WO2019234928A1

WO2019234928A1 - User terminal

Info

Publication number: WO2019234928A1
Application number: PCT/JP2018/022088
Authority: WO
Inventors: 翔平吉岡; 祐輝松村; 聡永田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2018-06-08
Filing date: 2018-06-08
Publication date: 2019-12-12

Abstract

A user terminal according to one embodiment of the present disclosure is characterized by having: a receiving unit for receiving information about the setting of a plurality of semi-persistent channel state information (SP-CSI) reports; and a control unit for dropping at least one of the plurality of SP-CSI reports on the basis of prescribed conditions when there are multiple SP-CSI reports in the same slot. This embodiment makes it possible to appropriately perform SP-CSI reporting even when multiple SP-CSI trigger states are simultaneously active.

Description

User terminal

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

In the UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) has been specified for the purpose of further high data rate, low delay, etc. (Non-patent Document 1). In addition, LTE-A (LTE Advanced, LTE Rel. 10, 11, 12, 13) was specified for the purpose of further increasing the capacity and sophistication of LTE (LTE Rel. 8, 9).

LTE successor systems (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 Also referred to as Rel.

In an existing LTE system (for example, LTE Rel. 8-13), a user terminal (UE: User Equipment) periodically and / or aperiodically performs channel state information (CSI: Channel State Information) with respect to a base station. ). The UE transmits CSI using an uplink control channel (PUCCH: Physical Uplink Control Channel) and / or an uplink shared channel (PUSCH: Physical Uplink Shared Channel).

In future wireless communication systems (for example, NR), CSI reports using a different configuration from existing LTE systems (for example, LTE Rel. 13 or earlier) are being studied.

For example, an SP-CSI (Semi-Persistent CSI) report in which the UE reports CSI using a resource designated as semi-persistent (semi-persistent, semi-persistent) is being studied. .

Also, it is considered to control the activation and deactivation of PUSCH-based SP-CSI reports using downlink control information (DCI). In a PUSCH based SP-CSI report, if multiple SP-CSI trigger states are active, more than one PUSCH based SP-CSI report may occur in the same slot.

However, in NR, it is considered that the UE does not expect to send more than one PUSCH-based SP-CSI report per slot per component carrier (CC) or across all CCs. ing. For this reason, if more than one PUSCH-based SP-CSI report is generated in the same slot, it is not possible to report an appropriate CSI at an appropriate timing unless it is clarified which SP-CSI report is transmitted. There is a problem in that throughput decreases.

Therefore, an object of the present disclosure is to provide a user terminal that can appropriately perform SP-CSI reporting even when a plurality of SP-CSI trigger states are active at the same time.

A user terminal according to an aspect of the present disclosure includes a reception unit that receives information on settings of a plurality of semi-persistent channel state information reports (SP-CSI (Semi-Persistent Channel State Information) reports), and a plurality of terminals in the same slot And a control unit that drops at least one of the plurality of SP-CSI reports based on a predetermined condition.

According to one aspect of the present disclosure, it is possible to appropriately perform SP-CSI reporting even when a plurality of SP-CSI trigger states are active at the same time.

FIG. 1 is a diagram illustrating an example in which more than one PUSCH-based SP-CSI report occurs in the same slot. FIG. 2 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 3 is a diagram illustrating an example of the overall configuration of a radio base station according to an embodiment. FIG. 4 is a diagram illustrating an example of a functional configuration of a radio base station according to an embodiment. FIG. 5 is a diagram illustrating an example of an overall configuration of a user terminal according to an embodiment. FIG. 6 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment. FIG. 7 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment.

In NR, the UE measures the channel state using a predetermined reference signal (or a resource for the reference signal). The reference signal for channel state measurement may be called CSI-RS (Channel State Information-Reference Signal). Note that the UE measures the channel state using signals other than CSI-RS (for example, synchronization signal / broadcast channel (SS / PBCH: Synchronization Signal / Physical Broadcast Channel) block, synchronization signal, demodulation reference signal, etc.). May be.

The CSI-RS resource may include at least one of non-zero power (NZP: Non Zero Power) CSI-RS and CSI-IM (Interference Management). Further, the SS / PBCH block is a block including a primary synchronization signal (PSS: Primary Synchronization Signal), a secondary synchronization signal (SSS: Secondary Synchronization Signal), and a PBCH, and may be referred to as an SS block or the like.

The UE sends channel state information (CSI) to a base station (for example, BS (Base Station), transmission / reception point (TRP), eNB (eNodeB) at a predetermined timing based on a measurement result such as a reference signal. ), And may be called gNB (NR NodeB).

CSI includes channel quality identifier (CQI: Channel Quality Indicator), precoding matrix identifier (PMI), rank identifier (RI: Rank Indicator), layer identifier (LI: layer indication), CSI-RS resource. It may include at least one of an identifier (CRI: CSI-RS resource indicator), L1-RSRP (reference signal received power (RSRP) in the physical layer (layer 1)), and the like.

CSI may have multiple parts. The first part of CSI (CSI part 1) may include information (for example, RI) having a relatively small number of bits. The second part of CSI (CSI part 2) may include information having a relatively large number of bits (for example, CQI) such as information determined based on CSI part 1.

CSI feedback methods include (1) periodic CSI (P-CSI: Periodic CSI) report, (2) aperiodic CSI (A-CSI) report, and (3) semi-permanent (semi-permanent). Persistent, semi-persistent (CSI) reports (SP-CSI: Semi-Persistent CSI) reports are being studied.

Once the UE has specified the SP-CSI reporting resource (which may be referred to as SP-CSI resource), unless the SP-CSI resource release (release or deactivation) is specified separately, the UE Resources based on can be used periodically.

The SP-CSI resource may be a resource set by higher layer signaling, or may be a resource specified by an SP-CSI report activation signal (may be referred to as a “trigger signal”). Good.

Here, the upper layer signaling may be, for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information, or a combination thereof.

For MAC signaling, for example, a MAC control element (MAC CE (Control Element)), a MAC PDU (Protocol Data Unit), or the like may be used. The broadcast information may be, for example, a master information block (MIB: Master Information Block), a system information block (SIB: System Information Block), and minimum system information (RMSI: Remaining Minimum System Information).

SP-CSI resource information (which may be referred to as SP-CSI configuration, SP-CSI report configuration (CSI-ReportConfig), etc.) includes upper layer signaling, physical layer signaling (eg, downlink control information (DCI: Downlink Control)). Information))) or a combination thereof may be notified to the UE.

The SP-CSI setting includes, for example, a report period (which may be called RRC parameter “reportSlotConfig”, L1 parameter “ReportPeriodicity”, “ReportPeriodicity-spCSI”, etc.) and an offset (RRC parameter “reportSlotOffsetList”, L1 parameter “ReportSlotOffset”). Etc.), which may be expressed in predetermined time units (slot units, subframe units, symbol units, etc.).

The SP-CSI setting may include a setting ID (RRC parameter “CSI-ReportConfigId”, L1 parameter “reportConfigID”), the type of CSI reporting method (whether it is SP-CSI or the like), and the reporting cycle based on the setting ID. Parameters such as may be specified. The SP-CSI resource information may include information (CSI-ResourceConfigId) indicating which reference signal (or resource for which reference signal) is used to report the measured SP-CSI. The SP-CSI resource information may be referred to as SP-CSI resource setting, SP-CSI report setting, and the like.

When the UE receives a predetermined activation signal, the UE performs CSI measurement using, for example, a predetermined reference signal (for example, may be referred to as SP-CSI-RS) and SP-CSI using SP-CSI resources. Reporting (SP-CSI reporting based on SP-CSI settings) may be performed periodically. The UE stops SP-CSI measurement and / or reporting when it receives a predetermined deactivation signal or when a predetermined timer expires.

The SP-CSI report uses a primary cell (PCell: Primary Cell), a primary secondary cell (PSCell: Primary Secondary Cell), a PUCCH secondary cell (PUCCH SCell), other cells (for example, a secondary cell (Secondary Cell)), etc. May be transmitted.

The activation / deactivation signal of the SP-CSI report may be notified using, for example, MAC signaling (for example, MAC CE) or may be notified using physical layer signaling (for example, DCI). .

Note that the SP-CSI report may be transmitted using one or both of PUCCH and PUSCH. Which is used for transmission may be set from the gNB to the UE by RRC signaling, may be specified by MAC CE or the like, or may be notified by DCI.

The channel for performing the SP-CSI report may be determined based on the activation signal of the SP-CSI report. For example, an SP-CSI report using PUCCH (which may be referred to as “PUCCH-based SP-CSI report”) may be activated by MAC CE, or an SP-CSI report using PUSCH (“PUSCH-based SP- CSI report ") may be activated (triggered) by DCI.

The PUCCH-based SP-CSI report activation MAC CE is also simply referred to as “activation MAC CE” hereinafter. The deactivation MAC CE of the PUCCH-based SP-CSI report is also simply referred to as “deactivation MAC CE” hereinafter.

The DCI for activation of PUSCH-based SP-CSI report is also simply referred to as “DCI for activation” below. The DCI for deactivation of the PUSCH-based SP-CSI report is hereinafter also simply referred to as “DCI for deactivation”.

The DCI for activation / deactivation is masked by the cyclic redundancy check (CRC: Cyclic Redundancy Check) bit by the Radio Network Temporary Identifier (RNTI) (SP-CSI-RNTI) for SP-CSI reporting ( It may be a scrambled DCI.

When a specific field of a certain DCI (eg, DCI format 0_1) has a predetermined value, the UE is a DCI for PUSCH-based SP-CSI report, and the activation of the SP-CSI report Or it may be assumed to indicate deactivation. Note that “DCI format” and “DCI” may be interchanged.

The UE may assume that DCI format 0_1 that satisfies all of the following is DCI for activation:
All HARQ (Hybrid Automatic Repeat reQuest) process number (HPN) fields are set to '0'.
The redundancy version (RV) field is set to '00'.

The UE may assume that DCI format 0_1 that satisfies the following is a DCI for deactivation:
• All HPN fields are set to '0'.
-Modulation and Coding Scheme (MCS) fields are all set to '1'.
The resource block assignment (resource assignment (RA)) field is set to “0” when (1) the upper layer sets only RA type 0. (2) The upper layer is the RA type. When only 1 is set, all are set to '1'. (3) The upper layer sets the dynamic switch of

RA type

0 and 1, and the most significant bit (MSB: Most Significant Bit) is '0'. Are all set to '0', otherwise all are set to '1'.
-The RV field is set to '00'.

The DCI for activation may include a frequency domain resource assignment (Freq-RA) field. The Freq-RA field may indicate a PUSCH frequency resource (for example, a resource block (PRB)) used for SP-CSI reporting.

At least one of the activation MAC CE and the activation DCI may activate one or more trigger states. Here, the trigger state may mean a CSI setting to be activated, and may include a setting ID (CSI-ReportConfigId).

For example, the UE may control the SP-CSI activation based on the correspondence between the value of the CSI request field included in the activation DCI and the trigger state. The correspondence relationship may be determined according to the specification, or may be set by higher layer signaling (for example, RRC signaling).

Each code point (value indicated by a bit) of the CSI request field may be associated with one or a plurality of CSI settings (may be read by including CSI reporting (including CSI reporting)). Note that the code point may not include a code point indicating “no CSI request”.

The size (number of bits) of the CSI request field may be the same as the size of the CSI request field (which may be called “ReportTriggerSize” or the like) set by higher layer signaling (for example, RRC signaling). The size of the CSI request field to be set may correspond to the size of the CSI request field for DCI format 0_1. “ReportTriggerSize” may be an arbitrary number of bits (1, 2, 3, 4,...), For example.

The CSI request field for activation DCI and the CSI request field for A-CSI trigger may be the same size. The number of SP-CSI trigger states and the number of A-CSI trigger states may be the same or different.

Incidentally, in the PUSCH-based SP-CSI report, it may be allowed that a plurality of SP-CSI trigger states are active at the same time. That is, when multiple SP-CSI trigger states are active, more than one PUSCH-based SP-CSI report may occur in the same slot depending on the setting of the period, offset, etc. of each SP-CSI report. .

Also, more than one PUSCH-based SP-CSI report may occur in the same slot when both PUSCH-based SP-CSI report and PUCCH-based SP-CSI report are activated.

FIG. 1 is a diagram illustrating an example in which more than one PUSCH-based SP-CSI report occurs in the same slot. In this example, D indicates a downlink slot, U indicates an uplink slot, and S indicates a slot capable of uplink transmission at least partially. The slot configuration is not limited to this.

The UE has activated two SP-CSI reports. One is PUSCH-based SP-CSI report # 1 transmitted from slot # 2 with a period of 9 slots. The other is PUSCH-based SP-CSI report # 2 (or PUCCH-based SP-CSI report) transmitted from slot # 3 with a period of 4 slots.

The UE only needs to transmit one SP-CSI report in slots # 2, # 3, etc., which have only one SP-CSI report (no SP-CSI report collision). On the other hand, the UE has multiple SP-CSI reports in slot # 11 (there is an SP-CSI report collision). Note that the collision of a plurality of CSI reports may mean that time occupancy of physical channels scheduled to transmit these CSI reports overlaps in the same carrier.

However, in NR, it is considered that the UE does not expect to send more than one PUSCH-based SP-CSI report per slot per component carrier (CC) or across all CCs. ing. It may also be assumed that the UE does not expect to send more than one SP-CSI report per slot regardless of PUCCH and PUSCH bases per CC or across all CCs.

Therefore, the UE cannot determine which SP-CSI report should be transmitted in slot # 11 of FIG. If more than one PUSCH-based SP-CSI report is generated in the same slot, if it is not clarified which SP-CSI report is transmitted, an appropriate CSI cannot be reported at an appropriate timing, resulting in a decrease in communication throughput. May occur.

Therefore, the present inventors have conceived a method for appropriately performing SP-CSI reporting even when a plurality of SP-CSI trigger states are simultaneously active.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The wireless communication method according to each embodiment may be applied independently or in combination.

(Wireless communication method)
In one embodiment, if the UE has multiple SP-CSI reports in the same slot, the UE drops at least one of the multiple SP-CSI reports based on a predetermined condition. In other words, at least one of the plurality of SP-CSI reports is not transmitted by the UE based on a predetermined condition. The UE may determine an SP-CSI report to be transmitted among the plurality of SP-CSI reports based on the predetermined condition.

Here, the predetermined condition may include any of the following (1) to (4) or a combination thereof:
(1) Conditions regarding the payload size of SP-CSI for the plurality of SP-CSI reports,
(2) SP-CSI priority conditions for the plurality of SP-CSI reports,
(3) Conditions relating to the temporal position of the SP-CSI report resource in the slot for the plurality of SP-CSI reports,
(4) Conditions related to the SP-CSI reporting period for the plurality of SP-CSI reports.

Regarding (1) above, for example, the UE may transmit an SP-CSI report having the largest or smallest payload size among a plurality of SP-CSI reports in the same slot, and drop the others.

This “payload size” may be read as “corresponding to SP-CSI reporting resource capable of transmitting payload size”, “corresponding to SP-CSI reporting resource corresponding to the number of resource elements”, or the like. Good.

When the above-mentioned predetermined condition means that the SP-CSI report having the largest payload size is transmitted, it is possible to secure a transmission opportunity for information having a relatively large number of bits such as CQI (for example, CSI part 2). When the predetermined condition means that a CSI report having the smallest payload size is transmitted, it is possible to increase transmission opportunities for information such as RI having a relatively small number of bits (for example, CSI part 1).

For (2) above, the CSI report may be associated with a priority value. For example, the priority value may be defined using the function Pri _iCSI (y, k, c, s).

Here, y may be a value based on the type of CSI report (A-CSI report, SP-CSI report, or P-CSI report) and the channel (PUSCH or PUCCH) that transmits the CSI report. For example, y = 0 for PUSCH-based A-CSI report, y = 1 for PUSCH-based SP-CSI report, y = 2 for PUCCH-based SP-CSI report, and PUCCH-based P-CSI report y = 3 may be sufficient.

K may be a value based on whether or not the CSI report includes L1-RSRP (for example, k = 0 when the CSI report includes L1-RSRP). c may be a serving cell index. s may be a setting ID (reportConfigID).

For example, Pri _iCSI (y, k, c, s) = 2 · N _cells · M _s · y + N _cells · M _s · k + M _s · c + s Here, N _cells may be the value of the maximum number of serving _cells to be set (upper layer parameter maxNrofServingCells), and M _s may be the value of the maximum number of CSI report settings to be set (upper layer parameter maxNrofCSI-ReportConfigurations).

If the value of the _Pri ICSI the first CSI reporting (y, k, c, s ) is less than the value of _{Pri iCSI (y, k, c} , s) of the second CSI report, first CSI report No. It may mean that the priority is higher than the CSI report 2.

Note that the priority value in (2) above may be obtained based on another definition.

If the above predetermined condition means that an SP-CSI report having a higher priority (eg, Pri _iCSI (y, k, c, s) is smaller) is transmitted, preferably a CSI report having a higher priority is transmitted. Can be sent. When the predetermined condition means that an SP-CSI report having a lower priority is transmitted, it is possible to increase the transmission opportunity of a low-priority CSI report that will have fewer transmission opportunities.

Regarding (3) above, for example, the UE transmits an SP-CSI report corresponding to the earliest or latest resource (symbol) among a plurality of SP-CSI reports in the same slot, and drops the others. Good.

When the predetermined condition means that an SP-CSI report corresponding to the earliest resource is transmitted, the delay for CSI transmission can be reduced. When the predetermined condition means that an SP-CSI report corresponding to the slowest resource is transmitted, processing based on the latest CSI report can be secured.

Regarding (4) above, for example, the UE may transmit an SP-CSI report having the longest or shortest reporting period among a plurality of SP-CSI reports in the same slot, and drop others.

When the above-mentioned predetermined condition means that an SP-CSI report having the longest reporting cycle is transmitted, it is possible to guarantee transmission of the SP-CSI report with few transmission opportunities. When the predetermined condition means that an SP-CSI report having the shortest reporting cycle is transmitted, it is possible to secure transmission of the SP-CSI report considered to be important because of many transmission opportunities.

According to the embodiment described above, it is possible to appropriately determine the SP-CSI report to be transmitted even when there are a plurality of SP-CSI reports in the same slot.

<Another embodiment>
In another embodiment, if the UE has multiple SP-CSI reports in the same slot, the UE may drop all of the multiple SP-CSI reports based on the predetermined condition. Further, when the UE has a plurality of SP-CSI reports in the same slot, the UE may always perform control to drop all of the plurality of SP-CSI reports.

In addition, when the UE has a plurality of SP-CSI reports in the same slot, the UE may perform control to transmit the SP-CSI report having the smallest (or largest) setting ID among them.

Also, it may be assumed that the UE does not have multiple SP-CSI reports in the same slot (there is only one SP-CSI report per slot). The base station may configure, trigger, activate, etc. the SP-CSI report for the UE so that it does not have multiple SP-CSI reports in the same slot. That is, it may be prohibited for one slot to contain more than one PUSCH-based SP-CSI report.

In this case, the drop determination process in the same slot as described above may not be implemented in the UE, and a case where a setting having a plurality of SP-CSI reports in the same slot has become effective is considered. May be implemented in the UE.

Note that even if the UE transmits a PUCCH-based SP-CSI report on the PUSCH (piggyback), it may be prohibited that one slot includes more than one SP-CSI report. For example, if a UE transmits a PUCCH-based SP-CSI report on a PUSCH in a slot, more than one SP-CSI report may be active in the same slot regardless of the PUCCH base and the PUSCH base You do not have to expect.

The UE may assume that when multiple SP-CSI reports are active at the same time, one reporting period of these SP-CSI reports is an integral multiple of the other reporting period. For example, the UE may assume that the reporting periods of all configured SP-CSI reports are the same. Further, the UE may assume that an arbitrary report period of the SP-CSI report to be set is an integer multiple of the minimum report period.

The UE may assume that when multiple SP-CSI reports are active at the same time, all the offset values of these SP-CSI reports are different.

<Modification>
In each of the above-described embodiments, the case of having a plurality of SP-CSI reports in the same slot has been described. However, it may be replaced by any combination of CSI reports. For example, each of the above embodiments is applicable to a case where the UE has an arbitrary plurality of CSI reports among an A-CSI report, an SP-CSI report, and a P-CSI report in the same slot.

That is, “SP-CSI” in the present disclosure may be read as “at least one of A-CSI, SP-CSI, and P-CSI”. Also, “SP-CSI” in the present disclosure may be read as “at least one of PUCCH-based SP-CSI and PUSCH-based SP-CSI”.

In addition, each of the above embodiments may be applied to a case where there are a plurality of SP-CSI reports in the same slot of one CC, or a plurality of SP-CSIs in the same slot of a plurality of CCs (eg, all CCs) It may be applied if you have a report.

(Wireless communication system)
Hereinafter, the configuration of the wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above-described embodiments of the present disclosure.

FIG. 2 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. In the wireless communication system 1, at least one of carrier aggregation (CA) and dual connectivity (DC) in which a plurality of fundamental frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit is integrated. Can be applied.

The wireless communication system 1 includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced 4G (4th generation mobile communication system), 5G. (5th generation mobile communication system), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or a system that realizes these.

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

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

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

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

Numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel, for example, subcarrier interval, bandwidth, symbol length, cyclic prefix length, subframe length, At least one of a TTI length, the number of symbols per TTI, a radio frame configuration, a specific filtering process performed by the transceiver in the frequency domain, and a specific windowing process performed by the transceiver in the time domain may be indicated.

For example, when at least one of the subcarrier interval and the number of OFDM symbols of a configured OFDM symbol is different for a certain physical channel, it may be referred to as having a different neurology.

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

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

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

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

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

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

In the wireless communication system 1, a downlink shared channel (PDSCH: Physical Downlink Shared Channel), a broadcast channel (PBCH: Physical Broadcast Channel), a downlink control channel, and the like that are shared by the user terminals 20 are used as downlink channels. User data, higher layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. Moreover, MIB (Master Information Block) is transmitted by PBCH.

Downlink control channels include PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical 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 at least one of scheduling information of PDSCH and PUSCH is transmitted by PDCCH.

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

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

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

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

(Radio base station)
FIG. 3 is a diagram illustrating an example of the overall configuration of a radio base station according to an embodiment. The radio base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. Note that the transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may each be configured to include one or more.

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

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

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

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

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

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

FIG. 4 is a diagram illustrating an example of a functional configuration of the radio base station according to the embodiment. In addition, in this example, the functional block of the characteristic part in this embodiment is mainly shown, and it may be assumed that the wireless 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. These configurations may be included in the radio base station 10, and a part or all of the configurations may not be included in the baseband signal processing unit 104.

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

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

The control unit 301 schedules system information, downlink data signals (for example, signals transmitted using a downlink shared channel), and downlink control signals (for example, signals transmitted using a downlink control channel) (for example, resource allocation). ) To control. In addition, the control unit 301 controls generation of a downlink control signal, a downlink data signal, and the like based on a result of determining whether or not retransmission control is necessary for the uplink data signal.

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

The control unit 301 includes an uplink data signal (for example, a signal transmitted using an uplink shared channel), an uplink control signal (for example, a signal transmitted using an uplink control channel), a random access preamble, an uplink reference signal, and the like. Control scheduling.

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

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

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

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

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

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

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

The transmission / reception unit 103 may transmit information related to the setting of a plurality of semi-persistent channel state information reports (SP-CSI reports) (for example, RRC CSI-ReportConfig information element (IE: Information Element)). . The transmission / reception unit 103 may receive the CSI transmitted from the user terminal 20.

In addition, when the user terminal 20 has a plurality of SP-CSI reports in the same slot, the control unit 301 assumes that at least one of the plurality of SP-CSI reports is dropped based on a predetermined condition. (For example, decoding, demodulation, demapping, etc.) may be performed.

(User terminal)
FIG. 5 is a diagram illustrating an example of an overall configuration of a user terminal according to an embodiment. The user terminal 20 includes a plurality of transmission / reception antennas 201, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205. Note that the transmission / reception antenna 201, the amplifier unit 202, and the transmission / reception unit 203 may each be configured to include one or more.

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

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

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

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

FIG. 6 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment. In addition, in this example, the functional block of the characteristic part in this embodiment is mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication.

The baseband signal processing unit 204 included in the user terminal 20 includes at least a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. Note that these configurations may be included in the user terminal 20, and some or all of the configurations may not be included in the baseband signal processing unit 204.

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

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

The control unit 401 acquires the downlink control signal, the downlink data signal, and the like transmitted from the radio base station 10 from the received signal processing unit 404. As a result of determining whether or not retransmission control is required for the downlink data signal, the control unit 401 controls generation of an uplink control signal, an uplink data signal, and the like based on the downlink control signal and the like.

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

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

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

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

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

The reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401. The reception signal processing unit 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401. The reception signal processing unit 404 outputs at least one of the reception signal and the signal after reception processing to the measurement unit 405.

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

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

The transmission / reception unit 203 may receive information related to the setting of a plurality of semi-persistent channel state information reports (SP-CSI reports) (for example, an RRC CSI-ReportConfig information element (IE)). . The transmission / reception unit 203 may transmit CSI to the radio base station 10.

In addition, when the control unit 401 has a plurality of SP-CSI reports in the same slot, the control unit 401 may drop at least one of the plurality of SP-CSI reports based on a predetermined condition.

Here, the predetermined condition may include a condition related to a payload size of SP-CSI for the plurality of SP-CSI reports. The predetermined condition may include a condition related to the priority of SP-CSI for the plurality of SP-CSI reports. The predetermined condition may include a condition regarding a temporal position (for example, a symbol position) of an SP-CSI report resource in a slot for the plurality of SP-CSI reports. The predetermined condition may include a condition related to an SP-CSI report period for the plurality of SP-CSI reports.

Also, the control unit 401 may assume that one reporting period of the plurality of SP-CSI reports is an integer multiple of the other reporting period.

(Hardware configuration)
In addition, the block diagram used for description of the said embodiment has shown the block of the functional unit. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device physically or logically coupled, or two or more devices physically or logically separated may be directly or indirectly (for example, (Using wired, wireless, etc.) and may be implemented using these multiple devices.

For example, a wireless base station, a user terminal, and the like according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. FIG. 7 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment. The wireless base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. Good.

In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configurations of the radio base station 10 and the user terminal 20 may be configured to include one or a plurality of each device illustrated in the figure, or may be configured not to include some devices.

For example, although only one processor 1001 is shown, there may be a plurality of processors. Further, the processing may be executed by one processor, or the processing may be executed by two or more processors simultaneously, sequentially, or using other methods. Note that the processor 1001 may be implemented by one or more chips.

Each function in the radio base station 10 and the user terminal 20 is calculated by causing the processor 1001 to perform calculations by reading predetermined software (programs) on hardware such as the processor 1001 and the memory 1002, for example, via the communication device 1004. This is realized by controlling communication or controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

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

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

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

The storage 1003 is a computer-readable recording medium such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM (Compact Disc ROM)), a digital versatile disk, Blu-ray® disk), removable disk, hard disk drive, smart card, flash memory device (eg, card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium It may be constituted by. The storage 1003 may be referred to as an auxiliary storage device.

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

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

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

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

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

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

Here, the neurology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology includes, for example, subcarrier spacing (SCS: SubCarrier Spacing), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI: Transmission Time Interval), number of symbols per TTI, radio frame configuration, transmission / reception It may indicate at least one of a specific filtering process performed by the machine in the frequency domain and a specific windowing process performed by the transceiver in the time domain.

A slot may be configured with one or a plurality of symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time domain. Further, the slot may be a time unit based on the numerology.

The slot may include a plurality of mini slots. Each minislot may be configured with one or more symbols in the time domain. The minislot may also be called a subslot. A mini-slot may be composed of fewer symbols than slots. PDSCH (or PUSCH) transmitted in units of time larger than a minislot may be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be referred to as a PDSCH (PUSCH) mapping type B.

Radio frame, subframe, slot, minislot, and symbol all represent time units when transmitting signals. Different names may be used for the radio frame, subframe, slot, minislot, and symbol. Note that time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchanged.

For example, one subframe may be called a transmission time interval (TTI), a plurality of consecutive subframes may be called a TTI, and one slot or one minislot is called a TTI. May be. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. It may be. Note that a unit representing TTI may be called a slot, a minislot, or the like instead of a subframe.

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

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

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

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

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

A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in the RB may be the same regardless of the neurology, and may be 12, for example. The number of subcarriers included in the RB may be determined based on the neurology.

In addition, the RB may include one or a plurality of symbols in the time domain, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. Each 1 TTI, one subframe, and the like may be configured by one or a plurality of resource blocks.

One or more RBs include physical resource blocks (PRB), sub-carrier groups (SCG), resource element groups (REG), PRB pairs, RB pairs, etc. May be called.

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

Bandwidth part (BWP: Bandwidth Part) (may be called partial bandwidth etc.) represents a subset of continuous common RB (common resource blocks) for a certain neurology in a certain carrier. Good. Here, the common RB may be specified by an RB index based on the common reference point of the carrier. A PRB may be defined in a certain BWP and numbered in the BWP.

BWP may include UL BWP (UL BWP) and DL BWP (DL BWP). One or more BWPs may be set in one carrier for the UE.

At least one of the set BWPs may be active, and the UE may not assume that a predetermined signal / channel is transmitted / received outside the active BWP. Note that “cell”, “carrier”, and the like in the present disclosure may be read as “BWP”.

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

Further, information, parameters, and the like described in the present disclosure may be expressed using absolute values, may be expressed using relative values from predetermined values, or may be expressed using other corresponding information. May be represented. For example, the radio resource may be indicated by a predetermined index.

The names used for parameters and the like in this disclosure are not limited names in any way. Further, mathematical formulas and the like that use these parameters may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements can be identified by any suitable name, so various names assigned to these various channels and information elements. Is not a restrictive name in any respect.

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

In addition, information, signals, and the like can be output from the upper layer to at least one of the lower layer and the lower layer to the upper layer. Information, signals, and the like may be input / output via a plurality of network nodes.

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

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

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

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

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

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

Also, software, instructions, information, etc. may be transmitted / received via a transmission medium. For example, the software uses websites using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.) When transmitted from a server or other remote source, at least one of these wired and wireless technologies is included within the definition of a transmission medium.

The terms “system” and “network” as used in this disclosure may be used interchangeably.

In the present disclosure, “base station (BS)”, “radio base station”, “fixed station”, “NodeB”, “eNodeB (eNB)”, “gNodeB (gNB)”, “ "Access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", Terms such as “carrier”, “component carrier” and the like may be used interchangeably. A base station may also be called terms such as a macro cell, a small cell, a femto cell, and a pico cell.

The base station can accommodate one or a plurality of (for example, three) cells. If the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, an indoor small base station (RRH: Remote Radio Head)) can also provide communication services. The terms “cell” or “sector” refer to part or all of the coverage area of at least one of a base station and a base station subsystem that provides communication services in this coverage.

In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user equipment (UE)”, and “terminal” may be used interchangeably. .

Mobile station, 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, remote terminal , Handset, user agent, mobile client, client or some other suitable term.

At least one of the base station and the mobile station may be referred to as a transmission device, a reception device, or the like. Note that at least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The moving body may be a vehicle (for example, a car, an airplane, etc.), an unattended moving body (for example, a drone, an autonomous driving vehicle, etc.), or a robot (manned or unmanned). ). Note that at least one of the base station and the mobile station includes a device that does not necessarily move during a communication operation.

Further, the radio base station in the present disclosure may be replaced with a user terminal. For example, the communication between the radio base station and the user terminal is replaced with communication between a plurality of user terminals (for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc. may be called)) For each configuration, each aspect / embodiment of the present disclosure may be applied. In this case, the user terminal 20 may have a function that the wireless base station 10 has. In addition, words such as “up” and “down” may be read as words corresponding to communication between terminals (for example, “side”). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

Similarly, the user terminal in the present disclosure may be replaced with a radio base station. In this case, the wireless base station 10 may have a function that the user terminal 20 has.

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

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

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

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

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

The term “determining” as used in this disclosure may encompass a wide variety of actions. For example, “determination (decision)” includes determination, calculation, calculation, processing, derivation, investigating, looking up (eg, table, (Searching in a database or another data structure), ascertaining, etc. may be considered to be “determining”.

In addition, “determination (decision)” includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), access ( accessing) (e.g., accessing data in memory), etc. may be considered to be "determining".

Also, “determination” is considered to be “determination (resolving)”, “selecting”, “choosing”, “establishing”, “comparing”, etc. Also good. That is, “determination (determination)” may be regarded as “determination (determination)” of some operation.

Also, “judgment (decision)” may be read as “assuming”, “expecting”, “considering”, and the like.

As used in this disclosure, the terms “connected”, “coupled”, or any variation thereof, is any direct or indirect connection or coupling between two or more elements. 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”.

In the present disclosure, when two elements are connected, using one or more wires, cables, printed electrical connections, etc., as well as some non-limiting and non-inclusive examples, radio frequency domain, microwave It can be considered to be “connected” or “coupled” to each other using electromagnetic energy having a wavelength in the region, light (both visible and invisible) region, and the like.

In the present disclosure, the term “A and B are different” may mean “A and B are different from each other”. The term may mean “A and B are different from C”. Terms such as “leave”, “coupled” and the like may also be interpreted similarly to “different”.

In this disclosure, where “include”, “including” and variations thereof are used, these terms are inclusive, as are the terms “comprising”. Is intended. Further, the term “or” as used in this disclosure is not intended to be an exclusive OR.

In the present disclosure, for example, when articles are added by translation such as a, an, and the in English, the present disclosure may include plural nouns that follow these articles.

Although the invention according to the present disclosure has been described in detail above, it is obvious for those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented 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 of the present disclosure is for illustrative purposes and does not give any restrictive meaning to the invention according to the present disclosure.

Claims

A receiving unit for receiving information on setting of a plurality of semi-persistent channel state information reports (SP-CSI (Semi-Persistent Channel State Information) reports);
And a control unit that drops at least one of the plurality of SP-CSI reports based on a predetermined condition when a plurality of SP-CSI reports are included in the same slot.
The user terminal according to claim 1, wherein the predetermined condition includes a condition related to a payload size of SP-CSI for the plurality of SP-CSI reports.
3. The user terminal according to claim 1, wherein the predetermined condition includes a condition related to a priority of SP-CSI for the plurality of SP-CSI reports.
The predetermined condition includes a condition related to a temporal position of a resource for SP-CSI reporting in a slot for the plurality of SP-CSI reports. User terminal.
The user terminal according to any one of claims 1 to 4, wherein the predetermined condition includes a condition related to an SP-CSI report period for the plurality of SP-CSI reports.
6. The user according to claim 1, wherein the control unit assumes that one reporting period of the plurality of SP-CSI reports is an integer multiple of the other reporting period. Terminal.