WO2019221567A1 - Uplink/downlink configuration information transmission and reception method in wireless communication system and communication device using said method - Google Patents

Abstract

Provided is an uplink/downlink configuration information reception method performed by means of a terminal in a wireless communication system. The method is characterized by performing SSB measurement for a plurality of SSBs which have different beam directions and transmitting SSB measurement information to a network, wherein the SSB measurement information shows a best SSB selected by the terminal on the basis of the SSB measurement among the plurality of SSBs, and the uplink/downlink configuration information is received from the network, wherein the uplink/downlink configuration information is group-common and the group is a set of terminals having the same best SSB.

Description

Method for transmitting / receiving uplink / downlink configuration information in a wireless communication system and a communication device using the method

The present invention relates to wireless communication, and more particularly, to a method for transmitting / receiving uplink / downlink configuration information in a wireless communication system and a communication apparatus using the method.

As more communication devices demand larger communication capacities, there is a need for improved mobile broadband communication as compared to conventional radio access technology (RAT). Massive Machine Type Communications (MTC), which connects multiple devices and objects to provide various services anytime and anywhere, is also one of the major issues to be considered in next-generation communication. In addition, communication system design considering services / terminals that are sensitive to reliability and latency has been discussed. The introduction of next-generation wireless access technologies in consideration of such extended mobile broadband communication, massive MTC, Ultra-Reliable and Low Latency Communication (URLLC), and the like are discussed in the present invention for convenience. Is called new RAT or NR.

In the NR system, it is preferable to perform dynamic UL / DL configuration rather than LTE, and a method of maximizing resource utilization is required by enabling a plurality of UL / DL configurations in a cell. The present invention proposes a method of grouping terminals in a cell, a method of changing a group, and an operation method of each entity (network and / or terminal) for smoothly performing operations for each group. In other words, we propose a measurement and grouping method for grouping terminals in a cell for flexible UL / DL configuration.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a method for transmitting / receiving uplink / downlink configuration information in a wireless communication system and a communication device using the method.

In one aspect, a method for receiving uplink (UL) / downlink (DL) configuration information performed by a terminal in a wireless communication system is provided. The method may perform SSB measurement on a plurality of synchronization signal blocks (SSBs) having different beam directions, and transmit SSB measurement information to a network, wherein the SSB measurement information is determined by the terminal. Informing the best SSB selected based on the SSB measurement among the plurality of SSBs, and receiving the UL / DL configuration information from the network, wherein the UL / DL configuration information is group-common, The group is characterized in that the best SSB is a set of identical terminals.

The terminal receives the UL / DL configuration information based on a control resource set (CORESET) and a search space (SS) set, wherein at least one of the CORESET and the SS set is group-common. Can be set.

The CORESET and the SS set may each be set group-commonly.

The terminal receives control resource configuration information, the control resource configuration information informs the setting of the CORESET per group and the SS set per group, the terminal is a group to which the terminal belongs based on the control resource configuration information Monitoring can be performed for groups other than this.

The control resource configuration information may be transmitted through radio resource control (RRC) signaling.

The monitoring may be performed for a group having the largest interference with the terminal.

The terminal further performs uplink measurement for uplink transmission of another terminal, and the terminal further includes transmitting uplink measurement information for the uplink measurement to a network, wherein the UL / DL configuration information is the SSB It may be determined by the network based on the measurement information and the uplink measurement information.

The uplink transmission may be performed based on a specific frequency band allocated per terminal in a specific time interval.

The SSB measurement may be performed on at least one of a serving cell of the terminal and a neighbor cell of the serving cell.

In another aspect, there is provided a method for transmitting uplink (UL) / downlink (DL) configuration information performed by a base station in a wireless communication system. The method may include transmitting a plurality of synchronization signal blocks (SSBs) having different beam directions and receiving SSB measurement information from a terminal, wherein the SSB measurement information is determined by the terminal among the plurality of SSBs. Includes information on the selected best synchronization signal block (SSB), and transmits UL / DL configuration information to the terminal based on the SSB measurement information, the UL / DL configuration information Group-common, wherein the group is characterized in that the best SSB is a set of identical terminals.

The base station transmits the UL / DL configuration information based on a control resource set (CORESET) and a search space (SS) set, wherein at least one of the CORESET and the SS set is group-common. Can be set.

The base station transmits control resource configuration information to another base station, wherein the control resource configuration information informs the setting of the CORESET per group and the SS set per group, and the control resource configuration information is between the base station and the other base station. It can be transmitted over the air interface.

The base station transmits group information to another base station, and the group information may include information on groups controlled by the base station.

In another aspect, a user equipment (UE) includes a transceiver for transmitting and receiving a radio signal and a processor operating in combination with the transceiver, wherein the processor has different beam directions. Perform SSB measurement on a plurality of synchronization signal blocks (SSBs), and transmit SSB measurement information to a network, wherein the SSB measurement information is based on the SSB measurement of the SSBs by the terminal. Inform the selected best SSB and receive the UL / DL configuration information from the network, wherein the UL / DL configuration information is group-common, and the group is a set of terminals with the same best SSB. It is characterized by that.

The terminal may be a terminal that communicates with at least one of a mobile terminal, the network, and an autonomous vehicle other than the terminal.

According to the present invention, in an NR system requiring more flexible transmission direction control, a method of grouping terminals in a cell for flexible UL / DL configuration and a related measurement method are proposed.

1 illustrates a wireless communication system to which the present invention can be applied.

FIG. 2 is a block diagram illustrating a radio protocol architecture for a user plane.

3 is a block diagram illustrating a radio protocol structure for a control plane.

4 illustrates a system structure of a new generation radio access network (NG-RAN) to which NR is applied.

5 illustrates the functional division between NG-RAN and 5GC.

6 illustrates a frame structure that can be applied in the NR.

7 illustrates CORESET.

8 is a diagram showing a difference between a conventional control region and a CORESET in the NR.

9 shows an example of a frame structure for a new radio access technology.

10 schematically illustrates a hybrid beamforming structure in terms of TXRU and physical antenna.

FIG. 11 is a diagram illustrating the beam sweeping operation with respect to a synchronization signal and system information in a downlink (DL) transmission process.

12 shows an example of a method of designating an uplink transmission entity for each subband.

13 shows an example of subband uplink transmission on a cell basis.

14 is a flowchart illustrating a method of receiving UL / DL configuration information performed by a terminal according to an embodiment of the present invention.

15 schematically illustrates an example in which an embodiment of the present invention is implemented.

16 shows an example of a case where a plurality of terminal groups are defined in each cell.

17 schematically illustrates an example to which the present invention is applied.

18 illustrates a wireless communication device according to an embodiment of the present invention.

19 is a block diagram illustrating components of a transmitting apparatus and a receiving apparatus that perform the present invention.

20 illustrates an example of a signal processing module structure in a transmission device.

21 shows another example of a signal processing module structure in a transmission device.

22 illustrates an example of a wireless communication device according to an embodiment of the present invention.

23 shows an example of a 5G usage scenario to which the technical features of the present invention can be applied.

1 illustrates a wireless communication system to which the present invention can be applied. This may also be called an Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN), or Long Term Evolution (LTE) / LTE-A system.

The E-UTRAN includes a base station (BS) 20 that provides a control plane and a user plane to a user equipment (UE) 10. The terminal 10 may be fixed or mobile and may be called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device (Wireless Device), and the like. . The base station 20 refers to a fixed station communicating with the terminal 10, and may be referred to by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like.

The base stations 20 may be connected to each other through an X2 interface. The base station 20 is connected to a Serving Gateway (S-GW) through an MME (Mobility Management Entity) and an S1-U through an Evolved Packet Core (EPC) 30, more specifically, an S1-MME through an S1 interface.

EPC 30 is composed of MME, S-GW and P-GW (Packet Data Network-Gateway). The MME has information about the access information of the terminal or the capability of the terminal, and this information is mainly used for mobility management of the terminal. S-GW is a gateway having an E-UTRAN as an endpoint, and P-GW is a gateway having a PDN as an endpoint.

Layers of the Radio Interface Protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems. L2 (second layer), L3 (third layer) can be divided into the physical layer belonging to the first layer of the information transfer service (Information Transfer Service) using a physical channel (Physical Channel) is provided, The RRC (Radio Resource Control) layer located in the third layer plays a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges an RRC message between the terminal and the base station.

FIG. 2 is a block diagram illustrating a radio protocol architecture for a user plane. 3 is a block diagram illustrating a radio protocol structure for a control plane. The user plane is a protocol stack for user data transmission, and the control plane is a protocol stack for control signal transmission.

2 and 3, a physical layer (PHY) layer provides an information transfer service to a higher layer using a physical channel. The physical layer is connected to a medium access control (MAC) layer, which is an upper layer, through a transport channel. Data is moved between the MAC layer and the physical layer through the transport channel. Transport channels are classified according to how and with what characteristics data is transmitted over the air interface.

Data moves between physical layers between physical layers, that is, between physical layers of a transmitter and a receiver. The physical channel may be modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.

The functions of the MAC layer include mapping between logical channels and transport channels and multiplexing / demultiplexing into transport blocks provided as physical channels on transport channels of MAC service data units (SDUs) belonging to the logical channels. The MAC layer provides a service to a Radio Link Control (RLC) layer through a logical channel.

Functions of the RLC layer include concatenation, segmentation, and reassembly of RLC SDUs. In order to guarantee the various quality of service (QoS) required by the radio bearer (RB), the RLC layer has a transparent mode (TM), an unacknowledged mode (UM), and an acknowledged mode (Acknowledged Mode). Three modes of operation (AM). AM RLC provides error correction through an automatic repeat request (ARQ).

The RRC (Radio Resource Control) layer is defined only in the control plane. The RRC layer is responsible for the control of logical channels, transport channels, and physical channels in connection with configuration, re-configuration, and release of radio bearers. RB means a logical path provided by the first layer (PHY layer) and the second layer (MAC layer, RLC layer, PDCP layer) for data transmission between the terminal and the network.

Functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include delivery of user data, header compression, and ciphering. The functionality of the Packet Data Convergence Protocol (PDCP) layer in the control plane includes the transfer of control plane data and encryption / integrity protection.

The establishment of the RB means a process of defining characteristics of a radio protocol layer and a channel to provide a specific service, and setting each specific parameter and operation method. RB can be further divided into SRB (Signaling RB) and DRB (Data RB). The SRB is used as a path for transmitting RRC messages in the control plane, and the DRB is used as a path for transmitting user data in the user plane.

If an RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in an RRC connected state, otherwise it is in an RRC idle state.

The downlink transmission channel for transmitting data from the network to the UE includes a BCH (Broadcast Channel) for transmitting system information and a downlink shared channel (SCH) for transmitting user traffic or control messages. Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH). Meanwhile, the uplink transport channel for transmitting data from the terminal to the network includes a random access channel (RACH) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.

It is located above the transport channel, and the logical channel mapped to the transport channel is a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), and a multicast traffic (MTCH). Channel).

The physical channel is composed of several OFDM symbols in the time domain and several sub-carriers in the frequency domain. One sub-frame consists of a plurality of OFDM symbols in the time domain. The RB is a resource allocation unit and includes a plurality of OFDM symbols and a plurality of subcarriers. In addition, each subframe may use specific subcarriers of specific OFDM symbols (eg, the first OFDM symbol) of the corresponding subframe for the physical downlink control channel (PDCCH), that is, the L1 / L2 control channel. Transmission Time Interval (TTI) is a unit time of subframe transmission.

Hereinafter, a new radio access technology (new RAT, NR) will be described.

As more communication devices demand larger communication capacities, there is a need for improved mobile broadband communication as compared to conventional radio access technology (RAT). Massive Machine Type Communications (MTC), which connects multiple devices and objects to provide various services anytime and anywhere, is also one of the major issues to be considered in next-generation communication. In addition, communication system design considering services / terminals that are sensitive to reliability and latency has been discussed. The introduction of next-generation wireless access technologies in consideration of such extended mobile broadband communication, massive MTC, Ultra-Reliable and Low Latency Communication (URLLC), and the like are discussed in the present invention for convenience. Is called new RAT or NR.

4 illustrates a system structure of a new generation radio access network (NG-RAN) to which NR is applied.

Referring to FIG. 4, the NG-RAN may include a gNB and / or eNB that provides a user plane and control plane protocol termination to the terminal. 4 illustrates a case of including only gNB. gNB and eNB are connected to each other by Xn interface. The gNB and eNB are connected to a 5G Core Network (5GC) through an NG interface. More specifically, the access and mobility management function (AMF) is connected through the NG-C interface, and the user plane function (UPF) is connected through the NG-U interface.

5 illustrates the functional division between NG-RAN and 5GC.

Referring to FIG. 5, the gNB may configure inter-cell radio resource management (Inter Cell RRM), radio bearer management (RB control), connection mobility control, radio admission control, and measurement setup and provision. (Measurement configuration & provision), dynamic resource allocation, and the like can be provided. AMF can provide functions such as NAS security, idle state mobility handling, and the like. The UPF may provide functions such as mobility anchoring and PDU processing. The Session Management Function (SMF) may provide functions such as terminal IP address allocation and PDU session control.

6 illustrates a frame structure that can be applied in the NR.

Referring to FIG. 6, the frame may consist of 10 ms (milliseconds) and may include 10 subframes composed of 1 ms.

One or more slots may be included in the subframe according to subcarrier spacing.

Table 1 below illustrates a subcarrier spacing configuration μ.

The following table 2 illustrates such a subcarrier spacing setting (subcarrier spacing configuration), intra-frame slot number (N ^frameμ _slot), the sub-frame within the number of slots (N ^subframeμ _slot), the slot within the symbol number (N ^slot _symb) in accordance with μ .

In FIG. 6, μ = 0, 1 and 2 are illustrated.

The physical downlink control channel (PDCCH) may be composed of one or more control channel elements (CCEs) as shown in Table 3 below.

That is, the PDCCH may be transmitted through a resource composed of 1, 2, 4, 8, or 16 CCEs. Here, the CCE is composed of six resource element groups (REGs), and one REG is composed of one resource block in the frequency domain and one orthogonal frequency division multiplexing (OFDM) symbol in the time domain.

Meanwhile, in NR, a new unit called control resource set (CORESET) can be introduced. The terminal may receive the PDCCH in the CORESET.

7 illustrates CORESET.

Referring to FIG. 7, the CORESET may be configured of N ^CORESET _RB resource blocks in the frequency domain and may be configured by N ^CORESET _symb ∈ {1, 2, 3} symbols in the time domain. N ^CORESET _RB , N ^CORESET _symb may be provided by a base station through a higher layer signal. As shown in FIG. 7, a plurality of CCEs (or REGs) may be included in the CORESET.

The UE may attempt PDCCH detection in units of 1, 2, 4, 8, or 16 CCEs in CORESET. One or a plurality of CCEs capable of attempting PDCCH detection may be referred to as PDCCH candidates.

The terminal may receive a plurality of resets.

8 is a diagram showing a difference between a conventional control region and a CORESET in the NR.

Referring to FIG. 8, a control region 800 in a conventional wireless communication system (eg, LTE / LTE-A) is configured over the entire system band used by a base station. Except for some terminals (eg, eMTC / NB-IoT terminals) that support only a narrow band, all terminals may receive radio signals of the entire system band of the base station in order to properly receive / decode control information transmitted by the base station. I should have been able.

In NR, on the other hand, the above-described CORESET was introduced. The CORESETs 801, 802, and 803 may be referred to as radio resources for control information that the terminal should receive, and may use only a part of the system band instead of the entire system band. The base station may allocate CORESET to each terminal and transmit control information through the assigned CORESET. For example, in FIG. 8, the first CORESET 801 may be allocated to the terminal 1, the second CORESET 802 may be allocated to the second terminal, and the third CORESET 803 may be allocated to the terminal 3. The terminal in the NR may receive control information of the base station even though the terminal does not necessarily receive the entire system band.

In the CORESET, there may be a terminal specific CORESET for transmitting terminal specific control information and a common CORESET for transmitting control information common to all terminals.

Meanwhile, in the NR, high reliability may be required according to an application field, and in such a situation, downlink control information transmitted through a downlink control channel (eg, a physical downlink control channel (PDCCH)) may be required. The target block error rate (BLER) can be significantly lower than the prior art. An example of a method for satisfying such a high reliability requirement may be to reduce the amount of content included in the DCI and / or increase the amount of resources used in DCI transmission. . In this case, the resource may include at least one of a resource in the time domain, a resource in the frequency domain, a resource in the code domain, and a resource in the spatial domain.

In NR, the following techniques / features may apply.

Self-contained subframe structure

9 shows an example of a frame structure for a new radio access technology.

In NR, a structure in which a control channel and a data channel are time division multiplexed (TDM) in one TTI is considered as one of the frame structures for the purpose of minimizing latency. Can be.

In FIG. 9, the hatched area represents a downlink control area, and the black part represents an uplink control area. An area without an indication may be used for downlink data (DL data) transmission or may be used for uplink data (UL data) transmission. The characteristics of this structure is that downlink (DL) transmission and uplink (UL) transmission are sequentially performed in one subframe, and DL data is transmitted in a subframe, and UL ACK / Acknowledgment / Not-acknowledgement (NACK) may also be received. As a result, when a data transmission error occurs, it takes less time to retransmit data, thereby minimizing the latency of the final data transmission.

In this data and control TDMed subframe structure, a time gap for a base station and a UE to switch from a transmission mode to a reception mode or a process from a reception mode to a transmission mode ) Is required. To this end, some OFDM symbols at the time of switching from DL to UL in the self-contained subframe structure may be configured as a guard period (GP).

<Analog beamforming # 1>

In millimeter wave (mmW), the wavelength is shortened to allow the installation of multiple antenna elements in the same area. That is, in the 30 GHz band, the wavelength is 1 cm, and a total of 100 antenna elements can be installed in a 2-dimension array at 0.5 wavelength intervals on a panel of 5 by 5 cm. Therefore, in mmW, a plurality of antenna elements are used to increase beamforming (BF) gain to increase coverage or to increase throughput.

In this case, if a transceiver unit (TXRU) is provided to enable transmission power and phase adjustment for each antenna element, independent beamforming is possible for each frequency resource. However, in order to install TXRU in all 100 antenna elements, there is a problem in terms of cost effectiveness. Therefore, a method of mapping a plurality of antenna elements to one TXRU and adjusting the direction of the beam with an analog phase shifter is considered. Such an analog beamforming method has a disadvantage in that it is not possible to perform frequency selective beamforming because only one beam direction can be made in the entire band.

A hybrid BF having B TXRUs, which is smaller than Q antenna elements, may be considered as an intermediate form between digital beamforming and analog beamforming. In this case, although there are differences depending on the connection scheme of the B TXRU and the Q antenna elements, the direction of beams that can be transmitted simultaneously is limited to B or less.

<Analog beamforming # 2>

In the NR system, when multiple antennas are used, a hybrid beamforming technique that combines digital beamforming and analog beamforming has emerged. At this time, analog beamforming (or RF beamforming) performs precoding (or combining) at the RF stage, which causes the number of RF chains and the number of D / A (or A / D) converters. It has the advantage that it can reduce the performance and get close to the digital beamforming. For convenience, the hybrid beamforming structure may be represented by N TXRUs and M physical antennas. Then, the digital beamforming of the L data layers to be transmitted by the transmitter can be represented by an N by L matrix, and then the converted N digital signals are converted into analog signals via TXRU. The converted analog beamforming is then applied to the M by N matrix.

10 schematically illustrates a hybrid beamforming structure in terms of the TXRU and physical antenna.

In FIG. 10, the number of digital beams is L, and the number of analog beams is N. Furthermore, in the NR system, the base station is designed to change the analog beamforming in units of symbols to consider a direction for supporting more efficient beamforming for a terminal located in a specific region. Furthermore, when defining specific N TXRUs and M RF antennas as one antenna panel in FIG. 10, the NR system considers a method of introducing a plurality of antenna panels to which hybrid beamforming independent of each other is applicable. It is becoming.

As described above, when the base station utilizes a plurality of analog beams, analog beams advantageous for signal reception may be different for each terminal, and thus, at least a synchronization signal, system information, paging, etc. may be used for a specific subframe. In the present invention, a beam sweeping operation for changing a plurality of analog beams to be applied by a base station for each symbol so that all terminals have a reception opportunity is considered.

FIG. 11 is a diagram illustrating the beam sweeping operation with respect to a synchronization signal and system information in a downlink (DL) transmission process.

In FIG. 11, a physical resource (or physical channel) through which system information of the NR system is transmitted in a broadcasting manner is named as a xPBCH (physical broadcast channel). In this case, analog beams belonging to different antenna panels in a symbol may be transmitted simultaneously, and a single analog beam (corresponding to a specific antenna panel) is applied as illustrated in FIG. 11 to measure channels for analog beams. A method of introducing a beam RS (BRS), which is a reference signal (RS) to be transmitted, has been discussed. The BRS may be defined for a plurality of antenna ports, and each antenna port of the BRS may correspond to a single analog beam. In this case, unlike the BRS, the synchronization signal or the xPBCH may be transmitted by applying all the analog beams in the analog beam group so that any terminal can receive it well.

Hereinafter, the present invention will be described.

In the LTE system, in order to perform load control of each cell more efficiently, a method of determining UL-DL configuration for each cell, informing the corresponding cell to the neighboring cell, interference coordination method, etc. Has been discussed in the field of enhanced interference mitigation and traffic adaptation (eIMTA).

Meanwhile, in the NR system, it is desirable to perform dynamic UL / DL configuration rather than LTE, and a method of maximizing resource utilization is required by enabling a plurality of UL / DL configurations in a cell. Do. The present invention proposes a method of grouping terminals in a cell, a method of changing a group, and an operation method of each entity (network and / or terminal) for smoothly performing operations for each group. In other words, we propose a measurement and grouping method for grouping terminals in a cell for flexible UL / DL configuration.

First, the terminal grouping method will be described below.

(Method 1) and (Method 2), which will be described later, may be used for a terminal group alone or through a combination of Methods 1 and 2. For example, the network may indicate both measurements, and each terminal group classified by serving cell measurement may be once again grouped by neighbor cell measurement results.

(Method 1) Serving Cell Measurement Based Grouping.

The network may group UEs based on the serving cell measurement result reported by the UE, and each UE may implicitly know the group to which it belongs based on the measurement result or higher layer signaling. This can be known as a network indication through signaling.

At this time, the serving cell measurement for determining the terminal group may be considered as follows. A resource for notifying configuration for each group to be described later may include information for CORESET and / or search space set (SS set) and / or control channel decoding (eg, scrambling sequence). (scrambling sequence), a radio network temporary identifier (RNTI), a search space occasion (eg, when a search space is TDM among different groups, etc.) The UE may know the configuration of the corresponding group through reception of a control channel (eg, PDCCH scrambled with SFI-RNTI) in the corresponding resource.

A method of using a synchronization signal block (SSB), a synchronization signal and a physical broadcast channel (PBCH) measurement result.

In NR, the synchronization signal block (SSB, synchronization signal and physical broadcast channel (PBCH)) in the time domain is 4 OFDM symbols numbered in ascending order from 0 to 3 within the synchronization signal block. And a PBCH associated with a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a demodulation reference signal (DMRS) may be mapped to the symbols. . Here, the synchronization signal block may also be expressed as an SS / PBCH block.

Here, grouping may be performed based on the measurement result for the SSB. For example, the base station may repeatedly transmit the SSB while changing the beam direction and the index, and the terminal may regard the index of the best SSB as the index of the group to which the terminal belongs, as a result of measuring the SSB. Alternatively, SSB indexes may be grouped together to be considered as a group. For example, when there are N groups, all SSB indices may be distributed continuously or uniformly to N. Alternatively, mapping to SSB index to group index may be set.

Here, the UE may report the measurement result for the SSB or may inform the network of the group to which the UE belongs by the method of performing the RACH procedure based on the SSB measurement.

Here, in order to indicate the setting for each group, the network may inform the group associated with each SSB or the group to which the terminal belongs and / or the resource associated with the group after receiving a report of the terminal in advance. The UE may receive a configuration (eg, UL / DL configuration) for a group to which it belongs in a resource associated with a best SSB (measurement result).

For example, for information on a carrier transmitted from system information (for example, maintaining minimum system information, etc.) or semi-static DL / UL configuration, Assuming that the RMSI information transmitted in all beam indexes is the same, the RMSI may be transmitted. Thus, this information is downlinked to all groups that are semi-static in common with frequencies that are common to all groups (for example, when the frequency used for all groups is the union region). For resources that are used only as a link (DL, which may mean that the network is also used only as a downlink), or for resources that are used only as an uplink (UL) for all semi-static groups It can mean that it can be indicated.

Separately, send group-common DL / UL configuration (where it can use the same configuration method as cell-specific DL / UL configuration) to RMSI for all groups Alternatively, another semi-static DL / UL assignment may be configured for each UE-specific group.

Channel state information-reference signal (CSI-RS) method of using a reference signal received power (RSRP).

The UE may report the measurement result for the CSI-RS ports instructing the network to perform the measurement. For example, the terminal may report the best CSI-RS port having the largest signal strength, and the group to which the terminal belongs may be determined based on this.

Here, in order to indicate the setting for each group, the network is a resource associated with each CSI-RS port (or CSI-RS port group) in advance, or a group to which the terminal belongs after receiving the report of the corresponding terminal and And / or inform the resource associated with the group, the terminal (measurement result) to the configuration (for example, UL / DL configuration) for the group to which it belongs in the resource associated with the best (SI) CSI-RS Can be received.

A method using channel state information (CSI) (eg channel quality indicator (CQI) and / or precoding matrix indicator (PMI)).

The network may set the terminal group based on the CQI and / or PMI reported by the terminal. Here, in order to indicate the setting for each group, the network is a resource associated with each CQI and / or PMI (or CQI / PMI group) in advance, or a group to which the terminal belongs after receiving the report of the terminal and And / or inform the resource associated with the group, the terminal (measurement result) setting for the group to which it belongs to the resource associated with the best (CQI) and / or PMI (for example, UL / DL configuration ) Can be received.

A method of using uplink signal measurement.

The network may instruct uplink transmission on different resources to different terminals or terminal groups, and each terminal may report a measurement result of uplink transmission of another terminal.

Here, for example, a frequency domain resource is divided into a plurality of subbands in a specific time domain resource, and uplink transmission is performed in different subbands for each terminal or terminal group. Can be instructed.

In this case, the UE instructed to perform the measurement may measure RSRP (for example, when a specific sequence is transmitted for each subband) or reference signal strength indicator (RSSI) for each subband. In doing so, it is possible to report the subband with the largest measured value (or upper X subbands or subbands exceeding a certain threshold).

Meanwhile, the aforementioned uplink transmission measurement operation may be used for grouping purposes of a new terminal in a situation in which grouping of terminals is performed.

Here, such uplink transmission may be used as a method for designating a terminal group or for identifying an interference environment of a specific terminal group. When the terminal group is designated, the terminal may be previously assigned or signaled to belong to the terminal group corresponding to the subband having the largest uplink power. If the interference characteristic is to be determined, the corresponding result may be reflected in the UL / DL configuration of the UE group corresponding to the subband having the largest uplink power and the UE group to which the UE performing the measurement belongs. For example, when a specific terminal performs downlink reception, scheduling may be performed such that uplink transmission of a terminal group in which uplink power is measured the largest in the measurement of the corresponding terminal is not performed on the corresponding resource.

12 shows an example of a method of designating an uplink transmission entity for each subband. Here, the transmission and / or measurement operation may be performed in the designated entity unit (eg, for each terminal or for each terminal group).

According to FIG. 12, frequency domains are divided into subbands and sequentially arranged from subband 0 to subband 8. FIG.

Here, according to FIG. 12A, UE0 to UE3 are designated as uplink transmission entities in a one-to-one correspondence with respect to subband SB 0 to subband 3, respectively. For the subband 8, the terminal 4 to the terminal 7 may be designated as an uplink transmission entity in a one-to-one correspondence manner.

In addition, according to FIG. 12B, UE group 0 is designated as an uplink transmission entity for subband 0 and subband 1, and UE group 1 is designated as an uplink transmission entity for subband 2 and subband 3. UE group 2 may be designated as an uplink transmission entity for subband 6 and subband 7.

Here, as described above, the designation of the terminal or the terminal group as shown in (a) and (b) of FIG. 12 may be for performing a terminal grouping setting method using uplink transmission.

(Method 2) Neighbor Cell Measurement Based Grouping.

In the case of neighbor cell measurement, the SSB and CSI-RS ports proposed in (Method 1) can be applied to the neighbor cell. However, in the case of neighbor cell measurement, in order to reduce the complexity of the terminal, the serving cell may provide information for neighbor cell measurement to each terminal in the corresponding cell. For example, SSB transmission timing and corresponding SSB index of each neighboring cell, transmission timing for CSI-RS ports, CSI-RS port number, CSI-RS sequence related information (for example, Reference point (ie, common resource block (CRB) 0 related information and CSI-RS transmission bandwidth, etc.) and the like through UE-dedicated signaling or broadcast signaling (broadcast signaling) Can be. In addition, information associated with the best resource (for example, SSB, CSI-RS) measured for the neighboring cell may also be signaled.

The measurement for the uplink signal may also be included in the neighbor cell measurement. For example, a plurality of UE groups belonging to a specific neighbor cell may be instructed to specify different subbands and perform uplink transmission, and the serving cell may include resource information (eg, time / The terminal may be instructed to perform measurement on the frequency resources (subband size).

Additionally, each subband may be allocated to a different neighbor cell to instruct uplink transmission. This may be used as a method for identifying the interference characteristics of the cell unit.

13 shows an example of subband uplink transmission on a cell basis.

In FIG. 13, cell 0 (Cell0) may perform uplink transmission in the region of subbands 0 to 3, and each subband may specify that uplink transmission of different UE groups of the corresponding cell is performed. . When instructing the measurement of the subband unit of the serving cell, the unit of measurement may be specified in singular or plural. For example, in FIG. 13, four subband unit measurements of the serving cell and each subband unit measurement may be indicated, and the terminal may be instructed to perform a report on each of them.

14 is a flowchart illustrating a method of receiving UL / DL configuration information performed by a terminal according to an embodiment of the present invention.

According to FIG. 14, the terminal performs measurement on a plurality of SSBs having different beam directions (S1410).

Thereafter, the terminal transmits the SSB measurement information to the network (S1420). Here, the SSB measurement information may inform the best SSB selected by the terminal based on the measurement among the plurality of SSBs. In one example, the SSB measurement information may indicate the index of the best SSB.

Thereafter, the terminal receives UL / DL configuration information from the network (S1430). Here, the UL / DL configuration information may be group-common. In this case, a group may be a set of UEs having the same best SSB. In other words, for example, when the first terminal and the second terminal each selects the best SSB as SSB # N and transmit measurement information to the network, the first UL / DL configuration information received by the first terminal. And the second UL / DL configuration information received by the second terminal may be identical to each other.

15 schematically illustrates an example in which an embodiment of the present invention is implemented.

According to FIG. 15, the base station transmits SSB1 to SSB6 in different beam directions. Here, the terminals 1 to 6 in the cell may perform the measurement for SSB1 to SSB6.

Here, for example, UE 1 and UE 2 may select SSB2 as the best SSB, UE 3 may select SSB3 as the best SSB, and UE 4, UE 5 and UE 6 may select SSB4 as the best SSB. have.

In this case, UE1 and UE2 receive first UL / DL configuration information, UE3 receives second UL / DL configuration information, and UE4, UE5, and UE6 configure third UL / DL configuration, respectively. Information can be received. That is, the UL / DL configuration information may be the best SSB specific. That is, the terminal 1 and the terminal 2 can receive the first UL / DL configuration belonging to the first terminal group, respectively, the terminal 3 can receive the second UL / DL configuration belonging to the second terminal group, terminal 4 , UE 5 and UE 6 may belong to the third terminal group and receive the third UL / DL configuration, respectively.

Next, reception and reporting of a neighbor cell slot format indicator (SFI) will be described below.

In the above, a terminal grouping method considering channel and interference environment of each terminal in a specific cell is proposed. The network may increase resource utilization of a corresponding cell by assigning different UL / DL configuration and / or slot formats to different UE groups.

Hereinafter, the present invention will be mainly described based on a slot format indicator (SFI). However, when different settings such as different UL / DL settings are applied to each UE group, it is obvious that the present invention is also included in the scope of the present invention.

In NR, SFI may be transmitted through a group common PDCCH. However, there is no clear definition of the group forming method and operation for each group until now, and the present invention proposes the group forming method and the operation due to grouping.

SFI can be dynamically changed and signaled by the needs of the network, and if the SFIs between adjacent cells or between adjacent terminals are different, interference due to different transmission directions will seriously impair decoding performance. Can be.

Accordingly, there is a need for a method for coping with rapidly changing SFIs between different cells, and the present invention proposes a method for quickly knowing the SFIs of neighboring cells and a network / terminal operation in each method. Through this, the network may designate an available SFI for each terminal or terminal group.

16 shows an example of a case where a plurality of terminal groups are defined in each cell.

According to FIG. 16, there are eight terminal groups of the terminal group 0-0 to the terminal group 0-7 in the cell 0, and a total of eight of the terminal group 1-0 to the terminal group 1-7 in the cell 1 Terminal groups exist.

Hereinafter, for convenience of description, it is assumed that the terminal group in each cell is determined by the best SSB of each terminal, but the terminal group determination by a method other than the SSB may also belong to the scope of the present invention.

In FIG. 16, assuming that each terminal group uses different SFIs, information required for each terminal is the SFI of the terminal group that most affects the corresponding terminal. For example, in FIG. 16, information required for a terminal belonging to the terminal group 0-3 is an SFI of the terminal group that most affects the terminal, which is the terminal group 1- which is the terminal group closest to the terminal group 0-3. It may be an SFI of six. Accordingly, the present invention proposes a method for efficiently decoding the SFI.

First, a method of setting a group-specific CORESET / SS set for the SFI indication will be described.

In the current NR, DCI monitoring for SFI is monitored by the CORESET / SS set configuration given by the UE-dedicated signaling (UE-dedicated signaling). This means that when the SFI for each UE group is applied, when the UE group is changed due to the movement of the UE, the SFI monitoring resource can be changed only through RRC signaling, which causes signaling overhead and time delay. (time delay) may act as a factor that prevents smooth terminal operation.

Therefore, in order to solve the above problem, the present invention proposes that a preset CORESET / SS set for SFI monitoring is determined in advance for each terminal group. For example, the network may instruct each UE in advance of CORESET / SS set configuration for each UE group through RRC signaling, and each UE may change the UE group if the UE group to which the UE belongs is changed by measurement. For this purpose, SFI monitoring can be performed according to the predefined CORESET / SS set configuration. In other words, the network informs the RRC in advance of the CORESET / SS set configuration for the various groups in advance, among which the group the UE belongs to (to reduce the signaling delay) or the MAC CE (control element) or It means that it can be designated as DCI.

Here, it may be assumed that one terminal may belong to only one group by default, and that the terminal belongs to the previous group until a new group is designated, or the measured value is within a certain threshold / range or of specific values. Once in the value set, the existing group can be kept, otherwise the existing group can be assumed to be invalid, and SFI monitoring can be skipped until a new group is formed. In this case, it is assumed that the SFI is not configured, and the terminal operation may be performed. Alternatively, if the SFI is configured but missed (case), the UE operation may be performed. If the group is changed in this way, it is assumed that the SFI of the previous group is not valid, and it is assumed that the SFI is not configured until the SFI is transmitted in the new group or that the SFI is missing.

Or there may be a new terminal operation in this situation. This may be to specify a new fallback behavior. An example of a fallback behavior is to monitor control resources and perform measurement actions, but to uplink or downlink by a semi-static configuration. It can mean that monitoring and measurement are performed only on defined resources.

Group-specific CORESET / SS set establishment can be indicated in the following manner.

(1) 1 CORESET and 1 SS set and group specific scrambling.

In order to reduce resource waste due to SFI transmission and reception, only one set of CORESET and SS for SFI is specified, and SFIs for different groups have different scrambling parameters (eg, UE group index, SSB index, SSI (spatial division multiplexing) between different groups of SFIs can be implemented by CSI-RS port index).

Here, group specific scrambling may be replaced with group specific RS scrambling, PDCCH scrambling, or the like. That is, the same SFI RNTI may be used, but scrambling used for decoding the corresponding PDCCH may be designated for each group.

(2) One CORESET and group specific SS set (or group specific time domain resources).

The different groups may consist of different analog beams (as determined by the CSI-RS for the SSB or CSI-RS resource indicator). In this case, it may be desirable to transmit and receive different groups in the time domain.

Here, the network may set different SS set settings for each group with respect to a common CORESET, and the UE may perform SFI monitoring by applying the SS set associated with the UE group to which the UE belongs.

(3) Group specific CORESET / SS set.

It may be desirable for each group to use different settings according to the number of terminals belonging to the group.

Here, the network may set different CORESET / SS sets for each UE group in the corresponding cell, and the UE may perform SFI monitoring according to the CORESET / SS sets set associated with the UE group to which the network belongs.

(4) One CORESET / SS set.

One SFI monitoring CORESET / SS may be configured, and the indexes of candidates used by groups in the SS may be different, or the RNTI may be different. In this case, multiple groups may use the same SS and need at least SS candidates. Therefore, if the number of SS candidates is increased or if candidates are still limited, network flexibility may be increased by using RNTIs differently for each group with multiple SSs. That is, one group set may be formed by grouping several groups, one SS (or one CORESET / SS) may be configured for each group set, and each group set may be distinguished as an RNTI. For this purpose, resource configuration (for example, SS or CORESET / SS) and RNTI configuration may be separately performed for each group. This may be expressed as being configured with SS (associated with RNTI) or CORESET / SS (associated with RNTI) for several SFIs.

Next, the neighbor cell SFI monitoring will be described.

As described above, a different signal direction between adjacent terminals may act as a large interference in receiving a signal of a specific terminal. In addition, each cell may change the SFI for each UE group in a fast cycle, and it may be difficult to solve this by inter-cell coordination using X2 signaling or the like.

In addition, it is preferable that one terminal decodes SFIs for all terminal groups of a neighboring cell because it may increase the complexity and inefficiency of the terminal. Preferably, each terminal is required to receive the SFIs of the neighboring cell and the terminal group (s) within that cell most affecting them. For this operation, it is important for each terminal to know the neighboring cell and terminal groups that have the greatest influence on them and the CORESET / SFI monitoring occasion for the group. To this end, the present invention proposes to operate as follows.

(1) CORESET / SS set of neighbor cell

The gNB of each cell proposes to exchange SFI monitoring information (per UE group) (CORESET / SS set configuration) of the neighbor cell through coordination with the neighbor cell.

Here, the SFI monitoring information of the neighbor cell may be delivered to UEs in the cell through UE-dedicated signaling or through a broadcast signal.

For neighbor cell SFI monitoring, the following options may be considered.

(Option 1) SFI monitoring (of the neighboring cell) is performed to the corresponding terminal based on the neighbor cell measurement reported by each terminal (for example, the neighboring cell and / or the terminal group having the largest signal strength). CORESET / SS set establishment (and / or RNTI) to be monitored may be signaled to be performed.

(Option 2) The gNB is based on the neighbor cell measurement reported by each terminal (eg, neighbor cell having the largest received signal strength), and the SFI monitoring information (CORESET / SS set) for each terminal group of the corresponding neighbor cell. And / or RNTI) to be monitored). The terminal may monitor the neighbor cell SFI based on the SFI monitoring information corresponding to its measurement result (eg, the terminal group having the greatest influence) among the corresponding information.

(Option 3) The gNB broadcasts all SFI monitoring related information provided from each neighbor cell, and the terminal may monitor the neighbor cell SFI based on the corresponding SFI monitoring information based on the measurement result.

(2) neighbor cell SFI reporting

Each terminal may report to the serving gNB the SFI of the neighboring cell / terminal group that has the greatest influence on the terminal through the above-described process. Here, the report may be performed using periodic report and / or aperiodic report. Alternatively, when the terminal group of the corresponding terminal is changed or the neighbor cell measurement result is changed, the report may be performed.

Next, inter-cell coordination will be described.

Each gNB may exchange UE group matching information between cells based on the information reported by the UE. Here, the inter-cell terminal group matching information may mean correlation information between a terminal group of a specific neighboring cell and its own terminal group, which indicates the inter-cell terminal group pair that has the greatest influence. It may mean an operation of exchanging.

Additionally, inter-cell coordination may be considered using an air interface between base stations, rather than an X2 interface. This allows for lower delay inter-cell coordination compared to using the X2 interface. Here, each cell may allocate resources for radio communication between gNBs for each neighbor cell. Through the corresponding resource, each gNB may transmit and receive interference-related information, including UE grouping related information and SFI information for each UE group, with a specific gNB.

In addition, the following schemes may be considered for the UE of each cell to smoothly perform SFI reception of the neighbor cell.

SFI monitoring time points may be exchanged between neighboring cells, and alignment thereof may be performed.

When the uplink transmission overlaps with the SFI monitoring time of the neighbor cell, the terminal may be predefined to perform the neighbor cell SFI monitoring (or uplink transmission) in advance, or the network may signal through higher layer signaling or the like. .

Next, network operation will be described.

Each gNB may determine an SFI for a corresponding terminal (or a terminal group to which the corresponding terminals belong) based on the neighbor cell SFI received from the terminal in the cell, or perform the following operation.

When a terminal of a cell is downlink and a group of aggressor terminals of a neighbor cell is uplink by a combination of a serving cell SFI and a neighbor cell SFI, the network performs downlink transmission of the terminal of the cell (X times). Repeated transmission may be performed, which may be defined in advance or may be instructed to the terminal through higher layer signaling.

In addition, in the case of a slot (and / or symbol (s)) indicated as flexible or unknown on the SFI of the neighbor cell, the network assumes that the resource is an uplink (or downlink) resource. can do. Alternatively, for more accurate operation, the UE may be instructed to perform a measurement and report for each transmission direction based on the neighbor cell SFI.

17 schematically illustrates an example to which the present invention is applied.

According to FIG. 17, the first base station transmits a plurality of SSBs having different beam directions to the terminal (S1710).

Thereafter, the terminal performs SSB measurement on the plurality of SSBs and selects a best SSB based on the SSB measurement (S1720).

Thereafter, the terminal transmits the SSB measurement information to the first base station (S1730). Here, the SSB measurement information may include information about the best SSB.

Thereafter, the first base station transmits the UL / DL configuration information to the terminal (S1740). Here, the UL / DL configuration information may be group-common. Also, the group may be a set of terminals where the best SSB is the same. Specifically, although not shown in FIG. 17, when a specific terminal selects the same best SSB as the terminal and transmits SSB measurement information to the first base station, respectively, the first base station transmits the same UL / DL to the specific terminal and the terminal. Each setting information can be transmitted.

Thereafter, the first base station transmits control resource configuration information to the second base station (S1750). Here, the control resource configuration information may include configuration information on CORESET per group and configuration information on SS set per group.

Thereafter, the first base station transmits the group information to the second base station (S1760). Here, the group information may include information on groups controlled by the first base station.

Although not shown in FIG. 17, the above-described various configurations and / or embodiments may be applied, and thus redundant descriptions thereof will be omitted.

Hereinafter, an apparatus to which the present invention can be applied will be described.

18 illustrates a wireless communication device according to an embodiment of the present invention.

Referring to FIG. 18, a wireless communication system may include a first device 9010 and a second device 9020.

The first device 9010 includes a base station, a network node, a transmission terminal, a reception terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, a connected car, a drone (Unmanned Aerial Vehicle, UAV (Artificial Intelligence) Module, Robot, Augmented Reality Device, Virtual Reality Device, Mixed Reality Device, Hologram Device, Public Safety Device, MTC Device, IoT Device, Medical Device, Pin It may be a tech device (or financial device), a security device, a climate / environment device, a device related to 5G service, or another device related to the fourth industrial revolution field.

The second device 9020 includes a base station, a network node, a transmitting terminal, a receiving terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, a connected car, a drone (Unmanned Aerial Vehicle, UAV (Artificial Intelligence) Module, Robot, Augmented Reality Device, Virtual Reality Device, Mixed Reality Device, Hologram Device, Public Safety Device, MTC Device, IoT Device, Medical Device, Pin It may be a tech device (or financial device), a security device, a climate / environment device, a device related to 5G service, or another device related to the fourth industrial revolution field.

For example, the terminal may be a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), navigation, a slate PC, a tablet. It may include a tablet PC, an ultrabook, a wearable device (eg, a smartwatch, a glass glass, a head mounted display), and the like. . For example, the HMD may be a display device worn on the head. For example, the HMD can be used to implement VR, AR or MR.

For example, a drone may be a vehicle in which humans fly by radio control signals. For example, the VR device may include a device that implements an object or a background of a virtual world. For example, the AR device may include a device that connects and implements an object or a background of the virtual world to an object or a background of the real world. For example, the MR device may include a device that fuses and implements an object or a background of the virtual world to an object or a background of the real world. For example, the hologram device may include a device that records and reproduces stereoscopic information to implement a 360 degree stereoscopic image by utilizing interference of light generated by two laser lights, called holography, to meet each other. For example, the public safety device may include an image relay device or an image device wearable on a human body of a user. For example, the MTC device and the IoT device may be devices that do not require direct human intervention or manipulation. For example, the MTC device and the IoT device may include a smart meter, a bending machine, a thermometer, a smart bulb, a door lock or various sensors. For example, a medical device may be a device used for the purpose of diagnosing, treating, alleviating, treating or preventing a disease. For example, a medical device may be a device used for the purpose of diagnosing, treating, alleviating or correcting an injury or disorder. For example, a medical device may be a device used for the purpose of inspecting, replacing, or modifying a structure or function. For example, the medical device may be a device used for controlling pregnancy. For example, the medical device may include a medical device, a surgical device, an (extracorporeal) diagnostic device, a hearing aid or a surgical device, and the like. For example, the security device may be a device installed to prevent a risk that may occur and to maintain safety. For example, the security device may be a camera, a CCTV, a recorder or a black box. For example, the fintech device may be a device capable of providing financial services such as mobile payment. For example, the fintech device may include a payment device or a point of sales (POS). For example, the climate / environmental device may include a device that monitors or predicts the climate / environment.

The first device 9010 may include at least one or more processors, such as a processor 9011, at least one or more memories, such as a memory 9012, and at least one or more transceivers, such as a transceiver 9013. The processor 9011 may perform the functions, procedures, and / or methods described above. The processor 9011 may perform one or more protocols. For example, the processor 9011 may perform one or more layers of a radio interface protocol. The memory 9012 may be connected to the processor 9011 and store various types of information and / or instructions. The transceiver 9013 may be connected to the processor 9011 and controlled to transmit and receive a wireless signal.

The second device 9020 may include at least one processor such as the processor 9021, at least one memory device such as the memory 9022, and at least one transceiver, such as the transceiver 9023. The processor 9021 may perform the functions, procedures, and / or methods described above. The processor 9021 may implement one or more protocols. For example, the processor 9021 may implement one or more layers of a radio interface protocol. The memory 9022 is connected to the processor 9021 and may store various types of information and / or instructions. The transceiver 9023 is connected to the processor 9021 and may be controlled to transmit and receive a wireless signal.

The memory 9012 and / or the memory 9022 may be respectively connected inside or outside the processor 9011 and / or the processor 9021, and may be connected to other processors through various technologies such as a wired or wireless connection. It may also be connected to.

The first device 9010 and / or the second device 9020 may have one or more antennas. For example, antenna 9014 and / or antenna 9024 may be configured to transmit and receive wireless signals.

19 is a block diagram illustrating components of a transmitting device 1810 and a receiving device 1820 for carrying out the present invention. Here, the transmitting device and the receiving device may each be a base station or a terminal.

The transmitting device 1810 and the receiving device 1820 are transceivers 1812 and 1822 capable of transmitting or receiving radio signals carrying information and / or data, signals, messages, and the like, and various kinds of information related to communication in a wireless communication system. Is connected to components such as the memory 1813 and 1823, the transceivers 1812 and 1822, and the memory 1813 and 1823 to control the components to control the components. Processors 1811 and 1821 configured to control memory 1813 and 1823 and / or transceivers 1812 and 1822 to perform at least one, respectively. Here, the transceiver may be called a transceiver.

The memory 1813 and 1823 may store a program for processing and controlling the processors 1811 and 1821, and may temporarily store input / output information. The memories 1813 and 1823 may be utilized as buffers.

Processors 1811 and 1821 typically control the overall operation of various modules in a transmitting device or a receiving device. In particular, the processors 1811 and 1821 may perform various control functions for performing the present invention. The processors 1811 and 1821 may also be referred to as controllers, microcontrollers, microprocessors, microcomputers, or the like. The processors 1811 and 1821 may be implemented by hardware or firmware, software, or a combination thereof. When implementing the present invention using hardware, application specific integrated circuits (ASICs) or digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays) may be provided in the processors 1811 and 1821. Meanwhile, when implementing the present invention using firmware or software, the firmware or software may be configured to include a module, a procedure, or a function for performing the functions or operations of the present invention, and configured to perform the present invention. The firmware or software may be provided in the processors 1811 and 1821 or stored in the memories 1813 and 1823 to be driven by the processors 1811 and 1821.

The processor 1811 of the transmitting device 1810 may perform a predetermined encoding and modulation on a signal and / or data to be transmitted to the outside and then transmit the same to the transceiver 1812. For example, the processor 1811 may generate a codeword through demultiplexing, data encoding, scrambling, modulation, and the like, of a data string to be transmitted. The codeword may include information equivalent to a transport block which is a data block provided by the MAC layer. One transport block (TB) may be encoded into one codeword. Each codeword may be transmitted to the receiving device through one or more layers. The transceiver 1812 may include an oscillator for frequency up-convert. The transceiver 1812 may include one or a plurality of transmit antennas.

The signal processing process of the receiving device 1820 may be configured as the inverse of the signal processing process of the transmitting device 1810. Under the control of the processor 1821, the transceiver 1822 of the receiving device 1820 may receive a radio signal transmitted by the transmitting device 1810. The transceiver 1822 may include one or a plurality of receive antennas. The transceiver 1822 may restore the baseband signal by frequency down-converting each of the signals received through the receiving antenna. The transceiver 1822 may include an oscillator for frequency downconversion. The processor 1821 may restore and decode data originally intended to be transmitted by the transmission device 1810 by performing decoding and demodulation on the radio signal received through the reception antenna.

The transceivers 1812 and 1822 may have one or a plurality of antennas. The antenna transmits a signal processed by the transceivers 1812 and 1822 to the outside under the control of the processors 1811 and 1821, or receives a radio signal from the outside to receive the transceivers 1812 and 1822. ) Can be delivered. The antenna may be referred to as an antenna port. Each antenna may correspond to one physical antenna or may be configured by a combination of more than one physical antenna elements. The signal transmitted from each antenna can no longer be resolved by the receiving device 1820. A reference signal (RS) transmitted corresponding to the corresponding antenna defines an antenna viewed from the perspective of the receiving device 1820 and includes whether the channel is a single radio channel from one physical antenna or the antenna. Regardless of whether it is a composite channel from a plurality of physical antenna elements, the receiving device 1820 may enable channel estimation for the antenna. That is, the antenna may be defined such that a channel carrying a symbol on the antenna can be derived from the channel through which another symbol on the same antenna is delivered. A transceiver supporting a multi-input multi-output (MIMO) function for transmitting and receiving data using a plurality of antennas may be connected to two or more antennas.

20 illustrates an example of a signal processing module structure in the transmission device 1810. Here, the signal processing may be performed in a processor of the base station / terminal, such as the processors 1811 and 1821 of FIG. 19.

Referring to FIG. 20, a transmission device 1810 in a terminal or a base station includes a scrambler 301, a modulator 302, a layer mapper 303, an antenna port mapper 304, a resource block mapper 305, and a signal generator 306. ) May be included.

The transmitting device 1810 may transmit one or more codewords. Coded bits in each codeword are scrambled by the scrambler 301 and transmitted on the physical channel. The codeword may be referred to as a data string and may be equivalent to a transport block which is a data block provided by the MAC layer.

The scrambled bits are modulated into complex-valued modulation symbols by the modulator 302. The modulator 302 may modulate the scrambled bits according to a modulation scheme and place them as complex modulation symbols representing positions on signal constellations. There is no restriction on a modulation scheme, and m-Phase Shift Keying (m-PSK) or m-Quadrature Amplitude Modulation (m-QAM) may be used to modulate the encoded data. The modulator may be referred to as a modulation mapper.

The complex modulation symbol may be mapped to one or more transport layers by the layer mapper 303. Complex modulation symbols on each layer may be mapped by antenna port mapper 304 for transmission on the antenna port.

The resource block mapper 305 may map the complex modulation symbol for each antenna port to the appropriate resource element in the virtual resource block allocated for transmission. The resource block mapper may map the virtual resource block to a physical resource block according to an appropriate mapping scheme. The resource block mapper 305 may assign a complex modulation symbol for each antenna port to an appropriate subcarrier and multiplex according to a user.

The signal generator 306 modulates a complex modulation symbol for each antenna port, that is, an antenna specific symbol by a specific modulation scheme, for example, an orthogonal frequency division multiplexing (OFDM) scheme, thereby complex-valued time domain. An OFDM symbol signal can be generated. The signal generator may perform an inverse fast fourier transform (IFFT) on an antenna specific symbol, and a cyclic prefix (CP) may be inserted into a time domain symbol on which the IFFT is performed. The OFDM symbol is transmitted to the receiving apparatus through each transmit antenna through digital-to-analog conversion, frequency upconversion, and the like. The signal generator may include an IFFT module and a CP inserter, a digital-to-analog converter (DAC), a frequency uplink converter, and the like.

21 shows another example of a signal processing module structure in the transmission device 1810. Here, the signal processing may be performed in a processor of the terminal / base station such as the processors 1811 and 1821 of FIG. 19.

Referring to FIG. 21, a transmission device 1810 in a terminal or a base station includes a scrambler 401, a modulator 402, a layer mapper 403, a precoder 404, a resource block mapper 405, and a signal generator 406. It may include.

The transmitting device 1810 may scramble the coded bits in the codeword by the scrambler 401 and transmit the coded bits in one codeword through a physical channel.

The scrambled bits are modulated into complex modulation symbols by modulator 402. The modulator may be arranged as a complex modulation symbol representing a position on a signal constellation by modulating the scrambled bit according to a predetermined modulation scheme. The modulation scheme is not limited, and pi / 2-Binary Phase Shift Keying (pi / 2-BPSK), m-Phase Shift Keying (m-PSK), or m-Quadrature Amplitude Modulation (m-QAM) It can be used for modulation of the encoded data.

The complex modulation symbol may be mapped to one or more transport layers by the layer mapper 403.

Complex modulation symbols on each layer may be precoded by the precoder 404 for transmission on the antenna port. Here, the precoder may perform precoding after performing transform precoding on the complex modulation symbol. Alternatively, the precoder may perform precoding without performing transform precoding. The precoder 404 may process the complex modulation symbol in a MIMO scheme according to a multiplexing antenna to output antenna specific symbols and distribute the antenna specific symbols to the corresponding resource block mapper 405. The output z of the precoder 404 can be obtained by multiplying the output y of the layer mapper 403 by a precoding matrix W of N × M. Where N is the number of antenna ports and M is the number of layers.

The resource block mapper 405 maps the demodulation modulation symbol for each antenna port to the appropriate resource element in the virtual resource block allocated for transmission.

The RB mapper 405 may assign a complex modulation symbol to an appropriate subcarrier and multiplex it according to a user.

The signal generator 406 may generate a complex-valued time domain (OFDM) orthogonal frequency division multiplexing (OFDM) symbol signal by modulating the complex modulation symbol in a specific modulation scheme, for example, the OFDM scheme. The signal generator 406 may perform an inverse fast fourier transform (IFFT) on an antenna specific symbol, and a cyclic prefix (CP) may be inserted into a time domain symbol on which the IFFT is performed. The OFDM symbol is transmitted to the receiving apparatus through each transmit antenna through digital-to-analog conversion, frequency upconversion, and the like. The signal generator 406 may include an IFFT module and a CP inserter, a digital-to-analog converter (DAC), a frequency uplink converter, and the like.

The signal processing of the receiver 1820 may be configured as the inverse of the signal processing of the transmitter. In detail, the processor 1821 of the receiver 1820 performs decoding and demodulation on the radio signal received through the antenna port (s) of the transceiver 1822 from the outside. The receiving device 1820 may include a plurality of multiple receiving antennas, and each of the signals received through the receiving antenna is restored to a baseband signal and then transmitted by the transmitting device 1810 through multiplexing and MIMO demodulation. The data sequence is restored. The receiver 1820 may include a signal recoverer for recovering a received signal into a baseband signal, a multiplexer for combining and multiplexing the received processed signals, and a channel demodulator for demodulating the multiplexed signal sequence with a corresponding codeword. . The signal reconstructor, multiplexer, and channel demodulator may be configured as one integrated module or each independent module for performing their functions. More specifically, the signal reconstructor is an analog-to-digital converter (ADC) for converting an analog signal into a digital signal, a CP remover for removing a CP from the digital signal, and a fast fourier transform (FFT) to the signal from which the CP is removed. FFT module for outputting a frequency domain symbol by applying a, and may include a resource element demapper (equalizer) to restore the frequency domain symbol to an antenna-specific symbol (equalizer). The antenna specific symbol is restored to a transmission layer by a multiplexer, and the transmission layer is restored to a codeword intended to be transmitted by a transmitting device by a channel demodulator.

22 illustrates an example of a wireless communication device according to an embodiment of the present invention.

Referring to FIG. 22, a wireless communication device, for example, a terminal may include a processor 2310, a transceiver 2335, a power management module 2305, an antenna, such as a digital signal processor (DSP) or a microprocessor. 2340, battery 2355, display 2315, keypad 2320, GPS (Global Positioning System) chip 2360, sensor 2365, memory 2330, SIM (Subscriber Identification Module) card 2325, At least one of the speaker 2345 and the microphone 2350 may be included. There may be a plurality of antennas and processors.

The processor 2310 may implement the functions, procedures, and methods described herein. The processor 2310 of FIG. 22 may be the processors 1811 and 1821 of FIG. 19.

The memory 2330 is connected to the processor 2310 and stores information related to the operation of the processor. The memory may be located inside or outside the processor and may be connected to the processor through various technologies such as a wired connection or a wireless connection. The memory 2330 of FIG. 22 may be the memories 1813 and 1823 of FIG. 19.

The user may input various kinds of information such as a telephone number using various techniques such as pressing a button of the keypad 2320 or activating a sound using the microphone 2350. The processor 2310 may perform appropriate functions such as receiving and processing user information, calling an input telephone number, and the like. In some scenarios, data may be retrieved from SIM card 2325 or memory 2330 to perform the appropriate function. In some scenarios, the processor 2310 may display various kinds of information and data on the display 2315 for the convenience of the user.

The transceiver 2335 is connected to the processor 2310 to transmit and / or receive a radio signal such as a radio frequency (RF) signal. The processor may control the transceiver to initiate communication or to transmit a wireless signal including various kinds of information or data such as voice communication data. The transceiver includes a transmitter and a receiver for transmitting and receiving wireless signals. Antenna 2340 may facilitate the transmission and reception of wireless signals. In some implementations, the transceiver can forward and convert the signal to baseband frequency for processing by the processor upon receiving the wireless signal. The processed signal may be processed by various techniques, such as being converted into audible or readable information to be output through the speaker 2345. The transceiver of FIG. 22 may be the transceivers 1812 and 1822 of FIG. 19.

Although not shown in FIG. 22, various components such as a camera and a universal serial bus (USB) port may be additionally included in the terminal. For example, the camera may be connected to the processor 2310.

22 is only one implementation of the terminal, and the implementation is not limited thereto. The terminal does not necessarily need to include all the elements of FIG. 22. That is, some components, for example, the keypad 2320, the GPS (Global Positioning System) chip 2360, the sensor 2365, the SIM card 2325, etc. may not be essential elements, and in this case, are not included in the terminal. It may not.

23 shows an example of a 5G usage scenario to which the technical features of the present invention can be applied. The 5G usage scenario shown in FIG. 23 is merely exemplary, and the technical features of the present invention may be applied to other 5G usage scenarios not shown in FIG. 23.

Referring to FIG. 23, three major requirement areas of 5G are (1) enhanced mobile broadband (eMBB) area, (2) massive machine type communication (mMTC) area, and ( 3) ultra-reliable and low latency communications (URLLC). Some use cases may require multiple areas for optimization, while other use cases may focus on only one key performance indicator (KPI). 5G supports these various use cases in a flexible and reliable way.

eMBB focuses on improving data rate, latency, user density, overall capacity and coverage of mobile broadband access. eMBB aims at throughput of around 10Gbps. eMBB goes far beyond basic mobile Internet access and covers media and entertainment applications in rich interactive work, cloud or augmented reality. Data is one of the key drivers of 5G and may not see dedicated voice services for the first time in the 5G era. In 5G, voice is expected to be treated as an application simply using the data connection provided by the communication system. The main reason for the increased traffic volume is the increase in content size and the increase in the number of applications requiring high data rates. Streaming services (audio and video), interactive video, and mobile Internet connections will become more popular as more devices connect to the Internet. Many of these applications require always-on connectivity to push real-time information and notifications to the user. Cloud storage and applications are growing rapidly in mobile communication platforms, which can be applied to both work and entertainment. Cloud storage is a special use case that drives the growth of uplink data rates. 5G is also used for remote tasks in the cloud and requires much lower end-to-end delays to maintain a good user experience when tactile interfaces are used. In entertainment, for example, cloud gaming and video streaming are another key factor in increasing the need for mobile broadband capabilities. Entertainment is essential in smartphones and tablets anywhere, including in high mobility environments such as trains, cars and airplanes. Another use case is augmented reality and information retrieval for entertainment. Here, augmented reality requires very low latency and instantaneous amount of data.

The mMTC is designed to enable communication between a large number of low-cost devices powered by batteries and to support applications such as smart metering, logistics, field and body sensors. The mMTC targets 10 years of battery and / or about 1 million devices per km2. The mMTC enables seamless connection of embedded sensors in all applications and is one of the most anticipated 5G use cases. Potentially, 2020 IoT devices are expected to reach 20 billion. Industrial IoT is one of the areas where 5G plays a major role in enabling smart cities, asset tracking, smart utilities, agriculture and security infrastructure.

URLLC enables devices and machines to communicate very reliably and with very low latency and high availability, making them ideal for vehicle communications, industrial control, factory automation, telesurgery, smart grid and public safety applications. URLLC aims for a delay of around 1ms. URLLC includes new services that will transform the industry through ultra-reliable / low-latency links such as remote control of key infrastructure and autonomous vehicles. The level of reliability and latency is essential for smart grid control, industrial automation, robotics, drone control and coordination.

Next, a plurality of usage examples included in the triangle of FIG. 23 will be described in more detail.

5G can complement fiber-to-the-home (FTTH) and cable-based broadband (or DOCSIS) as a means of providing streams that are rated at hundreds of megabits per second to gigabits per second. This high speed may be required to deliver TVs at resolutions of 4K or higher (6K, 8K and higher) as well as virtual reality (VR) and augmented reality (AR). VR and AR applications include nearly immersive sporting events. Certain applications may require special network settings. For example, in a VR game, the game company may need to integrate the core server with the network operator's edge network server to minimize latency.

Automotive is expected to be an important new driver for 5G, with many uses for mobile communications to vehicles. For example, entertainment for passengers demands both high capacity and high mobile broadband at the same time. This is because future users continue to expect high quality connections regardless of their location and speed. Another use of the automotive sector is augmented reality dashboards. The augmented reality contrast board allows the driver to identify objects in the dark above what they are looking through through the front window. The augmented reality dashboard superimposes information that tells the driver about the distance and movement of the object. In the future, wireless modules enable communication between vehicles, the exchange of information between the vehicle and the supporting infrastructure, and the exchange of information between the vehicle and other connected devices (eg, devices carried by pedestrians). The safety system guides alternative courses of action to help drivers drive safer, reducing the risk of an accident. The next step will be a remote controlled vehicle or an autonomous vehicle. This requires very reliable and very fast communication between different autonomous vehicles and / or between cars and infrastructure. In the future, autonomous vehicles will perform all driving activities and allow drivers to focus on traffic anomalies that the vehicle itself cannot identify. The technical requirements of autonomous vehicles require ultra-low latency and ultrafast reliability to increase traffic safety to an unachievable level.

Smart cities and smart homes, referred to as smart societies, will be embedded into high-density wireless sensor networks. The distributed network of intelligent sensors will identify the conditions for cost and energy efficient maintenance of the city or home. Similar settings can be made for each hypothesis. Temperature sensors, window and heating controllers, burglar alarms and appliances are all connected wirelessly. Many of these sensors typically require low data rates, low power and low cost. However, for example, real-time HD video may be required in certain types of devices for surveillance.

The consumption and distribution of energy, including heat or gas, is highly decentralized, requiring automated control of distributed sensor networks. Smart grids interconnect these sensors using digital information and communication technologies to gather information and act accordingly. This information can include the behavior of suppliers and consumers, allowing smart grids to improve the distribution of fuels such as electricity in efficiency, reliability, economics, sustainability of production, and in an automated manner. Smart Grid can be viewed as another sensor network with low latency.

The health sector has many applications that can benefit from mobile communications. The communication system may support telemedicine that provides clinical care from a distance. This can help reduce barriers to distance and improve access to health care that is not consistently available in remote rural areas. It is also used to save lives in critical care and emergencies. Mobile communication based wireless sensor networks may provide remote monitoring and sensors for parameters such as heart rate and blood pressure.

Wireless and mobile communications are becoming increasingly important in industrial applications. Wiring is expensive to install and maintain. Thus, the possibility of replacing the cable with a reconfigurable wireless link is an attractive opportunity in many industries. However, achieving this requires that the wireless connection operates with similar cable delay, reliability, and capacity, and that management is simplified. Low latency and very low error probability are new requirements that need to be connected in 5G.

Logistics and freight tracking is an important use case for mobile communications that enables the tracking of inventory and packages from anywhere using a location-based information system. The use of logistics and freight tracking typically requires low data rates but requires wide range and reliable location information.

Claims (15)

1. A method for receiving uplink (UL) / downlink (DL) configuration information performed by a terminal in a wireless communication system,

   Perform SSB measurements on a plurality of synchronization signal blocks (SSBs) having different beam directions,

   Transmitting SSB measurement information to a network, wherein the SSB measurement information indicates a best SSB selected by the terminal based on the SSB measurement among the plurality of SSBs, and

   Receiving the UL / DL configuration information from the network,

   The UL / DL configuration information is group-common,

   The group is characterized in that the best SSB is a set of the same terminal.
2. The method of claim 1,

   The terminal receives the UL / DL configuration information based on a control resource set (CORESET) and a search space (SS) set,

   At least one of the CORESET and the SS set is group-commonly set.
3. The method of claim 2,

   Wherein the CORESET and the SS set are each group-commonly set.
4. The method of claim 1,

   The terminal receives the control resource configuration information, the control resource configuration information informs the setting for the CORESET per group and the SS set per group,

   And the terminal monitors a group other than a group to which the terminal belongs based on the control resource configuration information.
5. The method of claim 4, wherein

   The control resource configuration information is transmitted via radio resource control (RRC) signaling.
6. The method of claim 4, wherein

   The monitoring is characterized in that for the group with the largest interference to the terminal.
7. The method of claim 1,

   The terminal performs uplink measurement for uplink transmission of another terminal,

   The terminal further includes transmitting uplink measurement information for the uplink measurement to a network,

   The UL / DL configuration information is determined by the network based on the SSB measurement information and the uplink measurement information.
8. The method of claim 7, wherein

   The uplink transmission is performed based on a specific frequency band allocated per terminal in a specific time interval.
9. The method of claim 1,

   The SSB measurement is characterized in that the at least one of the serving cell of the terminal, the neighboring cell of the serving cell.
10. A method for transmitting uplink (UL) / downlink (DL) configuration information performed by a base station in a wireless communication system,

    Transmits a plurality of synchronization signal blocks (SSBs) having different beam directions,

    Receiving SSB measurement information from a terminal, wherein the SSB measurement information includes information on a best synchronization signal block (SSB) selected by the terminal among the plurality of SSBs; and

    Transmit UL / DL configuration information to the terminal based on the SSB measurement information,

    The UL / DL configuration information is group-common,

    The group is characterized in that the best SSB is a set of the same terminal.
11. The method of claim 10,

    The base station transmits the UL / DL configuration information based on a control resource set (CORESET) and a search space (SS) set,

    At least one of the CORESET and the SS set is group-commonly set.
12. The method of claim 10,

    The base station transmits control resource configuration information to another base station, the control resource configuration information informs the setting for the CORESET per group and the SS set per group,

    The control resource configuration information is transmitted over the air interface between the base station and the other base station.
13. The method of claim 10,

    The base station transmits group information to another base station,

    The group information includes information on groups controlled by the base station.
14. UE (User Equipment; UE),

    A transceiver for transmitting and receiving wireless signals; And

    And a processor operating in conjunction with the transceiver;

    Perform SSB measurements on a plurality of synchronization signal blocks (SSBs) having different beam directions,

    Transmitting SSB measurement information to a network, wherein the SSB measurement information indicates a best SSB selected by the terminal based on the SSB measurement among the plurality of SSBs, and

    Receiving the UL / DL configuration information from the network,

    The UL / DL configuration information is group-common,

    The group is characterized in that the best SSB is a set of the same terminal.
15. The method of claim 14,

    The terminal communicating with at least one of a mobile terminal, the network, and an autonomous vehicle other than the terminal.

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