WO2020031275A1

WO2020031275A1 - User equipment

Info

Publication number: WO2020031275A1
Application number: PCT/JP2018/029681
Authority: WO
Inventors: 高橋　秀明; 一樹武田; 浩樹原田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2018-08-07
Filing date: 2018-08-07
Publication date: 2020-02-13

Abstract

User equipment pertaining to an embodiment of the present disclosure is equipped with: a reception unit for receiving downlink control information including a predetermined field indicating a frequency domain resource to be allocated to a downlink shared channel or to an uplink shared channel; and a control unit for, on the basis of whether or not a control resource set determined on the basis of an index provided by a broadcast channel overlaps with a band determined on the basis of initial access band information provided by a higher layer, determining a bandwidth for the initial access band.

Description

User terminal

The present disclosure relates to a user terminal in a next-generation mobile communication system.

In a UMTS (Universal Mobile Telecommunications System) network, long term evolution (LTE: Long Term Evolution) has been specified for the purpose of higher data rates and lower delays (Non-Patent Document 1). Also, LTE-A (LTE Advanced, LTE @ Rel. 10, 11, 12, 13) has been specified for the purpose of further increasing the capacity and sophistication of LTE (LTE @ Rel. 8, 9).

Succession system of LTE (for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G + (plus), NR (New Radio), NX (New radio access), FX (Future generation radio access), LTE Rel. 14 or 15 or later) are also being studied.

In an existing LTE system (for example, LTE@Rel.8-14), a user terminal (UE: User @ Equipment) transmits downlink control information (DCI: Downlink @ Control @ Information) (downlink) from a base station (for example, eNB: eNodeB). It controls reception of a downlink shared channel (for example, PDSCH: Physical {Downlink} Shared} Channel) based on a link (DL: Downlink) assignment or the like.

ユーザ Also, the user terminal controls transmission of an uplink shared channel (for example, PUSCH: Physical Uplink Shared Channel) based on DCI (also referred to as uplink (UL) grant) from the base station. Note that DCI is one of the control signals of the physical layer, and is transmitted to the user terminal using a downlink control channel (for example, PDCCH (Physical Downlink Control Channel)).

In a future wireless communication system (for example, NR, 5G, 5G +, Rel. 15 or later), a carrier (for example, 100 to 400 MHz) having a wider bandwidth than the carrier (for example, up to 20 MHz) of the existing LTE system is used. It is assumed that For this reason, it has been studied to set one or more bands in the carrier for the user terminal and perform communication using at least one of the one or more bands. A partial band in the carrier is called, for example, a bandwidth portion (BWP: Bandwidth @ part) or the like.

In addition, in the future wireless communication system, provision of a BWP for initial access (also referred to as an initial BWP or the like) in a carrier is being studied. In this case, the user terminal determines at least one of the reception of the downlink shared channel (eg, PDSCH: Physical Downlink Shared Channel) and the transmission of the uplink shared channel (eg, PUSCH: Physical Uplink Shared Channel) allocated in the initial BWP. The problem is how to control it.

The present invention has been made in view of the above, and has as its object to provide a user terminal capable of appropriately controlling at least one of reception of a downlink shared channel and transmission of an uplink shared channel allocated in an initial BWP. One.

A user terminal according to an aspect of the present disclosure is configured to determine based on a receiving unit that receives downlink control information including a predetermined field indicating a frequency domain resource allocated to a downlink shared channel or an uplink shared channel, and an index given by a broadcast channel. A control unit that determines the bandwidth of the initial access band based on whether the control resource set to be overlapped with the band determined based on the information on the initial access band given by the upper layer, Is provided.

According to an aspect of the present disclosure, it is possible to appropriately control at least one of reception of a downlink shared channel and transmission of an uplink shared channel allocated in the initial BWP.

FIG. 1 is a diagram illustrating an example of determination of a bandwidth of an initial BWP based on MIB. FIG. 2 is a diagram illustrating an example of determining an initial BWP bandwidth based on SIB1. FIG. 3 is a diagram illustrating an example of determining the number of bits of the frequency domain resource allocation field in the DL assignment according to the first example. FIG. 4 is a diagram illustrating an example of determining the number of bits of the frequency domain resource allocation field in the UL grant according to the first example. FIG. 5 is a diagram illustrating an example of control of bit selection in rate matching according to the second example. FIG. 6 is a diagram illustrating an example of a schematic configuration of the wireless communication system according to the present embodiment. FIG. 7 is a diagram showing an example of the overall configuration of the base station according to the present embodiment. FIG. 8 is a diagram showing an example of a functional configuration of the base station according to the present embodiment. FIG. 9 is a diagram showing an example of the overall configuration of the user terminal according to the present embodiment. FIG. 10 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment. FIG. 11 is a diagram illustrating an example of a hardware configuration of the base station and the user terminal according to the present embodiment.

In future wireless communication systems (eg, NR, 5G, 5G +, Rel. 15 or later), carriers (eg, 20 MHz) with a wider bandwidth than carriers (eg, 20 MHz) of existing LTE systems (eg, Rel. 8-13) , 100 to 400 MHz). For this reason, it has been studied to set one or more bands in the carrier for the user terminal and perform communication using at least one of the one or more bands.

The carrier is also called a component carrier (CC: Component @ Carrier), a cell, a serving cell, a system bandwidth, or the like. A partial band in the carrier is called, for example, a bandwidth portion (BWP: Bandwidth @ part). The BWP may include a BWP for uplink (uplink BWP) and a BWP for downlink (downlink BWP).

For example, for a user terminal, one or more BWPs (at least one of one or more uplink BWPs and one or more downlink BWPs) may be set, and at least one of the set BWPs may be activated. The activated BWP is also called an active BWP or the like.

Ｂ Also, a BWP for initial access (initial BWP (initial @ BWP)) may be set for the user terminal. The initial BWP may include at least one of an initial BWP for downlink (initial downlink BWP (initial @ downlink @ BWP)) and an initial BWP for uplink (initial uplink BWP (initial @ uplink @ BWP)).

In the initial access, for example, at least one of detection of a synchronization signal, acquisition of broadcast information (for example, a master information block (MIB: Master Information Block)), and establishment of a connection by random access may be performed.

The bandwidth of the initial BWP is set to an index (also referred to as pdcch-ConfigSIB1, RMSI-PDCCH-Config, ControlResourceSetZero, etc.) in the MIB transmitted via a broadcast channel (PBCH: Physical Broadcast Channel, also referred to as P-BCH, etc.). It may be set based on this.

FIG. 1 is a diagram illustrating an example of determining a bandwidth of an initial BWP based on an index in the MIB. As shown in FIG. 1, the MIB includes configuration information (also referred to as pdcch-ConfigSIB1, RMSI-PDCCH-Config, etc.) on the PDCCH for system information (for example, SIB1: System Information Block 1, RMSI: Remaining Minimum System Information). May be included.

$ Pdcch-ConfigSIB1 may include at least one of information (ControlResourceSetZero) related to a predetermined control resource set (CORESET: Control @ Resource @ Set) and information (SearchSpaceZero) related to a predetermined search space. Here, CORESET is a candidate area for assignment of a downlink control channel (for example, PDCCH (Physical Downlink Control Channel)).

ControlResourceSetZero is, for example, a predetermined number of bits (for example, 4 bits) associated with at least one of information (for example, a bandwidth (number of resource blocks) of CORESET # 0, a number of symbols, an offset, etc.) used for determining CORESET # 0. Index).

The coreset # 0 is, for example, a coreset for SIB1 (or RMSI), and is used for scheduling of a downlink shared channel (for example, PDSCH: Physical Downlink Shared Channel) for transmitting SIB1, but a PDCCH (or DCI) is arranged. May be a reset. Coreset # 0 is a coreset for SIB1, a controlResourceSetZero, a common coreset (common @ coreset), a common coreset # 0, a cell-specific coreset, and a type-0 PDCCH common search space (Type0-PDCCH @ common @ search @ space). Also referred to as CORESET.

SearchSpaceZero includes, for example, information used for determining search space # 0 (for example, predetermined parameters M and O used for determining a slot in which search space # 0 is arranged, the number of search space sets per slot, The index may be a predetermined number of bits (for example, an index of 4 bits) associated with at least one of a symbol index and the like.

The search space # 0 is, for example, a search space for SIB1 (or RMSI), and may include a PDCCH candidate used for scheduling the PDSCH for transmitting SIB1. The search space # 0 is also called a common search space, a type 0 PDCCH common search space, a PDCCH monitoring opportunity (monitoring @ occasions), a search space for SIB1, a search space for RMSI, and the like.

For example, in FIG. 1, the user terminal is associated with an index indicated by a predetermined bit (for example, the most significant 4 bits (MSB: Most Significant bit) or the least significant 4 bits (LSB: Least Significant bit)) of ControlResourceSetZero or pdcch-ConfigSIB1. The number of resource blocks (RBs) (N ^CORESET _RB ) to be ^allocated may be determined as the bandwidth of the initial BWP. In FIG. 1, the bandwidth (the number of RBs) of the initial BWP is determined to be 24, 48, or 96.

In addition, the value associated with the index in FIG. 1 is only an example, and is not limited to the illustrated value. For example, each value may be changed based on at least one of a minimum channel bandwidth (minimum channel bandwidth) and a subcarrier interval (subcarrier spacing). Further, the hierarchical structure of the parameters in the MIB shown in FIG. 1 is merely an example, and is not limited to the illustrated one.

{In addition, the bandwidth of the initial BWP may be rephrased as the number of RBs (bandwidth) constituting a predetermined CORESET (for example, the above-mentioned CORESET # 0). One or more search spaces (for example, the search space # 0, type 0 PDCCH common search space) may be associated with the predetermined CORESET.

As described above, the bandwidth of the initial BWP determined based on the index (predetermined bit (for example, 4 MSB or 4 LSB) of ControlResourceSetZero or pdcch-ConfigSIB1) in the MIB is three bandwidths of 24, 48, and 90. May be limited. Depending on the capability of the user terminal (UE @ capability), the user terminal is also assumed to support only 1 BWP, so it is not desirable that the bandwidth of the initial BWP is limited to the three bandwidths.

Therefore, designating the bandwidth of the initial BWP based on SIB1 is also being studied. The user terminal monitors (blind) a predetermined CORESET (for example, RESET # 0) determined based on an index (a predetermined bit (for example, 4MSB or 4LSB) of the ControlResourceSetZero or pdcch-ConfigSIB1) in the MIB. Decoding) to detect DCI, and receive SIB1 using the PDSCH scheduled by the DCI. Also, the user terminal monitors (blind decodes) a search space (for example, search space # 0) determined based on an index (SearchSpaceZero or a predetermined bit (for example, 4MSB or 4LSB) of pdcch-ConfigSIB1) in the MIB. The DCI may be detected in this way.

FIG. 2 is a diagram illustrating an example of determination of an initial BWP bandwidth based on SIB1. As shown in FIG. 2, the SIB1 includes information (position / bandwidth information, identification) used for determining at least one of the frequency domain position (frequency @ domain @ location) and the bandwidth (position / bandwidth) of the initial BWP. For example, locationAndBandwidth) may be included. locationAndBandwidth may be composed of a predetermined number of bits (for example, 15 bits).

The user terminal may determine the bandwidth (the number of RBs) of the initial BWP based on at least one bit of locationAndBandwidth. For example, the user terminal may determine the number of RBs associated with the index indicated by at least one bit of locationAndBandwidth as a bandwidth of the initial BWP in a table that associates at least a predetermined index with the number of RBs.

(4) The user terminal may determine the position of the initial BWP frequency domain based on at least one bit of locationAndBandwidth. The position of the frequency domain is determined by the distance (the number of RBs) from the lowest subcarrier (point A) of the reference resource block (reference resource block (reference resource block), common RB0, etc.) in the carrier. ). The user terminal may determine the position of the frequency domain of the initial BWP based on the distance specified by at least one bit of locationAndBandwidth.

ＳＩAs shown in FIG. 2, SIB1 may include cell-specific parameter setting information (for example, ServingCellConfigCommon). ServingCellConfigCommon may include information on the initial downlink BWP (for example, initialDownlinkBWP). For initialDownlinkBWP, a cell-specific common parameter (BWP-DownlinkCommon) may be provided. The BWP-DownlinkCommon may include the above-mentioned locationAndBandwidth and the like.

The user terminal may determine the position / bandwidth of the initial downlink BWP based on the locationAndBandwidth in the BWP-DownlinkCommon provided for the initialDownlinkBWP.

Serv Also, the ServingCellConfigCommon may include common configuration information of the uplink (for example, UplinkConfigCommon). UplinkConfigCommon may include information on the initial uplink BWP (for example, initialUplinkBWP). For initialUplinkBWP, a cell-specific common parameter (eg, BWP-UplinkCommon) may be provided. The BWP-UplinkCommon may include the above-mentioned locationAndBandwidth and the like.

The user terminal may determine the position / bandwidth of the initial uplink BWP based on the locationAndBandwidth in the BWP-UplinkCommon provided for the initialUplinkBWP.

The hierarchical structure of the parameters shown in FIG. 2 is merely an example, and is not limited to the illustrated one. For example, in FIG. 2, information about the initial downlink BWP (for example, BWP-DownlinkCommon given for initialDownlinkBWP) is included in ServingCellConfigCommon, but what information item (IE: Information @ Element) of what hierarchy in SIB1 May be included. Further, the position / bandwidth information (for example, locationAndBandwidth) of the initial downlink BWP is included in the BWP-DownlinkCommon provided for the initialDownlinkBWP, but may be included in any IE of any hierarchy.

情報 In addition, information on the initial uplink BWP (for example, BWP-UplinkCommon given for initialUplinkBWP) is included in UplinkConfigCommon in ServingCellConfigCommon, but may be included in any IE of any hierarchy in SIB1. Further, the position / bandwidth information (for example, locationAndBandwidth) of the initial uplink BWP is included in the BWP-UplinkCommon provided for the initialUplinkBWP, but may be included in any IE of any hierarchy.

The BWP for which the position / bandwidth is determined based on the locationAndBandwidth may be called BWP # 0, initial BWP, or the like.

As described above, when the information on the initial BWP is included in the SIB1 (for example, at least one of the BWP-DownlinkCommon for the initialDownlinkBWP and the BWP-UplinkCommon for the initialUplinkBWP), as the initial BWP, based on the pdcch-ConfigSIB1 in the MIB. There may be both a determined band (CORESET # 0) and a band (BWP # 0) determined based on locationAndBandwidth in SIB1.

For this reason, the user terminal receives the PDSCH in the initial downlink BWP / initial uplink BWP and performs PUSCH based on which of the RESET # 0 based on the pdcch-ConfigSIB1 in the MIB and the BWP # 0 based on the locationAndBandwidth in the SIB1. The problem is how to control at least one of the transmissions.

A similar problem occurs not only when the location / bandwidth information (for example, locationAndBandwidth) is included in the SIB1 but also for a radio resource control (RRC: Radio @ Resource @ Control) message (for example, an RRC reconfiguration (reconfiguration) message). ) May occur.

Therefore, when information on the initial BWP (for example, at least one of BWP-DownlinkCommon for initialDownlinkBWP and BWP-UplinkCommon for initialUplinkBWP) is provided by the upper layer, the user terminal performs position / bandwidth information (for example, locationAndBandwidth). The control of at least one of PDSCH reception and PUSCH transmission in the initial downlink BWP / initial uplink BWP based on the position / bandwidth of BWP # 0 determined based on the above is considered.

However, it is assumed that the bandwidth of the BWP # 0 is wider than the bandwidth (for example, 24, 48, 96 RB) determined based on pdcch-ConfigSIB1 in the MIB. Therefore, when the information on the initial BWP is given by the upper layer, if the position / bandwidth of BWP # 0 is determined uniformly, a bandwidth wider than necessary for the initial BWP is determined, and as a result, the entire carrier is used. Efficiency may be reduced.

Therefore, the present inventor determines whether CORESET # 0 determined based on pdcch-ConfigSIB1 in the MIB overlaps BWP # 0 determined based on information on the initial BWP given by the upper layer. The idea was to determine the bandwidth of the initial BWP based on whether or not.

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

In the present embodiment, when the user terminal determines that RESET # 0 determined based on pdcch-ConfigSIB1 in the MIB does not overlap with BWP # 0 determined based on information on the initial BWP provided by the upper layer, The position / bandwidth of the BWP # 0 may be determined as the position / bandwidth of the initial BWP.

On the other hand, if the RESET # 0 determined based on the pdcch-ConfigSIB1 in the MIB overlaps the BWP # 0 determined based on the information on the initial BWP given by the upper layer, the position of the initial BWP As the / bandwidth, the position / bandwidth of the CORRESET # 0 may be determined.

In the present embodiment, "CORESET # 0 determined based on pdcch-ConfigSIB1 in MIB overlaps with BWP # 0 determined based on information on initial BWP given by an upper layer" , CORRESET # 0 may overlap with the position / bandwidth of BWP # 0. Further, when the position of CORRESET # 0 and the position of BWP # 0 overlap, the positions of both do not need to completely match, and it is sufficient that at least a part of them overlaps. Further, the bandwidth of CORESET # 0 and the bandwidth of BWP # 0 may be the same or different.

{Also, "whether or not information on the initial BWP is provided by the upper layer" may be paraphrased as "whether or not the information on the initial BWP is included in at least one of the SIB1 and the RRC message." The RRC message includes a handover procedure, a procedure for adding a primary secondary cell (PSCell: Primary Secondary Cell) in dual connectivity (DC: Dual Connectivity), and a secondary cell (SCell: Secondary) in DC or carrier aggregation (CA: Carrier Aggregation). Cell) may be transmitted in at least one of the additional procedures.

When the RRC message is transmitted in the handover procedure, the information on the initial BWP may be information on the initial BWP in the cell (target cell) of the handover destination. Further, when the RRC message is transmitted in a PSCell or SCell adding procedure, the information on the initial BWP may be information on the initial BWP in the added PSCell or SCell.

In the following, the “information on the initial BWP” is at least one of BWP-DownlinkCommon for initialDownlinkBWP and BWP-UplinkCommon for initialUplinkBWP, but is not limited to this. The “information on the initial BWP” may be any information as long as the information includes at least one of the position / bandwidth information of the initial downstream BWP and the position / bandwidth information of the initial upstream BWP.

(First aspect)
In the first aspect, determination of the number of bits of a predetermined field (for example, Frequency domain resource assignment) in DCI will be described.

For example, a predetermined field (eg, Frequency @ domain @ resource @ assignment) in DCI (DL assignment, DCI format 1_0 or 1_1) may specify a frequency domain resource (Frequency @ domain @ resource) to be assigned to the PDSCH in the initial downlink BWP. is assumed. It is assumed that the number of bits of the predetermined field is determined based on the bandwidth of the initial downlink BWP.

{Similarly, it is assumed that a predetermined field (for example, Frequency domain resource allocation) in DCI (UL grant, DCI format 0_0 or 0_1) specifies a frequency domain resource allocated to the PUSCH in the initial uplink BWP. It is assumed that the number of bits of the predetermined field is determined based on the bandwidth of the initial uplink BWP.

In the first aspect, the user terminal determines whether the position / bandwidth of CORRESET # 0 determined based on the index (for example, pdcch-ConfigSIB1) in the MIB is information on the initial BWP (band for initial access) (for example, A predetermined field indicating a frequency domain resource allocated to the PDSCH or PUSCH in DCI based on whether or not it overlaps with a position / bandwidth determined based on BWP-DownlinkCommon for initialDownlinkBWP or BWP-UplinkCommon for initialUplinkBWP May be determined.

In the following, the predetermined field is referred to as a frequency domain resource assignment field (Frequency domain resource allocation), but the name of the predetermined field is not limited to this. Further, the first embodiment may be used alone or in combination with another embodiment. Further, the control of the first aspect may be performed not only by the user terminal (eg, UE) but also by a base station (eg, eNB, gNB: gNodeB, TRP: Transmission \ Reception \ Point).

In the first aspect, the user terminal is provided with information on the initial BWP by the upper layer, and the position / bandwidth of the RESET # 0 determined based on an index in the MIB is information on the initial BWP. Based on the bandwidth provided by the location / bandwidth information (eg, locationAndBandwidth) in the information on the initial BWP, if it does not overlap with the location / bandwidth determined based on The number of bits may be determined.

On the other hand, in cases other than the above, the user terminal determines the number of bits of the frequency domain resource allocation field in DCI based on the bandwidth given by the index (predetermined bits of controlResourceSetZero or pdcch-ConfigSIB1) via the PBCH. You may.

The case other than the above may be any of the following cases:
If no information about the initial BWP is given by the upper layer,
Information on the initial BWP is given by the upper layer, and the position / bandwidth of CORRESET # 0 determined based on the index in the MIB is determined based on the information on the initial BWP / When overlapping with bandwidth.

Here, the DCI including the frequency domain resource allocation field may be a DCI (DL assignment) used for PDSCH scheduling or a DCI (UL grant) used for PUSCH scheduling. .

<Control of Number of Bits in Frequency Domain Resource Allocation Field in DL Assignment>
FIG. 3 is a diagram illustrating an example of determining the number of bits of the frequency domain resource assignment field in the DL assignment according to the first example. The DL assignment may include at least one of DCI format 1_0 and DCI format 1_1. In FIG. 3, DCI format 1_0 is shown as an example of the DL assignment, but any DCI used for PDSCH scheduling may be used.

{The DCI format 1_0 in FIG. 3 may include (include) a cyclic redundancy check (CRC) bit scrambled by a predetermined identifier (CRC may be scrambled). The predetermined identifier is, for example, C-RNTI (Cell-Radio Network Temporary Identifier), P-RNTI (paging-RNTI), SI-RNTI (System Information-RNTI), RA-RNTI (Random Access-RNTI), and TC -At least one of RNTI (Temporary @ Cell-RNTI).

As shown in FIG. 3, the frequency resources allocated to the PDSCH in the bandwidth NDL ^{and BWP} _RB of the initial downlink BWP are specified by the frequency domain resource allocation field of DCI format 1_0.

Note that the allocation of frequency resources to PDSCH in FIG. 3 is merely an example, and discontinuous frequency resources may be allocated to PDSCH. The frequency resource allocation unit may be an RB or a resource block group (RB) including one or more RBs.

As shown in FIG. 3, the number of bits of the frequency domain resource allocation field may be determined based on the bandwidth NDL ^{and BWP} _RB of the initial downlink BWP. For example, in FIG. 3, the number of bits is determined based on the following equation (1).

Here, the BWP-DownlinkCommon (information on the initial access band) for the initialDownlinkBWP is given by the upper layer, and the position / bandwidth of CORRESET # 0 is determined by the locationAndBandwidth (position / bandwidth information) of the BWP-DownlinkCommon. If it does not overlap with the given location / bandwidth ^{, NDL, BWP} _RB in equation (1) may be the bandwidth given by the locationAndBandwidth of the BWP-DownlinkCommon. Note that the determination of the bandwidth based on at least one bit configuring locationAndBandwidth is as described above.

On the other hand, if BWP-DownlinkCommon for initialDownlinkBWP is not provided by the upper layer, or BWP-DownlinkCommon for initialDownlinkBWP is provided by the upper layer, the position / bandwidth of CORRESET # 0 is determined by the locationAndBandwidth of the BWP-DownlinkCommon. If it overlaps with the given position / bandwidth, NDL ^{, BWP} _RB in equation (1) is the bandwidth given by the index (such as controlResourceSetZero or a predetermined bit of pdcch-ConfigSIB1) transmitted via PBCH, Is also good. The determination of the bandwidth based on at least one bit constituting the index in the MIB is as described above.

In this way, the user terminal performs DL assignment based on whether the position / bandwidth of CORRESET # 0 overlaps the position / bandwidth given by locationAndBandwidth of BWP-DownlinkCommon for initialDownlinkBWP given by the upper layer. The number of bits of the frequency domain resource allocation field in the comment may be determined.

Note that "the BWP-DownlinkCommon for the initialDownlinkBWP is given by the upper layer" may be paraphrased as a case where at least one of the SIB1 and the RRC message includes the BWP-DownlinkCommon for the initialDownlinkBWP. The hierarchical structure of BWP-DownlinkCommon in SIB1 is exemplified in FIG. 2, for example, but is not limited to this. Further, the RRC message may be an RRC message (for example, an RRC reconfiguration message (RRCReconfiguration @ message)) transmitted in at least one of the handover procedure, the PSCell addition procedure, and the SCell addition procedure.

Also, the above equation (1) is merely an example, and the number of bits in the frequency domain resource allocation field may be determined using a method other than the above equation (1). For example, when the DCI format 1_0, which is CRC-scrambled by P-RNTI, transmits a short message, the number of bits in the frequency domain resource allocation field may be determined based on the following equation (2).

<Control of Number of Bits in Frequency Domain Resource Allocation Field in UL Grant>
FIG. 4 is a diagram illustrating an example of determining the number of bits of the frequency domain resource allocation field in the UL grant according to the first example. The UL grant may include at least one of DCI format 0_0 and DCI format 0_1. In FIG. 4, DCI format 0_0 is shown as an example of the UL grant, but any DCI used for PUSCH scheduling may be used.

ＤＣ Also, the DCI format 0_0 in FIG. 4 may be CRC-scrambled by a predetermined identifier. The predetermined identifier may be, for example, at least one of C-RNTI and TC-RNTI.

As shown in FIG. 4, the frequency resources allocated to the PUSCH in the bandwidth N ^{UL, BWP} _RB of the initial uplink BWP are specified by a frequency domain resource allocation field of DCI format 0_0.

Note that the allocation of frequency resources to PUSCH in FIG. 4 is merely an example, and discontinuous frequency resources may be allocated to PUSCH. The frequency resource allocation unit may be an RB or a resource block group (RB) including one or more RBs.

As illustrated in FIG. 4, the number of bits of the frequency domain resource allocation field may be determined based on the initial uplink BWP bandwidth N ^{UL, BWP} _RB . For example, in FIG. 4, the number of bits is determined based on the following equation (3).

Here, BWP-UplinkCommon (information on the initial access band) for initialUplinkBWP is given by the upper layer, and the position / bandwidth of CORRESET # 0 is determined by the locationAndBandwidth (position / bandwidth information) of the BWP-UplinkCommon. If it does not overlap with the given location / bandwidth, NUL ^{, BWP} _RB in equation (3) may be the bandwidth given by the locationAndBandwidth of the BWP-UplinkCommon. Note that the determination of the bandwidth based on at least one bit configuring locationAndBandwidth is as described above.

On the other hand, when the BWP-UplinkCommon for initialUplinkBWP is not provided by the upper layer, or the BWP-UplinkCommon for initialUplinkBWP is provided by the upper layer, the position / bandwidth of CORRESET # 0 is determined by the locationAndBandwidth of the BWP-UplinkCommon. If it overlaps with the given position / bandwidth, NUL ^{, BWP} _RB in equation (3) is the bandwidth given by the index (such as a predetermined bit of controlResourceSetZero or pdcch-ConfigSIB1) transmitted via PBCH, Is also good. The determination of the bandwidth based on at least one bit constituting the index in the MIB is as described above.

In this way, the user terminal can determine whether the location / bandwidth of CORRESET # 0 overlaps with the location / bandwidth given by locationAndBandwidth of BWP-UplinkCommon for initialUplinkBWP given by the upper layer, May be determined in the frequency domain resource allocation field.

Incidentally, “the upper layer gives BWP-UplinkCommon for initialUplinkBWP” may be paraphrased as a case where at least one of the SIB1 and the RRC message includes BWP-UplinkCommon for initialUplinkBWP. The hierarchical structure of BWP-UplinkCommon in SIB1 is exemplified in FIG. 2, for example, but is not limited to this. Further, the RRC message may be an RRC message (for example, an RRC reconfiguration message) transmitted in at least one of the handover procedure, the PSCell addition procedure, and the SCell addition procedure.

式 Also, the above equation (3) is merely an example, and the number of bits in the frequency domain resource allocation field may be determined using a formula other than the above equation (3).

As described above, in the first embodiment, the position / bandwidth of CORRESET # 0 is based on information on the initial BWP (initial access band) (for example, BWP-DownlinkCommon for initialDownlinkBWP or BWP-UplinkCommon for initialUplinkBWP). The number of bits in the frequency domain resource allocation field in DCI is determined based on whether or not the position / bandwidth of BWP # 0 is determined by the above method. Therefore, reception of PDSCH allocated by initial BWP or PUSCH Transmission can be properly controlled.

(Second aspect)
In the second mode, control of bit selection in rate matching will be described.

For example, in the future wireless communication system described above, bit selection (bit selection) in rate matching (e.g., rate matching for low-density parity-check code (LDCP)) is also required. It is assumed that the bandwidth of the initial downlink BWP / initial uplink BWP is used.

In the second example, the user terminal determines whether the position / bandwidth of CORRESET # 0 determined based on the index (for example, pdcch-ConfigSIB1) in the MIB is information on the initial BWP (initial access band) (for example, Bit selection in PDSCH or PUSCH rate matching may be controlled based on whether or not the position / bandwidth is determined based on BWP-DownlinkCommon for initialDownlinkBWP or BWP-UplinkCommon for initialUplinkBWP.

２ In the second embodiment, the description will focus on the differences from the first embodiment. Further, the second aspect may be used alone or in combination with another aspect. Further, the control of the second aspect may be performed by a base station.

In the second aspect, the user terminal is provided with information on the initial BWP by the upper layer, and the position / bandwidth of the RESET # 0 determined based on an index in the MIB is information on the initial BWP. Based on the bandwidth provided by the location / bandwidth information (eg, locationAndBandwidth) in the information on the initial BWP, the bit selection in the PDSCH or PUSCH rate matching if not overlapping with the location / bandwidth determined based on May be controlled.

On the other hand, in cases other than the above, the user terminal may control bit selection in PDSCH or PUSCH rate matching based on the bandwidth provided by an index (predetermined bits of controlResourceSetZero or pdcch-ConfigSIB1) via the PBCH. Good.

Here, the bit selection in the rate matching means that a predetermined length of a circular buffer (circular buffer) in which an encoded bit sequence is stored is allocated to a resource allocated for transmission (for example, one or more allocated to a PDSCH or a PUSCH). May be a method of selecting a predetermined number of bits (for example, consecutive bits) matching the number of available resource elements (RE: Resource @ Element) in the RBs.

Note that the rate matching may be, for example, rate matching for LDCP.

FIG. 5 is a diagram illustrating an example of control of bit selection in rate matching according to the second example. Note that the bit selection in the rate matching illustrated in FIG. 5 may be applied to rate matching of data (also referred to as a transport block or a code block) transmitted on any of the PDSCH and the PUSCH allocated to the initial BWP. Good.

As shown in FIG. 5, a bit sequence of bits N (for example, output bits from an LDCP encoder) d ₀ , d ₁ ,..., D _N−1 after encoding is written into a circular buffer having a predetermined length. It is. The number of bits E retrieved from the circular buffer may be determined based on the initial BWP bandwidth.

<Bit selection for DL-SCH rate matching>
Bit selection in rate matching of DL-SCH (Downlink shared channel), which is a transport channel mapped to PDSCH, will be described in detail.

In the bit selection in the DL-SCH rate matching, BWP-DownlinkCommon (information on the initial access band) for initialDownlinkBWP is given by the upper layer, and the position / bandwidth of CORRESET # 0 is the locationAndBandwidth of the BWP-DownlinkCommon. If the position / bandwidth does not overlap with the position / bandwidth given by (position / bandwidth information), the number of bits E taken out of the circular buffer in FIG. 5 may be determined based on the bandwidth given by locationAndBandwidth of the BWP-DownlinkCommon. Good.

On the other hand, when the BWP-DownlinkCommon for initialDownlinkBWP is not provided by the upper layer, or the BWP-DownlinkCommon for initialDownlinkBWP is provided by the upper layer, the position / bandwidth of CORRESET # 0 is determined by the locationAndBandwidth of the BWP-DownlinkCommon. When overlapping with the given position / bandwidth, the number of bits E extracted from the circular buffer in FIG. 5 is determined by the bandwidth given by an index (such as controlResourceSetZero or a predetermined bit of pdcch-ConfigSIB1) in the MIB transmitted via the PBCH. It may be determined based on the width.

<UL-SCH rate matching bit selection>
Bit selection in rate matching of a UL-SCH (Uplink shared channel), which is a transport channel mapped to the PUSCH, will be described in detail.

In the bit selection in the rate matching of the UL-SCH, BWP-UplinkCommon (information on the initial access band) for the initialUplinkBWP is given by the upper layer, and the position / bandwidth of CORRESET # 0 is the locationAndBandwidth of the BWP-UplinkCommon. If it does not overlap with the position / bandwidth given by (specific information), the number of bits E taken out from the circular buffer of FIG. 5 may be determined based on the bandwidth given by the locationAndBandwidth of the BWP-UplinkCommon.

On the other hand, when BWP-UplinkCommon for initialUplinkBWP is not provided by the upper layer, or BWP-UplinkCommon for initialUplinkBWP is provided by the upper layer, the position / bandwidth of CORRESET # 0 is determined by the locationAndBandwidth of the BWP-UplinkCommon. If it overlaps with the given position / bandwidth, the number of bits E retrieved from the circular buffer in FIG. 5 is based on the bandwidth given by the index (such as controlResourceSetZero or predetermined bits of pdcch-ConfigSIB1) transmitted over the PBCH. May be determined.

As described above, in the second embodiment, the position / bandwidth of CORRESET # 0 is based on information on the initial BWP (initial access band) (for example, BWP-DownlinkCommon for initialDownlinkBWP or BWP-UplinkCommon for initialUplinkBWP). Since the bit selection is controlled based on whether or not the position / bandwidth overlaps with the determined position / bandwidth, the user terminal can appropriately control the rate matching of the PDSCH or PUSCH allocated to the initial BWP.

(Other aspects)
Note that, in the first and second aspects, "the position / bandwidth of CORRESET # 0 is information on the initial BWP (initial access band) (for example, BWP-DownlinkCommon for initialDownlinkBWP or BWP-UplinkCommon for initialUplinkBWP)" The bandwidth for the initial BWP based on whether it overlaps with the location / bandwidth determined based on the DCI is CRC scrambled by a specific RNTI (eg, P-RNTI or SI-RNTI) It may be applied in cases.

If the DCI is CRC-scrambled by another RNTI (eg, C-RNTI, RA-RNTI or TC-RNTI), the determination of the bandwidth for the initial BWP may be determined based on other conditions. The other condition may be, for example, at least one of the following:
For example, whether information on the initial BWP is given by the upper layer,
-Whether the user terminal is in the RRC connected state.

As described above, the condition used for determining the initial BWP may be changed based on the type of the RNTI in which the DCI is CRC-scrambled.

For example, when the DL assignment (eg, DCI format 1_0) is CRC-scrambled by the P-RNTI or the SI-RNTI, the user terminal sets “the position / bandwidth of CORESET # 0 for the initialDownlinkBWP given by the upper layer. Whether it overlaps with the position / bandwidth given by locationAndBandwidth of BWP-DownlinkCommon ", the number of bits of the frequency domain resource allocation field in the DL assignment may be determined.

The DL assignment (for example, DCI format 1_0) CRC-scrambled by P-RNTI or SI-RNTI is used for scheduling downlink information (for example, paging or SIB) having a relatively small data amount. For this reason, when the DL assignment is CRC-scrambled by the P-RNTI or the SI-RNTI, as described above, “the position / bandwidth of CORRESET # 0 is determined by the position / bandwidth determined based on the information on the initial BWP. By determining the size (bandwidth) of the initial BWP based on whether or not the bandwidth overlaps with the bandwidth, it is possible to prevent a reduction in the utilization efficiency of the entire carrier.

(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 any of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

FIG. 6 is a diagram showing an example of a schematic configuration of the wireless communication system according to the present embodiment. In the wireless communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a unit of a system bandwidth (for example, 20 MHz) of an LTE system 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), and 5G. (5th generation mobile communication system), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or a system for realizing these.

The wireless communication system 1 includes a base station 11 forming a macro cell C1 having relatively wide coverage, and a base station 12 (12a to 12c) arranged in the macro cell C1 and forming a small cell C2 smaller than the macro cell C1. Have. Further, user terminals 20 are arranged in the macro cell C1 and each small cell C2. The arrangement, number, and the like of each cell and the user terminals 20 are not limited to the modes shown in the figure.

The user terminal 20 can be connected to both the base station 11 and the base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 simultaneously using CA or DC. Further, the user terminal 20 may apply CA or DC using a plurality of cells (CC).

Communication between the user terminal 20 and the 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, between the user terminal 20 and the base station 12, a carrier having a relatively high frequency band (for example, 3.5 GHz, 5 GHz, or the like) and a wide bandwidth may be used, or between the user terminal 20 and the base station 11. The same carrier as described above may be used. Note that the configuration of the frequency band used by each base station is not limited to this.

The user terminal 20 can perform communication using time division duplex (TDD: Time Division Duplex) and / or frequency division duplex (FDD: Frequency Division Duplex) in each cell. In each cell (carrier), a single numerology may be applied, or a plurality of different numerologies 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, specific filtering processing performed by the transceiver in the frequency domain, specific windowing processing performed by the transceiver in the time domain, and the like. For example, for a certain physical channel, if the subcarrier intervals of the constituent OFDM symbols are different and / or if the number of OFDM symbols is different, the numerology may be referred to as different.

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

The base station 11 and each base station 12 are respectively connected to the upper station apparatus 30, and are connected to the core network 40 via the upper station apparatus 30. Note that the higher 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 base station 12 may be connected to the higher station apparatus 30 via the base station 11.

The base station 11 is a base station having 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 base station 12 is a base station having local coverage, such as 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 a transmission / reception point. May be called. Hereinafter, when the

base stations

11 and 12 are not distinguished, they are collectively referred to as a base station 10.

Each user terminal 20 is a terminal corresponding to various communication systems such as LTE and LTE-A, and may include not only mobile communication terminals (mobile stations) but also fixed communication terminals (fixed stations).

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

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 for communication. The SC-FDMA divides a system bandwidth into bands constituted by one or continuous resource blocks for each terminal, and a single carrier transmission that reduces interference between terminals by using different bands for a plurality of 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, as a downlink channel, a downlink shared channel (PDSCH: Physical Downlink Shared Channel), a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel and the like shared by each user terminal 20 are used. Used. The PDSCH transmits user data, upper layer control information, SIB (System @ Information @ Block), and the like. Also, MIB (Master \ Information \ Block) is transmitted by PBCH.

Downlink L1 / L2 control channels include PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel) and the like. Downlink control information (DCI: Downlink Control Information) including scheduling information of PDSCH and / or PUSCH is transmitted by PDCCH.

スケジューリング The scheduling information may be notified by DCI. For example, a DCI that schedules DL data reception may be called a DL assignment, and a DCI that schedules UL data transmission may be called an UL grant.

PCFICH transmits the number of OFDM symbols used for PDCCH. The PHICH transmits HARQ (Hybrid Automatic Repeat Repeat request) acknowledgment information (for example, retransmission control information, HARQ-ACK, ACK / NACK, etc.) for the PUSCH. The EPDCCH is frequency-division multiplexed with a PDSCH (Downlink Shared Data Channel) and used for transmission of DCI and the like like the PDCCH.

In the wireless communication system 1, as an uplink channel, an uplink shared channel (PUSCH: Physical Uplink Shared Channel), an uplink control channel (PUCCH: Physical Uplink Control Channel), a random access channel (PRACH: Physical Random Access Channel) or the like is used. By PUSCH, user data, higher layer control information, etc. are transmitted. In addition, downlink radio quality information (CQI: Channel Quality Indicator), acknowledgment information, scheduling request (SR: Scheduling Request), and the like are transmitted by PUCCH. The PRACH transmits a random access preamble for establishing a connection with a cell.

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, a position determination reference signal (PRS: Positioning Reference Signal), and the like are transmitted. In the wireless communication system 1, a reference signal for measurement (SRS: Sounding Reference Signal), a reference signal for demodulation (DMRS), and the like are transmitted as uplink reference signals. The DMRS may be called a user terminal specific reference signal (UE-specific Reference Signal). Further, the transmitted reference signal is not limited to these.

<Base station>
FIG. 7 is a diagram showing an example of the overall configuration of the base station according to the present embodiment. The base station 10 includes a plurality of transmitting / receiving antennas 101, an amplifier unit 102, a transmitting / receiving unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. Note that the transmitting / receiving antenna 101, the amplifier unit 102, and the transmitting / receiving unit 103 may be configured to include at least one each.

ユーザ User data transmitted from the 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, regarding user data, processing of a PDCP (Packet Data Convergence Protocol) layer, division / combination of user data, transmission processing of an RLC layer such as RLC (Radio Link Control) retransmission control, and MAC (Medium Access) Control) Transmission / reception control (for example, HARQ transmission processing), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, precoding processing, etc., and transmission / reception processing are performed. 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.

(4) The transmission / reception unit 103 converts the baseband signal precoded and output from the baseband signal processing unit 104 for each antenna into a radio frequency band, and transmits the radio frequency band. The radio frequency signal frequency-converted by the transmitting / receiving section 103 is amplified by the amplifier section 102 and transmitted from the transmitting / receiving 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. Note that the transmission / reception unit 103 may be configured as an integrated transmission / reception unit, or may be configured from a transmission unit and a reception unit.

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

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

(4) The transmission path interface 106 transmits and receives signals to and from the higher-level station device 30 via a predetermined interface. The transmission line interface 106 transmits and receives signals (backhaul signaling) to and from another base station 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface). Is also good.

Transceiver 103 transmits a DL signal (for example, at least one of PDCCH (DCI), PDSCH (DL data, upper layer control information), and DL reference signal). In addition, the transmitting / receiving section 103 receives a UL signal (for example, at least one of PUCCH (UCI), PUSCH (UL data, upper layer control information, UCI), and UL reference signal).

The transmission / reception unit 103 transmits downlink control information including a predetermined field indicating a frequency domain resource allocated to the downlink shared channel (for example, PDSCH) or the uplink shared channel (for example, PUSCH). Further, transmitting / receiving section 103 may transmit MIB via PBCH. Further, the transmitting / receiving section 103 may transmit at least one of the SIB1 and the RRC message.

FIG. 8 is a diagram showing an example of a functional configuration of the base station according to the present embodiment. In this example, functional blocks of characteristic portions in the present embodiment are mainly shown, and it may be assumed that base station 10 also has other functional blocks necessary for 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. Note that these configurations need only be included in base station 10, and some or all of the configurations need not be included in baseband signal processing section 104.

The control unit (scheduler) 301 controls the entire base station 10. The control unit 301 can be configured from 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 assignment in the mapping unit 303, and the like. Further, the control unit 301 controls a signal reception process in the reception signal processing unit 304, a signal measurement in the measurement unit 305, and the like.

The control unit 301 controls scheduling (for example, resource allocation) of system information (for example, SIB1), a downlink shared channel (for example, PDSCH), a downlink control channel (for example, PDCCH), and an uplink shared channel (for example, PUSCH). I do.

The control unit 301 controls scheduling of a synchronization signal (for example, PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)) and a downlink reference signal (for example, CRS, CSI-RS, and DMRS).

The control unit 301 includes an uplink data signal (for example, a signal transmitted on the PUSCH), an uplink control signal (for example, a signal transmitted on the PUCCH and / or PUSCH, acknowledgment information, etc.), a random access preamble (for example, a PRACH). (Transmission signal), scheduling of uplink reference signals and the like.

{Also, the control unit 301 may determine the bandwidth of the initial access band (initial BWP) based on whether the state of the user terminal is in the connected state. Further, control section 301 may determine the bandwidth of the initial access band based on whether or not information on the initial access band in the carrier is provided by an upper layer.

The control unit 301 determines whether the control resource set determined based on the index provided by the broadcast channel overlaps with the band determined based on the information on the initial access band provided by the higher layer, The bandwidth of the initial access band may be determined.

Specifically, when the control resource set does not overlap with the band determined based on the information on the initial access band, the control unit 301 performs the initial access for the initial access based on the information on the initial access band. The bandwidth of the band may be determined.

On the other hand, when the control resource set overlaps with the band determined based on the information on the initial access band, the control unit 301 determines a bandwidth of the initial access band based on an index given by a broadcast channel. May be determined.

The control unit 301 may control the transmission of the downlink shared channel or the reception of the uplink shared channel in the initial access band.

Specifically, the control unit 301 determines a bit of a predetermined field (for example, a frequency domain resource allocation field) in downlink control information for scheduling the downlink shared channel or the uplink shared channel based on the determined bandwidth. The number may be determined (first mode).

The control unit 301 may control bit selection in rate matching of the downlink shared channel or the uplink shared channel based on the determined bandwidth (second mode).

(4) The control unit 301 may control at least one of generation and transmission of the downlink control information. Specifically, the control unit 301 performs a cyclic redundancy check (P-RNTI (paging-Radio Network Network Temporary Identifier)) or SI-RNTI (System Information Information-Radio Network Network Temporary Identifier) on the downlink control information. A CRC (Cyclic {Redundancy} Check) bit may be added.

Transmission signal generation section 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from control section 301, and outputs the generated signal to mapping section 303. The transmission signal generation unit 302 can be configured from 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 downlink control information (at least one of a DL assignment and a UL grant) based on, for example, an instruction from the control unit 301. In addition, the downlink data signal is subjected to an encoding process and a modulation process according to an encoding rate, a modulation scheme, and the like determined based on channel state information (CSI: Channel \ State \ Information) from each user terminal 20 or the like.

Mapping section 303 maps the downlink signal generated by transmission signal generation section 302 to a predetermined radio resource based on an instruction from control section 301, and outputs the result to transmission / reception section 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.

(4) The reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, and decoding) 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 from 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.

(4) The reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301. For example, when a PUCCH including HARQ-ACK is received, HARQ-ACK is output to control section 301. Further, the reception signal processing unit 304 outputs the reception signal and / or the signal after the 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, or the like based on the received signal. Measuring section 305 receives power (for example, RSRP (Reference Signal Received Power)), reception 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)), channel information (for example, CSI), and the like may be measured. The measurement result may be output to the control unit 301.

<User terminal>
FIG. 9 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 transmitting / receiving antennas 201, an amplifier unit 202, a transmitting / receiving unit 203, a baseband signal processing unit 204, and an application unit 205. Note that the transmitting / receiving antenna 201, the amplifier unit 202, and the transmitting / receiving unit 203 may be configured to include at least one each.

(4) The radio frequency signal received by the transmitting / receiving 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 transmitting / receiving section 203 converts the frequency of the received signal into a baseband signal and outputs the baseband signal to the baseband signal processing section 204. The transmission / reception unit 203 can be configured from 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. Note that 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.

The baseband signal processing unit 204 performs FFT processing, error correction decoding, reception processing for retransmission control, 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, of the downlink data, broadcast information 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 processor 204 performs retransmission control transmission processing (eg, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like, and performs transmission / reception processing. Transferred to 203.

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

(4) The transmission / reception unit 203 receives a DL signal (for example, at least one of a PDCCH (DCI), a PDSCH (DL data, higher layer control information), and a DL reference signal). In addition, the transmission / reception unit 203 transmits a UL signal (for example, at least one of a PUCCH (UCI), a PUSCH (UL data, upper layer control information, UCI), and a UL reference signal).

The transmission / reception unit 203 receives downlink control information including a predetermined field indicating a frequency domain resource allocated to the downlink shared channel (for example, PDSCH) or the uplink shared channel (for example, PUSCH). Further, transmitting / receiving section 103 may transmit MIB via PBCH. Further, the transmitting / receiving section 203 may receive at least one of the SIB1 and the RRC message.

FIG. 10 is a diagram showing an example of a functional configuration of the user terminal according to the present embodiment. Note that, in this example, functional blocks of characteristic portions in the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication.

The baseband signal processing unit 204 of 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 need only be included in the user terminal 20, and some or all of the configurations need 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 from 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 assignment in the mapping unit 403, and the like. Further, the control unit 401 controls a signal reception process in the reception signal processing unit 404, a 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 base station 10 from the reception signal processing unit 404. The control unit 401 controls generation of an uplink control signal and / or an uplink data signal based on a result of determining whether or not retransmission control is required for a downlink control signal and / or a downlink data signal.

(4) The control unit 401 monitors the CORRESET (or the search space) (blind decoding) and detects downlink control information (DCI). Specifically, control section 401 may control detection of DCI including a predetermined field (for example, a frequency domain allocation field) indicating a frequency domain resource allocated to the downlink shared channel or the uplink shared channel.

The control unit 401 may determine the bandwidth of the initial access band (initial BWP) based on whether or not the state of the user terminal is in the connected state. Further, control section 401 may determine the bandwidth of the initial access band based on whether or not information on the initial access band in the carrier is provided by an upper layer.

The control unit 401 determines whether the control resource set determined based on the index provided by the broadcast channel overlaps with the band determined based on the information on the initial access band provided by the upper layer, The bandwidth of the initial access band may be determined.

Specifically, when the control resource set does not overlap with the band determined based on the information on the initial access band, the control unit 401 performs the initial access for the initial access based on the information on the initial access band. The bandwidth of the band may be determined.

On the other hand, when the control resource set overlaps with the band determined based on the information on the initial access band, the control unit 401 determines a bandwidth of the initial access band based on an index given by a broadcast channel. May be determined.

The control unit 401 may control reception of the downlink shared channel or transmission of the uplink shared channel in the initial access band.

Specifically, based on the determined bandwidth, the control unit 401 determines a bit of a predetermined field (for example, a frequency domain resource allocation field) in downlink control information for scheduling the downlink shared channel or the uplink shared channel. The number may be determined (first mode).

The control unit 401 may control bit selection in rate matching of the downlink shared channel or the uplink shared channel based on the determined bandwidth (second mode).

In addition, the downlink control information is added with a cyclic redundancy check (CRC: Cyclic Redundancy Check) bit scrambled by P-RNTI (paging-Radio Network Temporary Identifier) or SI-RNTI (System Information-Radio Network Network Temporary Identifier). May be.

When the control unit 401 acquires various information notified from the base station 10 from the reception signal processing unit 404, the control unit 401 may update parameters used for control based on the information.

Transmission signal generation section 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on an instruction from control section 401 and outputs the generated signal to mapping section 403. The transmission signal generation unit 402 can be configured from 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.

(4) The transmission signal generation unit 402 generates an uplink control signal related to acknowledgment information, channel state information (CSI), and the like based on an instruction from the control unit 401, for example. Further, transmission signal generating section 402 generates an uplink data signal based on an instruction from control section 401. For example, the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal when the downlink control signal notified from the base station 10 includes a UL grant.

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

(4) The reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, and decoding) on the reception signal input from the transmission / reception unit 203. Here, the received signal is, for example, a downlink signal (a downlink control signal, a downlink data signal, a downlink reference signal, etc.) transmitted from the base station 10. The reception signal processing unit 404 can be configured from 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. In addition, the reception signal processing unit 404 can configure a reception unit according to the present disclosure.

(4) 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. Further, the reception signal processing unit 404 outputs the reception signal and / or the signal after the reception processing to the measurement unit 405.

The measuring unit 405 measures 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), and channel information (for example, CSI). The measurement result may be output to the control unit 401.

<Hardware configuration>
Note that the block diagram used in the description of the above-described embodiment shows blocks in functional units. These functional blocks (components) are realized by an arbitrary combination of hardware and / or software. In addition, a method of implementing 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 from each other. Alternatively, they may be connected indirectly (for example, using wired and / or wireless communication) and implemented using these multiple devices.

For example, the base station, the user terminal, and the like according to the present embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method according to the present disclosure. FIG. 11 is a diagram illustrating an example of a hardware configuration of the base station and the user terminal according to the present embodiment. The above-described 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. .

In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices illustrated in the drawing, or may be configured to exclude some of the devices.

For example, although only one processor 1001 is illustrated, there may be multiple processors. Further, the processing may be executed by one processor, or the processing may be executed by one or more processors simultaneously, sequentially, or by using another method. Note that the processor 1001 may be implemented by one or more chips.

The functions of the base station 10 and the user terminal 20 are performed, for example, by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002 so that the processor 1001 performs an arithmetic operation and communicates via the communication device 1004. , And controlling the 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: 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.

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 processes according to these. As the program, a program that causes a computer to execute at least a part of the operation described in the above embodiment is used. For example, the control unit 401 of the user terminal 20 may be implemented by a control program stored in the memory 1002 and operated by the processor 1001, and other functional blocks may be implemented similarly.

The memory 1002 is a computer-readable recording medium, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically EPROM), RAM (Random Access Memory), and other appropriate storage media. It may be constituted 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, etc.), a digital versatile disc, At least one of a Blu-ray (registered trademark) disk, a removable disk, a hard disk drive, a smart card, a flash memory device (eg, a card, a stick, a key drive), a magnetic stripe, a database, a server, and other suitable storage media. May be configured. The storage 1003 may be called an auxiliary storage device.

The communication device 1004 is hardware (transmitting / receiving device) for performing communication between computers via a wired and / or wireless network, and is also referred to as, 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 in order 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 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 external input. The output device 1006 is an output device that performs output to the outside (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, and the like). Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

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.

In addition, the base station 10 and the user terminal 20 include hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). It may be configured to include hardware, and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

(Modification)
Note that 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, channels and / or symbols may be signals. 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, a pilot signal, or the like according to an applied standard. A component carrier (CC: Component Carrier) may be called a cell, a frequency carrier, a carrier frequency, or the like.

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

{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 numerology. Further, the slot may include a plurality of mini slots. Each minislot may be constituted by one or more symbols in the time domain. Also, the mini-slot may be called a sub-slot.

Radio frames, subframes, slots, minislots, and symbols all represent time units when transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may have different names corresponding to each. For example, one subframe may be called a transmission time interval (TTI: Transmission @ Time @ Interval), a plurality of consecutive subframes may be called a TTI, and one slot or one minislot is called a TTI. You may. That is, the subframe and / or TTI may be a subframe (1 ms) in the existing LTE, may be a period shorter than 1 ms (for example, 1 to 13 symbols), or may be a period longer than 1 ms. There may be. Note that the unit representing the TTI may be called a slot, a minislot, or the like instead of a subframe.

Here, the TTI refers to, for example, a minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling for allocating radio resources (frequency bandwidth, transmission power, and the like that can be used in each user terminal) to each user terminal in TTI units. Note that 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 codeword, or may be a processing unit such as scheduling and link adaptation. Note that when a TTI is given, a time interval (for example, the number of symbols) to which a transport block, a code block, and / or a codeword are actually mapped may be shorter than the TTI.

If one slot or one minislot is called a TTI, one or more TTIs (ie, one or more slots or one or more minislots) may be the minimum time unit for scheduling. Further, the number of slots (mini-slot number) 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, a long subframe, or the like. A TTI shorter than the 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 (for example, a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (for example, a shortened TTI, etc.) may be replaced with a TTI shorter than the long TTI and 1 ms The TTI having the above-described TTI length may be replaced with the TTI.

A resource block (RB: Resource Block) 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 a time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI and one subframe may each be configured by one or a plurality of resource blocks. Note that one or more RBs include a physical resource block (PRB: Physical @ RB), a subcarrier group (SCG: Sub-Carrier @ Group), a resource element group (REG: Resource @ Element @ Group), a PRB pair, an RB pair, and the like. May be called.

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

The structures of the above-described radio frame, subframe, slot, minislot, symbol, and the like 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 and RBs included in a slot or minislot, included in an RB The configuration of the number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP: Cyclic @ Prefix) length, and the like can be variously changed.

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

名称 Names used for parameters and the like in this specification are not restrictive 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 that various channels assigned to these various channels and information elements can be identified. The nomenclature is not a limiting name in any respect.

The information, signals, etc. described herein may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., that can be referred to throughout the above description are not limited to voltages, currents, electromagnetic waves, magnetic or magnetic particles, optical or photons, or any of these. May be represented by a combination of

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

(4) Information and signals input and output may be stored in a specific place (for example, a memory) or may be managed using a management table. Information and signals that are input and output can be overwritten, updated, or added. The output information, signal, and the like may be deleted. The input information, signal, and the like may be transmitted to another device.

Notification of information is not limited to the aspect / embodiment described in this specification, and may be performed using another method. For example, the information is notified by physical layer signaling (for example, downlink control information (DCI: Downlink Control Information), uplink control information (UCI: Uplink Control Information)), higher layer signaling (for example, RRC (Radio Resource Control) signaling, It may be implemented by broadcast information (master information block (MIB: Master Information Block), system information block (SIB: System Information Block), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.

Note that 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. 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. Also, the MAC signaling may be notified using, for example, a MAC control element (MAC @ CE (Control @ Element)).

Further, the notification of the predetermined information (for example, the notification of “X”) is not limited to an explicit notification, and is implicit (for example, by not performing the notification of the predetermined information or by another information). May be performed).

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

Software, regardless of whether it is called software, firmware, middleware, microcode, a hardware description language, or any other name, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules , Applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

ソフトウェア Also, software, instructions, information, and the like may be transmitted and received via a transmission medium. For example, if the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.), the website, server, etc. , Or when transmitted from another remote source, these wired and / or wireless technologies are included within the definition of the transmission medium.

用語 As used herein, the terms “system” and “network” are used interchangeably.

In this specification, “base station (BS: Base @ Station)”, “wireless 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 a fixed station (fixed @ station), NodeB, eNodeB (eNB), access point (access @ point), transmission point, reception point, femtocell, small cell, and the like.

A base station can accommodate one or more (eg, 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 indoor base station (RRH: Communication services can also be provided by Remote Radio Head)). 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 can be 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 terminal, by one of ordinary skill 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.

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

Similarly, the user terminal in this specification may be replaced by the base station. In this case, a configuration in which the base station 10 has the function of the user terminal 20 described above may be adopted.

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

各 Each aspect / embodiment described in the present specification may be used alone, may be used in combination, or may be used by switching with execution. In addition, the processing procedure, sequence, flowchart, and the like of each aspect / embodiment described in this specification may be interchanged as long as there is no inconsistency. For example, the methods described herein present elements of various steps in a sample order, and are not limited to the specific order presented.

Each aspect / embodiment described in this specification is based on 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 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 (registered trademark) ), A system utilizing other appropriate wireless communication methods, and / or a next-generation system extended based on these.

記載 The term "based on" as used herein does not mean "based solely on" unless stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

いかなる Any reference to elements using designations such as "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 to distinguish between two or more elements. Thus, reference to a first and second element does not mean that only two elements can be employed or that the first element must precede the second element in any way.

用語 As used herein, the term “determining” may encompass a wide variety of actions. For example, “determining” means calculating, computing, processing, deriving, investigating, looking up (eg, a table, database, or other data). It may be regarded as "determining" such as searching in a structure), ascertaining, and the like. Also, “determining” includes receiving (eg, receiving information), transmitting (eg, transmitting information), input (input), output (output), and access ( accessing) (e.g., accessing data in a memory) or the like. Also, “judgment (decision)” is regarded as “judgment (decision)” of resolving, selecting, selecting, establishing, comparing, etc. Is also good. That is, “judgment (decision)” may be regarded as “judgment (decision)” of any operation.

As used herein, the terms “connected,” “coupled,” or any variation thereof, mean any direct or indirect connection or indirect connection between two or more elements. Coupling is meant and may include the presence of one or more intermediate elements between two elements "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 electrical wires, cables and / or printed electrical connections, and as some non-limiting and non-exhaustive examples, the radio frequency domain , Can be considered "connected" or "coupled" to each other, such as by using electromagnetic energy having wavelengths in the microwave and / or light (both visible and invisible) regions.

において In this specification, the term “A and B are different” may mean that “A and B are different from each other”. Terms such as "away" and "coupled" may be interpreted similarly.

Where the terms “including”, “comprising”, and variations thereof, are used in the present description or claims, these terms are inclusive as well as the term “comprising” It is intended to be relevant. Further, the term "or" as used in the present specification or claims is not intended to be the exclusive OR.

Although the invention according to the present disclosure has been described in detail above, it is obvious to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in this specification. The invention according to the present disclosure can be embodied as modifications and changes without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description in the present specification is for the purpose of illustrative explanation and does not bring any restrictive meaning to the invention according to the present disclosure.

Claims

A receiving unit that receives downlink control information including a predetermined field indicating a frequency domain resource allocated to the downlink shared channel or the uplink shared channel,
The initial access bandwidth based on whether the control resource set determined based on the index provided by the broadcast channel overlaps with the bandwidth determined based on the information on the initial access bandwidth provided by the upper layer. A control unit for determining the bandwidth of
A user terminal comprising:
When the control resource set does not overlap with the band determined based on the information on the initial access band, the control unit determines the bandwidth based on the information on the initial access band. The user terminal according to claim 1, wherein
The controller according to claim 1, wherein the control resource set determines the bandwidth based on the index when the control resource set overlaps with the bandwidth determined based on information on the initial access bandwidth. User terminal as described.
4. The user terminal according to claim 1, wherein the control unit determines the number of bits of the predetermined field based on the determined bandwidth. 5.
The said control part controls the bit selection in the rate matching of the said downlink shared channel or the said uplink shared channel based on the said determined bandwidth, The Claims 1 to 4 characterized by the above-mentioned. User terminal.
The downlink control information is added with a cyclic redundancy check (CRC: Cyclic Redundancy Check) bit scrambled by P-RNTI (Paging-Radio Network Temporary Identifier) or SI-RNTI (System Information-Radio Network Temporary Identifier). The user terminal according to any one of claims 1 to 5, characterized in that: