WO2019030930A1 - User terminal and radio communication method - Google Patents

Abstract

The present invention allows the activation/deactivation of one or more frequency bands (for example, a BWP) that are set within a carrier to be properly controlled. A user terminal according to the present invention is provided with: a reception unit that monitors a control resource region, said control resource region being set to a first downlink (DL) frequency band within a carrier, and receives downlink control information (DCI); and a control unit that controls the activation of a second DL frequency band within the carrier on the basis of the DCI.

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 ( Also referred to as New RAT), LTE Rel. 14, 15 and so on.

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)).

In the future wireless communication system, one or more frequency bands (for example, bandwidth part (BWP)) in a carrier (also referred to as a component carrier (CC) or a system band) may be It is considered to use for DL and / or UL communication (DL / UL communication).

As described above, when one or more frequency bands (for example, BWP) used for DL / UL communication can be set in the carrier, the processing load on the user terminal (for example, the processing load due to blind decoding for each frequency band) In order to reduce, it is desirable to appropriately control the activation and / or deactivation (activation / deactivation) of the frequency band.

The present invention has been made in view of such a point, and provides a user terminal and a wireless communication method capable of appropriately controlling activation / deactivation of one or more frequency bands (for example, BWP) set in a carrier. One purpose is to provide.

One aspect of a user terminal of the present invention monitors a control resource area set in a first downlink (DL) frequency band in a carrier, and receives a downlink control information (DCI); And a controller configured to control activation of a second DL frequency band in the carrier based on the DCI.

According to the present invention, activation / deactivation of one or more frequency bands (for example, BWPs) set in a carrier can be appropriately controlled.

1A and 1B are diagrams showing an example of setting of BWP. It is a figure which shows an example of the 1st activation control which concerns on a 1st aspect. It is a figure which shows an example of the 1st fallback mechanism which concerns on a 1st aspect. It is a figure which shows an example of the 2nd fallback mechanism which concerns on a 1st aspect. It is a figure which shows an example of the 2nd activation control which concerns on a 1st aspect. It is a figure which shows an example of the 3rd activation control which concerns on a 1st aspect. 7A and 7B are diagrams showing an example of deactivation control according to the first aspect. It is a figure which shows an example of the setting of UL BWP which concerns on a 3rd aspect. It is a figure which shows the other example of the setting of UL BWP which concerns on a 3rd aspect. It is a figure which shows an example of transmission of UL signal in each UL BWP which concerns on a 3rd aspect. It is a figure which shows an example of activation / deactivation control of UL BWP which concerns on a 3rd 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 system (for example, NR, 5G or 5G +), a carrier (component carrier (CC: Component: Carrier) with a wider bandwidth (for example, 100 to 400 MHz) than an existing LTE system (for example, LTE Rel. 8-13) It is considered to allocate a carrier) or a system band etc.). If the user terminal always uses the entire carrier, power consumption may be enormous. For this reason, in the future wireless communication systems, it is considered to configure one or more frequency bands in the carrier in a quasi-static manner for the user terminal. Each frequency band in the carrier is also referred to as a bandwidth part (BWP) or a partial band or the like.

FIG. 1 is a diagram showing an example of setting of the BWP. As shown in FIG. 1A, one BWP may be set per carrier for the user terminal.

Also, as shown in FIG. 1B, a plurality of BWPs (here, 2 BWPs # 1 and # 2) may be set per carrier for the user terminal. As shown in FIG. 1B, a plurality of BWPs configured in a user terminal may have different bandwidths. In addition, at least part of the frequency bands may overlap among the plurality of BWPs. For example, in FIG. 1B, BWP # 1 is a partial frequency band of BWP # 2.

Also, the user terminal may control activation / deactivation of at least one BWP. The activation of the BWP means that the BWP is available (or transits to the available state), and the BWP configuration information (configuration) (BWP configuration information) is activated or validated, etc. Also called. 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.

In addition, one BWP (for example, BWP # 1 in FIG. 1B) set to the user terminal is always kept active, and activation or non-activation of another BWP (s) (for example, BWP # 2 in FIG. 1B). Activation may be controlled. Alternatively, activation or deactivation of all BWPs (for example, both BWPs # 1 and # 2 in FIG. 1B) set in the user terminal may be controlled.

BWP activation / deactivation uses at least one of physical layer signaling (for example, DCI), MAC (Medium Access Control) signaling (for example, MAC control element (MAC CE: MAC Control Element)), and RRC signaling. It may be done explicitly or implicitly. For example, it is considered to activate BWP using RRC signaling of user terminal dedicated (dedicated).

Alternatively, it is considered that DCI explicitly or implicitly indicate BWP activation or deactivation. The DCI may be DCI (DL assignment and / or UL grant) used for scheduling of a data channel for the user terminal, or another DCI (for example, DCI common to one or more user terminals ( It may be a group DCI or a common DCI)).

In the explicit indication, indication information indicating activation or deactivation may be included in the DCI. In an implicit indication, the presence of DCI (e.g., DL assignment and / or UL grant) may itself indicate BWP activation or deactivation.

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 (for example, DL BWPs included in the primary CC) includes a control resource region that is a candidate for assignment of 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 (eg, RRC signaling or SIB). The CORESET setting information includes frequency resources (eg, number of RBs), time resources (eg, starting OFDM symbol number), durations (duration), REG (Resource Element Group) bundle size (REG size), transmission type (eg, number of RBs) of each CORESET. For example, at least one of interleaving, non-interleaving), and a cycle (for example, a monitoring cycle every CORESET) may be indicated.

As described above, when one or more BWPs used for DL / UL communication can be set in the carrier, various control methods of activation / deactivation of at least one BWP are under study. However, it is desirable to control the activation / deactivation of the at least one BWP more simply and / or with higher processing efficiency.

Therefore, the present inventors examined a method of controlling activation / deactivation of at least one BWP set in a user terminal more simply and / or with higher processing efficiency, and reached the present invention. In the following first aspect, control of activation / deactivation of at least one DL BWP set in a user terminal will be mainly described. In the second aspect, setting of BWP (DL BWP and / or UL BWP) will be mainly described. In the third aspect, control of activation / deactivation of at least one UL BWP set in a user terminal will be mainly described.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In addition, although the slot format of 1 slot is illustrated below, it is applicable suitably also to the slot format of a several slot.

(First aspect)
In the first aspect, the user terminal monitors (blind decode) CORESET (first control resource region) set in DL BWP # 1 (first frequency band) in the carrier at a predetermined cycle, and performs DCI Receive The user terminal controls activation or deactivation of DL BWP # 2 (second frequency band) in the carrier based on the DCI.

<First activation control>
In the first activation control, the user terminal monitors a single CORESET set in a certain DL BWP (for example, DL BWP # 1) in the carrier at a predetermined cycle, and DCI and / or / for the DL BWP. Alternatively, DCI for another DL BWP (s) (for example, DL BWP # 2) in the carrier may be received (detected).

The DCI for DL BWP # 2 is used to schedule PDSCH (DL data channel) for frequency resources in DL BWP # 2. The user terminal activates DL BWP # 2 based on the DCI for the DL BWP # 2. Also, the user terminal controls the reception of PDSCH based on the DCI in the activated DL BWP # 2.

FIG. 2 is a diagram showing an example of first activation control according to the first aspect. For example, in FIG. 2, as shown in FIG. 1B, it is assumed that two DL BWPs # 1 and # 2 are set in the carrier set in the user terminal. Also, it is assumed that DL BWP # 1 is a part of the frequency band of DL BWP # 2.

Further, in FIG. 2, it is assumed that CORESET # 1 is set in DL BWP # 1 and CORESET # 2 is set in DL BWP # 2. Each of CORESET # 1 and CORESET # 2 is provided with one or more search spaces. For example, in CORESET # 1, DCI for DL BWP # 1 and DCI for DL BWP # 2 may be arranged in different search spaces.

Further, in FIG. 2, when DL BWP # 1 is in the active state, the user terminal can perform 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 DCI for DL BWP # 1 and the DCI for DL BWP # 2 are monitored (blind decoding).

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

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

In FIG. 2, DCI for DL BWP # 1 and DCI for DL BWP # 2 are detected at different timings in CORESET # 1, but multiple 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 DL BWP # 2 is activated, the user terminal can transmit DL BWP # 2 within CORESET # 2 in a predetermined cycle (eg, every one or more slots, every one or more minislots, or every predetermined number of symbols). Monitor the DCI for (blind decoding). The user terminal may receive the PDSCH scheduled to a predetermined time / frequency resource of DL BWP # 2 based on the DCI for DL BWP # 2 detected at CORESET # 2.

Although DL BWP # 1 is assumed to be deactivated when DL BWP # 2 is activated in FIG. 2, DL BWP # 1 may be kept active. Further, 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 DL BWP # 2 is activated triggered by detection of DCI for DL BWP # 2 in CO BRESET of DL BWP # 1, DL BWP # 2 is not provided without explicit indication information. Since the activation can be performed, it is possible to prevent an increase in overhead associated with activation control.

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

In this case, when the radio base station can not receive 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 activates DL BWP # 2. It may be recognized that the detection of the DCI for the above has failed, and CORESET # 1 may retransmit the DCI for activation. However, this method may reduce the utilization efficiency of radio resources.

Therefore, a fallback mechanism may be introduced in order to resolve early recognition mismatch of the active BWP between the radio base station and the user terminal. Here, the fallback mechanism is to provide a common CORESET to one or more BWPs (first fallback mechanism) or to maintain a single activated BWP (second fallback mechanism ) May be.

«First fallback mechanism»
In the first fallback mechanism, CORESET common to one or more BWPs set in the user terminal is set, and activation or deactivation of each BWP is controlled.

FIG. 3 is a diagram showing an example of a first fallback mechanism according to the first aspect. In FIG. 3, differences from FIG. 2 will be mainly described. In FIG. 3, CORESET common to one or more BWPs (here, DL BWPs # 1 and # 2) (also referred to as BWP-common CORESET or common CORESET etc.) and CORESET (BWP- specific to each BWP) It differs from FIG. 2 in that a specific CORESET or a specific CORESET or the like is provided.

As shown in FIG. 3, the BWP-common CORESET is set to the same frequency band (the same one or more PRBs) between the DL BWPs # 1 and # 2. On the other hand, BWP-specific CORESET may be set to different bandwidths (different number of PRBs) and / or different frequency bands (different one or more PRBs) for each BWP.

For example, in FIG. 3, since DL BWP # 2 has a wider bandwidth than DL BWP # 1, the CO RESET specific to DL BWP # 2 is configured with a larger number of PRBs than the CORESET specific to DL BWP # 1. May be

In BWP-Common CORESET, explicit or implicit indication information for activation of other BWPs (here, DL BWP # 2) may be sent. For example, in BWP-common CORESET in FIG. 3, DCI (DL assignment) for DL BWP # 2 for scheduling the PDSCH of DL BWP # 2 is transmitted as implicit instruction information.

In addition, when the BWP-common CORESET is used as a common search space, in the BWP-common CORESET, system information (also referred to as SI: System Information, SIB: System Information Block, etc.) and / or random access response (RAR: Random Access) Control information for transmitting a response or the like may be transmitted.

On the other hand, in each BWP specific-CORESET, DCI for each BWP may be transmitted. For example, in CO RESET specific to DL BWP # 1, DL assignment for scheduling the PDSCH of DL BWP # 1 may be transmitted. Moreover, in CO RESET specific to DL BWP # 2, DL assignment for scheduling the PDSCH of DL BWP # 2 may be transmitted.

In FIG. 3, regardless of which BWP is activated, the user terminal performs BWP-common CORESET in a predetermined cycle (for example, every one or more slots, every one or more minislots, or each predetermined number of symbols). Monitor For example, in FIG. 3, the user terminal activates DL BWP # 2 and deactivates DL BWP # 1 based on DCI for DL BWP # 2 detected by BWP-common CORESET. The user terminal receives the PDSCH scheduled in the DL BWP # 2 based on the DCI for the DL BWP # 2.

Also, the user terminal monitors CORESET specific to the activated BWP at a predetermined cycle. For example, in FIG. 3, when DL BWP # 1 is activated, the user terminal monitors CO BRESET specific to DL BWP # 1 at a predetermined cycle. The user terminal receives the PDSCH scheduled in the DL BWP # 1 based on the DCI for the DL BWP # 1 detected by the CO RESET specific to the DL BWP # 1.

On the other hand, when DL BWP # 2 is activated, the user terminal monitors CO RESET specific to DL BWP # 2 at a predetermined cycle. The user terminal receives the PDSCH scheduled in the DL BWP # 2 based on the DCI for the DL BWP # 2 detected by the CO RESET specific to the DL BWP # 2.

In the first fallback mechanism, regardless of which BWP is activated, the user terminal continues to monitor BWP-common CORESET at predetermined intervals. For this reason, even if the user terminal fails to detect DCI for DL BWP # 2 with BWP-common CORESET at a certain timing, based on DCI for DL BWP # 2 detected with subsequent BWP-common CORESET. , DL BWP # 2 can be activated. Therefore, it is possible to resolve early on the mismatch in recognition of the active BWP between the wireless base station and the user terminal.

«Second fallback mechanism»
In the second fallback mechanism, a single BWP is kept active and the activation or deactivation of other BWPs is controlled.

BWPs that are kept active are also called active BWPs, primary BWPs, and the like. In addition, one or more BWPs whose activation or deactivation is controlled are also called secondary BWPs and the like. In addition, when single BWP is set in a carrier (for example, FIG. 1A), primary BWP is set and secondary BWP is not set.

A common search space and UE-specific search space may be set in the primary BWP. On the other hand, a common search space may not be set in the secondary BWP, and a UE-specific search space may be set.

The user terminal monitors the common search space of the primary BWP in a predetermined cycle. Also, the user terminal monitors UL grants in the primary BWP's UE-specific search space at predetermined intervals. On the other hand, the user terminal may monitor the DL assignment in a predetermined cycle in the UE-specific search space of the primary BWP, or may stop monitoring the DL assignment if a predetermined condition is satisfied. .

For example, when the secondary BWP is configured and the secondary BWP is activated, the user terminal monitors DL assignment in the UE-specific search space of the secondary BWP, and performs DL assignment in the UE-specific search space of the primary BWP. It is not necessary to monitor.

FIG. 4 is a diagram showing an example of a second fallback mechanism according to the first aspect. In FIG. 4, differences from FIG. 2 will be mainly described. FIG. 4 differs from FIG. 2 in that DL BWP # 1 which is a primary BWP is maintained active, and activation or deactivation of DL BWP # 2 which is a secondary BWP is controlled.

In FIG. 4, CORESET # 1 may be set in DL BWP # 1, and CORESET # 2 may be set in DL BWP # 2. CORESET # 1 may include a common search space and a UE-specific search space. On the other hand, CORESET # 2 may not include the common search space but may include the UE-specific search space.

In FIG. 4, the user terminal activates DL BWP # 2 based on DCI (DL assignment) for DL BWP # 2 detected in the common search space of CORESET # 1. The user terminal receives the PDSCH scheduled in the DL BWP # 2 based on the DCI for the DL BWP # 2.

Also, the user terminal receives the PDSCH scheduled in the DL BWP # 1 based on the DCI (DL assignment) for the DL BWP # 1 detected in the UE-specific search space of CORESET # 1.

When DL BWP # 2 is activated, the user terminal monitors the UE-specific search space of CORESET # 2 at a predetermined cycle. The user terminal receives the PDSCH scheduled in the DL BWP # 2 based on the DCI (DL assignment) for the DL BWP # 2 detected in the UE-specific search space.

In addition, even if DL BWP # 2 is activated, the user terminal monitors the common search space of CORESET # 1 at a predetermined cycle. On the other hand, when DL BWP # 2 is activated, the user terminal monitors the UL grant in a predetermined cycle in the UE-specific search space of CORESET # 1 while monitoring the DL assignment in the UE-specific search space of CORESET # 1. You don't have to.

In the second fallback mechanism, the user terminal keeps monitoring the common search space of CORESET # 1 of the primary BWP regardless of whether the secondary BWP is activated. Therefore, even if the user terminal fails to detect the DCI for DL BWP # 2 at CORESET # 1 at a certain timing, the DL is generated based on the DCI for DL BWP # 2 detected in the subsequent CORESET # 1. BWP # 2 can be activated. Therefore, it is possible to resolve early on the mismatch in recognition of the active BWP between the wireless base station and the user terminal.

<Second activation control>
In the second activation control, the user terminal monitors CORESET for each BWP set in a certain DL BWP (for example, DL DL BWP # 1) in the carrier at a predetermined cycle. The user terminal may receive (detect) the DCI for the corresponding BWP in each CORESET. The second activation control is different from the first activation control in that a plurality of CORESETs corresponding to a plurality of BWPs are set to a specific DL BWP. Hereinafter, differences from the first activation control will be mainly described.

In the second activation control, when one or more BWPs (one or more DL BWPs and / or one or more UL BWPs) are set in the user terminal, each of the one or more DL BWPs is included in at least one DL BWP. There may be provided one or more CORESETs corresponding to.

FIG. 5 is a diagram showing an example of second activation control according to the first aspect. In FIG. 5, differences from FIG. 2 will be mainly described. In FIG. 5, FIG. 2 is different from FIG. 2 in that the DL BWP # 1 is provided with CORESET # 1 to which DCI for DL BWP # 1 is transmitted and CORESET # 2 to which DCI for DL BWP # 2 is transmitted. It is different.

In FIG. 5, when DL BWP # 1 is activated and DL BWP # 2 is deactivated, the user terminal has a predetermined cycle of CORESET # 1 and CORESET # 2 set in DL BWP # 1. To monitor. The monitoring cycle of CORESET # 1 and CORESET # 2 may be identical or different.

The user terminal receives the PDSCH scheduled to the DL BWP # 1 based on the DCI for the DL BWP # 1 detected by the CORESET # 1 of the DL BWP # 1.

Also, when the DCI for DL BWP # 2 is detected in CORESET # 2 of DL BWP # 1, the user terminal activates DL BWP # 2 and deactivates DL BWP # 1. The user terminal receives the PDSCH scheduled to the DL BWP # 2 based on the DCI for the DL BWP # 2 detected by the CORESET # 2 of the DL BWP # 1.

Further, in FIG. 5, when DL BWP # 1 is deactivated and DL BWP # 2 is activated, the user terminal monitors CORESET # 2 set in DL BWP # 2 at a predetermined cycle. Do. The user terminal receives the PDSCH scheduled to the DL BWP # 2 based on the DCI for the DL BWP # 2 detected by the CORESET # 2 of the DL BWP # 2.

Also in the second activation control, the first fallback mechanism or the second fallback mechanism is applied in order to eliminate early recognition mismatch of the active BWP between the radio base station and the user terminal. May be

In the second activation control described above, a plurality of CORESETs corresponding to each of a plurality of BWPs set in the user terminal are set in a certain DL BWP. Then, resources of CORESET # 2) can be used for PDSCH resources.

<Third activation control>
In the third activation control, the user terminal monitors CORESET set in a certain DL BWP (for example, DL BWP # 1) in the carrier at a predetermined cycle, and the other DL BWP (s) (for example, DL) A DCI for activation of BWP # 2) may be received (detected).

The DCI for activation indicates activation of another DL BWP. For example, the DCI may be DCI (DL assignment or UL grant) for scheduling, or DCI in a dedicated format. In the case of DCI for scheduling, a specific value (for example, 0) may be set in the resource assignment field in the DCI. The DCI for activation may include the index (BWP index) of the BWP to be activated.

FIG. 6 is a diagram showing an example of third activation control according to the first aspect. In FIG. 6, differences from FIG. 2 will be mainly described. 6 differs from FIG. 2 in that DCI for activation of DL BWP # 2 is used to explicitly instruct activation of DL BWP # 2.

In FIG. 6, when the DL BWP # 1 is activated and the DL BWP # 2 is deactivated, the user terminal has a predetermined period of CORESET # 1 set to the DL BWP # 1. To monitor. The user terminal activates DL BWP # 2 when a DCI for activation is detected in CORESET # 1.

In FIG. 6, when the DL BWP # 2 is activated, the user terminal starts monitoring of a predetermined period of CORESET # 2 of the DL BWP # 2. The user terminal receives the PDSCH scheduled to the DL BWP # 2 based on the DCI for the DL BWP # 2 detected by the CORESET # 2 of the DL BWP # 2.

When the user terminal succeeds in detecting the DCI for activation, the user terminal may transmit an ACK (Acknowledge) to the radio base station. For example, the user terminal may transmit the ACK using a UL BWP UL control channel (eg, PUCCH) or a UL data channel (eg, PUSCH). The radio base station may start scheduling of the PDSCH in DL BWP # 2 after receiving the ACK from the user terminal.

Alternatively, the radio base station may start scheduling of the PDSCH in DL BWP # 2 with CORESET # 2 without receiving an ACK from the user terminal. In this case, since the user terminal continues to monitor CORESET # 1, it can not detect DCI for DL BWP # 2 scheduling PDSCH in DL BWP # 2. Thus, the radio base station may recognize in DTX a failure in detection of DCI for activation at the user terminal.

In the third activation control described above, activation of the DL BWP is explicitly instructed. Therefore, if an ACK for that is transmitted, activation can be appropriately performed without unnecessarily transmitting PDSCH. In the third activation control, the first fallback mechanism or the second fallback mechanism may be applied.

<Deactivation control>
The DL BWP activated by the first to third activation controls may be deactivated using explicit deactivation indication information or a timer.

«When using explicit instruction information»
The explicit deactivation indication information (deactivation indication information) may be MAC CE or DCI. The DCI may be DCI for scheduling (DL assignment or UL grant), or DCI in a dedicated format. In the case of DCI for scheduling, a specific value (for example, 0) may be set in the resource assignment field in the DCI. The DCI may include the index of the BWP to be deactivated.

When using explicit indication information, BWP can be deactivated earlier than when using a timer.

<< When using a timer >>
The user terminal may deactivate the BWP if the data channel (eg, PDSCH and / or PUSCH) is not scheduled for a predetermined period of time in the activated BWP (DL BWP and / or UL BWP). For example, in FIGS. 2 to 6, the user terminal deactivates DL BWP # 2 because PDSCH is not scheduled for a predetermined period in DL BWP # 2. Also, in FIGS. 2, 3, 5 and 6, the user terminal deactivates DL BWP # 2 and activates DL BWP # 1.

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 for DL BWP (DL timer) and a timer for UL BWP (UL timer) are separately provided, a predetermined period until the DL timer expires includes a DL symbol and a UL symbol is included. It is not necessary. Similarly, the predetermined period until the UL timer expires may include the UL symbol and may not include the DL symbol.

Also, if the DL timer and the UL timer are provided separately, the UL BWP may be deactivated as soon as the UL timer expires, or may be deactivated waiting for the DL timer to expire. . Similarly, the DL BWP may be deactivated as soon as the DL timer expires, or may be deactivated waiting for the expiration of the UL timer.

FIG. 7 is a diagram showing an example of deactivation control according to the first aspect. In FIG. 7, it is assumed that DL BWP # 1 (primary BWP) is maintained active, and DL BWP # 2 (secondary BWP) and UL BWP transition from active to inactive.

As shown in FIG. 7A, if there is UL data (PUSCH) in UL BWP, and DL timer expires earlier than UL timer, DL BWP # 2 may be deactivated according to DL timer expiration. Good. It is because UL grant which schedules UL data to UL BWP is transmitted by DL BWP # 1.

On the other hand, if there is DL data (PDSCH) in DL BWP # 2 and there is no UL data (PUSCH), the UL timer may expire earlier than the DL timer if the UL timer is set when the UL data is lost. There is. In this case, when the UL BWP is deactivated in response to the expiration of the UL timer, there is a possibility that the feedback signal (for example, ACK / NACK of DL data) can not be fed back. Therefore, as shown in FIG. 7B, the UL timer may be reset when the feedback signal is generated.

When a timer is used, it is not necessary to transmit explicit deactivation instruction information, so the overhead associated with controlling deactivation can be reduced.

(Second aspect)
In the second aspect, BWP configuration (configuration) and configuration information (BWP configuration information) will be described.

The maximum bandwidth of one or more BWPs (DL BWPs and / or UL BWPs) configured for the user terminal may be determined based on the category of the user terminal reported by the user terminal. For example, if the category reported from the user terminal supports 100 MHz, the maximum bandwidth of at least one BWP set in the user terminal may be 100 MHz.

The minimum bandwidth of one or more BWPs configured for the user terminal may be the minimum bandwidth (for example, 5 MHz) supported by user terminals of any category.

If BWP is not set in the user terminal, the user terminal may monitor the entire carrier.

Also, the BWP may be associated with a particular nucleus (eg, at least one of subcarrier spacing, symbol length, cyclic prefix (CP) length, number of symbols in a slot (or minislot), etc.) . For example, as shown in FIG. 1B, when a plurality of BWPs are set in a user terminal, the same and / or different neurology may be used among the plurality of BWPs.

In addition, BWP setting information is information indicating a neurology (for example, subcarrier interval), information indicating a frequency position (for example, center frequency), bandwidth (for example, resource block (RB (Resource Block), PRB (Physical)). At least information such as the number of RBs), information indicating the number of time resources (for example, the number of symbols per slot (minislot)), information indicating the number of layers of MIMO, information on Quasi-Co-Location, etc. It may include one.

The user terminal performs BWP using higher layer signaling (for example, RRC signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.) and / or MAC signaling). Configuration information may be received.

In addition, when a plurality of BWPs are set in the user terminal and different slot types (for example, the number of symbols and / or the neurology etc.) are applied among the plurality of BWPs, scheduling of other BWPs in a specific BWP Performing cross-BWP scheduling may not be supported. On the other hand, when the same slot type is applied among the plurality of BWPs, the cross BWP scheduling may be applied.

(Third aspect)
In a third aspect, control of one or more UL BWPs and activation or deactivation of the UL BWPs in a user terminal will be described.

Only a single UL BWP may be configured for the user terminal, or multiple UL BWPs may be configured.

The activation or deactivation of each UL BWP may be controlled based on explicit or implicit indication information, regardless of the activation or deactivation of one or more DL BWPs. For example, the user terminal may activate the UL BWP if the UL grant is detected by monitoring the CO RESET of the DL BWP. Also, activation or deactivation of DL BWP may be controlled with or without UL grant.

Alternatively, activation or deactivation of each UL BWP may be controlled in accordance with the pre-associated DL BWP. For example, if a DW BWP is activated, the UL BWP associated with the DL BWP may also be activated. Similarly, when a DW BWP is deactivated, the UL BWP associated with that DL BWP may also be deactivated.

FIG. 8 is a diagram showing an example of setting of UL BWP according to the third aspect. In FIG. 8, differences from FIG. 2 will be mainly described. 8, DL BWPs # 1 and # 2 are set as in FIG. 2, but a single UL BWP is set, which is different from FIG. Although a single UL BWP is set in the user terminal in FIG. 8, the present invention is not limited to this.

For example, in FIG. 8, the user terminal monitors CORESET set to the activated DL BWP at a predetermined cycle. The user terminal activates UL BWP based on the UL grant detected in the CORESET. A user terminal transmits PUSCH scheduled in UL BWP based on the said UL grant.

As shown in FIG. 8, the UL BWP may have a different bandwidth (number of PRBs) than the DL BWPs # 1 and # 2. Also, the UL BWP may be provided in at least a part of the DL BWPs # 1 and # 2.

Also, even if the UL BWP is deactivated, if the BWP used for RACH transmission, periodic CSI report, etc. is set separately from the UL BWP, the RACH or periodic CSI is not activated without activating the UL BWP. You may report.

FIG. 9 is a diagram showing another example of setting of UL BWP according to the third aspect. In FIG. 9, differences from FIG. 8 will be mainly described. FIG. 9 differs from FIG. 8 in that a plurality of UL BWPs are set in the user terminal.

As shown in FIG. 9, at least one of the plurality of UL BWPs may have the same bandwidth (the same PRB) as at least one DL BWP. For example, in FIG. 9, UL BWP # 1 is configured with the same bandwidth (the same PRB) as DL BWP # 1. UL BWP # 2 is configured as part of DL BWP # 2.

As shown in FIG. 9, when a plurality of UL BWPs are configured for a user terminal, the UL grant may include an index (BWP index) of UL BWPs for which PUSCH is scheduled. The user terminal may control the activation of the UL BWP based on the BWP index included in the UL grant.

For example, in FIG. 9, the user terminal monitors CORESET set to the activated DL BWP at a predetermined cycle. In FIG. 9, since the UL grant detected in the CORESET includes BWP index # 2, the user terminal may deactivate UL BWP # 1 and activate UL BWP # 2. The user terminal may transmit the PUSCH scheduled in UL BWP # 2 based on the UL grant.

Although it is assumed in FIG. 9 that UL BWP # 1 is deactivated when UL BWP # 2 is activated, it is not limited to this. Even when UL BWP # 2 is activated, UL BWP # 1 may be kept active.

<Applications of multiple UL BWPs>
When a plurality of UL BWPs are set in the user terminal, the same UL signal may be transmitted between the plurality of UL BWPs, or different UL signals may be transmitted. The UL signal is, for example, a UL data channel (eg, PUSCH), a UL control channel (eg, PUCCH), a reference signal (eg, SRS: Sounding Reference Signal and / or DMRS), a random access channel (eg, PRACH: Physical). It is at least one of Random Access Channel).

FIG. 10 is a diagram showing an example of transmission of UL signals in each UL BWP according to the third aspect. In FIG. 10, it is assumed that UL BWP # 1 and UL BWP # 2 having a wider bandwidth than UL BWP # 1 are set in the user terminal.

As shown in FIG. 10, UL BWP # 1 includes PRACH and / or PUCCH configuration information. On the other hand, in UL BWP # 1, at least one setting information of PUSCH, SRS, and DMRS may not be included, or may be included. In addition, UL BWP # 2 includes at least one setting information of PUSCH, SRS, and DRMS. On the other hand, in UL BWP # 2, configuration information of PRACH and / or PUCCH may not be included or may be included.

Thus, the UL signals that are always set in each UL BWP may be different, and the UL signals that can be transmitted by the user terminal may be different in each UL BWP. For example, in FIG. 10, the user terminal may control transmission of the PRACH and / or PUCCH in UL BWP # 1, and may control transmission of at least one of PUSCH, SRS, and DMRS in UL BWP # 2.

In FIG. 10, since UL signals to be set in each UL BWP can be made different, efficient transmission of UL signals in each UL BWP should be performed when a plurality of UL BWPs are set as user terminals. Can.

<Activation / Deactivation Control>
The user terminal may control activation and / or deactivation of one or more UL BWPs configured for the user terminal based on explicit or implicit indication information. The explicit indication information may be, for example, DCI (UL grant) or MAC CE including a resource allocation field set to a specific value (for example, 0).

The implicit indication information may be, for example, RAR, message 4 or the UL grant described in FIGS. The RAR is transmitted from the radio base station according to the PRACH from the user terminal. Also, the message 4 is a collision resolution message transmitted from the radio base station according to the control message when the user terminal transmits the control message of the upper layer using the resource specified by the UL grant included in the RAR. It is. The user terminal that has received the message 4 transitions from the idle state to the RRC connected state.

The user terminal may also control the deactivation of the UL BWP using a timer (joint timer or UL timer). The control of deactivation of UL BWP using the timer is as described in FIG.

FIG. 11 is a diagram showing an example of UL BWP activation / deactivation control according to the third aspect. In FIG. 11, the user terminal is DCI (for example, UL grant for allocating PUSCH in UL BWP # 2 or DCI for activation (for example, UL grant for which a resource allocation field is set to a specific value)), UL BWP # 2 may be activated based on MAC CE, RAR or message 4. In this case, the user terminal may deactivate UL BWP # 1.

Also, in FIG. 11, the user terminal may deactivate UL BWP # 2 based on deactivation indication information (for example, MAC CE or DCI) or a timer. In this case, the user terminal may activate UL BWP # 1.

Note that although the active BWP is changed in FIG. 11, a single UL BWP (e.g., UL BWP # 1) may always be kept active.

(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. 12 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 shown in FIG. 12 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 Can be configured.

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. 13 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. 14 is a diagram showing an example of a functional configuration of the radio base station according to the present embodiment. FIG. 14 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. As shown in FIG. 14, 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.

Also, the control unit 301 may control setting of one or more BWPs (one or more DL BWPs and / or one or more UL BWPs) for the user terminal 20. Specifically, the control unit 301 may control generation and / or transmission of BWP setting information (second aspect).

In addition, the control unit 301 may set one or more BWPs (one or more DL BWPs and / or one or more UL BWPs) (a DL frequency band in a carrier and / or a UL frequency band) set in the user terminal 20. It may control activation or deactivation. Specifically, the control unit 301 may control generation and / or transmission of explicit or implicit indication information of the one or more BWPs (first and third aspects).

Also, the control unit 301 may control setting of one or more CORESETs (control resource regions) in one or more DL BWPs. Also, the control unit 301 may control the setting of the search space in one or more CORESETs.

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 can 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.

<User terminal>
FIG. 15 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).

The transmission / reception unit 203 can 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. 16 is a diagram showing an example of a functional configuration of a user terminal according to the present embodiment. In FIG. 16, the functional blocks of the characterizing portion in the present embodiment are mainly shown, and the user terminal 20 also has other functional blocks necessary for wireless communication. As shown in FIG. 16, 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. Have.

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 may also control setting of one or more BWPs (one or more DL BWPs and / or one or more UL BWPs) in the carrier. Specifically, the control unit 401 may set the one or more BWPs based on the BWP setting information from the radio base station 20 (second aspect).

Also, the control unit 401 may control the setting of one or more CORESETs (control resource regions) in one or more DL BWPs. Further, the control unit 401 may control the setting of the search space in one or more CORESETs.

Also, the control unit 401 monitors the CORESET (or search space in the CORESET) (control resource area) (blind decoding), and DCI (DL assignment, UL grant, group DCI, common DCI for the user terminal 20). , And at least one of activation DCI and deactivation DCI) may be controlled.

Also, the control unit 401 may control the transmission direction for each symbol in a time unit (for example, a slot) which is a scheduling unit of the DL data channel. Specifically, the control unit 401 may determine DL symbols and / or UL symbols in the slot based on the SFI.

Further, the control unit 401 is configured to set one or more BWPs (one or more DL BWPs and / or one or more UL BWPs) (a DL frequency band in a carrier and / or a UL frequency band) set in the user terminal 20. Activation or deactivation may be controlled (first and third aspects).

Specifically, the control unit 401 determines the DL BWP based on DCI (DL assignment for scheduling the PDSCH of the DL BWP # 2) detected by the CORESET of the DL BWP # 1 (the first frequency band for DL). The activation of # 2 (second DL frequency band) may be controlled (first aspect). Further, the control unit 401 may control reception of a PDSCH (DL data channel) based on the DCI in the DL BWP # 2 activated based on the DCI (first and second activations) control).

In addition, the control unit 401 sets a control resource area set in DL BWP # 2 activated based on DCI (DCI indicating activation of DLBWP # 2) detected by CORESET of MAC CE or DL BWP # 1. To control the reception of other DCI used for scheduling of the DL data channel in DL BWP # 2 (third activation control).

Further, the control unit 401 may control the deactivation of the DL BWP # 2 (second DL frequency band) based on a DCI or a MAC control element or a predetermined timer (first aspect) ).

In addition, the control unit 401 may control transmission of a UL signal in UL BWP (frequency band for UL) based on DCI detected in CORESET (control resource region) of DL BWP (frequency band for DL). (Third aspect).

Also, the control unit 401 may control activation or deactivation of one or more UL BWPs (frequency bands for UL). Note that at least one UL BWP may be set to the same frequency band as at least one DL BWP (DL frequency band) (third aspect).

In addition, the control unit 401 controls transmission of a random access channel and / or a UL control channel in UL BWP # 1 (first UL frequency band), and in UL BWP # 2 (second UL frequency band). The transmission of at least one of a UL data channel, a sounding reference signal, and a demodulation reference signal may be controlled (third aspect).

In addition, the control unit 401 may be a DL BWP (DL frequency) associated with a DCI, a medium access control (MAC) control element, a random access response or a message for collision resolution, or a UL BWP (frequency band for UL). The activation of the UL BWP may be controlled based on the bandwidth) (third aspect).

In addition, the control unit 401 may control the deactivation of UL BWP (UL frequency band) based on a DCI or MAC control element or a predetermined timer.

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 can 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.

<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. 17 is a diagram showing an example of a hardware configuration of a radio base station and a 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).

The devices shown in FIG. 17 are 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 consisting of 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 (6)

1. A reception unit that monitors a control resource region set in a first downlink (DL) frequency band in a carrier and receives downlink control information (DCI);
   A control unit that controls activation of a second DL frequency band in the carrier based on the DCI;
   A user terminal characterized by comprising.
2. The DCI is used to schedule downlink (DL) data channels in the second DL frequency band,
   The user according to claim 1, wherein the control unit controls reception of the DL data channel based on the DCI in the second DL frequency band activated based on the DCI. Terminal.
3. The DCI indicates activation of the second DL frequency band,
   The receiving unit monitors a control resource region set in the second DL frequency band activated based on the DCI, and schedules DL data channel in the second DL frequency band. The user terminal according to claim 1, characterized in that it receives another DCI to be used.
4. The user terminal according to any one of claims 1 to 3, wherein the first DL frequency band is maintained active.
5. The control unit controls the deactivation of the second DL frequency band based on the DCI or MAC control element received by the reception unit, or a predetermined timer. The user terminal according to any one of claims 1 to 4.
6. At the user terminal
   Monitoring a control resource region set in a first downlink (DL) frequency band in a carrier and receiving downlink control information (DCI);
   Controlling activation of a second DL frequency band in the carrier based on the DCI;
   A wireless communication method comprising:

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