WO2019087359A1

WO2019087359A1 - User equipment and wireless communication method

Info

Publication number: WO2019087359A1
Application number: PCT/JP2017/039782
Authority: WO
Inventors: 和晃武田; 聡永田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2017-11-02
Filing date: 2017-11-02
Publication date: 2019-05-09

Abstract

The purpose of the present invention is to suitably set a partial band in a carrier. This user equipment is characterized by including: a transmission unit which transmits a random access preamble by using one of a plurality of wireless resources in a random access procedure; and a control unit which controls communication in the random access procedure by using at least one partial band associated with the used wireless resource.

Description

User terminal and wireless communication method

The present invention relates to a user terminal and a wireless communication method in a next-generation mobile communication system.

In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) has been specified for the purpose of further higher data rates, lower delays, etc. (Non-Patent Document 1). Also, for the purpose of achieving wider bandwidth and higher speed from LTE, successor systems of LTE (for example, LTE-A (LTE-Advanced), FRA (Future Radio Access), 4G, 5G, 5G + (plus), NR ( New RAT), LTE Rel. 14, 15, and so on are also considered.

Also, in the existing LTE system (for example, LTE Rel. 8-13), downlink (DL: Downlink) and / or uplink (UL: Uplink) communication is performed with a subframe of 1 ms as a scheduling unit. For example, in the case of Normal Cyclic Prefix (NCP), the subframe is composed of 14 symbols of 15 kHz subcarrier spacing. The subframes are also referred to as transmission time intervals (TTIs) or the like.

Also, the user terminal (UE: User Equipment) is a DL data channel based on downlink control information (DCI: Downlink Control Information) (also referred to as DL assignment etc.) from a radio base station (for example, eNB: eNodeB). It controls reception of (for example, PDSCH: Physical Downlink Shared Channel, DL Shared Channel, etc.). Also, the user terminal controls transmission of a UL data channel (for example, PUSCH: also referred to as Physical Uplink Shared Channel, UL shared channel, etc.) based on DCI (also referred to as UL grant, etc.) from the radio base station.

In the future wireless communication system (for example, NR), a user terminal is a control resource area (for example, control resource set (CORESET: control resource) which is a candidate area to which a DL control channel (for example, PDCCH: Physical Downlink Control Channel) is allocated. It is considered to receive (detect) DCI by monitoring (blind decoding)).

Also, in the future wireless communication system, one or more partial frequency bands (Partial Band), bands within a carrier (also referred to as component carrier (CC) or system band etc.) It has been considered to use a width part (BWP: Bandwidth part, etc.) for DL and / or UL communication (DL / UL communication).

As described above, when one or more partial bands are set in the carrier, if the partial band is not set appropriately, system performance such as reduction in utilization efficiency of radio resources (for example, frequency resources), reduction in throughput, etc. Degradation may occur.

The present invention has been made in view of the foregoing, and it is an object of the present invention to provide a user terminal and a wireless communication method capable of appropriately setting a partial band in a carrier.

In a random access procedure, a user terminal according to an aspect of the present invention transmits a random access preamble using one of a plurality of radio resources, and at least one partial band associated with the used radio resources. And a controller configured to control communication in the random access procedure.

According to the present invention, the partial band can be appropriately set in the carrier.

FIGS. 1A to 1C are diagrams showing an example of a setting scenario of BWP. It is a figure which shows an example of control of activation / deactivation of BWP. FIG. 7 illustrates an example of control of activation or deactivation of one or more BWPs in an S cell. It is a figure which shows an example of correlation of a RACH resource and default DL / UL BWP. It is a figure which shows an example of the RACH resource and default DL / UL BWP which are used for a random access procedure. 6A and 6B are diagrams showing an example of the association of the RACH resource and the default DL / UL BWP in the second aspect. FIG. 7A and FIG. 7B are diagrams showing a modification of association of RACH resources and default DL / UL BWP in the second aspect. It is a figure which shows an example of schematic structure of the radio | wireless communications system which concerns on this Embodiment. It is a figure which shows an example of the whole structure of the wireless base station which concerns on this Embodiment. It is a figure which shows an example of a function structure of the wireless base station which concerns on this Embodiment. It is a figure which shows an example of the whole structure of the user terminal which concerns on this Embodiment. It is a figure which shows an example of a function structure of the user terminal which concerns on this Embodiment. It is a figure which shows an example of the hardware constitutions of the wireless base station which concerns on this Embodiment, and a user terminal.

In the future wireless communication systems (for example, NR, 5G or 5G +), carriers (component carriers (CC: Component Carrier) having a wider bandwidth (for example, 100 to 800 MHz) than existing LTE systems (for example, LTE Rel. 8-13) It is considered to assign a carrier (also referred to as a cell or a system band).

On the other hand, in the future wireless communication system, a user terminal (also referred to as Wideband (WB) UE, single carrier WB UE, etc.) capable of transmitting and / or receiving (transmitting / receiving) over the entire carrier and the carrier It is assumed that user terminals (also referred to as BW reduced UE etc.) that do not have the ability to transmit and receive as a whole coexist.

Thus, in the future wireless communication system, it is assumed that a plurality of user terminals with different supported bandwidths are mixed (various BW UE capabilities), so that one or more partial frequency bands in the carrier are allocated. It is considered to configure statically. Each frequency band (for example, 50 MHz or 200 MHz) in the carrier is called a sub-band or bandwidth part (BWP) or the like.

FIG. 1 is a diagram illustrating an example of a BWP setting scenario. FIG. 1A shows a scenario (Usage scenario # 1) in which one BWP is set as a user terminal in one carrier. For example, in FIG. 1A, a 200 MHz BWP is set in an 800 MHz carrier. The activation or deactivation of the BWP may be controlled.

Here, BWP activation means being in a usable state (or transitioning to the usable state), and activating BWP setting information (configuration) (BWP setting information) or It is also called validation. In addition, the deactivation of the BWP means that the BWP is in an unusable state (or transits to the unusable state), and is also called deactivation or invalidation of BWP setting information.

FIG. 1B shows a scenario (Usage scenario # 2) in which a plurality of BWPs are set in a user terminal in one carrier. As shown in FIG. 1B, at least a portion of the plurality of BWPs (eg, BWPs # 1 and # 2) may overlap. For example, in FIG. 1B, BWP # 1 is a partial frequency band of BWP # 2.

Also, at least one activation or deactivation of the plurality of BWPs may be controlled. Also, the number of BWPs activated at any given time may be limited (eg, only one BWP may be active at any given time). For example, in FIG. 1B, only one of BWP # 1 or # 2 is active at a certain time.

For example, in FIG. 1B, BWP # 1 may be activated when data transmission / reception is not performed, and BWP # 2 may be activated when data transmission / reception is performed. Specifically, when data to be transmitted or received is generated, switching from BWP # 1 to BWP # 2 may be performed, and when data transmission / reception is completed, switching from BWP # 2 to BWP # 1 may be performed. . As a result, the user terminal does not have to constantly monitor BWP # 2, so power consumption can be suppressed.

Note that, in FIGS. 1A and 1B, the network (for example, a radio base station) may not assume that the user terminal receives and / or transmits outside the BWP in the active state. In addition, in FIG. 1A, the user terminal supporting the entire carrier is not suppressed at all from receiving and / or transmitting a signal outside the BWP.

FIG. 1C shows a scenario (Usage scenario # 3) in which a plurality of BWPs are set in different bands in one carrier. As shown in FIG. 1C, different numerologies may be applied to the plurality of BWPs. Here, the neurology includes at least one of subcarrier spacing, symbol length, slot length, cyclic prefix (CP) length, slot (transmission time interval (TTI)) length, number of symbols per slot, etc. It may be one.

For example, in FIG. 1C, BWPs # 1 and # 2 having different neurology are set for user terminals having the ability to transmit and receive in the entire carrier. In FIG. 1C, at least one BWP configured for a user terminal may be activated or deactivated, and at one time, one or more BWPs may be active.

In addition, BWP used for DL communication may be called DL BWP (frequency band for DL), and BWP used for UL communication may be called UL BWP (frequency band for UL). DL BWP and UL BWP may overlap at least a part of frequency bands. Hereinafter, when the DL BWP and the UL BWP are not distinguished, they are collectively referred to as BWP.

At least one of DL BWPs set in the user terminal (e.g., DL BWPs included in the primary CC) may include a control resource region that is a candidate for assignment of a DL control channel (DCI). The control resource region is called a control resource set (CORESET), a control subband, a search space set, a search space resource set, a control region, a control subband, an NR-PDCCH region, etc. It is also good.

The user terminal monitors one or more search spaces in CORESET to detect DCI for the user terminal. The search space is a common search space (CSS: Common Search Space) in which a common DCI (for example, group DCI or common DCI) is arranged for one or more user terminals and / or a user terminal-specific DCI (for example, DL assignment) And / or a UL grant) may be included in a user terminal (UE) specific search space (USS).

The user terminal may receive CORESET configuration information (CORESET configuration information) using higher layer signaling (for example, RRC (Radio Resource Control) signaling or the like). The CORESET configuration information includes frequency resources (eg, number of RBs and / or start RB index) of each CORESET, time resources (eg, start OFDM symbol number), duration (duration), REG (resource element group) bundle size (eg It may indicate at least one of REG size), transmission type (eg, interleaving, non-interleaving), cycle (eg, monitor cycle per CORESET), and so on.

Control of activation and / or deactivation (also referred to as activation / deactivation or switching, etc.) of the BWP will be described with reference to FIG. FIG. 2 is a diagram showing an example of control of activation / deactivation of BWP. Although FIG. 2 assumes the scenario shown in FIG. 1B, the control of activation / deactivation of the BWP can be appropriately applied to the scenario shown in FIGS. 1A and 1C.

Further, in FIG. 2, CORESET # 1 is set in BWP # 1, and CORESET # 2 is set in BWP # 2. Each of CORESET # 1 and CORESET # 2 is provided with one or more search spaces. For example, in CORESET # 1, DCI for BWP # 1 and DCI for BWP # 2 may be located in the same search space, or may be located in different search spaces.

Further, in FIG. 2, when BWP # 1 is in the active state, the user terminal is in CORESET # 1 in a predetermined cycle (for example, every one or more slots, every one or more minislots, or each predetermined number of symbols). The search space is monitored (blind decoding) to detect DCI for the user terminal.

The DCI may include information (BWP information) indicating which BWP the DCI is for. The said BWP information is an index of BWP, for example, and should just be a predetermined field value in DCI. The user terminal may determine the BWP for which the PDSCH or PUSCH is scheduled by the DCI based on the BWP information in the DCI.

When the user terminal detects DCI for BWP # 1 in CORESET # 1, based on the DCI for BWP # 1, the predetermined time and / or frequency resource (time / frequency resource) in BWP # 1 is detected. Receive a scheduled (assigned) PDSCH.

Also, when detecting a DCI for BWP # 2 in CORESET # 1, the user terminal deactivates BWP # 1 and activates BWP # 2. The user terminal receives a PDSCH scheduled to a predetermined time / frequency resource of DL BWP # 2 based on the DCI for BWP # 2 detected in CORESET # 1.

In FIG. 2, although the DCI for BWP # 1 and the DCI for BWP # 2 are detected at different timings in CORESET # 1, a plurality of DCI of different BWPs may be detected at the same timing. For example, a plurality of search spaces corresponding to each of a plurality of BWPs may be provided in the CORESET # 1, and a plurality of DCIs of different BWPs may be transmitted in the plurality of search spaces. The user terminal may monitor a plurality of search spaces in CORESET # 1 to detect a plurality of DCIs of different BWPs at the same timing.

When BWP # 2 is activated, the user terminal monitors the search space in CORESET # 2 in a predetermined cycle (for example, every one or more slots, every one or more minislots, or each predetermined number of symbols) (blind) Decode to detect DCI for BWP # 2. The user terminal may receive a PDSCH scheduled to a predetermined time / frequency resource of BWP # 2 based on the DCI for BWP # 2 detected in CORESET # 2.

Although a predetermined time is shown in FIG. 2 for switching between activation and deactivation, the predetermined time may not be present.

As shown in FIG. 2, when BWP # 2 is activated with detection of DCI for BWP # 2 in CORESET # 1 as a trigger, BWP # 2 can be activated without explicit indication information, so Can be prevented from increasing overhead associated with

On the other hand, in FIG. 2, even if the user terminal misses detection of DCI for BWP # 2 (that is, DCI for activation of BWP # 2) in CORESET # 1, the radio base station does not Unable to recognize detection failure. Therefore, although the user terminal continues to monitor CORESET # 1 of BWP # 1, the radio base station erroneously recognizes BWP # 2 as the user terminal can use it, and the PDSCH in BWP # 2 is erroneously recognized. There is a risk of sending DCI on CORESET # 2 to schedule.

In this case, when the radio base station can not receive the delivery confirmation information (also referred to as HARQ-ACK, ACK / NACK or A / N, etc.) of the PDSCH in a predetermined period, the user terminal is for BWP # 2 activation. It is recognized that the detection of the DCI of the above has failed, and CORESET # 1 may retransmit the DCI for activation. Alternatively, although not shown in FIG. 2, a common CORESET may be provided for BWPs # 1 and # 2.

Also, if a data channel (eg, PDSCH and / or PUSCH) is not scheduled for a predetermined period in the activated BWP, the BWP may be deactivated. For example, in FIG. 2, the user terminal deactivates BWP # 2 and activates BWP # 1, since PDSCH is not scheduled for a predetermined period in DL BWP # 2.

The user terminal may set a timer each time reception of a data channel (for example, PDSCH and / or PUSCH) is completed in the activated BWP, and may deactivate the BWP when the timer expires. . The timer may be a common timer (also referred to as a joint timer or the like) between the DL BWP and the UL BWP, or may be an individual timer.

When a timer is used to deactivate BWP, the overhead associated with controlling deactivation can be reduced because it is not necessary to transmit explicit deactivation indication information.

By the way, the maximum number of BWPs that can be set per carrier may be predetermined. For example, in frequency division duplex (FDD) (Paired spectrum), up to four DL BWPs and up to four UL BWPs may be set per carrier. The combination of one DL BWP and one UL BWP may be called DL / UL BWP.

On the other hand, in time division duplex (TDD) (unpaired spectrum), up to four pairs (DL / UL BWP pair) of DL BWP and UL BWP may be set per carrier. In TDD, DL BWP and UL BWP to be paired may have the same center frequency but different bandwidths.

Although a single carrier is shown above, multiple carriers (also referred to as cells, serving cells, etc.) may be integrated (eg, carrier aggregation (CA: Carrier Aggregation) and / or dual connectivity (DC: Dual Connectivity) )). As described above, one or more BWPs may be set in at least one of the plurality of carriers.

When a plurality of cells are integrated by CA or DC, the plurality of cells may include a primary cell (P cell: Primary Cell) and one or more secondary cells (S cell: Secondary Cell). The PCell corresponds to a single carrier (CC) and may include one or more BWPs. Also, each S cell may correspond to a single carrier (CC) and may include one or more BWPs.

Each BWP of the PCell may be provided with a common search space for a Random Access Channel Procedure (RACH).

Further, each BWP of one or more cells (P cell and / or S cell) is provided with a common search space for PDCCH (group common PDCCH (group-common PDCCH)) common to one or more user terminals. It is also good.

In addition, a specific BWP may be predetermined in the user terminal. For example, BWP (initial active BWP) to which a PDSCH for transmitting system information (for example, RMSI: Remaining Minimum System Information) is scheduled is the frequency position of CORESET for which DCI for scheduling the PDSCH is allocated and It may be defined by bandwidth. Also, an initial active BWP may be applied with the same numerology as the RMSI.

Also, a default BWP (default BWP) may be defined for the user terminal. The default BWP may be the initial active BWP described above, or may be configured by higher layer signaling (eg, RRC signaling).

Next, control of BWP activation / deactivation in the S cell will be described. Based on the result of inter-frequency measurement at the user terminal, the radio base station sets an S cell for the user terminal and sets one or more BWPs in the S cell.

FIG. 3 is a diagram illustrating an example of control of activation or deactivation of one or more BWPs in an S cell. Although BWPs # 1 and # 2 in the S cell are set as user terminals in FIG.

As shown in FIG. 3, in the S cell, a BWP with a wider bandwidth among a plurality of BWPs set in the user terminal may be set as an initial active BWP. The initial active BWP may be notified from the radio base station to the user terminal by higher layer signaling (eg, RRC signaling).

For example, in FIG. 3, BWP # 2 having a wider bandwidth than BWP # 1 may be set (notified) to the user terminal as an initial active BWP. Further, in FIG. 3, BWP # 1 different from the initial active BWP is set (notified) to the user terminal as a default BWP, but the initial active BWP and the default BWP may be set to the same BWP. .

For example, in FIG. 3, every time the user terminal completes the reception of PDSCH in BWP # 2, it starts timer T1 for switching to the default BWP (fallback) and timer T2 for S cell inactivity. You may For example, the period of timer T2 is set longer than the period of timer T1.

In FIG. 3, the user terminal monitors the search space in CORESET # 1 of BWP # 1 at a predetermined cycle (blind decoding) even after activation of timers T1 and T2, but timer T1 expires without detecting DCI. Do. When the timer T1 expires, the user terminal deactivates BWP # 2, which is an initial active BWP, and activates BWP # 1, which is a default BWP.

The user terminal monitors (blind decoding) the search space in CORESET # 1 of the activated BWP # 1 at a predetermined cycle, but the timer T2 expires without detecting the DCI. When timer T2 expires, all BWPs are deactivated and S cells are deactivated.

As described above, when all BWPs of the S cell are deactivated, implicitly, when the S cell is deactivated, the signaling overhead for deactivating the S cell can be reduced.

Next, the problem in the case where a specific BWP (for example, an initial active BWP) is preset to the user terminal will be described.

For example, the user terminal receives a Synchronization Signal (SS) block (also referred to as a SS / PBCH (Physical Broadcast Channel) block) and receives an RMSI based on the SS block. On the other hand, the network does not know the bandwidth supported by the user terminal before connection (for example, in the RRC idle state). The initial active BWP is limited to a predetermined bandwidth (e.g., minimum channel bandwidth) so that all user terminals can receive the RMSI. The minimum channel bandwidth may be defined by the carrier frequency (frequency band).

When a plurality of user terminals use the same preset BWP, traffic congestion may occur in the BWP. Therefore, the present inventors conceived of dispersing BWPs of a plurality of user terminals by setting BWPs at an early stage of communication.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(First aspect)
A plurality of RACH resources (also referred to as PRACH (Physical Random Access Channel) resources) and a plurality of default DL / UL BWPs may be configured in the UE.

The RACH resource is a radio resource used for transmitting an RA (Random Access) preamble (PRACH, also referred to as message 1, Msg. 1) in a random access procedure (RACH procedure: Random Access Channel Procedure). The configuration information (configuration) of the RACH resource may include any of a sequence of RA preamble, a time resource (for example, symbol) of RA preamble, and a frequency resource (for example, PRB: Physical Resource Block) of RA preamble.

The configuration information of the default DL / UL BWP may include the center frequency and bandwidth, may include the lowest frequency and the highest frequency, and the default DL / UL BWP may be represented by a PRB index.

Here, the default DL / UL BWP may be a default DL BWP and a default UL BWP in FDD, or may be a default DL / UL BWP pair in TDD.

The RMSI may include multiple default DL / UL BWP configuration information and / or multiple RACH resource configuration information.

An association between RACH resources and default DL / UL BWP may be configured in the UE. The RMSI may include information indicating an association between the RACH resource and the default DL / UL BWP. For example, setting information on default DL / UL BWP may be included for each setting information of RACH resources.

As shown in FIG. 4, RACH resources # 1 and # 2 and default DL / UL BWP # 1 and # 2 may be set in the UE. Here, RACH resource # 1 is associated with default DL / UL BWP # 1, and RACH resource # 2 is associated with default DL / UL BWP # 2. Here, although the frequency resources of the RACH resources # 1 and # 2 are different, the sequences may be different or the time resources may be different.

The UE may select one of the plurality of RACH resources, and may use the selected RACH resources for transmission of RA preambles. The UE may select RACH resources according to predetermined parameters and / or algorithms.

For example, the UE may select a RACH resource based on the measured reception quality. For example, the relationship between a plurality of ranges of reference signal received power (RSRP) and a plurality of RACH resources is set in advance, and the UE compares the measured RSRP with a preset range or threshold and sets the range to the RSRP. A corresponding RACH resource may be selected.

For example, the UE may randomly select a RACH resource, or may select a RACH resource based on time resources such as the reception timing of the RMSI. Also, the UE may select these RACH resources by combining these selection methods.

The UE may determine the default DL / UL BWP based on the selected RACH resource and the configured association. For example, the UE may switch (transition) to the determined default DL / UL BWP after receiving the RMSI using the initial active BWP. The UE may perform message 2 and subsequent communications using default DL / UL BWP.

The default DL / UL BWP may be one of the default DL BWP and the default UL BWP. In this case, the UE may change only one of DL BWP and UL BWP.

The network may recognize the default DL / UL BWP of the UE based on the RACH resource received from the UE and the association set for the UE. According to such RACH resources and default DL / UL BWP, the network and UE can coordinate the recognition of default DL / UL BWP.

FIG. 5 shows that the UE associates RACH resource # 1 with default DL / UL BWP # 1 (default DL BWP # 1 and default UL BWP # 1), and RACH resource # 2 with default DL / UL BWP # 2 (default) A case is shown where an RMSI indicating association with DL BWP # 2 and default UL BWP # 2) is received and RACH resource # 1 is selected. In this case, the UE selects the default DL / UL BWP # 1 associated with the RACH resource # 1.

In the random access procedure, the UE transmits an RA preamble using the selected RACH resource # 1.

Thereafter, the UE receives message 2 (Msg. 2, Random Access Response: RAR) using the selected default DL BWP # 1. For example, the UE receives message 2 by monitoring the common search space in default DL BWP # 1.

After that, the UE transmits message 3 (Msg. 3, upper layer control message) using the selected default UL BWP # 1.

After that, the UE receives message 4 (Msg. 4, Contention resolution message) using the selected default DL BWP # 1. By this random access procedure, the UE transitions from the RRC idle state to the RRC connected state.

The default DL BWP may include a common search space. The common search space may be used to receive message 2 in the default DL BWP. The configuration information of the default DL / UL BWP may include configuration information of the common search space.

The default UL BWP may include PUCCH resources in a random access procedure. PUCCH resources may be used for HARQ-ACK transmission in the default UL BWP. Default DL / UL BWP configuration information may include PUCCH resource configuration information.

Also, the default DL BWP may include UE specific search space. This UE specific search space may be used after RRC connection. The default DL / UL BWP configuration information may include UE-specific search space configuration information.

Also, the default DL / UL BWP may include CSI-RS (Channel State Information-Reference Signal) and / or SRS (Sounding Reference Signal). The default DL / UL BWP configuration information may include CSI-RS and / or SRS configuration information. By performing measurement using CSI-RS or SRS during the random access procedure, it is possible to improve the quality of communication from an early stage.

Multiple RACH resources and multiple default DL / UL BWPs may be configured in the UE by message 2 or message 4. Also, DL / UL BWP different from DL / UL BWP set by RMSI may be set by message 2 or message 4. Also, a DL / UL BWP different from the DL / UL BWP set by the message 2 may be set by the message 4.

The UE may use the selected default DL / UL BWP during the random access procedure.

Also, the network may assign a different default DL / UL BWP to each UE, using UE-specific upper layer signaling (eg, RRC signaling), for UEs after connection (eg, in RRC connected state). This operation can avoid traffic congestion in a particular BWP.

By associating DL / UL BWP with RACH resources and setting DL / UL BWP during the random access procedure, it is possible to offload traffic from the early stages of communication. Therefore, traffic congestion in a specific BWP can be avoided. In particular, the performance in random access procedures can be improved.

(Second aspect)
The association of RACH resources and default DL / UL BWP may not be one to one.

One default DL / UL BWP may be associated with multiple RACH resources. For example, as shown in FIG. 6A, RACH resources # 1 and # 2 may be associated with default DL / UL BWP # 1. Such association may be used if traffic using the default DL / UL BWP # 1 is not congested.

According to such association, even when the number of default DL / UL BWP candidates is smaller than the number of RACH resource candidates, the default DL / UL BWPs of a plurality of UEs can be distributed.

One RACH resource may be associated with multiple default DL / UL BWPs. For example, as shown in FIG. 6B, RACH resource # 1 may be associated with default DL / UL BWP # 1, # 2. Such association may be used if traffic using RACH resource # 1 is not congested.

If the UE selects a RACH resource associated with two or more default DL / UL BWPs, even if one of the corresponding two or more default DL / UL BWPs is selected based on the specific parameters of the RACH resources Good. For example, when two default DL / UL BWPs are set, the default DL / UL BWP may be selected depending on whether the index (frequency, time resource, sequence) indicating the RACH resource is even or odd. The UE may select the default DL / UL BWP according to predetermined parameters and / or algorithms.

For example, the UE may select a default DL / UL BWP from two or more default DL / UL BWPs associated with the selected RACH resource based on time resources such as reception timing of the RMSI. Also, the UE may select a default DL / UL BWP by combining these selection methods.

The network may select the default DL / UL BWP from two or more default DL / UL BWPs associated with the received RACH resource based on time resources such as timing of reception of the RMSI, similarly to the UE. .

One default DL / UL BWP may be associated with at least one RACH resource. For example, as shown in FIG. 7A, RACH resources # 1 and # 2 may be associated with default DL / UL BWP # 1, and RACH resource # 3 may be associated with default DL / UL BWP # 2. Such association may be used if traffic using the default DL / UL BWP # 1 is not congested.

One RACH resource may be associated with at least one default DL / UL BWP. For example, as shown in FIG. 7B, RACH resource # 1 may be associated with default DL / UL BWP # 1, and RACH resource # 2 may be associated with default DL / UL BWP # 2, # 3. Such association may be used if traffic using RACH resource # 2 is not congested.

According to such association, even when the number of RACH resource candidates is smaller than the number of default DL / UL BWP candidates, it is possible to distribute default DL / UL BWPs of a plurality of UEs.

(Wireless communication system)
Hereinafter, the configuration of the radio communication system according to the present embodiment will be described. In the wireless communication system, the wireless communication method according to each of the above aspects is applied. Note that the wireless communication methods according to the above aspects may be applied singly or in combination.

FIG. 8 is a diagram showing an example of a schematic configuration of a wireless communication system according to the present embodiment. The radio communication system 1 applies carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit are integrated. can do. The wireless communication system 1 may be called SUPER 3G, LTE-A (LTE-Advanced), IMT-Advanced, 4G, 5G, FRA (Future Radio Access), NR (New RAT), or the like.

The radio communication system 1 includes a radio base station 11 forming a macrocell C1, and radio base stations 12a to 12c disposed in the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. Moreover, the user terminal 20 is arrange | positioned at macro cell C1 and each small cell C2. The configuration may be such that different mermorologies are applied between cells. The terminology may be at least one of subcarrier spacing, symbol length, cyclic prefix (CP) length, number of symbols per transmission time interval (TTI), and TTI time length. Also, the slot may be a unit of time based on the terminology applied by the user terminal. The number of symbols per slot may be determined according to the subcarrier spacing.

The user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. The user terminal 20 is assumed to simultaneously use the macro cell C1 and the small cell C2 using different frequencies by CA or DC. Also, the user terminal 20 can apply CA or DC using a plurality of cells (CCs) (for example, two or more CCs). Also, the user terminal can use the license band CC and the unlicensed band CC as a plurality of cells.

In addition, the user terminal 20 can perform communication in each cell (carrier) using time division duplex (TDD) or frequency division duplex (FDD). The TDD cell and the FDD cell may be respectively referred to as a TDD carrier (frame configuration second type), an FDD carrier (frame configuration first type), and the like.

Also, in each cell (carrier), a slot having a relatively long time length (eg, 1 ms) (TTI, normal TTI, long TTI, normal subframe, also referred to as long subframe or subframe, etc.), and / or A slot having a relatively short time length (also referred to as a mini slot, a short TTI or a short subframe, etc.) may be applied. Also, two or more time slots may be applied in each cell.

Communication can be performed between the user terminal 20 and the radio base station 11 using a relatively low frequency band (for example, 2 GHz) and a carrier having a narrow bandwidth (referred to as an existing carrier, Legacy carrier, etc.). On the other hand, between the user terminal 20 and the radio base station 12, a carrier having a wide bandwidth in a relatively high frequency band (for example, 3.5 GHz, 5 GHz, 30 to 70 GHz, etc.) may be used. The same carrier as that for the base station 11 may be used. The configuration of the frequency band used by each wireless base station is not limited to this. In addition, one or more BWPs may be set in the user terminal 20. The BWP consists of at least part of the carrier.

Between the wireless base station 11 and the wireless base station 12 (or between two wireless base stations 12), a wired connection (for example, an optical fiber conforming to a Common Public Radio Interface (CPRI), an X2 interface, etc.) or a wireless connection The configuration may be

The radio base station 11 and each radio base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30. The upper station apparatus 30 includes, for example, an access gateway apparatus, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto. Further, each wireless base station 12 may be connected to the higher station apparatus 30 via the wireless base station 11.

The radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like. Also, the radio base station 12 is a radio base station having local coverage, and is a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), transmission and reception It may be called a point or the like. Hereinafter, when the radio base stations 11 and 12 are not distinguished, they are collectively referred to as the radio base station 10.

Each user terminal 20 is a terminal compatible with various communication schemes such as LTE and LTE-A, and may include not only mobile communication terminals but also fixed communication terminals. Also, the user terminal 20 can perform inter-terminal communication (D2D) with another user terminal 20.

In the radio communication system 1, as the radio access scheme, OFDMA (Orthogonal Frequency Division Multiple Access) can be applied to the downlink (DL), and SC-FDMA (Single Carrier-Frequency Division Multiple Access) is applied to the uplink (UL) it can. OFDMA is a multicarrier transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is mapped to each subcarrier to perform communication. SC-FDMA is a single carrier transmission scheme that divides the system bandwidth into bands consisting of one or continuous resource blocks for each terminal, and a plurality of terminals use different bands to reduce interference between the terminals. is there. The uplink and downlink radio access schemes are not limited to these combinations, and OFDMA may be used in UL. Further, SC-FDMA can be applied to a side link (SL) used for communication between terminals.

In the wireless communication system 1, as DL channels, DL data channels (PDSCH: also referred to as Physical Downlink Shared Channel, DL shared channel etc.) shared by each user terminal 20, broadcast channel (PBCH: Physical Broadcast Channel), L1 / L2 A control channel or the like is used. DL data (at least one of user data, upper layer control information, SIB (System Information Block), etc.) is transmitted by the PDSCH. Also, a MIB (Master Information Block) is transmitted by the PBCH.

The L1 / L2 control channel is a DL control channel (PDCCH (Physical Downlink Control Channel) and / or EPDCCH (Enhanced Physical Downlink Control Channel)), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), etc. including. Downlink control information (DCI) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH. The number of OFDM symbols used for PDCCH is transmitted by PCFICH. The EPDCCH is frequency division multiplexed with the PDSCH, and is used for transmission such as DCI as the PDCCH. The PHICH can transmit PUSCH delivery confirmation information (also referred to as A / N, HARQ-ACK, HARQ-ACK bit, A / N codebook, etc.).

In the radio communication system 1, as a UL channel, a UL data channel shared by each user terminal 20 (PUSCH: also referred to as Physical Uplink Shared Channel, UL shared channel, etc.), UL control channel (PUCCH: Physical Uplink Control Channel), random An access channel (PRACH: Physical Random Access Channel) or the like is used. UL data (user data and / or upper layer control information) is transmitted by the PUSCH. Uplink control information (UCI: Uplink Control Information) including at least one of PDSCH delivery acknowledgment information (A / N, HARQ-ACK) channel state information (CSI) and the like is transmitted by the PUSCH or PUCCH. The PRACH can transmit a random access preamble for establishing a connection with a cell.

<Wireless base station>
FIG. 9 is a diagram showing an example of the entire configuration of the radio base station according to the present embodiment. The radio base station 10 includes a plurality of transmitting and receiving antennas 101, an amplifier unit 102, a transmitting and receiving unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. Each of the transmitting and receiving antenna 101, the amplifier unit 102, and the transmitting and receiving unit 103 may be configured to include one or more. The radio base station 10 may configure a “receiving device” in UL and may configure a “transmitting device” in DL.

User data transmitted from the radio base station 10 to the user terminal 20 by downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.

The baseband signal processing unit 104 performs packet data convergence protocol (PDCP) layer processing, user data division / combination, RLC layer transmission processing such as RLC (Radio Link Control) retransmission control, and MAC (Medium Access) for user data. Control) Retransmission control (for example, processing of HARQ (Hybrid Automatic Repeat reQuest)), scheduling, transmission format selection, channel coding, rate matching, scrambling, Inverse Fast Fourier Transform (IFFT) processing and precoding Transmission processing such as at least one of the processing is performed and transferred to the transmission / reception unit 103. Also, with regard to the downlink control signal, transmission processing such as channel coding and / or inverse fast Fourier transform is performed and transferred to the transmission / reception unit 103.

The transmission / reception unit 103 converts the baseband signal output from the baseband signal processing unit 104 for each antenna into a radio frequency band and transmits the baseband signal. The radio frequency signal frequency-converted by the transmitting and receiving unit 103 is amplified by the amplifier unit 102 and transmitted from the transmitting and receiving antenna 101.

The transmitter / receiver, the transmitting / receiving circuit or the transmitting / receiving device described based on the common recognition in the technical field according to the present invention can be constituted. The transmitting and receiving unit 103 may be configured as an integrated transmitting and receiving unit, or may be configured from a transmitting unit and a receiving unit.

On the other hand, for the UL signal, the radio frequency signal received by the transmitting and receiving antenna 101 is amplified by the amplifier unit 102. The transmitting and receiving unit 103 receives the UL signal amplified by the amplifier unit 102. The transmission / reception unit 103 frequency-converts the received signal into a baseband signal and outputs the result to the baseband signal processing unit 104.

The baseband signal processing unit 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, and error correction on UL data included in the input UL signal. Decoding, reception processing of MAC retransmission control, and reception processing of RLC layer and PDCP layer are performed, and are transferred to the higher station apparatus 30 via the transmission path interface 106. The call processing unit 105 performs at least one of setting of a communication channel, call processing such as release, status management of the radio base station 10, and management of radio resources.

The transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface. Also, the transmission path interface 106 transmits / receives signals (backhaul signaling) to / from the adjacent wireless base station 10 via an inter-base station interface (for example, an optical fiber conforming to CPRI (Common Public Radio Interface), X2 interface). It is also good.

In addition, the transmission / reception unit 103 may be a DL signal (for example, at least one of a DL control signal (also referred to as DL control channel or DCI), a DL data signal (also referred to as DL data channel or DL data), and a reference signal) Send In addition, the transmission / reception unit 103 may be a UL signal (for example, at least one of a UL control signal (also referred to as UL control channel or UCI), a UL data signal (also referred to as UL data channel or UL data), and a reference signal) Receive

Also, the transmission / reception unit 103 may transmit upper layer control information (for example, control information by MAC CE and / or RRC signaling).

FIG. 10 is a diagram showing an example of a functional configuration of a radio base station according to the present embodiment. Note that this figure mainly shows the functional blocks of the characteristic part in the present embodiment, and the wireless base station 10 also has other functional blocks necessary for wireless communication. The baseband signal processing unit 104 includes a control unit 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305.

The control unit 301 controls the entire wireless base station 10. The control unit 301 may, for example, generate a DL signal by the transmission signal generation unit 302, map the DL signal by the mapping unit 303, receive processing (for example, demodulation) of the UL signal by the reception signal processing unit 304, and measure it by the measurement unit 305. Control at least one of Also, the control unit 301 may control scheduling of data channels (including DL data channels and / or UL data channels).

The control unit 301 may control the transmission direction for each symbol in a time unit (for example, slot) which is a scheduling unit of the DL data channel. Specifically, the control unit 301 may control generation and / or transmission of slot format related information (SFI) indicating DL symbols and / or UL symbols in the slot.

The control unit 301 can be configured of a controller, a control circuit, or a control device described based on the common recognition in the technical field according to the present invention.

The transmission signal generation unit 302 generates a DL signal (including at least one of DL data (channel), DCI, DL reference signal, and control information by upper layer signaling) based on an instruction from the control unit 301, It may be output to the mapping unit 303.

The transmission signal generation unit 302 may be a signal generator, a signal generation circuit or a signal generation device described based on the common recognition in the technical field according to the present invention.

The mapping unit 303 maps the DL signal generated by the transmission signal generation unit 302 on a predetermined radio resource based on an instruction from the control unit 301, and outputs the DL signal to the transmission / reception unit 103. For example, the mapping unit 303 maps the reference signal to a predetermined radio resource using the arrangement pattern determined by the control unit 301.

The mapping unit 303 may be a mapper, a mapping circuit or a mapping device described based on the common recognition in the technical field according to the present invention.

The reception signal processing unit 304 performs reception processing (for example, at least one of demapping, demodulation, and decoding) of the UL signal transmitted from the user terminal 20. Specifically, the reception signal processing unit 304 may output the reception signal and / or the signal after reception processing to the measurement unit 305.

The received signal processing unit 304 can be configured from a signal processor, a signal processing circuit or a signal processing device described based on the common recognition in the technical field according to the present invention. Also, the received signal processing unit 304 can constitute a receiving unit according to the present invention.

The measurement unit 305 measures the channel quality of UL based on, for example, received power of a reference signal (for example, reference signal received power (RSRP)) and / or received quality (for example, reference signal received quality (RSRQ)). May be The measurement result may be output to the control unit 301.

Also, the control unit 301 may notify the user terminal 20 of the association of the plurality of radio resources and the plurality of partial bands.

<User terminal>
FIG. 11 is a diagram showing an example of the entire configuration of the user terminal according to the present embodiment. The user terminal 20 includes a plurality of transmission / reception antennas 201 for MIMO transmission, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205. The user terminal 20 may configure a “transmitting device” in UL and may configure a “receiving device” in DL.

The radio frequency signals received by the plurality of transmitting and receiving antennas 201 are amplified by the amplifier unit 202, respectively. Each transmission / reception unit 203 receives the DL signal amplified by the amplifier unit 202. The transmission / reception unit 203 frequency-converts the received signal into a baseband signal and outputs the result to the baseband signal processing unit 204.

The baseband signal processing unit 204 performs at least one of FFT processing, error correction decoding, reception processing of retransmission control, and the like on the input baseband signal. The DL data is transferred to the application unit 205. The application unit 205 performs processing on a layer higher than the physical layer and the MAC layer.

On the other hand, UL data is input from the application unit 205 to the baseband signal processing unit 204. The baseband signal processing unit 204 performs at least one of retransmission control processing (for example, processing of HARQ), channel coding, rate matching, puncturing, discrete Fourier transform (DFT) processing, IFFT processing, and the like. The data is transferred to each transmission / reception unit 203. Also for UCI (eg, A / N of DL signal, channel state information (CSI), scheduling request (SR), etc.), at least one of channel coding, rate matching, puncturing, DFT processing, IFFT processing, etc. Is transferred to each of the transmitting and receiving units 203.

The transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it. The radio frequency signal frequency-converted by the transmitting and receiving unit 203 is amplified by the amplifier unit 202 and transmitted from the transmitting and receiving antenna 201.

In addition, the transmitting / receiving unit 203 is a DL signal (for example, at least one of a DL control signal (also referred to as DL control channel or DCI), a DL data signal (also referred to as DL data channel or DL data), and a reference signal) Receive In addition, the transmission / reception unit 203 is a UL signal (for example, at least one of a UL control signal (also referred to as a UL control channel or UCI), a UL data signal (also referred to as a UL data channel or UL data), and a reference signal) Send

Also, the transmitting / receiving unit 203 may receive upper layer control information (for example, control information by MAC CE and / or RRC signaling).

In addition, the transmitting / receiving unit 203 may transmit a random access preamble using one of a plurality of radio resources (for example, RACH resources) in a random access procedure.

The transmission / reception unit 203 may be a transmitter / receiver, a transmission / reception circuit or a transmission / reception device described based on the common recognition in the technical field according to the present invention. The transmission / reception unit 203 may be configured as an integrated transmission / reception unit, or may be configured from a transmission unit and a reception unit.

FIG. 12 is a diagram showing an example of a functional configuration of the user terminal according to the present embodiment. In addition, in this figure, the functional block of the characteristic part in this Embodiment is mainly shown, and it is assumed that the user terminal 20 also has another functional block required for wireless communication. The baseband signal processing unit 204 included in the user terminal 20 includes a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405.

The control unit 401 controls the entire user terminal 20. The control unit 401 controls, for example, at least one of UL signal generation by the transmission signal generation unit 402, mapping of the UL signal by the mapping unit 403, reception processing of the DL signal by the reception signal processing unit 404, and measurement by the measurement unit 405. Do.

The control unit 401 can be configured of a controller, a control circuit, or a control device described based on the common recognition in the technical field according to the present invention.

Transmission signal generation unit 402 generates retransmission control information of UL signal and DL signal (for example, coding, rate matching, puncturing, modulation, etc.) based on an instruction from control unit 401, and outputs the result to mapping unit 403. Do. The transmission signal generation unit 402 may be a signal generator, a signal generation circuit, or a signal generation device described based on the common recognition in the technical field according to the present invention.

The mapping unit 403 maps retransmission control information of the UL signal and the DL signal generated by the transmission signal generation unit 402 to radio resources based on an instruction from the control unit 401, and outputs the retransmission control information to the transmission / reception unit 203. For example, the mapping unit 403 maps the reference signal to a predetermined radio resource, using the arrangement pattern determined by the control unit 401.

The mapping unit 403 may be a mapper, a mapping circuit or a mapping device described based on the common recognition in the technical field according to the present invention.

The reception signal processing unit 404 performs reception processing (for example, at least one of demapping, demodulation, and decoding) of the DL signal. For example, the reception signal processing unit 404 may demodulate the DL data channel using the reference signal of the arrangement pattern determined by the control unit 401.

Further, the reception signal processing unit 404 may output the reception signal and / or the signal after reception processing to the control unit 401 and / or the measurement unit 405. The reception signal processing unit 404 outputs, for example, upper layer control information by upper layer signaling, L1 / L2 control information (for example, UL grant and / or DL assignment), and the like to the control unit 401.

The received signal processing unit 404 can be composed of a signal processor, a signal processing circuit or a signal processing device described based on the common recognition in the technical field according to the present invention. Also, the received signal processing unit 404 can constitute a receiving unit according to the present invention.

Measuring section 405 measures a channel state based on a reference signal (for example, CSI-RS) from radio base station 10, and outputs the measurement result to control section 401. The channel state measurement may be performed for each CC.

The measuring unit 405 can be configured of a signal processor, a signal processing circuit or a signal processing device, and a measuring instrument, a measuring circuit or a measuring device described based on the common recognition in the technical field according to the present invention.

In addition, the control unit 401 uses the at least one partial band (for example, BWP, default DL / UL BWP) associated with the radio resource (for example, RACH resource) used for the random access preamble, and performs a random access procedure May control the communication of

Also, at least one subband is a subband for downlink (eg, DL BWP, default DL BWP) and a subband for uplink (eg, UL BWP, default UL BWP). It is also good.

Also, the association of radio resources and sub bands may be notified by one of system information (for example, RMSI), message 2 in the random access procedure, and message 4 in the random access procedure. Good.

Also, each of the plurality of radio resources may be at least one of a random access preamble sequence, a random access preamble time resource, and a random access preamble frequency resource.

Also, two or more radio resources of the plurality of radio resources may be associated with at least one partial band.

<Hardware configuration>
The block diagram used for the explanation of the above-mentioned embodiment has shown the block of a functional unit. These functional blocks (components) are realized by any combination of hardware and / or software. Moreover, the implementation means of each functional block is not particularly limited. That is, each functional block may be realized by one physically and / or logically coupled device, or directly and / or indirectly two or more physically and / or logically separated devices. It may be connected by (for example, wired and / or wireless) and realized by the plurality of devices.

For example, the wireless base station, the user terminal, and the like in the present embodiment may function as a computer that performs the process of the wireless communication method of the present invention. FIG. 13 is a diagram showing an example of the hardware configuration of the radio base station and the user terminal according to the present embodiment. The above-described wireless base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007 and the like. Good.

In the following description, the term "device" can be read as a circuit, a device, a unit, or the like. The hardware configuration of the radio base station 10 and the user terminal 20 may be configured to include one or more of the devices illustrated in the figure, or may be configured without including some devices.

For example, although only one processor 1001 is illustrated, there may be a plurality of processors. Also, the processing may be performed by one processor, or the processing may be performed by one or more processors simultaneously, sequentially, or in other manners. The processor 1001 may be implemented by one or more chips.

Each function in the radio base station 10 and the user terminal 20 is performed, for example, by causing a processor 1001 to read predetermined software (program) on hardware such as the processor 1001 and the memory 1002, and the processor 1001 performs an operation. This is realized by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

The processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, the above-described baseband signal processing unit 104 (204), call processing unit 105, and the like may be realized by the processor 1001.

Also, the processor 1001 reads a program (program code), a software module, data, and the like from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processing according to these. As a program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, or may be realized similarly for other functional blocks.

The memory 1002 is a computer readable recording medium, and for example, at least at least a read only memory (ROM), an erasable programmable ROM (EPROM), an electrically EPROM (EEPROM), a random access memory (RAM), or any other suitable storage medium. It may consist of one. The memory 1002 may be called a register, a cache, a main memory (main storage device) or the like. The memory 1002 may store a program (program code), a software module, and the like that can be executed to implement the wireless communication method according to an embodiment of the present invention.

The storage 1003 is a computer readable recording medium, and for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM (Compact Disc ROM), etc.), a digital versatile disk, Blu-ray® disc), removable disc, hard disc drive, smart card, flash memory device (eg card, stick, key drive), magnetic stripe, database, server, at least one other suitable storage medium May be composed of The storage 1003 may be called an auxiliary storage device.

The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, and the like to realize, for example, frequency division duplex (FDD) and / or time division duplex (TDD). It may be configured. For example, the transmission / reception antenna 101 (201), the amplifier unit 102 (202), the transmission / reception unit 103 (203), the transmission path interface 106, and the like described above may be realized by the communication device 1004.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, and the like) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

Also, each device in the radio base station 10 and the user terminal 20 is connected by a bus 1007 for communicating information. The bus 1007 may be configured by a single bus or may be configured by different buses among the devices.

Also, the radio base station 10 and the user terminal 20 may be microprocessors, digital signal processors (DSPs), application specific integrated circuits (ASICs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), etc. It may be configured to include hardware, and part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented in at least one of these hardware.

(Modification)
The terms described in the present specification and / or the terms necessary for the understanding of the present specification may be replaced with terms having the same or similar meanings. For example, the channels and / or symbols may be signaling. Also, the signal may be a message. The reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot (Pilot), a pilot signal or the like according to an applied standard. Also, a component carrier (CC: Component Carrier) may be called a cell, a frequency carrier, a carrier frequency or the like.

Also, a radio frame may be configured with one or more periods (frames) in the time domain. Each of the one or more periods (frames) that constitute a radio frame may be referred to as a subframe. Furthermore, a subframe may be configured with one or more slots in the time domain. The subframes may be of a fixed time length (e.g., 1 ms) independent of the neurology.

A slot may be configured with one or more symbols (such as orthogonal frequency division multiplexing (OFDM) symbols, single carrier frequency division multiple access (SC-FDMA) symbols, etc.) in the time domain. Also, the slot may be a time unit based on the neurology. Also, the slot may include a plurality of minislots. Each minislot may be comprised of one or more symbols in the time domain.

A radio frame, a subframe, a slot, a minislot and a symbol all represent time units when transmitting a signal. For radio frames, subframes, slots, minislots and symbols, other names corresponding to each may be used. For example, one subframe may be referred to as a transmission time interval (TTI), a plurality of consecutive subframes may be referred to as a TTI, and one slot or one minislot may be referred to as a TTI. May be That is, the subframe and / or TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. It may be.

Here, TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the radio base station performs scheduling to allocate radio resources (such as frequency bandwidth and / or transmission power that can be used in each user terminal) to each user terminal on a TTI basis. Note that the definition of TTI is not limited to this. The TTI may be a transmission time unit of a channel coded data packet (transport block) or may be a processing unit such as scheduling and / or link adaptation. If one slot or one minislot is referred to as TTI, one or more TTIs (ie, one or more slots or one or more minislots) may be the minimum time unit of scheduling. In addition, the number of slots (the number of minislots) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, or the like. A TTI shorter than a normal TTI may be referred to as a short TTI, a short TTI, a partial TTI (partial or fractional TTI), a short subframe, a short subframe, or the like.

A resource block (RB: Resource Block) is a resource allocation unit in time domain and frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain. Also, an RB may include one or more symbols in the time domain, and may be one slot, one minislot, one subframe, or one TTI in length. One TTI and one subframe may be configured of one or more resource blocks, respectively. The RB may be called a physical resource block (PRB: Physical RB), a PRB pair, an RB pair, or the like.

Also, a resource block may be composed of one or more resource elements (RE: Resource Element). For example, one RE may be one subcarrier and one symbol radio resource region.

The above-described structures such as the radio frame, subframe, slot, minislot and symbol are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols included in a slot or minislot, and subcarriers included in an RB And the number of symbols in TTI, symbol length, cyclic prefix (CP) length, and other configurations may be variously changed.

In addition, the information, parameters, and the like described in the present specification may be represented by absolute values, may be represented by relative values from predetermined values, or may be represented by corresponding other information. . For example, the radio resources may be indicated by a predetermined index. Furthermore, the formulas etc. that use these parameters may differ from those explicitly disclosed herein.

The names used for parameters and the like in the present specification are not limited in any respect. For example, since various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements can be identified by any suitable names, various assignments are made to these various channels and information elements. The name is not limited in any way.

The information, signals, etc. described herein may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips etc that may be mentioned throughout the above description may be voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any of these May be represented by a combination of

Also, information, signals, etc. may be output from the upper layer to the lower layer and / or from the lower layer to the upper layer. Information, signals, etc. may be input / output via a plurality of network nodes.

The input / output information, signals and the like may be stored in a specific place (for example, a memory) or may be managed by a management table. Information, signals, etc. input and output can be overwritten, updated or added. The output information, signals and the like may be deleted. The input information, signals and the like may be transmitted to other devices.

The notification of information is not limited to the aspects / embodiments described herein, and may be performed in other manners. For example, notification of information may be physical layer signaling (eg, downlink control information (DCI), uplink control information (UCI)), upper layer signaling (eg, RRC (Radio Resource Control) signaling, It may be implemented by broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), MAC (Medium Access Control) signaling, other signals, or a combination thereof.

The physical layer signaling may be called L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), or the like. Also, RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like. Also, MAC signaling may be notified by, for example, a MAC control element (MAC CE (Control Element)).

In addition, notification of predetermined information (for example, notification of "it is X") is not limited to what is explicitly performed, but implicitly (for example, by not notifying the predetermined information or another It may be performed by notification of information.

The determination may be performed by a value (0 or 1) represented by one bit, or may be performed by a boolean value represented by true or false. , Numerical comparison (for example, comparison with a predetermined value) may be performed.

Software may be called software, firmware, middleware, microcode, hardware description language, or any other name, and may be instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules. Should be interpreted broadly to mean applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc.

Also, software, instructions, information, etc. may be sent and received via a transmission medium. For example, software may use a wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and / or a wireless technology (infrared, microwave, etc.), a website, a server These or other wired and / or wireless technologies are included within the definition of the transmission medium, as transmitted from a remote source, or other remote source.

The terms "system" and "network" as used herein are used interchangeably.

In this specification, “base station (BS: Base Station)”, “radio base station”, “eNB”, “gNB”, “cell”, “sector”, “cell group”, “carrier” and “component carrier” The term "can be used interchangeably. A base station may also be called in terms of a fixed station (Node station), NodeB, eNodeB (eNB), access point (access point), transmission point, reception point, femtocell, small cell, and so on.

A base station may accommodate one or more (e.g., three) cells (also called sectors). If the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, a small base station for indoor use (RRH: Communication services may also be provided by the Remote Radio Head, where the term "cell" or "sector" refers to part or all of the coverage area of a base station and / or a base station subsystem serving communication services in this coverage. Point to.

As used herein, the terms "mobile station (MS)," user terminal, "" user equipment (UE) "and" terminal "may be used interchangeably. A base station may also be called in terms of a fixed station (Node station), NodeB, eNodeB (eNB), access point (access point), transmission point, reception point, femtocell, small cell, and so on.

The mobile station may be a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, by those skilled in the art. It may also be called a terminal, a remote terminal, a handset, a user agent, a mobile client, a client or some other suitable term.

Also, the radio base station in the present specification may be replaced with a user terminal. For example, each aspect / embodiment of the present invention may be applied to a configuration in which communication between a wireless base station and a user terminal is replaced with communication between a plurality of user terminals (D2D: Device-to-Device). In this case, the user terminal 20 may have a function that the above-described radio base station 10 has. Also, “up” and / or “down” may be read as “side”. For example, the upstream channel may be read as a side channel.

Similarly, a user terminal herein may be read at a radio base station. In this case, the radio base station 10 may have a function that the above-described user terminal 20 has.

In this specification, the specific operation to be performed by the base station may be performed by the upper node in some cases. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be a base station, one or more network nodes other than the base station (eg, It is apparent that this can be performed by MME (Mobility Management Entity), S-GW (Serving-Gateway), etc. but not limited thereto or a combination thereof.

Each aspect / embodiment described in this specification may be used alone, may be used in combination, and may be switched and used along with execution. Moreover, as long as there is no contradiction, you may replace the order of the processing procedure of each aspect / embodiment, sequence, flowchart, etc. which were demonstrated in this specification. For example, for the methods described herein, elements of the various steps are presented in an exemplary order and are not limited to the particular order presented.

Each aspect / embodiment described in the present specification includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile) Communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (registered trademark) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802 .20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), The present invention may be applied to a system utilizing another appropriate wireless communication method of and / or an extended next generation system based on these.

As used herein, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

Any reference to an element using the designation "first," "second," etc. as used herein does not generally limit the quantity or order of those elements. These designations may be used herein as a convenient way of distinguishing between two or more elements. Thus, reference to the first and second elements does not mean that only two elements can be taken or that the first element must somehow precede the second element.

The term "determining" as used herein may encompass a wide variety of operations. For example, “determination” may be calculating, computing, processing, deriving, investigating, looking up (eg, table, database or other data) A search on structure), ascertaining, etc. may be considered as "determining". Also, "determination" may be receiving (e.g. receiving information), transmitting (e.g. transmitting information), input (input), output (output), access (access) It may be considered as "determining" (eg, accessing data in memory) and the like. Also, “determination” is considered to be “determination” to resolve, select, choose, choose, establish, compare, etc. It is also good. That is, "determination" may be considered as "determining" some action.

As used herein, the terms "connected", "coupled", or any variation thereof are any direct or indirect connection between two or more elements or It means a bond and can include the presence of one or more intermediate elements between two elements "connected" or "connected" to each other. The coupling or connection between elements may be physical, logical or a combination thereof. As used herein, the two elements are by using one or more wires, cables and / or printed electrical connections, and radio frequency as some non-limiting and non-exclusive examples. It can be considered "connected" or "coupled" to one another by using electromagnetic energy such as electromagnetic energy having wavelengths in the region, microwave region and light (both visible and invisible) regions.

When the terms "including", "comprising" and variations thereof are used in the specification or in the claims, these terms as well as the term "comprising" are inclusive. It is intended to be. Further, it is intended that the term "or" as used herein or in the claims is not an exclusive OR.

Although the present invention has been described above in detail, it is apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modifications and changes without departing from the spirit and scope of the present invention defined by the description of the claims. Accordingly, the description in the present specification is for the purpose of illustration and does not have any limiting meaning on the present invention.

Claims

A transmitter configured to transmit a random access preamble using one of a plurality of radio resources in a random access procedure;
A control unit configured to control communication in the random access procedure using at least one partial band associated with the used radio resource.
The user terminal according to claim 1, wherein the at least one partial band is a partial band for downlink and a partial band for uplink.
An association of the plurality of radio resources and the plurality of partial bands is notified by one of system information, a message 2 in the random access procedure, and a message 4 in the random access procedure. The user terminal according to claim 1 or claim 2.
Each of the plurality of radio resources is at least one of a sequence of the random access preamble, a time resource of the random access preamble, and a frequency resource of the random access preamble. The user terminal according to any one of claims 3.
The user terminal according to any one of claims 1 to 4, wherein two or more radio resources among the plurality of radio resources are associated with the at least one partial band.
Transmitting a random access preamble using one of a plurality of radio resources in a random access procedure;
Controlling communication in the random access procedure using at least one partial band associated with the used radio resource.