KR20190038324A - Ssb to rach resource associations and related rach configuration contents in a multi-beam system - Google Patents

Abstract

The present invention can provide a method for a terminal to perform a random access procedure in a wireless communication system. The method for a terminal to perform a random access procedure comprises the steps of: receiving random access channel (RACH) setting information from a base station; and transmitting a first message based on the RACH setting information received from the base station, wherein each of a plurality of signal blocks corresponds to a plurality of preambles and the first message can be transmitted through a plurality of RACH resources in a time domain.

Description

[0001] The present invention relates to SSB and RACH resource associations in a multi-beam system, and RACH configuration contents for the SSB and RACH resource associations in a multi-beam system.

The present invention is directed to a method for setting Random Access Channel (RACH) resources for transmission of Message 1 (Msg. 1) during a Random Access (RA) procedure in a multi-beam system.

The present invention also relates to a plurality of synchronization signal blocks (SSBs) and RACH resource association methods in consideration of "Sub-6GHz" and "above-6GHz" carrier frequency cases.

In the following, the present invention will be described based on the 3GPP NR system for convenience of explanation, but the present invention is not limited to the above embodiments.

Recently, discussions are underway for 5G (5G) communication through a program called "IMT for 2020 and beyond". At this time, the 3rd Generation Partnership Project (3GPP) NR (New Radio) system supports various numerology on the time-frequency resource unit basis in consideration of various scenarios, service requirements, and potential system compatibility .

At this time, for example, a resource setting method considering random access message 1 based on 5G requirements is discussed.

It is an object of the present invention to provide a RACH setting and a method of associating SSB and PRACH resources in a multi-beam system.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for solving a problem of overlapping of a transmission beam (Tx beam) and a reception beam (Rx beam) by a no-perfect beam correspondence in a base station.

The present invention aims at providing flexibility to a base station for receiving beam switching.

The present invention aims at using the same mapping 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 setting.

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

It is an object of the present invention to provide a method for reducing the delay that occurs based on the degree-of-freedom of the frequency domain.

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

The present invention is aimed at providing diversity in the frequency domain of the preamble when it is located at the boundary when the number of transmission beams is " above 6 GHz " which is smaller than the number of reception beams.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

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

Also, according to an embodiment of the present invention, a method for a base station to perform a random access procedure in a wireless communication system can be provided. In this case, the method of performing the random access procedure by the base station includes determining information included in the RACH configuration information in consideration of a synchronization signal block (SSB) and a RACH (Random Access Channel) resource correspondence relationship, Transmitting the RACH configuration information to the terminal, and receiving the first message based on the RACH configuration information from the terminal. At this time, each of the plurality of SSBs corresponds to a plurality of preambles, and the first message can be received through a plurality of RACH resources in the time domain.

Also, according to an embodiment of the present invention, a terminal performing a random access procedure in a wireless communication system can be provided. In this case, the terminal may include a processor for controlling the transmitter, the receiver, and the transmitter and receiver. At this time, the processor can receive RACH (Random Access Channel) configuration information from the base station through the receiver, and can transmit the first message based on the RACH configuration information received by the base station. At this time, each of a plurality of synchronization signal blocks (SSB) corresponds to a plurality of preambles, and a first message can be transmitted through a plurality of RACH resources in the time domain.

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

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

Also, according to an embodiment of the present invention, when the number of transmission beams (Tx beams) of the base station is equal to the number of reception beams (Rx beams), a first message corresponding to one SSB is transmitted from two consecutive RACH resources Lt; / RTI >

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

According to an embodiment of the present invention, when the number of transmission beams (Tx beams) of the base station is smaller than the number of reception beams (Rx beams), the beam sweep timing of the boundary reception beam and the non- Can be set.

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

If a number of transmission beams (Tx beams) of the base station is equal to the number of reception beams (Rx beams), a first message including a plurality of preambles corresponding to each of the plurality of SSBs May be transmitted in one RACH resource.

Also, according to an embodiment of the present invention, when the number of transmission beams (Tx beams) of the base station is larger than the number of Rx beams, a first message including a plurality of preambles corresponding to each of the plurality of SSBs The first message of the SSB corresponding to the boundary transmission beam is transmitted on two consecutive RACH resources, the first message of the SSB corresponding to the non-boundary transmission beam is transmitted on one RACH resource, .

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

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

According to the present disclosure, a RACH setup and a method of associating SSB and PRACH resources in a multi-beam system can be provided.

According to the present disclosure, it is possible to provide a method for solving the overlapping problem of a transmission beam (Tx beam) and a reception beam (Rx beam) by a no-mote beam correspondence at 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 can be used for the independence of the base station receive beam.

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

According to the present disclosure, a method of reducing signaling overhead can be provided.

According to the present disclosure, it is possible to provide a method of reducing the delay that occurs based on the degree-of-freedom of the 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, it is possible to provide diversity in the frequency domain of the preamble when it is located at the boundary as " above 6 GHz " when the number of transmission beams is smaller than the number of reception beams.

The effects obtainable from the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below will be.

1 is a diagram showing a communication system.
2 is a diagram 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 shows a case where the number of transmission beams is equal to the number of reception beams.
6 shows a case where the number of transmission beams is larger than the number of reception beams.
7 is a diagram showing a case where the number of transmission beams is smaller than the number of reception beams.
8 is a diagram illustrating a RACH resource mapping when the number of transmission beams is equal to the number of reception beams.
9 is a diagram illustrating a RACH resource mapping when the number of transmission beams is equal to the number of reception beams.
10 is a diagram illustrating RACH resource mapping when the number of transmission beams is equal to the number of reception beams.
11 is a diagram illustrating RACH resource mapping when the number of transmission beams is larger than the number of reception beams.
12 shows RACH resource mapping when the number of transmission beams is greater than the number of reception beams.
13 is a diagram illustrating a RACH resource mapping when the number of transmission beams is larger than the number of reception beams.
14 is a diagram illustrating a RACH resource mapping when the number of transmission beams is smaller than the number of reception beams.
15 is a diagram illustrating a RACH resource mapping when the number of transmission beams is smaller than the number of reception beams.
16 is a diagram showing a RACH resource mapping when the number of transmission beams is larger than the number of reception beams.
17 is a diagram showing RACH resource mapping when the number of transmission beams is larger than the number of reception beams.
18 is a diagram showing a RACH resource mapping when the number of transmission beams is larger than the number of reception beams.
19 is a diagram showing a RACH resource mapping when the number of transmission beams is equal to the number of reception beams.
20 is a diagram showing a RACH resource mapping when the number of transmission beams is smaller than the number of reception beams.
21 is a diagram illustrating RACH resource mapping when the number of transmission beams is smaller than the number of reception beams.
22 is a flowchart illustrating a method of performing a random access procedure.
23 is a diagram 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, and redundant description will be omitted. In the following description of the present invention, 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.

In the following description, well-known functions or constructions are not described in detail since they may obscure the subject matter of the present invention. In the drawings, parts not related to the description of the present invention are omitted, and like parts are denoted by similar reference numerals.

In the present invention, when an element is referred to as being "connected "," coupled ", or "connected" to another element, this means not only a direct connection relationship but also an indirect connection relationship May also be included. Also, when an element is referred to as " comprising "or" having "another element, it is meant to include not only excluding another element but also another element .

In the present invention, the terms first, second, etc. are used only for the purpose of distinguishing one element from another, and the order or importance of the elements is not limited unless otherwise stated. Thus, within the scope of the present invention, the first component in one embodiment may be referred to as a second component in another embodiment, and similarly the second component in one embodiment may be referred to as a first component .

In the present invention, the components that are distinguished from each other are intended to clearly describe the respective features, and do not necessarily mean that the components are separated. That is, a plurality of components may be integrated into one hardware or software unit, or a single component may be distributed into a plurality of hardware or software units. Accordingly, such integrated or distributed embodiments are included within the scope of the present invention, unless otherwise noted.

In the present invention, the components described in the various embodiments are not necessarily essential components, and some may be optional components. Accordingly, embodiments consisting of a subset of the components described in one embodiment are also included in the scope of the present invention. Also, embodiments that include other components in addition to the components described in the various embodiments are also included in the scope of the present invention.

1 is a diagram showing 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 may be a communication network based on a code division multiple access (CDMA) based communication protocol, a wideband CDMA (WCDMA) based communication protocol, a communication based on time division multiple access (TDMA) ) Based communication protocol, an orthogonal frequency division multiplexing (OFDM) based communication protocol, an orthogonal frequency division multiple access (OFDMA) based communication protocol, a single carrier-based communication protocol based on FDMA, a non-orthogonal multiple access ) Based communication protocol, a space division multiple access (SDMA) based communication protocol, and the like. Each of the plurality of communication nodes may have the following structure and is not limited to the above-described embodiment.

In addition, for 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. Also, certain operations described as being performed by the base station may be performed by an upper node of the base station, as the case may be. That is, various operations performed for communication with a mobile station in a network consisting of a plurality of network nodes including a base station are referred to as base station operation.

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

A mobile station (MS) may be a user equipment (UE), a subscriber station (SS), a mobile terminal or a station, and will be referred to as a base station .

In the uplink, the mobile station may be a transmitting terminal, the base station may be a receiving terminal, the downlink may be a mobile station, and the base station may be a transmitting terminal.

Further, an indication that a device performs communication with a " cell " may mean that the device transmits and receives signals with the base station of the corresponding cell. That is, although a practical object to which a device transmits and receives a signal may be a specific base station, it may be described as transmitting and receiving signals with a cell formed by a specific base station for convenience of description. Similarly, the description 'macro cell' and / or 'small cell' may mean specific coverage, and may also refer to a 'macro cell supporting a macro cell' and / or a 'small cell supporting a small cell' Base station '.

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

1, the communication system 100 includes a plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2, a plurality of terminals user equipment 130-1, 130-2, 130-3, 130-4, 130-5, and 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 to 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.

Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1 and 120-2 includes a Node B, an evolved Node B, a next-generation Node B, A base transceiver station (BTS), a radio base station, a radio transceiver, an access point, an access node, a roadside unit (RSU), a digital unit (DU) , 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, Each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 includes a terminal, an access terminal, a mobile terminal, 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, Each may support cellular communication (e.g., long term evolution (LTE), advanced (LTE-A), 3GPP 5G NR (New Radio), etc. defined in the 3rd generation partnership project . 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 via an ideal backhaul or a non-ideal backhaul, Or non-idle 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 idle backhaul or a non-idle 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, 130 130-2, 130-3, 130-4, 130-5, and 130-6, and transmits the signals received from the terminals 130-1, 130-2, 130-3, 130-4, Lt; / RTI >

Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 can support downlink transmission based on OFDMA, and uplink ) Transmission. Also, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may perform multiple input multiple output (MIMO) transmission (for example, MIMO, MIMO, MIMO, Coordinated Multipoint (CoMP), Carrier Aggregation, Unlicensed Band, Device to Device (D2D) Each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 may support communication (or ProSe (proximity services) (110-1, 110-2, 110-3, 120-1, 120-2) corresponding to the base stations 110-1, 110-2, 110-3, 120-1, Supported actions can be performed.

For example, the second base station 110-2 can transmit a signal to the fourth terminal 130-4 based on the SU-MIMO scheme, and the fourth terminal 130-4 can transmit a signal based on the SU-MIMO scheme And may receive a signal 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, the fourth terminal 130-4, And the fifth terminal 130-5 may receive signals from the second base station 110-2 by the MU-MIMO scheme. Each of the first base station 110-1, the second base station 110-2 and the third base station 110-3 can transmit a signal to the fourth terminal 130-4 based on the CoMP scheme, The terminal 130-4 can 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 terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6) and the CA scheme. 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, the fourth terminal 130-4 and the fifth terminal 130-5 may be coordinated by the coordination 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 (for example, transmission or reception of a signal) to be performed in the first communication node among the communication nodes is described, the corresponding second communication node is equivalent to the method performed in the first communication node (E.g., receiving or transmitting a signal).

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

A transport channel in a physical layer higher layer used in a random access procedure in 3GPP LTE, LTE-A and 3GPP 5G NR is a random access channel (RACH) And the physical channel of the RACH mapped to the physical layer as a radio resource directly allocated in the frequency domain is referred to as a physical random access channel (PRACH). The RACH is a random access preamble in which the UE transmits a random access preamble to the base station in a random access procedure for initial timing synchronization with the base station, power control, uplink resource request, handover, As shown in FIG.

The random access procedure is initiated by the base station, and the terminal transmits the random access preamble to the base station. The base station then transmits a random access response to the terminal in response to the random access preamble. Then, the MS and the BS exchange UL-SCH (Uplink shared channel) uplink data channels including signaling information and downlink data channels such as DL-SCH (Downlink shared channel) .

The random access preamble transmitted from a plurality of terminals to the base station may collide with each other during a process in which a plurality of terminals attempt random access to the base station, so that a random access procedure may not be performed smoothly. In order to reduce the probability of occurrence of such a collision, 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 the random access channel in the frequency domain is increased The number of collisions between random access preambles transmitted from a plurality of UEs is reduced by using the random access multi-channel operation, and a collision probability between random access preambles transmitted from a plurality of UEs is reduced through the random access multi- Time can be reduced.

2 is a diagram showing a frame structure.

Referring to FIG. 2, one resource block may be configured in the frequency domain with 12 resource elements. At this time, for example, Numerologies may be variously configured to satisfy various services and requirements of the NR system. For example, the NM can be defined based on Subcarrier Spacing (SCS) used in an Orthogonal Frequency Division Multiplexing (OFDM) system, the CP length, and the number of OFDM symbols per slot.

Also, for example, in the NR system, the number of OFDM symbols may be basically 14 with respect to the normal slot. At this time, the basic slot may be a basic time unit used for transmitting data and control information. In addition, for example, a subframe different from a slot may have an absolute time length corresponding to 1 ms in the NR system and may be utilized as a reference time for a length of another time interval. At this time, for the coexistence of the LTE and the NR system, the same time period as the LTE subframe may be required for the NR standard. For example, in LTE, data can be transmitted based on a transmission time interval (TTI), which is a unit time, and the TTI can be configured in one or more subframe units. At this time, in LTE, one subframe may be set to 1 ms, and 14 OFDM symbols (or 12 OFDM symbols) may be included.

The power ramping procedure will be described below in consideration of the above environment.

The Work Item (WI) for 3GPP NR is targeted at designing an NR system that meets the 5G requirements. In 3GPP NR, multiple beam operations may be applied based on hybrid beamforming to improve system performance. At this time, a Physical Random Access Channel (PRACH) and a Random Access Procedure (RA procedure) including a message design design can be considered to enable multi-beam operation. In this case, for example, regarding Synchronization Signal (SS) and Physical Random Access Channel (PRACH) design, the following contents are described in the following Prior Art Documents 1 to 5, but the present invention is not limited thereto.

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

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

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

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

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

In this case, for example, FIG. 3 shows a multi-beam transmission terminal (Tx) in a base station. In this case, for example, the base station may be a gNB and a base station in NR (New Radio), but is not limited thereto. At this time, the transmission beams of all base stations may be grouped. Also, N beams may be included in each group. For example, three beam groups are shown in FIG. 3, but the present invention is not limited thereto.

4 is a diagram showing an NR SSB structure. Referring now to FIG. 4, the SS burst set may be designed to include a plurality of SS bursts in the time domain, since beam sweeping is based on analog beamforming. At this time, the SS bursts may correspond to the respective beam groups in FIG. Also, in each SS burst, a plurality of SS blocks may be located corresponding to different beams in the beam group. As an example, one SS burst set may include one SS burst or one SS burst, and one SS burst may include one or a plurality of SS blocks. Thus, Figure 4 may be a joint SS structure suitable for both single-beam and multi-beam operations.

In addition, for example, the UE may transmit the message 1 to the BS in the random access procedure. At this time, when the BS receives the message 1 from the MS, it may consider a plurality of time domain RACH resources to support beam sweeping of the Rx of the BS. That is, the UE can 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, for example, the time / frequency resource set may support only one preamble format including only one preamble sequence. In addition, for example, the time / frequency resource set may support one preamble in one preamble format including a plurality of preamble sequences. In this case, for 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 foregoing prior arts 1 to 5, the RACH resource may include all or some of the RACH transmission aids in the time domain. Also, the length or location of the RACH resources in the frequency domain may be the same in the RACH transmission occasion. At this time, for example, one RACH resource may correspond to one reception beam direction at the base station. The reception beam of the base station is swept, and the base station can receive one or a plurality of preambles from the terminal through one RACH resource. This allows the base station to identify the most appropriate receive beam direction for a particular terminal.

Also, for example, if there is no beam correspondence on the side of the base station, the terminal needs to report the optimal downlink transmission beam to the base station via message 1. [ At this time, the association between SSBs and RACH resources / preamble indices may be used for beam index reporting. Hereinafter, some RACH resource configuration methods and corresponding SSB and RACH resource / preamble index association methods are described in order to enable the above-described index reporting mechanism. For example, the following contents are applicable to the 3GPP NR system and the future 5G system, and are not limited to the above-described embodiments.

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

Notation

In the following, "# " may mean " number ". Also, " FX " can indicate frequency allocation for the Xth RACH resource. In this case, the Xth frequency allocation may be allocation for one or a plurality of physical resource blocks (PRB) in the frequency domain. In the following, the Xth SSB can be referred to as " SX ". Also, " LX " can indicate the location of the Xth RACH candidate resource. 5 to 7, the beam direction may only indicate the relationship between the directions between the transmission beam and the reception beam, and may not indicate the area or gain for the above-mentioned 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, for example, it is assumed that base station transmission beam sweeping starts from Tx beam 1 (Tx beam 1), but the present invention is not limited thereto. Also, it is assumed that the reception beam starts from Rx beam 1 (Rx beam 1), but it is not limited thereto. At this time, Tx beam 1 to Tx beam M can be transmitted corresponding to SSB 0 to SSB M-1. At this time,

May be the number of transmission beams at the base station. Also,

May be the number of receive beams at the base station. In one example, the coverage of one transmit beam may be set across the cover geography of two neighboring receive beams. At this time, the Tx beam can be referred to as a boundary Tx beam. Similarly, the coverage of one receive beam may be set across the coverage of two neighboring transmit beams. At this time, the Rx beam can be referred to as a boundary Rx beam. As an example, in FIG. 6, Tx beam 1 and Tx beam M may be the above-described boundary Tx beam. Also, in one example, Rx beam 1 and Rx beam M in FIG. 7 may be the boundary Rx beam described above. In this case, for example, a problem of mismatch between the direction of the reception beam and the direction of the transmission beam at the base station is considered, and the following description will be made considering the mismatching problem of the Tx-Rx beam at the base station. In this case, for example, the following drawings do not refer to a RACH resource position in a practical system. At this time, RACH resources available in a practical system may be allocated in a time domain and / or a frequency domain. In the following, SSB and RACH mapping associations are proposed considering all available RACH resources. In this case, for example, the time / frequency gap for the above-described available RACH resources is not shown in the drawings but is not limited thereto. In addition, considering the practical network implementation, the RACH resources overlapping for the boundary beam in the time domain may be zero, one or more, and are not limited to the above-described embodiments. Hereinafter, specific embodiments will be described based on the above description.

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

=인 경우) Example 1-1 (

=)

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. The case where the number of transmission beams is equal to the number of reception beams in the base station can be considered based on the above description. In other words,

Can be considered. For example, referring to FIG. 5, multi-beam directions for both transmit beams and receive beams may be considered in the base station side for carrier frequencies less than 6 GHz. For example, in FIG. 5, it is assumed that the number of transmission beams and the number of reception beams are all eight. However, this is merely one example, but the present invention is not limited thereto. At this time, the base station can broadcast the SS burst set to the UEs before the UE transmits the message 1 in the random access procedure. In one example, the SSB burst set that is broadcast may include each base station transmission beam that transmits SSBs based on eight SSBs and a different SSB index. At this time, with respect to the SSB transmissions, the base station can continuously transmit the eight SSBs through the transmission beam switching in the time domain. In this case, for example, referring to FIG. 5, the terminal A 510 may first receive " S0 ". In addition, terminal B 520 may receive " S1 " later on the basis of beam switching. That is, the beam can be received considering the coverage of different beams.

In this case, for 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. At this time, the UE can implicitly inform the base station of the proper downlink transmission beam direction using the RACH resource through the above-described mapping. That is, when the UE receives the " S0 ", the UE can transmit the message 1 through the RACH resource allocated for the " S0 " in the random access procedure. Thus, the BS can detect the preamble of the UE and confirm the RACH resource used for transmission of the message 1. Accordingly, the BS can confirm that the UE is in the coverage of Tx / Rx Beam 1. That is, when the number of transmission beams is equal to the number of reception beams, the terminal performs transmission of the message 1 based on the received transmission beam, and the base station can confirm the position of the terminal.

In this case, for example, if the directions of the transmission beams and the reception beams of the base station do not coincide with each other as shown in FIG. 5, the terminal may not report an appropriate transmission beam based on the mapping of FIG. At this time, in consideration of the above case, reporting can be performed based on the following method.

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

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

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

Embodiment 1-1-2 (Alternative 2, different preamble sequences are used for different SSBs)

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

For example, referring to FIG. 10, when SSB and RACH resource mappings are considered, a plurality of RACH resources in the time domain can be consecutively allocated to one SSB. At this time, as an example, the terminal A 510 of FIG. 5 can transmit the message 1 through the two RACH resources for "S0" in FIG. In addition, the terminal B 520 in FIG. 5 can transmit the message 1 through the two RACH resources for " S1 ". At this time, the base station can sweep the reception beam at the beam sweep timing shown in FIG. At this time, the preamble of the terminal A 510 and the preamble of the terminal B 520 may be generated through sequences of different sequence groups. Therefore, the base station can detect the message 1 of the terminal A 510 and the message 1 of the terminal B 520 through the Rx beam 2. [ Thus, the base station can recognize the appropriate downlink beam for each terminal.

In another example, a plurality of RACH resources may be associated with the same SSB based on different implementations for each base station. At this time, a plurality of RACH resources may be allocated in a distributed manner in the time domain. As an example, the consecutive RACH resources are as described above. On the other hand, the alternatives 1 and 2 described above can be applied to the distributed RACH resources, and the present invention is not limited to the above-described embodiments.

In this case, for example, in the case of the alternative 1 and the alternative 2 described above, the alternative case 1 can be used by allocating twice as many RACH resources in the time domain. For example, in the case of Alternative 1, a delay in the random access procedure may occur based on the above-described alternative to Alternative 2. On the other hand, alternative 2 can save RACH resources in the time domain. However, all available preamble sequences must be grouped and assigned to different SSBs, and one RACH resource may be used in two SSBs, which can have a greater impact than alternative 1 in interference. At this time, the power consumption of the terminal in terms of the terminal may be smaller than that of the alternative 2 in the terminal. That is, in the case of the alternative 2, since different interference levels must be considered for each RACH resource, the power consumption may be larger in terms of the terminal. Therefore, the above-described Alternative 1 and Alternative 2 methods can be set in consideration of the situation of the terminal and the base station, and the present invention is not limited to the above-described embodiment. In addition, the information on Alternatives 1 and 2 described above can be shared by the UE through at least one of system information, upper layer information, and L1 / L2, and is not limited to the above-described embodiments.

인 경우) Examples 1-2 (

)

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 where the number of transmission beams is greater than the number of reception beams from the viewpoint of a base station can be considered. In other words,

Can be considered. At this time, the SSB and RACH resource mapping may be as shown in FIG. For example, in the case where the same preamble sequence is used for different SSBs as the above-described alternative 1, resource mapping as shown in FIG. 11 can be used. Thus, two adjacent RACH resources are allocated for Tx beam 1 and Tx beam M, and one RACH resource may be allocated for other non-boundary Tx beams.

Also, for example, when different preamble sequences are used for different SSBs as alternative 2 described above, resource mapping as shown in FIG. 12 can be used. At this time, Tx beam 1 and Tx beam M as boundary transmission beams can be allocated to two adjacent RACH resources to solve Tx-Rx beam mismatching problem.

In this case, for example, the message 1 for each UE in the RACH setup for the UEs may be allocated to the RACH resources. For example, if message 1 is allocated to each of the RACH resources as shown in FIG. 11, the number of bits for RACH setting may increase. In this case, in the NR system, the RACH setting information may be included in the RMSI (Remaining Minimum System Information), and the RMSIs for the transmission beams of all base stations may be the same. Therefore, when all the resource mapping information is included in the RMSI considering the case of FIG. 11, burden may be increased in the RMSI. That is, since the boundary beam and the non-boundary beam occupy different RACH resources, the start position of the RACH resource for each SSB is set through the RMSI, and the length of the RACH resource for each SSB is indicated There is a need to do. Therefore, the information to be included in the RMSI can be increased.

At this time, for example, in order to reduce the burden of the RACH setting, Fig. 11 can be changed as shown in Fig. More specifically, in FIG. 13, all SSBs can be allocated to two RACH resources, regardless of whether they are boundary beams or non-boundary beams. Comparing FIG. 13 with FIG. 11, the random access procedure is delayed, and the power consumption may increase when the UE transmits the message 1. However, the Burden of the RACH setting can be reduced as described above.

인 경우) Examples 1-3 (

)

As another example, a case where the number of transmission beams is smaller than the number of reception beams in view of a base station as shown in FIG. 7 can be considered. In this case, SSB and RACH resource mapping may be as shown in FIG. 14 in consideration of Alternative 1 described above. 7, the boundary receive beam may be an Rx beam 1 and an Rx beam M, for example. At this time, for example, the Rx beam sweep timing of the boundary receiving beam may be different from other non-boundary beams. It is necessary to consider two transmission beams crossing the boundary receiving beam of the base station, so there is a need to monitor two RACH resources.

In addition, for example, FIG. 15 may be SSB and RACH resource mapping considering the case of Alternative 2 described above. At this time, the base station can make the reception beam sweep timing the same. While the RACH resources monitored by the boundary receive beam may be allocated to two adjacent transmission beams.

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

From the viewpoint of the network, if it is less than 6 GHz as in the first embodiment, the base station can provide the parameters of Table 1 below to the UE by including it in the RMSI. That is, it is possible to provide necessary information to the terminal in consideration of Embodiments 1-1 to 1-3.

[Table 1]

Example 2 (SSB and RACH resource associations and associated RACH setup content for carrier frequencies above 6 GHz)

Considering the case of exceeding 6 GHz, the frequency domain duplexing of RACH resources may be considered for designing SSB and RACH resource mappings. This is because a greater number of beams can be considered in terms of the base station. In the following, Alternative 1 will be described as a mapping method considering the case of exceeding 6 GHz, and Alternative 1 may be considered in the conditions of Table 2 below.

[Table 2]

Also, for example, Alternative 2 above 6 GHz may be equivalent to Alternative 2 of the case of less than 6 GHz in Example 1 described above. That is, the same mapping method can be applied to each FX, and is not limited to the above-described embodiment.

인 경우) Example 2-1 (

)

Considering the above alternative 1, different RACH resources may be used for the transmission beams of different base stations. For example, the number of SSBs transmitted in total in FIG. 16 may be considered as 24. However, this is merely one example, and is not limited to the above-described embodiment. At this time, FIG. 16 shows SSB and RACH resource mappings for the case described above. For example, in case of Alternative 1, two PRBs may be allocated and mapped in the frequency domain in order to solve the Tx-Rx beam mismatching problem. As an example, referring to FIG. 16, two RACH resources for two "S0" s may be mapped to "F0". Also, two RACH resources for " S1 " may be mapped to " F1 ". At this time, the RACH resources for " S0 " and " S1 " in the time domain may overlap in the second RACH resource. At this time, the remaining SSBs mapping method may be used for the same RACH resource mapping method.

At this time, a cyclic prefix can be considered to preserve 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". In this case, it can be considered that the base station includes three TRPs (Transmit / Receive Points) in the spatial domain, and each TRP includes 8 transmission beams. However, this is merely one example, and is not limited to the above-described embodiment. At this time, for example, Tx beam 1 and Tx beam 8 may be adjacent to each other at TRP 1. In addition, 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. Thus, as shown in FIG. 17, "S7" can be mapped to "L1", "S15" to "L2", and "S23" to "L3". On the other hand, considering that the base station includes only one TRP in the spatial domain, and the beam is 24, the Tx beam 24 and the Tx beam 1 can be adjacent. 18, "S7" may be mapped to "L2", "S15" may be mapped to "L3", and "S23" may be mapped to "L1".

In addition, for example, FIG. 19 is a case in which 64 SSBs are transmitted, and can represent all SSB and RACH resource association. At this time, similarly to the above, "S21", "S43" and "S63" can be mapped to the RACH resources "L1", "L2" and "L3" through the cyclic prefix.

인 경우) Example 2-2 (

)

In addition, for example, a case where the number of transmission beams is smaller than the number of reception beams is considered as shown in FIG. At this time, for example, a concrete mapping method based on the above-described alternative 1 may be as shown in Figs. 20 and 21. Fig. Referring to FIG. 20, RACH resources for one SSB may be mapped to one PRB in the frequency domain. At this time, the above-described mapping method can reduce the power consumption of the terminal. It can also be applied to the previous mapping method. However, based on FIG. 20, there may be RACH resources that are emptied. Therefore, in FIG. 21, RACH resources for one SSB can be mapped to two PRBs in the frequency domain. This further consumes the terminal power but ensures frequency diversity.

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

From the viewpoint of the network, if it is less than 6 GHz as in the first embodiment, the base station can provide the parameters of Table 1 below to the UE by including it in the RMSI. That is, it is possible to provide necessary information to the terminal in consideration of 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 BS can determine the information included in the RACH setting information in consideration of the SSB and RACH resource correspondence relationship (S2210). Referring to FIG. 1 to FIG. 21, May be set differently in case of less than 6 GHz and in case of more than 6 GHz. In addition, for example, the preamble corresponding to SSB may be set identically in SSBs, or may be set differently in each SSB. At this time, it is possible to consider the above-described relationship in correspondence between SSB and RACH resources. In addition, SSB and RACH resource correspondence can be set differently based on the number of transmission beams and the number of reception beams from the viewpoint of a base station, as described above. For example, the RACH setting information can be determined in consideration of the correspondence relationship between the SSB and the RACH resource.

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

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

23 is a block diagram of the 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. At this time, the device 2300 can communicate with the external device through the transmitter 2310 and the receiver 2320. [ In this case, for 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 side link transmission can be performed, and the present invention is not limited to the above-described embodiments.

In addition, the above-described terminal device of the present invention is not limited to a smart phone as a mobile terminal. As an example, the terminal device may be any of drones, vehicles, IoT devices, and other devices. That is, it is an apparatus that can perform communication and can be applied to the above-described invention, and is not limited to the above-described embodiment.

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

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The foregoing description of the preferred embodiments of the present invention has been presented for those skilled in the art to make and use the invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that 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. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention.

In this specification, both the invention and the method invention are explained, and the description of both inventions can be supplemented as necessary.

The present invention has been described with reference to preferred embodiments thereof. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof 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,
Receiving RACH (Random Access Channel) configuration information from a base station;
And transmitting a first message based on the received RACH configuration information to the base station,
Each of a plurality of synchronization signal blocks (SSB) corresponds to a plurality of preambles,
Wherein the first message is transmitted over a plurality of RACH resources in the time domain.
The method according to claim 1,
The plurality of preambles corresponding to the plurality of SSBs are all the same preamble,
Wherein each of the plurality of SSBs is distinguished based on a location of each of a plurality of RACH resources.
3. The method of claim 2,
Wherein the first message corresponding to one SSB is transmitted on two consecutive RACH resources when the number of Tx beams of the base station is equal to the number of Rx beams.
3. The method of claim 2,
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 in two consecutive RACH resources, and the non-boundary transmission Wherein the first message of the SSB corresponding to the beam is transmitted on one RACH resource.
3. The method of claim 2,
Wherein 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 receiving beam and the non-boundary receiving beam sweeping timing are set differently.
The method according to claim 1,
Each of the plurality of SSBs corresponding to a different preamble,
Wherein each of the plurality of SSBs is distinguished based on preambles.
The method according to claim 6,
Wherein the first message including a plurality of preambles corresponding to a plurality of SSBs is transmitted in one RACH resource when the number of transmission beams (Tx beams) of the base station is equal to the number of reception beams (Rx beams) How to perform the access procedure.
The method according to claim 6,
When the number of transmission beams (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,
Wherein 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, Way.
The method according to 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, How to perform the access procedure.
The method according to claim 1,
Wherein the random access procedure is applied at less than 6 GHz.
A method for a base station performing a random access procedure in a wireless communication system,
Determining information included in RACH configuration information in consideration of a synchronization signal block (SSB) and a RACH (Random Access Channel) resource correspondence relationship;
Transmitting the RACH setting information to a terminal; And
And receiving a first message based on the RACH configuration information from the terminal,
Each of the plurality of SSBs corresponds to a plurality of preambles,
Wherein the first message is received over a plurality of RACH resources in the time domain.
12. The method of claim 11,
The plurality of preambles corresponding to the plurality of SSBs are all the same preamble,
Wherein each of the plurality of SSBs is distinguished based on a location of each of a plurality of RACH resources.
13. The method of claim 12,
Wherein the first message corresponding to one SSB is transmitted on two consecutive RACH resources when the number of Tx beams of the base station is equal to the number of Rx beams.
13. The method of claim 12,
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 in two consecutive RACH resources, and the non-boundary transmission Wherein the first message of the SSB corresponding to the beam is transmitted on one RACH resource.
13. The method of claim 12,
Wherein 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 receiving beam and the non-boundary receiving beam sweeping timing are set differently.
12. The method of claim 11,
Each of the plurality of SSBs corresponding to a different preamble,
Wherein each of the plurality of SSBs is distinguished based on preambles.
17. The method of claim 16,
Wherein the first message including a plurality of preambles corresponding to a plurality of SSBs is transmitted in one RACH resource when the number of transmission beams (Tx beams) of the base station is equal to the number of reception beams (Rx beams) How to perform the access procedure.
17. The method of claim 16,
When the number of transmission beams (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,
Wherein 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, Way.
A terminal for performing a random access procedure in a wireless communication system,
A transmitting unit;
A receiving unit; And
And a processor for controlling the transmitter and the receiver,
The processor comprising:
Receives RACH (Random Access Channel) configuration information from the base station through the receiver,
Transmitting a first message based on the received RACH configuration information to the base station,
Each of a plurality of synchronization signal blocks (SSB) corresponds to a plurality of preambles,
Wherein the first message is transmitted through a plurality of RACH resources in the time domain.
A base station for performing a random access procedure in a wireless communication system,
A transmitting unit;
A receiving unit; And
And a processor for controlling the transmitter and the receiver,
The processor comprising:
Information included in the RACH configuration information is determined in consideration of a synchronization signal block (SSB) and a RACH (Random Access Channel) resource correspondence relationship,
Transmits the RACH configuration information to the terminal through the transmitter, and
Receiving a first message based on RACH configuration information received from the terminal through the receiver,
Each of the plurality of SSBs corresponds to a plurality of preambles,
Wherein the first message is received over a plurality of RACH resources in a time domain.

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