KR20180108365A - Method and apparatus for beam recovery procedure when single/multi-bpl is monitored in a multi-beam based systems - Google Patents

Abstract

The present disclosure relates to a 5G or pre-5G communication system for supporting a higher data transmission rate than a 4G communication system such as LTE. The present disclosure can be applied to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, security- and safety-related services, etc.) based on 5G communication technology and IoT-related technology. According to the present invention, disclosed is a base station terminal operation for beam recovery when a single/multi BPL is operated in a multi-beam based system. According to an embodiment of the present invention, provided are a method and an apparatus for operating the same, in a method for processing a control signal in a wireless communication system comprising the steps of: receiving a first control signal transmitted from a base station; processing the received first control signal; and transmitting a second control signal generated based on the processing to the base station.

Description

METHOD AND APPARATUS FOR BEAM RECOVERY PROCEDURE WHEN SINGLE / MULTI-BPL IS MONITORED IN A MULTI-BEAM BASED SYSTEMS FOR BEAM RECOVERY USING SINGLE / MULTIBLE BPL IN A MULTI-

The present invention relates to a base station terminal operation for beam recovery when monitoring a single / multiple BPL for control channel transmission / reception in a beamforming system.

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

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

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

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

On the other hand, the Internet is evolving into an Internet of Things (IoT) network in which information is exchanged between distributed components such as objects in a human-centered connection network where humans generate and consume information. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired / wireless communication, network infrastructure, service interface technology and security technology are required. In recent years, sensor network, machine to machine , M2M), and MTC (Machine Type Communication). In the IoT environment, an intelligent IT (Internet Technology) service can be provided that collects and analyzes data generated from connected objects to create new value in human life. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, and advanced medical service through fusion of existing information technology . ≪ / RTI >

Accordingly, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as a sensor network, a machine to machine (M2M), and a machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antennas It is. The application of the cloud RAN as the big data processing technology described above is an example of the convergence of 5G technology and IoT technology.

Recently, according to the development of LTE (Long Term Evolution) and LTE-Advanced, researches on a technique of operating a single / multi BPL in a multi-beam based system have been actively performed, and in particular, a base station terminal operation for beam recovery may be required . In this case, when a single / multi BPL is operated in a multi-beam based system, a base station terminal operation for beam recovery is required.

An embodiment of the present invention aims at providing a beam recovery operation when monitoring a single / multiple BPL for control channel transmission / reception.

According to an aspect of the present invention, there is provided a method of processing a control signal in a wireless communication system, the method comprising: receiving a first control signal transmitted from a base station; Processing the received first control signal; And transmitting the second control signal generated based on the process to the base station.

The beam recovery method according to the embodiment of the present invention can define the beam recovery operation of the base station and the terminal when monitoring a single / multiple BPL for control channel transmission / reception in a multi-beam based system.

1a. Beam recovery operation
1b. When a dedicate sequence is assigned for each RR and SR for each UE,
1C. Base station-terminal operation when assigning single dedicate sequence for RR / SR for each terminal 1
1d. When a single dedicate sequence is allocated for RR / SR for each terminal, the base station-terminal operation 2
1E. Dedicate sequence allocation for SR use and base station-terminal operation when dedicate sequence is not allocated for recovery
1F. Dedicated sequence allocation for recovery purpose and base station-terminal operation when dedicate sequence is not allocated for SR use
1g. If a periodic DL beam management RS (cell-specific or UE-specific) is transmitted that is only capable of Rough beam association, or if periodic beam management RS is not transmitted,
1h. When base station end beam correspondence is not established, base station-terminal operation for beam recovery request
1I. Selection of robust beam management mode according to the number of simultaneously receivable beams
1J. Robust beam management mode selection and measurement metric selection according to the number of simultaneously receivable beams
1k. Select measurement metric in Robust beam management mode 2
Fig. When the terminal performs mode 1, the overall beam recovery request procedure
1m. A BPL setup procedure for multiple BPL monitoring between base stations and terminals to perform multiple BPL monitoring after initial connection of a terminal when the terminal performs mode 1
1n. When the terminal performs Mode 1, and performs RR for B BPL in reporting due to a base station request during A BPL connection
Fig. When the UE performs Mode 1 and performs RR using PRACH-like RR region for A / B BPL during A BPL connection,
1P. When the UE performs mode 1 and performs RR using PRACH-like RR region for A / B BPL during A BPL connection,
Fig. When the terminal performs mode 1, when the UE performs the RR for the BPL while performing the A RPL,
Fig. When the terminal performs mode 1, beam failure RR triggering Condition 2 is applied to the system, and when the PRACH-like RR region is used for RR for A / B BPL during A BPL connection,
1s. When the terminal performs mode 1, beam failure RR triggering When condition 2 is applied to the system, and when performing PRACH-like RR region using RR for A / B BPL during A BPL connection,
2 is a diagram illustrating a configuration of a base station according to the present invention.
3 is a diagram illustrating a configuration of a terminal according to the present invention.

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

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

A beam pair link (BPL) for transmitting downlink (DL) and uplink (uplink) control / data channels between base stations and terminals in a multi-beam based system is designated . BPL may refer to a base-to-end beam pair for a composite beam (or wide beam) or a fine beam (or narrow beam) selected through a beam management RS. In this case, the BPL used to transmit the control channel and the BPL used to transmit the data channel may be different from each other in view of one terminal. In addition, base station transmit / receive beam direction and / or terminal transmit / receive beam direction for UL and DL communications constituting the BPL between the base station and the terminal may be differently designated according to the beam correspondence at the base station and the terminal end have. In addition, the system is capable of monitoring multiple BPLs for control / data channel communication for robust beam management. In particular, operating a plurality of BPLs for the control channel makes it possible for the terminal not to lose the most communicable beam BPL.

If the single / multiple BPL between the base station and the terminal is unavailable (beam failure status), the UE is synchronized with the network but has lost the beam link capable of communicating with the base station. (beam recovery). Beam failure can be recognized by the terminal and can be continuously measured through a reference signal (RS) configured through the MIB / SIB (minimum SI) or RRC signal at the base station to detect beam failure have. For example, when the measured value through RS drops below a certain threshold, the terminal can recognize a failure (for a minimum DL BPL) for that BPL. RRC includes both cell-specific or UE-specific RRCs. The RS for measuring beam failure may be cell-specific or UE-specific or UE-group-specific. For example, the RS for measuring beam failure can be a synchronous signal, and the synchronous signal is a composite beam or wide beam composed of several narrow beams. As another example, an RS for measuring beam failure may be an RS mapped to each of all the fine beams or narrow beams that the base station uses to cover the entire service area. Here, the term fine beam or narrow beam refers to a beam used by a base station to transmit a control channel and / or a data channel to a terminal. The overall base station-terminal operation for beam recovery can be represented as in FIG.

In addition to the configuration for the above-described RS for beam failure measurement, the BS may transmit a configuration (frequency / time information) of a resource capable of performing beam recovery through one or more signaling of MIB / SIB / RRC / , sequence for beam recovery (terminal dedicate or redundant allocation to multiple terminals), parameters to be used in measuring beam failure (threshold for determining beam failure, etc.).

Below is an example of base station / terminal operation for beam recovery according to various situations.

[Base Station / Terminal Operation According to Recovery Resource]

After the terminal detects a beam failure for a particular BPL (s), it can send a beam recovery request to the base station if there is a viable alternate BPL. The UE can not transmit the beam recovery request (RR) through the UL control channel or the data channel communicated to the BPL that has been used previously because the BPL (s) that have been used previously are no longer valid. The UE can perform the RR in the area where the base station sweeps multiple beams across the service area all the way, such as the RACH resource allocated for performing random access (RA) by the initial access terminal. In a system in which base station beam correspondence is established, the UE can transmit an RR message to an RR resource in which the corresponding beam performs reception based on the preferred beam information obtained through the beam management RS. Beam management RS may be the same as or different from RS for beam failure measurement.

Situation 1) For recovery purposes RACH  When using other resources: Recovery / SR resource sharing

It is possible to use resources other than the defined frequency / time / sequence resources for the RA terminal for beam recovery purposes. In particular, frequency / time / sequence resources defined for beam recovery purposes may be resources that are allowed to transmit scheduling requests (SRs) as well as recovery requests (RRs). At this time, the frequency / time resources are shared for the RR and SR, but detailed examples of various alternatives depending on how to allocate the sequences are described.

Alt 1. RR and SR by terminal Each  Dedication sequence assignment (non-contention based recovery / SR)

It is possible to assign a dedicate sequence for each RR application and SR application for each terminal. In this case, it is possible to perform RR and SR without contention among a plurality of users, even if all the frequency / time resources for RR and SR are shared. FIG. 1B shows a detailed embodiment when beam correspondence is satisfied at a base station / terminal. The base station assigns a dedicate sequence for RR and SR to the UE through Msg 4 during the RA process or through UE-specific RRC signaling during initial access. Then, the base station performs resource configuration necessary for RR and SR through RRC signaling.

The UE can then perform RR on the RR / SR resource using the assigned RR sequence. The BS receiving the request may transmit an UL grant, and at this time, the UE may trigger reporting of the preferred BPL information to be newly updated. Also, the number of preferred BPLs to be reported to the UE may be indicated. Then, the UE can report information on the BPL (s) to be newly updated through UCI or MAC-CE. This information may include beam (or BPL) ID or port number of beam management RS, RSRP information for the beam (or BPL), and so on. The base station then conveys the confirmation information for the changed BPL (s). From this point on, the BPL (s) newly designated instead of the existing BPL (s) established between the base station and the terminal are recognized as both the base station and the terminal, and communication is started. If the RR resource and each BPL are associated (that is, information on the preferred BPL is clearly conveyed according to which location (eg, OFDM symbol) of the UE has performed the RR) When the BS only operates a single BPL for the UE, the UL grant of the BS of FIG. 1B and the process of reporting the BPL (s) information to be updated by the MS may be omitted.

Alternatively, the UE can perform the SR in the RR / SR resource using the assigned SR sequence. The base station receiving the SR sends an UL grant to the terminal. The UE may transmit a BSR (buffer status report) through the MAC-CE or directly transmit data when the amount of data is very small.

In this embodiment, the same sequence is allocated to the UE for SR and RR purposes, and dedicate frequency / time resources to be used for SR and RR request transmission are divided and allocated within a defined interval for SR and RR purposes The same can be applied. At this time, the base station will allocate dedicate frequency / time resources instead of assigning dedicate sequence allocation information to the terminal.

Alt 2. Non-contention based recovery (SR) for RR / SR by terminal

The system may assign a common dedicate sequence for RR and SR for each terminal. In this case, since the base station receiving the request from the resource for RR / SR does not know the purpose of the UE clearly, the UE needs to clarify it later. 1C and FIG. 1D, when the beam correspondence is satisfied at the base station / terminal, a detailed embodiment is shown.

The base station allocates a single sequence for RR / SR through Msg 4 or UE-specific RRC signaling in the RA process at initial access. Then, the base station performs resource configuration necessary for RR and SR through RRC signaling. Then, when the UE desires to perform RR or SR, it performs RR or SR using a sequence allocated from the resources for RR / SR. The base station then gives the UL grant. Referring to FIG. 1C, a UE to which the RR is to perform an RL is configured to transmit information about a new BPL (s) using a MAC-CE (a beam (or BPL) ID corresponding to a preferred BPL or a beam management RS port Number, the RSRP information of the corresponding beam (or BPL), etc.), and a terminal performing the SR can directly transmit the BSR or data. Since the BPL (s) information or the BSR will be formatted and classified, the BS can clearly know the destination of the request sequence through the MAC-CE of the UE. When the UE finds that it has transmitted a request sequence for RR through MAC-CE, the BS can confirm information about the updated BPL (s), and the UE transmits a request sequence for SR through MAC-CE The base station can allocate resources for the terminal to send data. Referring to FIG. 1D, a UE to perform RR can transmit BPL (s) information or BPL (s) information and BSR together through a UCI. If the information sent from the UE includes only BPL (s) It can be known that the reason for transmitting the request sequence is the RR. If the information transmitted from the UE includes only the BPL (s) information and the BSR or BSR, it can be seen that the reason for transmitting the request sequence is the SR.

In this embodiment, even when the same sequence is allocated to the UE for the SR and RR purposes and the same dedicate frequency / time resources to be used for SR and RR request transmission are allocated in the interval defined for SR and RR use The same can be applied. At this time, the base station will allocate dedicate frequency / time resources instead of assigning dedicate sequence allocation information to the terminal.

Alt 3. Only one of RR / SR assigned to terminal is assigned dedicate sequence

Lower 3-1. Dedicate sequence assignment for SR use and dedicate sequence unallocation for RR use (Contention based recovery)

The system allocates a dedicate sequence for each terminal for SR use and does not allocate a dedicate sequence for recovery purpose. In this case, the sequences that can be used for the entire RR and SR purposes in the standard should be divided into two sets for the RR or SR. That is, a sequence is contained only in one set of two sets. The SR sequence allocated to the UE is selected in the SR sequence set, and all UEs in the cell can use the RR sequence by randomly selecting the sequence in the RR sequence set. In this case, even if the frequency / time resources for RR and SR are the same, contention does not occur between terminals for SR and RR use. FIG. 1E shows a detailed embodiment when beam correspondence is satisfied at a base station / terminal.

The base station selects and allocates a sequence for SR from the sequence set for SR through Msg4 or UE-specific RRC at initial connection of the UE. Then, the base station performs resource configuration necessary for RR and SR through RRC signaling. Then, the UE selects a sequence randomly among the RR sequence sets and performs RR. The base station sends an UL grant for the RR, and the DCI for receiving the UL grant is scrambled with a specific RNTI. This particular RNTI is related to the RR sequence used by the terminal. The UE receiving the UL grant transmits new BPL (s) information and C-RNTI to be updated via the PUSCH. Since the UE already has a C-RNTI since it is connected to the network, if there is a user using the same RR sequence in the same RR resource, a C-RNTI is transmitted for the purpose of performing contention resolution . The base station then sends the BPL (s) confirmation information to the terminal along with the contention resolution message.

In this embodiment, the same sequence is assigned to the UE for the SR and RR purposes, and dedicate frequency / time resources to be used for transmission of the SR request are separately allocated and defined in the interval defined for SR and RR purposes. The same can be applied to the case of not allocating dedicate frequency / time resources for transmission (request transmission by randomly selecting a terminal). In this case, it is necessary to give information on whether the area for SR and RR use is differentiated in the area where the base station is initially designated for SR and RR use.

Alt 3-2. Assignment of dedicate sequence for RR use and deduction sequence unassignment for SR use (Contention based SR)

The system may allocate a dedicate sequence for each RR purpose and not a dedicate sequence for SR. In this case, the sequences that can be used for the entire RR and SR purposes in the standard should be divided into two sets for the RR or SR. That is, a sequence is contained only in one set of two sets. The RR sequence allocated to the UE is selected in the RR sequence set, and all UEs in the cell can randomly select a sequence from the SR sequence set and use it for the SR. In this case, even if the frequency / time resources for RR and SR are the same, contention does not occur between terminals for SR and RR use. FIG. 1F shows a detailed embodiment when beam correspondence is satisfied at a base station / terminal.

The base station selects and allocates an RR sequence in the RR sequence set via Msg4 or UE-specific RRC in initial connection of the UE. Then, the base station performs resource configuration necessary for RR and SR through RRC signaling. After that, the terminal randomly selects a sequence among the sequence set for SR and performs SR. The base station sends an UL grant for the SR, and the DCI for receiving the UL grant is scrambled to a specific RNTI. This particular RNTI is related to the SR sequence used by the terminal. The UE receiving the UL grant transmits the BSR information and the C-RNTI through the PUSCH. Since the UE already has a C-RNTI because it is connected to the network, if there is a user using the same SR sequence in the same SR resource, the C-RNTI is transmitted for the purpose of performing contention resolution. . The base station then allocates resources for transmitting UL data with the contention resolution message.

In this embodiment, the same sequence is assigned to the UE for the SR and RR purposes, the dedicate frequency / time resources to be used for the RR request transmission are separately allocated and defined in the interval defined for SR and RR use, The same can be applied to the case of not allocating dedicate frequency / time resources for transmission (request transmission by randomly selecting a terminal). In this case, it is necessary to give information on whether the area for SR and RR use is differentiated in the area where the base station is initially designated for SR and RR use.

Situation 2) For Recovery RACH  When using resources

The system can use the RA / RR frequency / time / sequence resources for the initial access terminals as the same resource. In this case, It is possible to clarify whether the terminal is requesting RR or initial access terminal through CE or DCI.

[Beam failure measurement RS / RTI > < RTI ID = 0.0 &

In order to select the BPL between the base station and the terminal, the terminal may select a rough beam (composite beam or wide beam) using a synchronization signal, or a beam (fine beam or narrow beam) It is also possible to select a fine beam based on the RS corresponding to the reference value. This may vary depending on the base station operation.

Situation 1) Periodic DL beam management with fine beam association RS  (cell-specific or UE -specific) is transmitted

If a DL beam management RS capable of fine beam selection is periodically transmitted, the terminal can continuously monitor the BPL (s) that can be changed upon occurrence of a beam failure through the RS. If beam correspondence is established in the base station / terminal, the base station / terminal operation as in the above-mentioned alternatives can be performed in the [base station / terminal operation according to the recovery resource] in this situation.

Situation 2) Periodic DL beam management with only Rough beam association RS  (cell-specific or UE -specific) is transmitted, or periodic beam management RS Is not transmitted

If the DL beam management RS capable of fine beam selection is not periodically transmitted or only the DL beam management RS capable of only rough beam association is periodically transmitted (e.g., a synchronization signal), a base station-terminal operation different from the above- Should be defined. The BPL (s) of the terminal in the beam recovery request process must be updated with respect to the fine beam by the beam recovery request process since the BPL for control and / The CSI-RS must be transmitted in order to select and report it. When the beam correspondence at the base station / terminal is established, an example of the RR procedure is shown in FIG. Compared with the RR-related base station-terminal operation of FIG. 1E, when the base station receives the RR from the UE, it can activate the CSI-RS transmission configured through the RRC when granting the UL grant. The UE can select a location in the resource for RR corresponding to the BPL of the preferred rough beam obtained by using the synchronization signal, etc. (the base station transmits with the composite beam) at the time of performing the RR. It is possible to find a rough beam preferred by the UE based on the location of the RR resource. Therefore, the transmission beam of the base station transmitted for the fine beam selection of the UE in the corresponding CSI-RS resource may be narrow beams constituting the corresponding rough beam. After the UL grant, the BS transmits the activated CSI-RS, and the MS can update the BPL in which the beam failure occurs by selecting and reporting the port number (s) of the preferred CSI-RS . In this case, FIG. 1G is an embodiment of a system for operating a contention-based RR as shown in FIG. 1E, in which a terminal transmits a C-RNTI together with selected BPL (s) information to help the base station perform contention resolution . 1G, for example, in addition to the embodiment shown in FIG. 1G, when it is possible to distinguish the RR object from the sequence transmitted to the RR resource, the base station activates the CSI-RS when transmitting the UL grant after receiving the RR sequence Operation may be included.

In another embodiment, when the BS receiving the RR transmits the UL grant, the UE does not include the CSI-RS activation information, and the UE can then report the preferred rough beam through the DCI or the MAC-CE. It is also possible to activate the CSI-RS via a DCI (transmitted in a rough beam or a composite beam) and the terminal to select a new BPL (with fine beam) based on the CSI-RS.

[Base station / terminal operation when beam correspondence is not established at the base station]

The lack of beam correspondence at the base station means that the beam direction used for DL signal transmission at the base station may not be the same as the beam direction used for UL signal reception. In this case, the terminal can select the transmission beam of the preferred base station DL through the RS for use in beam management (a synchronous signal transmitted through a composite beam or a fine beam association), but when the RR is performed, The RR sequence should be transmitted at the RR resource location corresponding to the base station receive beam in all directions. When the MS transmits the RB transmission information to the BS, the BS can use the DL transmission beam in the corresponding direction when transmitting the response to the RR of the MS. When the MS transmits the RR, there are two methods for transmitting the DL transmission beam information of the BS. The first method is to include the information in the sequence used in the RR. This method can be used when RR and SR purpose sequences or time / frequency resources for RR and SR are separated. Or to share sequences or time / frequency resources for RA and RR. The second scheme is to separate resources according to the base station DL transmission beam in the RR resource. If the resource is configured as described above, the UE can transmit the RR to the base station by transmitting the RR at a location corresponding to the DL RB-transmitted DL transmission beam.

As described above, when beam correspondence is not established at the base station end, the transmission / reception beam directions for communicating with the terminal may be different. Thus, a DL transmission beam for communicating with a specific terminal can be detected at the terminal RR, When the UL information is transmitted, it is necessary to find out the beam to receive the UL information. In the beam recovery request process, it is required to transmit the SRS to the UE, and the BS selects a receive beam to be used in receiving the UL signal transmitted from the UE. FIG. 1H shows a detailed embodiment when the base station end beam correspondence is not established and the beam management RS for fine beam association is periodically transmitted. The base station can inform the terminal whether beam correspondence is established at the base station through the minimum SI. If the beam correspondence is not established, when the UE sends UL information, it selects the beam to receive the UL information, and if the UE grants the UL grant after receiving the RR, And may also request the terminal to transmit the SRS. The UE having received the UL grant can confirm that the base station DL transmission beam included in the UL grant is correct through the UCI and then transmits the SRS requested by the base station so that when the base station transmits the UL information of the UE, Beam can be selected.

1H, in addition to the embodiment shown in FIG. 1H, when it is possible to distinguish the RR object from the sequence transmitted to the RR resource, when the base station transmits the UL grant after receiving the RR sequence, the terminal transmits the SRS Commanding operation may be included.

[Multiplex for control channel transmission BPL  Base station / terminal operation in operation]

For robust communication, a system for monitoring multiple BPLs for base station-to-terminal control channel transmission can be considered. Such robust beam management can be applied to all UEs in a cell or only to some UEs.

<Multi- PDCCH  monitoring mode  And measurement metric>

The robust beam management method of the base station can be selected according to the number of beams that the terminal can simultaneously receive. As shown in FIG. 1I, if the UE can receive only one beam at a time according to the information received through the capacity negotiation after the RA, the BS can select and assign the robust beam management mode 0 or 1 to the UE. Alternatively, if the terminal is capable of receiving multiple beams at a time, the base station may select one of the robust beam management modes 0/1/2. Robust beam management mode is a mode in which a terminal receives one control beam at a time among multi-BPLs. In mode 1, a terminal receives one beam at a time of a multi-BPL, candidate BPL is monitored at different frequencies, and mode 2 is a mode in which the UE receives beams corresponding to several BPLs at a time. Mode 1 receives multiple monitoring BPLs in different OFDM symbols, and mode 2 receives multiple monitoring BPLs in one OFDM symbol. The terminal needs to perform measurement based on a specific RS to distinguish beam failures of BPLs while monitoring BPL involved in robust beam management. In this case, the RS for distinguishing the beam failure at the terminal may be a composite beam including a beam for transmitting a control channel at the base station, or an RS corresponding to a BPL associated with a beam for transmitting a control channel at the base station. In particular, in Mode 2, the method of calculating the RS in the above-described manner may be variously defined in order to distinguish the beam failure when the UE performs measurement, and this calculation method is referred to as a measurement metric. The measurement metric 0 means that a quality measurement is performed in a single RS for each BPL, and the measurement metric 1 indicates that a plurality of BPLs Means performing a quality measurement on a single RS. According to another embodiment, the system can support only modes 1 and 2 except for mode 0, in which mode 1 and 2 can be selected according to the terminal capa. This is shown in Figure 1j.

<Beam failure recovery request (RR) channel>

If the system performs single / multiple BPL transmissions for the control channel (not for multiple BPLs), a PRACH-like channel and PUCCH that the base station sweeps in all directions in order to perform the RR for the failed BPL are utilized . What channel the base station will use can be configured in the terminal by higher layer signaling. In other words, only the PRACH-like channel can be utilized or both channels can be utilized.

<Beam failure detection RS  >

If the system performs single / multiple BPL transmissions for control channels (not multiple BPLs), an SS block and / or CSI-RS may be used to detect the failure of a particular BPL. In particular, in order to detect the failure of a specific BPL, the UE measures the DMRS, the QCL SS block and / or the CSI-RS of the PDCCH transmitted to a specific BPL. SINR-like metric or L1-RSRP can be used as the measurement metric. That is, if the SINR-like metric or L1-RSRP for a specific BPL among the BPLs monitored by the UE drops below a certain threshold, it can be defined that a failure has occurred for the BPL. It is possible to specify whether the terminal detects beam failure based on any RS among the SS block or the CSI-RS or the SS block + CSI-RS, or it may be configured as a base station through higher layer signaling. The base station configuration may be one of the three methods described above, or one of several methods (eg, SS block or CSI-RS).

In particular, if the BS configures the beam failure detection RS, the threshold for beam failure detection may vary. For example, if the L1-RSRP of the monitoring BPL is less than the Ta, and if the beam failure of the specific monitoring BPL based on the SS block is detected, the L1-RSRP of the monitoring BPL is detected as Tb Can be detected. Also, when considering both SS block and CSI-RS, beam failure of a specific monitoring BPL can be detected when L1-RSRP becomes smaller than Tc. At this time, the values of Ta, Tb, and Tc may be specified in the standard or may be configured by the base station through higher layer signaling.

<New candidate beam identification RS  >

If the system performs single / multiple BPL transmissions for the control channel (not multiple BPLs), an SS block and / or CSI-RS may be used to select an alternate BPL for the particular failure-causing BPL (s) . Failure occurrence New candidate beam identification for finding the alternate BPL of the BPL (s) RS may be specified in the standard or may be configured in the base station. The terminal can select the alternate BPL of the failed BPL (s) through the L1-RSRP measurement of the new candidate beam identification RS. New candidate beam identification Whether to use SS block as RS or CSI-RS or both SS block and CSI-RS may be specified in the standard or higher layer signaling May be configured at the base station. The base station configuration may be one of the three methods described above, or one of several methods (eg, SS block or CSI-RS).

In particular, if the base station is configured to use both RSs, the BS may indicate which of the two RSs to assign priority to search for. For example, if a base station assigns a priority to CSI-RS, the terminal can perform a SS block review after considering CSI-RS for new beam identification.

Depending on which RS is used for new beam identification, the threshold for new beam identification can vary. For example, when performing new beam identification based on the SS block, a new candidate beam can be selected if L1-RSRP of a specific BPL is greater than Ta. If new beam identification is performed based on CSI-RS, If L1-RSRP is greater than Tb, it can be selected as a new candidate beam. In case of performing new beam identification using both SS block and CSI-RS, (For example, Tc when the SS block criterion and Td when the CSI-RS criterion is used) may be used. That is, if a new beam is searched for preferentially in the CSI-RS configured in the UE, a new candidate beam is selected if the L1-RSRP of the specific BPL is larger than Tc. However, if the CSI- SS block. In this case, if L1-RSRP of a specific BPL is larger than Td, it is selected as a new candidate beam. The values of Ta, Tb, Tc, and Td may be specified in the standard or may be configured by the base station through higher layer signaling.

<Beam failure detection RS  And new candidate beam identification RS Cycle>

If the system performs single / multiple BPL transmissions for the control channel (not multiple BPL transmissions), the SS block, CSI-RS, or SS block with beam failure detection RS and / or new candidate beam identification RS, And CSI-RS may be used. When SS block and CSI-RS are utilized for beam failure detection and / or new candidate beam identification, each period can be configured from the base station to higher layer signaling. For example, if an SS block is used for new candidate beam identification, the base station may configure the period of the SS block for new candidate beam identification to be 20 ms. This configuration value can also be interpreted as the period of the SS block for beam management. In another embodiment, when the SS block is utilized for beam failure detection and new candidate beam identification, the SS block periods for the two applications may be set to one configuration (common cycle) or to a different value. In another embodiment, when the CSI-RS is utilized for beam failure detection and new candidate beam identification purposes, the CSI-RS periods for the two applications may be configured as one (common period) or as a separate value.

In another embodiment, the terminal may assume a SS block period as a specific value in beam failure detection and / or new candidate beam identification. For example, if the SS block is used for new candidate beam identification, the mobile station can automatically assume 20 ms cycles for SS block reception for new candidate beam identification.

<Beam failure RR triggering condition>

In a system where multiple BPLs are monitored, the condition for triggering the terminal to perform beam RR is possible if one of the following is true:

One) If there is a failure for all the multiple BPLs being monitored by the terminal and at least one or more new candidate beams are found

2) Failure of some BPL among multiple BPLs being monitored by the terminal occurs. One or more alternate beams need not be found. In particular, at this time, the monitoring BPL does not regard the beam as a "substitute beam" for the failure occurrence beam for the beam that has not occurred.

3) At least one or more than one replacement beam is found for the BPL. In particular, at this time, BPLs that have not experienced any failure among the monitoring BPLs are considered as "alternative beams" for the failed BPLs.

In particular, condition 2 and 3 are classified according to the meaning of the "alternative beam" defined in the standard, so that even if only a part of the entire monitoring BPL occurs, the terminal can report a failure of the BPL to the base station Condition.

Alternatively, the above-described beam RR triggering condition can be applied only when a specific channel is utilized. For example, if the beam failure RR is performed using the PRACH-like channel only if the condition 1) is satisfied, or if the condition 2) or the condition 3) is satisfied, the beam failure RR using the PUCCH is performed This is possible.

< PRACH -like recovery request resource association>

If the system performs single / multiple BPL transmissions for the control channel (not multi-BPL), the PRACH-like recovery request resource may be associated with the SS block or the CSI-RS. Alternatively, the PRACH-like recovery request resource may be associated with the SS block and the CSI-RS. The PRACH-like recovery request resource selected by the MS is at least associated with a transmission beam through which the BS transmits a response to the recovery request. That is, the BS selects a transmission beam to transmit a response through the resource information that the MS transmits a recovery request, and the MS receives a response with a reception beam corresponding to the transmission beam. Also, it may be that the UE transmits the preferred BPL information for replacing the failure BPL according to the PRACH-like recovery request resource in which the UE performs the recovery request.

< PRACH -like recovery request resource and new candidate beam information association>

When a single or multiple BPL transmission is performed for a control channel in the system (not limited to multiple BPLs), the resource (time / frequency / sequence) selected by the terminal at the RR is at least the transmission beam for the base station to perform a response to the RR It may be for designation. Alternatively, the resource selected at the time of RR by the UE may include transmission beam designation for the BS to perform a response to the RR, and preferred BPL information for the UE to replace the BPL with the failure.

An example of the overall beam recovery request procedure is shown in FIG. 11 when the terminal is in mode 1 and two control channel transmission BPLs are being monitored for robust beam management.

As described above, there is shown a BPL setup process for performing multiple BPL monitoring after the initial connection of the UE. Based on the concurrent beam reception number information transmitted by the mobile station, the base station transmits robust beam management mode and measurement metric through UE-specific RRC signaling. In addition, the base station can inform the terminal about how many BPLs to monitor for robust beam management mode. According to this value, the UE can know how many preferred BPL information should be reported. In Mode 1, the base station can also inform the terminal of the monitoring method. For example, when you want to monitor two BPLs, you can tell them how often to change the two BPLs. For example, if BPL A and BPL B are used alternately over 8 slots and 2 slots, respectively, the DCI that confirms multiple BPLs is referred to as the slot to which the BPL A and BPL B are transmitted. DL and UL transmissions can be made and then DL and UL transmissions can be made to B BPL for the second slot. After UE-specific RRC signaling, the base station can activate reporting on the CSI-RS and the corresponding CSI-RS through the DCI so that the terminal can select a preferred multiple BPL. In this case, the beam used to transmit the DCI may be a base station transmission beam corresponding to the preferred BPL reported by the UE in the initial connection process, or a base station transmission beam transmitted through the RACH resource selection in the initial access process. When the activated CSI-RS is transmitted from the base station, the terminal selects and reports a preferred BPL based on the measurement performed through the corresponding CSI-RS. The base station then sends the ID (or CSI-RS port number) and the sequence information of the monitoring beams determined based on the terminal reporting to the DCI. In this case, the beam used to transmit the DCI may be a base station transmission beam corresponding to the preferred BPL reported by the UE in the initial connection process, or a base station transmission beam transmitted through the RACH resource selection in the initial access process. Based on this point, monitoring for the dominant BPL begins.

In the period in which monitoring is continued in 1 ^st BPL if other monitoring was determined the beam failure for BPL (s) if the base station through the DCI triggering a quality report for monitoring BPL, the MS through the UCI or MAC-CE monitoring BPL A quality report can be performed on the &lt; / RTI &gt; When periodic beam management RS is transmitted, the terminal can feed back a preferred BPL, which can replace the position of the observed BPL with beam failure. However, if the periodic beam management RS is not transmitted or the beam management RS is unsuitable for selecting a fine beam, then the base station will drop the DCI through the first BPL, and then transmit the CSI-RS and corresponding reporting You can do the activation. Through the CSI-RS reception, the UE reports new BPL information to fill the failure beam. If a new order financing is required between the current BPL and the newly reported BPL under the base station judgment, the DCI can notify the order in the order. When the next 2 ^nd BPL monitoring starts, the second BPL of the updated BPL list starts monitoring at 2 ^nd BPL monitoring.

If the first BPL is detected while monitoring the BPL other than the BPL with the first priority or while the first BPL is connected and if the base station triggers the quality report with the DCI transmitted by the second BPL , The UE can transmit a quality report for the BPL being monitored through UCI or MAC-CE. When periodic beam management RS is transmitted, the terminal can feed back a preferred BPL, which can replace the position of the observed BPL with beam failure. However, if the periodic beam management RS is not transmitted or the beam management RS is inadequate to select the fine beam, then the base station will drop the DCI through the second BPL and select the new BPL based on the CSI-RS and corresponding reporting You can do the activation. If the UE notifies the failure of the first BPL through the UCI, the BS changes the currently connected BPL to the first BPL. It is possible to begin monitoring again assuming that the second BPL is the first BPL based on the point at which it confirms that the second BPL has been changed to the first BPL through DCI. Alternatively, it is also possible to look at the second BPL for the first BPL monitoring period based on the time at which the second BPL monitoring starts. Through the CSI-RS reception, the UE reports new BPL information to fill the failure beam. If a new order financing is required between the current BPL and the newly reported BPL under the base station judgment, the DCI can notify the order in the order. When the next 2nd BPL monitoring starts, the second BPL of the updated BPL list starts monitoring at the 2nd BPL monitoring time.

According to another embodiment of the present invention, when a UE detects a failure of a BPL connected to a current BS, an opportunity to use a beam recover request resource during a monitoring period of a BPL connected to the current BS is found beam recovery request resource is defined), failure of the corresponding BPL may be reported through the RR resource. A new BPL may then be reported to fill the failed BPL, and the base station may confirm the updated BPL list information with RRC, MAC-CE or DCI to the terminal.

1m / 1o / 1o / 1p / 1q / 1r / 1s when the UE is performing mode 1 and when two control channel transmission BPLs are being monitored for robust beam management. Respectively. In order to transmit failure BPL information of the terminal and to monitor the BPL (s) of the base station in the order of 1m / 1n / 1o / 1p / 1q / 1r / 1s, And information about the ID reestablished for the BPLs.

<Multi BPL monitoring  Multiplexing between base stations and terminals for performance monitoring BPL set up  >

FIG. 1M shows a process of setting up multiple BPL monitoring between base stations and terminals to perform multi-BPL monitoring after initial connection of a UE. Based on the concurrent beam reception number information transmitted by the mobile station, the base station transmits robust beam management mode and measurement metric through UE-specific RRC signaling. In addition, the base station can inform the terminal about how many BPLs to monitor for robust beam management mode. According to this value, the UE can know how many preferred BPL information should be reported. In Mode 1, the base station can also inform the terminal of the monitoring method. For example, when you want to monitor two BPLs, you can tell them how often to change the two BPLs. For example, if BPL A and BPL B are used alternately over 8 slots and 2 slots, respectively, the DCI that confirms multiple BPLs is referred to as the slot to which the BPL A and BPL B are transmitted. DL and UL transmissions can be made and then DL and UL transmissions can be made to B BPL for the second slot. After UE-specific RRC signaling, the base station can activate reporting on the CSI-RS and the corresponding CSI-RS via DCI or MAC-CE so that the terminal can select a preferred multiple BPL. At this time, the beam used to transmit DCI or MAC-CE may be a base station transmission beam corresponding to a preferred BPL reported by the UE in the initial connection process, or may be a base station transmission It may be a beam. When the activated CSI-RS is transmitted from the base station, the terminal selects and reports a preferred BPL based on the measurement performed through the corresponding CSI-RS. Then, the base station sends the ID (or CSI-RS port number) and the order information of the monitoring beams determined based on the terminal reporting to DCI or MAC-CE. At this time, the beam used to transmit DCI or MAC-CE may be a base station transmission beam corresponding to a preferred BPL reported by the UE in the initial connection process, or may be a base station transmission It may be a beam. Based on this point, monitoring for the dominant BPL begins.

<Base Station BPL  quality reporting request beam failure recovery>

FIG. 1n illustrates a case where two BPLs are monitored, a SS block (i.e., composite beam) is used for new beam identification, and a B BPL is monitored during A BPL monitoring. Show the RR process. A If the BS triggers quality reporting through the BPL on one of the RRC / DCI / MAC-CE terminals, the terminal shall include RSRP information for the A / B BPL (which includes failure information for BPL) ) And the preferred composite beam, or using the identifiable ID for the A / B BPL to convey information about the ID of the BPL, the RSRP of the BPL, and the preferred composite beam. The information about the preferred composite beam means that the selected beam ID or port ID based on the SS block can refer to the resource ID. The reason is that the terminal transmits a new fine BPL for updating the BPL (BPL) (That is, to refinement the beam selected on the basis of the SS block). It is also possible to transmit a plurality of preferred composite beam information from the terminal to the base station. In this case, it is necessary to review the alternative beam for the B BPL where the failure occurs and to find out whether there is a better BPL for the A BPL.

The base station activates and transmits the CSI-RS with one of the RRC / DCI / MAC-CE based on the information about the composite beam (s) transmitted by the UE. The UE transmits UCI / Alternate BPL information for changing failure BPL (B BPL) can be delivered via one of the MAC-CEs. Alternative BPL information for changing failure BPL (B BPL) and BPL information for updating A BPL may also be included. At this time, the alternative BPL for B BPL may be A BPL. Upon receiving this information, the base station can rearrange the monitoring order of the A BPL and the reporting BPL transmitted from the terminal through one of the RRC / DCI / MAC-CE. Alternatively, the UE may inform the UE of alternative BPL information for changing failure BPL (B BPL) and A BPL through one of RRC / UCI / MAC-CE. In other words, A / B BPL to C / D BPL at this time. And can inform the UE of the monitoring sequence of the C / D BPL through one of RRC / DCI / MAC-CE. At this time, the monitoring period of C / D can basically be kept the same as the monitoring period of A / B. Alternatively, if necessary, the base station can change the monitoring period of the monitoring BPLs to the terminal through one of RRC / DCI / MAC-CE.

According to another embodiment, when the CSI-RS is used instead of the SS block for the new beam identification, the terminal generates CSI-RS based on the SS block instead of the beam / port / resource ID selected in the quality reporting of the monitoring BPLs Or a beam / port / resource ID to replace the selected B or A / B. In this case, after receiving the BPL information reported to the UE, the BS can perform an alternative BPL confirmation and order reordering for B or A / B BPL through one of RRC / MAC-CE / DCI.

According to another embodiment, when an SS block is used for new beam identification, the terminal replaces B or A / B selected based on the SS block in quality reporting for monitoring BPLs, as in the embodiment described in 1m. A / B BPL through one of RRC / MAC-CE / DCI without performing fine beam association process through CSI-RS transmission. BPL confirmation and reordering can be performed. After this recovery procedure, the base station can further refine the updated monitoring BPLs if necessary.

< PRACH -like channel ( PRACH -like RR region for beam failure recovery>

FIG. 10 shows a first embodiment of a PRACH-like RR region utilization RR process for B BPL during A BPL monitoring when two BPLs are monitored and a PRACH-like channel is associated with SS blocks. The UE transmits the RR message in the PRACH-like RR region. Subsequently, one of the A / B BPLs through the UCI / MAC-CE can transmit the alternative BPL information with information on which BPL is the failure BPL. Or if both A / B BPL failures can be reported for alternative BPLs for both BPLs. The alternative BPL information may include a resource / beam / port ID associated with the CSI-RS transmitted by the base station after the terminal recovery request. After the terminal recovery request, the CSI-RS transmitted by the base station may be associated with the recovery request selection resource of the terminal. For example, when the UE performs the RR through the PRACH-like RR resource associated with the SS block # 1, the BS may drop a fine beam toward the SS block # 1 beam direction. However, it is not limited to the standard as a base station implementation. The base station can then transmit the beam (or BPL) ID and monitoring sequence information to the alternate BPL (s) via one of the RRC / DCI / MAC-CE.

According to another embodiment, if the PRACH-like channel is associated with the SS block and the CSI-RS, the terminal is associated with the CSI-RS to perform the recovery request in the PRACH-like resource associated with the SS block The CSI-RS transmission for refinement can be determined depending on whether or not the recovery request is performed in the PRACH-like resource. For example, if a terminal performs a recovery request in a PRACH-like resource associated with an SS block, the BS may activate the CSI-RS to find a fine beam to replace the BPL of the failure.

FIG. 1P shows a second embodiment of the RR process using the RR region for the B BPL during the monitoring of the A BPL when the two BPLs are monitored and the PRACH-like channel is associated with the SS block. When transmitting the RR in the PRACH-like RR region, the UE transmits information on whether the BPL of the failure is A or B when the RR is transmitted. It can be divided into resources (frequency / time / sequence, etc.). Alternatively, the UE may transmit a situation in which all of the A / B BPLs have failed in transmitting the RR message. In this embodiment, the UE may then report information on the BPL (s) to replace the failed BPL (s) via the UCI / MAC-CE, and the base station may transmit one of the RRC / DCI / MAC- (Or BPL) ID and monitoring sequence information for the alternate BPL (s).

According to another embodiment, even when a PRACH-like channel is associated with an SS block and a CSI-RS, information on whether a failure occurrence beam is A or B can be transmitted through a recovery request. It can be divided into resources (frequency / time / sequence, etc.). Alternatively, the UE may transmit a situation in which all of the A / B BPLs have failed in transmitting the RR message. If the alternative beam for the failure occurrence beam is a beam associated with the SS block (i.e., the failure situation of a particular BPL is associated with the SS block), then the resource transmitting the RR may represent the alternate beam information for the failed BPL. The BS can activate the CSI-RS and perform the refinement of the corresponding BPL together.

<Beam failure recovery when performing terminal-specific RR>

A base station-terminal operation embodiment is shown in FIG. 1Q when the terminal performs a dedicated RR. In particular, Figure 1q shows the case of performing an RR for B BPL during A BPL connection. As shown in FIG. 1Q, the UE can perform the RR for the failed BPL in the UL resource allocated through the grant after the SR request through the periodic PUCCH. Alternatively, the terminal may send an RR request message (including a failure BPL and alternative BPL information) directly on the PUCCH.

<New beam identification RS Beam failure recovery according to>

When the SS block and the CSI-RS are used for the new beam identification RS, when the terminal reports the alternative BPL information for the failure BPL to the base station, the corresponding information shall include the following information:

One) Failure The alternative BPL for BPL is related to CSI-RS or SS block

2) 1), determine what resource / beam / port ID the alternate BPL for the Failure BPL is based on

For example, if a terminal finds an alternate BPL for a failure BPL on a CSI-RS that has already been configured from a base station, the terminal may determine that the beam found by the terminal is a BPL found based on the CSI- -RS resource / beam / port ID information.

<Beam failure recovery request triggering condition according to beam failure recovery>

If a beam failure RR triggering condition is defined in the condition 3 of the above-mentioned Beam failure RR triggering condition, failure occurs when one or more BPLs of the BPLs monitored by the terminal are failed. Replacement of BPL information and each failure occurrence BPL BPL information to be sent. Replacement BPL for each BPL may be the same as BPL for which no failure has occurred in the current monitoring BPLs. Alternative BPL information for each failed BPL is

One) It can be a resource / beam / port ID based on CSI-RS or SS block configured in the terminal

2) The resource / beam / port ID based on the CSI-RS or SS block configured on the terminal or the ID of the BPL in which no failure occurred among the monitoring BPLs (for example, the A / B BPL was monitored before the terminal performed RR, It is possible to refer to the ID at this time when the ID is assigned to the BPL of A and the B of BPL.

In the case of a system applying 2), the alternative BPL information for each failed BPL should include two pieces of information: a CSI-RS or SS block-based ID identification or a monitoring BPL ID. How many of the distinguished IDs.

If the beam failure RR triggering condition is defined in the condition 2 of the above-described beam failure RR triggering condition, the UE shall notify the base station of the alternative BPL information for the failed BPL or notify that there is no alternative BPL for the generated BPL. . FIG. 1 r shows an embodiment in which when the UE performs mode 1, beam failure RR triggering condition 2 is applied to the system, and performs RR using PRACH-like RR region for A / B BPL during A BPL connection . The BPL is informed to the base station that there is no alternative beam for the BPL in which the failure occurs for the specific BPL, and the base station notifies the BPL that the failure occurs in one of RRC / MAC-CE / DCI. Information may be used to instruct the terminal to select and replace one of the monitoring BPLs prior to performing the recovery request.

Alternatively, in the above embodiment, if the system defines a beam failure RR triggering condition in the condition 2 of the beam failure RR triggering condition and only two BPLs are monitored, if the terminal notifies the base station that there is no alternative beam for the BPL in which the failure occurs Automatic Failure Occurrence BPL-to-BPL can be connected to a BPL in which failure has not occurred in a period in which a base station-terminal is connected.

The above operation is applicable even when the PRACH-like RR resource is not utilized.

In the above embodiments, the overall beam recovery procedure is performed by the BPL corresponding to the PRACH-like RR resource in which the UE transmits the recovery request. However, if the BPL information is transmitted directly to the PRACH-like RR resource, The DL / UL between the BS and the BS can be performed from the BS response to the RR to the BPL without the failure (FIG. 1 S).

<DL / UL beam designation>

In case of monitoring multiple BPL, if the base station sends DCI to the DL transmission beam corresponding to a specific BPL among the BPLs included in the multiple BPL, the terminal transmits UCI and UL (corresponding to the same BPL) UL transmission beam corresponding thereto You have to send the data. Alternatively, if the base station sends a DCI to a DL transmit beam corresponding to a particular BPL, it instructs the DCI to send the UCI and UL data to the UL transmit beam (corresponding to another BPL that is being monitored) It is possible. Here, the UL transmission beam corresponding to the beam transmitting the DCI does not necessarily have to be in the same direction / width as the reception beam used by the UE to receive the corresponding DCI, and also includes UL transmission for transmitting UCI and UL data The beams may be the same or different.

Or for a DCI transmitted on a particular DL beam, the terminal may not necessarily need to send UCI and UL data to the corresponding UL transmit beam. For example, when performing HARQ bundling for DL data scheduled from a DCI of a plurality of monitoring BPLs, it is possible to perform UL through a BPL connected at a time of collective HARQ transmission for DCIs transmitted in different DL BPLs.

Or, the system may perform HARQ bundling only on the DL data scheduled from the DCI transmitted in the same BPL.

Alternatively, in a multi-BPL monitoring situation, the system may not execute commands that require batch processing for multiple DCIs.

The BS can set the one CORSET allocated to the UE to have the QCL relationship with N CSI-RS resources. Alternatively, the base station may allocate N CSIs with one CSI-RS resource and QCL to the UE.

The UE finds an optimal reception beam for each of the N CSI-RS resources to form a BPL, measures the RSRP value of the CSI-RS resource based on the BPL formed for each CSI-RS resource, . The RSRP value may be replaced with an SINR value or an RSRQ value.

The recovery request signal can be generated as a combination of two resources. The first resource constituting the recovery request signal may include information indicating which of the N CSI-RS resources the UE has detected the beam failure through the measurement of the CSI-RS resource. The second resource constituting the recovery request signal may include information indicating the resource index of the SS-block or the resource index of the CSI-RS in which the UE has identified the new candidate beam.

Hereinafter, to explain the embodiment, it is assumed that N = 2, and the N CSI-RS resources are defined as "A" and "B", respectively.

The first resource may indicate whether beam failure has been detected at "A", whether beam failure has been detected at "B", or whether beam failure has been detected at both "A" and "B". For example, the base station can allocate three different sequences S1, S2, and S3 to the terminal for the first resource. If the terminal detects beam failure only for "A", the terminal can use the first sequence S1 when transmitting the recovery request signal. If the terminal detects beam failure only for "B", the terminal can use the second sequence S2 when transmitting the recovery request signal. If all terminals detect beam failure for "A" and "B", the terminal can use the third sequence S3 when transmitting the recovery request signal.

When the number of SS-block indexes that can be used for new beam identification is defined as T (for example, T = 64), the second resource may be composed of T + 1, The resources of X0, X1, ... , XT can be defined. If there is no new candidate beam newly identified by the UE, the UE can transmit the recovery request by selecting the resource X0. If the terminal identifies a new candidate beam through measurement of SS-block corresponding to the SS-block index t, the terminal can transmit a recovery request using resource Xt. The second resource can be defined as T + 1 through the division of time / frequency resources.

When the S1 sequence corresponding to the beam failure of the "A " resource is used for the recovery request transmission and the time / frequency resource position corresponding to X0 is used in the above embodiment, the terminal determines that the response of the base station for the recovery request is & Can be assumed to be transmitted with a CORSET that is QCLed to a resource. After a predetermined time from when the UE transmits the recovery request, the UE can monitor the CORSET to receive the response. The UE can obtain information on whether the setting for the CORSET that has been QCLed for the "A " resource has been changed to the QCL for the" B " resource through the reception of the response.

When the S1 sequence corresponding to the beam failure of the "B" resource is used for the recovery request transmission and the time / frequency resource position corresponding to X0 is used in the above embodiment, the terminal determines that the response of the base station for the recovery request is & "It can be assumed that the resource is sent to COREST which is QCL. After a predetermined time from when the UE transmits the recovery request, the UE can monitor the CORSET to receive the response. The UE can obtain information on whether the setting for the CORSET that has been QCLed for the "B " resource has been changed to the QCL for the" A " resource through the reception of the response.

In the above embodiment, when the S3 sequence corresponding to the beam failure of both the "A" and the "B" resources is used for the recovery request transmission and the time / frequency resource location corresponding to Xt is used, Can be assumed to be sent to COREST, which is QCLed at the SS-block index t. After a predetermined time from when the UE transmits the recovery request, the UE can monitor the CORSET to receive the response. The UE can obtain information on whether the settings for the CORSET that have been QCLed for the "A" resource and the "B" resource have been changed to the QCL for the SS-block index t through the reception of the response.

In the above embodiment, when the S1 sequence corresponding to the beam failure of the "A " resource is used for the recovery request transmission and the time / frequency resource location corresponding to Xt is used, it can be assumed that it is transmitted to COREST which is QCL at block index t. After a predetermined time from when the UE transmits the recovery request, the UE can monitor the CORSET to receive the response. Upon receiving the response, the UE obtains information on whether the setting for the CORSET that was QCLed for the "A" resource has been changed to the QCL for the SS-block index t or to the QCL for the "B" resource .

In the above embodiment, when the S2 sequence corresponding to the beam failure of the "B" resource is used for the transmission of the recovery request and the time / frequency resource location corresponding to Xt is used, it can be assumed that it is transmitted to COREST which is QCL at block index t. After a predetermined time from when the UE transmits the recovery request, the UE can monitor the CORSET to receive the response. Upon receiving the response, the UE obtains information on whether the setting for the CORSET that has been QCLed for the resource "B" has been changed to the QCL for the SS-block index t or to the QCL for the "A" resource .

2 is a diagram illustrating a configuration of a base station according to the present invention.

The base station according to an embodiment of the present invention includes a processing unit 210, a receiving unit 220, and a transmitting unit 230. The receiving unit 220 and the transmitting unit 230 are functionally connected to the processing unit 210 to enable communication with other entities such as a terminal. The processing unit 210 is configured to perform operations of the base station among the above-described methods.

3 is a diagram illustrating a configuration of a terminal according to the present invention.

A terminal according to an embodiment of the present invention includes a processing unit 310, a receiving unit 320, and a transmitting unit 330. The receiving unit 320 and the transmitting unit 330 are functionally connected to the processing unit 210 to enable communication with other entities such as a base station. The processing unit 210 is configured to perform operations of the terminal among the above-described methods.

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

Claims (1)

A method for processing a control signal in a wireless communication system,
Receiving a first control signal transmitted from a base station;
Processing the received first control signal; And
And transmitting the second control signal generated based on the process to the base station.

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