WO2019083278A1 - Method and device for performing random access procedure in wireless communication system - Google Patents

Abstract

Provided are a method and device for transmitting MSG3 in a random access procedure in a wireless communication system. A user equipment (UE) determines a frequency resource for transmitting MSG3 in a random access procedure and transmits the MSG3 to a network via the frequency resource. The starting position of the frequency resource is the smallest physical resource block (PRB) of an active uplink (UL) bandwidth part (BWP), and the bandwidth of the frequency resource is the same as the bandwidth of an initial UL BWP.

Description

Method and apparatus for performing a random access procedure in a wireless communication system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wireless communication, and more particularly, to a method and apparatus for performing a random access procedure in a wireless communication system, especially a new radio access technology (NR).

3GPP (third generation partnership project) Long-term evolution (LTE) is a technology for enabling high-speed packet communication. Many approaches have been proposed to reduce costs for LTE target users and service providers, improve service quality, expand coverage, and increase system capacity. 3GPP LTE requires cost savings per bit, improved serviceability, flexible use of frequency bands, simple structure, open interface and adequate power consumption of the terminal as a high level requirement.

Work has started to develop requirements and specifications for the new radio access technology (NR) systems in the international telecommunication union (ITU) and 3GPP. The NR system can be called by another name, such as new RAT. 3GPP identifies the technology components needed to successfully standardize NRs to meet both urgent market demands and the longer-term requirements of the ITU radio communication sector (IMT) -2020 process. And development. NR should also be able to use any spectrum band of at least 100 GHz that can be used for wireless communications in the distant future.

NR targets a single technology framework covering all deployment scenarios, usage scenarios, and requirements, including enhanced mobile broadband (eMBB), massive machine-type-communications (mMTC), ultra-reliable and low latency communications . NR should be forward-compatible in nature.

The initial connection of the NR is intended to acquire the initial synchronization and system information of the downlink and to connect the radio resource control (RRC) through the random access procedure. This is basically the same as the purpose of the initial access technology of 3GPP LTE / LTE-A Do. In addition, NR includes various element technologies from the initial access stage to support multi-beam transmission and broadband.

Due to the inherent nature of NR, the initial access procedure of NR may be different from the initial access procedure in conventional 3GPP LTE / LTE-A. The present invention discusses a method for allocating frequency resources for transmission of MSG3 in a random access procedure.

In an aspect, a method is provided in which a user equipment (UE) in a wireless communication system transmits MSG3 in a random access procedure. The method includes determining a frequency resource for transmission of the MSG3 in the random access procedure, and transmitting the MSG3 to the network via the frequency resource. The starting position of the frequency resource is the smallest physical resource block (PRB) of an active uplink (UL) bandwidth part (BWP), and the bandwidth of the frequency resource is the same as the bandwidth of the initial UL BWP.

In another aspect, a user equipment (UE) is provided in a wireless communication system. The UE includes a memory, a transceiver, and a processor coupled to the memory and the transceiver. The processor controls the transceiver to determine a frequency resource for transmission of the MSG3 in the random access procedure and to transmit the MSG3 to the network via the frequency resource. The starting position of the frequency resource is the smallest physical resource block (PRB) of an active uplink (UL) bandwidth part (BWP), and the bandwidth of the frequency resource is the same as the bandwidth of the initial UL BWP.

In another aspect, a method is provided for a base station (BS) in a wireless communication system to receive MSG3 in a random access procedure. The method includes receiving a random access preamble from a user equipment (UE), transmitting a random access response to the UE in response to the random access preamble, and transmitting the MSG3 to a UE via a frequency resource for transmission of the MSG3. Lt; / RTI > The starting position of the frequency resource is the smallest physical resource block (PRB) of an active uplink (UL) bandwidth part (BWP), and the bandwidth of the frequency resource is the same as the bandwidth of the initial UL BWP.

The frequency resources for the transmission of the MSG3 in the random access procedure can be effectively allocated.

FIG. 1 shows an example of a wireless communication system to which the technical features of the present invention can be applied.

2 shows another example of a wireless communication system to which the technical features of the present invention can be applied.

FIG. 3 shows an example of a frame structure to which the technical features of the present invention can be applied.

Fig. 4 shows another example of a frame structure to which the technical features of the present invention can be applied.

FIG. 5 shows an example of a resource grid to which the technical features of the present invention can be applied.

6 shows an example of a synchronization channel to which the technical features of the present invention can be applied.

FIG. 7 shows an example of a frequency allocation scheme to which the technical features of the present invention can be applied.

Figure 8 shows an example of multiple BWPs to which the technical features of the present invention may be applied.

9 shows an example of a minislot configuration according to an embodiment of the present invention.

10 illustrates an example of a PUCCH resource according to an embodiment of the present invention.

11 illustrates an example of a different virtual resource set for different minislots and the like according to an embodiment of the present invention.

12 shows an example of a plurality of virtual resource sets according to an embodiment of the present invention.

13 illustrates a method by which a UE transmits MSG3 in a random access procedure according to an embodiment of the present invention.

14 shows a UE in which an embodiment of the present invention is implemented.

15 illustrates a method by which a BS and a UE perform a random access procedure according to an embodiment of the present invention.

16 shows a BS in which an embodiment of the present invention is implemented.

The technical features described below can be used in a communication standard by a 3rd Generation Partnership Project (3GPP) standardization organization or a communication standard by an IEEE (institute of electrical and electronics engineers) standardization organization. For example, the communication specification by the 3GPP standardization organization includes the evolution of long term evolution (LTE) and / or LTE systems. The evolution of LTE systems includes LTE-A (advanced), LTE-A Pro, and / or 5G NR (new radio). The communication standard by the IEEE standardization organization includes a wireless local area network (WLAN) system such as IEEE 802.11a / b / g / n / ac / ax. The system described above may be used to transmit various multiple access technologies such as orthogonal frequency division multiple access (OFDMA) and / or single carrier frequency division multiple access (SC-FDMA) to a downlink (DL) and / or uplink ). For example, only OFDMA may be used for DL and only SC-FDMA may be used for UL. Or, OFDMA and SC-FDMA may be mixed in DL and / or UL.

FIG. 1 shows an example of a wireless communication system to which the technical features of the present invention can be applied. Specifically, FIG. 1 is a system architecture based on an evolved-universal terrestrial radio access network (E-UTRAN). The above-mentioned LTE is part of E-UMTS (evolved-UMTS) using E-UTRAN.

Referring to FIG. 1, a wireless communication system includes at least one user equipment (UE) 10, an E-UTRAN, and an evolved packet core (EPC). UE 10 refers to a communication device carried by a user. The UE 10 may be fixed or mobile and may be referred to by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device,

The E-UTRAN is composed of one or more base stations (BSs) 20. The BS 20 provides an end of the E-UTRA user plane and control plane protocol towards the UE 10. The BS 20 generally refers to a fixed station in communication with the UE 10. The BS 20 performs functions such as radio resource management (RRM), radio bearer (RB) control, access control, wireless admission control, measurement configuration / provision, and dynamic resource allocation (scheduler) Host. The BS 20 may be referred to by other terms such as an evolved NodeB (eNB), a base transceiver system (BTS), an access point, and the like.

A downlink (DL) indicates communication from the BS 20 to the UE 10. The uplink (UL) indicates the communication from the UE 10 to the BS 20. The sidelink (SL) indicates the communication between the UEs 10. In the DL, the transmitter may be part of the BS 20, and the receiver may be part of the UE 10. In the UL, the transmitter may be part of the UE 10, and the receiver may be part of the BS 20. In the SL, the transmitter and the receiver may be part of the UE 10.

The EPC includes a mobility management entity (MME), a serving gateway (S-GW), and a packet data network (PDN) gateway. The MME hosts functions such as non-access stratum (NAS) security, idle state mobility processing, and evolved packet system (EPS) bearer control. The S-GW hosts functions such as mobility anchoring and the like. The S-GW is a gateway having the E-UTRAN as an end point. For convenience, the MME / S-GW 30 will be referred to simply as a " gateway ", but this entity is understood to include both the MME and the S-GW. The P-GW hosts UE IP (Internet protocol) address assignment, packet filtering, and the like. The P-GW is a gateway having the PDN as an end point. The P-GW is connected to the external network.

The UE 10 is connected to the BS 20 by a Uu interface. The UEs 10 are interconnected by a PC5 interface. The BSs 20 are interconnected by an X2 interface. The BS 20 is also connected to the EPC via the S1 interface. More specifically, it is connected to the MME by the S1-MME interface and by the S1-U interface to the S-GW. The S1 interface supports a many-to-many relationship between the MME / S-GW and the BS.

2 shows another example of a wireless communication system to which the technical features of the present invention can be applied. Specifically, Figure 2 illustrates a system architecture based on a 5G NR (new radio access technology) system. An entity used in a 5G NR system (hereinafter simply referred to as "NR") may absorb some or all of the functions of the entity (eg, eNB, MME, S-GW) introduced in FIG. An entity used in an NR system may be identified with the name " NG " to distinguish it from LTE.

Referring to FIG. 2, the wireless communication system includes one or more UEs 11, a next-generation RAN (NG-RAN) and a fifth-generation core network 5GC. The NG-RAN consists of at least one NG-RAN node. The NG-RAN node is an entity corresponding to the BS 20 shown in Fig. The NG-RAN node consists of at least one gNB 21 and / or at least one ng-eNB 22. The gNB 21 provides an end of the NR user plane and control plane protocol towards the UE 11. The Ng-eNB 22 provides an end of the E-UTRA user plane and control plane protocol towards the UE 11.

5GC includes an access and mobility management function (AMF), a user plane function (UPF), and a session management function (SMF). AMF hosts features such as NAS security, idle state mobility handling, and so on. AMF is an entity that includes the functions of the conventional MME. The UPF hosts features such as mobility anchoring and protocol data unit (PDU) processing. The UPF is an entity including the functions of the conventional S-GW. The SMF hosts features such as UE IP address assignment and PDU session control.

gNB and ng-eNB are interconnected via the Xn interface. The gNB and ng-eNB are also connected to the 5GC via the NG interface. More specifically, it is connected to the AMF via the NG-C interface and to the UPF via the NG-U interface.

The structure of the radio frame in NR is described. In LTE / LTE-A, one radio frame is composed of 10 subframes, and one subframe is composed of 2 slots. The length of one subframe may be 1 ms, and the length of one slot may be 0.5 ms. The transmission time (generally, over one subframe) of a transmission block from an upper layer to a physical layer is defined as a transmission time interval (TTI). The TTI may be a minimum unit of scheduling.

Unlike LTE / LTE-A, NR supports a variety of new images, so the structure of the radio frame can vary. NR supports multiple subcarrier intervals in the frequency domain. Table 1 shows the various neural logarithms supported by NR. Each new locale can be identified by an index μ.

μ	Subcarrier spacing (kHz)	CP	Is it supported for data?	Is it supported for synchronization?
0	15	Normal CP	Yes	Yes
One	30	Normal CP	Yes	Yes
2	60	General / Expanded CP	Yes		No
3	120	Normal CP	Yes		Yes
4	240	Normal CP	No	Yes

Referring to Table 1, the subcarrier spacing may be set to one of 15, 30, 60, 120 and 240 kHz identified by the index μ. However, the subcarrier spacing shown in Table 1 is only exemplary, and the specific subcarrier spacing can be changed. Therefore, each subcarrier interval (e.g., mu = 0, 1 ... 4) can be expressed by a first subcarrier interval, a second subcarrier interval, ... Nth subcarrier interval. Transmission of user data (for example, physical uplink shared channel (PUSCH), physical downlink shared channel (PDSCH)) may not be supported depending on the subcarrier interval. That is, the transmission of user data may not be supported at at least one specific subcarrier interval (e.g., 240 kHz).

In addition, referring to Table 1, a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcasting channel (PBCH) may not be supported according to a subcarrier interval. It may not be supported at a specific subcarrier interval (for example, 60 kHz).

In NR, the number of slots and the number of slots included in one radio frame / subframe may differ depending on various new logics, that is, various subcarrier intervals. Table 2 shows examples of the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in a general CP (cyclic prefix).

μ	Number of OFDM symbols per slot	Number of slots per radio frame	Number of slots per subframe
0	14	10	One
One	14	20	2
2	14	40	4
3	14	80	8
4	14	160	16

Referring to Table 2, when a first newsletter corresponding to μ = 0 is applied, one radio frame includes 10 subframes, one subframe corresponds to one slot, one slot It consists of 14 symbols. In this specification, symbols represent signals that are transmitted during a particular time interval. For example, the symbol may represent a signal generated by OFDM processing. That is, the symbol may refer to an OFDM / OFDMA symbol or an SC-FDMA symbol or the like. The CP may be located between each symbol. FIG. 3 shows an example of a frame structure to which the technical features of the present invention can be applied. In Fig. 3, the subcarrier spacing is 15 kHz, which corresponds to mu = 0.

Fig. 4 shows another example of a frame structure to which the technical features of the present invention can be applied. In Fig. 4, the subcarrier interval is 30 kHz, which corresponds to mu = 1.

Meanwhile, a frequency division duplex (FDD) and / or a time division duplex (TDD) may be applied to a wireless communication system to which the embodiment of the present invention is applied. When TDD is applied, in LTE / LTE-A, UL subframe and DL subframe are allocated on a subframe basis.

In NR, symbols in a slot can be classified into a DL symbol (denoted as D), a floating symbol (denoted X), and a UL symbol (denoted U). In a slot of a DL frame, the UE assumes that the DL transmission occurs only on the DL symbol or the floating symbol. In a slot of an UL frame, the UE must transmit only UL symbols or floating symbols.

Table 3 shows an example of the slot format identified by the corresponding format index. The contents of Table 3 may be applied in common to a specific cell or commonly applied to adjacent cells, or may be applied to each UE separately or differently.

format

Symbol number in slot

0

One

2

3

4

5

6

7

8

9

10

11

12

13

0

D

D

D

D

D

D

D

D

D

D

D

D

D

D

One

U

U

U

U

U

U

U

U

U

U

U

U

U

U

2

X

X

X

X

X

X

X

X

X

X

X

X

X

X

3

D

D

D

D

D

D

D

D

D

D

D

D

D

X

...

For ease of explanation, Table 3 shows only a portion of the slot format actually defined in NR. A particular assignment scheme may be changed or added. The UE may receive the slot format configuration via higher layer signaling (i. E., Radio resource control (RRC) signaling). Alternatively, the UE may receive the slot format configuration via downlink control information (DCI) received on the PDCCH. Alternatively, the UE may receive the slot format configuration through a combination of higher layer signaling and DCI.

FIG. 5 shows an example of a resource grid to which the technical features of the present invention can be applied. The example shown in Figure 5 is a time-frequency resource grid used in NR. The example shown in Fig. 5 can be applied to UL and / or DL. Referring to FIG. 5, a plurality of slots are included in one subframe in the time domain. Specifically, when expressed according to the value of " [mu] ", " 14 * 2 [mu] " symbols can be represented in the resource grid. In addition, one resource block (RB) may occupy 12 consecutive subcarriers. One RB may be called a physical resource block (PRB), and 12 resource elements (REs) may be included in each PRB. The number of assignable RBs may be determined based on the minimum and maximum values. The number of allocatable RBs can be individually configured according to the new logistics (" "). The number of assignable RBs may be configured with the same value for UL and DL, or may be configured with different values for UL and DL.

A cell search method in NR is described. The UE may perform cell search to obtain time and / or frequency synchronization with the cell and obtain a cell ID. Synchronization channels such as PSS, SSS and PBCH may be used for cell search.

6 shows an example of a synchronization channel to which the technical features of the present invention can be applied. Referring to FIG. 6, the PSS and the SSS may include one symbol and 127 subcarriers. The PBCH may include 3 symbols and 240 subcarriers.

The PSS is used to acquire the SS / PBCH block (synchronization signal / PBCH block) symbol timing. The PSS indicates three hypotheses for cell ID identification. The SSS is used for cell ID identification. SSS indicates 336 hypotheses. As a result, 1008 physical layer cell IDs can be configured by the PSS and the SSS.

The SS / PBCH block may be repeatedly transmitted according to a predetermined pattern in a 5 ms window. For example, when L SS / PBCH blocks are transmitted, both SS / PBCH block # 1 to SS / PBCH block #L may contain the same information, but may be transmitted via beams in different directions. That is, a quasi co-located (QCL) relationship may not be applied to the SS / PBCH block in the 5 ms window. The beam used to receive the SS / PBCH block may be used for subsequent operation (e.g., random access operation) between the UE and the network. The SS / PBCH block may be repeated for a certain period of time. The repetition period can be individually configured according to the neurological background.

Referring to FIG. 6, the PBCH has 20 RBs for the second symbol / fourth symbol and 8 RBs for the third symbol. The PBCH includes a demodulation reference signal (DM-RS) for decoding the PBCH. The frequency domain for the DM-RS is determined by the cell ID. Unlike LTE / LTE-A, a special DM-RS (i. E., PBCH-DMRS) is defined for decoding PBCH, since cell-specific reference signal (CRS) is not defined in NR. In PBCH-DMRS, the SS / PBCH block may include information indicating an index.

The PBCH performs various functions. For example, the PBCH can perform a function of broadcasting a master information block (MIB). System information (SI) is divided into minimum SI (SI) and other SI (SI). The minimum SI can be divided into MIB and SIB1 (system information block type-). The minimum SI, excluding the MIB, can be called the remaining minimum SI (RMSI). That is, the RMSI can refer to SIB1.

The MIB contains information necessary for decoding SIB1. For example, the MIB may include information on sub-carrier intervals applied to SIB1 (and MSG 2/4, other SI used in the random access procedure), information on the frequency offset between the SS / PBCH block and the subsequently transmitted RB, / SIB, information for decoding the PDCCH (e.g., information about a control resource set / a control resource set / DM-RS to be described later). The MIB may be transmitted periodically, and the same information may be transmitted repeatedly over a time interval of 80 ms. SIB1 may be repeatedly transmitted via the PDSCH. SIB1 includes control information for initial connection of the UE and information for decoding another SIB.

PDCCH decoding in NR is described. The search space for the PDCCH corresponds to the area in which the UE performs blind decoding on the PDCCH. In LTE / LTE-A, the search space for the PDCCH is divided into a common search space (CSS) and a UE-specific search space (USS). The size of each search space and / or the size of the control channel element (CCE) included in the PDCCH is determined according to the PDCCH format.

In NR, a resource element group (REG) and a CCE are defined for the PDCCH. In NR, the concept of CORESET is defined. Specifically, one REG corresponds to 12 REs, that is, one RB transmitted through one OFDM symbol. Each REG contains a DM-RS. One CCE includes a plurality of REGs (e.g., six REGs). The PDCCH can be transmitted over a resource consisting of 1, 2, 4, 8, or 16 CCEs. The number of CCEs can be determined according to the aggregation level. That is, 1 CCE is set when the set level is 1, 2 CCE is set when the set level is 2, 4 CCE is set when the set level is 4, 8 CCE is set when the set level is 8, and 16 CCE is set when the set level is set to 16 May be included in the PDCCH for the UE.

CORESET can be defined in 1/2/3 OFDM symbols and multiple RBs. In LTE / LTE-A, the number of symbols used in the PDCCH is defined by the physical control format indicator channel (PCFICH). However, PCFICH is not used in NR. Instead, the number of symbols used in CORESET may be defined by the RRC message (and / or PBCH / SIB1). In LTE / LTE-A, there is no signaling regarding the frequency bandwidth of the PDCCH because the frequency bandwidth of the PDCCH is equal to the total system bandwidth. In NR, the frequency domain of CORESET can be defined by the RRC message (and / or PBCH / SIB1) in units of RB.

The search space of PDCCH in NR is divided into CSS and USS. Since the USS may be indicated by an RRC message, an RRC connection may be required for the UE to decode the USS. The USS may include control information for PDSCH decoding assigned to the UE.

Even if the RRC configuration is not completed, the PDCCH must be decoded, so CSS must be defined. For example, the CSS may be defined when a PDCCH is configured to decode a PDSCH carrying SIBl, or when a PDCCH for receiving MSG 2/4 is configured in a random access procedure. In NR, like LTE / LTE-A, the PDCCH can be scrambled by a radio network temporary identifier (RNTI) for a specific purpose.

The resource allocation scheme in NR is described. In NR, a certain number (e.g., a maximum of four) of bandwidth parts (BWPs) can be defined. The BWP (or carrier BWP) is a set of consecutive PRBs, which can be represented as a continuous subset of common RBs (CRBs). Each RB in the CRB can be represented by CRB1, CRB2, etc. starting with CRB0.

FIG. 7 shows an example of a frequency allocation scheme to which the technical features of the present invention can be applied. Referring to FIG. 7, a plurality of BWPs may be defined in the CRB grid. The reference point of the CRB grid (which may be referred to as a common reference point, starting point, etc.) is called the so-called " point A " in NR. Point A is indicated by RMSI (i.e., SIB1). Specifically, the frequency offset between the frequency band in which the SS / PBCH block is transmitted and the point A can be indicated via the RMSI. Point A corresponds to the center frequency of CRB0. Further, the point A may be a point where a variable " k " indicating the frequency band of RE in the NR is set to zero. The plurality of BWPs shown in Fig. 7 are composed of one cell (for example, PCell (primary cell)). A plurality of BWPs may be configured individually or commonly for each cell.

Referring to FIG. 7, each BWP may be defined by its size and starting point from CRB0. For example, the first BWP, BWP # 0, may be defined by the starting point through an offset from CRB0, and the size of BWP # 0 may be determined through the size for BWP # 0.

A specific number (e.g., up to four) of BWPs may be configured for the UE. At a particular point in time, only a certain number (e.g., one) of BWPs can be activated per cell. The number of configurable BWPs or the number of activated BWPs may be configured commonly or individually for UL and DL. The UE may receive the PDSCH, PDCCH and / or CSI (channel state information) RS only in the active DL BWP. In addition, the UE may only transmit a PUSCH and / or a physical uplink control channel (PUCCH) to the active UL BWP.

Figure 8 shows an example of multiple BWPs to which the technical features of the present invention may be applied. Referring to FIG. 8, three BWPs may be constructed. The first BWP may span a 40 MHz band and a subcarrier spacing of 15 kHz may be applied. The second BWP may span the 10 MHz band and a subcarrier spacing of 15 kHz may be applied. The third BWP may span the 20 MHz band and a subcarrier spacing of 60 kHz may be applied. The UE may configure at least one of the three BWPs as an active BWP and may perform UL and / or DL data communication via the active BWP.

The time resource may be indicated in a manner that indicates a time difference / offset based on the transmission time point of the PDCCH allocating DL or UL resources. For example, the starting point of the PDSCH / PUSCH corresponding to the PDCCH and the number of symbols occupied by the PDSCH / PUSCH may be indicated.

Carrier aggregation (CA) is described. Like LTE / LTE-A, CA can be supported in NR. That is, it is possible to aggregate continuous or discontinuous component carriers (CCs) to increase the bandwidth and consequently to increase the bit rate. Each CC may correspond to a (serving) cell, and each CC / cell may be divided into a primary serving cell (PSC) / primary secondary cell (PCC) or a secondary serving cell (SSC) / secondary secondary cell (SCC).

Hereinafter, various aspects related to resource allocation in NRs proposed by the present invention will be described according to an embodiment of the present invention.

1. Allocate resources through slots and / or minislots

In NR, different time intervals, i.e., slots and / or minislots, may be supported for monitoring data and / or control signals. In slot based scheduling, single slot scheduling and / or multiple slot scheduling and / or cross slot scheduling may be supported. Similar to slot-based scheduling in minislot-based scheduling, single minislot scheduling and / or multiple minislot scheduling and / or crossmini slot scheduling (i.e., cross-OFDM symbol scheduling) may be supported. If the above scheduling is mixed, it is necessary to clarify the UE operation. In particular, it is necessary to clarify the UE operation when scheduling based on different time intervals, i.e., slot-based scheduling and minislot-based scheduling conflict with each other.

Before discussing the collision, the structure of slot-based scheduling and minislot-based scheduling is described. At least one of the following approaches may be considered.

(1) Approach 1: Common Approach

In Approach 1, slot-based scheduling and minislot-based scheduling can be performed based only on scheduling of the network. The UE may be configured with one or a plurality of slots for control channel monitoring. The UE may be scheduled for a slot or minislot in each scheduling. At this time, a certain degree of restriction may occur with respect to scheduling. For example, in terms of the location of the PDSCH, it is possible to use a completely flexible resource allocation (e.g., start symbol + interval) and / or semi-flexible resource allocation (e.g., One can be considered).

The CORESET, which is configured in the middle of the slot, can schedule data that does not leave the slot. This limitation can be applied only to single minislot scheduling and / or crossmini slot scheduling. That is, the beginning and / or last symbol of the minislot PDSCH or minislot PUSCH can not escape the slot. However, in the multiple mini slot scheduling, data can be scheduled out of slots. In this case, one of the following options may be considered.

Option 1: The location of the start and / or last symbol for a minislot within a slot may be the same across a scheduled minislot. That is, the minislot can be repeated over a plurality of slots.

Option 2: Repetition and / or scheduling occurs in consecutive minislots. In this case, the size of the minislot needs to be limited to two symbols and / or seven symbols, so that the size of the slot can be a multiple of the size of the minislot.

It is also necessary to clearly define how to handle floating symbols or UL symbols in the unpacked spectrum. For example, it can be assumed that all resources are contiguous and available so that a plurality of scheduled minislots can be constructed continuously, regardless of the paired spectrum or the unloaded spectrum. Alternatively, the minislot may be configured to exclude flow symbols and UL symbols for DL scheduling, and may also be configured to exclude flow symbols and DL symbols for UL scheduling. To this end, the slot is divided into a plurality of minislots, and a minislot comprising one or more floating symbols and / or UL symbols may be excluded from the iteration for DL scheduling.

9 shows an example of a minislot configuration according to an embodiment of the present invention. Figure 9- (a) shows the case where the start and / or last symbol positions for a minislot in a slot are the same over a scheduled minislot, according to Option 1 described above. That is, the minislot is repeated over a plurality of slots. Fig. 9- (b) shows a case in which the minislot is continuously and repeatedly configured regardless of whether or not the minislot includes the floating symbol and / or UL symbol according to Option 2 described above. At this time, all minislots are considered to be available resources. FIG. 9- (c) shows a case in which minislots are continuously and repeatedly configured according to Option 2, according to whether a minislot includes a floating symbol and / or a UL symbol. At this time, the minislot including the floating symbol and / or the UL symbol is excluded from the DL scheduling, and the remaining minislots are configured to be continuously repeated.

One or more DCIs may be scheduled in the search space (CSS and / or USS) based on the RNTI and / or DCI format in CORESET. However, the amount of data the UE can handle depends on the UE capability. The following options may be considered with the mandatory capabilities of the UE:

Mandatory, the UE may process at most one PDSCH and one PUSCH in a slot for a given neighboring.

Mandatory, the UE may process at most one unicast PDSCH, one broadcast PDSCH and one PUSCH in a slot for a given broadcast.

Mandatory, the UE can process at most two PDSCHs and one PUSCH in one slot.

Mandatory, the UE shall process both the total TBS (transport block size) that the UE can support in a given time unit or the maximum TBS and / or PDSCH corresponding to the maximum number of blind decodings that the UE can support in a given time unit . The time unit may be one symbol and / or a few symbols and / or a slot. That is, if the UE capability for the peak data rate is not exceeded, the UE should be able to process DL data and / or UL data at any given time unit. If the peak data rate differs from process time to process time, if the data with different process times are multiplexed, the peak data rate corresponding to the fastest process time can be regarded as UE capability. This is so as not to increase processing delay. Alternatively, the network may configure processing time for the UE, and the UE may report to the network a peak data rate and / or maximum TBS that it can support at a given processing time. For example, if the UE supports both slow processing times and fast processing times, and each processing time is different in each of the new routines, the network selects which processing time and which of the new routines to use as a reference, . The UE may then report to the network the UE capabilities such as the peak data rate and / or the maximum TBS based on the reference processing time and / or the reference local location.

In addition, the UE may report additional UE capabilities to support more data / control signals. If the network schedules more PDSCHs and / or PUSCHs than the UE supports, the transmission of one or more data channels based on priority may be omitted.

A plurality of time intervals and PUCCH resources may be configured. The following options may be considered to support PUCCH resources.

An index of the PUCCH resource set and an index of the PUCCH resource within the selected PUCCH resource set can be indicated through the PUCCH resource indication of the DCI. There may be a plurality of sets of PUCCH resources having different starting points and / or time intervals. For example, if a PUCCH occupying two symbols is supported, there may be seven PUCCH resources in a slot. With respect to repetition of the PUCCH resource, the number of iterations can be indicated via semi-static configuration signaling and / or dynamic signaling. The index of the PUCCH resource set and / or the index of the PUCCH resource within the selected PUCCH resource set may be included in the time domain indication in the DCI.

- The PUCCH resource set can be configured semi-statically. In a semi-statically configured PUCCH resource set, one PUCCH resource may be selected based on an explicit indication of the timing between the PDSCH and the PUCCH. Alternatively, in a semi-statically configured PUCCH resource set, one PUCCH resource may be selected based on an implicit indication of the timing between the PDSCH and the PUCCH. The selected PUCCH resource may be comprised of a start symbol and / or a time interval.

- a set of time resources on a slot-by-slot basis can be configured or predetermined, and one of these resources can be selected dynamically and / or semi-statically. In the selected resource, the start symbol (or start slot or start minislot) and / or time interval may be dynamically selected.

A set of virtual time resources (hereinafter referred to as virtual resources) for PUCCH can be configured, and only a limited set of virtual resources can be designated according to time domain indications (e.g., timing between PDSCH and PUCCH) . In constructing virtual resources, the same set of virtual resources may be configured in each slot, and the same pattern and / or set may be repeated over a plurality of slots. One or more virtual resources that overlap with unavailable PUCCH resources may be ignored in order to resolve UL resources that are not available due to SRS (sounding reference signal) resources and / or TDD or reserved resources. Alternatively, in constructing a virtual resource, a set of different virtual resources in each slot may be configured according to SRS configuration and / or DL / UL configuration and / or reservation resource configuration and so on. There can be a plurality of sets of patterns, and one pattern can be selected for each slot.

10 illustrates an example of a PUCCH resource according to an embodiment of the present invention. Referring to FIG. 10, a set of PUCCH time resources limited by each PDSCH is indicated. Invalid virtual resources due to reserved resource configuration and / or DL / UL configuration are excluded in dynamically indicating PUCCH resources. When four PUCCH resources are indicated, four valid PUCCH resources are indicated via DCI.

The effective resources for the PUCCH may include only UL-configured UL resources, or consider semi-statically configured UL resources and flow resources, or semi-statically configured UL resources and group common SFI (slot format indicators) Lt; RTI ID = 0.0 > UL < / RTI > Whether a resource is included in the virtual PUCCH resource may also be configured and / or dictated by the network.

There can be a set of multiple virtual resources. For example, the maximum time interval of each set of virtual resources may be different for two symbols, four symbols, seven symbols, and / or 14 symbols. Which virtual resource set is used for each PDSCH can be determined by any of the following.

For each CORESET and / or search space and / or DCI format, which set of virtual resources is used for PUCCH resource selection can be configured semi-statically.

- Which virtual resource set is used for PUCCH resource selection can be dynamically selected by the DCI.

Among the plurality of sets of virtual resources including the maximum time interval and / or the start symbol, the UE can be configured with a limited number of sets of virtual resources per slot and / or K slots, and one or more virtual resources Can be selected dynamically.

(2) Approach 2: Fixed slot and minislot structure

The approach 1 described above can be used when the UE is scheduled for a limited number of data channels in a given slot or when the UE supports a single use case. On the other hand, Approach 2 may be used when the UE supports multiple use cases. Alternatively, the network may configure either Approach 1 or Approach 2 via cell specific signaling and / or UE specific common signaling and / or UE specific signaling.

(3) Approach 3: Virtual resource-based approach

A hybrid approach of approach 1 and approach 2 may be considered. That is, resource allocation can indicate which virtual resource set is used through semi-static signaling and / or dynamic signaling.

11 illustrates an example of a different virtual resource set for different minislots and the like according to an embodiment of the present invention. 11- (a) shows an example of a virtual resource set when the length of the minislot is two symbols. 11 (b) shows an example of a virtual resource set when the length of the minislot is 4 symbols. FIG. 11- (c) shows an example of a virtual resource set when the length of the minislot is 7 symbols. 11- (d) shows an example of a virtual resource set when the length of a minislot is two symbols. A virtual resource set may be configured on a semi-static DL / UL resource for each of DL and UL. Whether to construct a virtual resource set including a flow resource can be configured by the network.

Further, even when the minislot includes the same number of symbols, a plurality of different virtual resource sets can be configured.

12 shows an example of a plurality of virtual resource sets according to an embodiment of the present invention. 12 (a), 12 (b), and 12 (c) show examples of a virtual resource set when the length of a minislot is two symbols. However, the virtual resource sets are configured differently.

One embodiment of the present invention is summarized as follows.

- A plurality of virtual resource sets can be predefined or configured for each minislot.

Minislot interval or selected virtual resource set may be semi-statically configured and / or dynamically indicated by the DCI. For a common data such as at least a broadcast channel, a fixed virtual resource set can be predefined. For example, a virtual resource set in which a virtual resource aligned with an SS / PBCH block is fixed can be predefined. The virtual resource set may be predefined based on the slot structure and / or other signals (e.g., SS / PBCH blocks). Alternatively, the virtual resource set may be defined uniformly (for example, seven virtual resources occupying two symbols in one slot) or flexibly defined (e.g., all symbols may be defined as the start symbol . ≪ / RTI > Alternatively, the virtual resource set may follow a different format (e.g., a short TTI format of LTE).

In slot-based scheduling, the virtual resource may be a slot.

- In pointing to time-domain resources, a set of virtual resources may be indicated by the DCI regardless of whether the virtual resources are available or not available. Invalid virtual resources may be ignored. This does not cause any ambiguity between the network and the UE.

Alternatively, a set of valid virtual resources may be indicated by the DCI. In determining a valid virtual resource by the dynamic SFI transmitted through the group common PDCCH, the flow resource may be regarded as a valid virtual resource regardless of the SFI transmitted through the group common PDCCH. The SFI transmitted over the group common PDCCH may still indicate resources to avoid any ambiguity between the network and the UE, even though the available resources are changed to UL resources by the SFI and are not available in the DL by the SFI. Alternatively, when a group common PDCCH is configured, only valid DL resources and / or UL resources can be considered as valid virtual resources. The ambiguity that may occur at this time can be processed in the HARQ-ACK procedure. If the group common PDCCH is not configured, DL resources and flow resources can be used as valid virtual resources in the DL, and UL resources and flow resources can be used as valid virtual resources in the UL. If the group common PDCCH is configured and the network does not configure a dynamic resource to DL resources or a dynamic change to UL resources, then the UE only transmits the semi-statically configured DL resources and / or UL resources to valid virtual resources in DL and UL As a valid virtual resource.

- Multiple slot scheduling and / or multiple minislot scheduling may be similarly handled. At this time, each virtual resource may correspond to one slot and / or one minislot.

- Similar frameworks can be used for PDSCH resources, PUSCH resources and / or PUCCH resources. A virtual resource set can define a set of consecutive symbols, and one DCI can point to the start point and time interval of the PDSCH, PUSCH, and / or PUCCH. A plurality of virtual resource sets may be indicated for multiple slot scheduling and / or multiple minislot scheduling. The virtual resource may be a set of slots in a radio frame, a set of minislots in a slot, a set of minislots in a radio frame, and a set of symbols in a radio frame.

- Different virtual resource sets can be configured for each PUCCH format. For example, different virtual resource sets can be configured for a short PUCCH format and a long PUCCH format. Different virtual resource sets may be used depending on the selection of the PUCCH format.

2. Semi-static codebook and time-domain tables

If the UE is configured with a time domain table and the UE supports one or more PDSCHs in one slot, the UE needs to transmit one or more HARQ-ACK bits for each CC, assuming that the HARQ-ACK is transmitted on a slot-by-slot basis. Since there may be overlapping time-domain resources at this time, how to determine the size of the codebook for HARQ-ACK needs to be clearly defined.

For example, if the time domain resource is [1, 2, 3, 4], [5, 6, 7], [8, 9, 10, 11, 12], [1, 2] [5, 6, 7], [8, 9] and the UE is scheduled with [5, 6, 7], it should be clearly determined where the data is scheduled. [1, 2], [3, 4], [5, 6, 7], [8, 9] in this embodiment if the size of the HARQ-ACK codebook is determined based on the non- , 10, 11, 12]. For each time-domain entry, the HARQ-ACK bit out of the four bits needs to be explicitly determined. If multiple bits are used per multiple-input multiple-output (MIMO) or TB, the HARQ-ACK bit may be doubled or the maximum number of codewords may be further determined for each time domain entry.

The HARQ-ACK bit order K in the slot is set to 1 by default. If there is a time-domain opportunity starting at each symbol I, the HARQ-ACK bit for the corresponding time-domain entry is carried on the Kth bit and K increases. And I increases.

In the above-described embodiment, [1, 2] is mapped to the first bit, [3, 4] is mapped to the second bit, and [8, 9] is mapped to the fourth bit. For each PDSCH, when the PDSCH starts at symbol m, the symbol m is mapped to the kth bit. In cross-slot scheduling or multi-slot scheduling, this may actually be done in the slot to which the PDSCH is mapped. For example, if cross slot scheduling indicates 2 slots, the corresponding PDSCH resource set can be used. For example, if the DL association set is [1, 2, 3, 4] and CORESET monitoring can occur every slot, the DL association set is fixed to [1, 2, 3, 4] before the HARQ-ACK slot . In order to count the number of non-overlapping PDSCHs in a slot, the PDSCH scheduled by cross slot scheduling should also be considered. For example, the n-4th slot may be considered as a PDSCH of the same slot and a cross slot PDSCH if there is a cross slot entry. In multi-slot scheduling, the last PDSCH and / or last transmission opportunity may be used. For example, when a plurality of slots are 4 slots, the PDSCH of the 4th slot can be used to count the number of PDSCHs that do not overlap in the slot.

In order to further reduce the size of the HARQ-ACK codebook, the size of the codebook may be calculated for each slot, and the UE may assume that there is no DL transmission in the symbols that are not semi-statically configured DL symbols and / or floating symbols. That is, the UE can calculate the size of the HARQ-ACK codebook considering only DL symbols and / or floating symbols configured semi-statically. Otherwise, all slots may be DL symbols and / or floating symbols. In the multi-slot scheduling, the timing of K1 may start in the last slot regardless of the actual transmission. Alternatively, K1 may start at the last of the plurality of slots requiring dynamic computation of the size of the HARQ-ACK codebook in each slot.

The above discussion assumes that the PDSCH is not scheduled to overlap in any symbol, and that the network has no ambiguity. However, there are cases where ambiguity may arise. For example, the transmission opportunity is [1, 2, 3, 4], [5, 6, 7], [8, 9, 10, 11, 12], [1, 2] , [6, 7], [7, 8, 9]. [5, 6, 7], [8, 9, 10, 11, 12] or [1, 2], [3, 4, 5] , [6, 7] or [1, 2], [3, 4, 5], [7, 8, 9]. Therefore, the HARQ-ACK bit needs to be determined based on the combination at each transmission opportunity, and the maximum PDSCH can be scheduled including the indicated transmission opportunity. For example, [5, 6, 7] can be mapped to the second bit assuming the worst case. However, when the UE transmits a plurality of slots, it is difficult to know whether or not the UE has received DCI, since all bits will be configured as NACK (non-acknowledgment) when there is no indication that the DCI has been received. For example, if the network transmits [8, 9, 10, 11, 12] and the UE has not received a DCI, the UE will send a 3-bit NACK, but the network may find it difficult to distinguish.

In summary, the HARQ-ACK bits may be determined based on a maximum combination comprising one or more PDSCHs scheduled in a given slot. Otherwise, the maximum value of all combinations may be used. The bit order can also be determined based on the selected combination. Thus, the UE needs to maintain a list of combinations. In determining the bit index, for each time-domain resource allocation entry, the number M of scheduled maximum PDSCHs in symbols 0 to L-1 may be calculated and the bit index M + 1 may be determined. L is the symbol index at which the corresponding time-domain resource allocation entry starts.

The overall algorithm is as follows. For each time-domain entry P, the maximum number M of non-overlapping PDSCHs ending before the start symbol P is calculated and the HARQ-ACK bit order for P may be determined as M + 1. The size of the codebook in the slot can be determined as [the maximum value of M for all P] + 1.

If the PDSCHs overlap each other, then K = 0 is set, and if there is a perceived time-domain entry in each symbol I, K is increased. K is determined by the HARQ-ACK bits in the slot. At this time, the cross slot is not considered as a potential start PDSCH in a given slot. On the other hand, it can be used irrespective of whether PDSCHs overlap or not, and the UE can notify NACK when the overlapping PDSCHs are omitted. For example, if the [1, 2, 3, 4, 5] and [5, 6, 7, 8] entries are available and the non-overlapping maximum PDSCH is 1, then the codebook size may be one. However, if both are scheduled, the UE may omit either. If the network schedules both and the UE indicates 1 and the UE misses the DCI, ambiguity may arise as to which is scheduled. In this case, two bits can be used.

The above-described method can be extended even when the non-slot-based PUCCH is scheduled and the DL association set is defined as a non-slot instead of a slot. Within a non-slot, a similar method can be applied.

3. Basic Timing Table

When the UE is configured from the RMSI / OSI (other SI) basic timing table, how the corresponding basic timing table is applied must be clearly defined. The following options may be considered.

The basic timing table can only be used for data scheduled by CORESET 0. The UE-specific time-domain table may be used for other cases (e.g., data scheduled by CORESET other than CORESET 0).

Timing tables organized by RMSI can only be used for CSS 2 and USS (ie for Random Access Response (RAR) and unicast data). On the other hand, a basic timing table may be used for other cases (e.g., CSS 0/1/3) for RMSI / OSI / paging.

- Timing tables organized by RMSI can be used for all data scheduled by CORESET 0 or CORESET X if CORESET configuration pattern # 1 is used. If CORESET 0 or CORESET X uses a different CORESET pattern, the timing table constructed by RMSI can only be used for CSS 2 and USS (ie for RAR and unicast data). That is, when beam sweeping is used, the SI / paging can be scheduled based on the basic timing table, while other data can be scheduled based on different time-domain resource allocation from the RMSI. To this end, the RSI table may be overwritten by the UE specific resource allocation scheme.

- CSS with CORESET non-zero CORESET can follow the timing table configured by RMSI, and UE specific configuration can be used for USS.

- CSS for SI / paging can follow the timing table or basic timing table configured by RMSI, and CSS for RAR / C-RNTI (cell radio network temporary identifier) can use UE specific resource allocation table .

- If the CORESET scheduling SI / Paging is configured based on the CORESET configuration pattern # 1, # 2 or # 3 (ie beam sweep configuration), the CSS for SI / Paging can follow the basic timing table. Otherwise, a timing table constructed by the RMSI or a UE specific timing table may be used.

The CORESET pattern can be used to construct other CORESETs in other DL BWPs for beam sweeping. Patterns identical or similar to CORESET configuration patterns # 1, # 2, or # 3 can be reused, especially for CORESETs used for PDCCH order or beam failover.

4. Frequency and time-domain resource allocation for MSG3 transmission

When assigning the MSG3 of the random access procedure to a BWP other than the initial UL BWP, the frequency domain resource allocation for the MSG3 transmission, i.e., the start location, bandwidth size and / or frequency range, needs to be clearly determined. In addition, bandwidth information is needed to determine frequency-domain resource allocation for MSG3 transmission. It also needs to be clearly determined whether a basic timing table is used for time domain resource allocation for MSG3 transmission. The basic timing table may be predetermined or may be configured by RMSI. With respect to frequency domain resource allocation, the following options may be considered.

 The frequency location and bandwidth for the MSG3 transmission may be determined based on the active UL BWP of the UE. It is necessary to be clearly determined at least in a contentionless random access procedure whether the network certainly knows whether UEs sharing the same UL BWP share the same RACH resource. This option can be used in a contentionless random access procedure where the PUSCH is scheduled by RAR.

The frequency location and bandwidth for the MSG3 transmission may be determined based on the UE ' s initial UL BWP. The advantage of this option is that MSG3 can be scheduled with common information between the network and the UE. More specifically, there may be a plurality of UEs having different UL BWPs but sharing a PRACH resource, and the MSG3 can be scheduled based on the same initial UL BWP for the plurality of UEs. The starting frequency of the MSG3 transmission may be determined based on the smallest PRB index of the active UL BWP of the UE (i.e., the starting PRB of the active UL BWP) or the smallest PRB index of the configured RACH resources. The size of the bandwidth for the MSG3 transmission may be equal to the size of the initial UL BWP. This is based on the assumption that the UE sharing the PRACH resource has at least the same starting point of the active UL BWP. In this case, by adjusting the bandwidth of the frequency resource for MSG3 transmission to the bandwidth of the initial UL BWP, it is not necessary to set the last PRB of the active UL BWP of each UE to be the same. As a result, it gives the network a degree of freedom in setting the active UL BWP.

The frequency location and bandwidth for the MSG3 transmission may be determined based on the UE ' s initial DL BWP. The starting frequency of the MSG3 transmission may be determined based on the smallest PRB of the active DL BWP of the UE or the smallest PRB of the configured RACH resources. The size of the bandwidth for the MSG3 transmission may be equal to the size of the initial DL BWP. More specifically, in determining the frequency domain resource allocation for MSG3 transmission within the active UL BWP, the frequency resource for transmission of MSG3 is equal to the number of RBs in the initial UL BWP, starting from the first RB of the active UL BWP. To the number of RBs.

- The frequency location and bandwidth for the MSG3 transmission can be explicitly configured. Alternatively, the bandwidth for the MSG3 transmission may be fixed in advance. The bandwidth for MSG3 transmission may be different for different frequency ranges, or different for each RACH configuration (e.g., PRACH type). If the bandwidth for the MSG3 transmission is fixed in advance, the frequency position for the MSG3 transmission may be determined as the starting point of the active UL BWP and / or the starting point of the PRACH resource, or a fixed DL-UL gap may also be considered.

Whether the MSG3 is transmitted on the UL carrier or the SUL carrier when the UL carrier and the SUL (supplemental UL) carrier are both configured in the cell can be determined by the PRACH unless otherwise indicated. For example, the MSG3 may be transmitted along with the carrier on which the PRACH preamble is transmitted. Thus, the frequency domain resource allocation may then be determined based on the active UL BWP and / or the initial UL BWP on the carrier on which the PRACH preamble is transmitted.

13 illustrates a method by which a UE transmits MSG3 in a random access procedure according to an embodiment of the present invention. The present invention described above on the UE side can be applied to this embodiment.

In step S1300, the UE determines a frequency resource for transmission of the MSG3. The starting position of the frequency resource is the smallest PRB of the active UL BWP, and the bandwidth of the frequency resource is equal to the bandwidth of the initial UL BWP.

In step S1310, the UE transmits the MSG3 to the network through the frequency resource.

The active UL BWP may not include the initial UL BWP. The MSG3 may be transmitted to the network via the active UL BWP. The MSG3 may be transmitted to the network via the active UL BWP located on either the UL carrier or the SUL carrier. The UL carrier or the SUL carrier including the active UL BWP through which the MSG3 is transmitted may be the same carrier file as the carrier to which the random access preamble is transmitted.

According to an embodiment of the present invention described in FIG. 13, frequency resources for MSG3 transmission in the random access procedure can be effectively determined. In particular, when the active UL BWP does not include the initial UL BWP, the transmission of MSG3 over the active UL BWP may be based on the initial UL BWP.

14 shows a UE in which an embodiment of the present invention is implemented. The present invention described above on the UE side can be applied to this embodiment.

The UE 1400 includes a processor 1410, a memory 1420, and a transceiver 1430. Processor 1410 may be configured to implement the functions, processes, and / or methods described herein. A layer of air interface protocol may be implemented within the processor 1410. More specifically, the processor 1410 controls the transceiver 1430 to determine the frequency resource for transmission of the MSG3 in the random access procedure, and to transmit the MSG3 to the network via the frequency resource. The starting position of the frequency resource is the smallest PRB of the active UL BWP, and the bandwidth of the frequency resource is equal to the bandwidth of the initial UL BWP.

The active UL BWP may not include the initial UL BWP. The MSG3 may be transmitted to the network via the active UL BWP. The MSG3 may be transmitted to the network via the active UL BWP located on either the UL carrier or the SUL carrier. The UL carrier or the SUL carrier including the active UL BWP through which the MSG3 is transmitted may be the same carrier file as the carrier to which the random access preamble is transmitted.

The memory 1420 is coupled to the processor 1410 to store various information for driving the processor 1410. Transceiver 1430 is coupled to processor 1410 to transmit and / or receive wireless signals.

Processor 1410 may include an application-specific integrated circuit (ASIC), other chipset, logic circuitry, and / or data processing device. Memory 1420 can include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and / or other storage devices. The transceiver 1430 may include a baseband circuit for processing a radio frequency signal. When the embodiment is implemented in software, the above-described techniques may be implemented with modules (processes, functions, and so on) that perform the functions described above. The module may be stored in memory 1420 and executed by processor 1410. [ The memory 1420 can be internal or external to the processor 1410 and can be coupled to the processor 1410 in a variety of well known ways.

According to one embodiment of the present invention described in FIG. 14, the processor 1410 can effectively determine frequency resources for MSG3 transmission in a random access procedure. In particular, when the active UL BWP does not include the initial UL BWP, the transmission of MSG3 over the active UL BWP may be based on the initial UL BWP.

15 illustrates a method by which a BS and a UE perform a random access procedure according to an embodiment of the present invention. The present invention described above on the BS / UE side can be applied to this embodiment.

In step S1500, the UE transmits a random access preamble to the BS. In step S1510, the BS transmits a random access response to the UE, which is a response to the random access preamble.

In step S1520, the UE determines a frequency resource for transmission of the MSG3. The starting position of the frequency resource is the smallest PRB of the active UL BWP, and the bandwidth of the frequency resource is equal to the bandwidth of the initial UL BWP.

In step S1530, the UE transmits the MSG3 to the network through the frequency resource.

The active UL BWP may not include the initial UL BWP. The MSG3 may be transmitted to the network via the active UL BWP. The MSG3 may be transmitted to the network via the active UL BWP located on either the UL carrier or the SUL carrier. The UL carrier or the SUL carrier including the active UL BWP through which the MSG3 is transmitted may be the same carrier file as the carrier to which the random access preamble is transmitted.

According to an embodiment of the present invention described in FIG. 15, frequency resources for MSG3 transmission in the random access procedure can be effectively determined. In particular, when the active UL BWP does not include the initial UL BWP, the transmission of MSG3 over the active UL BWP may be based on the initial UL BWP.

16 shows a BS in which an embodiment of the present invention is implemented. The present invention described above on the BS side can be applied to this embodiment.

The BS 1600 includes a processor 1610, a memory 1620, and a transceiver 1630. The processor 1610 may be configured to implement the functions, processes, and / or methods described herein. A layer of the air interface protocol may be implemented within the processor 1610. More specifically, the processor 1610 controls the transceiver 1630 to receive a random access preamble from the UE, and controls the transceiver 1630 to transmit a random access response, which is a response to the random access preamble, to the UE And controls the transceiver 1630 to receive the MSG3 from the UE through a frequency resource for transmission of the MSG3. The starting position of the frequency resource is the smallest PRB of the active UL BWP, and the bandwidth of the frequency resource is equal to the bandwidth of the initial UL BWP.

The active UL BWP may not include the initial UL BWP. The MSG3 may be transmitted to the network via the active UL BWP. The MSG3 may be transmitted to the network via the active UL BWP located on either the UL carrier or the SUL carrier. The UL carrier or the SUL carrier including the active UL BWP through which the MSG3 is transmitted may be the same carrier file as the carrier to which the random access preamble is transmitted.

The memory 1620 is coupled to the processor 1610 to store various information for driving the processor 1610. Transceiver 1630 is coupled to processor 1610 to transmit and / or receive a radio signal.

Processor 1610 may comprise an ASIC, another chipset, logic circuitry and / or a data processing device. Memory 1620 may include ROM, RAM, flash memory, memory cards, storage media, and / or other storage devices. The transceiver 1630 may include a baseband circuit for processing a radio frequency signal. When the embodiment is implemented in software, the above-described techniques may be implemented with modules (processes, functions, and so on) that perform the functions described above. The module may be stored in memory 1620 and executed by processor 1610. [ The memory 1620 can be internal or external to the processor 1610 and can be coupled to the processor 1610 in a variety of well known ways.

According to one embodiment of the present invention described in FIG. 16, the processor 1610 may control the transceiver 1630 to effectively receive the MSG3 through the determined frequency resource in the random access procedure. In particular, when the active UL BWP does not include the initial UL BWP, the transmission of MSG3 over the active UL BWP may be based on the initial UL BWP.

In the above-described exemplary system, the methods that may be implemented according to the features of the invention described above have been described based on the flowchart. For convenience, the methods have been described as a series of steps or blocks, but the claimed features of the invention are not limited to the order of steps or blocks, and some steps may occur in different orders or in a different order than the other steps. It will also be understood by those skilled in the art that the steps shown in the flowchart are not exclusive and that other steps may be included or that one or more steps in the flowchart may be deleted without affecting the scope of the invention.

Claims (15)

1. A method for transmitting a MSG3 in a random access procedure by a user equipment (UE) in a wireless communication system,

   Determine a frequency resource for transmission of the MSG3 in the random access procedure; And

   And transmitting the MSG3 to the network via the frequency resource,

   The starting position of the frequency resource is the smallest physical resource block (PRB) of an active uplink (UL) bandwidth part (BWP)

   Wherein the bandwidth of the frequency resource is equal to the bandwidth of the initial UL BWP.
2. The method according to claim 1,

   Wherein the active UL BWP does not comprise the initial UL BWP.
3. The method according to claim 1,

   And the MSG3 is transmitted to the network via the active UL BWP.
4. The method of claim 3,

   And the MSG3 is transmitted to the network via the active UL BWP located on either the UL carrier or the SUL (supplemental) carrier.
5. 5. The method of claim 4,

   Wherein the UL carrier or the SUL carrier including the active UL BWP to which the MSG3 is transmitted is the same carrier as the carrier to which the random access preamble is transmitted.
6. In a user equipment (UE) in a wireless communication system,

   Memory;

   A transmission / reception unit; And

   And a processor coupled to the memory and the transceiver,

   The processor comprising:

   Determine a frequency resource for transmission of MSG3 in a random access procedure, and

   Controls the transceiver to transmit the MSG3 to the network through the frequency resource,

   The starting position of the frequency resource is the smallest physical resource block (PRB) of an active uplink (UL) bandwidth part (BWP)

   Wherein the bandwidth of the frequency resource is equal to the bandwidth of the initial UL BWP.
7. The method according to claim 6,

   Wherein the active UL BWP does not include the initial UL BWP.
8. The method according to claim 6,

   And the MSG3 is transmitted to the network via the active UL BWP.
9. 9. The method of claim 8,

   Wherein the MSG3 is transmitted to the network via the active UL BWP located on either the UL carrier or the SUL (supplemental) carrier.
10. 10. The method of claim 9,

    Wherein the UL carrier or the SUL carrier including the active UL BWP to which the MSG3 is transmitted is the same carrier as a carrier to which a physical random access channel (PRACH) preamble is transmitted.
11. A method for receiving MSG3 in a random access procedure by a base station (BS) in a wireless communication system,

    Receiving a random access preamble from a user equipment (UE);

    Transmit a random access response to the UE that is a response to the random access preamble; And

    And receiving the MSG3 from a UE via a frequency resource for transmission of the MSG3,

    The starting position of the frequency resource is the smallest physical resource block (PRB) of an active uplink (UL) bandwidth part (BWP)

    Wherein the bandwidth of the frequency resource is equal to the bandwidth of the initial UL BWP.
12. 12. The method of claim 11,

    Wherein the active UL BWP does not comprise the initial UL BWP.
13. 12. The method of claim 11,

    And the MSG3 is received from the UE via the active UL BWP.
14. 14. The method of claim 13,

    Wherein the MSG3 is received from the UE via the active UL BWP located on either the UL carrier or the SUL (supplemental) carrier.
15. 15. The method of claim 14,

    Wherein the UL carrier or the SUL carrier including the active UL BWP from which the MSG3 is received is the same carrier as the carrier on which the random access preamble is received.

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