KR101276854B1 - Method for indicating downlink control message construction information - Google Patents

Abstract

In a cellular system, a method for informing a user equipment of control message configuration information at a base station is provided. The method may further include: generating, by the base station, control message configuration information indicating a configuration method of a plurality of control messages for at least one user equipment; And transmitting the generated control message configuration information to the at least one user device, wherein the plurality of control messages for the at least one user device include an uplink Acknowledgment / Negative Acknowledgment (ACK / NACK) channel index. Whether it can be used implicitly, whether the user equipment corresponding to the control message can use the uplink ACK / NACK channel index implicitly, the size of the information element (IE) of the control message, the control message Is divided into a predetermined number of sub blocks, the modulation and coding scheme (MCS) level applied to the control message, the size of the information element (allocated IE) of the control message after the MCS level is applied, and the information element of the control message. Is grouped based on at least one of the frequency partitions in which When the groups generated by the grouping are transmitted in a sorted manner, the sorting information of the control message includes information about the number or size of the group of the control messages included in each group generated by the grouping.

Control message, blind detection, grouping

Description

In the cellular system, a method for notifying downlink control message configuration information is provided.

The present invention relates to a method of reducing complexity in detecting a control message received by a user device when transmitting a control message to a user device or a group of user devices in a cellular system.

In a cellular system, in order for a terminal to receive data from a base station, each terminal must first transmit various information messages (hereinafter, referred to as control messages) such as resource location, modulation and coding method, and MIMO method in which its own data exists. . Such a control message should exist for each terminal to receive data from the base station. Similarly, a method of transmitting a control message for each group by forming several terminals in a group may also be considered. In this case, the size of each control message may vary depending on the content of the information and the modulation and coding method.

On the other hand, when the base station transmits control messages of different sizes to the terminals, it is possible to consider a method of notifying the configuration information and the modulation and coding information in a frame of the control messages in advance and the method of not providing the information.

In the former case, each terminal can easily detect the corresponding control message because the terminal knows the position in the frame of the corresponding control message and the modulation and coding information, but there is a disadvantage in that additional information needs to be sent.

On the other hand, in the latter case, no overhead occurs because no additional information is transmitted, but each terminal must perform blind detection in order to check its control message. This means that all terminals should perform blind detection in all sections within a frame in which a control message exists. On the other hand, when the number of cases to be considered when blind detection increases, the complexity and time for confirming the control message increases, resulting in power loss of the terminal. Therefore, consider ways to make blind detection easier while minimizing overhead.

The complexity of blind detection depends on the size of the control message and how many control messages should be considered. If all control messages have different lengths, this will be more complicated. Therefore, in general, the length of the control message is generally limited to a few. For example, allowing only three sizes of 30 bits, 60 bits, and 90 bits as the size of the control message will greatly reduce the complexity. If the basic unit of this size is defined as a control block (CB) for convenience, the above example can be said that a control message having three sizes of 1, 2, and 3CB exists (assuming 1CB = 30bit).

However, even if the size of the control message is in CB, the blind detection complexity is very large. For example, there are three types of CBs, and up to four control messages must be taken into consideration. When considering blind detection, there are three types of control messages (1 CB or 2 CBs or 3 CBs). If there are two control messages, 3 ² exists. If there are 3 control messages, 3 ³ exists, and if there are 4 control messages, 3 ⁴ exist.

Since there are 120 cases in total and the terminal does not have any information on this, each terminal should perform detection of up to 120 times, but it is possible to know whether the control message of the corresponding terminal exists and what information is included. do. In general, if the number of types of CB is N and the maximum number of control messages is M, the maximum number of attempts to perform detection will be sum (N ^m ). Since the number of times of detection results in deterioration of the performance of the system, a method of reducing the number of times of detection should be considered.

Frequency reuse is one of the ways to increase the number of channels per unit area in a cellular system. The intensity of the radio wave becomes weaker as the distance increases, and thus the same frequency channel can be used because there is less interference between radio waves at a certain distance or more. Using this principle, the same frequency can be used in multiple regions at the same time, greatly increasing subscriber capacity. This efficient use of frequency is called frequency reuse. The unit for distinguishing regions is called a cell (mobile communication cell), and the switching of frequency channels between cells for maintaining a call is called handoff. Frequency reuse technology is essential in analog cellular mobile communication. Frequency reuse is one of the parameters indicative of frequency efficiency in cellular systems. The frequency reuse rate is a value obtained by dividing the total number of cells (sectors) using the same frequency at the same time in the multi-cell structure by the total number of cells (sectors) in the entire multi-cell structure.

Frequency reuse of 1G systems (eg AMPS) is less than one. For example, for 7-cell frequency reuse, the frequency reuse rate is 1/7. The frequency reuse rate of 2G systems (eg CDMA and TDMA) is improved over 1G. For example, in GSM combined with FDMA and TDMA, the frequency reuse rate can reach 1/4 to 1/3. For 2G CDMA systems and 3G WCDMA systems, the frequency reuse rate can reach 1, increasing the efficiency of the spectrum and reducing network deployment costs.

A frequency reuse rate of 1 can be obtained when all sectors within a cell and all cells within a network use the same frequency. However, obtaining a frequency reuse rate of 1 in a cellular network implies that users at the cell's boundary reduce signal reception performance by interference from adjacent cells.

In OFDMA, signals are transmitted on subchannels because channels are divided into subchannel units, and all channels are not used as in 3G (CDMA2000 or WCDMA). Using this feature, the throughput of users at the center of the cell and users at cell boundaries (cell edges) can be improved simultaneously. In particular, the central region of the cell is close to the base station and therefore safe from co-channel interference from adjacent cells. Therefore, internal users in the center of the cell can use all available subchannels. However, users at cell boundaries may only use some of all available subchannels. At cell boundaries adjacent to each other, each cell is assigned a frequency to use a different subchannel. This method is called fractional frequency reuse (FFR).

When the FFR is applied to the cellular system, when the number of cases considered when performing the blind detection described above increases, the complexity and time for confirming the control message are increased, resulting in power loss of the terminal. Therefore, consider ways to make blind detection easier while minimizing overhead.

An object of the present invention is to provide a method for facilitating blind detection of a control message received from a base station by a user equipment while minimizing overhead.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

In a cellular system according to an aspect of the present invention for solving the above problems, a method for notifying control device configuration information from a base station to a user device includes a method in which the base station informs a configuration method of a plurality of control messages for at least one user device; Generating control message configuration information; And transmitting the generated control message configuration information to the at least one user device, wherein the plurality of control messages for the at least one user device include an uplink Acknowledgment / Negative Acknowledgment (ACK / NACK) channel index. Whether it can be used implicitly, whether the user equipment corresponding to the control message can use the uplink ACK / NACK channel index implicitly, the size of the information element (IE) of the control message, the control message Is divided into a predetermined number of sub blocks, the modulation and coding scheme (MCS) level applied to the control message, the size of the information element (allocated IE) of the control message after the MCS level is applied, and the information element of the control message. Are grouped based on at least one of the frequency partitions Alignment information of the control message in the case where the groups are aligned transmission generated by the group group includes information about the number of groups or the size of the control messages included in each group generated by the grouping.

The information about the number of control messages included in each group may be index information selected from a predetermined table.

Each group may include a logically contiguous resource unit or a physically contiguous resource unit.

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

Each group may determine whether a control message included in each group implicitly uses an uplink ACK / NACK (Acknowledgment / Negative Acknowledgment) channel index, and a user equipment corresponding to the control message may use an uplink ACK / NACK channel. Whether the index can be used implicitly, the size of the information element (IE) of the control message, whether the control message has been divided into a predetermined number of subblocks, and the modulation and MCS applied to the control message. The information may be aligned and transmitted based on at least one of the coding scheme level, the size of the information element (allocated IE) of the control message after the MCS level is applied, and the frequency partition in which the information element of the control message exists.

According to the present invention, it is possible to facilitate the blind detection of the control message while minimizing the overhead by informing the user in advance of the information on the alignment pattern of the control message before the control message is arranged and transmitted according to a predetermined rule and transmitting the control message. Do. Therefore, the complexity and time for acknowledging the control message can be reduced.

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

In the description of the drawings, procedures or steps which may obscure the gist of the present invention are not described, and procedures or steps that can be understood by those skilled in the art are not described.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention, and are not intended to limit the scope of the invention.

The entire band used by the base station is divided into a predetermined number of subbands. The entire band may be pre-divided by the base station when FFR (Fractional Frequency Reuse) is used, or may be divided for convenience of transmission of a control message. Therefore, the number of subbands generated by dividing the entire bands may be variously present in one or more, and the size of each subband may be set identically or differently. If a resource region is allocated for the terminal to receive data in the divided subbands, the control message of the corresponding terminal is present in the subband.

The complexity of blind detection depends on the size of the control message and how many control messages should be considered. If all control messages have different lengths, this will be more complicated. Therefore, in general, the length of the control message is generally limited to a few. For example, allowing only three sizes of 30 bits, 60 bits, and 90 bits as the size of the control message will greatly reduce the complexity. If the basic unit of this size is defined as a control block (CB) for convenience, for example, assuming that 1CB corresponds to 30 bits, the above example assumes that a control message having three sizes of 1, 2, and 3CB exists. Can be.

On the other hand, after collecting the control messages allocated to the resource region, the base station may arrange the size of these control messages in descending order and transmit them sequentially. For example, if four control messages are 2CB, 1CB, 3CB, and 3CB, respectively, they are arranged in order of 3CB, 3CB, 2CB, and 1CB.

1 is a block diagram of a transmission resource for transmitting a control message. As shown in FIG. 1, for convenience, the size of CB is assumed to be composed of integer multiples (eg, 1CB, 2CB, 3CB, etc.), and the size of the largest CB is N. In addition, it is assumed that resources of a total M CB size can be allocated for control message transmission in the divided region.

Therefore, when all messages have a size of 1 CB, up to M control messages can be sent in the above-described divided region. Various combinations exist when control messages of 1 to N CB sizes are combined and transmitted in an area where resources of M CB size are allocated for transmission of control messages. However, when the transmission is arranged in descending order at the base station, The number is limited and the pattern is also limited.

Consider the case where the size of the largest control message in the divided region is 1 CB to N CB, respectively. If the size of the largest control message is n (1≤n≤N) CB, then there will be 1 to n CB size control messages, which will all be arranged in descending order. In the present invention, when the information on the pattern in which the control message is arranged is called control message configuration information, the base station transmits configuration information on the control message in advance before the control message is transmitted.

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

In this case, it is assumed that control message information exists in all divided regions of the M CB size to form control message configuration information. That is, if the total size of control messages is smaller than M CB, it is assumed that there are 1 CB of control messages in the remaining part. 2 illustrates an example of generating control message configuration information. For example, if M = 12, n = 3 and there is one control message of 3CB and 2CB size, the configuration information generation example thereof is as shown in FIG.

Table 1 shows a combination of CB sizes forming control message configuration information when the size of the largest control message is n.

Control message combination when the largest control message is n CB (n) (n, 1)
(n, 2), (n, 2,1) (n, 3), (n, 3,1), (n, 3,2), (n, 3,2,1) (n, 4), (n, 4,1), (n, 4,2), (n, 4,2,1), (n, 4,3), (n, 4,3,1), (n, 4,3,2), (n, 4,3,2,1)                                      ... (n, n-1), (n, n-1, 1), ... (n, n-1, n-2,… 1)

The number of types of configuration information matching the combination disclosed in Table 1 may vary depending on the M value. 3 shows an example of a pattern of configuration information of a control message according to the present invention. For convenience, assuming that M = 12, n = 3, a combination of (3, 2, 1) (which indicates control message configuration information consisting of control messages of 1 CB, 2 CB, and 3 CB sizes) is illustrated in FIG. There is a pattern as shown.

Although the configuration information listed in FIG. 3 is all formed by the combination of (3, 2, 1), how many CBs are present is determined according to M value. For convenience of explanation, in the above combination, the CB having the next largest CB next to the smallest CB is defined as the secondary sub CB, and the CB having the next largest CB after the secondary sub CB It will be defined as CB, and if there is a larger CB than the next lower CB, it will be defined according to the above rule.

For example, considering the combination [3, 2, 1, 1, 1, 1, 1, 1, 1], each number represents the size of the CB, the smallest CB is 1 CB, and the next lower CB is 1 CB. The next largest 2CB, the next lowest CB is the second largest 3CB.

The method of generating configuration information generated from the same CB combination is to set the remaining CBs to one each except the smallest CB, fill the smallest CB with the remaining area (for example, [3, 2 , 1, 1, 1, 1, 1, 1, 1]), and increase the number of subordinate CBs (for example, the number of 2CBs) (for example, [3, 2, 2, 1, 1, 1, 1, 1], [3, 2, 2, 2, 1, 1, 1], [3, 2, 2, 1]).

This process is gradually repeated after incrementally increasing the number of next CBs (for example, the number of 3CBs) one by one.

That is, two sub-CBs (for example, 3 CBs) exist and become [3, 3, 2, 1, 1, 1, 1], and the number of lower sub-CBs (2CBs) gradually increases to [3, 3, 2, 2, 1, 1], and then there are three sizes (3CB) of the next lower order CB, resulting in [3, 3, 3, 2, 1]. In this process, certain CB combinations may not appear depending on the M value.

If M is 16, CB combination (3) cannot occur. If there are five 3CBs, the other one must be filled with 1CB, so the CB combination (3) is included in the (3,1) combination, so if the size of the largest control message listed above is n The combination of CB sizes forming the information may be partially excluded depending on the M value.

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

If the five control messages are composed of 3CB, 1CB, 2CB, 1CB, and 3CB, respectively, the descending order for them is [3, 3, 2, 1, 1], and the base station controls in this order. Sort and send the message. In this case, if the [3, 3, 2, 1, 1, 1, 1] pattern information of the above example is informed, the terminal sequentially decodes the control message in units of 3CB, 3CB, 2CB, 1CB, 1CB, 1CB, 1CB ( By decoding, it is checked whether a control message exists. Since each terminal knows how to transmit the control message from the base station, the complexity of the size of the control message is eliminated in decoding. In addition, since the probability of generating a large control message due to the modulation and coding scheme is high, the complexity may be reduced if the point is used during demodulation and decoding.

Example  One

Assuming that a total of 16CBs are allocated for control messages in a subband generated by dividing the entire bands, and control messages are allowed up to a size of 1CB to 3CB, configuration information consists of 30 types as shown in Table 2 below. It is necessary to inform each terminal of index information formed of a total of 5 bits.

index pattern CB combination One [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1] (One) 2 [2,1,1,1,1,1,1,1,1,1,1,1,1,1,1] (2,1) 3 [2,2,1,1,1,1,1,1,1,1,1,1,1,1] (2,1) 4 [2,2,2,1,1,1,1,1,1,1,1,1,1] (2,1) 5 [2,2,2,2,1,1,1,1,1,1,1,1] (2,1) 6 [2,2,2,2,2,1,1,1,1,1,1] (2,1) 7 [2,2,2,2,2,2,1,1,1,1] (2,1) 8 [2,2,2,2,2,2,2,1,1] (2,1) 9 [2,2,2,2,2,2,2,2] (2) 10 [3,1,1,1,1,1,1,1,1,1,1,1,1,1] (3, 1) 11 [3,2,1,1,1,1,1,1,1,1,1,1,1] (3,2,1) 12 [3,2,2,1,1,1,1,1,1,1,1,1] (3,2,1) 13 [3,2,2,2,1,1,1,1,1,1,1] (3,2,1) 14 [3,2,2,2,2,1,1,1,1,1] (3,2,1) 15 [3,2,2,2,2,2,1,1,1] (3,2,1) 16 [3,2,2,2,2,2,2,1] (3,2,1) 17 [3,3,1,1,1,1,1,1,1,1,1,1] (3, 1) 18 [3,3,2,1,1,1,1,1,1,1,1] (3,2,1) 19 [3,3,2,2,1,1,1,1,1,1] (3,2,1) 20 [3,3,2,2,2,1,1,1,1] (3,2,1) 21 [3,3,2,2,2,2,1,1] (3,2,1) 22 [3,3,2,2,2,2,2] (3,2) 23 [3,3,3,1,1,1,1,1,1,1] (3, 1) 24 [3,3,3,2,1,1,1,1,1] (3,2,1) 25 [3,3,3,2,2,1,1,1] (3,2,1) 26 [3,3,3,2,2,2,1] (3,2,1) 27 [3,3,3,3,1,1,1,1] (3, 1) 28 [3,3,3,3,2,1,1] (3,2,1) 29 [3,3,3,3,2,2] (3,2) 30 [3,3,3,3,3,1] (3, 1)

In the system, there is a case where the maximum number of control messages that can be transmitted in one transmission of the control message is limited. To this end, the pattern may be reconfigured by separating only the maximum number from each pattern formed in Table 1, and the same pattern may be removed to reconstruct the configuration information.

For example, in the first embodiment, when the maximum number of control messages is limited to six, the pattern and index may be obtained by reconstructing the result of Table 2 above. Table 3 below shows the control message configuration information by reconfiguring the result of Table 2 when the maximum number of control messages is limited to six. That is, six control messages are selected in order from the left in the pattern of each control message of Table 2 to reconstruct the pattern and give a new index to each reconstructed pattern.

Maximum number of control messages (6) index pattern CB combination Reconstructed Pattern CB combination New index One [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1] (One) [1,1,1,1,1,1] (One) One 2 [2,1,1,1,1,1,1,1,1,1,1,1,1,1,1] (2,1) [2,1,1,1,1,1] (2,1) 2 3 [2,2,1,1,1,1,1,1,1,1,1,1,1,1] (2,1) [2,2,1,1,1,1] (2,1) 3 4 [2,2,2,1,1,1,1,1,1,1,1,1,1] (2,1) [2,2,2,1,1,1] (2,1) 4 5 [2,2,2,2,1,1,1,1,1,1,1,1] (2,1) [2,2,2,2,1,1] (2,1) 5 6 [2,2,2,2,2,1,1,1,1,1,1] (2,1) [2,2,2,2,2,1] (2,1) 6 7 [2,2,2,2,2,2,1,1,1,1] (2,1) [2,2,2,2,2,2] (2) 7 8 [2,2,2,2,2,2,2,1,1] (2,1) [2,2,2,2,2,2] (2) 9 [2,2,2,2,2,2,2,2] (2) [2,2,2,2,2,2] (2) 10 [3,1,1,1,1,1,1,1,1,1,1,1,1,1] (3, 1) [3,1,1,1,1,1] (3, 1) 8 11 [3,2,1,1,1,1,1,1,1,1,1,1,1] (3,2,1) [3,2,1,1,1,1] (3,2,1) 9 12 [3,2,2,1,1,1,1,1,1,1,1,1] (3,2,1) [3,2,2,1,1,1] (3,2,1) 10 13 [3,2,2,2,1,1,1,1,1,1,1] (3,2,1) [3,2,2,2,1,1] (3,2,1) 11 14 [3,2,2,2,2,1,1,1,1,1] (3,2,1) [3,2,2,2,2,1] (3,2,1) 12 15 [3,2,2,2,2,2,1,1,1] (3,2,1) [3,2,2,2,2,2] (3,2) 13 16 [3,2,2,2,2,2,2,1] (3,2,1) [3,2,2,2,2,2] (3,2) 17 [3,3,1,1,1,1,1,1,1,1,1,1] (3, 1) [3,3,1,1,1,1] (3, 1) 14 18 [3,3,2,1,1,1,1,1,1,1,1] (3,2,1) [3,3,2,1,1,1] (3,2,1) 15 19 [3,3,2,2,1,1,1,1,1,1] (3,2,1) [3,3,2,2,1,1] (3,2,1) 16 20 [3,3,2,2,2,1,1,1,1] (3,2,1) [3,3,2,2,2,1] (3,2,1) 17 21 [3,3,2,2,2,2,1,1] (3,2,1) [3,3,2,2,2,2] (3,2) 18 22 [3,3,2,2,2,2,2] (3,2) [3,3,2,2,2,2] (3,2) 23 [3,3,3,1,1,1,1,1,1,1] (3, 1) [3,3,3,1,1,1] (3, 1) 19 24 [3,3,3,2,1,1,1,1,1] (3,2,1) [3,3,3,2,1,1] (3,2,1) 20 25 [3,3,3,2,2,1,1,1] (3,2,1) [3,3,3,2,2,1] (3,2,1) 21 26 [3,3,3,2,2,2,1] (3,2,1) [3,3,3,2,2,2] (3,2) 22 27 [3,3,3,3,1,1,1,1] (3, 1) [3,3,3,3,1,1] (3, 1) 23 28 [3,3,3,3,2,1,1] (3,2,1) [3,3,3,3,2,1] (3,2,1) 24 29 [3,3,3,3,2,2] (3,2) [3,3,3,3,2,2] (3,2) 25 30 [3,3,3,3,3,1] (3, 1) [3,3,3,3,3,1] (3, 1) 26

As shown in Table 3, since the overlapping pattern exists when the maximum number of control messages is limited to six, it is possible to reduce the total number of indexes from 30 indexes to 26 indexes.

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

4 illustrates an example of configuration information of a control message for reducing the number of valid bits for transmission of control message configuration information. As shown in FIG. 4, since b is 1 or 2, the UE has to decode only 2CB and 1CB for this part, but the entire pattern is combined according to this principle. The number of indexes decreases.

It is possible to extend this principle to replace specific parts with 'b' for the whole pattern. For example, the same pattern as above [3, 3, 3, 2, 2, 2, 1] and [3, 3, 3, 2, 2, 1, 1, 1] is [3, 3, 3, 2, b] , 1]. That is, the underlined portions of the patterns [3, 3, 3, 2, 2, 2 , 1] and [3, 3, 3, 2, 2, 1, 1 , 1] are replaced with 'b'. It can be represented by [3, 3, 3, 2, b, 1]. At this time, in order to check the 'b' part, three decoding operations of '2,2', '2,1,1' and '1,1,1,1' should be performed. Thus, the patterns of [3,3,3,2,1,1,1,1,1] are also considered to be the same set. The number indicated by 'b' is predetermined in the system how many CBs to consider, or the base station can inform the terminal of the value can reduce the total number of indexes.

In the use of the configuration information formed on the same principle, a method of informing the number of control messages before transmitting the control message first, and at this time, it is also possible to index according to the configuration information to be reconstructed.

Up to now, a case has been described in which the entire message is divided into subbands and the control message is transmitted to the allocated subband, but the configuration of the control message may be configured without limiting the subbands. That is, even though the actual band is divided into several subbands for the same reason as FFR, the control message can be transmitted irrespective of this. In this case, power boosting may be considered for reliable transmission of the control message. This would be very suitable for applications such as FFR. The construction principle of the configuration information is the same as described above except that the size M value of the subband and the number of control messages are considered as the entire band.

In addition to the control message configuration information, the following additional message may be required.

○ Assuming that the whole band is divided into K subbands, information on the presence or absence of a control message in each partition:

For example, it is possible to send this content in bitmap format. If the entire band is divided into three, a bitmap consisting of three bits can be used, such as {b1, b2, b3}. At this time, each of the bits b1, b2, and b3 represents three subbands in order. For example, each bit of the bitmap may be determined to have a value of '1' if a control message exists in a corresponding subband, and a value of '0' if not present. For example, when the control message exists only in the first subband, {b1, b2, b3} = {1, 0, 0}.

○ Area Information:

Total control messages

Maximum number of control messages allowed in subband (M value)

Maximum Control Message Count

Number of control messages in each subband

The present invention can be applied to the transmission of the unicast service control channel (USCCH) in the IEEE 802.16m standard. USCCH is divided into User-Specific Control Information (USCI) and Non User-Specific Control Information (NUSCI). At this time, when USCI is transmitted, each USCI is separately coded. have. If there is no information in transmitting such USCI, the UE 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 each USCI in descending order by size.

The configuration information formed in the text is described in descending order, but the same can be applied to sorting in ascending order.

Hereinafter, a method of constructing a control message according to the second aspect of the present invention is described.

In the case of the 1 CB to N CB size control messages in the M CB size region, there are a variety of cases, but the number of cases is limited because the base stations are arranged in descending order and the pattern is also limited. Therefore, we suggest creating groups for each size after sorting in descending order. For example, after modulating and / or coding a control message, a size of 1CB is defined as Group 1, and a case of 2CB is defined as Group 2. Therefore, the number of groups generated in this way is formed by the number of kinds of size of the control message. Consider all possible groups, keeping the sum of the sums of the control messages below M.

Example  2

Table 4 below is an example of the formation of configuration information assuming that M of the system is 5 and that the size of the control message is 1, 2, 4CB. In Table 4, Group 1 is a group of control messages of 1CB size, Group 2 is a group of control messages of 2CB size, and Group 3 represents a group of control messages of 4CB size.

index Group 1
(1CB) Group2
(2CB) Group3
(4CB) 0 0 0 0 One One 0 0 2 2 0 0 3 3 0 0 4 4 0 0 5 5 0 0 6 0 One 0 7 One One 0 8 2 One 0 9 3 One 0 10 0 2 0 11 One 2 0 12 0 0 One 13 One 0 One

As can be seen from Table 4, the size of the total control message calculated at any index is less than or equal to M (5 in this embodiment). In addition, the order of these can be arranged in order by connecting Group 1 to Group 3 in the order as in the above example, and the values can be sorted in small order. In contrast, they can be sorted in large order. For example, the order of the size occupied by the total control message (ascending or descending) may be considered.

Example  3

Table 5 below shows the configuration of a control message alignment pattern arranged according to the size occupied by the total control message using Table 4 above. In Table 5, Group 1 is a group of control messages of 1CB size, Group 2 is a group of control messages of 2CB size, and Group 3 represents a group of control messages of 4CB size. In Table 5, Groups 1 to 3 are represented by G1, G2, and G3. The value in parentheses of each group indicates the number of control messages belonging to the group.

Index 2 Total size of control message [Unit: CB] One 2 3 4 5 One G1 (1), G2 (0), G3 (0) G1 (2), G2 (0), G3 (0) G1 (3), G2 (0), G3 (0) G1 (4), G2 (0), G3 (0) G1 (5), G2 (0), G3 (0) 2 - G1 (0), G2 (1), G3 (0) G1 (1), G2 (1), G3 (0) G1 (2), G2 (1), G3 (0) G1 (3), G2 (1), G3 (0) 3 - - - G1 (0), G2 (2), G3 (0) G1 (1), G2 (2), G3 (0) 4 - - - G1 (0), G2 (0), G3 (1) G1 (1), G2 (0), G3 (1)

The thirteen kinds (indexes 1 to 13 in Table 3) in Example 1 are all shown in Table 5 above. Therefore, the generation of the index for indicating the control message configuration may be sequentially generated by referring to the total size of the control message and the value of the index 2 in Table 5 above.

Example  4

Meanwhile, according to another embodiment of the present invention, in order to reduce the number of valid bits of the transmitted index, all possible combinations of groups except for a specific group n may be considered while maintaining the sum of the total control message to be M. The control message corresponding to the excluded Group n may be included in blind decoding. For example, when n = 1, the UE may perform blind decoding on a control message included in Group 1 (1CB size group). Table 6 below shows the configuration of the control message sorting pattern except Group 1.

index Group1 (1CB) Group2 (2CB) Group3 (4CB) 0 0-5 0 0 One 0-3 One 0 2 0 or 1 2 0 3 0 or 1 0 One

That is, if the index is 1 in Table 6, this means that there is one control message of 2CB size, 0 control messages of 4CB size, and there are 0 to 3 control messages of 1CB size. it means. If it is assumed that the base station arranges and transmits control messages in size order, first decode Group 3 and Group 2, and then blindly decode the remaining control messages in units of 1 CB up to the total control message size (M).

Meanwhile, in order to reduce the complexity of blind decoding in units of 1 CB, the base station may further send the following information together with this index.

○ The number of control messages contained 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 occupied by the actual control messages (groups 1 to 3) (ex: CB or resource unit (RU) size)

In the use of the configuration information formed on the same principle, the method of informing and indexing the number of control messages or the size of resources used (for example, the number of CBs or RUs) before transmitting the control message is performed. By notifying the total number of messages or the size thereof in advance, the UE can reduce the effort of additional blind detection.

Meanwhile, the total number or size of control messages may vary depending on the situation of the system. For example, the M value may be changed due to an increase in the bandwidth of the system or the number of control messages to be transmitted to the terminal by the system. Because the methods listed above take into account the total number of cases when the M value changes, for different M values (M ₁ <M ₂ ), the number of cases where M ₁ is considered is the number of cases where M ₂ is considered. Is a subset of the cases. Therefore, we can consider the method of reconstructing the table according to the change of M after preparing the table for the largest M value that the system allows.

For example, in the case of M = 5 in the second embodiment, when the value of the entire table (control message total size 1CB to 5CB) is used as shown in Table 4 above, the total value of the control message when the M value is changed to 4 The index can be reorganized considering only the size of 1CB to 4CB.

This also applies to the case where a specific group is included in the blind decoding in order to reduce the number of effective bits of the index. As in Example 3, considering the case where n = 1, that is, Group 1 (1CB size Group) matters are included in the blind decoding, it is shown in Table 7 below.

Index 2 M [unit: CB] One 2 3 4 5 0 G1 (0 ~ 1), G2 (0), G3 (0) G1 (0 ~ 2), G2 (0), G3 (0) G1 (0 ~ 3), G2 (0), G3 (0) G1 (0 ~ 4), G2 (0), G3 (0) G1 (0 ~ 5), G2 (0), G3 (0) One - G1 (0), G2 (1), G3 (0) G1 (0 ~ 1), G2 (1), G3 (0) G1 (0 ~ 2), G2 (1), G3 (0) G1 (0 ~ 3), G2 (1), G3 (0) 2 - - - G1 (0), G2 (2), G3 (0) G1 (0 ~ 1), G2 (2), G3 (0) 3 - - - G1 (0), G2 (0), G3 (1) G1 (0 ~ 1), G2 (0), G3 (1)

When the M value required by the system is transmitted to all terminals (for example, by 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 area is found by using N instead of M in Table 6. The corresponding index 2 is used to inform the configuration information. Table 8 below is a configuration information table configured by N for the total number of control messages configured in the current frame.

Index 2 N [unit: CB] One 2 3 4 5 0 G1 (1 ~ 1), G2 (0), G3 (0) G1 (1 ~ 2), G2 (0), G3 (0) G1 (1 ~ 3), G2 (0), G3 (0) G1 (1 ~ 4), G2 (0), G3 (0) G1 (1 ~ 5), G2 (0), G3 (0) One - G1 (0), G2 (1), G3 (0) G1 (0 ~ 1), G2 (1), G3 (0) G1 (0 ~ 2), G2 (1), G3 (0) G1 (0 ~ 3), G2 (1), G3 (0) 2 - - - G1 (0), G2 (2), G3 (0) G1 (0 ~ 1), G2 (2), G3 (0) 3 - - - G1 (0), G2 (0), G3 (1) G1 (0 ~ 1), G2 (0), G3 (1)

That is, if N is 5 and index 2 is 1, the configuration information means G1 (0-3), G2 (1), G3 (0), but configuration where N is 3 and index 2 is 1. The information means that G1 (0-1), G2 (1), G3 (0). In this case, when N is 5, 2 bits are required to display index 2, but when N is 3, only 1 bit is required to display index 2. That is, since the effective number of bits for indicating index 2 by determining the value of N is automatically determined by using Table 8, the number of bits necessary for representing the configuration information is reduced.

Meanwhile, Table 7 may be generated from Table 5.

Since the problems due to Group 1 are included in the blind decoding, it can be seen from Table 5 that the area for Group 1 is changed and applied. Therefore, if the system transmits considering the total number of cases as in the second embodiment and the case where blind decoding is included in a specific group as in the third embodiment, the same table can be used.

On the other hand, in the case of considering the total number of possible cases and in case of including some groups in the blind decoding, the system assigns the characteristics of the configuration information to the entire terminal, BCH (Broadcast Channel) or NUSCI (Non-User Specific Control Information). You can tell by using. In this case, the configuration of Table 4 or Table 6 can be used very efficiently.

Meanwhile, in all the above-described methods, the index corresponding to the case where the control message does not exist may be omitted. For example, in the first to third embodiments, if the number of control messages in Groups 1 to 3 is all zero, this index is not necessary if the total number of control messages in each Group is known.

The present invention can be applied to transmission of Unicast Service Control Channels (USCCH) in the IEEE 802.16m standard. USCCH is divided into User-Specific Control Information (USCI) and Non User-Specific Control Information (NUSCI). At this time, each USCI is separately coded when transmitting the USCI. If there is no information in transmitting such USCI, the UE must perform blind detection. In this case, the configuration information according to the above description is transmitted using NUSCI or BCH (broadcast channel). The base station transmits each USCI in descending order by size.

The configuration information formed in the text is described in descending order, but the same can be applied to the ascending order.

Example  5

The M value may actually differ depending on the configuration of the system. Table 9 below shows indices according to various M values that can be configured in the system. Here, G1, G2, G3, G4, and G5 represent cases where the size of the control message is 1 CB, 2 CB, 4 CB, 8 CB, and 16 CB, respectively. Group 1 may be omitted since the terminal performs blind detection from the end of Group 2 to M CB.

Index 2 M [unit: CB] One 2 3 4 5 0 G1 (0 ~ 1), G2 (0), G3 (0), G4 (0), G5 (0)
G1 (0 ~ 2), G2 (0), G3 (0), G4 (0), G5 (0)
G1 (0 ~ 3), G2 (0), G3 (0), G4 (0), G5 (0) G1 (0 ~ 4), G2 (0), G3 (0), G4 (0), G5 (0)
G1 (0 ~ 5), G2 (0), G3 (0), G4 (0), G5 (0)
One - G1 (0), G2 (1), G3 (0), G4 (0), G5 (0)
G1 (0 ~ 1), G2 (1), G3 (0), G4 (0), G5 (0)
G1 (0 ~ 2), G2 (1), G3 (0), G4 (0), G5 (0)
G1 (0 ~ 3), G2 (1), G3 (0), G4 (0), G5 (0)
2 - - - G1 (0), G2 (2), G3 (0), G4 (0), G5 (0)
G1 (0 ~ 1), G2 (2), G3 (0), G4 (0), G5 (0)
3 - - - G1 (0), G2 (0), G3 (1), G4 (0), G5 (0)
G1 (0 ~ 1), G2 (0), G3 (1), G4 (0), G5 (0)

Index 2 M [unit: CB] 6 7 8 9 10 0 G1 (0 ~ 6), G2 (0), G3 (0), G4 (0), G5 (0)
G1 (0 ~ 7), G2 (0), G3 (0), G4 (0), G5 (0) G1 (0 ~ 8), G2 (0), G3 (0), G4 (0), G5 (0) G1 (0 ~ 9), G2 (0), G3 (0), G4 (0), G5 (0) G1 (0 ~ 10), G2 (0), G3 (0), G4 (0), G5 (0) One G1 (0 ~ 4), G2 (1), G3 (0), G4 (0), G5 (0) G1 (0 ~ 5), G2 (1), G3 (0), G4 (0), G5 (0) G1 (0 ~ 6), G2 (1), G3 (0), G4 (0), G5 (0) G1 (0 ~ 7), G2 (1), G3 (0), G4 (0), G5 (0) G1 (0 ~ 8), G2 (1), G3 (0), G4 (0), G5 (0) 2 G1 (0 ~ 2), G2 (2), G3 (0), G4 (0), G5 (0) G1 (0 ~ 3), G2 (2), G3 (0), G4 (0), G5 (0) G1 (0 ~ 4), G2 (2), G3 (0), G4 (0), G5 (0) G1 (0 ~ 5), G2 (2), G3 (0), G4 (0), G5 (0) G1 (0 ~ 6), G2 (2), G3 (0), G4 (0), G5 (0) 3 G1 (0), G2 (3), G3 (0), G4 (0), G5 (0) G1 (0 ~ 1), G2 (3), G3 (0), G4 (0), G5 (0) G1 (0 ~ 2), G2 (3), G3 (0), G4 (0), G5 (0) G1 (0 ~ 3), G2 (3), G3 (0), G4 (0), G5 (0) G1 (0 ~ 4), G2 (3), G3 (0), G4 (0), G5 (0) 4 G1 (0 ~ 2), G2 (0), G3 (1), G4 (0), G5 (0) G1 (0 ~ 3), G2 (0), G3 (1), G4 (0), G5 (0) G1 (0), G2 (4), G3 (0), G4 (0), G5 (0) G1 (0 ~ 1), G2 (4), G3 (0), G4 (0), G5 (0) G1 (0 ~ 2), G2 (4), G3 (0), G4 (0), G5 (0) 5 G1 (0), G2 (1), G3 (1), G4 (0), G5 (0) G1 (0 ~ 1), G2 (1), G3 (1), G4 (0), G5 (0) G1 (0 ~ 4), G2 (0), G3 (1), G4 (0), G5 (0) G1 (0 ~ 5), G2 (0), G3 (1), G4 (0), G5 (0) G1 (0), G2 (5), G3 (0), G4 (0), G5 (0) 6 G1 (0 ~ 2), G2 (1), G3 (1), G4 (0), G5 (0) G1 (0 ~ 3), G2 (1), G3 (1), G4 (0), G5 (0) G1 (0 ~ 6), G2 (0), G3 (1), G4 (0), G5 (0) 7 G1 (0), G2 (2), G3 (1), G4 (0), G5 (0) G1 (0 ~ 1), G2 (2), G3 (1), G4 (0), G5 (0) G1 (0 ~ 4), G2 (1), G3 (1), G4 (0), G5 (0) 8 G1 (0), G2 (0), G3 (2), G4 (0), G5 (0) G1 (0 ~ 1), G2 (0), G3 (2), G4 (0), G5 (0) G1 (0 ~ 2), G2 (2), G3 (1), G4 (0), G5 (0) 9 G1 (0), G2 (0), G3 (0), G4 (1), G5 (0) G1 (0 ~ 1), G2 (0), G3 (0), G4 (1), G5 (0) G1 (0), G2 (3), G3 (1), G4 (0), G5 (0) 10 G1 (0 ~ 2), G2 (0), G3 (2), G4 (0), G5 (0) 11 G1 (0), G2 (1), G3 (2), G4 (0), G5 (0) 12 G1 (0 ~ 2), G2 (0), G3 (0), G4 (1), G5 (0) 13 G1 (0), G2 (1), G3 (0), G4 (1), G5 (0)

Meanwhile, in Table 9, Group 1 in Index 0 is represented as G1 (0 to M). If the number of control messages currently transmitted (or the total size of the control messages) is separately transmitted, G1 (0 to M) of Group 1 shown in index 0 may be expressed as G1 (1 to M). This is because when the number of control messages (or the total size of the control messages) is 0, it can be seen that no control message is sent. In this case, the configuration table can be used as it is applied to convert the Table 7 to Table 8 in the fourth embodiment. That is, the index may be generated based on the total number of control messages currently configured by considering the M value as the N value.

The group setting method as described above may exist in various ways as described below in addition to the size.

The downlink control message is modulated and coded for actual transmission. In this case, the downlink control message may be divided into several subblocks in order to apply the Modulation and Coding Scheme (MCS). For convenience, the downlink control message will be referred to as an downlink control message IE (Information Element), an extended sub block (extended IE), and a control signal actually transmitted after MCS is applied. . In addition, the basic size unit of the allocation IE will be referred to as a minimum A-MAP Logical Resource Unit (MLRU). Control messages are grouped and sent according to a specific purpose, and appropriate information about the grouping is sent. For example, the downlink control message IE may include a DL / UL basic assignment IE, a UL basic assignment IE, and a DL / UL group resource allocation IE. UL group resource allocation IE), downlink / uplink persistent IE (DL / UL persistent IE), etc. can exist in various ways.

As an example of the grouping method, the following cases may be considered.

The first case is a case in which an uplink ACK / NACK channel index is grouped into something that can be used implicitly and not. For example, group 1 may be a downlink basic assignment IE and group 2 may be other types of IEs, and control messages may be grouped into group 1 and group 2.

The second case is a case of grouping a control message of a user who can use an uplink ACK / NACK channel index implicitly and not. For example, group 1 may be a downlink / uplink default assignment IE and group 2 may be other types of IEs to group control messages into group 1 and group 2. In this case, the control message IE of one user may be continuously transmitted.

In the first case and the second case, an example of using the ACK / NACK channel index as "implicit" is to use the order of the control message as the ACK / NACK channel index. That is, when using this grouping method, additional signaling for the ACK / NACK channel index is not necessary.

The third case is a grouping by control message IE size. For example, when the size of the control message IE is 56 bits, the control messages may be grouped into group 1 and group 2 as group 2 when the size of the control message IE is 90 bits.

The fourth case is a case of sending an extension IE separately. That is, the extended IEs can be grouped into group 1, and other types of IEs (eg, basic IEs) can be grouped into group 2 to group control messages into group 1 and group 2. As mentioned above, the extended IE refers to a subblock generated by dividing the original control message into a plurality of original control messages when the original control message has a lot of information and exceeds the length of the basic control message allowed by the system. It is called. In this case, the extended IE divided into a plurality of subblocks may be continuously transmitted.

The fifth case is a case of separately transmitting the same MCS level. For example, group 1 may group control messages into group 1 and group 2 with the MCS level of the control message being QPSK 1/2 and group 2 with the QCSK 1/8 of the control message.

The sixth case is a case in which the size of the allocated IE is transmitted. For example, group 1 may be grouped into 2MLRUs and group 2 is 4MLRUs to group control messages into group 1 and group 2. FIG. Here, the allocation IE means that the MCS is applied to the control message and then allocated to the actual resource region as mentioned above.

The seventh case is a case of using the grouping method of the case 1 to case 6 in combination with each other.

For example, after applying group 3 by applying the control message to the first case, the case 5 may be applied to each group generated by the grouping. For example, group 1 has a 56-bit control message, MCS is QPSK1 / 2, group 2 has a 56-bit control message, MCS is QPSK1 / 8, and group 3 has a control message 90 Bit, MCS is QPSK1 / 2, group 4 is 90 bits in size, and MCS is QPSK1 / 2.

The number of groups described above may vary from case to case, and the purpose may also vary in addition to the methods described above.

Example  6

The group setting method as described above may be configured with a modulation and demodulation coding method (MCS (Modulation and Coding Scheme) level) in addition to the method by the size. In other words, the blind detection is performed by classifying groups according to MCS (Modulation and Coding Scheme) levels of control messages and notifying the terminal of the number of control messages for each group.

For example, assuming that control messages can be modulated and coded into Quadrature Phase Shift Keying (QPSK) 1/16 (MCS4), QPSK 1/8 (MCS3), QPSK 1/4 (MCS2) and QPSK 1/2 (MCS1). The number of control messages for each MCS level is used as the configuration information, and the index is generated and transmitted in the manner described above.

On the other hand, when the base station transmits configuration information according to size, the blind detection is made easier by sorting by MCS level (sorted from MCS1 to MCS4 or MCS4 to MCS1) in each group classified by size. . On the other hand, when the group is configured by MCS level, the blind detection is made easier by transmitting the data by sorting them in descending or descending order.

Meanwhile, in such group-specific transmission, the actual number of control messages for each group may be directly signaled.

As an example of the control message described above, A-MAP (Advanced Map) Information Element (IE) of the IEEE802.16m system may be considered. Group by size of A-MAP resource unit (hereinafter referred to as A-MAP IE allocation unit) allocated to actual A-MAP channel after modulation-modulation coding is applied to A-MAP IE In this configuration, the size of the A-MAP IE allocation unit existing in each group can be set to be the same. 5 is a diagram illustrating a control message alignment pattern according to an embodiment of the present invention. As shown in FIG. 5, after the demodulation coding is applied, the A-MAP IE allocation units may be sorted by size and the A-MAP IE allocation units of the same size may be grouped.

In addition, after the demodulation coding is applied to the A-MAP IE, the A-MAP IE allocation units allocated to the actual A-MAP channel are sorted by size, and the A-MAP in the A-MAP IE allocation units having the same size. It is possible to sort IE allocation units by MCS level.

6 illustrates a control message alignment pattern according to an embodiment of the present invention. As illustrated in FIG. 6, A-MAP IE allocation units having the same MCS level as the size of the same A-MAP IE allocation unit may be set as a group. The A-MAP IE exists in a size of 1 MLRU (Minimum A-MAP Logical Resource Unit) and 2 MLRU. The A-MAP IE has a modulation / modulation coding of QPSK1 / 2 and QPSK 1/4 (MCS can be applied differently). Assuming that it is performed, the size of the A-MAP IE allocation unit allocated to the actual A-MAP channel is 1MLRU, 2MLRU, 4MLRU. The MLRU is a size unit of the A-MAP IE. At this time, the 1-MLRU size A-MAP IE allocation unit exists in that 1-MLRU A-MAP IE is modulated and coded by QPSK1 / 2, and the 2-MLRU size A-MAP IE allocation unit has a 2-MLRU A-MAP IE assigned to QPSK1 / 2. The modulation-modulated coded and 1-MLRU A-MAP IEs are modulated-coded to QPSK1 / 4, and the 4-MLRU-sized A-MAP IE allocation unit exists as 2-MLRU's A-MAP IEs are modulated-coded to QPSK1 / 4. Therefore, a total of four groups exist, and in order to facilitate blind detection, index information defined by each group size (or the number of A-MAP IE allocation units) or a specific pattern may be transmitted. The information may be transmitted through non-user specific A-MAP.

On the other hand, if the A-MAP IE allocation unit is grouped by MCS level, the size of each A-MAP IE allocation unit in the group may be different, but the MCS level of the A-MAP IE allocation unit in the group is set to be the same. Can be. 7 illustrates a control message alignment pattern according to an embodiment of the present invention. In FIG. 7, the A-MAP IE allocation unit after the modulation-modulation coding is applied to the A-MAP IE is configured into groups for each MCS level.

In addition, after modulation-modulation coding is applied to the A-MAP IE, the A-MAP IE allocation units allocated to the actual A-MAP channel are sorted by MCS level, and then by size in the A-MAP IE allocation units having the same MCS level. You can rearrange it. 8 illustrates a control message alignment pattern according to an embodiment of the present invention. As shown in FIG. 8, A-MAP IE allocation units having the same MCS level as the size of the same A-MAP IE allocation unit may be set as a group. Assuming that A-MAP IE allocation units exist in sizes of 1 MLRU and 2MLRU and that these IEs are subjected to modulation and demodulation coding to QPSK1 / 2 and QPSK 1/4 (the type of MCS can be applied differently), the actual A-MAP The size of the A-MAP IE allocation unit allocated to the channel is 1MLRU, 2MLRU, and 4MLRU. At this time, the 1-MLRU size A-MAP IE allocation unit exists in that 1-MLRU A-MAP IE is modulated and coded by QPSK1 / 2, and the 2-MLRU size A-MAP IE allocation unit has a 2-MLRU A-MAP IE assigned to QPSK1 / 2. The modulation-modulated coded and 1-MLRU A-MAP IEs are modulated-coded to QPSK1 / 4, and the 4-MLRU-sized A-MAP IE allocation unit exists as 2-MLRU's A-MAP IEs are modulated-coded to QPSK1 / 4. Therefore, a total of four groups exist, and in order to facilitate blind detection, the group is transmitted through index information defined by a size (or number of A-MAP IE allocation units) or a specific pattern for each group. This information may be transmitted via Non-user specific A-MAP.

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

Assuming the IEEE802.16m system, the information can be transmitted using a non-user specific A-MAP or Superframe Header.

At this time, if a user-specified A-MAP is applied to multiple frequency partitions such as Fractional Frequency Reuse (FFR), if a user-specified A-MAP exists in each partition, A Consider the case in which the user-specific A-MAP assigned to the other partition is notified of the MAP configuration information, and the case where one unspecified A-MAP exists for each reuse area. When a user-specific A-MAP exists for each partition, the A-MAP configuration information of the corresponding partition proposed by the present invention is transmitted from the corresponding partition.

On the other hand, if the user unspecified A-MAP does not exist in all partitions, A-MAP configuration information in any partition may be informed by the user unspecified A-MAP assigned to another partition. For example, consider the case where reuse 1 zone and reuse 3 are applied at the same time, user-specific A only in the specific power-boosting reuse-N zone or reuse 1 zone. -MAP can be considered, in which case A-MAP configuration information for each partition (user size or number of A-MAP IE allocation units or the index generation method described above) can be considered. Index information) may be applied. In addition, when both the specific power-boosted reuse-N area and the reuse 1 area transmit user unspecified A-MAP, A-MAP information corresponding to the partition may be informed by user unspecified A-MAP of the partition.

A group may be defined as the total size of A-MAP IE allocation units for each partition. In other words, if a total of four partitions are configured by applying multiple partitions, four groups exist, and each partition has information on the size of each group (or the number of A-MAP IE allocation units) or index information using the index generation method described above. The user may inform the terminal using the unspecified A-MAP or SFH.

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

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

The number of FPs that can be considered for reasons such as FFR can be determined by the method of operation. For example, if the FFR method is applied to FFR 1/3 (meaning that the frequency reuse rate related to FFR is 1/3), FP is three, and if FFR 1/3 and FFR 1 are applied, There are four FPs.

In addition, in consideration of characteristics of the FP (for example, power boosting), a specific MCS level may be limited for each FP. For example, apply QPSK 1/2 for power-boosted FPs and limit them, apply QPSK 1/2 and / or QPSK 1/8 for FFR 1 regions, and QPSK 1/8 for power-down FPs. Can be applied.

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

In addition, when grouping and transmitting control messages, the grouping method proposed in the present invention can be applied to the FP in which the control message exists.

Hereinafter, examples of transmitting and grouping control messages in a system using FFR will be described.

In the first example, it is assumed that two types of A (Assignment) -A-MAP IEs exist, A type and B type, the number of FPs is 1 (applied to FRR 1), and the available MCS is QPSK 1 /. 2 and QPSK 1/8 apply. QPSK 1/2 and QPSK 1/8 are applied to Type A, respectively, to generate 1MLRU allocation unit and 4MLRU allocation unit, and BPS is applied to QPSK 1/2 and QPSK 1/8, respectively, to 2MLRU allocation unit and 8MLRU, respectively. The allocation unit is created. Therefore, after MCS is applied, there are 1, 2, 4, and 8 MLRUs (Minimum A-MAP Logical Resource Units) of an allocation unit of the A-MAP IE. The generated 1MLRU may be set to Group 1, 2MLRU may be set to Group 2, 4MLRU may be set to Group 3, and 8MLRU may be set to Group 4. In this case, the maximum number of A-A-MAP IEs that can be transmitted may be determined by the size of the resource region allocated for A-A-MAP. 9 is a diagram illustrating a control message alignment pattern when FFR is applied according to an embodiment of the present invention. As illustrated in FIG. 9, the generated MLRU may map resources of the same MCS level and the same IE size to each group of logically consecutive MLRUs.

In the second example, it is assumed that two types of A-A-MAP (Assignment) IEs exist, A type and B type, and the number of FPs is 3 (applied to FRR 1/3). In addition, A-A-MAP exists only in the power boosted area and the MCS used is limited to QPSK 1/2. QPSK 1/2 is applied to each of Type A and Type B to generate 1MLRU allocation unit and 2MLRU allocation unit. Thus, after MCS application, 1MLRU and 2MLRU exist in the allocation unit of A-A-MAP IE. The generated 1MLRU allocation unit may be set to group 1, and the 2MLRU allocation unit may be set to group 2. 10 is a diagram illustrating a control message alignment 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 may be mapped to each group of logically consecutive MLRUs.

In the third example, it is assumed that two types of A (Assignment) -A-MAP IEs exist, A type and B type, and the number of FP is 4 (FFR 1/3 and FFR 1 applied). In addition, in consideration of the characteristics (eg, power boosting) of the FP, it is limited to a specific MCS level for each FP. For example, the available MCS applies QPSK 1/2 to the power boosted region of FFR 1/3 and QPSK 1/8 to the FFR 1 region. In the power boosting area of FFR 1/3, QPSK 1/2 is applied to Type A and Type B, respectively, to generate 1MLRU allocation unit and 2MLRU allocation unit, respectively. In FFR 1 area, QPSK 1/8 is applied to Type A and B type. 4MLRU allocation units and 8MLRU allocation units are generated, respectively. Therefore, in this case, after MCS is applied, there are 1, 2, 4, and 8 MLRUs (Minimum A-MAP Logical Resource Units) of the allocation unit of the A-MAP IE. The generated 1MLRU may be set to Group 1, 2MLRU may be set to Group 2, 4MLRU may be set to Group 3, and 8MLRU may be set to Group 4. 11 is a diagram illustrating a control message alignment pattern when FFR is applied according to an embodiment of the present invention. As illustrated in FIG. 11, the generated MLRU may map resources of the same MCS level and the same IE size to each group of logically consecutive MLRUs.

In the fourth example, it is assumed that two types of A (Assignment) -A-MAP IEs exist, A type and B type, and the number of FPs is 4 (FFR 1/3 and FFR 1 applied). In addition, in consideration of the characteristics (eg, power boosting) of the FP, it is limited to a specific MCS level for each FP. For example, the available MCS is QPSK 1/2 applied to the power boosted region of FFR 1/3 and QPSK 1/2 and QPSK 1/8 to the FFR 1 region. In the power boosting area of FFR 1/3, QPSK 1/2 is applied to type A and B, respectively, to generate 1MLRU allocation unit and 2MLRU allocation unit, and in FFR 1 area, QPSK 1/2 is applied to type A and B type. 1MLRU allocation unit and 2MLRU allocation unit are generated respectively, and QPSK 1/8 is applied to A type and B type to generate 4MLRU allocation unit and 8MLRU allocation unit, respectively.

In this case, after MCS is applied, there are 1, 2, 4, and 8 MLRUs (Minimum A-MAP Logical Resource Units) of an allocation unit of the A-MAP IE. 1MLRU allocation unit of the power boosting region of the FFR 1/3 is set to group 1, 2MLRU is set to group 2, 1MLRU allocation unit of the FFR 1 region is group 3, 2MLRU is group 4, 4MLRU is group 5, 8MLRU Can be set to group 6. 12 illustrates a control message alignment pattern when FFR is applied according to an embodiment of the present invention. As illustrated in FIG. 12, the generated MLRU may map resources consisting of the same MCS level and the same IE size to each group of logically consecutive MLRUs. At this time, even if the same MCS level and the same IE size, even if present in different FP can be mapped to different groups.

In the fifth example, it is assumed that two types of A (Assignment) -A-MAP IEs exist, A type and B type, and the number of FPs is 4 (FFR 1/3 and FFR 1 applied). The same MCS level can be defined for all FPs, and the power level can be adjusted as necessary to maintain link performance. For example, you can use QPSK 1/2 as the available MCS. In the power boosting area of FFR 1/3, QPSK 1/2 is applied to type A and B, respectively, to generate 1MLRU allocation unit and 2MLRU allocation unit, and in FFR 1 area, QPSK 1/2 is applied to type A and B type. 1MLRU allocation unit and 2MLRU allocation unit are generated respectively.

In this case, even if the A-A-MAP is made of the same MCS level and the same IE size, if the A-A-MAP exists in different FPs, it can be configured into different groups. Accordingly, the 1MLRU allocation unit of the power boosting region of the FFR 1/3 may be set to Group 1, the 2MLRU may be set to Group 2, the 1MLRU allocation unit of the FFR 1 region may be set to Group 3, and the 2MLRU may be set to Group 4. have. 13 is a diagram illustrating a control message alignment pattern when FFR is applied according to an embodiment of the present invention. As illustrated in FIG. 13, the generated MLRU may map resources of the same MCS level and the same IE size to each group of logically consecutive MLRUs. At this time, even if the same MCS level and the same IE size, even if present in different FP can be mapped to different groups.

That is, when there are a plurality of FPs due to the above-described FFR, the above-described grouping method may be applied in the FP to which the control message belongs, as an example of the grouping method. It can be used.

Hereinafter, a method of signaling a method of transmitting an A-A-MAP IE on a control channel that broadcasts to a plurality of terminals will be described. If various FPs are allowed in the system, there is a need for a method of efficiently signaling them. For example, the number of allocation units of the A-A-MAP IE for each group or the size of each group may be signaled. Alternatively, the number of all possible A-A-MAP IE allocation units in each group may be tabulated and the index corresponding to the corresponding transmission method may be signaled. In this case, the maximum number of MLRUs (for example, the maximum number of MLRUs is 16, 17, 18, 19, 20, 21, 23, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42) Each table can be created separately, and an index can be selected and transferred from the table that matches the transfer method.

Hereinafter, it will be described on the premise of creating a table and signaling an index.

In the first case, a common superset table irrespective of the FP configuration may be created to use an index of the table. For example, even if the number of FPs is 1, 3, or 4, a table that can be applied to all of them can be created. To this end, it is possible to create a table of superset concepts covering all groups that may appear when the number of FP is 1, 3 or 4. At this time, the superset is determined according to the transmission method. For example, in order to cover all the first, second and third examples described above, a superset table applicable to a total of four groups is prepared. In addition, in order to cover all the 1st, 2nd, and 5th example, the superset table applicable to a total of 4 groups is created. In order to cover all of the first, second and fourth examples, a superset table applicable to a total of six groups is prepared.

In the second case, a superset table may be created, and indexes related to a specific FP may be signaled as a subset of the superset table. For example, if there is a superset table applicable to a total of four groups in order to cover all of the first, second and third examples, the superset for the first and third examples is present. In the second example, the indexes may be selectively extracted and signaled from the superset table.

In the third case, tables may be individually generated and used according to the FP configuration. That is, different tables can be applied according to FP. For example, in a system where the number of FPs is 1, 3, or 4, an optimal table for each case is generated and an index is signaled in the table. At this time, the generation principle of the table is the same as the method described above. In the case of the first example, a corresponding index may be signaled in a table generated using the number or group size of each unit of four groups. In addition, in the case of the second example, the corresponding index may be signaled in a table generated using the number or the size of each unit of two groups. In addition, in the case of the third to fifth examples, the corresponding index may be signaled in the table generated using the number or size of each group.

The number of FPs or types of tables to be used may be broadcast to each terminal through a broadcast channel (BCH), or may be signaled using a user unspecified control message in the A-MAP before the index is used.

In the fourth case, a table may be generated by merging groups having the same characteristics (for example, the same MCS and / or IE size) among groups existing in each FP. For example, in the fourth or fifth example, group 3 has the same characteristics as group 1 and group 4 with group 2. In this case, it is possible to create a table in which Group 1 and Group 3 are merged into Group A, and Group 2 and Group 4 are merged into Group B. However, in this case, the complexity of the blind detection may increase than before integrating the table in the FP in which the terminal first decodes the control message.

On the other hand, in addition to the criteria for grouping the control message described so far, it can be grouped by the purpose of the control message, for example, uplink allocation, downlink allocation or downlink persistent allocation (persistent) allocation.

In the above description, the grouping criteria are mainly based on the size of the control message or the MCS level, but the criteria constituting the group are not limited to the above examples, and grouping is possible based on various criteria. Applicable to various criteria. The table generation method and signaling method supporting various FPs can be used in combination with the table generation method supporting various band and control signaling periods. The table generation method is applicable to not only a method for generating a table considering all possible combinations for each group, but also a method for reducing signaling overhead.

As described above, it is possible to facilitate blind detection by minimizing the overhead by informing the user in advance about the alignment pattern of the control message before transmitting the control message. Therefore, the complexity and time for acknowledging the control message can be reduced.

14 is a block diagram illustrating a configuration of a device applicable to a base station and a user equipment and capable of performing the above-described method. As shown in FIG. 14, the device 60 includes a processing unit 61, a memory unit 62, a radio frequency (RF) unit 63, a display unit 64, and a user interface unit 65. . The layer of physical interface protocol is performed in the processing unit 61. The processing unit 61 provides a control plane and a user plane. The function of each layer can be performed in the processing unit 61. The memory unit 62 is electrically connected to the processing unit 61 and stores an operating system, an application, and a general file. If the device 60 is a user device, the display unit 64 may display a variety of information, and may be implemented by using a known liquid crystal display (LCD), an organic light emitting diode (OLED), or the like. The user interface unit 65 can be configured in combination with known user interfaces such as keypads, touch screens, and the like. The RF unit 63 is electrically connected to the processing unit 61 and transmits or receives a radio signal.

In the present specification, embodiments of the present invention have been described based on data transmission / reception relations between a base station and a terminal. Herein, the base station is a terminal node of a network that directly communicates with the terminal. The specific operation described as performed by the base station in this document 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 consisting of a plurality of network nodes including a base station can be performed by a base station or other network nodes other than the base station. In this case, the base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), and an access point. In addition, in the present invention, the terminal corresponds to a mobile station (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). Can be replaced by the term

Also, the transmitting end refers to a node that transmits data or voice service, and the receiving end refers to a node that receives data or voice service. Therefore, in uplink, a terminal may be a transmitting end and a base station may be a receiving end. Similarly, in the downlink, the terminal may be the receiving end and the base station may be the transmitting end.

Meanwhile, the mobile terminal of the present invention may be a PDA (Personal Digital Assistant), a cellular phone, a PCS (Personal Communication Service) phone, a GSM (Global System for Mobile) phone, a WCDMA (Wideband CDMA) Etc. may be used.

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

For a hardware implementation, the method according to embodiments of the present invention may be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) , Field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, the method according to embodiments of the present invention may be implemented in the form of a module, a procedure or a function for performing the functions or operations described above. The software code can be stored in a memory unit and driven by the processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various well-known means.

The present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the foregoing detailed description should not be construed in a limiting sense in all respects, but should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention. In addition, claims that do not have an explicit citation in the claims may be combined to form an embodiment or included in a new claim by amendment after the application.

The present invention can be used for a terminal or a network device used in a wireless access system.

1 is a block diagram of a transmission resource for transmitting a control message.

2 illustrates an example of generating control message configuration information.

3 shows an example of a pattern of configuration information of a control message according to the present invention.

4 illustrates an example of configuration information of a control message for reducing the number of valid bits for transmission of control message configuration information.

5 is a diagram illustrating a control message alignment pattern according to an embodiment of the present invention.

6 illustrates a control message alignment pattern according to an embodiment of the present invention.

7 illustrates a control message alignment pattern according to an embodiment of the present invention.

8 illustrates a control message alignment pattern according to an embodiment of the present invention.

9 to 13 illustrate a control message alignment pattern when FFR is applied according to an embodiment of the present invention.

14 is a block diagram illustrating a configuration of a device applicable to a base station and a user equipment and capable of performing the above-described method.

Claims (10)

A method for transmitting a control message by a base station in a wireless communication system, Grouping a plurality of control messages for at least one user equipment into X (X is a positive integer) control message groups according to a Modulation and Coding Scheme (MCS) level for the plurality of control messages; Transmitting control message configuration information including information on the number of control messages included in each of the X control message groups to the at least one user device through a user non-specific control message; And Transmitting the X control message groups to the at least one user device according to the control message configuration information, The MCS level modulation method for the plurality of control messages is Quadrature Phase Shift Keying (QPSK), The information on the number of control messages included in each of the X control message groups may include information about a control message included in each index G _x (G _x is in control message group x (x = 1, ..., X). An index corresponding to a combination of the number of control messages included in each of the X control message groups among a plurality of indices corresponding to one of the possible combinations of How to send control message. The method of claim 1, The plurality of control messages are transmitted in alignment according to the Modulation and Coding Scheme (MCS) level for the plurality of control messages. How to send control message. The method of claim 1, At least one of the plurality of indices corresponds to one combination representing more than one of the possible combinations such that the total number of the plurality of indices is less than the total number of possible combinations of G _x , How to send control message. 4. The method according to any one of claims 1 to 3, Each of the X control message groups includes logical or physically contiguous resource units, How to send control message. A method for receiving a control message from a base station by a user equipment in a wireless communication system, Receiving, from the base station, control message configuration information regarding the plurality of control messages grouped into X control message groups according to MCS levels for a plurality of control messages; Receive the X group of control messages from the base station; And Decoding a control message included in at least one of the X control message groups based on the control message configuration information, The MCS level modulation method for the plurality of control messages is Quadrature Phase Shift Keying (QPSK), The control message configuration information includes information on the number of control messages included in each of the X control message groups, The information on the number of control messages included in each of the X control message groups may include information about a control message included in each index G _x (G _x is in control message group x (x = 1, ..., X). An index corresponding to a combination of the number of control messages included in each of the X control message groups among a plurality of indices corresponding to one of the possible combinations of How to receive control message. The method of claim 5, The plurality of control messages are received in a sorted state according to the Modulation and Coding Scheme (MCS) level for the plurality of control messages. How to receive control message. The method of claim 5, At least one of the plurality of indices corresponds to one combination representing more than one of the possible combinations such that the total number of the plurality of indices is less than the total number of possible combinations of G _x , How to receive control message. 8. The method according to any one of claims 5 to 7, Each of the control message groups includes logical or physically contiguous resource units. How to receive control message. In the base station transmits a control message in a wireless communication system, A radio frequency (RF) unit and a processing unit configured to control the RF unit, The processing unit groups a plurality of control messages for at least one user equipment into X (X is a positive integer) control message groups according to a Modulation and Coding Scheme (MCS) level for the plurality of control messages; The RF unit is configured to transmit control message configuration information including information on the number of control messages included in each of the X control message groups to the at least one user device through a user non-specific control message. Control; And control the RF unit to transmit the X control message groups to the at least one user device according to the control message configuration information. The MCS level modulation method for the plurality of control messages is Quadrature Phase Shift Keying (QPSK), The information on the number of control messages included in each of the X control message groups may include information about a control message included in each index G _x (G _x is in control message group x (x = 1, ..., X). An index corresponding to a combination of the number of control messages included in each of the X control message groups among a plurality of indices corresponding to one of the possible combinations of Base station. When the user equipment receives a control message from a base station in a wireless communication system, A radio frequency (RF) unit and a processing unit configured to control the RF unit, The processing unit controls the RF unit to receive, from the base station, control message configuration information about the plurality of control messages grouped into X control message groups according to MCS levels for a plurality of control messages; Control the RF unit to receive the X groups of control messages from the base station; And decoding a control message included in at least one of the X control message groups based on the control message configuration information. The MCS level modulation method for the plurality of control messages is Quadrature Phase Shift Keying (QPSK), The control message configuration information includes information on the number of control messages included in each of the X control message groups, The information on the number of control messages included in each of the X control message groups may include information about a control message included in each index G _x (G _x is in control message group x (x = 1, ..., X). An index corresponding to a combination of the number of control messages included in each of the X control message groups among a plurality of indices corresponding to one of the possible combinations of Base station.

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