WO2013077683A1

WO2013077683A1 - Transceiving point, method for transmitting control information by transceiving point, terminal and method for receiving control information by terminal

Info

Publication number: WO2013077683A1
Application number: PCT/KR2012/010006
Authority: WO
Inventors: 김종남; 박경민; 윤성준
Original assignee: 주식회사 팬택
Priority date: 2011-11-25
Filing date: 2012-11-26
Publication date: 2013-05-30
Also published as: KR20130058565A

Abstract

The present invention relates to a wireless communication system in which a transceiving point transmits a downlink scheduling allocation or an uplink scheduling grant to a terminal.

Description

Sending / receiving point, control information transmission method of the transmission and reception point, the terminal, and control information reception method of the terminal

The present invention relates to a wireless communication system in which a transmission / reception point transmits a downlink scheduling assignment or an uplink scheduling grant to a terminal.

In a wireless communication system, one of the basic principles of a wireless connection is that shared channel transmission, that is, time-frequency resources can be dynamically shared between user terminals. To this end, the transmitting end may control allocation of uplink and downlink resources. Information about such resource allocation may be transmitted from a transmission / reception point to a terminal through a control channel, and the control channel is located in a predetermined control region separated from the data region in downlink time-frequency space.

In order to improve the performance of a wireless communication system, technologies such as multiple-input multiple-output (MIMO) and coordinated multi-point transmission / reception (CoMP) have been considered. More control information may be required to use this technique. However, the limited control region may be insufficient to include many control channels through which downlink scheduling assignments or uplink scheduling grants are transmitted.

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

One embodiment of the present invention, the configuration information transmission unit for transmitting the configuration information of the common control information including the configuration information of the Enhanced Physical Downlink Control CHannel (E-PDCCH) provided to the plurality of terminals; A common control information transmitter for transmitting the common control information through a control region; And a control information transmitter for transmitting control information including downlink scheduling assignment or uplink scheduling grant through the E-PDCCH of the data region.

Another embodiment of the present invention, the configuration information transmission step of transmitting the configuration information of the common control information including the configuration information of the Enhanced Physical Downlink Control CHannel (E-PDCCH) provided to the plurality of terminals; Transmitting common control information through the control area to transmit the common control information; And a control information transmission step of transmitting control information including downlink scheduling assignment or uplink scheduling grant through the E-PDCCH of the data region.

Another embodiment of the present invention, the configuration information receiving unit for receiving the configuration information of the common control information including the configuration information of the Enhanced Physical Downlink Control CHannel (E-PDCCH) provided to the plurality of terminals; A common control information receiver configured to receive the common control information through a control region; And a control information receiver configured to receive control information including downlink scheduling allocation or uplink scheduling grant through the E-PDCCH of the data region.

Another embodiment of the present invention, the configuration information receiving step of receiving the configuration information of the common control information including the configuration information of the Enhanced Physical Downlink Control CHannel (E-PDCCH) provided to the plurality of terminals; Receiving common control information through the control region to receive the common control information; And a control information receiving step of receiving control information including downlink scheduling assignment or uplink scheduling grant through the E-PDCCH of the data region.

According to the present invention described above, the control information can be efficiently transmitted to the terminal in the wireless communication system.

1 illustrates a communication system to which embodiments of the present invention are applied.

2 illustrates a structure of a transmission / reception point according to an embodiment.

3 shows a subframe in which downlink transmission is performed.

4 to 7 show an example of transmitting an E-PDCCH.

8 is a flowchart illustrating a method of transmitting control information according to an embodiment.

9 shows an example of transmitting a common control channel and an E-PDCCH.

FIG. 10 illustrates an example of configuration information of a common control channel transmitted in step S810 of FIG. 8.

11 illustrates an E-PDCCH detection method executed in a terminal.

12-14 show examples of the structure of information in the common control channel.

15 illustrates a structure of a transmission / reception point according to an embodiment.

16 illustrates a structure of a terminal according to an embodiment.

Hereinafter, some embodiments of the present invention 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 present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Communication systems are widely deployed to provide various communication services such as voice, packet data, and the like.

Referring to FIG. 1, a communication system includes a user equipment (UE) 10 and a transmission / reception point 20 for performing uplink and downlink communication with the terminal 10.

In the present specification, the terminal 10 or a user equipment (UE) is a comprehensive concept that means a user terminal in wireless communication. In addition to the UE in WCDMA, LTE, and HSPA, as well as a mobile station (MS) and a UT (GSM) in GSM, It should be interpreted as a concept that includes a user terminal, a subscriber station (SS), and a wireless device.

A transmission / reception point 20 or a cell generally refers to a station communicating with the terminal 10, and includes a base station, a Node-B, an evolved Node-B, and a base transceiver. It may be called other terms such as a System, an Access Point, a Relay Node, and the like.

In the present specification, a transmission / reception point 20 or a cell is to be interpreted in a comprehensive sense indicating a part of a region covered by a base station controller (BSC) in a CDMA, a NodeB of a WCDMA, and the like. Comprehensive means any type of device that can communicate with a single terminal, such as a head, relay node, a sector of a macro cell, a site, or a micro cell such as a femtocell or picocell. Used as a concept.

In the present specification, the terminal 10 and the transmission / reception point 20 are used in a generic sense as a transmission / reception subject used to implement the technology or technical idea described in the present specification and are not limited to the terms or words specifically referred to.

Although one terminal 10 and one transmission / reception point 20 are illustrated in FIG. 1, the present invention is not limited thereto. One transmission / reception point 20 may communicate with a plurality of terminals 10, and one terminal 10 may communicate with a plurality of transmission / reception points 20.

There is no limitation on a multiple access scheme applied to a communication system, and an embodiment of the present invention includes code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), and orthogonal frequency division multiple access (OFDMA). ), And can be applied to various multiple access schemes such as OFDM-FDMA, OFDM-TDMA, and OFDM-CDMA.

In addition, in the embodiment of the present invention, the uplink transmission and the downlink transmission are a time division duplex (TDD) scheme transmitted using different times, a frequency division duplex (FDD) scheme transmitted using different frequencies, and TDD. It is applicable to a hybrid duplexing scheme in which FDD is combined.

Specifically, embodiments of the present invention are applicable to asynchronous wireless communication that evolves into Long Term Evolution (LTE) and LTE-advanced through GSM, WCDMA, HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. Can be. The present invention should not be construed as being limited or limited to a specific wireless communication field, but should be interpreted as including all technical fields to which the spirit of the present invention can be applied.

Referring to FIG. 1, the terminal 10 and a transmission / reception point 20 may perform uplink and downlink wireless communication.

In wireless communication, one radio frame (radioframe) consists of 10 subframes, and one subframe consists of two slots. The radio frame has a length of 10 ms and the subframe has a length of 1.0 ms. In general, the basic unit of data transmission is a subframe unit, and downlink or uplink scheduling is performed on a subframe basis.

One slot includes seven symbols (in the case of a normal cyclic prefix) or six symbols (in the case of an extended cyclic prefix) in the time domain. In this case, the time-frequency domain defined by 12 subcarriers corresponding to 180 kHz in the frequency domain with one slot in the time domain may be referred to as a resource block (RB), but is not limited thereto.

The transmission / reception point 20 may perform downlink transmission to the terminal 10. The transmission / reception point 20 may transmit a physical downlink shared channel (PDSCH) as a downlink data channel for unicast transmission. In addition, the transmission / reception point 20 may be configured to transmit downlink control information such as scheduling required for reception of a PDSCH and transmission on an uplink data channel (for example, a physical uplink shared channel (PUSCH)). Indicator for distinguishing a physical downlink control channel (PDCCH) as a downlink control channel used for transmitting downlink control information (DCI) including grant information, a region of a PDSCH and a PDCCH Physical Control Format Indicator Channel (PCFICH) for transmitting the PHY, Physical HARQ Indicator Channel (PHICH) for transmitting the HARQ (Hybrid Automatic Repeat request) for uplink transmission The control channel can be transmitted. Hereinafter, the transmission and reception of signals through each channel will be described in the form of transmission and reception of the corresponding channel.

The terminal 10 may perform uplink transmission to the transmission / reception point 20. The terminal 10 may transmit a PUSCH as an uplink data channel. In addition, the terminal 10 requests resource allocation when transmitting data in HARQ acknowledgment (NACK) / negative ACK (NACK), channel status report, and uplink indicating whether the downlink transport block has been successfully received. A physical uplink control channel (PUCCH) as an uplink control channel used for transmitting uplink control information (UCI) including a scheduling request may be transmitted.

The transmission / reception point 20 includes a cell-specific reference signal (CRS), a MBSFN reference signal (Multicast / Broadcast over Single Frequency Network Reference Signal, MBSFN-RS), and a UE-specific reference signal (UE) in downlink. Specific Reference Signal (DM-RS), Positioning Reference Signal (PRS), and CSI Reference Signal (Channel Status Information Reference Signal, CSI-RS) may be transmitted.

The terminal 10 may transmit a demodulation reference signal (DM-RS) and a sounding reference signal (SRS) in uplink.

2 illustrates a structure of a transmission / reception point 20 according to an embodiment.

Referring to FIG. 2, the transmission / reception point 200 includes first to n-th scramblers 210-1,..., 210-n, and first to n-th modulators 220-1,. n, layer mapper 230, precoder 240, first to mth resource element mapper 250-1, ..., 250-m, first To m-th OFDM signal generators 260-1 to 260-m, and first to m-th transmit antennas 270-1 to 270-m. In FIG. 2, n is the number of codewords and m is the number of layers or antenna ports. In FIG. 2, n and m may be the same value or different values.

Data on a transport channel is composed of transport blocks, and each transport block corresponds to one codeword. One or two codewords are input to the first to nth scramblers 210-1, ..., 210-n. The first to n-th scramblers 210-1,..., 210-n perform scrambling by multiplying a codeword by a scrambling sequence of bits.

The first to nth modulators 220-1,..., 220-n modulate the scrambled bits into corresponding complex modulation symbols. The modulation schemes in the first to nth modulators 220-1, ..., 220-n are, for example, Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (16QAM), and 64 Quadrature Amplitude Modulation (64QAM) schemes. There may be 2 bits, 4 bits, and 6 bits per symbol, respectively.

The layer mapper 230 defines a layer of modulation symbols so that the precoder 240 can distribute antenna specific symbols to the paths of the respective antennas. The layer is defined as an information path input to the precoder 240. The information path before the precoder 240 may be referred to as a virtual antenna or layer.

The precoder 240 outputs an antenna specific symbol by processing the modulation symbol by a multiple input multiple output (MIMO) scheme according to the first to m th transmission antennas 270-1 to 270-m. The precoder 240 distributes the antenna specific symbol to the first to m th resource element mappers 250-1,..., 250-m of the path of the antenna.

The first to m th resource element mappers 250-1,..., 250-m assign an antenna specific symbol to an appropriate resource element and multiplex according to a user. The first to m th OFDM signal generators 260-1 to 260-m may generate an OFDM symbol by performing an inverse fast fourier transform (IFFT) on the antenna specific symbol. The OFDM symbol may be transmitted through the first to m th transmit antennas 270-1,..., 270-m.

3 shows a subframe in which downlink transmission is performed. In FIG. 3, the horizontal axis represents time (symbol) and the vertical axis represents frequency.

Referring to FIG. 3, in one subframe, initial one to three symbols may be set to the control region 310 in which control information is transmitted. The control region 310 may include a control channel such as PDCCH, PCFICH, PHICH, and the like. The remaining area in the subframe may be set as the data area 320. The data area 320 may include a data channel such as a PDSCH. Resource allocation information on frequency and time resources allocated to each terminal in the data area 320 may be transmitted through a PDCCH.

The DCI transmitted on the PDCCH includes downlink scheduling allocation including PDSCH resource designation, transmission format, HARQ information, and spatial multiplexing related control information, PUSCH resource designation, transmission format, uplink scheduling grant including HARQ information, and uplink. It may include a command for power control.

The DCI for downlink scheduling assignment has a field for PDSCH resource designation (resource block allocation), a field for modulation scheme and coding rate information, a field for information related to spatial multiplexing, and a Radio Network Temporary Identifier (RNTI) field. Can be.

A field for resource block allocation informs about a resource block for which the UE should receive a PDSCH. The size of this field may vary depending on the DCI format.

The fields for the modulation and coding scheme are used to convey information on the modulation scheme, coding rate, and transport block size to the terminal. The size of this field may be 5 bits.

Fields for the spatial multiplexing related information are precoding information to the terminal, the number of transport layers. Used to convey antenna port information, scrambling information, and the like. The size of this field may vary depending on the DCI format.

RNTI is P-RNTI (Paging RNTI), SI-RNTI (System Information RNTI), M-RNTI (MBMS RNTI), RA-RNTI (Random Access RNTI), C-RNTI (Cell RNTI), TC-RNTI (Temporary Cell) RNTI), SPS-C-RNTI (Semi-Persistent Scheduling RNTI), TPC-PUCCH-RNTI (Transmit Power Control PUCCH RNTI), and TPC-PUSCH-RNTI (Transmit Power Control PUSCH RNTI). The RNTI may be 16 bits.

Meanwhile, technologies such as multiple-input multiple-output (MIMO) and coordinated multi-point transmission / reception (CoMP) have been considered to improve the performance of a wireless communication system. When applying this technique, more control information may be required. Resources of the control region 310 may be insufficient to allocate a plurality of PDCCHs for transmitting control information. In order to solve the space problem of the insufficient control area 310, it is possible to consider using a part of the data area 320 for control information. A channel for control information transmitted through the data region 320 may be referred to as an enhanced physical downlink control channel (Enhanced PDCCH) or an extended physical downlink control channel (Extended PDCCH), hereinafter referred to as an E-PDCCH. .

4 shows an example of using an E-PDCCH.

4, an E-PDCCH search space 420 to which an E-PDCCH including resource allocation information and control information of the PDSCH 410 is allocated is set in the data region 320. Contiguous resource allocation is performed for the E-PDCCH search space 420. Information about the E-PDCCH search space 420 may be delivered to the terminal through higher layer signaling such as RRC (Radio Resource Control).

A plurality of E-PDCCHs may be located in the E-PDCCH search space 420. The UE demodulates the E-PDCCH allocated to itself through blind detection in the E-PDCCH search space 420, and uses the same to allocate resource allocation information and control information of the PDSCH 410 (or PUSCH). I can figure it out. In one example, blind detection may be performed assuming transmission that is not applied to a single modulation scheme (QPSK) or MIMO scheme, such as PDCCH.

5 shows another example of using E-PDCCH.

Referring to FIG. 5, an E-PDCCH search space 520 to which an E-PDCCH including resource allocation information and control information of the PDSCH 510 is allocated is set in the data region 320. Distributed resource allocation is performed for the E-PDCCH search space 520. Information about the E-PDCCH search space 520 may be delivered to the UE through higher layer signaling such as RRC (Radio Resource Control).

A plurality of E-PDCCHs may be located in the E-PDCCH search space 520. The UE demodulates the E-PDCCH allocated to the user through blind detection in the E-PDCCH search space 520 and uses the resource allocation information and control information of the PDSCH 510 (or PUSCH). I can figure it out. In one example, blind detection of the E-PDCCH may be performed assuming transmission such that a single modulation scheme (QPSK), MIMO scheme is not applied, such as PDCCH.

Alternatively, each of the distributed E-PDCCH search spaces 520 may be allocated to a specific terminal. In such a case, blind detection can be omitted.

6 shows another example of using E-PDCCH.

Referring to FIG. 6, the control area 310 is classified into a common search space 630 and a UE-specific search space 640. The common search space 630 carries common control information and is monitored by all terminals in the cell. The terminal specific search space 640 delivers control information specific to the terminal and is monitored by at least one terminal in the cell.

In the data area 320, an E-PDCCH search space 620 to which an E-PDCCH including resource allocation information and control information of the PDSCH 610 is allocated is set. Information about the E-PDCCH search space 620 and related control information is provided through the PDCCH 650 located in the common search space 630. In this case, the PDCCH 650 located in the common search space 630 is a PDCCH allocated to a plurality of terminals.

The UE demodulates the PDCCH 650 located in the common search space 630 to extract resource information to which the E-PDCCH search space 620 is allocated, and detects the resource information to itself through blind detection in the E-PDCCH search space 630. The assigned E-PDCCH can be demodulated and the resource allocation information and control information of the PDSCH 610 (or PUSCH) can be identified. In one example, blind detection of the E-PDCCH may be performed assuming transmission such that a single modulation scheme (QPSK), MIMO scheme is not applied, such as PDCCH.

7 shows another example of using E-PDCCH.

Referring to FIG. 7, the control area 310 is classified into a common search space 730 and a UE-specific search space 740. The common search space 730 carries common control information and is monitored by all terminals in the cell. The terminal specific search space 740 delivers control information specific to the terminal and is monitored by at least one terminal in the cell.

In the data area 320, E-PDCCHs 720-1 and 720-2 including resource allocation information and control information of the PDSCH 710 are set. Information on resources to which the E-PDCCHs 720-1 and 720-2 are allocated and related control information are provided by each of the PDCCHs 750-1 and 750-2 located in the UE-specific search space 740. In this case, the PDCCHs 750-1 and 750-2 located in the terminal specific search space 740 are PDCCHs allocated to the specific terminal.

The terminal demodulates PDCCHs 750-1 and 750-2 allocated to itself located in the UE-specific search space 740, and extracts resource information to which E-PDCCHs 720-1 and 720-2 are allocated. The E-PDCCHs 720-1 and 720-2 assigned to the user can be demodulated to grasp resource allocation information and control information of the PDSCH 710 (or PUSCH). In this case, blind detection of the E-PDCCH may be omitted.

In FIGS. 6 and 7, the common search space and the terminal specific search space are shown as being separated by time (symbol), but this is for convenience of description, and the common search space and the terminal specific search space are distributed in time-frequency space. They can be positioned and overlap each other.

In order to increase the transmission efficiency of the E-PDCCH, transmission using a MIMO technique or transmission using a high order modulation scheme may be considered. However, in the methods described above with reference to FIGS. 4 to 7, when the method for increasing the transmission efficiency of the E-PDCCH is applied, blind detection is performed when the UE does not previously recognize information on the transmission of the E-PDCCH. The number may increase. On the contrary, when the information on the transmission of the E-PDCCH is indicated through the PDCCH, the E-PDCCH information can be directly obtained without blind detection, thereby enabling efficient E-PDCCH transmission. However, this may increase the overhead of the PDCCH. .

Referring to FIG. 8, the transmission / reception point 20 may provide configuration information to receive common control information from the terminals 10 that should receive common control information indicating transmission information of the E-PDCCH. It transmits through higher layer signaling such as RRC (S810).

The above-described transmission information of the E-PDCCH may be a modulation order, a coding rate, an antenna port, a scrambling identity, a number of layers, or the like. The present invention is not limited to this example and may include all information necessary for detecting the E-PDCCH.

Subsequently, the transmission / reception point 20 transmits PDSCH, PDSCH (or PUSCH) transmission information to the terminal 10 through the E-PDCCH, and common control information including transmission information of the E-PDCCH through the PDCCH. Transmit (S820).

Referring to FIG. 9, the PDSCH 910 may be transmitted through the data region 320. The E-PDCCHs 920-1 through 920-n may be transmitted through an E-PDCCH search space of the data region 310 in which one or more E-PDCCHs may exist. The control region 310 may be divided into a common search space 930 and a terminal specific search space 940, and the PDCCH 950 may be transmitted through the common search space 930 of the control region 310. The PDCCH 950 may include transmission information 960-1 to 960-n of a plurality of E-PDCCHs allocated to a plurality of terminals, and may be commonly used by the plurality of terminals.

Referring back to FIG. 8, the terminal 10 blindly detects the PDCCH in the control region and extracts transmission information of the E-PDCCH allocated thereto (S830). Configuration information necessary for blind detection of the PDCCH is information transmitted in step S810 described above.

The terminal 10 blindly detects the E-PDCCH in the E-PDCCH search space and extracts information on the PDSCH or the PUSCH allocated to the UE 10 (S840). Configuration information necessary for blind detection of the E-PDCCH may be information extracted in step S830 described above.

On the other hand, when the configuration information of the common control information is not received in step S810 or when blind detection of the PDCCH fails in step S830, the terminal 10 blinds the E-PDCCH using a preset default value. Can be detected.

Hereinafter, the configuration information of the common control information transmitted in the above-described step S810 will be described in more detail.

FIG. 10 illustrates an example of configuration information of common control information transmitted in step S810 of FIG. 8.

In FIG. 10, configuration information of common control information is called Enhanced Transmission Information (ETI) configuration information, but the present invention is not limited to this name and may be called various names.

In FIG. 10, the ETI configuration information includes an ETI-RNTI and an ETI-index.

The ETI-RNTI refers to an RNTI scrambled to a cyclic redundancy check (CRC) of common control information (PDCCH transmitted through a common search space) that carries transmission information of the E-PDCCH. Among the 16-bit RNTI, FFF4-FFFC is an unused value, and the ETI-RNTI may have one value within this range. Alternatively, the ETI-RNTI may include other RNTIs (P-RNTI, SI-RNTI, M-RNTI, RA-RNTI, C-RNTI, TC-RNTI, SPS-C-RNTI, TPC-PUCCH-RNTI, and TPC-PUSCH- RNTI, etc.) may have one of the previously set values.

Meanwhile, the ETI-RNTI may be a value set in advance in the system, and in this case, the ETI-RNTI may be excluded from higher layer signaling such as RRC.

The ETI-index indicates the position of the indication information of the terminal receiving the configuration information in the common control information carrying the transmission information of the E-PDCCH. That is, the common control information includes E-PDCCH transmission information for a plurality of terminals, and the ETI-index informs the position of information corresponding to a specific terminal among the plurality of E-PDCCH transmission information transmitted through the common control information. For example, the common control information may include M pieces of E-PDCCH transmission information, and the value of the ETI-index for a specific UE may be one of 1 to M.

In FIG. 10, the downlink transmission format of the common control channel is represented by DCI formats 3B, 3C, and 3D. However, the present invention is not limited to these names, and other names such as DCI format 5 may be used. have.

Hereinafter, the E-PDCCH detection method executed in the above-described steps S830 and S840 will be described in more detail.

11 illustrates an E-PDCCH detection method executed in a terminal.

Referring to FIG. 11, the terminal determines whether ETI configuration information is received through higher layer signaling such as RRC (S1110). The ETI configuration information may include ETI-RNTI and ETI-index information.

When the ETI configuration information is received through higher layer signaling such as RRC (YES in step S1110), the UE determines whether common control information is detected based on the ETI configuration information (S1120). In more detail, the UE demodulates the PDCCH transmitted through the common search space and determines whether the RNTI of the demodulated PDCCH matches the ETI-RNTI in the ETI configuration information.

If common control information is detected (YES in step S1120), the UE demodulates the E-PDCCH using configuration information of the E-PDCCH transmitted through the common control information (S1130). The common control information includes configuration information of the E-PDCCH for the plurality of terminals, and the terminal extracts configuration information of the E-PDCCH allocated to itself using the ETI-index. The terminal demodulates the E-PDCCH using the extracted configuration information of the E-PDCCH.

If the ETI configuration information is not received through higher layer signaling such as RRC (NO in step S1110) or if common control information is not detected (NO in step S1120), the UE demodulates the E-PDCCH using a default value ( S1140). For example, the default value may be the same value used for demodulation of the PDCCH. That is, assuming that the modulation scheme is QPSK, the coding rate is 1/3, and the MIMO technique is not used, the E-PDCCH may be blindly detected.

Hereinafter, configuration information of the E-PDCCH delivered through common control information will be described.

12 is an exemplary diagram for explaining a structure of common control information.

Referring to FIG. 12, the common control information 1200 includes an information field 1210 including configuration information of E-PDCCHs for a plurality of terminals. In the information field 1210, configuration information 1220-1 to 1220-n of the E-PDCCH for each terminal may be disposed in series. The location of the configuration information 1220-1 to 1220-n of the E-PDCCH for each terminal in the information field 1210 may be designated by the above-described ETI-index. In addition, the common control information 1200 includes an RNTI field 1230 for identifying a channel. The ETI-RNTI described above may be located in the RNTI field 1230.

In one embodiment, the configuration information of the E-PDCCH may be a modulation scheme and / or a coding rate.

For example, configuration information of the E-PDCCH for each terminal may indicate a modulation scheme used for the E-PDCCH. For example, the configuration information of the E-PDCCH is 1 bit, and when the value of 1 bit is 0, QPSK may be indicated, and when 1, 16QAM may be indicated. The common control information may indicate M modulation scheme information. The DCI format of the common control information may include the following content.

ETI command number 1, ETI command number 2,... , ETI command number M

Here, M = L _format0 and L _format0 may be equal to the payload size of DCI format 0 before the CRC is added. In this case, the payload size of DCI format 0 may mean the size of the payload including the padding bits. Of course, when the configuration information of the E-PDCCH is 1 bit, the corresponding 1 bit may be used to indicate a coding rate instead of a modulation scheme.

For another example, configuration information of the E-PDCCH for each terminal may indicate a modulation scheme and a coding rate (MCS). For example, configuration information of the E-PDCCH is 2 bits, and a modulation scheme and a coding rate may be configured as shown in Table 1 below. It will be apparent to those skilled in the art that modulation schemes and coding rates other than Table 1 may be applied.

TABLE 1

The common control channel may indicate M modulation and coding scheme (MCS) information. The DCI format of the common control channel may include the following content.

ETI command number 1, ETI command number 2,... , ETI command number M

From here,

L _format0 may be equal to the payload size of DCI format 0 before the CRC is added. In this case, the payload size of DCI format 0 may mean the size of the payload including the padding bits.

In this case, the common control channel may add a value of 1 bit to make the payload size equal to the payload size of DCI format 0.

For another example, configuration information of the E-PDCCH for each terminal may be 1 bit indicating a modulation scheme and a coding rate. For example, when the value of 1 bit is 0, the modulation scheme may be QPSK, the coding rate is 1/3, and when the value of 1 bit is 1, the modulation scheme may be 16QAM and the coding rate may be 1/2.

In another embodiment, the configuration information of the E-PDCCH may be antenna port, scrambling identifier, and / or number information of layers.

For example, the configuration information of the E-PDCCH for each terminal may be configured as shown in Table 2 below.

TABLE 2

In Table 2, the maximum number of layers in a single user MIMO (SU-MIMO) is 4, the maximum number of layers per terminal in a multi-user MIMO (MU-MIMO) is 4, and the maximum total number of layers in a MU-MIMO is 4, MU- The maximum number of MIMO supported terminals is 4 (the number of terminals having full orthogonality is 2).

The common control channel may indicate the number of M layers, antenna ports, and scrambling identifier (n _SCID ) information. The DCI format of the common control channel may include the following content.

ETI command number 1, ETI command number 2,... , ETI command number M

From here,

When is the common control channel

The zero value of the bit can be added to make the payload size equal to the payload size of DCI format 0.

For another example, various combinations of table configurations may be possible according to the maximum number of layers and the MU-MIMO condition in SU-MIMO. Examples may be as shown in Tables 3-1 to 3-6 below. In this case, the number of codewords is assumed to be 1.

Table 3-1

In the example of Table 3-1, the maximum number of layers in SU-MIMO is 1, the maximum number of layers per terminal in MU-MIMO is 1, the total number of layers in MU-MIMO is 4, and the maximum number of terminals in MU-MIMO is 4 (The number of terminals with full orthogonality is 4).

Table 3-2

In the example of Table 3-2, the maximum number of layers in UE-MIMO is 1, the maximum number of layers per terminal in MU-MIMO is 1, the total number of layers in MU-MIMO is 4, and the maximum number of terminals in MU-MIMO is 4 (The number of terminals with full orthogonality is 4).

Table 3-3

In the example of Table 3-3, the maximum number of layers in SU-MIMO is 1, the maximum number of layers per terminal in MU-MIMO is 1, the total number of layers is 4 in MU-MIMO, and the maximum number of terminals in MU-MIMO is 4 (The number of terminals with full orthogonality is 2).

Table 3-4

In the example of Table 3-4, the maximum number of layers in SU-MIMO is 2, the maximum number of layers per terminal in MU-MIMO, the total number of layers in MU-MIMO is 4, and the maximum number of terminals in MU-MIMO is 2 Or 3 (the number of terminals with full orthogonality is 2 or 3).

Table 3-5

In the example of Table 3-5, the maximum number of layers in SU-MIMO is 2, the maximum number of layers per terminal in MU-MIMO, the total number of layers in MU-MIMO is 4, and the maximum number of terminals in MU-MIMO is 2 Or 3 (the number of terminals with full orthogonality is 2 or 3).

Table 3-6

In the example of Table 3-6, up to 4 layers (excluding 3) in SU-MIMO, up to 1 layer per terminal in MU-MIMO, up to 2 total layers in MU-MIMO, and MU-MIMO support The maximum number of terminals is 2 (the number of terminals having complete orthogonality is 2).

Tables 3-1 to 3-6 described above are merely examples, and various combinations of table configurations are possible.

In Tables 3-1 to 3-6, two bits are required to indicate the antenna port, the scrambling identifier, and the layer number information of each E-PDCCH. The DCI format of the common control channel may include the following content.

ETI command number 1, ETI command number 2,... , ETI command number M

From here,

For another example, as shown in FIG. 13, the common control channel 1300 has an information field 1310 including E-PDCCH configuration information for a plurality of terminals, and configuration information of the E-PDCCH for each terminal. 1320-1 to 1320-n may include a first bit 1330 indicating the number of codewords and the remaining bits 1340 indicating an antenna port, the number of layers, scrambling information, and the like. In FIG. 13, a field for RNTI is omitted. In this case, various combinations of table configurations are possible as shown in Tables 4-1 to 4-6 below.

Table 4-1

In the example of Table 4-1, when there is one codeword, the maximum number of layers in SU-MIMO is 1, the maximum number of layers per terminal in MU-MIMO is 1, the total number of layers in MU-MIMO is 4, and the MU- The maximum number of MIMO supported terminals is 4 (the number of terminals having full orthogonality is 2). When there are two codewords, the maximum number of layers in SU-MIMO is 4, the maximum number of layers per terminal in MU-MIMO, the total number of layers in MU-MIMO is 4, and the maximum number of terminals in MU-MIMO is 2 (complete The number of terminals having orthogonality is 0).

Table 4-2

In the example of Table 4-2, when there is one codeword, the maximum number of layers in SU-MIMO is 1, the maximum number of layers per terminal in MU-MIMO is 1, the total number of layers in MU-MIMO is 4, and the MU- The maximum number of MIMO supported terminals is 4 (the number of terminals having complete orthogonality is 4). When there are two codewords, the maximum number of layers in SU-MIMO is 4, the maximum number of layers per terminal in MU-MIMO, the total number of layers in MU-MIMO is 4, and the maximum number of terminals in MU-MIMO is 2 (complete The number of terminals having orthogonality is 2).

Table 4-3

In the example of Table 4-3, when there is one codeword, the maximum number of layers in SU-MIMO is 1, the maximum number of layers per terminal in MU-MIMO is 1, the total number of layers in MU-MIMO is 4, and the MU- The maximum number of MIMO supported terminals is 4 (the number of terminals having complete orthogonality is 4). When there are two codewords, the maximum number of layers in SU-MIMO is 4, the maximum number of layers per terminal in MU-MIMO, the total number of layers in MU-MIMO is 4, and the maximum number of terminals in MU-MIMO is 2 (complete The number of terminals having orthogonality is 2).

Table 4-4

In the example of Table 4-4, when there is one codeword, the maximum number of layers in SU-MIMO is 1, the maximum number of layers per terminal in MU-MIMO is 1, the total number of layers in MU-MIMO is 4, and the MU- The maximum number of MIMO supported terminals is 4 (the number of terminals having full orthogonality is 2). When there are two codewords, the maximum number of layers in SU-MIMO is 4, the maximum number of layers per terminal in MU-MIMO, the total number of layers in MU-MIMO is 6 or 8, and the maximum number of terminals in MU-MIMO is 2 Or 3 (the number of terminals with full orthogonality is 2).

Table 4-5

In the example of Table 4-5, when there is one codeword, the maximum number of layers in SU-MIMO is 1, the maximum number of layers per terminal in MU-MIMO is 1, the total number of layers in MU-MIMO is 4, and the MU- The maximum number of MIMO supported terminals is 4 (the number of terminals having complete orthogonality is 4). When there are two codewords, the maximum number of layers in SU-MIMO is 4, the maximum number of layers per terminal in MU-MIMO, the total number of layers in MU-MIMO is 8, and the maximum number of terminals in MU-MIMO is 2 or 3 (The number of terminals with full orthogonality is 2 or 3).

Table 4-6

In Tables 4-1 to 4-6, one bit of each E-PDCCH configuration information indicates a number of codewords, and two bits indicate a combination of a number of layers, an antenna port, and / or a scrambling identifier. However, the information indicating the combination of the number of layers, the antenna port, and / or the scrambling identifier is not limited to 2 bits but may have a different bit size. Alternatively, each E-PDCCH configuration information may have a combination of the number of codewords, the number of layers, an antenna port, and / or a scrambling identifier.

In another embodiment, the common control information may indicate a modulation scheme, a coding rate, an antenna port, a scrambling identifier, and / or information about the number of layers of each E-PDCCH.

For example, as shown in FIG. 14, the common control information 1400 has an information field 1410 including E-PDCCH configuration information for a plurality of terminals, and configuration information 1420-1 to E-PDCCH. 1420-n may include a first field 1430 including modulation scheme and / or coding rate information, and a second field 1440 including antenna port, scrambling identifier, and / or number of layers. . In the example of FIG. 13, the E-PDCCH configuration information 1420-1 to 1420-n includes a 1-bit first field 1430, an antenna port, and a scrambling identifier indicating a modulation scheme (eg, QPSK / 16QAM). In addition, the second field 1440 includes three bits indicating the number of layers (for example, see Table 2), and thus a total of four bits may be required. In FIG. 14, a field for RNTI is omitted.

The DCI format of the common control information may include the following content.

ETI command number 1, ETI command number 2,... , ETI command number M

From here,

When is common control information

Although the above-described example has described 4-bit E-PDCCH configuration information composed of 1 bit indicating a modulation scheme, an antenna port, a scrambling identifier, and 3 bits indicating the number of layers, the present invention is not limited thereto. Alternatively, various types of E-PDCCH configuration information having various sizes including a field indicating a coding rate, an antenna port, a scrambling identifier, and / or a field indicating a number of layers may be used. In addition, the E-PDCCH configuration information may not include a plurality of fields distinguished from each other, but may be configured as one field indicating a combination of a modulation scheme, a coding rate, an antenna port, a scrambling identifier, and the number of layers.

A new DCI format may be allocated to common control information having the above configuration. For example, DCI providing modulation scheme and / or coding rate information of E-PDCCH for a plurality of UEs is called DCI format 3B, and DCI providing antenna port, scrambling identifier and / or layer number information is DCI format. Called 3C, a DCI that provides modulation scheme, coding rate, antenna port, scrambling identifier, and / or layer number information may be referred to as DCI format 3D. DCI formats 3B, 3C, and 3D are just examples and there is no limitation on the names of DCI formats (eg, may be called DCI formats 5, 5A, and 5B).

Referring to FIG. 15, the transmission / reception point 1500 may include a configuration information transmitter 1510 for transmitting configuration information of common control information, a common control information transmitter 1520 for transmitting common control information, and an E-PDCCH. E-PDCCH transmitter 1530 for transmitting the control information.

The configuration information transmitting unit 1510 may use an ETI-RNTI used as an identifier for blind detection of common control information in a control channel (eg, PDCCH), and an E-for multiple terminals transmitted through the common control information. ETI-index used to indicate information allocated to a specific UE among PDCCH configuration information is transmitted. The ETI-RNTI is information provided in common to a plurality of terminals using common control information, and the ETI-index is information provided to each terminal using common control information. The configuration information transmitter 1410 may deliver configuration information of common control information including ETI-RNTI and ETI-index to the terminal through higher layer signaling such as RRC.

The common control information transmitter 1520 transmits common control information for a plurality of terminals.

The common control information may be transmitted through a common search space in the control region in time-frequency resources.

The common control information may include a field for E-PDCCH configuration information and a RNTI field for a plurality of terminals. The E-PDCCH configuration information may inform a plurality of UEs of information about a modulation scheme, a coding rate, an antenna port, a scrambling identifier, and the number of layers of the E-PDCCH. The E-PDCCH configuration information may be in the form of serially connected configuration information of the E-PDCCH for each terminal, the location of the configuration information of the E-PDCCH for each terminal is the ETI transmitted by the configuration information transmitter 1510 Can be set by -index. The RNTI may be an ETI-RNTI transmitted by the configuration information transmitter 1510.

The E-PDCCH transmitter 1530 transmits control information for a specific UE through the E-PDCCH.

The E-PDCCH may be transmitted through the data region in time-frequency resources.

The E-PDCCH may carry configuration information of a PDSCH or a PUSCH. That is, the E-PDCCH may include downlink scheduling including PDSCH resource designation, transmission format, HARQ information, and spatial multiplexing related control information. Alternatively, the E-PDCCH may include an uplink scheduling grant including PUSCH resource designation, transmission format, and HARQ information.

At least some of the configuration information (modulation scheme, coding rate, antenna port, scrambling identifier, number of layers, etc.) of the E-PDCCH may be transmitted through joint control information. When the configuration information of the joint control information is not transmitted, the joint control information is not transmitted, or when the joint control information transmits only a part of the E-PDCCH configuration information, the E-PDCCH configuration information that is not delivered to the terminal is previously determined. The default set can be used.

16 illustrates a structure of a terminal according to an embodiment.

Referring to FIG. 16, the terminal 1600 may include a configuration information receiver 1610 that receives configuration information of common control information, a common control information receiver that receives common control information and extracts E-PDCCH configuration information from the common control information ( 1620, an E-PDCCH receiver 1630 that receives the E-PDCCH and extracts configuration information of a PDSCH or a PUSCH from the E-PDCCH.

The configuration information receiving unit 1610 may include an ETI-RNTI used as an identifier for blind detection of common control information in a control channel (eg, PDCCH), and an E-PDCCH for a plurality of terminals transmitted through the common control channel. Receives an ETI-index used to indicate information allocated to itself among configuration information. The ETI-RNTI is information provided in common to a plurality of terminals using common control information, and the ETI-index is information provided to each terminal using common control information. The configuration information receiver 1510 may receive configuration information of common control information including ETI-RNTI and ETI-index through higher layer signaling such as RRC.

The common control information receiver 1620 receives common control information for a plurality of terminals.

The common control information may include a field for E-PDCCH configuration information and a RNTI field for a plurality of terminals. The E-PDCCH configuration information may inform a plurality of UEs of information about a modulation scheme, a coding rate, an antenna port, a scrambling identifier, and the number of layers of the E-PDCCH. The E-PDCCH configuration information may be in a format in which configuration information of the E-PDCCH for each terminal is connected in series, and the location of the configuration information of the E-PDCCH for each terminal is determined by the ETI- received by the configuration information receiver 1610. Can be set by index. The RNTI may be an ETI-RNTI received by the configuration information receiver 1610.

The common control information receiver 1620 performs blind decoding on all PDCCHs received through the control region, and determines that the RNTI matches the ETI-RNTI received through the configuration information receiver 1610 as common control information. The E-PDCCH configuration information allocated to itself is extracted from the E-PDCCH configuration information for the plurality of terminals transmitted through the common control information using the ETI-index received through the receiver 1610.

The E-PDCCH receiver 1630 receives the E-PDCCH for the terminal 1600.

At least some of the configuration information (modulation scheme, coding rate, antenna port, scrambling identifier, number of layers, etc.) of the E-PDCCH may be received through joint control information. When the configuration information of the joint control information is not received, the joint control information is not received, or when the joint control information transmits only a part of the E-PDCCH configuration information, the E-PDCCH configuration information that is not delivered to the terminal is previously determined. The default set can be used.

The E-PDCCH receiver 1630 decodes the E-PDCCH allocated to the terminal 1600 by using the E-PDCCH configuration information (or a preset default value) extracted by the common control information receiver 1620. If the resources of the E-PDCCH search space in which the E-PDCCHs for the plurality of UEs can be located in the data area are set, and the E-PDCCH for the UE 1600 is located in the E-PDCCH search space, the E-PDCCH receiver The 1630 may decode the E-PDCCH assigned to the user through blind detection. If resources of the E-PDCCH for only the terminal 1600 are set in the data area, blind detection may not be performed.

The information extracted from the E-PDCCH may be used for uplink scheduling assignment or downlink scheduling grant.

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 thereto. 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.

CROSS-REFERENCE TO RELATED APPLICATION

This patent application claims priority under No. 119 (a) (35 USC § 119 (a)) of the Patent Application No. 10-2011-0124640, filed with Korea on November 25, 2011. All content is incorporated by reference in this patent application. In addition, if this patent application claims priority for the same reason for countries other than the United States, all its contents are incorporated into this patent application by reference.

Claims

A configuration information transmitter configured to transmit configuration information of common control information including configuration information of an Enhanced Physical Downlink Control CHannel (E-PDCCH) provided to a plurality of terminals;

A common control information transmitter for transmitting the common control information through a control region; And

And a control information transmitter for transmitting control information including downlink scheduling assignment or uplink scheduling grant through the E-PDCCH of the data region.
The method of claim 1,

The configuration information of the common control information includes the identifier of the common control information and location information on the configuration information of the configuration information of the E-PDCCH provided to a specific terminal in the common control information.
The method of claim 1,

Configuration information of the common control information transmission and reception point, characterized in that transmitted through RRC (Radio Resource Control).
The method of claim 1,

The configuration information of the E-PDCCH includes at least one of a modulation scheme, an encoding rate, an antenna port, a scrambling identifier, a number of layers, and a number of codewords for the E-PDCCH.
A configuration information transmitting step of transmitting configuration information of common control information including configuration information of an Enhanced Physical Downlink Control CHannel (E-PDCCH) provided to a plurality of terminals;

Transmitting common control information through the control area to transmit the common control information; And

And transmitting control information for transmitting control information including downlink scheduling assignment or uplink scheduling acknowledgment through the E-PDCCH of the data region.
The method of claim 5,

The configuration information of the common control information includes the identifier of the common control information and location information on the configuration information of the configuration information of the E-PDCCH provided to a specific terminal in the common control information. .
The method of claim 5,

The configuration information of the common control information is a control information transmission method of a transmission and reception point, characterized in that transmitted through RRC (Radio Resource Control).
The method of claim 5,

The configuration information of the E-PDCCH includes at least one of a modulation scheme, an encoding rate, an antenna port, a scrambling identifier, a number of layers, and a number of codewords for the E-PDCCH. Transmission method.
A configuration information receiver configured to receive configuration information of common control information including configuration information of an Enhanced Physical Downlink Control CHannel (E-PDCCH) provided to a plurality of terminals;

A common control information receiver configured to receive the common control information through a control region; And

And a control information receiver configured to receive control information including downlink scheduling assignment or uplink scheduling grant through the E-PDCCH of the data region.
The method of claim 9,

And the configuration information of the common control information includes an identifier of the common control information and location information on configuration information of an E-PDCCH provided to a specific terminal in the common control information.
The method of claim 9,

The configuration information of the common control information terminal, characterized in that received through RRC (Radio Resource Control).
The method of claim 9,

The configuration information of the E-PDCCH includes at least one of a modulation scheme, a coding rate, an antenna port, a scrambling identifier, a number of layers, and a number of codewords for the E-PDCCH.
A configuration information receiving step of receiving configuration information of common control information including configuration information of an Enhanced Physical Downlink Control CHannel (E-PDCCH) provided to a plurality of terminals;

Receiving common control information through the control region to receive the common control information; And

Receiving control information including downlink scheduling assignment or uplink scheduling grant through the E-PDCCH of the data region.
The method of claim 13,

The configuration information of the common control information includes the identifier of the common control information and the location information of the configuration information of the configuration information of the extended E-PDCCH provided to a specific terminal in the common control information.
The method of claim 13,

The configuration information of the common control information is received through the RRC (Radio Resource Control) method of receiving control information of a terminal.
The method of claim 13,

The configuration information of the E-PDCCH includes at least one of a modulation scheme, an encoding rate, an antenna port, a scrambling identifier, a number of layers, and a number of codewords for the E-PDCCH. Way.