WO2018128440A1

WO2018128440A1 - Method for transmitting or receiving downlink control channel in next generation wireless network and apparatus therefor

Info

Publication number: WO2018128440A1
Application number: PCT/KR2018/000221
Authority: WO
Inventors: 박규진; 최우진
Original assignee: 주식회사 케이티
Priority date: 2017-01-06
Filing date: 2018-01-05
Publication date: 2018-07-12
Also published as: CN110024323A; CN110024323B

Abstract

The present embodiments relate to a method and an apparatus for transmitting or receiving a downlink control channel in a next generation/5G wireless access network. An embodiment provides a method for receiving a downlink control channel by a terminal, the method comprising the steps of: receiving configuration information relating to a common search space (CSS) from a base station; and receiving, through the common search space, a downlink control channel including information for scheduling remaining minimum system information (RMSI), wherein the configuration information is included in a master information block (MIB) received through a physical broadcast channel and is received from the base station.

Description

Method and apparatus for transmitting / receiving downlink control channel in next generation wireless network

The present embodiments relate to a method and apparatus for transmitting and receiving a downlink control channel (PDCCH) in a next generation / 5G wireless access network (hereinafter also referred to as "NR (New Radio)"), which has been discussed in 3GPP. In particular, a common search space (CSS) is configured to transmit cell-specific downlink control information (DCI) to a terminal through a downlink control channel, and downlink control is performed through the configured common search space. A method of transmitting and receiving a channel will be described.

3GPP recently approved a study item "Study on New Radio Access Technology" for the study of next generation / 5G radio access technology, and based on this, RAN WG1 has frame structure, channel coding and modulation for NR (New Radio) respectively. Discussions on waveforms and multiple access schemes are underway. NR is required to be designed to meet various requirements required for each segmented and detailed usage scenario as well as improved data rate in preparation for LTE / LTE-Advanced.

As representative usage scenarios for NR, enhancement Mobile BroadBand (eMBB), massive machine type communication (MMTC) and Ultra Reliable and Low Latency Communications (URLLC) have been raised, and LTE / LTE-Advanced preparation to meet the needs of each usage scenario. There is a need for a flexible frame structure design.

In the NR where such various usage scenarios exist, it is required to configure a resource of a downlink control channel in order to transmit and receive scheduling control information based on different time / frequency resources for each terminal.

In particular, it configures time and frequency resources for the Common Search Space (CSS) used to transmit cell-specific downlink control information (DCI) through a downlink control channel. There is a need to define a method. In addition, a method of setting a numerology of a downlink control channel (PDCCH) including information for scheduling remaining minimum system information (RMSI) transmitted through a common search space will be defined. There is a need.

An object of the present embodiments is to provide a specific scheme for transmitting and receiving a downlink control channel used for transmitting and receiving scheduling control information based on different time / frequency resources for each terminal in NR in which various usage scenarios exist. There is.

According to an aspect of the present invention, there is provided a method of receiving a downlink control channel (PDCCH) by a terminal, the method comprising: receiving configuration information on a common search space (CSS) from a base station; Receiving a downlink control channel (PDCCH) including information for scheduling remaining minimum system information (RMSI) through a common search space, wherein the configuration information includes a physical broadcast channel (PBCH) It is included in the Master Information Block (MIB) received through the method provides a method characterized in that it is received from the base station.

In addition, an embodiment of the present invention provides a method for transmitting a downlink control channel (PDCCH), the method comprising: setting configuration information for a common search space (CSS), transmitting configuration information to a terminal; Transmitting a downlink control channel (PDCCH) including information for scheduling remaining minimum system information (RMSI) through a common search space, wherein the configuration information includes a physical broadcast channel (PBCH); Provided is included in the Master Information Block (MIB) transmitted through the transmission to the terminal.

In addition, according to an embodiment, in a terminal receiving a downlink control channel (PDCCH), configuration information regarding a common search space (CSS) is received from a base station, and the remaining minimum system information (RMSI) is maintained. And a receiving unit for receiving a downlink control channel (PDCCH) including information for scheduling information through a common search space, wherein configuration information for the common search space is received through a MIB (Physical Broadcast Channel (PBCH)). Master Information Block) to provide a terminal characterized in that receiving from the base station.

In addition, according to an embodiment of the present invention, a base station transmitting a downlink control channel (PDCCH) includes: a control unit for setting configuration information on a common search space (CSS) and configuration information on a common search space to a terminal; And a transmitter for transmitting a downlink control channel (PDCCH) including information for scheduling remaining minimum system information (RMSI) through the common search space, wherein the configuration information for the common search space is included. Is provided in a MIB (Master Information Block) transmitted through a physical broadcast channel (PBCH) and provides a base station, characterized in that transmitted to the terminal.

According to the present embodiments, in an NR in which various usage scenarios exist, a specific scheme for transmitting and receiving a downlink control channel used for transmitting and receiving scheduling control information based on different time / frequency resources for each terminal may be provided. .

FIG. 1 is a diagram illustrating alignment of OFDM symbols when different subcarrier spacings are used.

2 is a diagram illustrating the concept of a bandwidth part (BWP).

3 is a diagram illustrating a procedure of receiving a downlink control channel by a terminal in this embodiment.

4 is a diagram illustrating a procedure for transmitting a downlink control channel by a base station in this embodiment.

5 is a diagram illustrating a configuration of a base station according to the present embodiments.

6 is a diagram illustrating a configuration of a user terminal according to the present embodiments.

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

In the present specification, the wireless communication system refers to a system for providing various communication services such as voice and packet data. The wireless communication system includes a user equipment (UE) and a base station (BS).

A user terminal is a comprehensive concept of a terminal in a wireless communication, and includes a user equipment (UE) in WCDMA, LTE, HSPA, and IMT-2020 (5G or New Radio), as well as a mobile station (MS) and a UT in GSM. It should be interpreted as a concept that includes a user terminal, a subscriber station (SS), and a wireless device.

A base station or cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, an eNB, a gNode-B, and a Low Power Node. ), Sector, site, various types of antennas, base transceiver system (BTS), access point, access point (for example, transmission point, reception point, transmission / reception point), relay node ( It is meant to encompass various coverage areas such as a relay node, a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, a remote radio head (RRH), a radio unit (RU), and a small cell.

Since the various cells listed above have a base station for controlling each cell, the base station may be interpreted in two meanings. 1) the device providing the mega cell, the macro cell, the micro cell, the pico cell, the femto cell, the small cell in relation to the wireless area, or 2) the wireless area itself. In 1) all devices that provide a given radio area are controlled by the same entity or interact with each other to cooperatively configure the radio area to the base station. According to the configuration of the wireless area, a point, a transmission point, a transmission point, a reception point, and the like become one embodiment of a base station. In 2), the base station may indicate the radio area itself that receives or transmits a signal from the viewpoint of the user terminal or the position of a neighboring base station.

In the present specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.

In the present specification, the user terminal and the base station are used in a comprehensive sense as two entities (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by the terms or words specifically referred to. Do not.

Here, the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal, the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.

The uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, and use a frequency division duplex (FDD) scheme, a TDD scheme, and an FDD scheme, which are transmitted using different frequencies. Mixed mode may be used.

In addition, in a wireless communication system, a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers.

The uplink and the downlink transmit control information through a control channel such as a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), and the like. It is composed of the same data channel to transmit data.

Downlink (downlink) may mean a communication or communication path from the multiple transmission and reception points to the terminal, uplink (uplink) may mean a communication or communication path from the terminal to the multiple transmission and reception points. In this case, in the downlink, the transmitter may be part of multiple transmission / reception points, and the receiver may be part of the terminal. In addition, in uplink, a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, and a PDSCH may be described in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, and a PDSCH.'

Meanwhile, high layer signaling described below includes RRC signaling for transmitting RRC information including an RRC parameter.

The base station performs downlink transmission to the terminals. The base station transmits downlink control information such as scheduling required for reception of a downlink data channel, which is a main physical channel for unicast transmission, and a physical downlink for transmitting scheduling grant information for transmission on an uplink data channel. The control channel can be transmitted. Hereinafter, the transmission and reception of signals through each channel will be described in the form of transmission and reception of the corresponding channel.

There is no limitation on the multiple access scheme applied in the wireless communication system. Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Code Division Multiple Access (CDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Non-Orthogonal Multiple Access (NOMA), OFDM-TDMA, OFDM-FDMA, Various multiple access techniques such as OFDM-CDMA can be used. Here, the NOMA includes a sparse code multiple access (SCMA) and a low density spreading (LDS).

One embodiment of the present invention is for asynchronous radio communication evolving to LTE / LTE-Advanced, IMT-2020 via GSM, WCDMA, HSPA, and synchronous radio communication evolving to CDMA, CDMA-2000 and UMB. Can be applied.

In the present specification, a MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. Alternatively, in the present specification, the MTC terminal may mean a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.

In other words, in the present specification, the MTC terminal may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC related operations. Alternatively, in the present specification, the MTC terminal supports enhanced coverage compared to the existing LTE coverage, or UE category / type defined in the existing 3GPP Release-12 or lower, or newly defined Release-13 low cost (or supporting low power consumption). low complexity) can mean UE category / type. Or, it may mean a further Enhanced MTC terminal defined in Release-14.

In this specification, a NB-IoT (NarrowBand Internet of Things) terminal refers to a terminal that supports radio access for cellular IoT. The objectives of NB-IoT technology include improved Indoor coverage, support for large scale low speed terminals, low sensitivity, low cost terminal cost, low power consumption, and optimized network architecture.

As a typical usage scenario in New Radio (NR), which is recently discussed by 3GPP, enhanced Mobile BroadBand (eMBB), massive machine type communication (MMTC), and Ultra Reliable and Low Latency Communication (URLLC) are being raised.

In this specification, frequencies, frames, subframes, resources, resource blocks, regions, bands, subbands, control channels, data channels, synchronization signals, various reference signals, various signals, and various messages related to NR (New Radio). May be interpreted as meaning used in the past or present, or various meanings used in the future.

NR(New Radio)NR (New Radio)

3GPP recently approved a study item "Study on New Radio Access Technology" for the study of next-generation / 5G radio access technologies, and based on this, frame structure, channel coding and modulation, waveform and Discussions on multiple access schemes (frame structure, channel coding & modulation, waveform & multiple access scheme) have begun.

The NR is required to be designed to meet various requirements required for each detailed and detailed usage scenario as well as an improved data rate compared to LTE / LTE-Advanced. In particular, as a typical usage scenario for NR, enhancement Mobile BroadBand (eMBB), massive MTC (MMTC), and Ultra Reliable and Low Latency Communications (URLLC) were raised, and requirements for each usage scenario were identified. As a method for satisfying the requirements, a flexible frame structure design has been required in comparison to LTE / LTE-Advanced.

Specifically, eMBB, mMTC and URLLC are considered as a typical usage scenario of NR under discussion in 3GPP. Each usage scenario has different requirements for data rates, latency, coverage, and so on, so each usage scenario uses frequency bands that make up any NR system. Effectively multiplexing radio resource units based on different numerology (eg subcarrier spacing, subframe, TTI, etc.) as a method for efficiently satisfying requirements for each scenario. There is a need for a method of multiplexing.

As one method for this, multiplexing based on TDM, FDM or TDM / FDM through a single NR carrier for numerology having different subcarrier spacing (SCS) values There has been discussion of methods and methods for supporting one or more time units in constructing scheduling units in the time domain. In this regard, in NR, a subframe is defined as a kind of time domain structure, and reference numerology is used to define a subframe duration. As the LTE, it was decided to define a single subframe duration consisting of 14 OFDM symbols of the same 15kHz sub-carrier spacing (SCS) based normal CP overhead. Accordingly, in NR, the subframe has a time duration of 1 ms. However, unlike LTE, subframes of NR are absolute reference time durations, and slots and mini-slots are time units based on actual uplink / downlink data scheduling. ) Can be defined. In this case, the number of OFDM symbols and the y value constituting the slot are determined to have a value of y = 14 regardless of the neuralology.

Accordingly, any slot may consist of 14 symbols, and all symbols may be used for DL transmission or all symbols may be uplink transmission according to the transmission direction of the slot. It may be used for UL transmission, or in the form of a DL portion + gap + uplink portion (UL portion).

In addition, a short slot time-domain scheduling interval for transmitting / receiving up / down link data is defined based on a mini-slot consisting of fewer symbols than a corresponding slot in a random number (numerology) (or SCS). A scheduling interval may be set or a long time-domain scheduling interval for transmitting and receiving uplink / downlink data through slot aggregation may be configured.

In particular, in case of transmission / reception of delay critical data such as URLLC, slots based on 0.5 ms (7 symbols) or 1 ms (14 symbols) defined in a neuralology-based frame structure having a small SCS value such as 15 kHz If the scheduling is performed in units, it may be difficult to satisfy the latency requirement, so for this purpose, a mini-slot consisting of fewer OFDM symbols than the corresponding slot is defined and the corresponding URLLC is used based on this. It may be defined that scheduling for delay critical data such as is performed.

Alternatively, as described above, by supporting multiplexers with different SCS values in one NR carrier by TDM or FDM, based on slot (or mini-slot) lengths defined for each neuron. Scheduling data according to latency requirements is also being considered. For example, as shown in FIG. 1, when the SCS is 60 kHz, since the symbol length is reduced by about 1/4 compared to the case of the SCS 15 kHz, when the same slot is configured with 7 OFDM symbols, the slot length based on the 15 kHz is While 0.5 ms, the slot length based on 60 kHz is reduced to about 0.125 ms.

As described above, the NR discusses how to satisfy the requirements of URLLC and eMBB by defining different SCSs or different TTI lengths.

더 넓은 대역폭 동작(Wider bandwidth operations)Wider bandwidth operations

In the existing LTE system, scalable bandwidth operation was supported for an arbitrary component carrier (CC). That is, according to the frequency deployment scenario (deployment scenario), when any LTE operator configures one LTE CC, a minimum bandwidth of 1.4 MHz to 20 MHz could be configured. Accordingly, any general LTE terminal supported transmit / receive capacity for a bandwidth of 20 MHz for one LTE CC.

However, in the case of NR, a design is made to support NR terminals having different transmit / receive bandwidth capabilities in one NR CC. Accordingly, as shown in FIG. 2, one or more bandwidth parts (BWPs) configured with bandwidths segmented for any NR CC may be configured. In addition, support for flexible wider bandwidth operation is required by configuring and activating different bandwidth parts for each terminal.

Referring to FIG. 2, a bandwidth part that is a part of the entire bandwidth of one NR CC may be defined, and each terminal may activate and use any bandwidth part of the configured N bandwidth parts.

As such, any NR CC may be divided into one or more bandwidth parts, and thus, one or more bandwidth parts may be configured for each UE. And activating one or more bandwidth parts among one or more bandwidth parts configured for any terminal, and using the activated bandwidth part, the uplink / downlink radio signal and the radio for the corresponding terminal. It may be defined that transmission and reception on a channel is performed.

In addition, when a plurality of numerologies are supported in any NR CC, different numerology for transmitting and receiving uplink / downlink radio signals and radio channels for each bandwidth part is different. Can be set.

As described above, in order to support URLLC service in NR, it is necessary to support a short scheduling unit (or TTI, Transmission Time Interval) that can satisfy a latency boundary in the time domain. have. On the other hand, in the case of eMBB or mMTC, applying a longer time period resource allocation unit in comparison to URLLC in defining a scheduling unit in the time domain has control overhead and coverage. It can be efficient in terms of coverage.

As a way to simultaneously satisfy the usage scenarios of various NRs, the pneumatics of subcarrier spacing (e.g. large subcarrier spacing such as 60 kHz, 120 kHz, etc.) can be easily defined in order to define short time interval resource allocation units suitable for URLLC. Mixed numerology method that supports the numerology of roller paper and subcarrier spacing (eg 15 kHz for eMBB or 3.75 kHz for mMTC) suitable for eMBB and mMTC through one NR carrier This is possible.

Or simultaneously support time-domain scheduling units of different lengths, such as subframes or slots or mini-slots, within an NR carrier operating with any particular numerology. have.

In the present embodiment, a resource of a downlink control channel for transmitting and receiving scheduling control information based on different time-domain scheduling units for each terminal in NR considering various usage scenarios as described above is set. It describes a method and a method for monitoring the downlink control channel of the terminal.

In particular, a method of defining a common search space (CSS) used for transmitting cell-specific downlink control information (DCI) through a downlink control channel is proposed.

However, the CSS setting method proposed in this embodiment may be specifically interpreted as a method of setting a control resource set (CORESET, Control Resource Set) including the corresponding CSS.

In addition, the cell-specific DCI included in the PDCCH transmitted through the CSS configured in the corresponding CORESET is i) scheduling control information for the remaining minimum system information (RMSI), ii) cell-specific (cell-specific) TPC (Transmit Power Control) related configuration information, iii) scheduling control information for the paging (paging) message, iv) scheduling control information for the random access response (RAR).

Hereinafter, a specific method related to CSS setting will be described for convenience of description, but this may be interpreted as a method of setting a CORESET in which the CSS is configured.

Embodiments described below may be applied to a terminal, a base station, and a core network entity (MME) using all mobile communication technologies. For example, the present embodiments can be applied not only to mobile communication terminals to which LTE technology is applied but also to next generation mobile communication (5G mobile communication, New-RAT) terminals, base stations, and core network entities (AMFs). For convenience of description, the base station may refer to an eNB of LTE / E-UTRAN, and a base station (CU, DU, or CU and DU) may be represented in a 5G wireless network in which a central unit (CU) and a distributed unit (DU) are separated. An entity implemented as one logical entity), gNB.

In addition, the numerology (numerology) described herein refers to the numerical characteristics and meaning of the numerical value for data transmission and reception, and may be determined by the value of subcarrier spacing (hereinafter also referred to as SCS or Subcarrier Spacing). . Therefore, different numerology (numerology) may mean that the subcarrier spacing that determines the numerology (numerology) is different.

In the present specification, the slot length may be represented by the number of OFDM symbols constituting the slot, or may be represented by the time occupied by the slot. For example, when a numerology based on SCS of 15 kHz is used, the length of one slot may be represented by 14 OFDM symbols and may be represented by 1 ms.

The remaining minimum system information (RMSI) may also be referred to as SIB1 since the remaining minimum system information (RMSI) may be transmitted to the UE as SIB1 as part of the system information. The system information transmitted to the terminal through another SIB other than SIB1 may be referred to as other system information (OSI).

Referring to FIG. 3, the terminal may receive configuration information on a common search space (CSS) from the base station (S300).

In this case, configuration information on the common search space may be included in a master information block (MIB) received through a physical broadcast channel (PBCH). That is, the base station may broadcast a master information block (MIB) to terminals in a cell through the PBCH, and may include configuration information about a common search space in the MIB.

An example of the information included in the configuration information may be subcarrier spacing (SCS) information for the downlink control channel transmitted to the terminal through the common search space.

As described above, in the NR CC / cell, a plurality of numerologies may be set, and the numerology used for transmission of the PDCCH may be different. Therefore, the configuration information for the common search space may include pneumatic configuration information for the PDCCH. As described above, since the neuralology may vary according to the subcarrier spacing value, the configuration information for the common search space may include the subcarrier spacing information.

As another example of the information included in the configuration information, time resource allocation information and frequency resource allocation information for the common search space may be included.

In this case, the time resource allocation information may be information about a period of the common search space. The period may be defined as a fixed value irrespective of the subcarrier spacing value or the slot length, may be defined as a function of the subcarrier spacing value, and the subcarrier spacing value and slot used for transmission of the PSS / SSS or PBCH. It may be set by the length.

In this case, the frequency resources allocated by the frequency resource allocation information may be allocated to one or more consecutive physical resource blocks (PRBs). That is, the frequency resource allocation information may include information about a group of consecutive PRBs forming a common search space.

In addition, the UE may receive a downlink control channel (PDCCH) including information for scheduling remaining minimum system information (RMSI) through the aforementioned common search space (S310).

The terminal may receive the downlink control channel through the common search space based on the configuration information on the common search space received in step S300.

The downlink control channel received through the common search space may include cell-specific downlink control information (cell-specific DCI) common to all terminals in a cell. In this case, as an example of the information included in the cell-specific downlink control information, there is information for scheduling the remaining minimum system information (RMSI), that is, scheduling control information for the RMSI.

Referring to FIG. 4, the base station may set configuration information about a common search space (CSS) (S400).

As described above, in the NR CC / cell, a plurality of numerologies may be set, and the numerologies used for transmission of the PDCCH may be different from each other. Therefore, the configuration information for the common search space may include pneumatic configuration information for the PDCCH. As described above, since the neuralology may vary according to the subcarrier spacing value, the configuration information for the common search space may include the subcarrier spacing information.

In this case, the frequency resources allocated by the frequency resource allocation information may be allocated to one or more consecutive physical resource blocks (PRBs). The frequency resource allocation information may include information about a group of consecutive PRBs forming a common search space.

In addition, the base station may transmit configuration information on the aforementioned common search space (CSS) to the terminal (S410).

In this case, configuration information regarding the common search space may be included in a master information block (MIB) received through a physical broadcast channel (PBCH) as described above with reference to FIG. 3. That is, when the base station broadcasts a master information block (MIB) to a terminal in a cell through a PBCH, the base station may include configuration information about a common search space in the MIB.

In addition, the base station may transmit a downlink control channel (PDCCH) including information for scheduling remaining minimum system information (RMSI) through the common search space (S420).

The base station may transmit the downlink control channel to the terminal through the common search space based on the configuration information for the common search space set in step S400.

In this case, as described above with reference to FIG. 3, the downlink control channel received through the common search space may include cell-specific downlink control information (cell-specific DCI) common to all terminals in the cell. In this case, as an example of the information included in the cell-specific downlink control information, there is information for scheduling the remaining minimum system information (RMSI), that is, scheduling control information for the RMSI.

Hereinafter, various embodiments of the method for configuring the downlink control channel by the aforementioned terminal and the base station will be described in detail.

The embodiments described below can be applied individually or in any combination.

실시예 1. CSS 주기 설정Example 1 CSS Period Setting

In the first embodiment, a method of setting resources on a time-domain axis for the above-described CSS or CORESET configured with CSS will be described. In more detail, setting information on a time duration resource for a corresponding CSS in a certain NR CC (Cell Carrier) / cell may be setting information about a cycle in which the corresponding CSS is configured.

As described above, in NR, it is required to support multiple numerologies based on different SCSs. Accordingly, in NR, data scheduling based on different SCS-based frame structures and corresponding slot lengths may be performed according to frequency bands or usage scenarios in which the corresponding NR cells are configured.

As such, in multiple numerology-based NRs, the CSS period may be set to have any fixed period regardless of the value of the SCS and the corresponding slot length. As an example, in NR, CSS may be defined to be set in the aforementioned subframe unit, that is, 1 ms unit.

Alternatively, as another method of setting a period of CSS in NR, the period of the CSS may be set as a function of the SCS value. That is, the corresponding CSS period may vary according to the SCS value constituting a cell of any NR. At this time, the period of the CSS may be defined as a function of the SCS value or may be defined as a function of the slot length set in the corresponding NR cell.

As an example, CSS may be set in a slot unit defined in a corresponding NR cell. However, when a plurality of SCSs are supported in any NR cell, the corresponding CSS may be configured based on the SCS through which the PSS / SSS or the PBCH is transmitted and the corresponding slot length. Alternatively, separate CSS may be set according to each SCS and slot length.

As another example, the base station or the network may set the period of the corresponding CSS, and may be transmitted to the terminal through cell-specific RRC signaling such as MIB or SIB.

For example, the CSS-related period setting information may be included in the MIB transmitted through the PBCH. The period-related configuration information includes: i) transmission configuration information of CSS based on slot numerology configuration and slot length, and ii) radio frame or subframe. Period setting information in units of frames, iii) a slot index (indices) or subframe index (indices) in which CSS is configured in a corresponding radio frame in units of one or more radio frames )) May be related information.

실시예 2. CSS 서브대역(sub-band) 설정Example 2 CSS sub-band setting

In Embodiment 2, a method of setting resources on a frequency-domain axis for the above-described CSS or CORESET configured with CSS will be described. In more detail, allocation information on frequency interval resources for a corresponding CSS in an arbitrary NR CC / cell may include a subband including a group of consecutive physical resource blocks (PRBs) including the corresponding CSS. sub-band-related allocation information or bandwidth part-related allocation information.

As described above, when CSS is configured in units of subframes or slots, a method for defining a group of PRBs, ie, sub-bands, for composing CSS in the corresponding subframe or slot is as follows.

The group of PRBs may be defined in the form of a function taking as arguments the physical cell ID (PCI), subframe or slot index of the cell, the system bandwidth of the cell (number of PRBs), and the SCS value. Can be defined as the form of a function with some arguments.

Alternatively, the base station may set whether to apply the above factors, and may transmit the same to the terminal through cell-specific RRC signaling such as MIB or SIB. And the terminal may configure a sub-band (sub-band) for the CSS based on this.

For example, whether the base station applies CSS sub-band hopping on a subframe or slot basis through cell-specific RRC signaling such as MIB or SIB. Can be set.

Accordingly, CSS sub-bands defined in units of each subframe or slot may be defined to be the same as each other or to be hopped according to the corresponding subframe or slot index.

In addition, frequency resource allocation information for configuring CSS in a base station or network may be directly set, and may be defined to be transmitted through cell-specific RRC signaling such as MIB or SIB.

For example, the frequency resource allocation information for configuring the CSS may be defined to be included in the MIB and transmitted through the PBCH. In this case, the frequency resource allocation information may be bandwidth part allocation information in which CSS is configured or allocation information of a PRB in the bandwidth part.

Alternatively, the frequency resource for which the CSS is configured may be limited to the frequency band in which the SS block is transmitted in the corresponding NR CC / cell. For example, the CSS may be configured through a bandwidth through which PSS / SSS or PBCH transmission is performed. In more detail, the CSS may be configured to be configured through the same PRB as the PRB to which the PSS / SSS or PBCH is transmitted, or the CSS may be configured through a bandwidth part including the PSS / SSS or PBCH. You may.

실시예 3. PDCCH에 대한 전송 뉴머롤러지 설정Example 3 Transmission Numerical Configuration for PDCCH

In Embodiment 3, a method for establishing transmission numerology for a downlink control channel (PDCCH) including a cell-specific DCI transmitted through a CSS or a CORESET configured with CSS is described. Explain about.

As described above, when a plurality of numerologies are supported in any NR cell, separate CSSs may be defined for each numerology. In addition, only CSS based on reference numerology, that is, PSN / SSS or PBCH transmission, that is, single numerology-based CSS may be defined.

On the other hand, after setting the transmission numerology (transmission numerology) of the CSS in the base station or the network may be transmitted to the terminal through cell-specific RRC signaling (cell-specific RRC signaling, such as MIB or SIB).

For example, transmission numerology related configuration information (e.g. SCS or CP (Cyclic Prefix) length related configuration information, etc.) of the CSS may be defined to be included in the MIB transmitted through the PBCH.

In addition, in NR, as a method of setting CSS for an arbitrary terminal, a CORESET setting in which a plurality of CSSs or CSSs are configured for each purpose / use of each CSS may be defined.

Specifically, i) CSS for transmitting PDCCH including scheduling control information for RMSI, ii) other system information, that is, scheduling control information for MIB and other system information except RMSI transmitted through PBCH. CSS for transmitting a PDCCH, iii) CSS for transmitting scheduling control information for a random access response (RAR), iv) CSS for transmitting scheduling control information for a paging message, v) configuration for each terminal CSS for fallback operation for the UE-specific Search Space (USS), vi) TPC command, and other multicast / broadcast control information such as CSS for transmitting purpose / purpose. Accordingly, separate CSSs may be defined. However, a single CSS may be defined to be shared for a plurality of specific purposes / uses.

As described above, when a plurality of CSSs are defined, each CSS setting may be hierarchical. That is, the respective CSS configuration information described in the first, second, and third embodiments described above may be sequentially performed through the MIB, the RMSI, and the like.

For example, CSS setting information for RMSI is transmitted through MIB transmitted through PBCH, and CSS setting information for paging, RAR, etc. for CSS or other system information is transmitted through RMSI. Can be sent. However, all cases where a plurality of CSSs are defined according to a purpose and a purpose, and each CSS-related setting is hierarchical may be included in the scope of the present embodiment.

Referring to FIG. 5, the base station 500 includes a controller 510, a transmitter 520, and a receiver 530.

The controller 510 controls the overall operation of the base station according to the base station required to perform the above-described embodiment transmits the downlink control channel.

In more detail, the controller may set configuration information about a common search space (CSS).

As described above, in the NR cell, a plurality of numerologies may be set, and the numerology used for transmission of the PDCCH may be different from each other. Therefore, the configuration information for the common search space may include pneumatic configuration information for the PDCCH. As described above, since the neuralology may vary according to the subcarrier spacing value, the configuration information for the common search space may include the subcarrier spacing information.

The transmitter 520 and the receiver 530 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention.

In more detail, the transmitter 520 transmits configuration information on a common search space to a terminal and common search for a downlink control channel (PDCCH) including information for scheduling remaining minimum system information (RMSI). You can transmit through space.

At this time, the configuration information for the common search space may be included in the MIB (Master Information Block) transmitted through the physical broadcast channel (PBCH) as described above in FIG. 4 and transmitted to the terminal.

In addition, the base station may transmit the downlink control channel to the terminal through the common search space based on the configuration information for the common search space.

In this case, as described above, the downlink control channel received through the common search space may include cell-specific downlink control information (cell-specific DCI) common to all terminals in the cell. In this case, as an example of the information included in the cell-specific downlink control information, there is information for scheduling the remaining minimum system information (RMSI), that is, scheduling control information for the RMSI.

Referring to FIG. 6, the user terminal 600 includes a receiver 610, a controller 620, and a transmitter 630.

The receiver 610 receives downlink control information, data, and a message from a base station through a corresponding channel.

In detail, the receiver 610 may receive configuration information about a common search space (CSS) from a base station.

In this case, configuration information on the common search space may be included in a master information block (MIB) received through a physical broadcast channel (PBCH). That is, when the base station broadcasts a master information block (MIB) to a terminal in a cell through a PBCH, the base station may include configuration information about a common search space in the MIB.

As described above, in the NR cell, a plurality of numerologies may be set, and the numerology used for transmission of the PDCCH may be different. Therefore, the configuration information for the common search space may include pneumatic configuration information for the PDCCH. As described above, since the neuralology may vary according to the subcarrier spacing value, the configuration information for the common search space may include the subcarrier spacing information.

The receiver 610 may receive a downlink control channel (PDCCH) including information for scheduling remaining minimum system information (RMSI) through a common search space.

In addition, the controller 620 controls the overall operation of the user terminal 600 according to receiving the downlink control channel (PDCCH) necessary to perform the above-described embodiment.

The standard contents or standard documents mentioned in the above embodiments are omitted to simplify the description of the specification and form a part of the present specification. Therefore, the addition of the contents of the standard and part of the standard documents to the specification or the description in the claims should be construed as falling within the scope of the present invention.

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

CROSS-REFERENCE TO RELATED APPLICATIONCROSS-REFERENCE TO RELATED APPLICATION

This patent application is filed with the Korean Patent Application No. 10-2017-0002589 filed in Korea on January 06, 2017 and the Patent Application No. 10-2017-0066632 filed in Korea on May 30, 2017 and January 2018. Patent Application No. 10-2018-0001157, filed with Korea on April 04, claims priority under the U.S. Patent Act Article 119 (a) (35 USC § 119 (a)), all of which are hereby incorporated by reference. Incorporated into the application. In addition, if this patent application claims priority for the same reason for countries other than the United States, all its contents are incorporated into this patent application by reference.

Claims

In a method of receiving a downlink control channel (PDCCH) by the terminal,

Receiving configuration information on a common search space (CSS) from a base station; And

Receiving a downlink control channel (PDCCH) including information for scheduling the remaining minimum system information (RMSI) through the common search space,

The configuration information,

Method included in the master information block (MIB) received via a physical broadcast channel (PBCH) received from the base station.
The method of claim 1,

The configuration information,

And subcarrier spacing (SCS) information for the downlink control channel.
The method of claim 1,

The configuration information,

And time resource allocation information and frequency resource allocation information for the common search space.
The method of claim 3, wherein

The time resource allocation information,

And information about a period of the common search space.
The method of claim 3, wherein

Frequency resource for the common search space,

And at least one contiguous physical resource block (PRB).
In the base station transmits a downlink control channel (PDCCH),

Setting configuration information about a common search space (CSS);

Transmitting the configuration information to a terminal; And

Transmitting a downlink control channel (PDCCH) including information for scheduling remaining minimum system information (RMSI) through the common search space,

The configuration information,

And included in a master information block (MIB) transmitted through a physical broadcast channel (PBCH) and transmitted to the terminal.
The method of claim 6,

The configuration information,

And subcarrier spacing (SCS) information for the downlink control channel.
The method of claim 6,

The configuration information,

And time resource allocation information and frequency resource allocation information for the common search space.
The method of claim 8,

The time resource allocation information,

And information about a period of the common search space.
The method of claim 8,

Frequency resource for the common search space,

And at least one contiguous physical resource block (PRB).
In a terminal receiving a downlink control channel (PDCCH),

Receive configuration information on a common search space (CSS) from a base station, and common downlink control channel (PDCCH) including information for scheduling the remaining minimum system information (RMSI) Including a receiver receiving through the search space,

The configuration information,

Terminal included in the MIB (Master Information Block) received through a physical broadcast channel (PBCH) and received from the base station.
The method of claim 11,

The configuration information,

And a subcarrier spacing (SCS) information for the downlink control channel.
The method of claim 11,

The configuration information,

And a time resource allocation information and a frequency resource allocation information for the common search space.
The method of claim 13,

The time resource allocation information,

Terminal for the period of the common search space.
The method of claim 13,

Frequency resource for the common search space,

Terminal, characterized in that allocated to one or more consecutive physical resource blocks (PRB, Physical Resource Block).
A base station transmitting a downlink control channel (PDCCH),

A controller configured to set configuration information about a common search space (CSS); And

And a transmitter for transmitting the configuration information to a terminal and transmitting a downlink control channel (PDCCH) including information for scheduling remaining minimum system information (RMSI) through the common search space.

The configuration information,

And a base station included in a master information block (MIB) transmitted through a physical broadcast channel (PBCH) and transmitted to the terminal.
The method of claim 16,

The configuration information,

And base carrier spacing (SCS) information for the downlink control channel.
The method of claim 16,

The configuration information,

And a base resource allocation information and a frequency resource allocation information for the common search space.
The method of claim 18,

The time resource allocation information,

And base station information on the period of the common search space.
The method of claim 18,

Frequency resource for the common search space,

A base station characterized by being assigned to one or more consecutive physical resource blocks (PRBs).