KR102434018B1 - Ssb to rach resource associations and related rach configuration contents in a multi-beam system - Google Patents

Abstract

The present invention may provide a method for a terminal to perform a random access procedure in a wireless communication system. In this case, the method for the UE to perform the random access procedure may include receiving RACH configuration information from the base station and transmitting a first message to the base station based on the received RACH configuration information. In this case, each of the plurality of synchronization signal blocks may correspond to a plurality of preambles, and the first message may be transmitted through a plurality of RACH resources in the time domain.

Description

SSB and RACH resource association in multi-beam system and RACH configuration contents

The present invention relates to a method of configuring a RACH (Random Access Channel) resource for transmitting message 1 (Msg. 1) during a random access (RA) procedure in a multi-beam system.

In addition, the present invention relates to a method of associating a plurality of synchronization signal blocks (Synchronization Signal Block, SSB) with an RACH resource in consideration of the “Sub-6GHz” and “above-6GHz” carrier frequency cases.

Hereinafter, the present invention will be described based on the 3GPP NR system for convenience of description, but the present invention is not limited to the above-described embodiment.

Recently, discussions are underway for 5G (5G) communication through a program called "IMT for 2020 and beyond". At this time, the 3GPP (3rd Generation Partnership Project) NR (New Radio) system considers various scenarios, service requirements, potential system compatibility, etc., and supports various numerology for time-frequency resource unit standards. direction is being discussed.

At this time, as an example, a resource setting method in consideration of the random access message 1 based on the 5G requirement is being discussed.

An object of the present invention is to provide a method for RACH configuration and SSB and PRACH resource association in a multi-beam system.

An object of the present invention is to provide a method for solving the problem of overlapping of a transmit beam (Tx beam) and a receive beam (Rx beam) by beam mismatch (no perfect beam correspondence) in a base station.

An object of the present invention is to provide flexibility to a base station for receiving beam switching.

An object of the present invention is that the same mapping is used for the independence of the base station receive beam.

An object of the present invention is to provide Remaining Minimum System Information (RMSI) for RACH configuration.

An object of the present invention is to provide a method for reducing signaling overhead.

An object of the present invention is to provide a method for reducing delay occurring based on a degree-of-freedom in a frequency domain.

An object of the present invention is to provide a method for not dividing a sequence into groups for different SSBs.

An object of the present invention is to provide diversity in the frequency domain of a preamble when the number of transmit beams is smaller than the number of receive beams as “above 6 GHz” and is located at a boundary.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. will be able

According to an embodiment of the present invention, it is possible to provide a method for a terminal to perform a random access procedure in a wireless communication system. In this case, the method for the UE to perform the random access procedure may include receiving RACH configuration information from the base station and transmitting a first message to the base station based on the received RACH configuration information. In this case, each of the plurality of synchronization signal blocks may correspond to a plurality of preambles, and the first message may be transmitted through a plurality of RACH resources in the time domain.

In addition, according to an embodiment of the present invention, it is possible to provide a method for a base station to perform a random access procedure in a wireless communication system. At this time, the method for the base station to perform the random access procedure is a synchronization signal block (SSB) and RACH (Random Access Channel) resource correspondence in consideration of the information included in the RACH configuration (Configuration) information determining, It may include transmitting the RACH configuration information to the terminal, and receiving a first message from the terminal based on the RACH configuration information. In this case, each of the plurality of SSBs may correspond to a plurality of preambles, and the first message may be received through a plurality of RACH resources in the time domain.

In addition, according to an embodiment of the present invention, it is possible to provide a terminal that performs a random access procedure in a wireless communication system. In this case, the terminal may include a transmitter, a receiver, and a processor for controlling the transmitter and the receiver. In this case, the processor may receive random access channel (RACH) configuration information from the base station through the receiver, and transmit a first message to the base station based on the received RACH configuration information. In this case, each of a plurality of synchronization signal blocks (SSB) may correspond to a plurality of preambles, and the first message may be transmitted through a plurality of RACH resources in the time domain.

In addition, according to an embodiment of the present invention, it is possible to provide a base station for performing a random access procedure in a wireless communication system. In this case, the base station may include a transmitter, a receiver, and a processor for controlling the transmitter and the receiver. At this time, the processor determines the information included in the RACH configuration information in consideration of the synchronization signal block (SSB) and the RACH (Random Access Channel) resource correspondence, and transmits the RACH configuration information to the terminal through the transmitter. and may receive the first message based on the RACH configuration information received from the terminal through the receiver. In this case, each of the plurality of SSBs may correspond to a plurality of preambles, and the first message may be received through a plurality of RACH resources in the time domain.

In addition, according to an embodiment of the present invention, a plurality of preambles corresponding to the plurality of SSBs are all the same preamble, and each of the plurality of SSBs may be distinguished based on the respective positions of the plurality of RACH resources.

In addition, according to an embodiment of the present invention, when the number of Tx beams and the number of Rx beams of the base station are the same, the first message corresponding to one SSB is transmitted from two consecutive RACH resources. can be transmitted.

In addition, according to an embodiment of the present invention, when the number of Tx beams of the base station is greater than the number of Rx beams, the first message of the SSB corresponding to the boundary transmission beam is two consecutive RACHs. The first message of the SSB transmitted in the resource and corresponding to the non-boundary transmission beam may be transmitted in one RACH resource.

In addition, according to an embodiment of the present invention, when the number of Tx beams of the base station is smaller than the number of Rx beams, the beam sweeping timing of the boundary reception beam and the non-boundary reception beam sweeping timing are different. can be set.

Also, according to an embodiment of the present invention, each of the plurality of SSBs may correspond to a different preamble, and each of the plurality of SSBs may be distinguished based on the preambles.

At this time, according to an embodiment of the present invention, when the number of Tx beams and the number of Rx beams of the base station are the same, a first message including a plurality of preambles corresponding to each of the plurality of SSBs is It may be transmitted in one RACH resource.

In addition, according to an embodiment of the present invention, when the number of Tx beams of the base station is greater than the number of Rx beams, a first message including a plurality of preambles corresponding to each of the plurality of SSBs is Transmitted in one RACH resource, the first message of the SSB corresponding to the boundary transmission beam is transmitted in two consecutive RACH resources, and the first message of the SSB corresponding to the non-boundary transmission beam is transmitted in one RACH resource can be

In addition, according to an embodiment of the present invention, when the number of Tx beams of the base station is smaller than the number of Rx beams, the first message corresponding to the SSB monitored by the boundary reception beam is continuous It can be transmitted on two RACH resources.

Also, according to an embodiment of the present invention, the random access procedure may be applied at less than 6 GHz.

According to the present disclosure, it is possible to provide a method for RACH configuration and SSB and PRACH resource association in a multi-beam system.

According to the present disclosure, it is possible to provide a method for solving the problem of overlapping of a transmit beam (Tx beam) and a receive beam (Rx beam) by beam mismatch (no perfect beam correspondence) in a base station.

According to the present disclosure, it is possible to provide flexibility to the base station for receiving beam switching.

According to the present disclosure, the same mapping may be used for the independence of the base station receive beam.

According to the present disclosure, Remaining Minimum System Information (RMSI) for RACH configuration may be provided.

According to the present disclosure, it is possible to provide a method for reducing signaling overhead.

According to the present disclosure, it is possible to provide a method of reducing a delay occurring based on a degree-of-freedom in a frequency domain.

According to the present disclosure, it is possible to provide a method of not dividing a sequence into groups for different SSBs.

According to the present disclosure, diversity in the frequency domain of the preamble can be provided when the number of transmit beams is smaller than the number of receive beams as “above 6 GHz” and is located at the boundary.

Effects obtainable in the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the art to which the present disclosure belongs from the description below. will be.

1 is a diagram illustrating a communication system.
2 is a view showing a frame structure.
3 is a diagram illustrating a multi-beam structure.
4 is a diagram illustrating a structure of an SSB burst set.
5 is a diagram illustrating a case where the number of transmission beams and the number of reception beams are the same.
6 is a diagram illustrating a case in which the number of transmit beams is greater than the number of receive beams.
7 is a diagram illustrating a case where the number of transmit beams is smaller than the number of receive beams.
8 is a diagram illustrating RACH resource mapping when the number of transmit beams and the number of receive beams are the same.
9 is a diagram illustrating RACH resource mapping when the number of transmit beams and the number of receive beams are the same.
10 is a diagram illustrating RACH resource mapping when the number of transmit beams and the number of receive beams are the same.
11 is a diagram illustrating RACH resource mapping when the number of transmit beams is greater than the number of receive beams.
12 is a diagram illustrating RACH resource mapping when the number of transmit beams is greater than the number of receive beams.
13 is a diagram illustrating RACH resource mapping when the number of transmit beams is greater than the number of receive beams.
14 is a diagram illustrating RACH resource mapping when the number of transmit beams is smaller than the number of receive beams.
15 is a diagram illustrating RACH resource mapping when the number of transmit beams is smaller than the number of receive beams.
16 is a diagram illustrating RACH resource mapping when the number of transmit beams is greater than the number of receive beams.
17 is a diagram illustrating RACH resource mapping when the number of transmit beams is greater than the number of receive beams.
18 is a diagram illustrating RACH resource mapping when the number of transmit beams is greater than the number of receive beams.
19 is a diagram illustrating RACH resource mapping when the number of transmit beams and the number of receive beams are the same.
20 is a diagram illustrating RACH resource mapping when the number of transmit beams is smaller than the number of receive beams.
21 is a diagram illustrating RACH resource mapping when the number of transmit beams is smaller than the number of receive beams.
22 is a flowchart illustrating a method of performing a random access procedure.
23 is a view showing an apparatus of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description and the accompanying drawings, substantially the same components are denoted by the same reference numerals, so that redundant descriptions will be omitted. In addition, in the description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted.

In describing an embodiment of the present invention, if it is determined that a detailed description of a well-known configuration or function may obscure the gist of the present invention, a detailed description thereof will be omitted. And, in the drawings, parts not related to the description of the present invention are omitted, and similar reference numerals are attached to similar parts.

In the present invention, when it is said that a certain element is "connected", "coupled" or "connected" with another element, it is not only a direct connection relationship, but also an indirect connection relationship in which another element exists in the middle. may also include. In addition, when it is said that a component "includes" or "has" another component, it means that another component may be further included without excluding other components unless otherwise stated. .

In the present invention, terms such as first, second, etc. are used only for the purpose of distinguishing one component from other components, and unless otherwise specified, the order or importance of the components is not limited. Therefore, within the scope of the present invention, a first component in one embodiment may be referred to as a second component in another embodiment, and similarly, a second component in one embodiment is referred to as a first component in another embodiment. may also be called

In the present invention, the components that are distinguished from each other are for clearly explaining each characteristic, and do not necessarily mean that the components are separated. That is, a plurality of components may be integrated to form one hardware or software unit, or one component may be distributed to form a plurality of hardware or software units. Accordingly, even if not specifically mentioned, such integrated or dispersed embodiments are also included in the scope of the present invention.

In the present invention, components described in various embodiments do not necessarily mean essential components, and some may be optional components. Accordingly, an embodiment composed of a subset of components described in one embodiment is also included in the scope of the present invention. In addition, embodiments including other components in addition to the components described in various embodiments are also included in the scope of the present invention.

1 is a diagram illustrating a communication system.

The communication system 100 includes a plurality of communication nodes 110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130- 5, 130-6). Here, the communication system may be referred to as a “communication network”. Each of the plurality of communication nodes may support at least one communication protocol. As an example, each of the plurality of communication nodes is a CDMA (code division multiple access)-based communication protocol, a wideband CDMA (WCDMA)-based communication protocol, a time division multiple access (TDMA)-based communication protocol, and a frequency division multiple access (FDMA)-based communication protocol. ) based communication protocol, OFDM (orthogonal frequency division multiplexing) based communication protocol, OFDMA (orthogonal frequency division multiple access) based communication protocol, SC (single carrier)-FDMA based communication protocol, NOMA (non-orthogonal multiple access) ) based communication protocol, SDMA (space division multiple access) based communication protocol, etc. may be supported. Each of the plurality of communication nodes may have the following structure, and is not limited to the above-described embodiment.

In addition, as an example, the following description will be made based on the data transmission/reception relationship between the base station and the mobile station. In this case, the base station may be a terminal node of a network that directly communicates with the mobile station. In addition, a specific operation described as being performed by the base station may be performed by an upper node of the base station in some cases. That is, various operations performed for communication with a mobile station in a network including a plurality of network nodes including a base station are referred to as base station operations.

In this case, the base station may be a Node B, an eNode B, a gNode B, or the like, and will be referred to as a base station below for convenience of description.

In addition, a 'mobile station (MS)' may be a user equipment (UE), a subscriber station (SS), a mobile terminal, or a station, and hereinafter, for convenience of description, it is referred to as a base station. .

Also, in the uplink, the mobile station becomes the transmitting end and the base station becomes the receiving end, and in the downlink, the mobile station becomes the receiving end and the base station becomes the transmitting end.

In addition, the description that the device communicates with the 'cell' may mean that the device transmits/receives a signal to and from the base station of the corresponding cell. That is, an actual target to which the device transmits and receives signals may be a specific base station, but for convenience of description, it may be described as transmitting/receiving a signal to and from a cell formed by the specific base station. Similarly, the description of 'macro cell' and/or 'small cell' may mean specific coverage, respectively, as well as 'macro base station supporting macro cell' and/or 'small cell supporting small cell' It may mean 'base station'.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802.xx system, 3GPP system, 3GPP LTE system, and 3GPP2 system. That is, obvious steps or parts not described in the embodiments of the present invention may be described with reference to the above documents.

In this case, referring to FIG. 1 , the communication system 100 includes a plurality of base stations 110-1, 110-2, 110-3, 120-1, 120-2, and a plurality of terminals (users). equipment) 130-1, 130-2, 130-3, 130-4, 130-5, 130-6. Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may form a macro cell. Each of the fourth base station 120-1 and the fifth base station 120-2 may form a small cell. The fourth base station 120-1, the third terminal 130-3, and the fourth terminal 130-4 may belong to the coverage of the first base station 110-1. The second terminal 130-2, the fourth terminal 130-4, and the fifth terminal 130-5 may belong to the coverage of the second base station 110-2. The fifth base station 120-2, the fourth terminal 130-4, the fifth terminal 130-5, and the sixth terminal 130-6 may belong within the coverage of the third base station 110-3. . The first terminal 130-1 may belong to the coverage of the fourth base station 120-1. The sixth terminal 130-6 may belong to the coverage of the fifth base station 120-2.

At this time, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 is a NodeB (NodeB), an advanced NodeB (evolved NodeB), a next-generation NodeB (gNodeB), BTS (base transceiver station), radio base station (radio base station), radio transceiver (radio transceiver), access point (access point), access node (node), road side unit (RSU), DU (digital unit) , a cloud digital unit (CDU), a radio remote head (RRH), a radio unit (RU), a transmission point (TP), a transmission and reception point (TRP), a relay node, and the like. Each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, 130-6 is a terminal, an access terminal, a mobile terminal, It may be referred to as a station, a subscriber station, a mobile station, a portable subscriber station, a node, a device, and the like.

A plurality of communication nodes (110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6) Each can support cellular communication (eg, long term evolution (LTE), LTE-A (advanced), 3GPP 5G New Radio (NR), etc. defined in 3rd generation partnership project (3GPP) standards). . Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may operate in different frequency bands or may operate in the same frequency band. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to each other through an ideal backhaul or a non-ideal backhaul, and the ideal backhaul Alternatively, information may be exchanged with each other through a non-ideal backhaul. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to a core network (not shown) through an ideal backhaul or a non-ideal backhaul. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 transmits a signal received from the core network to the corresponding terminals 130-1, 130-2, 130-3, 130 -4, 130-5, 130-6), and the signal received from the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) is transmitted to the core network can be sent to

Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may support OFDMA-based downlink transmission, and SC-FDMA-based uplink (uplink) transmission. ) can support transmission. In addition, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 transmits multiple input multiple output (MIMO) (eg, single user (SU)-MIMO, MU (multi user)-MIMO, massive MIMO, etc.), coordinated multipoint (CoMP) transmission, carrier aggregation transmission, transmission in an unlicensed band, device to device, D2D ) communication (or ProSe (proximity services), etc.), etc. Here, each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, 130-6 is a base station. (110-1, 110-2, 110-3, 120-1, 120-2) and corresponding operation, by the base station (110-1, 110-2, 110-3, 120-1, 120-2) Supported actions can be performed.

For example, the second base station 110-2 may transmit a signal to the fourth terminal 130-4 based on the SU-MIMO method, and the fourth terminal 130-4 may transmit a signal based on the SU-MIMO method. A signal may be received from the second base station 110 - 2 . Alternatively, the second base station 110-2 may transmit a signal to the fourth terminal 130-4 and the fifth terminal 130-5 based on the MU-MIMO scheme, and the fourth terminal 130-4. and each of the fifth terminals 130 - 5 may receive a signal from the second base station 110 - 2 by the MU-MIMO method. Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may transmit a signal to the fourth terminal 130-4 based on the CoMP method, and the fourth The terminal 130-4 may receive signals from the first base station 110-1, the second base station 110-2, and the third base station 110-3 by the CoMP method. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 includes the terminals 130-1, 130-2, 130-3, 130-4, 130-5, 130-6) and a signal may be transmitted/received based on the CA method. Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 coordinates D2D communication between the fourth terminal 130-4 and the fifth terminal 130-5. (coordination), each of the fourth terminal 130-4 and the fifth terminal 130-5 is D2D communication by the coordination of each of the second base station 110-2 and the third base station 110-3 can be performed.

Next, random access techniques in a wireless communication system will be described. Here, even when a method (eg, transmission or reception of a signal) performed in a first communication node among communication nodes is described, a second communication node corresponding thereto is a method corresponding to the method performed in the first communication node (eg, receiving or transmitting a signal).

That is, when the operation of the terminal is described, the corresponding base station may perform the operation corresponding to the operation of the terminal. Conversely, when the operation of the base station is described, the corresponding terminal may perform the operation corresponding to the operation of the base station.

A transport channel in a physical layer upper layer used in the random access process in 3GPP LTE, LTE-A, and 3GPP 5G NR is a random access channel (hereinafter referred to as 'RACH'), in the time domain A physical channel of the RACH mapped to the physical layer as a radio resource directly allocated to the frequency domain and the frequency domain is referred to as a physical random access channel (hereinafter referred to as 'PRACH'). RACH is a random access preamble (preamble) by the terminal to the base station in a random access process in which the terminal performs initial timing synchronization with the base station, power control, uplink resource request, handover, etc. in order to access the base station ) may be used as an uplink control channel used to transmit.

The random access procedure is initiated by the base station, and the terminal transmits a random access preamble to the base station. Thereafter, the base station transmits a random access response to the terminal in response to the random access preamble. Thereafter, the terminal and the base station exchange a downlink data channel such as an uplink shared channel (UL-SCH) uplink data channel and a downlink shared channel (DL-SCH) including signaling information, and a radio link to meet the requirements of the terminal. can be connected

Random access preambles transmitted by a plurality of terminals to the base station collide with each other while a plurality of terminals attempt random access to the base station, so that the random access process may not be smoothly performed. In order to reduce the collision probability, in a mobile communication system such as LTE, the number of slots (or subframes) capable of random access in the time domain is increased, or the number of radio resources for a random access channel is increased in the frequency domain. It is increasing the chance of successful random access of the terminals by securing the random access multi-channel operation like this reduces the probability of collision between the random access preambles transmitted by a plurality of terminals, thereby delaying the access of the terminal to the base station time can be reduced.

2 is a view showing a frame structure.

Referring to FIG. 2 , one resource block may be configured in the frequency domain with 12 resource elements. In this case, as an example, Numerologies may be variously configured to satisfy various services and requirements of the NR system. As an example, the numerology may be defined based on subcarrier spacing (SCS) used in an Orthogonal Frequency Division Multiplexing (OFDM) system, a CP length, and the number of OFDM symbols per slot.

Also, as an example, in relation to a normal slot in the NR system, the number of OFDM symbols may be basically 14. In this case, the basic slot may be a basic time unit used to transmit data and control information. Also, as an example, unlike a slot, a subframe has an absolute time length corresponding to 1 ms in the NR system and may be used as a reference time for the length of another time interval. In this case, for the coexistence of LTE and the NR system, a time interval such as a subframe of LTE may be required for the NR standard. For example, in LTE, data may be transmitted based on a Transmission Time Interval (TTI), which is a unit time, and the TTI may be configured in units of one or more subframes. At this time, even in LTE, one subframe may be set to 1 ms, and 14 OFDM symbols (or 12 OFDM symbols) may be included.

Hereinafter, a power ramping procedure will be described in consideration of the above-described environment.

The WI (Work Item) for NR of 3GPP is targeted to design an NR system that meets the 5G requirements. In 3GPP NR, a plurality of beam operations may be applied based on hybrid beamforming to improve system performance. In this case, a physical random access channel (PRACH) including a message design design and a random access procedure (RA procedure) may be considered to enable a multi-beam operation. In this case, as an example, related contents are described in Prior Documents 1 to 5 below with respect to the design of a Synchronization Signal (SS) and a Physical Random Access Channel (PRACH), but the present disclosure is not limited thereto.

- Prior Document 1: 3GPP TR 38.802, "Study on New Radio (NR) Access Technology; Physical Layer Aspects," Rel. 14, Feb. 2017.

- Prior Document 2: 3GPP Chairman's notes, RAN1 #89, May 2017.

- Prior Document 3: 3GPP Chairman's notes, RAN1-NR#2, June 2017.

- Prior Document 4: 3GPP Chairman's notes, RAN1 #90, Aug. 2017.

- Prior Document 5: 3GPP Chairman's notes, RAN1-NR#3, Sep. 2017.

In this case, as an example, FIG. 3 is a diagram illustrating a multi-beam transmitter (Tx) in a base station. In this case, as an example, the base station may be a base station in NR (New Radio) as a gNB, but is not limited thereto. In this case, the transmission beams of all base stations may be grouped. In addition, N beams may be included in each group. As an example, although three beam groups are illustrated in FIG. 3 , the present invention is not limited thereto.

4 is a diagram illustrating an NR SSB structure. In this case, referring to FIG. 4 , since beam sweeping is based on analog beamforming, the SS burst set may be designed to include a plurality of SS bursts in the time domain. In this case, the SS burst may correspond to each beam group in FIG. 3 . Also, in each SS burst, a plurality of SS blocks may be positioned to correspond to different beams in a beam group. For example, one SS burst set may include one or a plurality of SS bursts, and one SS burst may include one or a plurality of SS blocks. Thus, FIG. 4 may be a joint SS structure suitable for both single-beam and multi-beam operations.

Also, as an example, the terminal may transmit message 1 to the base station in the random access procedure. In this case, when the base station receives message 1 from the terminal, a plurality of time domain RACH resources may be considered to support the receiving end (Rx) beam sweeping of the base station. That is, the UE may perform message 1 transmission through a plurality of time domain RACH resources. As an example, the RACH resource may indicate a time/frequency resource set. In this case, as an example, the time/frequency resource set may support only one preamble format including only one preamble sequence. Also, as an example, the time/frequency resource set may support one preamble in one preamble format including a plurality of preamble sequences. In this case, as an example, the preamble format and the preamble corresponding to the time/frequency resource set may be implemented based on different methods. For example, based on the aforementioned prior documents 1 to 5, the RACH resource may include all or part of the RACH transmission occasion in the time domain. In addition, the length or position of the RACH resource in the frequency domain may be the same in the RACH transmission occasion. In this case, as an example, one RACH resource may correspond to one receive beam direction in the base station. Since the reception beam of the base station is swept, the base station may receive one or a plurality of preambles from the terminal through one RACH resource. Through this, the base station can determine the most appropriate reception beam direction for a specific terminal.

Also, as an example, when beam correspondence does not exist in terms of the base station, the terminal needs to report an optimal downlink transmission beam to the base station through message 1 . In this case, association between SSBs and RACH resources/preamble indices may be used for beam index reporting. Hereinafter, several RACH resource configuration methods and a corresponding SSB and RACH resource/preamble index association method will be described to enable the above-described index reporting mechanism. As an example, the following may be applied to a 3GPP NR system and a future 5G system, and is not limited to the above-described embodiment.

Also, the definitions used below may be the same as definitions in 3GPP NR and in other reports issued by 3GPP, and the like. Also, single-beam operation can be considered as a special case of multi-beam operation. In addition, the following embodiments are equally applicable to the single-beam operation, and are not limited to the above-described embodiments. However, below, the embodiment will be described based on the multi-beam operation. In addition, as an example, the following operation of the present invention may be applied or changed in the same manner to other multi-beam systems other than 3GPP, and is not limited to the above-described embodiment.

definition

In the following, “#” may mean “number”. In addition, “FX” may indicate frequency allocation for the X-th RACH resource. In this case, the X-th frequency allocation may be an allocation for one or a plurality of PRBs (Physical Resource Block) in the frequency domain. Also, below, the X-th SSB may be referred to as “SX”. In addition, “LX” may indicate the location of the X-th RACH candidate resource. In addition, in FIGS. 5 to 7 , the beam direction may indicate only a relationship with respect to the directions between the transmission beam and the reception beam, and may not indicate an area or a gain for the above-described beams.

는 기지국에서 전송 빔의 수일 수 있다. 또한,

는 기지국에서 수신 빔의 수일 수 있다. 일 예로, 하나의 송신 빔의 커버리지는 두 개의 이웃하는 수신 빔들의 커버지리를 가로질러서 설정될 수 있다. 이때, Tx 빔을 바운더리 Tx 빔(Boundary Tx beam)으로 지칭할 수 있다. 유사하게 하나의 수신 빔의 커버리지는 두 개의 이웃하는 송신 빔들의 커버리지를 가로질러서 설정될 수 있다. 이때, Rx 빔을 바운더리 Rx 빔(Boundary Rx beam)으로 지칭할 수 있다. 일 예로, 도 6에서 Tx 빔 1 및 Tx 빔 M은 상술한 바운더리 Tx 빔일 수 있다. 또한, 일 예로, 도 7에서 Rx 빔 1 및 Rx 빔 M은 상술한 바운더리 Rx 빔일 수 있다. 이때, 일 예로, 기지국에서 수신 빔의 방향과 전송 빔의 방향이 일치하지 않는 문제로써, 기지국에서 Tx-Rx 빔의 미스매칭(mismatching) 문제를 고려하여 하기 내용을 서술한다. 이때, 일 예로, 하기 도면은 실용 시스템(practical system)에서 RACH 자원 위치를 의미하지 않는다, 이때, 실용 시스템에서 이용 가능한 RACH 자원들은 시간 도메인 및/또는 주파수 도메인에서 할당될 수 있다. 하기에서는 모든 이용 가능한 RACH 자원들을 고려하여 SSB와 RACH 매핑 연관을 제안한다. 이때, 일 예로, 설명의 편의를 위해 상술한 이용 가능한 RACH 자원들에 대해서 시간/주파수 갭을 하기 도면에서 생략하지만 이에 한정되는 것은 아니다. 또한, 실용 네트워크 구현을 고려하여 시간 도메인에서 바운더리 빔을 위해 오버랩되는 RACH 자원은 0, 하나 또는 복수 개일 수 있으며, 상술한 실시예로 한정되지 않는다. 하기에서는 상술한 바에 기초하여 구체적인 실시예를 서술한다.Also, as an example, it may be assumed that the base station transmit beam sweeping starts from Tx beam 1 below, but is not limited thereto. In addition, it may be assumed that the reception beam also starts from Rx beam 1, but is not limited thereto. In this case, Tx beam 1 to Tx beam M may be transmitted in correspondence from SSB 0 to SSB M-1. At this time,

may be the number of transmission beams in the base station. In addition,

may be the number of receive beams in the base station. For example, the coverage of one transmission beam may be set across the coverage of two neighboring reception beams. In this case, the Tx beam may be referred to as a boundary Tx beam. Similarly, the coverage of one receive beam may be established across the coverage of two neighboring transmit beams. In this case, the Rx beam may be referred to as a boundary Rx beam. For example, in FIG. 6 , Tx beam 1 and Tx beam M may be the above-described boundary Tx beams. Also, as an example, Rx beam 1 and Rx beam M in FIG. 7 may be the above-described boundary Rx beams. In this case, as an example, as a problem in which the direction of the reception beam and the direction of the transmission beam do not match in the base station, the following content is described in consideration of the mismatching problem of the Tx-Rx beam in the base station. In this case, as an example, the following figure does not mean a RACH resource location in a practical system. In this case, RACH resources available in the practical system may be allocated in a time domain and/or a frequency domain. In the following, SSB and RACH mapping association is proposed in consideration of all available RACH resources. In this case, as an example, a time/frequency gap for the above-described available RACH resources is omitted from the drawings for convenience of description, but is not limited thereto. In addition, in consideration of the practical network implementation, the number of overlapping RACH resources for the boundary beam in the time domain may be zero, one, or a plurality, and is not limited to the above-described embodiment. Hereinafter, specific examples will be described based on the above description.

Embodiment 1 (when the carrier frequency is less than 6 GHz, SSB and RACH resource associations and related RACH configuration contents)

=인 경우) Example 1-1 (

= if)

인 경우를 고려할 수 있다. 일 예로, 도 5를 참조하면 6GHz 미만의 캐리어 주파수의 경우에 기지국 측면에서 전송 빔들 및 수신 빔들 모두를 위한 다중-빔 방향들을 고려할 수 있다. 일 예로, 도 5에서는 전송 빔들 수 및 수신 빔들의 수를 모두 8개로 가정할 수 있다. 다만, 이는 하나의 일 예시일 뿐, 이에 한정되는 것은 아니다. 이때, 단말이 랜덤 엑세스 절차에서 메시지 1을 전송하기 이전에 기지국은 SS 버스트 셋을 단말들로 브로드캐스트할 수 있다. 일 예로, 브로드캐르트되는 SSB 버스트 셋은 8개의 SSB들 및 서로 다른 SSB 인덱스에 기초하여 SSB를 전송하는 각각의 기지국 전송 빔이 포함될 수 있다. 이때, SSB 전송들과 관련하여, 기지국은 8개의 SSB들은 시간 도메인에서 전송 빔 스위칭을 통해 연속적으로 전송할 수 있다. 이때, 일 예로, 도 5를 참조하면, 단말 A(510)은 “S0”을 먼저 수신할 수 있다. 또한, 단말 B(520)는 빔 스위칭에 기초하여 “S1”을 나중에 수신할 수 있다. 즉, 서로 다른 빔들의 커버리지를 고려하여 빔이 수신될 수 있다. Based on the above description, a case in which the number of transmit beams and the number of receive beams are the same in the base station may be considered. in other words,

case can be considered. For example, referring to FIG. 5 , in the case of a carrier frequency of less than 6 GHz, multi-beam directions for both transmit beams and receive beams may be considered at the base station side. For example, in FIG. 5 , it may be assumed that the number of transmission beams and the number of reception beams are all 8. However, this is only one example, and is not limited thereto. In this case, before the terminal transmits message 1 in the random access procedure, the base station may broadcast the SS burst set to the terminals. For example, the broadcast SSB burst set may include 8 SSBs and each base station transmission beam for transmitting the SSB based on different SSB indexes. In this case, with respect to SSB transmissions, the base station may continuously transmit eight SSBs through transmission beam switching in the time domain. In this case, as an example, referring to FIG. 5 , the terminal A 510 may first receive “S0”. Also, the terminal B 520 may receive “S1” later based on the beam switching. That is, beams may be received in consideration of coverages of different beams.

In this case, as an example, when the directions of the base station transmission beams exactly match the directions of the reception beams, the SSB and RACH resource mapping may be as shown in FIG. 8 . In this case, through the above-described mapping, the UE may implicitly inform the base station of an appropriate downlink transmission beam direction by using the RACH resource. That is, when the UE receives “S0”, the UE may transmit message 1 through the RACH resource allocated for “S0” in the random access procedure. Through this, the base station can detect the preamble of the terminal and check the RACH resource used for message 1 transmission. Through this, the base station can confirm that the terminal is in the coverage of Tx/Rx beam 1. That is, when the number of transmission beams and the number of reception beams are the same, the terminal transmits message 1 based on the received transmission beams, and the base station can confirm the location of the terminal.

In this case, for example, when the directions of the transmission beams and the reception beams of the base station do not match as in FIG. 5 , the terminal may not report an appropriate transmission beam based on the mapping of FIG. 8 . In this case, in consideration of the above-described case, the report may be performed based on the following method.

Example 1-1-1 (Alternative 1, using the same preamble sequence for different SSBs)

Considering the above, first, the UE may perform message 1 transmission using a plurality of RACH resources in the time domain. In this case, preamble sequences corresponding to different SSBs may be the same. That is, the same preamble sequence may be transmitted through different SSBs. In this case, different RACH resource positions may be used to distinguish different SSBs from the viewpoint of the base station. That is, since it is the same preamble, each SSB can be distinguished based on the RACH resource location.

For example, referring to FIG. 9 , SSB and RACH resource mapping may be considered based on the above description. In this case, a plurality of RACH resources associated with one SSB in the time domain may be continuously located. In this case, since preambles transmitted from the same terminal are received from adjacent reception beams, the base station can identify an appropriate downlink beam through the RACH resources used for the terminal. For example, in the case of FIG. 5 , the terminal A 510 may transmit message 1 of “S0” of FIG. 9 through two RACH resources. In addition, the MS B 520 may transmit message 1 to “S1” of FIG. 9 through two RACH resources. At this time, when the base station performs receive beam sweeping at the beam sweeping timing disclosed in FIG. 9 , the terminal transmits message 1 of terminal A 510 and message 1 of terminal B 520 in different RACH resources through Rx beam 2 can be detected. Accordingly, the base station can recognize an appropriate downlink beam for each terminal.

Example 1-1-2 (Alternative 2, using different preamble sequences for different SSBs)

As another example, the UE may transmit message 1 through a plurality of RACH resources in the time domain. In this case, preamble sequences for different SSBs may be different from each other. That is, a different preamble may be used for each SSB. In this case, the preamble sequence groups may be allocated to different groups. In this case, from the viewpoint of the base station, preamble sequence groups may be used to distinguish different SSBs.

As an example, referring to FIG. 10 , when the mapping of SSB and RACH resources is considered, a plurality of RACH resources may be continuously allocated in association with one SSB in the time domain. In this case, as an example, the terminal A 510 of FIG. 5 may transmit message 1 through two RACH resources for “S0” of FIG. 9 . Also, UE B 520 of FIG. 5 may transmit message 1 through two RACH resources for “S1”. In this case, the base station may sweep the reception beam at the beam sweeping timing illustrated in FIG. 10 . In this case, the preamble of the terminal A 510 and the preamble of the terminal B 520 may be generated through sequences of different sequence groups. Accordingly, the base station may detect the message 1 of the terminal A 510 and the message 1 of the terminal B 520 through the Rx beam 2. Accordingly, the base station can recognize an appropriate downlink beam for each terminal.

As another example, a plurality of RACH resources may be associated with the same SSB based on a different implementation method for each base station. In this case, a plurality of RACH resources may be distributed and allocated in the time domain. As an example, consecutive RACH resources are as described above. On the other hand, the aforementioned alternatives 1 and 2 may be applied to the distributed and allocated RACH resources, and the embodiment is not limited thereto.

In this case, as an example, if the above-described alternatives 1 and 2 are compared, the case of alternative 1 may be used with twice as many RACH resources allocated in the time domain. For example, in the case of the alternative 1, a delay of the random access procedure may occur based on the above-mentioned description than in the alternative 2. On the other hand, in the case of alternative 2, it is possible to save RACH resources in the time domain. However, since all available preamble sequences must be grouped and allocated to different SSBs, and one RACH resource must be used in two SSBs, interference may have a greater impact than alternative 1. In this case, from the viewpoint of the terminal, the power consumption of the terminal may be smaller in the alternative 1 than in the alternative 2. That is, in the case of the alternative 2, different interference levels must be considered for each RACH resource, so power consumption may be greater from the viewpoint of the UE. Accordingly, the method among the above-described alternatives 1 and 2 may be set in consideration of the circumstances of the terminal and the base station, and is not limited to the above-described embodiment. In addition, the information on the aforementioned alternatives 1 and 2 may be shared to the terminal through at least one of system information, higher layer information, and L1/L2, and is not limited to the above-described embodiment.

인 경우) Example 1-2 (

if)

인 경우를 고려할 수 있다. 이때, SSB와 RACH 자원 매핑은 도 11과 같을 수 있다. 일 예로, 상술한 대안 1로서 서로 다른 SSB에 동일한 프리앰블 시퀀스가 이용되는 경우에 도 11과 같은 자원 매핑이 이용될 수 있다. 따라서, 두 개의 인접한 RACH 자원들은 Tx 빔 1 및 Tx 빔 M을 위해 할당되고, 하나의 RACH 자원은 다른 논-바운더리 Tx 빔들을 위해 할당될 수 있다.Referring to FIG. 6 , a case in which the number of transmit beams is greater than the number of receive beams may be considered from the viewpoint of the base station. in other words,

case can be considered. In this case, the SSB and RACH resource mapping may be as shown in FIG. 11 . As an example, as the aforementioned alternative 1, when the same preamble sequence is used for different SSBs, the resource mapping shown in FIG. 11 may be used. Accordingly, two adjacent RACH resources may be allocated for Tx beam 1 and Tx beam M, and one RACH resource may be allocated for other non-boundary Tx beams.

Also, as an example, when different preamble sequences are used for different SSBs as the aforementioned alternative 2, resource mapping as shown in FIG. 12 may be used. In this case, as boundary transmission beams, Tx beam 1 and Tx beam M may be allocated to two adjacent RACH resources in order to solve the Tx-Rx beam mismatch problem.

In this case, as an example, in RACH configuration for terminals, a case in which message 1 for each terminal is allocated to RACH resources may be considered. For example, when message 1 is allocated to each of RACH resources as shown in FIG. 11, the number of bits for RACH configuration may increase. In this case, in the NR system, RACH configuration information may be included in Remaining Minimum System Information (RMSI), and RMSIs for transmission beams of all base stations may be the same. Accordingly, when all resource mapping information is included in the RMSI in consideration of the case of FIG. 11, a burden may increase in the RMSI. That is, since the boundary beam and the non-boundary beam occupy different numbers of RACH resources, the start position of the RACH resource for each SSB is set through RMSI, and the length of the RACH resource for each SSB is indicated. there is a need to Accordingly, information to be included in the RMSI may increase.

In this case, as an example, FIG. 11 may be changed as shown in FIG. 13 in order to reduce the burden of RACH configuration. More specifically, in FIG. 13 , all SSBs may be allocated to two RACH resources and transmitted regardless of whether they are boundary beams or non-boundary beams. Comparing FIG. 13 with FIG. 11, the random access procedure is delayed and power consumption may increase when the terminal transmits message 1, but as described above, the burden of RACH configuration may be reduced.

인 경우) Example 1-3 (

if)

As another example, a case in which the number of transmit beams is smaller than the number of receive beams from the viewpoint of the base station as shown in FIG. 7 may be considered. In this case, considering the case of the aforementioned alternative 1, the mapping of SSB and RACH resources may be as shown in FIG. 14 . In this case, as an example, referring to FIG. 7 , the boundary reception beams may be Rx beam 1 and Rx beam M. In this case, as an example, the Rx beam sweeping timing of the boundary reception beam may be different from other non-boundary beams. It is necessary to consider two transmission beams crossing the boundary reception beam of the base station, and it is necessary to monitor two RACH resources.

Also, as an example, FIG. 15 may be SSB and RACH resource mapping in consideration of the case of alternative 2 described above. In this case, the base station may make the reception beam sweeping timing the same. On the other hand, the RACH resource monitored by the boundary reception beam may be allocated to two adjacent transmission beams.

Embodiment 1-4 (RACH resource setting considering different mappings)

From a network point of view, in the case of less than 6 GHz as in Embodiment 1, the base station may include the parameters of Table 1 below in the RMSI and provide it to the terminal. That is, necessary information may be provided to the terminal in consideration of the above-described embodiments 1-1 to 1-3.

[Table 1]

Embodiment 2 (when the carrier frequency is more than 6 GHz, SSB and RACH resource associations and related RACH configuration contents)

Considering the case of exceeding 6 GHz, frequency domain duplexing of RACH resources may be considered in designing SSB and RACH resource mapping. This is because a larger number of beams can be considered from a base station point of view. In the following, alternative 1 will be described as a mapping method in consideration of the case of exceeding 6 GHz, and alternative 1 may consider the conditions of Table 2 below.

[Table 2]

Also, as an example, alternative 2 may be the same as alternative 2 of the case below 6 GHz of the above-described embodiment 1 above 6 GHz. That is, the same mapping method may be applied to each FX, and it is not limited to the above-described embodiment.

인 경우) Example 2-1 (

if)

Considering the aforementioned alternative 1, different RACH resources may be used for transmission beams of different base stations. For example, in FIG. 16 , a case in which the total number of transmitted SSBs is 24 may be considered. However, this is only one example, and is not limited to the above-described embodiment. At this time, FIG. 16 shows the SSB and RACH resource mapping for the above-described case. For example, in the case of alternative 1, a case in which two PRBs are allocated and mapped in the frequency domain to solve the Tx-Rx beam mismatch problem may be considered. For example, referring to FIG. 16 , two RACH resources for two “S0” may be mapped to “F0”. In addition, two RACH resources for “S1” may be mapped to “F1”. In this case, RACH resources for “S0” and “S1” in the time domain may overlap in the second RACH resource. In this case, the same RACH resource mapping method may use the remaining SSBs mapping method.

In this case, cyclic prefix may be considered in order to conserve RACH resources of different PRB carriers aligned in the time domain. For example, in FIG. 16, “L1”, “L2” and “L3” may indicate three RACH candidate resources for “S7”, “S15” and “S23”. At this time, as a case in which the base station includes three transmit/receive points (TRPs) in the spatial domain, a case in which each TRP includes eight transmit beams may be considered. However, this is only one example and is not limited to the above-described embodiment. In this case, for example, Tx beam 1 and Tx beam 8 may be adjacent to TRP 1. Also, Tx beam 9 and Tx beam 16 may be adjacent in TRP 2 . Also, Tx beam 17 and Tx beam 24 may be adjacent in TRP 3 . Accordingly, as shown in FIG. 17 , “S7” may be mapped to “L1”, “S15” may be mapped to “L2”, and “S23” may be mapped to “L3”. On the other hand, considering that the base station includes only one TRP in the spatial domain and the number of beams is 24, Tx beam 24 and Tx beam 1 may be adjacent. In this case, referring to FIG. 18 , “S7” may be mapped to “L2”, “S15” may be mapped to “L3”, and “S23” may be mapped to “L1”.

Also, as an example, FIG. 19 is a case in which 64 SSBs are transmitted, and may show all SSBs and RACH resource associations. At this time, similar to the above, “S21”, “S43” and “S63” may be mapped to RACH resources “L1”, “L2” and “L3” through cyclic prefix.

인 경우) Example 2-2 (

if)

Also, as an example, the case shown in FIG. 7 may be considered as a case in which the number of transmit beams is smaller than the number of receive beams. In this case, as an example, a specific mapping method based on the aforementioned alternative 1 may be the same as in FIGS. 20 and 21 . In this case, referring to FIG. 20 , RACH resources for one SSB may be mapped to one PRB in the frequency domain. In this case, in the above-described mapping method, the terminal can reduce power consumption. In addition, it can be applied to the previous mapping method. However, based on FIG. 20, there may be RACH resources that are empty. Accordingly, in FIG. 21 , RACH resources for one SSB may be mapped to two PRBs in the frequency domain. This consumes more terminal power, but can secure frequency diversity.

Example 2-3 (RACH resource setting considering different mappings)

From a network point of view, in the case of less than 6 GHz as in Embodiment 1, the base station may include the parameters of Table 1 below in the RMSI and provide it to the terminal. That is, necessary information may be provided to the terminal in consideration of the above-described embodiments 2-1 to 2-2.

[Table 3]

22 is a diagram illustrating a method of performing a random access procedure.

Referring to FIG. 22, the base station may determine information included in RACH configuration information in consideration of the SSB and RACH resource correspondence (S2210). may be set differently in the case of less than 6 GHz and in the case of more than 6 GHz. Also, as an example, the preamble corresponding to the SSB may be identically set in the SSBs or may be set differently in each of the SSBs. In this case, the above may be considered in the correspondence between the SSB and the RACH resource. In addition, the SSB and RACH resource correspondence may be differently set based on the number of transmission beams and the number of reception beams from the viewpoint of the base station, as described above. As an example, RACH configuration information may be determined in consideration of the above-described SSB and RACH resource correspondence.

Next, the base station may transmit RACH configuration information to the terminal. (S2220) At this time, for example, the base station may determine information included in the RACH configuration information based on the above description, and inform the terminal of the information. . In this case, as an example, the base station may inform the terminal of the above-described information through the RMSI.

Next, the UE may transmit message 1 in the random access procedure based on the received RACH configuration information (S2330). At this time, as described above with reference to FIGS. 1 to 21, message 1 is for performing a random access procedure. A preamble may be included. In this case, the preamble may correspond to the SSB, and the same preamble may be set to all SSBs or different preambles may be set for each SSB, as described above. In this case, as an example, when considering the multi-beam system as described above, a plurality of SSBs may exist in consideration of beam sweeping, and as described above to perform a random access procedure, SSB and RACH resource correspondence may be considered. .

23 is a diagram illustrating a block diagram of an apparatus.

The apparatus 2300 may include a transmitter 2310 for transmitting a radio signal, a receiver 2320 for receiving a radio signal, and a process 2330 for controlling the transmitter 2310 and the receiver 2320 . In this case, the apparatus 2300 may communicate with an external device through the transmitter 2310 and the receiver 2320 . In this case, as an example, the device may be a terminal, a base station, or other device capable of performing communication. Also, the external device may be another terminal device, a base station, or other device capable of performing communication, and is not limited to the above-described embodiment. That is, downlink and uplink sidelink transmission can be performed, and the embodiment is not limited thereto.

In addition, the terminal device of the present invention described above is not limited to a smartphone as a mobile terminal. For example, the terminal device may be any one of a drone, a vehicle, an IoT device, and other devices. That is, as a device capable of performing communication, it may be a device to which the above-described invention can be applied, and is not limited to the above-described embodiment.

The above-described embodiments of the present invention may be implemented through various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

The detailed description of the preferred embodiments of the present invention disclosed as described above is provided to enable any person skilled in the art to make and practice the present invention. Although the above has been described with reference to the preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below. You will understand that it can be done. Accordingly, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. In addition, although preferred embodiments of the present specification have been illustrated and described above, the present specification is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present specification as claimed in the claims Various modifications may be made by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or perspective of the present specification.

In this specification, both product invention and method invention are described, and the description of both inventions may be supplementally applied as necessary.

In addition, with respect to the present invention, the preferred embodiments have been looked at. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments are to be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

Terminal: 2300 Transmitter: 2310
Receiver: 2320 Processor: 2330

Claims (20)

A method for a terminal to perform a random access procedure in a wireless communication system, the method comprising:
Receiving RACH (Random Access Channel) configuration (Configuration) information from the base station;
Transmitting a first message to the base station based on the received RACH configuration information;
A plurality of preambles corresponding to a plurality of synchronization signal blocks (SSBs) are all the same preamble,
Each of the plurality of SSBs is distinguished based on the location of each of the plurality of RACH resources,
Wherein the first message is transmitted through the plurality of RACH resources in the time domain.
delete The method of claim 1,
When the number of Tx beams and the number of Rx beams of the base station are the same, the first message corresponding to one SSB is transmitted in two consecutive RACH resources.
The method of claim 1,
When the number of Tx beams of the base station is greater than the number of Rx beams, the first message of the SSB corresponding to the boundary transmission beam is transmitted on two consecutive RACH resources, and non-boundary transmission The method of performing a random access procedure, wherein the first message of the SSB corresponding to the beam is transmitted in one RACH resource.
The method of claim 1,
When the number of Tx beams of the base station is smaller than the number of Rx beams, the beam sweeping timing of the boundary reception beam and the non-boundary reception beam sweeping timing are set differently. A method of performing a random access procedure.
A method for a terminal to perform a random access procedure in a wireless communication system, the method comprising:
Receiving RACH (Random Access Channel) configuration (Configuration) information from the base station;
Transmitting a first message to the base station based on the received RACH configuration information;
Each of a plurality of synchronization signal blocks (Synchronization Signal Block, SSB) corresponds to a different preamble,
Each of the plurality of SSBs is distinguished based on preambles,
The first message is transmitted through a plurality of RACH resources in the time domain, a method of performing a random access procedure.
7. The method of claim 6,
When the number of Tx beams and the number of Rx beams of the base station are the same, the first message including a plurality of preambles corresponding to each of the plurality of SSBs is transmitted in one RACH resource , a method of performing a random access procedure.
7. The method of claim 6,
When the number of Tx beams of the base station is greater than the number of Rx beams, the first message including a plurality of preambles corresponding to each of the plurality of SSBs is transmitted in one RACH resource, and ,
The first message of the SSB corresponding to the boundary transmission beam is transmitted in two successive RACH resources, and the first message of the SSB corresponding to the non-boundary transmission beam is transmitted in one RACH resource, performing a random access procedure Way.
7. The method of claim 6,
When the number of Tx beams of the base station is smaller than the number of Rx beams, the first message corresponding to the SSB monitored by the boundary reception beam is transmitted in two consecutive RACH resources, random How to perform the access procedure.
The method of claim 1,
The random access procedure is applied in less than 6 GHz, random access procedure performing method.
A method for a base station to perform a random access procedure in a wireless communication system, the method comprising:
determining information included in RACH configuration information in consideration of a synchronization signal block (SSB) and a random access channel (RACH) resource correspondence;
transmitting the RACH configuration information to a terminal; and
Receiving a first message based on the RACH configuration information from the terminal;
A plurality of preambles corresponding to a plurality of SSBs are all the same preamble,
Each of the plurality of SSBs is distinguished based on the location of each of the plurality of RACH resources,
wherein the first message is received through the plurality of RACH resources in the time domain.
delete 12. The method of claim 11,
When the number of Tx beams and the number of Rx beams of the base station are the same, the first message corresponding to one SSB is transmitted in two consecutive RACH resources.
12. The method of claim 11,
When the number of Tx beams of the base station is greater than the number of Rx beams, the first message of the SSB corresponding to the boundary transmission beam is transmitted on two consecutive RACH resources, and non-boundary transmission The method of performing a random access procedure, wherein the first message of the SSB corresponding to the beam is transmitted in one RACH resource.
12. The method of claim 11,
When the number of Tx beams of the base station is smaller than the number of Rx beams, the beam sweeping timing of the boundary reception beam and the non-boundary reception beam sweeping timing are set differently. A method of performing a random access procedure.
A method for a base station to perform a random access procedure in a wireless communication system, the method comprising:
determining information included in RACH configuration information in consideration of a synchronization signal block (SSB) and a random access channel (RACH) resource correspondence;
transmitting the RACH configuration information to a terminal; and
Receiving a first message based on the RACH configuration information from the terminal;
Each of the plurality of SSBs corresponds to a different preamble,
Each of the plurality of SSBs is distinguished based on preambles,
The first message is received through a plurality of RACH resources in the time domain, a method of performing a random access procedure.
17. The method of claim 16,
When the number of Tx beams and the number of Rx beams of the base station are the same, the first message including a plurality of preambles corresponding to each of the plurality of SSBs is transmitted in one RACH resource , a method of performing a random access procedure.
17. The method of claim 16,
When the number of Tx beams of the base station is greater than the number of Rx beams, the first message including a plurality of preambles corresponding to each of the plurality of SSBs is transmitted in one RACH resource, and ,
The first message of the SSB corresponding to the boundary transmission beam is transmitted in two successive RACH resources, and the first message of the SSB corresponding to the non-boundary transmission beam is transmitted in one RACH resource, performing a random access procedure Way.
In a terminal performing a random access procedure in a wireless communication system,
transmitter;
receiver; and
A processor for controlling the transmitter and the receiver; including,
The processor is
Receives random access channel (RACH) configuration information from the base station through the receiver,
Transmitting a first message to the base station based on the received RACH configuration information,
Each of a plurality of synchronization signal blocks (Synchronization Signal Block, SSB) is distinguished based on a position of each of a plurality of RACH resources, a terminal performing a random access procedure.
A base station for performing a random access procedure in a wireless communication system, the base station comprising:
transmitter;
receiver; and
A processor for controlling the transmitter and the receiver; including,
The processor is
Determine the information included in the RACH configuration information in consideration of the synchronization signal block (Synchronization Signal Block, SSB) and RACH (Random Access Channel) resource correspondence,
Transmitting the RACH configuration information to the terminal through the transmitter, and
Receive a first message based on the RACH configuration information received from the terminal through the receiver,
Each of the plurality of SSBs is a base station that performs a random access procedure, which is distinguished based on the location of each of the plurality of RACH resources.

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