
Generating X control message groups by grouping the plurality of control messages based on a MCS (Modulation and Coding Scheme) level applied to a plurality of control messages for at least one user equipment ; X is a positive integer, and
Of the plurality of indexes, transmitting an index corresponding to a combination of the number of control messages included in each of the X control message groups, wherein each of the plurality of indexes includes G _x (x = 1, Corresponding to one of a plurality of possible combinations of X), and G _x is the number of control messages included in the control message group x (x = 1,... X), ,
Based on the index, and a transmitting of the X number of the control message group,
The modulation method of the MCS level applied to the plurality of control messages is QPSK (Quadrature Phase Shift Keying),
Wherein X number of control the same control control message message Ru included in the group of the message group uses the same MCS level, method. The method of claim 1, wherein the plurality of control messages are located in at least one of a power boosted reuse-3 frequency domain and a reuse-1 frequency domain. The index corresponding to the combination of the number of control messages included in each of the X control message groups is located only in the power boosted reuse-3 frequency domain or the reuse-1 frequency domain. Item 3. The method according to Item 2. Wherein X number of control message group is transmitted in a state of being aligned based on the MCS levels applied to the plurality of control messages, method who claim 2. Each of said X number of control message group occupies logically contiguous or physically contiguous resource units, the method according to claim 2. 6. The X control message groups are generated such that control messages located in different frequency domains are included in different control message groups to which the same MCS level is applied. The method according to one item. The total number of the plurality of indexes is the G _x So that at least one of the plurality of indexes is less than the total number of possible combinations of _x The method according to any one of claims 1 to 5, corresponding to a combination representing two or more of the possible combinations. The method according to claim 7, wherein the X control message groups are generated such that control messages located in different frequency regions are included in different control message groups to which the same MCS level is applied. A method for receiving a control message from a base station at a user equipment in a wireless communication system, comprising:
The method
An index corresponding to a combination of the number of control messages included in each of the X control message groups among the plurality of indexes is received from the base station, and each of the plurality of indexes is represented by G _x (x = 1,... X) corresponding to one of a plurality of possible combinations, G _x is the number of control messages included in the control message group x (x = 1,... X) , That,
At least one of the MCS to be applied to a plurality of control messages to user equipment (Modulation and Coding Scheme) said base station said X number of control message group generated by grouping a plurality of control messages based on the level and it is received from,
And a to decode the control message is included in at least one control message group of said X number of control message group based on the index,
The modulation method of the MCS level applied to the plurality of control messages is QPSK (Quadrature Phase Shift Keying),
Wherein X number of control the same control control message message Ru included in the group of the message group uses the same MCS level, method. The method of claim 9, wherein the plurality of control messages are located in at least one of a power boosted reuse-3 frequency domain and a reuse-1 frequency domain. The index corresponding to the combination of the number of control messages included in each of the X control message groups is located only in the power boosted reuse-3 frequency domain or the reuse-1 frequency domain. Item 11. The method according to Item 10. The method of claim 10 , wherein one or more control messages are received in an aligned state based on an MCS level applied to the plurality of control messages . Each of said X number of control message group occupies logically contiguous or physically contiguous resource unit, The method of claim 10. 14. The X control message groups are generated such that control messages located in different frequency regions that are applied to the same MCS level are included in different control message groups. The method according to one item. The total number of the plurality of indexes is the G _x So that at least one of the plurality of indexes is less than the total number of possible combinations of _x 14. A method according to any one of claims 9 to 13 corresponding to a combination representing two or more of the possible combinations. 16. The method of claim 15, wherein the X control message groups are generated such that control messages located in different frequency regions are included in different control message groups to which the same MCS level is applied. A device configured to perform any one of claims 1-16. A program programmed to execute a computer of the device to cause the device to execute any one of claims 1-16.

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