WO2019171519A1 - User terminal and wireless communication method - Google Patents

Abstract

A user terminal according to the present disclosure is provided with: a reception unit that receives a Medium Access Control (MAC) control element including a field indicating a status of a transmission configuration index (TCI) of a control resource set that is set in a partial band in a carrier; and a control unit that controls, on the basis of the status of the TCI indicated by the field, the reception of a downlink control channel that is mapped to a predetermined resource unit in the control resource set.

Description

User terminal and wireless communication method

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

In the UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) has been specified for the purpose of higher data rates and low delay (Non-patent Document 1). Also, LTE-A (also referred to as LTE Advanced, LTE Rel. 10, 11 or 12) has been specified for the purpose of further widening and speeding up from LTE (also referred to as LTE Rel. 8 or 9), and LTE. Successor systems (for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), NR (New Radio), NX (New radio access), FX (Future generation radio access), LTE Rel. 13, 14 or (Also referred to as after 15).

In an existing LTE system (for example, LTE Rel. 8-13), a user terminal (UE: User Equipment) is based on downlink control information (DCI: Downlink Control Information, also called DL assignment) from a radio base station. Then, reception of a downlink shared channel (for example, PDSCH: Physical Downlink Shared Channel) is controlled. Further, the user terminal controls transmission of an uplink shared channel (for example, PUSCH: Physical Uplink Shared Channel) based on DCI (also referred to as UL grant or the like).

In future wireless communication systems (for example, NR, 5G, 5G +, or Rel. 15 or later), it is considered to perform communication using beam forming (BF). In order to improve communication quality using BF, at least one of signal transmission and reception is controlled in consideration of a pseudo-co-location (QCL) relationship (QCL relationship) between a plurality of signals. It is being considered.

In the future wireless communication system, the user terminal is based on the state (TCI state) of the transmission configuration index (TCI) indicating (including) information related to the QCL of the control resource set (CORESET: Control Resource Set). Control of reception of a downlink control channel (for example, PDCCH) mapped to a predetermined resource unit of CORESET is under study.

Also, in the above-described future wireless communication system, it has been studied to specify a TCI state applied to the CORESET using a MAC control element (MAC CE: Medium Access Control Control Element).

However, when one or more CORESET TCI states set in the user terminal are specified using the MAC CE, the user terminal cannot properly recognize the CORESET TCI state, and as a result, receives the downlink control channel in the CORESET. Processing may not be properly controlled.

The present invention has been made in view of this point, and an object of the present invention is to provide a user terminal and a wireless communication method capable of appropriately recognizing one or more CORESET TCI states set in the user terminal.

A user terminal according to an aspect of the present invention receives a MAC (Medium Access Control) control element including a field indicating a state of a transmission configuration index (TCI) of a control resource set set in a partial band in a carrier And a control unit that controls reception of a downlink control channel mapped to a predetermined resource unit in the control resource set based on the state of the TCI indicated by the field.

According to one aspect of the present invention, the user terminal can appropriately recognize one or more CORESET TCI states set in the user terminal.

FIG. 1 is a diagram illustrating an example of BWP and CORESET set in a user terminal. 2A to 2C are diagrams illustrating an example of a MAC CE according to the first aspect. 3A to 3C are diagrams illustrating an example of a MAC CE according to the second aspect. It is a figure which shows an example of schematic structure of the radio | wireless communications system which concerns on this Embodiment. It is a figure which shows an example of the whole structure of the wireless base station which concerns on this Embodiment. It is a figure which shows an example of a function structure of the radio 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 radio base station and user terminal which concern on this Embodiment.

(QCL for PDSCH)
In a future wireless communication system (for example, NR, 5G, 5G +, or Rel. 15 or later), the user terminal may Control of reception processing (for example, at least one of demapping, demodulation, and decoding) of a downlink shared channel is under consideration.

Here, pseudo-collocation (QCL) is an index indicating the statistical properties of the channel. For example, when one signal and another signal have a QCL relationship, a Doppler shift, a Doppler spread, an average delay, and a delay spread (delay) are set between these different signals. spread) and a spatial parameter (for example, a spatial reception parameter (Spatial Rx Parameter)) can be assumed to be the same.

QCL may be provided with one or more types (QCL types) having different parameters that can be assumed to be the same. For example, four QCL types A to D having different parameters that can be assumed to be the same may be provided.

QCL type A: QCL that can be assumed to have the same Doppler shift, Doppler spread, average delay and delay spread
QCL type B: QCL that can be assumed to have the same Doppler shift and Doppler spread
QCL type C: QCL that can be assumed to have the same average delay and Doppler shift
QCL type D: QCL that can be assumed to have the same spatial reception parameters

The state of a transmission configuration indicator (TCI: Transmission Configuration Indicator) (TCI state (TCI-state)) may indicate (may also include information on QSCH of PDSCH (also referred to as QCL information or QCL information for PDSCH)). ). The PDCL QCL information is, for example, information related to the QCL between the PDSCH (or the DMRS port for the PDSCH) and a downlink reference signal (DL-RS), for example, a DL- It may include at least one of RS information (DL-RS related information) and information indicating the QCL type (QCL type information).

Here, the DMRS port is an antenna port for a demodulation reference signal (DMRS). The DMRS port may be a DMRS port group including a plurality of DMRS ports, and the DMRS port in this specification may be read as a DMRS port group.

The DL-RS related information may include at least one of information indicating a DL-RS having a QCL relationship and information indicating a resource of the DL-RS. For example, when a plurality of reference signal sets (RS sets) are set in the user terminal, the DL-RS related information includes the PDSCH (or the DMRS port for PDSCH) and the QCL among the reference signals included in the RS set. A predetermined DL-RS to be related and a resource for the DL-RS may be indicated.

Here, the DL-RS is a synchronization signal (for example, at least one of a primary synchronization signal (PSS: Primary Synchronization Signal) and a secondary synchronization signal (SSS)), a mobility reference signal (MRS: Mobility RS), Synchronization signal block (SSB), channel state information reference signal (CSI-RS: Channel Sate Information-Reference Signal), demodulation reference signal (DMRS: DeModulation Reference Signal), broadcast channel (PBCH: Physical Broadcast Channel), beam-specific It may be a signal configured by extending and / or changing at least one of the signals or the like (for example, a signal configured by changing density and / or period).

As described above, each TCI state can indicate (can include) QCL information for PDSCH. For the user terminal, one or more TCI states (one or more QSCH information for PDSCH) may be notified (configured) from the radio base station by higher layer signaling (for example, RRC signaling). Note that the number of TCI states set in the user terminal may be limited by the QCL type.

DCI (DL assignment) used for scheduling of PDSCH may include a predetermined field (TCI state ID field) indicating a TCI state (QCL information for PDSCH). The TCI state ID field may be configured with a predetermined number of bits (for example, 3 bits). Whether or not the TCI state ID field is included in the DCI may be controlled by a notification from the radio base station (for example, higher layer signaling).

For example, when the DCI includes a 3-bit TCI state ID field, the radio base station may preconfigure (configure) a maximum of 8 types of TCI states in the user terminal by higher layer signaling. The value of the TCI state ID field in the DCI (TCI state ID field value) may indicate one of the TCI states set in advance by higher layer signaling.

When more than 8 types of TCI states are set in the user terminal, 8 or less types of TCI states may be activated (designated) by the MAC CE. The value of the TCI state ID field in DCI may indicate one of the TCI states activated by the MAC CE.

The user terminal determines the QCL of the PDSCH (or the DMRS port of PDSCH) based on the TCI state (PDCL QCL information) indicated by the DCI. For example, the user terminal assumes that the DMRS port (or DMRS port group) of the PDSCH of the serving cell is a DL-RS and a QCL corresponding to the TCI state notified by DCI (for example, decoding) Processing and / or demodulation processing, etc.). Thereby, the reception precision of PDSCH can be improved.

(QCL for PDCCH)
Further, in the future wireless communication system, it is considered that the user terminal controls reception processing of the downlink control channel based on information (QCL information) regarding the QCL of the downlink control channel (for example, PDCCH). .

The TCI state may indicate (may include) information about the PDCCH QCL (also referred to as QCL information or PCLCH QCL information). The QCL information for the PDCCH is, for example, information related to the QCL between the PDCCH (or the DMRS port for the PDCCH) and the DL-RS. For example, information related to the DL-RS that is related to the QCL (DL-RS related information) ) And information indicating the QCL type (QCL type information). The DL-RS related information and the DL-RS are as described in the PDSCH QCL.

Alternatively, the QCL information for the PDCCH may be information related to the QCL between the control resource set (CORESET: control resource set) to which the PDCCH is mapped and the DL-RS, for example, a DL-RS having a QCL relationship. Information (DL-RS related information) and information indicating the QCL type (QCL type information) may be included.

Here, CORESET is a resource area to which a PDCCH is allocated, and may be configured to include a predetermined frequency domain resource and a time domain resource (for example, 1 or 2 OFDM symbols). PDCCH (or DCI) is mapped to a predetermined resource unit in CORESET.

The predetermined resource unit includes, for example, a control channel element (CCE: Control Channel Element), a CCE group including one or more CCEs, and a resource element group (REG: Resource Element) including one or more resource elements (RE: Resource Element). Group), one or more REG bundles (REG group), and at least one physical resource block (PRB).

The user terminal monitors (blind decoding) DCI mapped to a predetermined resource unit in CORESET (or search space in CORESET), and detects DCI for the user terminal.

For the user terminal, K (K ≧ 1) TCI states (QCL information for K PDCCHs) are notified (configured) from the radio base station by higher layer signaling (for example, RRC signaling) per CORESET. ).

When multiple TCI states are set for CORESET (K> 1), the radio base station activates (designates) a predetermined TCI state (for example, one TCI state) for the user terminal by MAC CE May be. The MAC CE may indicate (or may include) at least one of a CORESET index for changing the TCI state and one TCI state set for the CORESET. For CORESET that changes the TCI state, two or more TCI state candidates may be set in advance by higher layer signaling (for example, RRC signaling).

In addition, after the elapse of a predetermined period (for example, 4 slots or 10 symbols, etc.) from the reception of the MAC CE (PDSCH that transmits the MAC CE), the user terminal performs PDCCH monitored in the CORESET specified by the MAC CE. On the other hand, reception (channel estimation, demodulation) may be performed assuming the TCI state specified by the MAC CE.

When a single TCI state is set for CORESET (K = 1), the notification of the TCI state by MAC CE may not be performed, or the notification of the TCI state may be performed.

The user terminal determines the QCL of the PDCCH (DMRS port or CORESET of the PDCCH) based on the TCI state (QCL information for PDCCH) set or specified as described above. For example, assuming that the DMRS port (or CORESET) of the PDCCH is a DL-RS and a QCL corresponding to the TCI state, the user terminal performs PDCCH reception processing (for example, decoding processing and / or demodulation processing). Control. Thereby, the reception precision of PDCCH can be improved.

By the way, in the future wireless communication system, it is assumed that one or more CORESETs are configured for the user terminal by higher layer signaling (for example, RRC signaling). For example, one or more CORESET may be set for one serving cell (carrier, component carrier (CC)) set for the user terminal.

Further, when one or more partial frequency bands (also referred to as a partial band or a bandwidth part (BWP)) are set within the system bandwidth (carrier bandwidth) of one serving cell, one or more per one BWP CORESET may be set.

FIG. 1 is a diagram illustrating an example of BWP and CORESET set in a user terminal. As shown in FIG. 1, one or more BWPs (BWPs # 1 and # 2 in FIG. 1) may be configured in the carrier set in the user terminal. Further, one or more CORESETs (1 CORESET per BWP in FIG. 1) may be set for each BWP.

In FIG. 1, a part of BWP # 2 overlaps with BWP # 1, but BWP # 1 and # 2 may be set to non-overlapping bands. In FIG. 1, one BWP (active BWP) is active at a certain timing, but one or more BWPs may be activated. Further, in FIG. 1, only one carrier is shown, but two or more carriers may be set for the user terminal.

In FIG. 1, the user terminal monitors the CORESET (search space in the CORESET) of the active BWP, and detects DCI for the user terminal. The DCI may include information (BWP information) indicating which BWP is the DCI. The BWP information is, for example, a BWP index, and may be a predetermined field value in DCI. The user terminal may determine a BWP on which PDSCH or PUSCH is scheduled by the DCI based on the BWP information in the DCI.

For example, as shown in FIG. 1, when a user terminal detects DCI including an index of BWP # 1 in CORESET # 1, it receives a PDSCH scheduled in BWP # 1 based on the DCI. Also good. Further, when detecting the DCI including the index of BWP # 2 in CORESET # 1, the user terminal may receive the PDSCH scheduled in BWP # 2 based on the DCI. Note that DCI for scheduling PUSCH may be mapped to CORESET # 1 and / or # 2.

As shown in FIG. 1, when a plurality of CORESET # 1 and # 2 are set for a user terminal, at least one TCI state is higher layer signaling for at least one of the CORESET # 1 and # 2. It is assumed that it will be configured with In this case, it is assumed that at least one TCI state of CORESET # 1 and # 2 is designated using MAC CE.

However, when one or more CORESET TCI states set in the user terminal are specified using the MAC CE, the user terminal cannot properly recognize the CORESET TCI state, and as a result, appropriately controls the CORESET reception process. There is a fear that it cannot be done.

Therefore, the present inventors can appropriately control the reception processing of the PDCCH corresponding to the CORESET by appropriately configuring the MAC CE that specifies one or more CORESET TC states set for the user terminal. Attention was paid to the following points, and the present invention was achieved.

Hereinafter, the present embodiment will be described in detail with reference to the drawings. In the following description, the case of using the PDSCH demodulation based on the TCI state will be described, but the present embodiment is not limited to this. The present invention can be applied to operations using the TCI state (for example, reception processing of other signals or channels). Moreover, in the following description, QCL may be read as QCL (spatially quasi co-located) in space, spatial relation (spatial relation), or the like.

(First aspect)
In the first aspect, the MAC CE includes a field (also referred to as a TCI state field or a TCI state ID field) indicating a TCI state (or an identifier (TCI state ID) of the TCI state), and a TCI state indicated by the field. It includes at least a field (also referred to as a CORESET field, a CORESET ID field, or the like) indicating an applied CORESET (or an identifier (CORESET ID) of the CORESET).

Based on the TCI state indicated by the TCI state ID field, the user terminal maps to a predetermined resource unit (for example, at least one of CCE, CCE group, REG, REG bundle, PRB) in the CORESET indicated by the CORESET ID field. Reception of the received PDCCCH may be controlled.

Here, the TCI state may indicate (may include) information related to the above-mentioned PDCCH (or DMRS port of the PDCCH) and DL-RS QCL, or information related to the above-mentioned QCL between CORESET and DL-RS. ).

2A to 2C are diagrams showing an example of the MAC CE according to the first mode. As shown in FIGS. 2A to 2C, the MAC CE may be divided in units of octets (8 bits). 2A to 2C, “R” is a reserved bit, and may be set to 0, for example. 2A to 2C are merely examples, and the number of bits and / or positions of each field are not limited to those illustrated. Further, the spare bit “R” is not limited to the first bit, and may be inserted at one or more positions (not shown).

As shown in FIG. 2A, the MAC CE may include a TCI state ID field indicating the TCI state identified by the TCI state ID and a CORESET ID field indicating the CORESET to which the TCI state is applied. The TCI state ID field may be 6 bits, for example. The CORESET ID field may be 2 bits.

In FIG. 2A, the MAC CE may include one or more CORESET ID fields and one or more TCI state ID fields. When a plurality of CORESET TCI states are specified, a set of a 2-bit CORESET ID field and a 6-bit TCI state ID field may be repeatedly arranged.

Alternatively, the CORESET ID field may specify a CORESET ID to which the TCI state ID field is applied in a bitmap format. The CORESET ID field may be composed of 2 bits or more. For example, if the CORESET ID field is composed of 4 bits and the value is “0110”, the CORESET to which the TCI state ID field is applied is CORESET # 1 and CORESET # 2, and different TCI state ID fields for each. Can be included. That is, a single CORESET ID field indicating one or more CORESET and one or more TCI state ID fields respectively corresponding to the one or more CORESET may be included in the MAC CE.

2A, the MAC CE may include a serving cell to which the MAC CE is applied (or a field (also referred to as a serving cell field or a serving cell ID field) indicating an identifier (serving cell ID) of the serving cell). For example, the serving cell ID field may be 5 bits.

Further, as shown in FIG. 2A, the MAC CE may include a BWP to which the MAC CE is applied (or a field indicating the identifier (BWP ID) of the BWP (also referred to as a BWP field or a BWP ID field). For example, the BWP ID field may be 2 bits.

In FIG. 2A, when specifying one or more CORESET TCI states in a plurality of BWPs, a set including a 2-bit BWP ID field, one or more CORESET ID fields, and one or more TCI state ID fields is repeated. It may be arranged.

Alternatively, the BWP ID field may be composed of two or more bits, and may specify one or more BWPs to which the TCI state ID field is applied in a bitmap format. The BWP ID field may be composed of 2 bits or more. For example, if the BWP ID field is composed of 2 bits and the value is “11”, one or more CORESET TCI state ID fields corresponding to 2 bits each (for example, BWP # 0 and # 1) May be included. In this case, the CORESET ID field may be provided for each BWP, or may be provided for one or more BWPs. Further, the CORESET ID field may designate a CORESET ID to which the TCI state ID field is applied in the corresponding BWP in the bitmap format as described above.

In FIG. 2A, since the CORESET ID is 2 bits, it can take only a value of 0 to 3. On the other hand, in the CORESET set in the user terminal, the CORESET ID is assigned to a plurality of BWPs by serial numbers, and therefore the range of the CORESET ID set in higher layer signaling (for example, RRC signaling) is 0-11. It becomes. In order to associate the value of the CORESET ID field included in the MAC CE with the actual CORESET ID, the user terminal obtains the CORESET ID to which the TCI state is applied from both the BWP ID and the CORESET ID included in the MAC CE. Also good.

For example, the user terminal selects a predetermined number (for example, a maximum of 4) of CORESET included in (corresponding to) the BWP according to the value of the BWP ID, and sets the CORESET ID of the predetermined number of CORESET to a predetermined value. According to a rule (for example, ascending order), it can be mapped to the value of the CORESET ID field (for example, a maximum of four values in the case of 2 bits) included in the MAC CE. For example, if the CORESET corresponding to the BWP ID # 1 is CORESET ID = # 3, # 4, # 6, # 7, and the BWP ID included in the MAC CE = 1, the value of the CORESET ID field of the MAC CE CORESET corresponding to 0, 1, 2, and 3 are CORESET ID = # 3, # 4, # 6, and # 7, respectively.

Also, as shown in FIGS. 2B and 2C, the MAC CE may not include the BWP ID field (see FIG. 2A). 2B and 2C, it demonstrates centering on difference with FIG. 2A.

As shown in FIG. 2B, the user terminal may assume that the MAC CE includes one or more CORESET TCI states of the active BWP in the serving cell indicated by the serving cell ID field. For example, in FIG. 2B, the user terminal may assume that the CORESET and TCI states indicated by the CORESET ID field and the TCI state ID field are the CORESET of the active BWP and its TCI state, respectively.

Alternatively, as shown in FIG. 2C, the user terminal assumes that the MAC CE includes one or more CORESET TCI states in at least one of the active BWP, the initial BWP, and the default BWP in the serving cell indicated by the serving cell ID field. Also good.

Here, the initial BWP is a BWP used for initial access (also referred to as a random access procedure or the like) in the serving cell, and may be referred to as an initial active BWP or the like. The default BWP is a BWP activated by default and may be used for initial access. The default BWP may be a BWP that is activated (falls back) by deactivating the active BWP when the PDSCH or the PUSCH is not scheduled for a predetermined period of time in the active BWP. The determination that the PDSCH or the PUSCH is not scheduled for a predetermined period can be made, for example, based on whether or not a BWP inactivity timer that counts a non-scheduled period with a timer has expired.

For example, in FIG. 2C, the MAC CE is the CORESET ID for the active BWP CORESET ID field and TCI state ID field, and at least one of the initial BWP and default BWP (initial / default BWP) following the serving cell ID field. Field and a TCI state ID field.

In FIG. 2C, the CORESET ID field and the TCI state ID field for active BWP may be two or more. Similarly, the CORESET ID field and the TCI state ID field for the initial / default BWP may be two or more. When a plurality of CORESET TCI states are specified in at least one of the active BWP and the initial / default BWP, a set of a 2-bit CORESET ID field and a 6-bit TCI state ID field may be repeatedly arranged. .

In addition, which BWP CORESET ID field and TCI state ID field are included in the MAC CE in any order may be determined in advance or explicitly notified by higher layer signaling (for example, system information or RRC signaling). Or may be derived implicitly. For example, in FIG. 2C, the CORESET ID field and the TCI state ID field are provided in the order of active BWP and initial / default BWP. However, the order is not limited to this, and the order of initial / default BWP and active BWP is as follows. Also good.

In the first aspect, since the MAC CE includes the CORESET ID field and the TCI state ID field, it is possible to explicitly notify the user terminal which CORESET TCI state is to be designated. Therefore, the user terminal can appropriately recognize one or more CORESET TCI states set in the user terminal.

(Second aspect)
The second aspect is different from the first aspect in that the MAC CE includes a TCI state ID field but does not include a CORESET ID field. Below, it demonstrates centering on difference with a 1st aspect.

In the second mode, the user terminal determines (assums) which CORESET TCI state each TCI state ID field indicates to the MAC CE according to a predetermined rule.

The predetermined rule may specify that a CORESET TCI state ID field indicated by the CORESET ID is included according to a predetermined order (for example, ascending order) of the CORESET ID. The predetermined rule may include only a CORESET CORESET ID in which a plurality of TCI states are set by RRC signaling and a TCI state ID can be specified by the MAC CE in a predetermined order, or all CORESET CORESETs. IDs may be included in a predetermined order. Further, the predetermined rule may specify that the TCI state ID field is included in a predetermined order (for example, ascending order) of the CORE ID for each BWP. The BWP may be designated by a BWP ID field, or may be a predetermined BWP (for example, at least one of active BWP, initial BWP, and default BWP).

For example, in the predetermined rule, one or more CORESET TCI state ID fields for the initial BWP are arranged in ascending order of the CORESET ID of the initial BWP, and then one or more for the initial BWP in ascending order of the CORESET ID of the default BWP. CORESET TCI state ID field may be arranged, and subsequently, one or more CORESET TCI state ID fields for the initial BWP may be arranged in ascending order of the CORESET ID of the active BWP.

3A to 3C are diagrams illustrating an example of the MAC CE according to the second aspect. In FIGS. 3A to 3C, the difference from FIGS. 2A to 2C will be mainly described.

As shown in FIG. 3A, the MAC CE may include a serving cell ID field, a BWP ID field, and a TCI state ID field indicating the TCI state of each CORESET in the BWP indicated by the BWP ID field.

For example, in FIG. 3A, it is assumed that CORESET # 0 and # 1 are included in the BWP indicated by the BWP ID. In this case, as shown in FIG. 3A, the MAC CE may include a TCI state ID field for CORESET # 1 followed by a TCI state ID field for CORESET # 0 in ascending order of the CORESET ID.

In FIG. 3A, when the CORESET TCI states in a plurality of BWPs are designated, a plurality of sets each including a BWP ID field and one or more TCI state ID fields may be repeated in the MAC CE.

Alternatively, the BWP ID field may specify one or more BWPs to which the TCI state ID field is applied in a bitmap format. The BWP ID field may be composed of 2 bits or more. For example, if the BWP ID field is composed of 2 bits and the value is “11”, one or more CORESET TCI state ID fields corresponding to 2 bits each (for example, BWP # 0 and # 1) May be included.

Also, as shown in FIGS. 3B and 3C, the MAC CE may not include the BWP ID field (see FIG. 3A). 3B and 3C, it demonstrates centering on difference with FIG. 3A.

As shown in FIG. 3B, the user terminal may assume that the MAC CE includes one or more CORESET TCI states of the active BWP in the serving cell indicated by the serving cell ID field. For example, in FIG. 3B, the user terminal may assume that the TCI state indicated by each TCI state ID field is CORESET defined by a predetermined rule in the active BWP.

Alternatively, as shown in FIG. 3C, the user terminal assumes that the MAC CE includes one or more CORESET TCI states in at least one of the active BWP, initial BWP, and default BWP in the serving cell indicated by the serving cell ID field. Also good.

As shown in FIG. 3C, the MAC CE follows the serving cell ID field, one or more TCI state ID fields for the active BWP, and one or more for at least one of the initial BWP and the default BWP (initial / default BWP). Includes a TCI state ID field.

For example, in FIG. 3C, it is assumed that the active BWP includes CORESET # 0 and # 1, and the initial / default BWP includes CORESET # 0. For this reason, in FIG. 3C, the TCI state ID field of the CORESET # 0 of the initial / default BWP is set in the MAC CE following the TCI state ID field for the CORESET # 0 and # 1 in ascending order of the CORESET ID in the active BWP. Placed in.

In the second aspect, since the MAC CE includes one or more BWP TCI state ID fields in the order determined by a predetermined rule, explicitly indicate the CORESET to which the TCI state indicated by the TCI state ID field is applied. There is no need to do. For this reason, there is no need to include the CORESET ID field in the MAC CE, and the overhead of the MAC CE can be reduced.

(Wireless communication system)
Hereinafter, the configuration of the wireless communication system according to the present embodiment will be described. In this wireless communication system, communication is performed using at least one combination of the plurality of aspects.

FIG. 4 is a diagram illustrating an example of a schematic configuration of the wireless communication system according to the present embodiment. In the radio communication system 1, 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 applied. can do.

The wireless communication system 1 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), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or a system that realizes these.

The radio communication system 1 includes a radio base station 11 that forms a macro cell C1 having a relatively wide coverage, and a radio base station 12 (12a-12c) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. It is equipped with. Moreover, the user terminal 20 is arrange | positioned at the macrocell C1 and each small cell C2. The arrangement, the number, and the like of each cell and user terminal 20 are not limited to the mode shown in the figure.

The user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 at the same time using CA or DC. Moreover, the user terminal 20 may apply CA or DC using a plurality of cells (CC) (for example, 5 or less CCs, 6 or more CCs).

Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (also referred to as an existing carrier or a legacy carrier). On the other hand, a carrier having a relatively high frequency band (for example, 3.5 GHz, 5 GHz, etc.) and a wide bandwidth may be used between the user terminal 20 and the radio base station 12, or The same carrier may be used. The configuration of the frequency band used by each radio base station is not limited to this.

Further, the user terminal 20 can perform communication using time division duplex (TDD) and / or frequency division duplex (FDD) in each cell. In each cell (carrier), a single neurology may be applied, or a plurality of different neurology may be applied.

Numerology may be a communication parameter applied to transmission and / or reception of a certain signal and / or channel, for example, subcarrier interval, bandwidth, symbol length, cyclic prefix length, subframe length. , TTI length, number of symbols per TTI, radio frame configuration, filtering process, windowing process, and the like.

The wireless base station 11 and the wireless base station 12 (or between the two wireless base stations 12) are connected by wire (for example, optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface, etc.) or wirelessly. May be.

The radio base station 11 and each radio base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30. The upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto. Each radio base station 12 may be connected to the higher station apparatus 30 via the radio 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. The radio base station 12 is a radio base station having local coverage, and includes 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), and transmission / reception. It may be called a point. Hereinafter, when the radio base stations 11 and 12 are not distinguished, they are collectively referred to as a radio base station 10.

Each user terminal 20 is a terminal that supports various communication schemes such as LTE and LTE-A, and may include not only a mobile communication terminal (mobile station) but also a fixed communication terminal (fixed station).

In the radio communication system 1, as a radio access method, orthogonal frequency division multiple access (OFDMA) is applied to the downlink, and single carrier-frequency division multiple access (SC-FDMA) is used for the uplink. Frequency Division Multiple Access) and / or OFDMA is applied.

OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier. SC-FDMA is a single carrier transmission in which the system bandwidth is divided into bands each composed of one or continuous resource blocks for each terminal, and a plurality of terminals use different bands to reduce interference between terminals. It is a method. The uplink and downlink radio access schemes are not limited to these combinations, and other radio access schemes may be used.

In the wireless communication system 1, downlink channels include a downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like. Used. User data, higher layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. Moreover, MIB (Master Information Block) is transmitted by PBCH.

Downlink L1 / L2 control channel is downlink 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) Including at least one of Downlink control information (DCI: Downlink Control Information) including PDSCH and / or PUSCH scheduling information is transmitted by the PDCCH.

Note that scheduling information may be notified by DCI. For example, DCI for scheduling DL data reception may be referred to as DL assignment, and DCI for scheduling UL data transmission may be referred to as UL grant.

The number of OFDM symbols used for PDCCH is transmitted by PCFICH. The PHICH transmits HARQ (Hybrid Automatic Repeat reQuest) delivery confirmation information (for example, retransmission control information, HARQ-ACK, ACK / NACK, etc.) to the PUSCH. EPDCCH is frequency-division multiplexed with PDSCH (downlink shared data channel), and is used for transmission of DCI and the like in the same manner as PDCCH.

In the wireless communication system 1, as an uplink channel, an uplink shared channel (PUSCH) shared by each user terminal 20, an uplink control channel (PUCCH: Physical Uplink Control Channel), a random access channel (PRACH: Physical Random Access Channel) is used. User data, higher layer control information, etc. are transmitted by PUSCH. Also, downlink radio link quality information (CQI: Channel Quality Indicator), delivery confirmation information, scheduling request (SR), etc. are transmitted by PUCCH. A random access preamble for establishing connection with the cell is transmitted by the PRACH.

In the wireless communication system 1, as downlink reference signals, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), and a demodulation reference signal (DMRS: DeModulation Reference Signal), Positioning Reference Signal (PRS), etc. are transmitted. In the wireless communication system 1, a measurement reference signal (SRS: Sounding Reference Signal), a demodulation reference signal (DMRS), and the like are transmitted as uplink reference signals. The DMRS may be referred to as a user terminal specific reference signal (UE-specific Reference Signal). Further, the transmitted reference signal is not limited to these.

<Wireless base station>
FIG. 5 is a diagram illustrating an example of the overall configuration of the radio base station according to the present embodiment. The radio base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. Note that the transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may each be configured to include one or more.

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

In the baseband signal processing unit 104, with respect to user data, PDCP (Packet Data Convergence Protocol) layer processing, user data division / combination, RLC (Radio Link Control) retransmission control and other RLC layer transmission processing, MAC (Medium Access) Control) Retransmission control (for example, HARQ transmission processing), scheduling, transmission format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, precoding processing, and other transmission processing are performed and the transmission / reception unit 103. The downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.

The transmission / reception unit 103 converts the baseband signal output by precoding for each antenna from the baseband signal processing unit 104 to a radio frequency band and transmits the converted signal. The radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101. The transmission / reception unit 103 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present disclosure. In addition, the transmission / reception part 103 may be comprised as an integral transmission / reception part, and may be comprised from a transmission part and a receiving part.

On the other hand, for the upstream signal, the radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102. The transmission / reception unit 103 receives the uplink signal amplified by the amplifier unit 102. The transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.

The baseband signal processing unit 104 performs fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT: Inverse Discrete Fourier Transform) processing, and error correction on user data included in the input upstream signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106. The call processor 105 performs communication channel call processing (setting, release, etc.), status management of the radio base station 10, radio resource management, and the like.

The transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface. The transmission path interface 106 transmits / receives signals (backhaul signaling) to / from other radio base stations 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). May be.

The transmission / reception unit 103 may further include an analog beam forming unit that performs analog beam forming. The analog beam forming unit includes an analog beam forming circuit (for example, phase shifter, phase shift circuit) or an analog beam forming apparatus (for example, phase shifter) described based on common recognition in the technical field according to the present invention. can do. In addition, the transmission / reception antenna 101 can be configured by an array antenna, for example. Further, the transmission / reception unit 103 is configured to be able to apply single BF and multi-BF.

The transmission / reception unit 103 may transmit a signal using a transmission beam or may receive a signal using a reception beam. The transmission / reception unit 103 may transmit and / or receive a signal using a predetermined beam determined by the control unit 301.

Further, the transceiver 103 transmits a downlink (DL) signal (including at least one of a DL data signal (downlink shared channel), a DL control signal (downlink control channel), and a DL reference signal) to the user terminal 20. Then, an uplink (UL) signal (including at least one of a UL data signal, a UL control signal, and a UL reference signal) is received from the user terminal 20.

Moreover, the transmission / reception part 103 transmits DCI with respect to the user terminal 20 using a downlink control channel. Further, the transmission / reception unit 103 transmits a MAC control element (MAC CE) using the downlink shared channel. Further, the transmission / reception unit 103 may transmit information (QCL information) related to the QCL of the downlink shared channel and / or downlink control channel (CORESET) (or a TCI state indicating (including) the QCL information).

FIG. 6 is a diagram illustrating an example of a functional configuration of the radio base station according to the present embodiment. In addition, in this example, the functional block of the characteristic part in this Embodiment is mainly shown, and it may be assumed that the radio base station 10 also has another functional block required for radio | wireless communication.

The baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. These configurations may be included in the radio base station 10, and a part or all of the configurations may not be included in the baseband signal processing unit 104.

The control unit (scheduler) 301 controls the entire radio base station 10. The control unit 301 can be configured by a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present disclosure.

The control unit 301 controls, for example, signal generation in the transmission signal generation unit 302, signal allocation in the mapping unit 303, and the like. The control unit 301 also controls signal reception processing in the reception signal processing unit 304, signal measurement in the measurement unit 305, and the like.

The control unit 301 controls scheduling (for example, resource allocation) of system information, downlink data signals (for example, signals transmitted on PDSCH), and downlink control signals (for example, signals transmitted on PDCCH and / or EPDCCH). . In addition, the control unit 301 controls generation of a downlink control signal, a downlink data signal, and the like based on a result of determining whether or not retransmission control is necessary for the uplink data signal.

The control unit 301 controls scheduling such as a synchronization signal (for example, PSS / SSS) and a downlink reference signal (for example, CRS, CSI-RS, DMRS).

The control unit 301 uses the digital BF (for example, precoding) by the baseband signal processing unit 104 and / or the analog BF (for example, phase rotation) by the transmission / reception unit 103 to form a transmission beam and / or a reception beam. May be performed.

The control unit 301 may control at least one configuration of carrier, BWP, and CORESET for the user terminal 20. Further, the control unit 301 may control setting of one or more TCI states per CORESET for the user terminal 20.

Also, the control unit 301 may control the relationship of pseudo collocation (QCL) among a plurality of signals, and may control at least one of setting, generation, and transmission of information (TCI state) related to QCL. Specifically, the control unit 301 may control the QCL relationship between the downlink control channel (PDCCH or CORESET) and the downlink reference signal. Further, the control unit 301 may control mapping of the downlink control channel to a predetermined resource unit in CORESET and transmission of the downlink control channel.

In addition, the control unit 301 transmits a MAC control element (MAC CE) including a field indicating the TCI state (transmission configuration index (TCI) state) of the control resource set set in the BWP (partial band) in the carrier. You may control.

The MAC CE may include a field indicating CORESET (control resource set) (first mode). Alternatively, the MAC CE may include a field indicating the TCI state of the CORESET determined according to a predetermined rule without including the field indicating the CORESET (second mode).

In addition, the MAC CE may include a field (BWP ID field) indicating BWP (partial band) (FIGS. 2A and 3A). Alternatively, the MAC CE does not include a BWP (partial band) field (BWP ID field), and a TCI state ID field may be included in the MAC CE according to a predetermined rule (FIGS. 2B, 2C, 3B, 3C).

The transmission signal generation unit 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from the control unit 301, and outputs it to the mapping unit 303. The transmission signal generation unit 302 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present disclosure.

The transmission signal generation unit 302 generates, for example, a DL assignment for notifying downlink data allocation information and / or a UL grant for notifying uplink data allocation information based on an instruction from the control unit 301. The DL assignment and UL grant are both DCI and follow the DCI format. Further, the downlink data signal is subjected to coding processing, modulation processing, and the like according to a coding rate, a modulation scheme, and the like determined based on channel state information (CSI: Channel State Information) from each user terminal 20.

The mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined radio resource based on an instruction from the control unit 301, and outputs it to the transmission / reception unit 103. The mapping unit 303 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present disclosure.

The reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 103. Here, the received signal is, for example, an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) transmitted from the user terminal 20. The reception signal processing unit 304 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present disclosure.

The reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301. For example, when receiving PUCCH including HARQ-ACK, HARQ-ACK is output to control section 301. The reception signal processing unit 304 outputs the reception signal and / or the signal after reception processing to the measurement unit 305.

The measurement unit 305 performs measurement on the received signal. The measurement unit 305 can be configured from a measurement device, a measurement circuit, or a measurement device described based on common recognition in the technical field according to the present disclosure.

For example, the measurement unit 305 may perform RRM (Radio Resource Management) measurement, CSI (Channel State Information) measurement, and the like based on the received signal. The measurement unit 305 includes received power (for example, RSRP (Reference Signal Received Power)), received quality (for example, RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio), SNR (Signal to Noise Ratio)). Signal strength (for example, RSSI (Received Signal Strength Indicator)), propagation path information (for example, CSI), and the like may be measured. The measurement result may be output to the control unit 301.

<User terminal>
FIG. 7 is a diagram showing an example of the overall configuration of the user terminal according to the present embodiment. The user terminal 20 includes a plurality of transmission / reception antennas 201, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205. Note that the transmission / reception antenna 201, the amplifier unit 202, and the transmission / reception unit 203 may each be configured to include one or more.

The radio frequency signal received by the transmission / reception antenna 201 is amplified by the amplifier unit 202. The transmission / reception unit 203 receives the downlink signal amplified by the amplifier unit 202. The transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204. The transmission / reception unit 203 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present disclosure. The transmission / reception unit 203 may be configured as an integral transmission / reception unit, or may be configured from a transmission unit and a reception unit.

The baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, and the like on the input baseband signal. The downlink user data is transferred to the application unit 205. The application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. Also, broadcast information of downlink data may be transferred to the application unit 205.

On the other hand, uplink user data is input from the application unit 205 to the baseband signal processing unit 204. The baseband signal processing unit 204 performs transmission / reception units for retransmission control (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like. 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 transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.

Note that the transmission / reception unit 203 may further include an analog beam forming unit that performs analog beam forming. The analog beam forming unit includes an analog beam forming circuit (for example, phase shifter, phase shift circuit) or an analog beam forming apparatus (for example, phase shifter) described based on common recognition in the technical field according to the present invention. can do. Further, the transmission / reception antenna 201 can be configured by, for example, an array antenna. The transmission / reception unit 203 is configured to be able to apply single BF and multi-BF.

The transmission / reception unit 203 may transmit a signal using a transmission beam, or may receive a signal using a reception beam. The transmission / reception unit 203 may transmit and / or receive a signal using a predetermined beam determined by the control unit 401.

The transceiver 203 receives a downlink (DL) signal (including at least one of a DL data signal (downlink shared channel), a DL control signal (downlink control channel), and a DL reference signal) from the radio base station 10, Then, an uplink (UL) signal (including at least one of a UL data signal, a UL control signal, and a UL reference signal) is transmitted to the radio base station 10.

Also, the transmission / reception unit 203 receives DCI for the user terminal 20 using the downlink control channel. The transmission / reception unit 203 receives a MAC control element (MAC CE) using the downlink shared channel. Further, the transmission / reception unit 203 may receive information (QCL information) (or a TCI state indicating (including) the QCL information) related to the QCL of the downlink shared channel and / or the downlink control channel (CORESET).

FIG. 8 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment. In addition, in this example, the functional block of the characteristic part in this Embodiment is mainly shown, and it may be assumed that the user terminal 20 also has another functional block required for radio | wireless communication.

The baseband signal processing unit 204 included in the user terminal 20 includes at least 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. Note that these configurations may be included in the user terminal 20, and some or all of the configurations may not be included in the baseband signal processing unit 204.

The control unit 401 controls the entire user terminal 20. The control unit 401 can be configured by a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present disclosure.

The control unit 401 controls, for example, signal generation in the transmission signal generation unit 402, signal allocation in the mapping unit 403, and the like. The control unit 401 also controls signal reception processing in the reception signal processing unit 404, signal measurement in the measurement unit 405, and the like.

The control unit 401 acquires the downlink control signal and the downlink data signal transmitted from the radio base station 10 from the reception signal processing unit 404. The control unit 401 controls the generation of the uplink control signal and / or the uplink data signal based on the result of determining the necessity of retransmission control for the downlink control signal and / or the downlink data signal.

The control unit 401 uses a digital BF (for example, precoding) by the baseband signal processing unit 204 and / or an analog BF (for example, phase rotation) by the transmission / reception unit 203 to form a transmission beam and / or a reception beam. May be performed.

Also, the control unit 401 may control a signal reception process based on information (TCI state) regarding QCL, assuming a pseudo collocation (QCL) relationship between a plurality of signals. Specifically, the control unit 401 assumes a QCL relationship between a downlink control channel (PDCCH or CORESET) and a downlink reference signal, and controls PDCCH reception processing based on information related to the QCL (TCI state). Also good.

The control unit 401 also includes a MAC control element (TCI state ID field) indicating a TCI state (transmission configuration index (TCI) state) of a control resource set set in the BWP (partial band) in the carrier. (MAC CE) reception may be controlled.

In addition, the MAC CE may include a field (CORESET ID field) indicating CORESET (control resource set) (first mode). The control unit 401 may control the reception process of the downlink control channel in the CORESET indicated by the field based on the TCI state indicated by the TCI state ID field.

Alternatively, the MAC CE may not include a CORESET field (CORESET ID field) (second mode). The control unit 401 may identify the CORESET corresponding to the TCI state indicated by the TCI state ID field according to a predetermined rule.

In addition, the MAC CE may include a field (BWP ID field) indicating BWP (partial band). Based on this field, the control unit 401 may recognize the CORESET BWP in the TCI state indicated by the TCI state ID field (FIGS. 2A and 3A).

Also, the MAC CE may not include a field (BWP ID field) indicating BWP (partial band). The control unit 401 may identify the CORESET BWP corresponding to the TCI state indicated by the TCI state ID field according to a predetermined rule (FIGS. 2B, 2C, 3B, and 3C).

The transmission signal generation unit 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on an instruction from the control unit 401 and outputs the uplink signal to the mapping unit 403. The transmission signal generation unit 402 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present disclosure.

The transmission signal generation unit 402 generates an uplink control signal related to delivery confirmation information, channel state information (CSI), and the like based on an instruction from the control unit 401, for example. In addition, the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401. For example, the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal when the UL grant is included in the downlink control signal notified from the radio base station 10.

The mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to a radio resource based on an instruction from the control unit 401, and outputs the radio signal to the transmission / reception unit 203. The mapping unit 403 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present disclosure.

The reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 203. Here, the received signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) transmitted from the radio base station 10. The reception signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present disclosure. Further, the reception signal processing unit 404 can constitute a reception unit according to the present disclosure.

The reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401. The reception signal processing unit 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401. In addition, the reception signal processing unit 404 outputs the reception signal and / or the signal after reception processing to the measurement unit 405.

The measurement unit 405 performs measurement on the received signal. The measurement unit 405 can be configured from a measurement device, a measurement circuit, or a measurement device described based on common recognition in the technical field according to the present disclosure.

For example, the measurement unit 405 may perform RRM measurement, CSI measurement, and the like based on the received signal. The measurement unit 405 may measure reception power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like. The measurement result may be output to the control unit 401.

<Hardware configuration>
In addition, the block diagram used for description of this Embodiment has shown the block of the functional unit. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using one device physically and / or logically coupled, or directly and / or two or more devices physically and / or logically separated. Alternatively, it may be realized indirectly by connecting (for example, using wired and / or wireless) and using these plural devices.

For example, the radio base station, the user terminal, and the like in this embodiment may function as a computer that performs the processing of each aspect of this embodiment. FIG. 9 is a diagram illustrating an example of the hardware configuration of the radio base station and the user terminal according to the present embodiment. The wireless base station 10 and the user terminal 20 described above 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 “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configurations of the radio base station 10 and the user terminal 20 may be configured to include one or a plurality of each device illustrated in the figure, or may be configured not to include some devices.

For example, although only one processor 1001 is shown, there may be a plurality of processors. Further, the processing may be executed by one processor, or the processing may be executed by one or more processors simultaneously, sequentially, or using other methods. Note that 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 calculated by causing the processor 1001 to perform calculations by reading predetermined software (programs) on hardware such as the processor 1001 and the memory 1002, for example, via the communication device 1004. This is realized by controlling communication and controlling reading and / or writing of data in the memory 1002 and the storage 1003.

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

Further, the processor 1001 reads programs (program codes), software modules, data, and the like from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the present embodiment 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 operating in the processor 1001, and may be realized similarly for other functional blocks.

The memory 1002 is a computer-readable recording medium such as a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically EPROM), a RAM (Random Access Memory), or any other suitable storage medium. It may be configured by one. The memory 1002 may be called a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, and the like that can be executed to implement the wireless communication method according to the present embodiment.

The storage 1003 is a computer-readable recording medium such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM (Compact Disc ROM)), a digital versatile disk, Blu-ray® disk), removable disk, hard disk drive, smart card, flash memory device (eg, card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium It may be constituted by. The storage 1003 may be referred to as 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 referred to as 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, etc., in order to realize 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, etc.) that accepts an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Also, the devices such as the processor 1001 and the memory 1002 are connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using a different bus for each device.

The radio base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and the like. It may be configured including hardware, and a part or all of each functional block may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these hardware.

(Modification)
Note that the terms described in this specification and / or terms necessary for understanding this specification may be replaced with terms having the same or similar meaning. For example, the channel and / or symbol may be a signal (signaling). The signal may be a message. The reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot, a pilot signal, or the like depending on an applied standard. Moreover, a component carrier (CC: Component Carrier) may be called a cell, a frequency carrier, a carrier frequency, etc.

Further, the radio frame may be configured by one or a plurality of periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may be referred to as a subframe. Further, a subframe may be composed of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that does not depend on the neurology.

Furthermore, the slot may be configured by one or a plurality of symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time domain. Further, the slot may be a time unit based on the numerology. The slot may include a plurality of mini slots. Each minislot may be configured with one or more symbols in the time domain. The minislot may also be called a subslot.

Radio frame, subframe, slot, minislot, and symbol all represent time units when transmitting signals. Different names may be used for the radio frame, subframe, slot, minislot, and symbol. For example, one subframe may be called a transmission time interval (TTI), a plurality of consecutive subframes may be called a TTI, and one slot or one minislot is called a TTI. May be. That is, the subframe and / or TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. There may be. Note that a unit representing TTI may be called a slot, a minislot, or the like instead of a subframe.

Here, TTI means, for example, a minimum time unit for scheduling in wireless communication. For example, in the LTE system, a radio base station performs scheduling for assigning radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI. The definition of TTI is not limited to this.

The TTI may be a transmission time unit of a channel-encoded data packet (transport block), a code block, and / or a code word, or may be a processing unit such as scheduling or link adaptation. When a TTI is given, a time interval (for example, the number of symbols) in which a transport block, a code block, and / or a code word is actually mapped may be shorter than the TTI.

When one slot or one minislot is referred to as a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum scheduling unit. Further, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, or a long subframe. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, or a subslot.

Note that a long TTI (eg, normal TTI, subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (eg, shortened TTI) is less than the TTI length of the long TTI and 1 ms. It may be replaced with a TTI having the above TTI length.

A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain. Further, the RB may include one or a plurality of symbols in the time domain, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks. One or more RBs include physical resource blocks (PRB), sub-carrier groups (SCG), resource element groups (REG), PRB pairs, RB pairs, etc. May be called.

Further, the resource block may be configured by one or a plurality of resource elements (RE: Resource Element). For example, 1RE may be a radio resource region of 1 subcarrier and 1 symbol.

Note that the structure of the above-described radio frame, subframe, slot, minislot, symbol, etc. is merely an example. 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 the slot, the number of symbols and RBs included in the slot or minislot, and the RB The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and the like can be variously changed.

In addition, the information, parameters, and the like described in this specification may be expressed using absolute values, may be expressed using relative values from a predetermined value, or other corresponding information may be used. May be represented. For example, the radio resource may be indicated by a predetermined index.

In this specification, names used for parameters and the like are not limited names in any way. For example, various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements can be identified by any suitable name, so the various channels and information elements assigned to them. The name is not limited in any way.

The information, signals, etc. described herein may be represented using any of a variety of different technologies. For example, data, commands, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these May be represented by a combination of

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

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

The notification of information is not limited to the aspect described in this specification / this embodiment, and may be performed using other methods. For example, information notification includes 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 referred to as L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), or the like. Further, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like. The MAC signaling may be notified using, for example, a MAC control element (MAC CE (Control Element)).

In addition, notification of predetermined information (for example, notification of “being X”) is not limited to explicit notification, but implicitly (for example, by not performing notification of the predetermined information or other information) May be performed).

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

Software, whether it is called software, firmware, middleware, microcode, hardware description language, or other names, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc. should be interpreted broadly.

Also, software, instructions, information, etc. may be transmitted / received via a transmission medium. For example, software can use websites, servers using wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) , Or other remote sources, these wired and / or wireless technologies are included within the definition of transmission media.

The terms “system” and “network” used in this specification are used interchangeably.

In this specification, “base station (BS)”, “radio base station”, “eNB”, “gNB”, “cell”, “sector”, “cell group”, “carrier” and “component” The term “carrier” may be used interchangeably. A base station may also be called in terms such as a fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and small cell.

The base station can accommodate one or a plurality of (for example, 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, an indoor small base station (RRH: Remote Radio Head)) can also provide communication services. The term “cell” or “sector” refers to part or all of the coverage area of a base station and / or base station subsystem that provides communication services in this coverage.

In this specification, the terms “mobile station (MS)”, “user terminal”, “user equipment (UE)”, and “terminal” may be used interchangeably. .

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

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

Similarly, a user terminal in this specification may be read by a radio base station. In this case, the wireless base station 10 may have a function that the user terminal 20 has.

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

Each aspect / this embodiment described in this specification may be used alone, in combination, or may be switched according to execution. Further, the order of the processing procedures, sequences, flowcharts, and the like of each aspect / this embodiment described in this specification may be changed as long as there is no contradiction. For example, the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.

Each aspect described in this specification / this embodiment 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-WideBand), Bluetooth (registration) (Trademark), systems using other appropriate wireless communication methods, and / or next-generation systems extended based on them may be applied.

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

Any reference to elements using designations such as “first”, “second”, etc. as used herein does not generally limit the amount or order of those elements. These designations can be used herein as a convenient way to distinguish between two or more elements. Thus, reference to the first and second elements does not mean that only two elements can be employed or that the first element must precede the second element in some way.

As used herein, the term “determining” may encompass a wide variety of actions. For example, “determination” means calculating, computing, processing, deriving, investigating, looking up (eg, table, database or other data). It may be considered to “judge” (search in structure), ascertaining, etc. In addition, “determination (decision)” includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), access ( accessing) (e.g., accessing data in memory), etc. may be considered to be "determining". Also, “determination” is considered to be “determination (resolving)”, “selecting”, “choosing”, “establishing”, “comparing”, etc. Also good. That is, “determination (determination)” may be regarded as “determination (determination)” of some operation.

As used herein, the terms “connected”, “coupled”, or any variation thereof, is any direct or indirect connection between two or more elements or By coupling, it can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, “connection” may be read as “access”.

As used herein, when two elements are connected, using one or more wires, cables and / or printed electrical connections, and as some non-limiting and non-inclusive examples, the radio frequency domain Can be considered “connected” or “coupled” to each other, such as with electromagnetic energy having wavelengths in the microwave and / or light (both visible and invisible) regions.

In the present specification, the term “A and B are different” may mean “A and B are different from each other”. Terms such as “leave” and “coupled” may be interpreted in a similar manner.

Where the term “including”, “comprising”, and variations thereof are used in this specification or the claims, these terms are inclusive, as are the terms “comprising”. Intended to be Furthermore, the term “or” as used herein or in the claims is not intended to be an exclusive OR.

Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the present embodiment described in this specification. The present invention can be implemented as modifications and changes without departing from the spirit and scope of the present invention determined based on the description of the scope of claims. Accordingly, the description herein is for illustrative purposes and does not give any limiting meaning to the present invention.

Claims (6)

1. A receiving unit that receives a MAC (Medium Access Control) control element including a field indicating a state of a transmission configuration index (TCI) of a control resource set set in a partial band in the carrier;
   A control unit for controlling reception of a downlink control channel mapped to a predetermined resource unit in the control resource set based on the TCI state indicated by the field;
   A user terminal comprising:
2. The user terminal according to claim 1, wherein the MAC control element includes a field indicating the control resource set.
3. The MAC control element does not include a field indicating the control resource set,
   The user terminal according to claim 1, wherein the control unit identifies the control resource set according to a predetermined rule.
4. The user terminal according to any one of claims 1 to 3, wherein the MAC control element includes a field indicating the partial band.
5. The MAC control element does not include a field indicating the partial band,
   The user terminal according to any one of claims 1 to 3, wherein the control unit identifies the partial band according to a predetermined rule.
6. In the user terminal,
   Receiving a MAC (Medium Access Control) control element including a field indicating a state of a transmission configuration index (TCI) of a control resource set set in a partial band in the carrier;
   Controlling reception of a downlink control channel mapped to a predetermined resource unit in the control resource set based on the state of the TCI indicated by the field;
   A wireless communication method comprising:

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