KR20180122919A - Method and apparatus for remaining minimum system information transmission in a multi-beam based systems - Google Patents

Abstract

The present disclosure relates to a 5G or pre-5G communication system to support a higher data rate than a 4G communication system such as LTE. According to an embodiment of the present invention, a method of a terminal in a wireless communication system includes: a step of checking information on a plurality of control resource sets to which scheduling information on remaining minimum system information is to be transmitted based on master information block (MIB) received from a base station; a step of checking the scheduling information in the control resource set; and a step of receiving the remaining minimum system information using the scheduling information. It is possible to provide information through the MIB and DCI.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method and apparatus for transmitting residual system information in a multi-

The present invention relates to a base station and a terminal for transmitting remaining system information (RMSI), which is minimum system information excluding a MIB, in a multi-beam based system.

Efforts are underway to develop an improved 5G or pre-5G communication system to meet the growing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, a 5G communication system or a pre-5G communication system is referred to as a 4G network (Beyond 4G Network) communication system or a post-LTE system (Post LTE) system.

To achieve a high data rate, 5G communication systems are being considered for implementation in very high frequency (mmWave) bands (e.g., 60 gigahertz (60GHz) bands). In order to mitigate the path loss of the radio wave in the very high frequency band and to increase the propagation distance of the radio wave, in the 5G communication system, beamforming, massive MIMO, full-dimension MIMO (FD-MIMO ), Array antennas, analog beam-forming, and large scale antenna technologies are being discussed.

In order to improve the network of the system, the 5G communication system has developed an advanced small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, (D2D), a wireless backhaul, a moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Have been developed.

In addition, in the 5G system, the Advanced Coding Modulation (ACM) scheme, Hybrid FSK and QAM Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), the advanced connection technology, Filter Bank Multi Carrier (FBMC) (non-orthogonal multiple access), and SCMA (sparse code multiple access).

On the other hand, in the 5G system, information necessary for performing random access can be defined as minimum system information (hereinafter referred to as minimum SI). The minimum system information may be composed of a master information block and residual system information (hereinafter referred to as RMSI), and a method of transmitting the remaining system information is needed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a base station and a terminal for transmitting residual system information (RMSI) in a multi-beam based system. In particular, it is an object of the present invention to provide information through an MIB and a DCI to schedule an RMSI transport channel (RMSI is transmitted through a PDSCH), and to propose an operation of a base station and a terminal accordingly.

According to an aspect of the present invention, there is provided a method of a terminal in a wireless communication system for solving the above problems, the method comprising the steps of: determining, based on master block information (MIB) Checking the information on the control resource set, checking the scheduling information in the control resource set, and receiving the remaining system information using the scheduling information.

According to another aspect of the present invention, there is provided a method of a base station, the method comprising: receiving master block information (MIB) including information on a plurality of control resource sets to which scheduling information on remaining system information is to be transmitted; Transmitting scheduling information in the control resource set; And transmitting the remaining system information using the scheduling information.

According to another aspect of the present invention, there is provided a terminal comprising: a transceiver for transmitting and receiving signals; And information on a plurality of control resource sets to which scheduling information on the remaining system information is to be transmitted based on master block information (MIB) received from the base station, confirms scheduling information in the control resource set And a controller for receiving the remaining system information using the scheduling information.

According to an aspect of the present invention, there is provided a base station including: a transceiver for transmitting and receiving signals; And transmitting master block information (MIB) including information on a plurality of sets of control resources to which scheduling information on remaining system information is to be transmitted, transmitting scheduling information in the set of control resources, And transmitting the remaining system information by using the remaining system information.

According to the embodiment of the present invention, a method for transmitting scheduling information for RMSI transmission through MIB and DCI is proposed, so that the UE can acquire RMSI clearly.

FIG. 1 is a diagram illustrating an overall UE operation for receiving an RMSI.
2 is a view showing a structure of a minislot according to an embodiment of the present invention.
3 is a view showing another structure of a minislot according to an embodiment of the present invention.
4 is a view illustrating another structure of a minislot according to an embodiment of the present invention.
5 is a diagram illustrating a method of transmitting an SS burst set according to an embodiment of the present invention.
6 is a diagram illustrating another method for transmitting an SS burst set according to an embodiment of the present invention.
7 is a diagram illustrating another method of transmitting an SS burst set according to an embodiment of the present invention.
FIG. 8 is a diagram illustrating SS burst set, CORESET and PDSCH transmission related to RMSI according to Embodiment 1 of the present invention.
9 is a diagram illustrating an operation of a terminal according to the first embodiment of the present invention.
10 is a diagram illustrating the operation of the base station according to the first embodiment of the present invention.
11 is a diagram illustrating an operation of a terminal according to a second embodiment of the present invention.
12 is a diagram illustrating the operation of the base station according to the second embodiment of the present invention.
13 is a diagram illustrating an operation of a terminal according to a third embodiment of the present invention.
14 is a diagram illustrating an operation of a base station according to a third embodiment of the present invention.
15 is a diagram illustrating SS burst set, CORESET and PDSCH transmission related to RMSI according to Embodiment 2 of the present invention.
16 is a diagram illustrating an operation of a terminal according to a fourth embodiment of the present invention.
17 is a diagram showing the operation of the base station according to the fourth embodiment of the present invention.
FIG. 18 is a diagram illustrating an SS burst set, a CORESET related to RMSI,
PDSCH transmission.
19 is a diagram illustrating an operation of a terminal according to a fifth embodiment of the present invention.
20 is a view showing the operation of the base station according to the first embodiment of the present invention.
21 is a diagram showing a structure in which a minislot is composed of two OFDM symbols.
22 is a diagram illustrating a frequency domain reference signal design when a mini-slot is composed of two OFDM symbols.
FIG. 23 is a diagram illustrating a time domain reference signal design when a mini-slot is composed of two OFDM symbols. FIG.
24 is a diagram illustrating an example of OCC mapping for each antenna port.
25 is a diagram illustrating a design example of a TRS for channel estimation using a TRS that is FDM with a PDCCH and / or a PDSCH related to an RMSI.
FIG. 26 is a diagram illustrating a design example of a BRS for channel estimation using a TRS that is FDM with PDCCH and / or PDSCH related to RMSI according to the number of antenna ports.
FIG. 27 is a diagram illustrating a TRS designing method for channel estimation using a TRS that is TDM and PDCCH and / or PDSCH related to RMSI.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

System information (SI) for a terminal in a new radio access technology (RAT) system is divided into minimum system information (minimum SI) and other system information (other SI) . The minimum system information includes minimum information necessary for the UE to perform random access (RA), and is transmitted to all users or terminals in the cell. At this time, the minimum system information may be transmitted to the terminal through broadcasting. The other system information includes information excluding the minimum system information.

The minimum system information may be further divided into a master information block (MIB) and a remaining minimum SI (RMSI).

The MIB is transmitted over the NR-PBCH (hereafter referred to as the PBCH) and the RMSI is transmitted over the NR-PDSCH (hereinafter referred to as the PDSCH). The scheduling information for the PDSCH for transmitting the RMSI can be delivered through the MIB and the DCI, and the information about the NR-PDCCH (hereinafter referred to as the PDCCH) carrying the corresponding DCI is transmitted through the MIB. In the present invention, it is assumed that minimum system information is transmitted through multi-beam sweeping to be delivered to all users in a cell.

At this time, there is a need for a method of transmitting information on a PDCCH carrying a DCI through an MIB and a method of transmitting scheduling information on a PDSCH to transmit an RMSI through the DCI.

FIG. 1 is a diagram illustrating an overall UE operation for receiving an RMSI.

1, a UE includes a control resource set (CORESET) for receiving control information for scheduling an RMSI transmission PDSCH through a PBCH in a synchronization signal (SS) block 110, 111, ) (Hereinafter referred to as RMSI-related CORESET). At this time, the SS block may be a form including a resource for transmitting a synchronization signal and a PBCH for transmitting an MIB. Also, the control resource set refers to a region that the UE must search for in order to acquire control information, and the UE can search for and decode the DCI transmitted through the PDCCH from the control resource set.

In this way, the UE acquires information on the CORESET related to the RMSI, and obtains information for decoding the RMSI transmission PDSCH by checking the control information for scheduling the RMSI transmission PDSCH in the CRESET.

In this case, only the DCI for scheduling the RMSI transmission PDSCH through the RMSI-related CORESET may be transmitted, or the DCI used for other purposes may be transmitted together.

The SS block includes at least the PSS, SSS, PBCH, and DMRS for decoding PBCH. It is assumed that the PBCH of the second SS block 111 among the M SS blocks indicates a CORESET corresponding to the second position among the position information on the total N RMSI related CORESETs. The UE can receive the second CORESET 121 of the total N RMSI-related CORESETs using the same terminal beam as that used for receiving the second SS block 111 among the M SS blocks. That is, in FIG. 1, the UE assumes that the BS uses the same transmission beam to transmit a specific CORESET (or RMSI) indicated by a specific SS block, and the UE determines whether the specific SS block and the specific SS block The same terminal beam can be used to receive a CORESET (or RMSI).

Also, the multiplexing between the CORESET and the PDSCH associated with the RMSI may or may not be the same as in FIG. In addition, the subcarrier spacing (SCS) for transmitting the SS block may be equal to or different from the RMSI-related CORESET and / or PDSCH transmission subcarrier interval, and the RMSI-related CORESET and RMSI transmission PDSCH may have the same subcarrier spacing May be capital or different

[ RMSI  Scheduling]

As mentioned above, the MIB transmitted through the PBCH may include information on the RMSI-related CORESET (s). In addition, in the PBCH, in addition to information on the RMSI-related CORESET (s), some information on the PDSCH for transmitting the RMSI can be provided.

RMSI-related CORESET may be determined by 1) a resource location (eg, search space) to be decoded by one UE in a CORESET based on the SS block received by the UE, 2) or based on the SS block received by the UE The CORESETs that the UE needs to decode may exist independently. If CORESETs that the UE needs to decode exist independently, a CORESET group related to RMSI is set.

For example, one CORESET may be composed of a plurality of OFDM symbols (for example, 30), and the base station may transmit RMSI scheduling information by beam sweeping in the one CORESET. Accordingly, the UE can decode the control information at a specific resource position in one CORESET based on the SS block, and the resource location to be searched by the UE for decoding the control information in the CORESET is referred to as a search area search space.

Alternatively, if a plurality of CORESETs to be decoded by the UE exist independently, the UE can perform decoding by checking the position of the CORESET to be decoded based on the SS block.

As such, the CORESET related to the RMSI can be set to one or more. The configuration information for the RMSI-related CORESET in the MIB may include one or more of the information described below, and some information may be predefined in the standard.

1) Subcarrier interval or Numerology of RMSI-related CORESET (s), CP length (normal CP or extended CP)

- The base station may transmit the subcarrier interval or Numerology of the RMSI-related CORESET (s), the subcarrier interval of the RMSI transmission PDSCH, the Numerology, and the CP length to the UE in the MIB. The subcarrier interval of the RMSI related CORESET (s) and the subcarrier interval of the RMSI transmission PDSCH may be equal to each other. In this case, only one subcarrier interval may be indicated in the MIB.

Alternatively, the base station may not include the information in the MIB, and in this case, it may be specified to be equal to the sub-carrier interval and / or the CP length of the RMSI transmission PDSCH. Alternatively, the standard may be specified to be equal to the CP length and / or the subcarrier interval used for PBCH transmission. In the present invention, the expression of transmitting a channel such as a PBCH may mean that information is transmitted through the channel. 2) DCI aggregation level (AL)

- As in the LTE system, the RMSI scheduling information (DCI) transmitted from the CORESET related to the RMSI can be transmitted through one or a plurality of CCEs, and the base station can transmit the aggregation level, which is a combined number of CCEs, to the UE.

3) Band

The band can be represented by the number of PRBs. This information may be band information for the RMSI-related CORESET (s), or may be band information for the RMSI-related CORESET (s) and PDSCH. In addition, the band may consist of discontinuous PRBs.

On the other hand, the band information may include an indicator indicating whether to start a plurality of PRB allocation, an intermediate position, or a last position in relation to frequency position information to be described later. 4) Frequency location information of RMSI related CORESET (s)

- The MIB may contain frequency-axis information where the RMSI-related CORESET (s) are located. Also, the MIB may include location information on the DCI related to the RMSI scheduling in the CORESET (s). At this time, only RMSI-related DCI information may be transmitted through CORESET (s), or other DCI information may be transmitted together.

On the other hand, the frequency axis information of the CORESET (s) may be the position information of the CORESET in the minimum carrier bandwidth (BW) or the CORESET position information in the PBCH BW. Alternatively, if the system BW is included in the MIB, it may indicate the location of the CORESET in the system BW.

- When the frequency axis information of CORESET (s) is represented by the position information in the minimum carrier BW or PBCH BW, the base station can inform the mobile station of the frequency information of the CORESET in the following manner.

Alt 1. The base station can inform the UE of the frequency information of the CORESET through offset information between the center frequency of the CORESET and the center frequency of the SS block of the terminal.

Alt 2. The base station can inform the UE of the frequency information of the CORESET through the offset information between the beginning part or the end part of the CORESET on the frequency axis and the center frequency of the SS block receiving the terminal.

Alt 3. The base station can inform the UE of the frequency information of the CORESET through the minimum carrier BW or position information of the CORESET in the PBCH BW (e.g., the starting RB number or the RB number associated with the center frequency of the CORESET). In this case, the position information of the CORESET may be an offset value or RB information as described above, or several candidate values may be designated in the standard and selected from among them.

- When the frequency information of the CORESET (s) is represented by the position information in the system BW, the base station can inform the UE of the frequency information of the CORESET in the following manner.

Alt 1. The base station can inform the UE of the frequency information of the CORESET through offset information between the center frequency of the CORESET and the center frequency of the SS block of the terminal.

Alt 2. The base station can inform the mobile station of the frequency information of the CORESET through offset information between the start or end of the CORESET on the frequency axis and the center frequency of the SS block received by the terminal.

Alt 3. The base station can inform the UE of the frequency information of the CORESET through position information of the CORESET in the System BW (e.g., the starting RB number or the RB number associated with the center frequency (center and frequency) of the CORESET). In this case, the position information of the CORESET may be an offset value or RB information as described above, or several candidate values may be designated in the standard and selected from among them.

On the other hand, when frequency information of CORESET (s) is transmitted in the Alt 3 scheme, the system BW must be transmitted in the MIB.

5) Starting position information (time axis starting point position) on the time axis of the RMSI-related CORESET (s)

- Starting position information (time axis starting point position) on the time axis of the RMSI-related CORESET (s) may refer to the position of the starting point of CORESET (s). For example, this value may include information about how many subframes (SFs) in a radio frame or which slot (s) the CORESET (s) starts with. In addition, the starting position information may also include information on how many OFDM symbols in the subframe or slot are to start CORESET (s). Alternatively, at least one of a radio frame number, a subframe or a slot number to which the CORESET (s) is transmitted is fixed, and the starting position information includes information on how the CORESET (s) start from the subframe or the OFDM symbol in the slot . In addition, the base station may additionally inform information on non-fixed parameters, such as a radio frame number, a sub-frame, or a slot number.

When the period information of the CORESET (s) related to the RMSI is set, for example, the period information may be designated by a multiple of 20 ms, which is the default SS period assumed by the initial cell access user. For example, if the multiple has a value of 2 (or may be expressed as 10 in binary), the period of the RMSI-related CORESET (s) is 40 ms.

- The start position information and period information of the RMSI related CORESET may be the same as the start position information (time axis position) and the period information of the RMSI transmission PDSCH. In this case, the MIB may not include the start position information and the cycle information of the RMSI-related CORESET. Or information indicating that it is the same as the information of the RMSI related PDSCH can be transmitted through the MIB.

6) SS burst set period information

- The SS burst set can mean a plurality of SS blocks. For example, the 1 st to M th SS blocks in Fig. 1 may be referred to as an SS burst set. The SS block in the SS burst set may or may not be continuously mapped. The initial access terminal sets the SS burst set period to 20 ms, but the network can set the period of the SS burst set to the UE through the MIB, cell-specific RRC (SIB), and UE-specific RRC signaling.

7) Information related to the system beam (information on whether it is a single beam based system or a multi-beam based system)

The information may be represented by 1 bit in the MIB, or may be represented as " actual number of SS blocks in an SS burst set " in the SS burst set. For example, if the number of SS blocks actually transmitted in the SS burst set is 1, the UE can recognize that the corresponding system is a single beam based system. If the number is greater than 1, the UE can recognize that the system is a multi-beam based system.

8) QCL information (e.g., QCL information between MIB transmission beam and DCI transmission beam) (1 bit)

This information refers to information on whether the UE can assume a QCL relationship between the PSS / SSS in the SS block or the PBCH DMRS and the PDCCH DMRS received from the RMSI related CORESET corresponding to the SS block It is possible. The information can be represented by 1 bit. For example, when the value is " 0 ", the UE can not assume the QCL relationship. When the value is " 1 ", the UE can assume the QCL relationship. At this time, the PDCCH DMRS of the CORESET can be used in combination with the terms CORESET DMRS, PDCCH DMRS, and the like.

If QCL is established, it indicates that the base station transmit beam transmitting a particular SS block is the same as the beam carrying the search space or CORESET in the corresponding specific RMSI related CORESET. Therefore, if the QCL is established, the terminal can transmit the RMSI-related CORESET or the search space in the CORESET using the base station transmission beam transmitting the SS block. Can be known.

On the other hand, if the QCL is not established, the above-described relation may not be established, and the number of times of blind decoding of the terminal may be increased.

9) Number of minislots (search space in CORESET or mini-slot number composed of CORESET and PDSCH)

- A minislot can mean a minimum schedulable unit. But may also be configured with at least one OFDM symbol, and may be configured to include at least one of a control channel and a data channel.

In this case, the information on the number of minislots can refer to the number of search spaces transmitted through different beams in one CORESET or the total number of CORESETs constituting a CORESET group. This information may also refer to the number of mini-slots that are transmitted through different beams in the PDSCH. Or this information may refer to the number of minislots including both the search space or CORESET and PDSCH in COREST.

- If information is transmitted via the MIB to the "number of SS blocks actually transmitted in the SS burst set" information, or between the PSS / SSS in the SS block or the PBCH DMRS and the PDCCH DMRS in the CORESET, this information is set in the MIB configuration may be unnecessary. This is because the UE can know the RMSI-related CORESET or the beam that transmits the search space in the CORESET using the base station transmission beam transmitting the SS block.

- If one mini-slot refers to a unit that includes both the search space in CORESET or both CORESET and PDSCH, it may not be necessary for information to be included in the MIB to be described later, as long as this information is set in the MIB .

10) Number of OFDM symbols in one mini-slot

- If one CORESET for RMSI is set, this information can be interpreted as "the number of OFDM symbols constituting one search space within one CORESET".

- Alternatively, this information can be interpreted as "the number of OFDM symbols forming one CORESET" when multiple CORESETs corresponding to the SS block (s) are set for the RMSI.

Or, if CORESET and PDSCH are included in the mini-slot, this information may refer to the number of OFDM symbols used to transmit CORESET and PDSCH. Therefore, it may refer to a monitoring space of a search space or a CORESET in one CORESET. In this case, it may be unnecessary that information 14) to be described later is included in the MIB.

11) RMSI-related CORESET (s) or PDSCH transmission ON / OFF (1bit)

- This information is information that indicates whether CORESET or PDSCH related to RMSI is transmitted and may be replaced with CORESET or PDSCH period information related to RMSI (for example, if period related parameter = 0, CORESET or PDSCH related to RMSI May not be transmitted (OFF)

12) System BW

: If the system BW is transmitted via the MIB, the frequency axis positions at which the RMSI related PDCCH and PDSCH are transmitted may be freely scheduled in the space within the system BW. However, if the system BW is not transmitted through the MIB, the PDCCH and the PDSCH associated with the RMSI can be transmitted only within the minimum carrier BW (or the minimum system BW), and the transmission frequency position may be fixed.

13) QCL mapping information

When only one CORESET related to RMSI is set, the QCL mapping information indicates how many SS blocks are associated with one search space in the CORESET. For example, if the QCL relationship is 1: 1, the number of search spaces in the CORESET and the number of SS blocks actually transmitted are the same.

- When a RMSI related CORESET group is set, the QCL mapping information indicates how many SS blocks are associated with one CORESET. For example, if the QCL relationship is 1: 1, then the total number of CORESETs is equal to the number of SS blocks actually transmitted.

On the other hand, the QCL information of 8) and the QCL mapping information of 13) can be set in various ways. For example, when the QCL mapping information is set, the QCL may be regarded as being set, and the QCL information may not be set.

Alternatively, the QCL mapping information may be predetermined and may be set to indicate only whether QCL is set using only the QCL information.

Alternatively, the QCL information and the QCL mapping information may be combined and expressed by a predetermined number of bit information. For example, if 2 bits are used, 00 is set to QCL, 01 is set to QCL, 1 is set to 1, 1 is set to QCL, 10 is set to 1: 2, 11 is set to QCL And the relation is 1: 3.

14) CORESET time position information (search space position information associated with SS block in one CORESET or CORESET mapping information associated with SS block in CORESET group)

- The CORESET time location information, along with the QCL relationship information, can tell where the position of each search space in a CORESET is on the time axis

- Alternatively, this information, along with the QCL relationship information, can indicate how each CORESET in the CORESET family is mapped on the time axis. This information may be information indicating the position of the CORESET in the slot through which the RMSI related CORESET is transmitted. For example, each CORESET may be mapped to a contiguous OFDM symbol in a slot, or may be mapped to a discontinuous OFDM symbol.

Thus, the CORESET time position information means information indicating how the CORESET search space or CORESET is mapped on the time axis, and can be referred to as CORESET mapping information.

In particular, if the CORESET is mapped to a discontinuous symbol, the information can be used to indicate where the CORESET is located. For example, the base station informs the start point of the CORESET through the start position information of the CORESET, and then notifies the position (time axis) of the OFDM symbol to which the CORESET is mapped using the CORESET mapping information. Information can be provided. For example, the bit information may indicate the number of symbols to which CORESET is not mapped by using bit information, or may be a method of indicating an index of a predetermined CORESET mapping pattern.

The base station provides scheduling information of the RMSI transmission PDSCH to the UE through the CORESET described above. The UE can confirm the CORESET information through the MIB and obtain the scheduling information for the PDSCH to which the RMSI is to be transmitted through the DCI. The information contained in the DCI that is transmitted through the RMSI-related CORESET (s) may include one or more of the following information, and some information may be predefined in the standard:

1) RMSI payload size

2) MCS

3) Subcarrier interval

- If the corresponding information is not transmitted in the MIB, it can be transmitted from the DCI.

4) Band

- The band can be represented by the number of PRBs. This information may be band information for the RMSI transmission PDSCH and band information for the mini-slot including the RMSI-related CORESET (s) or PDSCH.

5) RMSI transmission PDSCH frequency location information

- RMSI transmission The frequency location information of the PDSCH may or may not be the same as the frequency location of the CORESET included in the MIB. The base station can transmit to the UE whether the frequency position of the RMSI transmission PDSCH is equal to the frequency position of the CORESET using 1-bit information.

If the frequency position of the RMSI transmission PDSCH is different from the frequency position of the CORESET, the base station can transmit the frequency position information of the RMSI transmission PDSCH to the UE. At this time, the method of transmitting the frequency information to the terminal is the same as the method of notifying the frequency information of the CORESET, and is omitted in the following.

6) RMSI transmission Starting position information (time axis starting point position) on the time axis of the PDSCH and period information

- RMSI transmission in the MIB The location information on the time axis of the PDSCH can indicate whether or not it is the same as the time location information of the CORESET. If they are different, the MIB can transmit information about how many slots the RMSI transmission PDSCH is located and transmitted than the slot where the CORESET is located.

7) SS burst set (SS burst set)

- If the corresponding information is not transmitted in the MIB, the base station can transmit period information on the SS burst set to the UE using the DCI.

8) Information related to the system beam (information about whether it is a single beam based system or a multi-beam based system)

The information may be represented by 1 bit in the DCI, or may be represented as " actual number of SS blocks in SS burst set " in the SS burst set. For example, if the number of SS blocks actually transmitted in the SS burst set is 1, the UE can recognize that the corresponding system is a single beam based system. If the number is greater than 1, the UE can recognize that the system is a multi-beam based system.

9) QCL information (QCL information between MIB or DCI transmission beam and RMSI transmission beam) (1bit)

- This information may refer to QCL information between the MIB or DCI transmission beam and the RMSI transmission beam. The QCL information between the MIB or DCI transmission beam and the RMSI transmission beam can be referred to as inter-beam QCL information. At this time, terms such as first inter-beam QCL information and inter-beam second QCL information can be used to distinguish between QCL information between MIB transmission beam and DCI transmission beam and QCL information between MIB or DCI transmission beam and RMSI transmission beam .

If the QCL between the MIB transmission beam (PBCH DMRS) and the RMSI (RMSI transmission PDSCH's DMRS) transmission beam is established, it indicates that the base station transmission beam transmitting the specific SS block is the same as the beam transmitting the corresponding specific RMSI transmission PDSCH . Therefore, when the QCL is established, the BS transmits a RMSI transmission PDSCH using the base station transmission beam for transmitting the SS block. .

If the QCL is not established, the above-described relation may not be established, and the number of times of blind decoding of the terminal may be increased.

10) Number of minislots (number of mini-slots configured with PDSCH)

- A minislot can mean a minimum schedulable unit. But may also be configured with at least one OFDM symbol, and may be configured to include at least one of a control channel and a data channel.

In this case, information on the number of mini-slots may refer to the number of mini-slots transmitted through different beams in the PDSCH. If the information on the number of SS blocks actually transmitted in the SS burst set is transmitted via the MIB / DCI, or if the QCL between the PSS / SSS or PBCH DMRS in the SS block or the DMRS in the RMSI transmission PDSCH is guaranteed, No configuration is required. This is because the UE can know the beam transmitting the PDSCH related to the RMSI using the base station transmission beam transmitting the SS block.

11) Number of OFDM symbols in one mini-slot

- If the corresponding information is not set in the MIB or CORESET and PDSCH are transmitted in different mini-slots during mini-slot design, that information can be included in the DCI.

[Mini-slot design]

The RMSI-related CORESET or PDSCH transmission mini-slot described above may be configured in various forms, and information to be configured in the MIB and the DCI and the RMSI receiving operation of the UE may vary depending on the type of the mini-slot.

As described above, the mini-slot refers to a minimum schedulable unit, which may refer to one search space unit in one CORESET, a unit in which each CORESET is transmitted, or one May refer to the unit through which the RMSI of the RMSI is transmitted or may be referred to as a unit to be transmitted with one search space or one CORESET and PDSCH. Details will be described below.

2 is a view showing a structure of a minislot according to an embodiment of the present invention.

FIG. 2 shows an example of a CORESET or PDSCH transmission mini-slot associated with an RMSI.

Referring to FIG. 2, CORESET and PDSCH periods related to RMSI are the same, and period information of CORESET and PDSCH can be transmitted through MIB. At this time, CORESET and PDSCH can be included in the same minislot, and the period of the minislot can be transmitted to the UE via the MIB. Here, the period information may mean monitoring period information.

In addition, the number of MIN-slots (or the total number of CORESETs) for transmitting RMSI-related CORESET and PDSCH and the number of OFDM symbols in a mini- slot can be set in the MIB. At this time, CORESET may be transmitted only in some OFDM symbols in the mini-slot.

FIG. 2 shows a structure in which CORESET and PDSCH are FDM in one OFDM symbol in a mini-slot including both CORESET and PDSCH.

3 is a view showing another structure of a minislot according to an embodiment of the present invention.

3, the CORESET and PDSCH periods related to the RMSI are the same, and the CORESET and PDSCH period information can be transmitted through the MIB. At this time, each minislot may be configured to include either CORESET or PDSCH.

In addition, the number of MIN-slots (or the total number of CORESETs) for transmitting RMSI-related CORESET and PDSCH and the number of OFDM symbols in a mini- slot can be set in the MIB. At this time, CORESET may be transmitted only in some OFDM symbols in the mini-slot. Alternatively, only the number of OFDM symbols to which a CORESET in a mini- slot is transmitted may be set in the MIB, and the number of OFDM symbols to be transmitted through PDSCH may be set through DCI.

4 is a view illustrating another structure of a minislot according to an embodiment of the present invention.

In the case of FIG. 4, the RMSI-related CORESET and PDSCH periods may or may not be the same. The period information of the CORESET can be transmitted through the MIB, and the PDSCH period information can be transmitted through the DCI. In the case of FIG. 4, one mini-slot shows a design consisting only of a search space or CORESET or PDSCH constituting one CORESET.

The number of mini-slots that transmit RMSI related search space or CORESET and PDSCH may be set in the MIB, or the number of mini-slots that transmit PDSCH may be set through DCI. The number of OFDM symbols in a mini-slot transmitting a search space or CORESET and PDSCH may be set in the MIB, or only the number of OFDM symbols constituting a search space or CORESET is set in the MIB, and the number of OFDM symbols transmitting PDSCH is DCI .

[ PDCCH / PDSCH  Time axis position and period setting]

The CORESET time axis start point position and period information related to RMSI can be transmitted from the MIB, and the RMSI transmission PDSCH time axis position information can be transmitted from the MIB or DCI. PDCCH / PDSCH transmission time axis position and period information setting, transmission cases of the SS burst set transmitted from the base station through FIGS. 5, 6 and 7 are shown.

The terminal may recognize the transmission period of the SS burst set differently depending on the state (i.e., initial connection, CONNECTED, IDLE state). For example, a UE desiring to perform an initial connection can recognize the transmission period of the SS burst set as 20 ms.

The base station can configure a period of an SS burst set different from a period recognized by the initial access terminal with respect to the terminal in the connected state (CONN terminal), and then the terminal sets an SS burst set The SS burst set can be received according to the period. SS burst set period values that the base station can configure are 5, 10, 20, 40, 80, 160ms, and so on.

An idle terminal (IDLE terminal) may use the configured SS burst set period when it is connected to the network if necessary or may receive an SS burst set based on the same SS burst set period as the initial connected user It is possible.

5 to 7, the SS burst set transmission method for various cases is shown. In this case, P _IA represents the initial access terminal-based SS burst set period, and P _SS represents the SS burst set period set by the base station (for CONN and / or IDLE users). P _Actual represents the SS burst set period that the base station actually transmits (for CONN and / or IDLE users).

5 is a diagram illustrating a method of transmitting an SS burst set according to an embodiment of the present invention.

Referring to FIG. 5, it can be seen that the period P _SS 510 of the SS burst set established by the base station is identical to the period P _Actual 520 of the SS burst set actually transmitted by the base station. In addition, the period of the SS burst set set by the base station may be smaller than the period P _IA (530) of the initial access terminal based SS burst set.

That is, in such a case, the terminal can receive the SS burst set in a shorter period than that in the initial connection, by setting the base station.

6 is a diagram illustrating another method for transmitting an SS burst set according to an embodiment of the present invention.

6, it can be confirmed that the period P _SS 610 of the SS burst set set by the base station is the same as the period P _Actual 620 of the SS burst set actually transmitted by the base station. In addition, the period of the SS burst set set by the base station may be larger than the period P _IA (630) of the initial access terminal based SS burst set.

That is, in such a case, according to the setting of the base station, the terminal can receive the SS burst set at a longer period than that at the time of initial connection.

7 is a diagram illustrating another method of transmitting an SS burst set according to an embodiment of the present invention.

Referring to FIG. 7, it is confirmed that the period P _IA (710) of the initial access terminal-based SS burst set is the same as the period P _Actual (720) of the SS burst set actually transmitted by the base station. In addition, the period of the SS burst set actually transmitted by the base station may be smaller than the period P _SS (710) of the SS burst set set by the base station.

That is, in such a case, the base station transmits the set of SS bursts with the initial access terminal-based SS burst set period, while the terminal can receive the set of SS bursts with a period longer than the period of the SS burst set actually transmitted by the base station.

Meanwhile, the position of the time axis starting point of the RMSI related CORESET (s) described in FIG. 4 or the CORESET (s) or PDSCH described in FIGS. 2 and 3 can be fixed. When the position of the time axis starting point is fixed, The information bits for setting the information can be saved. That is, when the start point of the CORESET or PDSCH is fixed, the start position information included in the MIB or DCI described above may be omitted.

For example, the CORESET (s) in FIG. 4 or the CORESET (s) in FIGS. 2 and 3 or the PDSCH is a method for fixing the starting point position of the CORESET or PDSCH, wherein the SS burst set transmitting the last PBCH in the last PBCH TTI It can be assumed that transmission starts in the Jth slot of the + Kth frame based on the frame in which the transmission starts.

In the case of FIG. 4, the transmission position of the PDSCH relative to the transmission start time of the CORESET (s) can be fixed. Alternatively, the absolute time position at which the CORESET (s) or CORESET (s) or PDSCH is transmitted may be fixed. For example, assume that the transmission starts in the Jth slot in the radio frame with a number that can get the R value when you take mod with Y.

Transmission time of CORESET (s) or CORESET (s) / PDSCH The reference point of CORESET (s) or CORESET (s) or PDSCH that the UE recognizes when it is stationary can be specified in one of the following ways:

Alt 1. SS burst set that transmits the last PBCH in the PBCH TTI calculated based on max (P _SS )

Alt 2. PB burst that is calculated based on P _IA value. SS burst set that transmits last PBCH in TTI.

3. Alt P _SS (or P _Actual) value is sent from the MIB, P _SS value (or P _Actual value) from the set SS burst transmission for transmitting the PBCH in the last PBCH TTI is calculated based on the time reference

Alt 4. Initial Access Terminals: Based on the value of P _IA. PBCH calculated on the basis of the SS burst set transmitting the last PBCH within the TTI.

CONN / IDLE terminal: SS burst set that transmits the last PBCH within the PBCH TTI calculated based on the P _SS value

For Alt 4, the CORESET (s) or CORESET (s) or PDSCH transmission time of the actual base station is calculated based on the min (P _IA , P _SS ) value.

It is also possible to designate an absolute CORESET (s) transmission position in addition to a method of fixing the transmission time point of CORESET (s) or CORESET (s) or PDSCH based on PBCH TTI as in Alt 1 to 4 described above. For example, RMSI-related CORESET (s) or CORESET (s) or PDSCH may be transmitted from the Uth slot in a frame satisfying mod (SFN, 5) = 0.

Meanwhile, the PBCH TTI can be utilized also in the RMSI-related CORESET (s) of FIG. 4 or the CORESET (s) of FIGS. 2 and 3, or the PDSCH or PDSCH period. For example, CORESET (s) or CORESET (s) or PDSCH or PDSCH may be assumed to be transmitted per L PBCH TTI at a specified location as described above. L value can be set in the MIB when setting the period of the CORESET (s) or CORESET (s) / PDSCH related to the RMSI, and L value can be set in the DCI when setting the period of the PDSCH related to the RMSI. The PBCH TTI value that the terminal assumes can be specified in one of the following ways:

Alt 1. PBCH TTI based on the value of max (P _SS )

Alt 2. PBCH TTI based on P _IA value

Alt 3. PB _SS (or P _Actual ) value is transmitted in the MIB and is calculated based on the P _SS value (or P _Actual value)

PBCH TTI refers to a period in which the same PBCH contents are guaranteed to be transmitted. If it is guaranteed that the same PBCH contents are transmitted during a set of consecutive Q SS bursts in the standard, then the PBCH TTI is " ) x Q ".

It is also possible to designate an absolute period value in addition to a method of setting the transmission period of CORESET (s) or CORESET (s) or PDSCH or PDSCH based on PBCH TTI as in Alt 1 to 3 described above. For example, it is possible to select the period of the RMSI-related CORESET (s) or CORESET (s) / PDSCH or PDSCH in the standard at {40, 80, 160, 320 ms}, and the information may be configured as 2bits information It is.

Alternatively, the SS period (i.e., 20 ms) assumed by the initial access terminal in the RMSI-related CORESET (s) in FIG. 4 or the CORESET (s) / PDSCH or PDSCH periods in Figs. 2 and 3 may be utilized.

[ RMSI  After receiving RMSI Time of application]

The multi-beam based system performs beam sweeping for signal transmission to be received by all terminals in the entire cell. In the case of MIB and RMSI, information is transmitted to a terminal through beam sweeping. During beam sweep, information of the same MIB and RMSI is transmitted through beams of different directions. Each terminal can receive some or all of the beams being swept. Therefore, the time of receiving the RMSI may be different for the same RMSI according to the UE, and the time of applying the RMSI information should be designated even though the RMSI is received through the beams of different directions. In particular, the RMSI is information directly received from the CORESET, and the UE may not know the absolute starting point of the beam-swapped RMSI.

The application time point of the RMSI received by the UE can be specified using at least one of the following methods:

Alt 1. How to set applicable radio frame, sub-frame, and slot information in RMSI

Alt 2. Set the RMSI in the reference position (radio frame, subframe, slot number, etc.) and apply the RMSI after the radio frame / subframe / slot after offset (+ Q) from the reference point. In this case, the offset value may be transmitted to the UE via the MIB, the RMSI, or the DCI, or may be predetermined.

Alt 3. RMSI-related method of applying RMSI from the starting point of the offset (+ Q) th radio frame based on the radio frame from which transmission of CORESET starts. In this case, the offset value may be transmitted to the terminal through the MIB or the DCI or may be predetermined.

Alt 4. Method of applying RMSI from the starting point of the offset (+ Q) th radio frame, based on the radio frame from which transmission of RMSI-related CORESET starts. At this time, the offset value Q can be set in the RMSI.

Alt 5. After the RMSI TTI assumed by the UE, the SS period (20ms) used by the initial access terminal starts

Hereinafter, various embodiments according to the MIB and the RMSI scheduling information in the DCI and the mini-slot design will be described.

[Example 1]

The present embodiment shows a case where a cycle of CORESET (s) and a PDSCH are determined based on P _SS when a mini-slot is transmitted in the structure of Fig. In addition, this embodiment explains a case where the UE does not need blind decoding to receive a search space or a CORESET and a PDSCH in a CORESET related to an RMSI. That is, the case where the QCL information can be set to ON will be described. At this time, the QCL information can be set to ON by using 1-bit information.

In addition, the present embodiment describes a case where one mini-slot includes both a search space or one CORESET and a PDSCH. In this embodiment, a QCL relationship is established between the PSS / SSS or PBCH DMRS in the SS block and the search space / PDCCH DMRS in each CORESET, and the relationship is 1: 1.

FIG. 8 is a diagram illustrating SS burst set, CORESET and PDSCH transmission related to RMSI according to Embodiment 1 of the present invention.

Referring to FIG. 8, one SS burst set 810 may include 16 SS blocks. Here, it is assumed that the first SS block 811 is transmitted in the first OFDM symbol of the SS burst set transmission start frame. Also, when the same PBCH content is guaranteed to be transmitted during a set of four consecutive SS bursts in the standard, assume that the position is the frame start point corresponding to the transmission start point of the fourth set of SS bursts. However, the embodiment of the present invention is not limited thereto.

The UE can know the start point of the frame in which the SS burst set is transmitted through the SS block reception (through the PBCH or TSS in the SS block), and if the position at which the RMSI related CORESET (s) is transmitted in the standard is fixed Quot; fixed value " 840), the starting point of the CORESET (s) associated with the RMSI can be known based on the frame start point.

In this case, when the position of the CORESET is fixed, the absolute position of the starting point of the CORESET may be fixed, or may be set to an offset from a starting point of the frame in which the SS burst set is transmitted. When the position of the start point of the CORESET is fixed, information indicating this can be transmitted to the UE via the MIB or the DCI.

For example, when the absolute position of the starting point of the CORESET is fixed, indexes of system frames, subframes, slots, and symbols may be determined as described above, or some information may be transmitted to the UE through the MIB or DCI. Or the offset from the starting point of the frame in which the SS burst set is transmitted may be predetermined or transmitted to the terminal via the MIB or DCI.

Therefore, the number of SS blocks transmitted in the SS burst set may be set to 16 in the parameters in the MIB, and the terminal can recognize that the corresponding system is a multi-beam based system using the information.

Also, the QCL information or the QCL parameter (QCL information between the PSS / SSS in the SS block or the PBCH DMRS and the PDCCH DMRS related to the RMSI in the embodiment) may be set to ON (i.e., quasi-co-location establishment).

In addition, the number of OFDM symbols may be set to two in one mini-slot. Therefore, the terminal can directly estimate the search space or CORESET position that can be received based on the beam received from the SS block (including the PBCH in the SS block). This is because the QCL is established, so that the base station transmission beam transmitting the specific SS block is the same as the beam transmitting the corresponding search space or CORESET.

For example, referring to FIG. 8, if the terminal receives a second SS block 812 in the SS burst set, the terminal may receive the DCI in the second CORESET. In this case, since one MINI slot includes two OFDM symbols, the UE can receive the DCI including the RMSI related search space or the RMSI scheduling information transmitted from the third OFDM symbol 820 from the start of CORESET transmission (Since it is QCL).

On the other hand, if the SS burst set period set in the network is 40ms and the L value for indicating the RMSI related CORESET (s) / PDSCH period is 1, it is guaranteed that the same PBCH contents are transmitted during the set of four consecutive SS bursts in the standard The transmission period is 160 ms (= 40 ms x 4 x 1) (830) based on the point where the RMSI-related CORESET (s) / PDSCH starts.

However, some of the information may be transmitted through the DCI. In the present embodiment, only some information that can be included in the MIB and the DCI is described, and information other than the above-described information may be included.

9 is a diagram illustrating an operation of a terminal according to the first embodiment of the present invention.

Referring to FIG. 9, the terminal may perform synchronization at step S910. The UE can receive the PSS and the SSS from the base station and perform synchronization.

Then, the terminal can receive the MIB through the PBCH in step S920. Accordingly, the UE can confirm the CORESET information through the MIB and receive the RMSI scheduling information (DCI) from the CORESET.

At this time, the number of SS blocks transmitted in the SS burst set may be set to 16 in the MIB, and the terminal can recognize that the corresponding system is a multi-beam based system using the information.

In addition, the MIB may have the QCL information or the QCL parameter set to ON.

In addition, the number of OFDM symbols may be set to two in one mini-slot. Therefore, the terminal can directly estimate the search space or CORESET position that can be received based on the beam received from the SS block (including the PBCH in the SS block). The details are the same as those described above, and will not be described below.

In addition, the SS burst set period may be set to 40 ms, and an L value for indicating the RMSI-related CORESET (s) / PDSCH period may be set to 1 in the MIB. Since the same PBCH contents are ensured to be transmitted during the set of four consecutive SS bursts in the standard, the UE shall have a transmission period of 160 ms (= 40 ms x 4 x 1) based on the point at which the RMSI-related CORESET (s) / PDSCH starts Can be confirmed.

In addition, the MIB may include information indicating that the position of the PDCCH or the PDSCH is fixed.

However, some of the information may be transmitted through the DCI. In the present embodiment, only some information that can be included in the MIB and the DCI is described, and information other than the above-described information may be included.

Based on the MIB information, the terminal can detect a frame boundary in step S930. That is, the UE can check the start point of the radio frame based on the MIB information. The terminal can confirm the position of the CORESET, the cycle of the CORESET, etc. through the PBCH or the TSS.

Then, the terminal can receive the DCI in step S940. Specifically, the UE can receive the DCI scheduling the RMSI at the location of the identified CORESET.

Then, the terminal can receive the RMSI in step S950. That is, the UE can receive the RMSI through the PDSCH resource identified through the DCI.

10 is a diagram illustrating the operation of the base station according to the first embodiment of the present invention.

Referring to FIG. 10, the base station can transmit the SS burst set in step S1010. The base station can transmit a set of SS bursts including PSS, SSS, TSS, and MIB.

At this time, information on CORESET may be included in the MIB, and the BS may transmit the RMSI scheduling information (DCI) to the UE in the CORESET.

Specifically, the information included in the MIB is the same as that described in FIG. 9, and is omitted in the following description.

Thereafter, the base station may transmit the DCI in step S1020. Specifically, the base station can transmit a DCI that schedules the RMSI at a specified CORESET location.

The base station can transmit the RMSI in step S1030. The BS may transmit the RMSI through the PDSCH resource specified through the RMSI scheduling information.

[Example 2 and Example 3]

2 and 3 illustrate cases in which the period of the CORESET (s) and the PDSCH are determined based on P _SS when a mini-slot is transmitted with the structure of FIG. 2. In addition, this embodiment explains a case where blind decoding is required for a UE to receive PDCCH and PDSCH related to RMSI. That is, the case where the QCL information is not set or can be set to OFF will be described. At this time, the QCL information can be set to OFF using 1-bit information.

In addition, the present embodiment describes a case where one mini-slot includes both a search space or one CORESET and a PDSCH.

In Embodiment 2 and Embodiment 3, as shown in FIG. 8, 16 SS blocks are transmitted in one SS burst set. The UE can know the starting point of the frame in which the SS burst set is transmitted through the SS block reception (through the PBCH or TSS in the SS block), and if the position where the RMSI related CORESET (s) is transmitted in the standard is fixed Quot; fixed value "), the starting point of the CORESET (s) associated with the RMSI can be known based on the frame start point.

11 is a diagram illustrating an operation of a terminal according to a second embodiment of the present invention.

Referring to FIG. 11, the terminal may perform synchronization in step S1110. The UE can receive the PSS and the SSS from the base station and perform synchronization.

Then, the terminal can receive the MIB through the PBCH in step S1120. Accordingly, the UE can confirm the CORESET information through the MIB and receive the RMSI scheduling information (DCI) from the CORESET.

At this time, the number of SS blocks transmitted in the SS burst set may be set to 16 in the parameters in the MIB, and the terminal can recognize that the corresponding system is a multi-beam based system.

In addition, the QCl information or the QCL parameter (in this embodiment, the PSS / SSS in the SS block or the QCL information between the PBCH DMRS and the PDCCH DMRS related to the RMSI) may be set to OFF (i.e., quasi-co-location incomplete). Therefore, the UE can not directly estimate the position of the search space or CORESET that can be received based on the beam received from the SS block (including the PBCH in the SS block). Therefore, it may be necessary to perform blind decoding to read the DCI for a CORESET (s) / PDSCH period beginning at the beginning of the CORESET (s) associated with the RMSI. Of course, in the case of a single beam based system, the corresponding DCI will be transmitted at the time when the RMSI related CORESET starts transmission, and the UE may not perform continuous blind decoding.

In addition, if the SS burst set period set in the network is 40ms and the L value for indicating the RMSI related CORESET (s) or PDSCH period is set to 1 in the MIB, the same PBCH contents The transmission period is 160 ms (= 40 ms x 4 x 1) based on the point where the RMSI-related CORESET (s) / PDSCH starts.

However, some of the information may be transmitted through the DCI. In the present embodiment, only some information that can be included in the MIB and the DCI is described, and information other than the above-described information may be included.

Based on the MIB information, the terminal can detect a frame boundary in step S1130. That is, the UE can check the start point of the radio frame based on the MIB information. The terminal can confirm the position of the CORESET, the cycle of the CORESET, etc. through the PBCH or the TSS.

Then, the terminal can receive the DCI in step S1140. Specifically, the UE can receive the DCI scheduling the RMSI at the location of the identified CORESET.

In the DCI reception, the number of OFDM symbols used for RMSI transmission can be set, and PDSCH is transmitted to the remaining resources except the resources occupied by the PDCCH among the search space or the bandwidth in which the CORESET and PDSCH are transmitted in the mini-slot. . Therefore, the RMSI payload is transmitted from the corresponding resource and the code rate according to the RMSI payload can be determined. In this embodiment, for example, the number of OFDM symbols used for RMSI transmission in a minislot may be set to two.

On the other hand, if the number of actual SS blocks in the SS burst set is 1, the corresponding system is a single beam based system and the DCI can be read to the location where the RMSI related CORESET is transmitted without the UE performing blind decoding.

12 is a diagram illustrating the operation of the base station according to the second embodiment of the present invention.

Referring to FIG. 12, the base station can transmit the SS burst set in step S1210. The base station can transmit a set of SS bursts including PSS, SSS, TSS, and MIB.

At this time, information on CORESET may be included in the MIB, and the BS may transmit the RMSI scheduling information (DCI) to the UE in the CORESET.

Specifically, the information included in the MIB is the same as that described in FIG. 11, and is omitted in the following description.

Thereafter, the base station may transmit the DCI in step S1220. Specifically, the base station can transmit a DCI that schedules the RMSI at a specified CORESET location. As described above, the DCI may include the number of OFDM symbols used for RMSI transmission, and the details are the same as those described above.

The base station can transmit the RMSI in step S1230. The BS may transmit the RMSI through the PDSCH resource specified through the RMSI scheduling information.

13 is a diagram illustrating an operation of a terminal according to a third embodiment of the present invention.

Referring to FIG. 13, the mobile station can perform synchronization in step S1310. The UE can receive the PSS and the SSS from the base station and perform synchronization.

Then, the terminal can receive the MIB through the PBCH in step S1320. Accordingly, the UE can confirm the CORESET information through the MIB and receive the RMSI scheduling information (DCI) from the CORESET.

At this time, the number of SS blocks transmitted in the SS burst set or the single beam / multi-beam based system may not be set in the parameters in the MIB. Therefore, since the UE can not know whether the corresponding system is a multi-beam based system, all UEs must perform an operation for blindly reading the DCI from the transmission start position of the CORESET (s) until the next cycle. Therefore, QCL information and the like may not be included in the MIB.

Also, when the SS burst set period set in the network is 40ms and the L value for indicating the RMSI related CORESET (s) / PDSCH period is set to 1 in the MIB, the same PBCH contents The transmission period is 160 ms (= 40 ms x 4 x 1) based on the point where the RMSI-related CORESET (s) / PDSCH starts.

However, some of the information may be transmitted through the DCI. In the present embodiment, only some information that can be included in the MIB and the DCI is described, and information other than the above-described information may be included.

Based on the MIB information, the terminal can detect the frame boundary in step S1330. That is, the UE can check the start point of the radio frame based on the MIB information. The terminal can confirm the position of the CORESET, the cycle of the CORESET, etc. through the PBCH or the TSS.

Then, the terminal can receive the DCI in step S1340. Specifically, the UE can receive the DCI scheduling the RMSI at the location of the identified CORESET.

In case of DCI reception, the number of OFDM symbols used for RMSI transmission may be set. In addition to the search space of one RMSI-related search space or one of CORESET and PDSCH transmitted in a mini- The PDSCH is transmitted to the resource. Therefore, the RMSI payload is transmitted from the corresponding resource and the code rate according to the RMSI payload is also determined. In this embodiment, for example, the number of OFDM symbols used for RMSI transmission in a minislot may be set to two.

14 is a diagram illustrating an operation of a base station according to a third embodiment of the present invention.

Referring to FIG. 14, the base station can transmit the SS burst set in step S1410. The base station can transmit a set of SS bursts including PSS, SSS, TSS, and MIB.

At this time, information on CORESET may be included in the MIB, and the BS may transmit the RMSI scheduling information (DCI) to the UE in the CORESET.

Specifically, the information included in the MIB is the same as that described in FIG. 13, and is omitted in the following description.

The base station can then transmit the DCI in step S1420. Specifically, the base station can transmit a DCI that schedules the RMSI at a specified CORESET location. As described above, the DCI may include the number of OFDM symbols used for RMSI transmission, and the details are the same as those described above.

The base station can transmit the RMSI in step S1430. The BS may transmit the RMSI through the PDSCH resource specified through the RMSI scheduling information.

[Example 4]

Embodiment 4 shows a case where a cycle of CORESET (s) and PDSCH is determined based on P _SS when a mini-slot is transmitted with the structure of FIG. In addition, the present embodiment describes a case where blind decoding is not necessary for the UE to receive RMSI-related CORESET (s) and PDSCH. That is, the case where the QCL information can be set to ON will be described. At this time, the QCL information can be set to ON by using 1-bit information.

In this embodiment, a QCL relationship is established between the PSS / SSS in the SS block or the PBCH DMRS and the PDCCH DMRS, and a case where the QCL relationship is 1: 1 will be described.

15 is a diagram illustrating SS burst set, CORESET and PDSCH transmission related to RMSI according to Embodiment 2 of the present invention.

Referring to FIG. 15, one SS burst set 1510 may include 16 SS blocks.

The UE can know the starting point of the frame in which the SS burst set is transmitted through the SS block reception (through the PBCH or TSS in the SS block) and if the transmission start point position of the RMSI related CORESET (s) in the standard is fixed Quot; fixed value " 1540), the starting point of the CORESET (s) associated with the RMSI can be known based on the frame start point.

In this case, when the position of the CORESET is fixed, the absolute position of the starting point of the CORESET may be fixed, or may be set to an offset from a starting point of the frame in which the SS burst set is transmitted. When the position of the start point of the CORESET is fixed, information indicating this can be transmitted to the UE via the MIB or the DCI.

For example, when the absolute position of the starting point of the CORESET is fixed, the indices of the system frame, the subframe, the slot, and the symbol may be determined as described above. Or the offset from the starting point of the frame in which the SS burst set is transmitted may be predetermined.

In the parameter in the MIB, the number of SS blocks transmitted in the SS burst set may be designated to 16. The terminal can recognize that the corresponding system is a multi-beam based system using the information.

In addition, the QCL information or the QCL parameter (the PBCH DMRS in the SS block in the present embodiment and the QCL information between the RMSI-related search space or the PDCCH DMRS in the CORESET) may be set to ON (i.e., quasi-co-location establishment) .

In addition, the number of OFDM symbols may be set to one in a mini-slot composed of only one search space or CORESET. Therefore, the terminal can directly estimate the search space or CORESET position that can be received based on the beam received from the SS block (including the PBCH in the SS block). This is because the QCL is established, so that the base station transmission beam transmitting the specific SS block is the same as the beam transmitting the corresponding search space or CORESET.

For example, referring to FIG. 15, if the terminal receives a second SS block 1512 in the SS burst set, the terminal can receive the DCI in the second CORESET. In this case, since the MINI slot includes one OFDM symbol and one CORESET or PDSCH constitutes a minislot, the UE must transmit the second search space from the start of transmission of the minislot including the RMSI-related search space or CORESET, Or DCI including RMSI scheduling information transmitted in a mini-slot 1520 including CORESET (since it is QCL).

On the other hand, if the SS burst set period set in the network is 40ms and the L _PDCCH value for indicating the period of the RMSI related CORESET (s) is 1, it is guaranteed that the same PBCH contents are transmitted during the set of four consecutive SS bursts in the standard The transmission period is 160 ms (= 40 ms x 4 x 1) (1530) based on the point where the CORESET related to the RMSI starts.

In addition, it can be confirmed that the content in the DCI transmitted in the second minislot 1520 has one OFDM symbol in the mini-slot including the PDSCH. However, the information may be included in the MIB.

In addition, since the QCL information or the QCL parameter in the MIB is set to ON, the terminal can directly guess the position of the PDSCH that can receive the beam based on the beam received the SS block (or based on the beam that received the search space / CORESET) .

For example, referring to FIG. 15, if the UE receives a second SS block 1512 in the SS burst set, the UE transmits a second PDSCH mini-slot 1550 from the transmission start time of the RMSI transmission PDSCH mini- (Since it is QCL).

At this time, the starting point of the PDSCH related to the RMSI may also be fixed in the same manner as CORESET. Referring to FIG. 15, the starting point of the RMSI-related PDSCH can also be fixed to a fixed value 1545, and the UE can know the starting point of the RMSI-related PDSCH based on the starting point of the frame in which the SS burst set of the frame is transmitted. When the starting point of the PDSCH is fixed, information indicating this can be transmitted to the UE via the MIB or the DCI.

In this case, when the position of the PDSCH is fixed, the absolute position of the start point of the PDSCH may be fixed or may be set to an offset from a start point of a frame in which the SS burst set is transmitted.

For example, when the absolute position of the start point of the PDSCH is fixed, indexes of system frames, subframes, slots, and symbols may be determined as described above, or some information may be transmitted to the UE through the MIB or DCI. Or the offset from the starting point of the frame in which the SS burst set is transmitted may be predetermined or transmitted to the terminal via the MIB or DCI.

Or the QCL relationship, the RMSI transmission PDSCH can receive based on the resource information scheduled in the corresponding PDCCH. That is, the resource information scheduled in the PDCCH may include RMSI or information on a resource to which data is to be transmitted, and the UE may receive RMSI or data from the PDSCH using the information.

On the other hand, if the SS burst set period set in the network is 40ms and the L _PDSCH value for indicating the RMSI transmission PDSCH period is 1, it is ensured that the same PBCH contents are transmitted during the consecutive four SS burst sets in the standard. The transmission period is 160 ms (= 40 ms x 4 x 1) based on the point where the PDSCH mini-slot starts.

However, some of the information may be transmitted through the DCI. In the present embodiment, only some information that can be included in the MIB and the DCI is described, and information other than the above-described information may be included.

16 is a diagram illustrating an operation of a terminal according to a fourth embodiment of the present invention.

Referring to FIG. 16, the terminal may perform synchronization in step S1610. The UE can receive the PSS and the SSS from the base station and perform synchronization.

In step S1620, the terminal can receive the MIB through the PBCH. Accordingly, the UE can confirm the CORESET information through the MIB and receive the RMSI scheduling information (DCI) from the CORESET.

At this time, the number of SS blocks transmitted in the SS burst set may be set to 16 in the MIB, and the terminal can recognize that the corresponding system is a multi-beam based system using the information.

In addition, the MIB may have the QCL information or the QCL parameter set to ON.

Also, the number of OFDM symbols may be set to one in one mini-slot. Therefore, the terminal can directly estimate the search space or CORESET position that can be received based on the beam received from the SS block (including the PBCH in the SS block). The details are the same as those described above, and will not be described below.

In addition, the SS burst set period may be set to 40 ms, and an L value for indicating the RMSI-related CORESET (s) / PDSCH period may be set to 1 in the MIB. Since the same PBCH contents are ensured to be transmitted during the set of four consecutive SS bursts in the standard, the UE shall have a transmission period of 160 ms (= 40 ms x 4 x 1) based on the point at which the RMSI-related CORESET (s) / PDSCH starts Can be confirmed.

In addition, the MIB may include information indicating that the position of the PDCCH or the PDSCH is fixed.

Based on the MIB information, the terminal can detect a frame boundary in step S1630. That is, the UE can check the start point of the radio frame based on the MIB information. The terminal can confirm the position of the CORESET, the cycle of the CORESET, etc. through the PBCH or the TSS.

Then, the terminal can receive the DCI in step S1640. Specifically, the UE can receive the DCI scheduling the RMSI at the location of the identified CORESET.

Also, the UE can confirm that the number of OFDM symbols in the minislot including the PDSCH is one using the information included in the DCI, and directly predict the position of the PDSCH. However, the information may be included in the MIB. The details are the same as those described above, and will not be described below.

Alternatively, the location of the PDSCH may be fixed, and the details are the same as described above.

Then, the terminal can receive the RMSI in step S1650. That is, the UE can receive the RMSI through the PDSCH resource identified through the DCI.

17 is a diagram showing the operation of the base station according to the fourth embodiment of the present invention.

Referring to FIG. 17, the base station can transmit the SS burst set in step S1710. The base station can transmit a set of SS bursts including PSS, SSS, TSS, and MIB.

At this time, information on CORESET may be included in the MIB, and the BS may transmit the RMSI scheduling information (DCI) to the UE in the CORESET.

Specifically, the information included in the MIB is the same as that described in FIG. 16, and is omitted in the following description.

Then, the base station can transmit the DCI in step S1720. Specifically, the base station can transmit a DCI that schedules the RMSI at a specified CORESET location. Specifically, the information included in the DCI is the same as that described in FIG. 16, and is omitted in the following description.

The base station can transmit the RMSI in step S1730. The BS may transmit the RMSI through the PDSCH resource specified through the RMSI scheduling information.

[Example 5]

The present embodiment shows a case where the period of the CORESET (s) and the PDSCH are determined based on 20 ms, which is the SS period assumed by the initial cell access terminal. In addition, this embodiment shows a case where blind decoding is not necessary in order for a UE to receive RMSI-related CORESET (s) and PDSCH. That is, the case where the QCL information can be set to ON will be described. At this time, the QCL information can be set to ON by using 1-bit information.

Alternatively, the QCL mapping information may be set instead of the QCL mapping information. If the QCL mapping information is set, the terminal can recognize that the QCL is established. This embodiment shows a case where the QCL relationship between the PSS / SSS in the SS block or the PBCH DMRS and the PDCCH DMRS is established and the QCL mapping information is 1: 1.

Also, the present embodiment shows a case in which search space or CORESET is composed of one OFDM symbol, and two OFDM symbols are not transmitted after two consecutive OFDM symbols are transmitted based on the CORESET start point.

18 shows SS burst set, CORESET and PDSCH transmission related to RMSI according to Embodiment 5 of the present invention.

Referring to FIG. 8, one SS burst set 1810 may include 16 SS blocks.

The UE can know the starting point of the frame in which the SS burst set is transmitted through the SS block reception (through the PBCH or TSS in the SS block), and if the position at which the RMSI related CORESET (s) is transmitted in the standard is fixed Quot; fixed value " 1840), the starting point of the CORESET (s) associated with the RMSI can be known based on the frame start point. In this case, when the position of the CORESET is fixed, the absolute position of the starting point of the CORESET may be fixed, or may be set to an offset from a starting point of the frame in which the SS burst set is transmitted.

For example, when the absolute position of the starting point of the CORESET is fixed, indexes of system frames, subframes, slots, and symbols may be determined as described above, or some information may be transmitted to the UE through the MIB or DCI. Or the offset from the starting point of the frame in which the SS burst set is transmitted may be predetermined or transmitted to the terminal via the MIB or DCI.

In the MIB, the number of SS blocks transmitted in the SS burst set may be designated to 16. The terminal may recognize that the corresponding system is a multi-beam based system using the information.

Also, the QCL mapping information (in this embodiment, the PBCH DMRS in the SS block and the QCL information between the RMSI-related search space or the PDCCH DMRS in the CORESET) can be set to 1: 1. The QCL mapping information may be specified in advance in the standard. For example, if four values of 1: 1, 2: 1, 6: 1 and 8: 1 are specified in advance, QCL mapping information can be set through 2 bits in the MIB.

In addition, the mapping information (time position information) for the time axis of the CORESETs or the search space in the CORESETs based on the CORESET start point is determined by information on how many CORESETs or search spaces are continuously transmitted, and information specifying an interval between search spaces.

The number of OFDM symbols in each CORESET or search space can be set to one and the UE can directly guess the position of a CORESET or a search space that can be received based on the beam received from the SS block (including the PBCH in the SS block) . This is because the QCL is established and the QCL mapping relationship is 1: 1, so that the base station transmit beam that transmits a particular SS block is the same as the beam that transmits its corresponding search space or CORESET.

For example, referring to FIG. 18, if the terminal has received a second SS block 1812 in the SS burst set, the terminal may receive the DCI in the second CORESET or search space. In this case, since the number of OFDM symbols of each CORESET is one, the UE can receive a DCI including RMSI scheduling information transmitted through a second CORESET or search space from the start of CORESET transmission related to RMSI So).

In addition, since the SS period assumed by the initial access terminal is 20 ms, when the L _PDCCH value for indicating the CORESET period related to the RMSI is set to 1 in the MIB, the transmission period is 80 ms based on the point where the RMSI related CORESET starts. The UE performs RMSI decoding based on the resource location scheduled through the CORESET related to the RMSI.

However, some of the information may be transmitted through the DCI. In the present embodiment, only some information that can be included in the MIB and the DCI is described, and information other than the above-described information may be included.

19 is a diagram illustrating an operation of a terminal according to a fifth embodiment of the present invention.

Referring to FIG. 19, the terminal may perform synchronization in step S1910. The UE can receive the PSS and the SSS from the base station and perform synchronization.

Then, the terminal can receive the MIB through the PBCH in step S1920. Accordingly, the UE can confirm the CORESET information through the MIB and receive the RMSI scheduling information (DCI) from the CORESET.

At this time, the number of SS blocks transmitted in the SS burst set may be set to 16 in the MIB, and the terminal can recognize that the corresponding system is a multi-beam based system using the information.

Also, the QCL mapping relationship may be set to 1: 1 in the MIB. The information may be represented by a predetermined number of bits of information.

In addition, the MIB may include mapping information (time position information) for time axes of CORESETs or CORESETs in the CORESET based on the CORESET start time, and the time position information may include several CORESETs or search spaces And information specifying the spacing between successive CORESETs or search spaces.

Also, the number of OFDM symbols may be set to one in one mini-slot. Therefore, the terminal can directly estimate the search space or CORESET position that can be received based on the beam received from the SS block (including the PBCH in the SS block). The details are the same as those described above, and will not be described below.

In addition, since the SS period assumed by the initial access terminal is 20 ms, when the L _PDCCH value for indicating the CORESET period related to the RMSI is set to 1 in the MIB, the transmission period is 80 ms based on the point where the RMSI related CORESET starts. The UE performs RMSI decoding based on the resource location scheduled through the CORESET related to the RMSI.

However, some of the information may be transmitted through the DCI. In the present embodiment, only some information that can be included in the MIB and the DCI is described, and information other than the above-described information may be included.

Based on the MIB information, the terminal can detect a frame boundary in step S1930. That is, the UE can check the start point of the radio frame based on the MIB information. The terminal can confirm the position of the CORESET, the cycle of the CORESET, etc. through the PBCH or the TSS.

Then, the terminal can receive the DCI in step S1940. Specifically, the UE can receive the DCI scheduling the RMSI at the location of the identified CORESET. The DCI may include information on a resource location and a period of a PDSCH to which the RMSI is to be transmitted.

Then, the terminal can receive the RMSI in step S1950. That is, the UE can receive the RMSI through the PDSCH resource identified through the DCI.

20 is a view showing the operation of the base station according to the first embodiment of the present invention.

Referring to FIG. 20, the base station can transmit the SS burst set in step S2010. The base station can transmit a set of SS bursts including PSS, SSS, TSS, and MIB.

At this time, information on CORESET may be included in the MIB, and the BS may transmit the RMSI scheduling information (DCI) to the UE in the CORESET.

Specifically, the information included in the MIB is the same as that described in FIG. 19, and is omitted in the following description.

The base station can then transmit the DCI in step S2020. Specifically, the base station can transmit a DCI that schedules the RMSI at a specified CORESET location.

The base station can transmit the RMSI in step S2030. The BS may transmit the RMSI through the PDSCH resource specified through the RMSI scheduling information.

Hereinafter, a method of setting a DMRS pattern according to another embodiment of the present invention will be described.

Before a terminal is connected to a cell (RRC CONN), the base station can set a default DMRS pattern through MIB or RMSI or MIB and RMSI. This pattern may be set differently for each physical channel transmitted or received by the base station or the mobile station. Alternatively, this pattern may be set differently depending on the DL or UL channel.

For example, depending on the service or deployment scenario, the base station can set different default DMRS patterns for the terminal. For example, a cell near the highway can set a more compact pattern in terms of time density to the terminal in the default pattern. Accordingly, the UE decodes the data received through the DL channel by applying the default pattern designated by the base station until the connection with the base station (RRC CONN) is established, or applies the default pattern to the UL channel, To the base station.

The terminal in the connected state (RRC CONN) can update the DMRS pattern when necessary through UE-specific RRC signaling after the connection (CONN). Alternatively, after setting various DMRS pattern sets through UE-specific RRC signaling, a DMRS pattern can be set by signaling one of the DMRS pattern sets in DCI or MAC-CE when necessary.

The determination of UE-specific RRC signaling or terminal-specific DMRS pattern through DCI may be based on the feedback of the UE. For example, it is possible to feed back a frequency selectivity characteristic or a Doppler characteristic of a channel measured at a terminal, and a terminal having a high frequency selectivity based on the information may have a density greater than a frequency axis A BS can allocate a large DMRS pattern, or a BS can allocate a DMRS pattern having a larger density on a time axis to a terminal having a large Doppler. Alternatively, when the UE performs HARQ, the BS may allocate a DMRS having a higher density in the frequency axis and / or the time axis in the DMRS pattern set according to the number of retransmissions. Alternatively, the UE may change the DMRS pattern to at least one of the frequency axis and the time axis depending on the number of retransmissions, and perform UL channel transmission for the transmitted UL channel.

On the other hand, a method of designing a reference signal will be described below. 21 is a diagram showing a structure in which a minislot is composed of two OFDM symbols.

Referring to FIG. 21, OFDM symbols # 1 and # 2 may constitute one mini-slot. At this time, data can be transmitted and received using beams in different directions according to the minislot. In the OFDM symbol of the same minislot, beams in the same direction can be used.

22 and 23 are diagrams showing a reference signal designing method according to the present invention.

22 and 23 illustrate a case where one RMSI-related PDCCH, an RMSI-related PDCCH / PDSCH, and an RMSI transmission PDSCH are composed of two consecutive OFDM symbols as shown in FIG. 21 (when one OFDM symbol of a mini- Beam) is an example of a reference signal (RS) design. 22 and 23 are diagrams illustrating a method of designing a reference signal in a frequency domain and a time domain, respectively.

22 and 23, as one mini-slot is transmitted in the same beam, OCC design and mapping are possible to enable OCC processing on the frequency and time axis as shown in FIGS. 22 and 23. FIG.

That is, the OCC corresponding to the second antenna port is differently applied according to the positions of the even-numbered OFDM symbol and the odd-numbered OFDM symbol (Even / Odd OFDM symbol). A specific OCC mapping example is shown in FIG.

24 is a diagram showing an example of OCC mapping for each antenna port.

Referring to FIG. 24, different OCC mappings may be applied depending on the odd-numbered OFDM symbol, the even-numbered OFDM symbol, and the antenna port. However, the contents shown in Fig. 24 are merely examples, and any form can be modified if the orthogonality is satisfied.

22 and 23, one square represents one RE, the vertical axis represents subcarriers, and the horizontal axis represents OFDM symbols. The specific color is the RE to which the reference signal is transmitted.

The frequency axis length 2-OCC processing can be performed as shown in FIG. In the figure, four subcarriers are used for reference signal transmission on the vertical axis.

In this case, length 2-OCC processing is performed on two subcarrier units, so it can be processed with at least two length 2-OCC reference signals and can be processed with up to three length 2-OCC reference signals.

When processing with two length 2-OCC reference signals, one length 2-OCC 2210 is processed from the first to the second reference signal subcarriers from the top, and one length 2 < / RTI > In case of processing with 3 length 2-OCC reference signals, it can be processed as an additional length 2-OCC (2230) reference signal with the second third subcarrier between the above-mentioned two pairs.

In FIG. 23, in the case of length 2-OCC processing on the time axis, it is possible to process a time axis length 2-OCC reference signal as a continuous OFDM symbol in the reference signal transmission subcarrier. 23, the first RE pair is Ant. OCC = [+1 +1] is used in Port 0 (2310), Ant. OCC = [+1 -1] is used in Port 1 (2320). The second RE pair is Ant. OCC = [+1 +1] is used in Port 0 (2330), Ant. OCC = [-1 +1] is used in Port 1 2340. In a preferred embodiment of the present invention, when beam-sweeping broadcast transmission is based on 2 port SFBC, Can be performed in the same manner. In channel estimation, the reception algorithm can be estimated by considering the frequency or time domain processing selectively or in combination. This example is not limited to PDCCH and / or PDSCH related to RMSI but allows time / frequency domain OCC in all physical (PHY) channels that transmit information to one beam in two or more adjacent OFDM symbols And can be directly applied / extended and modified. The corresponding OCC values can be modified in any form if they are orthogonal to each other. It is possible to apply the OCC length extension according to the extension of the number of OFDM symbols sent through the same beam.

When data or control information is transmitted in the same beam direction in a certain OFDM symbol, the OCC can be applied for channel estimation of a plurality of antenna ports to the RS for channel estimation in the corresponding region. In this manner, the UE can perform channel estimation using only RSs transmitted in OFDM symbols transmitted in the same beam direction.

It is possible to replace the independent reference signal by using a tracking reference signal (TRS) configured in the MIB without an independent reference signal when transmitting PDCCH and / or PDSCH related to the RMSI Design is possible. The TRS may be a reference signal for continuously measuring the time / frequency offset or a reference signal for use in beam management (e.g., base station transmission / terminal receive beam pair determination) or L3 mobility Signal and may be a signal for several of the listed functions.

FIG. 25 is a diagram illustrating a design example of a TRS for channel estimation using a TRS that is FDM with a PDCCH or a PDSCH related to an RMSI.

FIG. 25 illustrates a method of designing a TRS for use as a reference signal for channel estimation of an RMSI-related PDCCH or PDSCH when the PDSCH or PDSCH related to the BRS and the RMSI is FDM within one OFDM symbol.

In FIG. 25, one column indicates one RE and a case where PDSCH and / or PDSCH related to TRS and RMSI are FDM in units of 12 subcarriers. In addition, FIG. 25 is described on the assumption that a base station has eight antenna ports, but the embodiment of the present invention is not limited thereto.

In this case, as shown in FIG. 25, it is proposed that the TRS signals transmitted through the eight antennas are grouped into two units so as to be divided into length-2 OCCs. When beam-sweeping broadcast transmission is based on 2-port SFBC, the channel estimation for the corresponding 2-port can perform channel estimation for each port by decoding 2-subcarrier OCC.

For example, if the PDCCH or PDSCH associated with the RMSI is Ant. Port # 0, # 2, # 4 and # 6 are transmitted to one port or beam, and Ant. In case of 2 port SFBC that transmits the beam consisting of Port # 1, # 3, # 5, and # 7 to another port or beam, channel estimation is performed for each port based on TRS, and based on this, RMSI related PDCCH and / 2 < / RTI >

26 is a diagram illustrating a design example of a BRS for channel estimation using a TRS that is FDM with PDCCH or PDSCH related to RMSI according to the number of antenna ports.

FIG. 26 is an example for TRS transmission when two or four TRS transmission antenna ports are smaller than eight.

Since the number of antenna ports used for TRS transmission is a situation in which the UE may not know before decoding the PDCCH or PDSCH related to the RMSI, even if the number of TRS transmission antenna ports is blind, Based on the channel values of the RMSI-related PDCCH or the PDSCH based on the channel values in each of the two subcarrier units in which the remaining OCC is received, Can be estimated.

25 and 26, the mini-slot is applicable to a structure including one or more OFDM symbols.

The extension application in the case where the PDSCH and / or the PDSCH related to the TRS and the RMSI are TDM in a structure in which the mini-slot is composed of two consecutive OFDM symbols will be described with reference to FIG.

FIG. 27 is a diagram illustrating a method of designing a TRS for channel estimation using a TRS TDM with a PDCCH or a PDSCH associated with an RMSI.

The design method of the TRS is applicable in the same way as in Fig. 25 or Fig. Since there is almost no channel change between consecutive OFDM symbols and the same beam is applied, the result of channel estimation using TRS can be utilized for RCSI-related PDCCH or PDSCH decoding.

The example is not limited to the PDCCH and / or PDSCH transmission related to RMSI, but it is a method of estimating the channel using the characteristic that the FDM or TDM reference signal and the channel are transmitted in the same direction beam. Do. The corresponding OCC values can be modified in any form if they are orthogonal to each other. It is possible to apply the OCC length extension according to the extension of the number of OFDM symbols transmitted through the same beam. Also, it is possible to extend the OCC length according to the mapping of the reference signal and the broadcast channel for the subcarriers in one OFDM symbol.

For example, as shown in FIG. 25 and FIG. 26, when the PDCCH or PDSCH related to the RMSI is a 2-port diversity mode transmission (ie 2 port SFBC), two ports PDCCH or PDSCH related to the RMSI is estimated based on the same OCC-based estimated channel values in each frequency resource. However, the RMSI-related PDCCH or PDSCH is designed to be a 4-port diversity mode (4 port In the case of diversity mode transmission (ie 4 port SFBC), each port of the PDCCH or PDSCH related to RMSI is divided into four ports by using OCC in each frequency resource and based on the same OCC- It is also possible to extend the scheme by designing to estimate a separate channel.

28 is a diagram illustrating a structure of a terminal according to an embodiment of the present invention.

Referring to FIG. 28, the terminal may include a transmission / reception unit 2810, a control unit 2820, and a storage unit 2830. In the present invention, the control unit may be defined as a circuit or an application specific integrated circuit or at least one processor. The processor may also be controlled by a program that includes instructions to perform the methods described in the embodiments of the present disclosure. The program may also be stored in a storage medium, which may include volatile or non-volatile memory. The memory may be a medium capable of storing data, and there is no restriction on the form when the instruction can be stored.

Transmitting / receiving unit 2810 can send and receive signals with other network entities. The transmission / reception unit 2810 can receive system information from, for example, a base station and can receive a synchronization signal or a reference signal.

The controller 2820 can control the overall operation of the terminal proposed by the present invention. In particular, the controller 2820 may control operations proposed by the present invention to receive residual system information (RMSI) in a multi-beam based system.

The storage unit 2830 may store at least one of information transmitted / received through the transmission / reception unit 2810 and information generated through the control unit 2820. For example, the storage unit 2830 may store scheduling information related to RMSI transmission, PDCCH time axis position and period information related to RMSI, and the like.

29 is a diagram illustrating a structure of a base station according to an embodiment of the present invention.

29, the base station may include a transmission / reception unit 2910, a control unit 2920, and a storage unit 2930. In the present invention, the control unit may be defined as a circuit or an application specific integrated circuit or at least one processor. The processor may also be controlled by a program that includes instructions to perform the methods described in the embodiments of the present disclosure. The program may also be stored in a storage medium, which may include volatile or non-volatile memory. The memory may be a medium capable of storing data, and there is no restriction on the form when the instruction can be stored.

The transceiver 2910 can send and receive signals with other network entities. The transmission / reception unit 2910 can transmit system information to the terminal, for example, and can transmit a synchronization signal or a reference signal.

The controller 2920 can control the overall operation of the base station proposed by the present invention. In particular, the controller 2920 may control operations proposed by the present invention to transmit residual system information (RMSI) in a multi-beam based system.

The storage unit 2930 may store at least one of information transmitted and received through the transceiver 2910 and information generated through the controller 2820. For example, the storage unit 2930 may store scheduling information related to RMSI transmission, PDCCH time axis position and period information related to RMSI, and the like.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. Accordingly, the scope of the present invention should be construed as being included in the scope of the present invention, all changes or modifications derived from the technical idea of the present invention.

Claims (16)

A method of a terminal in a wireless communication system,
Checking information on a plurality of control resource sets to which scheduling information on remaining system information is to be transmitted based on master block information (MIB) received from the base station;
Checking scheduling information in the control resource set; And
And receiving the residual system information using the scheduling information. The method according to claim 1,
Wherein the information about the plurality of sets of control resources includes:
And at least one of time position information, frequency position information, and QCL information of the control resource set. 3. The method of claim 2,
Wherein the step of verifying the scheduling information comprises:
When the QCL information is set,
And the scheduling information is confirmed in a control resource set corresponding to a transmission beam of a base station that transmitted the block among the plurality of control resource sets. 3. The method of claim 2,
Wherein the start point of the time axis for the plurality of control resource sets is predetermined if the time position information is not included in the information about the plurality of control resource sets. A method of a base station in a wireless communication system,
Transmitting master block information (MIB) including information on a plurality of sets of control resources to which scheduling information on remaining system information is to be transmitted;
Transmitting scheduling information in the control resource set; And
And transmitting the remaining system information using the scheduling information. 6. The method of claim 5,
Wherein the information about the plurality of sets of control resources includes:
And at least one of time position information, frequency position information, and QCL information of the control resource set. The method according to claim 6,
Wherein the step of transmitting the scheduling information comprises:
When setting the QCL information,
And transmits the scheduling information in a control resource set corresponding to a transmission beam of a base station that has transmitted the block among the plurality of control resource sets. The method according to claim 6,
Wherein the start point of the time axis for the plurality of control resource sets is predetermined if the time position information is not included in the information about the plurality of control resource sets. A terminal in a wireless communication system,
A transmitting and receiving unit for transmitting and receiving signals; And
The method includes verifying information on a plurality of control resource sets to which scheduling information on remaining system information is to be transmitted based on master block information (MIB) received from the base station, checking scheduling information in the control resource set, And a controller for receiving the remaining system information using the scheduling information. 10. The method of claim 9,
Wherein the information about the plurality of sets of control resources includes:
And at least one of time position information, frequency position information, and QCL information of the control resource set. 10. The method of claim 9,
Wherein,
When the QCL information is set,
And confirms the scheduling information in a control resource set corresponding to a transmission beam of a base station that transmitted the block among the plurality of control resource sets. 10. The method of claim 9,
Wherein the start point of the time axis for the plurality of control resource sets is predetermined if the time position information is not included in the information about the plurality of control resource sets. A base station in a wireless communication system,
A transmitting and receiving unit for transmitting and receiving signals; And
The method includes transmitting master block information (MIB) including information on a plurality of sets of control resources to which scheduling information on remaining system information is to be transmitted, transmitting scheduling information in the set of control resources, and using the scheduling information And transmitting the remaining system information to the base station. 14. The method of claim 13,
Wherein the information about the plurality of sets of control resources includes:
And at least one of time position information, frequency position information, and QCL information of the control resource set. 15. The method of claim 14,
Wherein,
When setting the QCL information,
And transmits the scheduling information in a control resource set corresponding to a transmission beam of a base station that transmitted the block among the plurality of control resource sets. 15. The method of claim 14,
Wherein the start point of the time axis for the plurality of control resource sets is predetermined if the time position information is not included in the information about the plurality of control resource sets.

Images