WO2011139066A2 - Device and method for transmitting downlink control information in a wireless communication system - Google Patents

Abstract

The present invention relates to a device and method for transmitting downlink control information in a wireless communication system. As such, the present description provides a method for transmitting downlink control information by means of a base station. The disclosed method comprises the steps of: configuring downlink control information comprising a resource allocation field displaying resource indicating values in a specific range; and transmitting the downlink control information to a terminal over a physical downlink control channel. According to the present invention, resource indicating values that are not being used in a resource allocation field can be utilized to configure new downlink control information and formats, or the same can be used in the transmission of new data such that it is possible to achieve compatibility with the control information and formats of existing systems, and a new control channel can be configured without any great increase in complexity.

Description

Apparatus and method for transmitting downlink control information in wireless communication system

The present invention relates to wireless communication, and more particularly, to an apparatus and method for transmitting downlink control information in a wireless communication system.

In general, the base station can know the downlink channel state by the terminal informs the base station of a well-known control signal such as a channel quality indicator (CQI). The base station may perform frequency selective scheduling by receiving a downlink channel state from each terminal. However, in order to perform frequency selective scheduling on the uplink channel, the base station needs to know the uplink channel state.

The uplink reference signal is a signal known between both the base station and the terminal and is also called a pilot. The uplink reference signal includes a demodulation reference signal and a sounding reference signal (SRS). The demodulation reference signal is used for channel estimation for data demodulation, and the sounding reference signal is used for user scheduling in uplink. The terminal sends a sounding reference signal through the uplink channel, and the base station determines uplink channel state from the sounding reference signal and performs uplink scheduling.

Meanwhile, data or various uplink control information as well as a sounding reference signal are transmitted through the uplink control channel. The uplink control signal includes an acknowledgment (ACK) / not-acknowledgement (NACK) signal for performing a hybrid automatic repeat request (HARQ), a channel quality indicator (CQI) indicating downlink channel quality, a precoding matrix index (PMI), There are various types such as RI (Rank Indicator).

1 is an example of an uplink subframe structure for transmitting a sounding reference signal to which the present invention is applied.

Referring to FIG. 1, an uplink subframe includes two slots on a time axis, and each slot includes seven single carrier-frequency division multiple access (SC-FDMA) symbols. The uplink subframe includes a physical uplink control channel (PUCCH) and a physical uplink shared channel (PUSCH) on the frequency axis. The PUCCH in the SC-FDMA symbol interval in which the sounding reference signal is transmitted is punctured. In this case, the UE transmits data using 13 SC-FDMA symbols and performs a preprocessing process such as rate matching for the last one SC-FDMA symbol and transmits a sounding reference signal. Although the 14th SC-FDMA symbol is determined to transmit a sounding reference signal, this is just an example, and the position and number of SF-FDMA symbols may be determined differently. The sounding reference signal may be transmitted in the entire PUSCH or may be transmitted in only part of the PUSCH.

One of the new schemes considered in LTE-A (Advanced) is an aperiodic sounding reference signal (A-SRS). In the aperiodic sounding reference signal, since the terminal may transmit the sounding reference signal aperiodically, the resource may be used more efficiently than when the sounding reference signal is periodically transmitted. In relation to the transmission of the aperiodic sounding reference signal, the base station should instruct the terminal to transmit the sounding reference signal or inform the information related to the transmission of the sounding reference signal.

Although the aperiodic sounding reference signal is taken as a specific example, downlink control information must be added to handle other new procedures or new information required with the appearance of a new system. To do this, keep the format compatible with the existing system, but consider adding new fields. However, the format of the downlink control information of the existing LTE is very limited, and there is little room for adding a new field. In addition, even if a new field is added, this causes a problem of a burden of blind decoding of the UE. Therefore, even if new downlink control information to be applied to a new system is added, there is a need for an apparatus and a method for transmitting downlink control information to minimize and change the structure of an existing system.

An object of the present invention is to provide an apparatus and method for transmitting downlink control information in a wireless communication system.

Another technical problem of the present invention is to provide a new control channel configuration method for uplink scheduling information in a wireless communication system.

Another technical problem of the present invention is to provide a method for transmitting an uplink signal in a wireless communication system.

Another technical problem of the present invention is to provide a method of configuring resource allocation information for discontinuous resource allocation in a wireless communication system.

According to an aspect of the present invention, a method for transmitting downlink control information by a base station is provided. The method includes configuring downlink control information including a resource allocation field indicating a resource indication value of a specific range, and converting the downlink control information into a physical downlink control channel: Transmitting to the terminal on the PDCCH).

The resource indication value of the specific range may indicate that the downlink control information includes configuration information for transmission of an uplink signal.

According to another aspect of the present invention, a method for receiving downlink control information by a terminal is provided. The method includes receiving downlink control information including a resource allocation field indicating a resource indication value of a specific range from a base station on a PDCCH, and using the format of the downlink control information based on the resource indication value of the specific range ( interpreting a format), and decoding the downlink control information according to the interpreted format.

According to another aspect of the present invention, an apparatus for transmitting downlink control information is provided. The apparatus includes a downlink control information configuration unit constituting downlink control information based on a resource indication value of a specific range represented by a resource allocation field, a control channel configuration unit constituting a PDCCH to transmit the downlink control information, and And a control channel transmitter for transmitting the downlink control information to the terminal on the PDCCH.

The downlink control information may include information indicating the transmission of an uplink signal by the terminal.

According to another aspect of the present invention, there is provided an apparatus for receiving downlink control information. The apparatus includes a control channel receiver for receiving downlink control information from a base station on a PDCCH, a control channel decoder for extracting the downlink control information by performing blind decoding on the control channel, and the downlink The resource allocation field is separated from a plurality of fields included in the control information, the format of the downlink control information is determined by using the resource indication value indicated by the resource allocation field, and an analysis method suitable for the determined format is used. And a downlink control information analyzer for analyzing the downlink control information.

According to another aspect of the present invention, a method of transmitting downlink control information is provided. The method may include configuring information about an uplink signal or information about a downlink signal using a specific range selected from a full range of resource indication values represented by a resource allocation field. Transmitting downlink control information including information about the downlink signal or information about the downlink signal to the terminal, and receiving the uplink signal from the terminal based on the information on the uplink signal, or the downlink And transmitting the downlink signal to the terminal based on the information about the signal.

The information on the uplink signal is resource allocation information indicating allocation of a resource block for transmission of an uplink signal, and the selected specific range may indicate a resource block allocated according to a non-contiguous allocation scheme. have.

The configuring of the information on the uplink signal or the information on the downlink signal may be performed on the information on the uplink signal or the downlink signal by using the redundant bits included in the selected specific range and the downlink control information. It includes organizing information.

The configuring of the information on the uplink signal or the information on the downlink signal may include: adapting a variable setting of the purpose according to the selected specific range, the redundant bits included in the downlink control information, and the redundant bits. It may include configuring information about the uplink signal or information about the downlink signal using the red field.

When the excess bit indicates that allocation of a resource block for transmission of the uplink signal is contiguous, the adaptive field may indicate whether frequency hopping is applied to the uplink transmission.

When the surplus bit indicates that the allocation of the resource block for the transmission of the uplink signal is performed discontinuously, the adaptive field and the resource allocation field may represent the resource indication value.

The information on the uplink signal is resource allocation information indicating an allocation of a resource block group for transmitting an uplink signal, and the selected specific range may indicate a resource block allocated according to a discontinuous allocation method. Can be.

The information about the uplink signal is resource allocation information indicating a resource block allocated for transmission of an uplink signal, and the allocated resource block is divided into a resource block of a first part and a resource block of a second part. A non-contiguous allocation scheme may be applied to the resource block of the first portion, and a continuous allocation scheme may be applied to the resource block of the second portion.

The resource block of the first part is a predetermined number of resource blocks constituting a start part and an end part of the allocated resource block, and the resource block of the second part is the start part and the end part of the allocated resource block. It may be the remainder except a predetermined number of resource blocks constituting a.

The information on the uplink signal is resource allocation information indicating a resource block group allocated for transmission of an uplink signal, and the allocated resource block group is divided into resource block groups of a first part and resource block groups of a second part. The non-contiguous allocation scheme may be applied to the resource block group of the first portion, and the continuous allocation scheme may be applied to the resource block group of the second portion.

The resource block group of the first portion is a predetermined number of resource block groups constituting a start portion and an end portion of the allocated resource block group, and the resource block group of the second portion is the start of the allocated resource block group. It may be the rest except for a predetermined number of resource block groups constituting the end portion and the end portion.

The information on the uplink signal is resource allocation information indicating allocation of a resource block for transmission of an uplink signal, and the selected specific range may indicate a resource block allocated according to a discontinuous allocation method.

The configuring of the information on the uplink signal may include configuring the information on the uplink signal using the selected specific range and the redundant bits included in the downlink control information.

The configuring of the information on the uplink signal may include the uplink using the selected specific range, the redundant bits included in the downlink control information, and the adaptive field whose use is variably set according to the redundant bits. And configuring information about the link signal.

When the surplus bits indicate that allocation of resource blocks for transmission of the uplink signal is contiguous, the adaptive field may indicate whether frequency hopping is applied to the uplink transmission.

When the surplus bit indicates that the allocation of the resource block for the transmission of the uplink signal is performed discontinuously, the adaptive field and the resource allocation field may represent the resource indication value.

The information on the uplink signal is resource allocation information indicating allocation of a resource block group for transmission of an uplink signal, and the selected specific range may indicate a resource block allocated according to a discontinuous allocation method.

The information about the uplink signal is resource allocation information indicating a resource block allocated for transmission of an uplink signal, and the allocated resource block is divided into a resource block of a first part and a resource block of a second part. A non-contiguous allocation scheme may be applied to the resource block of the first portion, and a continuous allocation scheme may be applied to the resource block of the second portion.

The resource block of the first part is a predetermined number of resource blocks constituting a start part and an end part of the allocated resource block, and the resource block of the second part is the start part and the end part of the allocated resource block. It may be the remainder except a predetermined number of resource blocks constituting a.

The information on the uplink signal is resource allocation information indicating a resource block group allocated for transmission of an uplink signal, and the allocated resource block group is divided into resource block groups of a first part and resource block groups of a second part. The non-contiguous allocation scheme may be applied to the resource block group of the first portion, and the continuous allocation scheme may be applied to the resource block group of the second portion.

The resource block group of the first portion is a predetermined number of resource block groups constituting a start portion and an end portion of the allocated resource block group, and the resource block group of the second portion is the start of the allocated resource block group. It may be the rest except for a predetermined number of resource block groups constituting the end portion and the end portion.

According to another aspect of the present invention, a method for receiving downlink control information is provided. The method includes receiving downlink control information including information about an uplink signal from a base station, and transmitting the uplink signal to the base station based on the information about the uplink signal. The information on the uplink signal is configured using a specific range selected from all resource indication values represented by the resource allocation field.

According to another aspect of the present invention, an apparatus for transmitting downlink control information is provided. The apparatus includes a downlink control information constructing unit constituting a field of downlink control information using a specific range selected from resource indication values represented by a resource allocation field, and the downlink control information according to the configured field. And a control unit for configuring a control channel to be transmitted, and a transmission unit for transmitting the downlink control information to the terminal through the control channel. The downlink control information includes information instructing transmission of an uplink signal by the terminal.

According to another aspect of the present invention, an apparatus for transmitting downlink control information is provided. The apparatus includes a downlink control information constructing unit constituting a field of downlink control information using a specific range selected from resource indication values represented by a resource allocation field, and the downlink control information according to the configured field. And a control channel transmitter configured to configure a control channel to be transmitted, and a control channel transmitter configured to transmit the downlink control information to the terminal through the control channel. The downlink control information includes information instructing transmission of an uplink signal by the terminal.

It is possible to compose a format of new downlink control information or to transmit new information by using a resource indication value not used in the resource allocation field, so that it is compatible with the format of control information of an existing system and increases the complexity. A new control channel can be configured without.

1 is an example of an uplink subframe structure for transmitting a sounding reference signal.

2 shows a wireless communication system to which the present invention is applied.

3 shows a structure of a radio frame to which the present invention is applied.

4 shows a structure of a downlink subframe to which the present invention is applied.

5 is an exemplary diagram illustrating a resource grid for one downlink slot to which the present invention is applied.

6 is an example of a resource allocation method to which the present invention is applied. This is type 0 resource allocation.

7 is another example of a resource allocation method to which the present invention is applied.

8 is another example of a resource allocation method to which the present invention is applied.

9 is a block diagram illustrating a DCI transmitter and a DCI receiver according to an embodiment of the present invention.

10 is a flowchart illustrating a method of transmitting DCI according to an embodiment of the present invention.

11 is a flowchart illustrating a DCI transmission method by a base station according to an embodiment of the present invention.

12 is a flowchart illustrating a DCI reception method by a terminal according to an embodiment of the present invention.

Hereinafter, some embodiments will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the embodiments of the present specification, when it is determined that a detailed description of a related well-known configuration or function may obscure the gist of the present specification, the detailed description thereof will be omitted.

In addition, in describing the component of this specification, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected or connected to that other component, but between components It will be understood that may be "connected", "coupled" or "connected".

In addition, the present specification describes a wireless communication network, the operation performed in the wireless communication network is performed in the process of controlling the network and transmitting data in the system (for example, the base station) that is in charge of the wireless communication network, or the corresponding wireless Work may be done at the terminal coupled to the network.

2 shows a wireless communication system to which the present invention is applied.

Referring to FIG. 2, the wireless communication system 10 is widely deployed to provide various communication services such as voice and packet data. The wireless communication system 10 includes at least one base station (BS) 11. Each base station 11 provides a communication service for a particular geographic area or frequency area (generally called a cell) 15a, 15b, 15c. The cell can in turn be divided into a number of regions (called sectors).

The mobile station (MS) 12 may be fixed or mobile, and may include a user equipment (UE), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, and a PDA. (personal digital assistant), wireless modem (wireless modem), a handheld device (handheld device) may be called other terms. The base station 11 generally refers to a fixed station communicating with the terminal 12, and includes an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and a femto eNB. ), Home eNB (HeNB), relay, etc. may be called other terms. The cell should be interpreted in a comprehensive sense of a part of the area covered by the base station 11 and encompasses various coverage areas such as megacells, macrocells, microcells, picocells and femtocells.

Hereinafter, downlink refers to a communication or communication path from the base station 11 to the terminal 12, and uplink refers to a communication or communication path from the terminal 12 to the base station 11. . In downlink, the transmitter may be part of the base station 11 and the receiver may be part of the terminal 12. In uplink, the transmitter may be part of the terminal 12 and the receiver may be part of the base station 11. There is no limitation on the multiple access scheme applied to the wireless communication system 10. Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier-FDMA (SC-FDMA), OFDM-FDMA, OFDM-TDMA For example, various multiple access schemes such as OFDM-CDMA may be used. The uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme transmitted using different times or a frequency division duplex (FDD) scheme transmitted using different frequencies.

3 shows a structure of a radio frame to which the present invention is applied.

Referring to FIG. 3, a radio frame includes 10 subframes, and one subframe includes two slots. The time taken for one subframe to be transmitted is called a transmission time interval (TTI). For example, one subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.

One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and includes a plurality of resource blocks (RBs) in the frequency domain. The OFDM symbol is used to represent one symbol period since 3GPP LTE uses OFDMA in downlink, and may be referred to as an SC-FDMA symbol or a symbol period according to a multiple access scheme. The RB includes a plurality of consecutive subcarriers in one slot in resource allocation units.

The structure of the radio frame is only an example, and the number of subframes included in the radio frame or the number of slots included in the subframe and the number of OFDM symbols included in the slot may be variously changed.

4 shows a structure of a downlink subframe to which the present invention is applied.

Referring to FIG. 4, the subframe includes two slots. The preceding two or three OFDM symbols of the first slot in the subframe are control regions to which a PDCCH (Physical Downlink Control Channel (PDCCH)) is allocated, and the remaining OFDM symbols are data regions to which a Physical Downlink Shared Channel (PDSCH) is allocated. do.

The downlink control channel includes a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid-ARQ indicator channel (PHICH), and the like. The PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols (ie, the size of the control region) used for transmission of control channels within the subframe. The PHICH carries an ACK (Acknowledgement) / NACK (Not-Acknowledgement) signal for an uplink HARQ (Hybrid Automatic Repeat Request). That is, the ACK / NACK signal for the uplink data transmitted by the terminal is transmitted on the PHICH.

Now, a PDCCH which is a downlink physical channel will be described.

PDCCH is a resource allocation and transmission format of downlink shared channel (DL-SCH), resource allocation information of uplink shared channel (UL-SCH), paging information on PCH, system information on DL-SCH, random access response transmitted on PDSCH Resource allocation of a higher layer control message, a set of transmit power control commands for individual UEs in a certain UE group, and activation of a Voice over Internet Protocol (VoIP). A plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs. The PDCCH is transmitted on an aggregation of one or several consecutive control channel elements (CCEs). CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to a state of a radio channel. The CCE corresponds to a plurality of resource element groups. The format of the PDCCH and the number of bits of the PDCCH are determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.

Control information transmitted through the PDCCH is referred to as downlink control information (DCI). DCI has different uses according to its format, and fields defined in DCI are also different. Table 1 shows DCI according to DCI format.

Table 1

DCI format	Explanation
0	Used for scheduling of PUSCH (Uplink Grant)
One	Used for scheduling one PDSCH codeword
1A	Used for simple scheduling of one PDSCH codeword and a random access procedure initiated by a PDCCH command
1B	Used for simple scheduling of one PDSCH codeword using precoding information
1C	Used for brief scheduling of one PDSCH codeword and notification of MCCH changes
1D	Used for simple scheduling of one PDSCH codeword containing precoding and power offset information
2	Used for PDSCH scheduling for UE configured in spatial multiplexing mode
2A	Used for PDSCH scheduling of UE configured in long delay CDD mode
3	Used to transmit TPC commands for PUCCH and PUSCH with power adjustment of 2 bits
3A	Used to transmit TPC commands for PUCCH and PUSCH with single bit power adjustment

DCI format 0 indicates uplink resource allocation information, DCI formats 1 to 2 indicate downlink resource allocation information, and DCI formats 3 and 3A indicate uplink transmit power control (TPC) commands for arbitrary UE groups. . Each field of the DCI is sequentially mapped to an information bit. For example, if DCI is mapped to information bits having a total length of 44 bits, the resource allocation field may be mapped to 10th to 23rd bits of the information bits.

DCI includes uplink resource allocation information and downlink resource allocation information. The uplink resource allocation information may be referred to as an uplink grant, and the downlink resource allocation information may be referred to as a downlink grant.

Table 2 shows DCI of format 0 which is uplink resource allocation information (or uplink grant).

TABLE 2

The flag is an indicator for distinguishing DCI 0 from DCI 1A as 1-bit information. The hopping flag is 1-bit information and indicates whether frequency hopping is applied or not when the terminal performs uplink transmission. For example, if the hopping flag is 1, frequency hopping is applied during uplink transmission, and if hopping flag is 0, frequency hopping is not applied during uplink transmission.

Resource block assignment and hopping resource allocation is also called a resource allocation field. The resource allocation field indicates the physical location or amount of resources allocated to the terminal. Although not shown in Table 2, the uplink grant includes a surplus bit or a padding bit to keep the total number of bits constant. There are various formats of DCI. Even if the control information of the different formats is used by using the surplus bits, the length of the bits can be adjusted to be the same, and thus the UE can smoothly perform blind decoding.

For example, in Table 2, if the resource allocation field is 13 bits in the FDD 20MHz band, the uplink grant is 27 bits (excluding the CIF field and the CRC field). If the length of the bit determined as the blind decoding input is 28 bits, the base station adds an extra bit of 1 bit to the uplink grant during scheduling so that the total number of bits of the uplink grant is 28 bits. At this time, since the surplus bits do not contain special information, all of them may be set to zero. Of course, the number of surplus bits may be less than two, or may be large.

Regarding resource allocation, the physical resource structure is described first.

5 is an exemplary diagram illustrating a resource grid for one downlink slot to which the present invention is applied.

Referring to FIG. 5, a downlink slot includes a plurality of OFDM symbols in a time domain. Here, one downlink slot includes 7 OFDMA symbols, and one resource block (RB) exemplarily includes 12 subcarriers in the frequency domain, but is not limited thereto.

Each element on the resource grid is called a resource element (RE), and one resource block includes 12 × 7 resource elements. The number N ^DL of resource blocks included in the downlink slot depends on the downlink transmission bandwidth set in the cell. The bandwidths considered in LTE are 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz, which are 6, 15, 25, 50, 75, and 100, respectively. At least one resource block corresponding to each band may be bundled to form a resource block group (RBG). For example, two adjacent resource blocks may constitute one resource block group.

In LTE, the total number of resource blocks for each bandwidth and the number of resource blocks constituting one resource block group are shown in Table 3.

TABLE 3

Bandwidth	Total number of resource blocks	The number of resource blocks belonging to one resource block group	Total number of resource block groups
1.4 MHz	6	One	6
3 MHz	15	2	8
5 MHz	25	2	13
10 MHz	50	3	17
15 MHz	75	4	19
20 MHz	100	4	25

Referring to Table 3, the total number of available resource blocks varies according to a given bandwidth. The difference in the total number of resource blocks means that the size of information indicating resource allocation is different. In addition, the number of cases in which resource blocks are allocated may vary depending on the resource allocation method. As an example of a resource allocation scheme, a resource block may be allocated using a bitmap format (type 0). As another example of the resource allocation scheme, resource blocks may be allocated at predetermined intervals or periods (type 1). As another example of a resource allocation scheme, resource blocks may be allocated as contiguous constant length regions (type 2). The resource block allocated to the terminal is indicated by the resource allocation field, and the bit request amount of the resource allocation field varies according to each type of resource allocation scheme and the total number of resource blocks for each bandwidth.

Hereinafter, each type of resource allocation scheme will be described. In the following description, a description of a resource block may be replaced with a resource block group.

6 is an example of a resource allocation method to which the present invention is applied. This is type 0 resource allocation.

Referring to FIG. 6, the type 0 resource allocation scheme is a scheme in which all resource blocks of the system are allocated to the UE in units of clusters grouped into at least one consecutive resource block. At least one resource block is spaced between clusters. This is also referred to as non-contiguous resource allocation. In FIG. 6, four clusters are allocated to the terminal. The first cluster includes one resource block, the second cluster includes three resource blocks, the third cluster includes two resource blocks, and the fourth cluster includes one resource block. In particular, resource allocation in which two clusters are allocated to one terminal is called a double cluster, and resource allocation in which three or more clusters are allocated is called unlimited non-contiguous resource allocation. Depending on how many clusters you allocate, your system's throughput will vary.

The allocation or unassignment of each resource block may be represented by a bitmap. Each bit is mapped to each resource block. For example, if the bit is 1, the corresponding resource block is allocated to the terminal. If the bit is 0, the corresponding resource block is not allocated to the terminal. For example, FIG. 6 illustrates a case where the bitmap is 010011100110100. In the case of indicating resource allocation for a terminal in a bitmap format as in type 0, the required amount of bits is required for the number of resource blocks. That is, the required amount of bits is when the number of resource blocks is n,

Becomes here,

Is the minimum integer greater than or equal to x.

7 is another example of a resource allocation method. This is a type 1 resource allocation method.

Referring to FIG. 7, resource blocks are allocated in a periodic form, and resource allocation may be expressed in a form having a period of P and distributed at regular intervals for all resource blocks. For example, FIG. 7 is a case where the period P = 2. The number of bits needed to represent type 1 resource allocation is

+

to be. here,

Is the size of the resource block subset with period P and 1 is the offset. This can represent resource allocation in specific cases. In general, when type 0 and type 1 are used together, a division bit for distinguishing type 0 and type 1 may be added.

8 is another example of a resource allocation method to which the present invention is applied. This is a type 2 resource allocation method.

Referring to FIG. 8, at least one adjacent resource block may be bundled and allocated. This is expressed as an offset from the start of all RBs and the number of adjacent RBs. For example, FIG. 8 is a case where the offset is 2 and the number of resource blocks is 10. FIG. Type 2 represents Contiguous Resource Allocation, whereas Type 0 and Type 1 represent Non-contiguous Resource Allocation. Therefore, when the number of resource blocks is large, the number of bits of the resource allocation field required to express the resource allocation of type 2 is smaller than that of type 0 or type 1. When n resource blocks are allocated by Type 2, the number of cases of all resource allocation is determined by Equation 1.

Equation 1

Therefore, the number of bits of the required resource allocation field is determined by equation (2).

Equation 2

The resource allocation field included in the uplink grant must be able to represent both continuous resource allocation and non-contiguous resource allocation. However, since the number of bits of the resource allocation field is limited to express the number of all cases according to the continuous resource allocation and the discontinuous resource allocation, the number of bits of the resource allocation field must be increased. Increasing the number of bits of the resource allocation field eventually results in a modification to the uplink grant structure, which may be inefficient because it imposes a burden on the blind decoding of the UE. Therefore, using the surplus bits included in the DCI but not used for resource allocation enables efficient use of limited resources while maintaining the structure of the conventional uplink grant.

Hereinafter, a resource allocation field that selectively indicates continuous resource allocation and non-contiguous resource allocation is called a hybrid resource allocation field. The mixed resource allocation field may indicate contiguous resource allocation or may indicate discontinuous resource allocation. Whether the mixed resource allocation field indicates contiguous resource allocation or nonconsecutive resource allocation can be distinguished by a surplus bit.

For example, suppose the surplus bit is one bit. If the surplus bit is 0, the mixed resource allocation field included in the uplink grant may indicate continuous resource allocation or discontinuous resource allocation. If the surplus bit is 1, the mixed resource allocation field may indicate discontinuous resource allocation. That is, whether one mixed resource allocation field indicates continuous or discontinuous resource allocation is determined by the surplus bits. For example, suppose the resource allocation field is 4 bits and its value is 0001. If the surplus bit is zero, the value 0001 of the mixed resource allocation field indicates one case of continuous or discontinuous resource allocation. On the contrary, if the surplus bit is 1, the value 0001 of the mixed resource allocation field indicates one case of non-contiguous resource allocation. In this way, even if the same resource allocation field value, the indication may vary depending on the surplus bits. This is, of course, merely an example and the redundancy bits may be reversed. However, for the sake of consistency of description, the following description assumes that if the surplus bit is 0, the mixed resource allocation field indicates continuous or discontinuous resource allocation, and when the surplus bit is 1, the mixed resource allocation field indicates nonconsecutive resource allocation. do.

On the other hand, even the same number of resource blocks may be different from the number of cases that are allocated consecutively and the number of cases that are allocated continuously. For example, when a number of cases where n resource blocks are allocated contiguously and a number of cases where the resource blocks are continuously allocated may be a> b. Fewer cases mean that fewer bits are needed. In the case of continuous resource allocation, since only two elements, offset and length, can be expressed, even a relatively small number of bits can represent all cases of continuous resource allocation. In contrast, relatively more bits are needed to represent the number of cases in all cases of non-contiguous resource allocation.

For example, assume that the base station allocates 100 resource blocks using a 13-bit mixed resource allocation field. 13 bits can represent a total of 2 ¹³ = 8192 cases (or code points).

First, consider the case where the surplus bit = 1 (that is, when the mixed resource allocation field indicates non-contiguous resource allocation). If 100 resource blocks are allocated as non-contiguous resource allocation, if there are 19000 cases, the 13-bit mixed resource allocation field can represent only 8192 cases, and the remaining 19000-8192 = 10808 cases. Can not express. Thus, additional resources are needed to further represent 10808 cases for non-contiguous resource allocation.

Next, consider the case where the surplus bit = 0 (i.e., when the mixed resource allocation field indicates continuous or discontinuous resource allocation). If 100 resource blocks are allocated in consecutive resource allocation, if there are 5050 cases, the mixed resource allocation field represents 5050 cases and 8191-5050 = 3141 cases (the last one code point indicates SPS). Can be used for more purposes).

For efficient use of resources, the remaining 3141 cases are used for non-contiguous resource allocations, except for the number of all cases of consecutive resource allocations that the mixed resource allocation field can indicate. For example, the range of 0 to 5049 of the values of the mixed resource allocation field corresponds to continuous resource allocation, and the range of 5050 to 8290 of the values of the mixed resource allocation field corresponds to non-contiguous resource allocation. If the bit is 0, the mixed resource allocation field may indicate continuous resource allocation or may indicate non-consecutive resource allocation according to the range of the value of the mixed resource allocation field.

For the additional 10808 cases needed for non-contiguous resource allocations, except for the remaining 3141 cases of the mixed resource allocation field, additional resources are needed to further represent the number of 7667 cases.

However, as described above, adding an additional information bit to the existing uplink grant is a modification of the existing structure, which is not preferable because of the burden of blind decoding of the terminal. Therefore, when information bits which are not used in a specific situation are used as bits in an uplink grant, it is possible to efficiently use limited radio resources while maintaining the structure of the uplink grant. In addition to the mixed resource allocation field, a hopping flag included in an uplink grant may be used to express non-contiguous resource allocation.

The principle is explained as follows. In discontinuous resource allocation, such as type 0 or type 1, frequency hopping may not be applied during uplink transmission. In this case, even if the hopping flag of the uplink grant indicates frequency hopping of uplink transmission, frequency hopping is not applied. For example, given non-contiguous resource allocation, the terminal performs uplink transmission without frequency hopping regardless of the indication of the hopping flag included in the uplink grant. That is, when discontinuous resource allocation, the hopping flag has no meaning, and occupies only one bit of space in the uplink grant. Thus, the hopping flag is substantially the same as the surplus bits.

Thus, the hopping flag can be used to represent non-contiguous resource allocation along with the mixed resource allocation field when the surplus bit is one. If the mixed resource allocation field is 13 bits, since the hopping flag is 1 bit, the mixed resource allocation field is effectively extended to a total of 14 bits. Therefore, the number of cases of non-contiguous resource allocation that can be expressed is doubled. In the above example, there are 2 ¹⁴ = 16384 cases in number due to the combination of the hopping flag and the mixed resource allocation field when the surplus bit is one. In addition, the number of 3141 cases remaining after expressing continuous resource allocation among mixed resource allocation field values when the surplus bit is 0 is extended to 3141 * 2 = 6282 by a 1-bit hopping flag. As a result, the number of cases where non-contiguous resource allocation can be expressed is extended to 16384 + 6282 = 22666.

As described above, when a field used as a first use is specially used, an information field used for another second use (expression of discontinuous resource allocation) is called an adaptive field. The hopping flag is an example of an adaptive field.

The hopping flag is used to indicate whether frequency hopping is applied in uplink transmission when the mixed resource allocation field indicates continuous resource allocation. When the mixed resource allocation field indicates discontinuous resource allocation, the hopping flag is used to extend the number of cases indicative of discontinuous resource allocation.

The above example is an example in which uplink resources are allocated in units of resource blocks. If the uplink resources are allocated in units of resource block groups, the number of non-consecutive resource allocations is further reduced. Accordingly, the number of all cases of non-consecutive resource allocation may be left as an indication range of limited resource allocation.

In each type of resource allocation scheme, a DCI format for transmitting new control information may be determined in various ways. As an example, the remaining information bits of the existing DCI format may be used for new control information or a new field may be added at all. As another example, a new DCI format for new control information can be introduced. However, adding a new field to the existing DCI format substantially changes the existing DCI format, which increases the complexity of blind decoding, which is the process of extracting the DCI format from the PDCCH.

Blind decoding defines a decoding start point in a region of a given PDCCH, decodes all possible DCI formats in a given transmission mode, and decodes a user from C-RNTI information masked in CRC. That's the way. As the number of DCI formats to be decoded increases, the complexity of blind decoding increases. In addition, different sizes of DCI formats mean that the number of DCI formats to be decoded increases. In order to reduce the blind decoding burden of the UE, it is necessary to maintain the existing DCI format, but to use an unused field or a conventional field.

When a mixed resource allocation field is mapped to _k information bits, a ₀ to a _k-1 , the mixed resource allocation field may indicate resource allocation in a total of 2 ^k cases. Here, the value of the mixed resource allocation field indicating each case is referred to as a resource indication value (hereinafter referred to as RIV) or code point. For example, when a mixed resource allocation field is mapped to 10 information bits, the entire range of resource indication values is an integer of 0 to 2 ¹⁰ -1. If the mixed resource allocation field is 0000000111, the resource indication value is 8.

The resource indication value is determined by the number of resource blocks and the resource allocation method. For example, when the base station allocates 100 resource blocks corresponding to a 20 MHz bandwidth to the terminal by Type 2, a total of ₁₀₁ C ₂ = 5050 cases are obtained by Equation 1 above. Therefore, the resource indication value may have any value from 0 to 5049, which is the first resource range. Here, the minimum number of bits of the mixed resource allocation field required to represent all of the 5050 cases is 13 bits according to Equation 2 above. However, since the maximum resource indication value indicated by 13 bits is 2 ¹³ = 8192, the entire range of resource indication values has a range of 0 to 8191 which is wider than the first indication range. The second indication range remaining in the entire range of resource indication values except for the first indication range is 5050 to 8191.

The equation for obtaining the size of the resource indication value belonging to the second indication range is shown in Equation 3.

Equation 3

Here, a is the number of bits of the resource allocation field, and n is the number of resource blocks corresponding to the given bandwidth. Also, K indicates a range of resource indication values that are additionally excluded from the second indication range. For example, if the resource indication value of 8191 is fixed to be used as the SPS, then K = 1.

The first indication range may be used as an uplink grant which is the original purpose, and the second indication range indicates that the DCI is related to transmission of an uplink signal for another use, for example, or semi-persistent scheduling (semi- It may be used for indicating that the information relates to persistent scheduling (SPS). According to this method, it is possible to substantially add a new field without changing the DCI format or adding information bits related to the DCI. For example, if the resource indication value is 5070, since it belongs to the second indication range, the UE may know that the corresponding DCI indicates transmission of an aperiodic sounding reference signal. As another example, if the resource indication value is 8191 (ie, 1111111111111), the UE may know that the corresponding DCI is for the SPS.

If the resource indication value corresponding to the second indication range is effectively utilized, the base station may form a DCI of a substantially identical format or a substantially new DCI by defining a mixed resource allocation field of the DCI as a new field. Alternatively, the DCI field may be maintained as it is, but only information indicating that the UE takes a specific action may be added. The terminal performs blind decoding on the DCI format. As a result of decoding, the UE determines whether the resource indication value is the first indication range or the second indication range, and if the resource indication value is within the first indication range, the UE can recognize that the resource indication value is the DCI in the same manner as the existing DCI format. If it is in the second indication range, it can be recognized that the DCI of the new format. As a result, the UE does not have a burden of blind decoding the DCI of the new format, and resource efficiency may be increased by using a resource indication value of a range not used in the resource allocation field to be transmitted anyway.

Now, a method of transmitting DCI using the resource indication value corresponding to the second indication range will be described.

For example, the resource indication value corresponding to the second indication range may indicate information other than resource allocation. For example, the resource indication value belonging to the first indication range indicates allocation of a resource block, but the resource indication value belonging to the second indication range indicates new information for transmitting an uplink signal of the terminal or a downlink signal for the terminal. Information may be indicated for transmission of the.

For example, if the resource indication value of the mixed resource allocation field in the DCI is the second indication range, the resource indication value is information about the DCI setting of an aperiodic sounding reference signal (hereinafter referred to as ASRS) (hereinafter referred to as ASRS configuration information). , Information about the transmission setting of the channel state information (Channel State Information CSI), information about the ACK / NACK transmission setting and the like. When the UE determines whether the resource indication value falls within the second indication range, the UE may recognize that the corresponding DCI includes information on the transmission setting of the ASRS configuration information or the channel state information or information on the ACK / NACK transmission configuration. . Alternatively, the base station may transmit information on the downlink signal, for example, a precoding matrix indicator (PMI), a rank indicator (RI), and resource allocation information using the second indication range.

The ASRS configuration information includes various fields necessary for the transmission of the ASRS as shown in Table 4.

Table 4

SRS Information Element	Number of bits	Nyon
SRS activation	One	Interpreting the DCI Format
Transmission bandwidth
	2	Four SRS Bandwidths per Operating Band
Frequency position	3 or 5	Bandwidth start position (applies 3 bits for bands less than 5 MHz)
Transmission comb	One	2 comb
SRS cyclic shift	3	8 cyclic shift
SRS Configuration Index I SRS	9	Configuration of Subframes Assigned for SRS Transmission
Duration
	0	One-shot transfer or same period
SRS Bandwidth Configuration	0	Already known by one-shot transmission or SIB
CRC (UE ID)		UE ID masked to CRC
Sum	35 or 37

Referring to Table 4, the SRS Activation field is 1 bit information and indicates whether the corresponding DCI is a format related to transmission of the ASRS. The frequency position field is a parameter that determines the start position of an uplink bandwidth with respect to the ASRS. The Transmission Comb field is a parameter that defines an UpPTS section belonging to a special subframe in the TDD system. The SRS Configuration Index field is a parameter that determines the position and offset of a subframe in which the ASRS is transmitted. The cyclic shift field is a parameter for generating a sequence for transmission of the ASRS. The amount of information in the new field is limited by the range that can be represented by the resource indication value of the second indication range.

As another example, the resource indication value corresponding to the second indication range keeps the field of the existing DCI format the same. However, the DCI may be triggered to trigger a specific action of the terminal. In this case, the specific action may be that the terminal transmits an uplink signal to the base station, for example, may be a non-periodic sounding reference signal, or the base station may transmit a downlink signal to the terminal. . Therefore, as a result of the determination by the terminal, if the resource indication value is any value within the second indication range, the terminal not only can obtain the resource information allocated to itself, but also transmit the aperiodic sounding reference signal to the base station. can do. However, if the fields of the existing DCI format are the same, the resource indication value of the second indication range should also indicate resource allocation information of the terminal.

In the case of allocating a bandwidth of 20 MHz by Type 2, the total range of resource indication values for allocating 100 resource blocks is 0 to 8191, which may represent 8192 cases. However, since the first indication range is 0 to 5049 and the number of 5050 cases in total, and the second indication range is 5050 to 8191 and the number of 3142 cases in total, the number of cases of the second indication range is 1st. It is less than the indicated range. That is, it is impossible to express all the numbers of resource allocation of the first indication range as the second indication range. Therefore, in order to express the resource allocation field as the second indication range, resource blocks are allocated in units of resource block groups. If the total number of resource blocks is n and the number of resource blocks constituting one resource block group is r, the number m of resource block groups may be expressed as in Equation (4).

Equation 4

Therefore, the number of cases that can be expressed when allocating to a resource block group is expressed by Equation 5.

Equation 5

For example, in 100 resource blocks having a bandwidth of 20 MHz in Table 3, when two resource blocks are allocated to one resource block group, a total of 50 resource block groups are allocated. Accordingly, according to Equation 5, the number of ₅₁ C ₂ = 1275 cases can be obtained, which is an amount that can be included in the second indication range.

As another example, the resource indication value corresponding to the second indication range may be used to express discontinuous resource allocation. For example, when the mixed resource allocation field when the surplus bit is 1 is insufficient to express all non-contiguous resource allocations, an additional hopping flag, which is an adaptive field, is additionally used. Nevertheless, the lacking part is used to express discontinuous resource allocation up to the second indication range of the mixed resource allocation field when the surplus bit is zero. In this case, the number of cases of expressing discontinuous resource allocation may be calculated as in Equation 6 below.

Equation 6

Here, v is an indication range representing the entire non-contiguous resource allocation, x is the number of bits of the non-contiguous resource allocation field, y is the number of bits of the adaptive field, and z is the second indication range of the continuous resource allocation field. . For example, if x = 13 and y = 1, then v = 2 ¹⁴ + 3141 * 2 ¹ = 22666. Examples of each element expressing discontinuous resource allocation are shown in Table 5 below.

Table 5

Allocation Method	Redundant bit (1 bit)	Hopping flag (1 bit)	Scope of indication of resource allocation	Total number of resource indicators
Continuous resource allocation	0	Hopping (0 or 1)	0-5049	5050
Non-continuous resource allocation	One	Include in Resource Allocation	0 ~ 16383	22666
	0	0	16384 ~ 16384 + 3141-1
	0	One	16384 + 3141 ~ 16384 + 3141 * 2-1

Referring to Table 5, the indication range by the combination of the resource allocation field, the adaptive field, and the redundant bits can express not only the continuous resource allocation but also the non-contiguous resource allocation state. Even if the {redundant bit, hopping flag} combination is {0, 0, or 1}, the resource allocation instruction range 0 ~ 5049 corresponds to continuous resource allocation, and 5050 ~ 8190 is doubled according to the hopping flag to discontinuous resource allocation. Corresponds. Therefore, even when the surplus bit is 0, the mixed resource allocation field may indicate continuous resource allocation or may indicate non-consecutive resource allocation according to the range of the value of the mixed resource allocation field.

The above example is an example in which the uplink resources are allocated in units of resource blocks. If the uplink resources are allocated in units of resource block groups, the uplink resources are discontinuous according to calculations such as Equations 4 and 5 above. The number of cases of resource allocation is further reduced. Accordingly, the number of all cases of non-consecutive resource allocation may be left as an indication range of limited resource allocation.

As another example, there is a multiple resource allocation method that simultaneously applies discontinuous resource allocation and continuous resource allocation. This is a method for reducing the number of cases in which resource allocation states are expressed, and continuous resource allocation is applied to resource blocks (or resource block groups) at which resource allocation starts or ends, and non-consecutive resource allocation is otherwise applied. That is, do not apply non-contiguous resource allocation that includes resource blocks (or resource block groups) of a portion of an index where resource allocation begins and resource blocks (or resource block groups) of a portion of the index where resource allocation ends. Instead, non-contiguous resource allocation is applied to resource blocks (or resource block groups) corresponding to the remaining indexes. For example, the 10% index at the beginning and the 10% index at the end apply contiguous resource allocation, and apply non-contiguous resource allocation only to the middle 80% index.

Considering the situation where it is difficult to satisfy the RF standard when non-consecutive resource allocation is made at both ends, and at both ends, the form of transmitting control signals is defined in the LTE standard. It fits well with the design aspect.

9 is a block diagram illustrating a DCI transmitter and a DCI receiver according to an embodiment of the present invention. The DCI transmitter may be part of the base station, and the DCI receiver may be part of the terminal.

Referring to FIG. 9, the DCI transmitting apparatus 900 includes a DCI configuring unit 910, a control channel configuring unit 920, and a control channel transmitting unit 930.

The DCI configuration unit 910 determines the DCI format and configures the DCI to include necessary fields. When the transmission of the uplink grant is required, the DCI configuration unit 910 determines the DCI format as 0, and when the transmission of the downlink grant is required, the DCI format is determined as 1A. According to the determined DCI format, the DCI configuration unit 910 configures the DCI to include necessary fields by adjusting the resource indication value to fall within the second indication range. Here, when the resource indication value is R, the range of R is 0 ≦ R ≦ X. X is the maximum resource indication value. The first indication range of the resource indication value is 0 ≦ R <C, and the second indication range is C ≦ R ≦ X.

The DCI configuration unit 910 adjusts the resource indication value to fall within the second indication range as follows. For example, since DCI of format 0 is an uplink grant, the DCI configuration unit 910 extracts a partial region of information bits related to DCI, and adds a conversion value C such that a resource indication value falls within a second indication range. Insert into the resource allocation field of the uplink grant. For example, since the conversion value C is the maximum value of the first indication range and is 5050 based on the 20 MHz bandwidth and the type 2 resource allocation method, the DCI configuration unit 910 adds 5050 to the resource indication value if the resource indication value is 1024. The indication value is adjusted to 6074, so as to fall within the second indication range.

The extracted partial region may be a partial contiguous region of the information bits related to the DCI or may be a form in which bits distributed throughout are combined. In addition, the resource indication value corresponding to the second indication range may be in the form of triggering a specific action of the DCI while maintaining the same field of the existing DCI format. The DCI configuration unit 910 configures the DCI so that the extracted partial region and the remaining region are equal to the size of the uplink grant.

The control channel configuration unit 920 configures a physical channel to which the DCI configured by the DCI configuration unit 910 is transmitted, that is, a PDCCH.

The control channel transmitter 930 transmits the DCI to the DCI receiver 1000 through the PDCCH.

The DCI receiver 1000 includes a DCI analyzer 1010, a control channel decoder 1020, a control channel receiver 1030, and a response signal transmitter 1040.

The control channel receiver 1030 receives the DCI from the DCI transmitter 900. The control channel decoding unit 1020 decodes the PDCCH carrying the DCI by a blind decoding method and extracts the DCI.

The DCI analyzing unit 1010 decomposes the mixed resource allocation field and the other fields in the extracted DCI, determines whether the resource indication value of the mixed resource allocation field is greater than or less than C, and extracts the result from the determination result. Confirm the format and field of the DCI. As an example. As a result of the determination, when the resource indication value is smaller than C, the DCI analyzer 1010 determines the format of the extracted DCI as a general DCI (ie, an uplink grant). In this case, the response signal transmitter 1040 transmits uplink data to the DCI transmitter 900 by using the resource indicated by the uplink grant.

As another example, when the resource indication value is greater than or equal to C as a result of the determination, the DCI analyzing unit 1010 determines the format of the extracted DCI as a new DCI. The field is interpreted according to the new DCI format in which the field is configured by subtracting C from the resource indication value. If the new DCI is for transmission of the ASRS, the DCI analyzer 1010 instructs the response signal transmitter 1040 to generate and transmit an ASRS according to the field of the new DCI.

When the second indication range is divided into several subranges, one or more new DCI formats may exist. Where C is a number of values representing the beginning of each subrange, that is, C ₁ (= C), C ₂ ,... Can be M values of C _M. Thus, when dividing the second indication range into several subranges, each C ₁ (= C), C ₂ ,... The length of the information bits for the new DCI format corresponding to C _M is reduced by the number of integers in each subrange.

10 is a flowchart illustrating a method of transmitting DCI according to an embodiment of the present invention.

Referring to FIG. 10, the base station adjusts the resource indication value of the second indication range to configure a field of DCI (S100). The base station adjusts the resource indication value of the second indication range to configure a field of the DCI is as follows. The base station extracts a partial region of the DCI and adjusts it to belong to the second indication range by adding an integer C value to the resource indication value. The base station inserts the adjusted resource indication value into the resource allocation area of the uplink grant and configures the DCI to be equal to the size of the uplink grant. The DCI may include the fields of Table 2 or Table 4.

The base station configures a control channel for transmitting the DCI (S110). Here, the control channel is a PDCCH. The base station transmits the DCI to the terminal through the PDCCH (S120).

The terminal receives the DCI by blind decoding, extracts a resource allocation field of the DCI, and determines a format of the DCI by using a resource indication value of the resource allocation field. If the DCI is a new DCI format, the UE processes the new DCI in a manner suitable for the new DCI format, performs a procedure required by the new DCI, and transmits a response signal to the base station (S130). For example, if the procedure required by the new DCI is transmission of an ASRS, the terminal transmits the ASRS to the base station.

11 is a flowchart illustrating a DCI transmission method by a base station according to an embodiment of the present invention.

Referring to FIG. 11, the base station sets a new DCI format (S200). The new DCI format relates to various configuration information related to transmission of uplink control information of a terminal. For example, it includes ASRS, CSI transmission setting information, transmission setting information of ACK / NACK information, and the like.

In order to configure the new DCI format, the base station decomposes the entire field of the existing DCI into a resource allocation field and the remaining fields (S210). The resource indication value of the resource allocation field is Y. The base station adds the conversion value C to the resource allocation field to obtain the converted resource indication value X, and then combines the resource allocation field according to the converted resource indication value X and the remaining fields again (S220). This is to configure a new DCI by converting an existing resource indication value. The base station configures a PDCCH for a new DCI according to the converted resource indication value (S230), and transmits the new DCI to the UE through the PDCCH (S240).

12 is a flowchart illustrating a DCI reception method by a terminal according to an embodiment of the present invention.

Referring to FIG. 12, the terminal receives a DCI by performing blind decoding on the PDCCH (S300). The terminal decomposes the entire field of the received DCI into a resource allocation field and the remaining fields (S310). The terminal compares the resource indication value X of the resource allocation field with the converted value C (S320). If the resource indication value X is greater than or equal to the conversion value C, the terminal obtains the converted resource indication value Y minus the conversion value C from the resource indication value X, and obtains the obtained resource indication value Y and the remaining fields. Combine again (S330). The terminal interprets the new DCI according to the obtained resource indication value Y in a new DCI format analysis method (S340).

In step S320, if the resource indication value X is smaller than the conversion value C, the terminal interprets the entire field according to the existing DCI format (S350).

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims (20)

1. In the method of transmitting downlink control information by a base station,

   Constructing downlink control information including a resource allocation field indicating a resource indication value of a specific range; And

   And transmitting the downlink control information to a terminal on a physical downlink control channel (PDCCH).

   The resource indication value of the specific range is characterized in that the downlink control information includes configuration information for transmission of the uplink signal, downlink control information transmission method.
2. The method of claim 1,

   The uplink signal is a sounding reference signal (SRS), which is a reference signal for measuring a state of an uplink channel, downlink control information transmission method.
3. The method of claim 2,

   And aperiodically receiving the sounding reference signal from the terminal.
4. The method of claim 1,

   The resource indication value of the specific range is characterized in that the resource block is allocated to the terminal by at least one of a contiguous resource allocation and a non-contiguous resource allocation, downlink control information transmission method .
5. The method of claim 1,

   The downlink control information further includes a surplus bit and a hopping flag, and the resource allocation field is combined with at least one of the surplus bit and the hopping flag to indicate discontinuous allocation of a resource block to the terminal. The downlink control information transmission method, characterized in that.
6. In the method for receiving downlink control information by a terminal,

   Receiving downlink control information including a resource allocation field indicating a resource indication value of a specific range from a base station on a PDCCH; And

   Interpreting a format of the downlink control information based on the resource indication value of the specific range; And

   And decoding the downlink control information according to the interpreted format.
7. The method of claim 6,

   The resource indication value of the specific range indicates that the downlink control information includes configuration information for transmission of an uplink signal.

   The uplink signal is a sounding reference signal, which is a reference signal for measuring a state of an uplink channel, receiving method of downlink control information.
8. The method of claim 7, wherein

   And transmitting the sounding reference signal to the base station based on the configuration information.
9. The method of claim 6,

   The resource indication value of the specific range is characterized in that the resource block is allocated to the terminal by at least one of continuous resource allocation and non-contiguous resource allocation, downlink control information receiving method.
10. The method of claim 6,

    The downlink control information further includes a surplus bit and a hopping flag, and the resource allocation field indicates non-contiguous allocation of a resource block to a terminal in combination with at least one of the surplus bit and the hopping flag. , Receiving downlink control information.
11. An apparatus for transmitting downlink control information,

    A downlink control information configuring unit for configuring downlink control information based on a resource indication value of a specific range represented by a resource allocation field;

    A control channel configuration unit constituting a PDCCH to transmit the downlink control information; And

    A control channel transmitter for transmitting the downlink control information to the terminal on the PDCCH,

    The downlink control information is a device for transmitting downlink control information including information indicating the transmission of the uplink signal by the terminal.
12. The method of claim 11,

    The uplink signal is a sounding reference signal, which is a reference signal for measuring a state of an uplink channel, apparatus for transmitting downlink control information.
13. The method of claim 11,

    The downlink control information configuring unit changes the format of the downlink control information by mapping the resource allocation field to a specific region of information bits related to the downlink control information and adjusting the selected specific range. Characterized in that, downlink control information transmission device.
14. The method of claim 11,

    The apparatus for transmitting downlink control information is characterized in that the resource indication value of the specific range is allocated to the terminal by at least one of contiguous resource allocation and non-contiguous resource allocation. .
15. The method of claim 11,

    The downlink control information configuration unit configures the downlink control information to further include a redundant bit and a hopping flag, and combines the resource allocation field with at least one of the redundant bit and the hopping flag to form a resource block for the terminal. An apparatus for transmitting downlink control information, characterized by indicating discontinuous allocation.
16. In the apparatus for receiving downlink control information,

    A control channel receiver for receiving downlink control information from the base station on the PDCCH;

    A control channel decoding unit for extracting the downlink control information by performing blind decoding on the control channel; And

    The resource allocation field is separated from a plurality of fields included in the downlink control information, the format of the downlink control information is determined using the resource indication value indicated by the resource allocation field, and the analysis is appropriate for the determined format. And a downlink control information analyzer for analyzing the downlink control information by a method.
17. The method of claim 16,

    The resource indication value of the specific range indicates that the downlink control information includes configuration information for transmission of an uplink signal.

    The uplink signal is a sounding reference signal, which is a reference signal for measuring a state of an uplink channel, apparatus for receiving downlink control information.
18. The method of claim 17,

    And a response signal transmitter for transmitting the sounding reference signal to the base station based on the configuration information.
19. The method of claim 16,

    The resource indication value of the specific range is characterized in that the resource block is allocated to the terminal by at least one of continuous resource allocation and non-contiguous resource allocation, the apparatus for receiving downlink control information.
20. The method of claim 16,

    The downlink control information further includes a surplus bit and a hopping flag, and the resource allocation field indicates non-contiguous allocation of a resource block to a terminal in combination with at least one of the surplus bit and the hopping flag. , Receiving device for downlink control information.

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