WO2019220643A1

WO2019220643A1 - User terminal and wireless base station

Info

Publication number: WO2019220643A1
Application number: PCT/JP2018/019401
Authority: WO
Inventors: 一樹武田; 聡永田; リフェワン; ギョウリンコウ
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2018-05-18
Filing date: 2018-05-18
Publication date: 2019-11-21

Abstract

This user terminal comprises: a receiving unit which receives a downlink signal in first resources assigned to a first downlink signal to the user terminal, and a control unit which, if the aforementioned first resources include second resources assigned to a second downlink signal to the user terminal, decodes the first downlink signal on the basis of the downlink signal received in resources in the first resources excluding the second resources.

Description

User terminal and radio base station

The present invention relates to a user terminal and a radio base station in a next-generation mobile communication system.

In the UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) has been specified for the purpose of higher data rates and lower delay (Non-Patent Document 1). Also, LTE-A (also referred to as LTE Advanced, LTE Rel. 10-13, etc.) has been specified for the purpose of further widening and speeding up from LTE (also referred to as LTE Rel. 8 or 9), and LTE Successor systems (for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), NR (New RAT: Radio Access Technology), LTE Rel. 14 ~) are also being studied.

In the existing LTE system (for example, before Rel.13), adaptive modulation coding that adaptively changes at least one of a modulation scheme, a transport block size (TBS), and a coding rate as link adaptation. (AMC: Adaptive Modulation and Coding) is performed. Here, TBS is the size of a transport block (TB), which is a unit of an information bit sequence. One subframe is assigned to one subframe.

Further, in the existing LTE system, when the TBS exceeds a predetermined threshold (for example, 6144 bits), the TB is divided into one or more segments (code block (CB: Code Block)), and encoding in segment units is performed. Performed (Code Block Segmentation). Each encoded code block is concatenated and transmitted.

Further, in the existing LTE system, DL signal and / or UL signal retransmission control (HARQ: Hybrid Automatic Repeat reQuest) is performed in units of TB. Specifically, in the existing LTE system, even when the TB is divided into a plurality of CBs, retransmission control information (ACK (Acknowledge) or NACK (Negative ACK) (hereinafter referred to as A / N) in units of TB. Abbreviated), also referred to as HARQ-ACK or the like).

In future wireless communication systems (for example, 5G, NR, etc.), for example, high speed and large capacity (for example, eMBB: enhanced Mobile Broad Band), very large number of terminals (for example, mMTC: massive Machine Type Communication, IoT: Internet of Things) ), Multiple services (also referred to as use cases, communication types, etc.) with different communication requirements (such as URLLC: Ultra Reliable and Low Latency Communications) are expected to be mixed.

Also, in order to satisfy the communication requirement for delay reduction and / or reliability, it is assumed that preemption (preemption, interruption, interruption, interruption) occurs between a plurality of DL signals corresponding to different services. If preemption is not performed properly, system performance may be degraded.

The present invention has been made in view of this point, and an object of the present invention is to provide a user terminal and a radio base station capable of appropriately performing preemption between a plurality of DL signals.

A user terminal according to an aspect of the present invention includes: a reception unit that receives a downlink signal in a first resource assigned to a first downlink signal to the user terminal; and the first resource is a second resource to the user terminal. A control unit that decodes the first downlink signal based on a downlink signal received in a resource excluding the second resource among the first resources when the second resource allocated to the downlink signal is included. It is characterized by that.

According to the present invention, preemption can be appropriately performed between a plurality of DL signals.

1A and 1B are diagrams illustrating an example of preemption. 2A and 2B are diagrams illustrating an example of preemption between a plurality of DL signals to a plurality of UEs. 3A and 3B are diagrams illustrating an example of preemption between a plurality of DL signals to one UE. It is a figure which shows an example of the preemption during the some DL signal to one UE with a preemption instruction | indication. It is a figure which shows an example of schematic structure of the radio | wireless communications system which concerns on this Embodiment. It is a figure which shows an example of the whole structure of the wireless base station which concerns on this Embodiment. It is a figure which shows an example of a function structure of the radio base station which concerns on this Embodiment. It is a figure which shows an example of the whole structure of the user terminal which concerns on this Embodiment. It is a figure which shows an example of a function structure of the user terminal which concerns on this Embodiment. It is a figure which shows an example of the hardware constitutions of the radio base station and user terminal which concern on this Embodiment.

In future wireless communication systems (for example, 5G or NR), for example, high speed and large capacity (for example, eMBB: enhanced Mobile Broad Band), very large number of terminals (for example, mMTC: massive Machine Type Communication, IoT: Internet of Things) Multiple services (also referred to as use cases, communication types, communications, etc.) with different communication requirements (requirements) such as ultra-high reliability and low latency (for example, URLLC: Ultra Reliable and Low Latency Communications) are assumed. The communication requirement may be related to at least one of delay, reliability, capacity (capacity), speed, and performance, for example.

For example, the difference between the URLLC communication requirement and the eMBB communication requirement may be that the URLLC latency may be smaller than the eMBB latency, or the URLLC communication requirement may include a reliability communication requirement. Good. For example, the eMBB U-plane latency requirement may include a downlink U-plane latency of 4 ms and an uplink U-plane latency of 4 ms. On the other hand, URLLC U-plane latency requirements may include a downlink U-plane latency of 0.5 ms and an uplink U-plane latency of 0.5 ms. The URLLC reliability requirement may also include a 32-byte error rate of 10 ⁻⁵ at 1 ms U-plane latency.

For services that require ultra-high reliability and low delay, such as URLLC, a short TTI (shortened TTI) that is a TTI having a relatively short time length is suitable. In short TTI, end-to-end short delay (eg, frame fragmentation delay and / or transmission (Tx) delay, etc.) and / or high reliability due to short round trip time (ie short term) This is because re-transmission between them is supported.

On the other hand, a long TTI, which is a TTI having a relatively long time length, is suitable for a service that requires high speed and large capacity such as eMBB. This is because long TTI has little overhead due to control signals.

Therefore, in future wireless communication systems, it is considered that long TTIs and short TTIs having different time lengths are supported simultaneously (within the same carrier (cell, component carrier (CC))). The long TTI may be composed of, for example, 14 symbols in a subcarrier interval of 15 kHz and a normal cyclic prefix (NCP: Normal Cyclic Prefix). The long TTI may be called a normal TTI (normal TTI), a subframe, or the like.

Also, the short TTI may be configured with the same number of symbols as the long TTI and a shorter number of symbols than the long TTI (for example, the subcarrier interval is 15 kHz, 1 or 2 symbols in NCP). Alternatively, the short TTI may be configured with the same or different number of symbols as the long TTI with a higher (wider) subcarrier interval than the long TTI (for example, 14 symbols in a subcarrier interval of 60 kHz and NCP). Alternatively, a short TTI may be realized by a combination of both.

TTI may be some symbols, some minislots, some slots, etc.

In future wireless communication systems, it is considered that long TTI and short TTI are supported in order to satisfy requirements for different services (for example, eMBB, URLLC, etc.). If long TTI and short TTI are supported, it is assumed that the short TTI is scheduled after the start of transmission in the long TTI in order to meet the requirements for delay reduction and / or reliability. Specifically, it is assumed that a part of the DL data of the long TTI is preempted (also referred to as hollow or puncture) and the DL data of the short TTI is inserted.

When a part of the long TTI is preempted by the short TTI, the radio base station may puncture and transmit the part where the short TTI is scheduled with respect to the data of the long TTI. Therefore, there arises a problem that the user terminal that receives the long TTI data cannot appropriately receive the long TTI data (for example, demodulation and / or decoding) (see FIG. 1A).

In this case, the user terminal determines that the data of the long TTI is a detection error (decoding failure), but cannot recognize that the data has been punctured by the short TTI. For this reason, the user terminal determines that the data scheduled in the short TTI (interrupted short TTI data) is also the data addressed to the user terminal, and stores the data in the UE buffer (soft buffer). When data not addressed to the UE is accumulated in the UE buffer, the performance of the decoding process is degraded when decoding is performed by combining the long TTI data received by retransmission and the data accumulated in the soft buffer, and / or Decryption failure may occur.

Therefore, it is considered that the radio base station transmits the instruction information regarding the preemption of the long TTI by the short TTI to the user terminal of the long TTI (see FIG. 1B). The instruction information related to preemption may be called preemption instruction (preemption indication: PI, interrupted transmission instruction), preemption instruction information, puncture instruction information, punctured resource information, or impacted resource information.

The preemption instruction may be transmitted in DCI format 2_1. The DCI format 2_1 may be used for notification of preemption resources (eg, at least one PRB and at least one OFDM symbol). The UE may perform DL signal decoding assuming that there is no transmission to the UE in this resource. The DCI format 2_1 may include a CRC (Cyclic Redundancy Check) scrambled by INT (interruption) -RNTI (Radio Network Temporary Identifier). Several preemption instructions (fields) may be transmitted by the DCI format 2_1. The size of the DCI format 2_1 may be set by an upper layer.

When the UE is provided with higher layer parameters (for example, Preemp-DL and Preemp-DL = ON, DownlinkPreemption) indicating that preemption is performed on the DL signal, the UE performs INT-RNTI according to the higher layer parameter (for example, INT-RNTI). May be set.

When the UE detects the DCI format 2_1 in the PDCCH transmitted in the CORESET (control resource set), the resource (several symbols) indicated in the field in the DCI format 2_1 is a symbol before the CORESET. May be included. Each bit of the field in DCI format 2_1 may be mapped to a resource (at least one of several symbols and several PRBs) to indicate whether there is a transmission to the UE on the corresponding resource.

When a preemption occurs for a DL signal to the user terminal, the user terminal is likely to fail to decode the DL signal and cause retransmission of the DL signal. The user terminal accumulates the received DL signal in a buffer, synthesizes all DL signals including initial transmission of DL signals and several retransmissions, and decodes the synthesized result. The user terminal can improve the decoding performance by recognizing the preemption part and reducing the influence of this part on the decoding.

The user terminal can recognize that a part of the long TTI data is punctured by the preemption instruction notified from the radio base station. By notifying the user terminal of the punctured portion, the user terminal can select only the data addressed to itself and store it in the UE buffer. For example, the user terminal removes (flushes, discards) the soft bits in the data area corresponding to the puncture part (for example, replaces the log likelihood ratio (LLR) with zero (0)) and the soft buffer. Control the accumulation to.

Also, it is conceivable that multiple UEs use different services (communication requirements). In this case, it is conceivable to perform preemption between a plurality of DL signals for a plurality of UEs.

For example, assume that UE1 supports eMBB and URLLC, UE2 supports only URLLC, and UE3 supports only eMBB.

The communication requirements may include eMBB, URLLC, and combinations thereof, for example. Communication requirements include setting information (for example, MCS (Modulation and Code Scheme) table, CQI (Channel Quality Indication) table, neurology, frequency band, frequency range, higher layer parameters, DCI) to meet the communication requirements. Field, DCI format, etc.).

URLLC data may be PDSCH based on setting information for URLLC. The eMBB data may be a PDSCH based on eMBB setting information. At least a part of the setting information may be different between URLLC and eMBB. The setting information for eMBB and the setting information for URLCC may be defined in the specification.

The setting information may be at least one of an MCS (Modulation and Code Scheme) table and a CQI (Channel Quality Indication) table. Each entry in the MCS table includes at least one of an MCS index (IMCS) that identifies the entry, a modulation order (Qm), a target coding rate (target code rate, R), and a spectral efficiency (spectral efficiency). But you can.

Suppose that UE1 and UE3 supporting eMBB are set to monitor PI.

As shown in FIG. 2A, when transmitting the URLLC data to UE1 and the URLLC data to UE2 during the eMBB data transmission to UE3, the radio base station transmits a preemption instruction (PI) after the transmission of these data. ). This preemption instruction indicates resources (at least one of a time resource and a frequency resource) of URLLC data to UE1 and URLLC data to UE2.

UE3 may remove the soft bits corresponding to the URLLC data to UE1 and the URLLC data to UE2 from the buffer (soft buffer) based on the preemption instruction. UE3 may decode the eMBB data to UE3 using the soft bit in the buffer, or synthesizes this soft bit and the soft bit corresponding to the eMBB data to UE3 to be retransmitted later to UE3. The eMBB data may be decoded.

As shown in FIG. 2A, when transmitting the URLLC data to UE2 during the transmission of eMBB data to UE1, the radio base station transmits a preemption instruction after transmitting the data. This preemption instruction indicates a resource of URLLC data to UE 2 (at least one of a time resource and a frequency resource).

UE1 may remove the soft bit corresponding to the URLLC data to UE2 from the buffer based on the preemption instruction. UE1 may decode the eMBB data to UE1 using the soft bit in the buffer, or synthesizes this soft bit and the soft bit corresponding to the eMBB data to UE1 to be retransmitted later to UE1. The eMBB data may be decoded.

Also, it is conceivable that one UE uses a plurality of services (communication requirements). In this case, it is conceivable to perform preemption between a plurality of DL signals for one UE. However, there is a problem of how to perform preemption between a plurality of DL signals for one UE.

The present inventors have conceived a method of appropriately performing preemption between a plurality of DL signals for one UE.

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

In this embodiment, a DL data channel (for example, PDSCH: Physical Downlink Shared Channel) is assumed as the DL signal, but is not limited thereto. For example, the retransmission control according to the present embodiment can be applied to retransmission control such as a random access response (RAR).

<First aspect>
Preemption between a plurality of DL signals addressed to the same UE (in-UE preemption, intra-UE preemption) may not be accompanied by a preemption instruction.

The UE may process preemption between a plurality of DL signals for the UE without setting monitoring of the preemption instruction. When such preemption is performed, since the UE receives DCI for scheduling of each of the plurality of DL signals, the UE recognizes resources allocated to each of the plurality of DL signals even if there is no preemption instruction. The preempted DL signal can be processed. The DCI for scheduling of each DL signal may be received before the corresponding DL signal. The DCI for scheduling each DL signal may have a DCI format 1_0, 1_1, etc.

When the UE detects the second DL signal having the second communication requirement in the resource overlapping the resource allocated to the first DL signal having the first communication requirement, the UE performs the second DL signal when decoding the first DL signal. Decoding may be performed by ignoring soft bits generated from overlapping resources. Further, when the UE fails to decode the first DL signal, the UE removes the soft bit generated from the resource in which the second DL signal overlaps (or zero) when storing the soft bit in the buffer (soft buffer). And may be controlled to be stored in the buffer. When the retransmission of the first DL signal is performed, the UE may decode the first DL signal based on the soft bits in the buffer, or the soft bits in the buffer and the soft bits of the first DL signal retransmitted later May be combined and decoded.

Alternatively, when the UE detects the second DL signal in the resource overlapping with the resource allocated to the first DL signal, the soft bit generated from the resource overlapping the second DL signal when decoding the second DL signal You may perform decoding using. In addition, when the UE fails to decode the first DL signal, the UE may decode the second DL signal based on the soft bit generated from the resource in which the second DL signal overlaps in storing the soft bit in the buffer. Good. Thereafter, the UE may remove the soft bit from the buffer and decode the first DL signal based on the soft bit in the buffer, or the soft bit in the buffer and the soft bit of the first DL signal retransmitted later May be combined and decoded.

For example, in FIG. 3A, UE1 supports eMBB and URLLC. When UE1 detects URLLC data (traffic) in a resource overlapping with the resource of the eMBB data being received, UE1 may remove the soft bit corresponding to the URLLC data from the soft bits in the buffer. In this case, the eMBB data may be decoded based on the soft bits in the buffer, or the soft bits in the buffer and the soft bits of the eMBB data retransmitted later may be combined and decoded.

Alternatively, when the UE1 detects URLLC data in a resource overlapping with the resource of the eMBB data being received, the UE1 may decode the URLLC data based on the soft bits corresponding to the URLLC data among the soft bits in the buffer. . Thereafter, UE1 may remove the soft bit from the buffer and decode the eMBB data based on the soft bit in the buffer, or may combine the soft bit in the buffer and the soft bit of the eMBB data retransmitted later. And may be decrypted.

When preemption is performed on the retransmitted DL signal, a part of the retransmitted DL signal may be removed, which may degrade the decoding performance.

Therefore, preemption between a plurality of DL signals addressed to the same UE is permitted for the initial transmission of the DL signal and may not be permitted for the retransmission of the DL signal.

The UE may not expect to receive the first DL signal preempted (interrupted) by the second DL signal when the first DL signal is a retransmission. The first DL signal and the second DL signal may have different services (communication requirements). When the UE supports both eMBB and URLLC (both eMBB and URLLC are set), the first DL signal may be eMBB data (PDSCH), for example. The second DL signal may be URLLC data (PDSCH).

The DCI for scheduling of the first DL signal may include HARQ information (at least one of NDI (New Data Indicator), RV (Redundancy Version), HARQ process ID (HARQ process number: HPN)). The UE may identify whether the first DL signal is an initial transmission or a retransmission based on the HARQ information.

For example, the UE may identify whether it is initial transmission or retransmission by NDI toggle. NDI is an identifier indicating either initial transmission or retransmission. For example, if NDI is not toggled in the same HPN (the same value as the previous time), it indicates retransmission, and if NDI is toggled (a value different from the previous time), it is the first transmission. Indicates. RV indicates a difference in redundancy of transmission data. The value of RV is, for example, 0, 1, 2, 3, and 0 is used for initial transmission because the degree of redundancy is the lowest. By applying a different RV value for each transmission of the same HPN, a HARQ gain can be effectively obtained.

Further, when receiving the NDI indicating the initial transmission for the same HPN, the UE may remove the soft bit corresponding to the HPN in the buffer.

The recognition of initial transmission or retransmission may not match between the radio base station and the UE. This is a case where the UE recognizes initial transmission when the radio base station performs retransmission. Since the radio base station does not perform preemption for retransmission, the UE does not need to perform special processing in this case.

Meanwhile, preemption between a plurality of DL signals addressed to different UEs may be accompanied by a preemption instruction. When the monitoring of the preemption instruction is not set, the UE may assume that the DL signal addressed to the UE is not preempted with the DL signal addressed to the other UE.

For example, as shown in FIG. 3B, when preemption of URLLC data addressed to UE2 is performed on eMBB data addressed to UE1, monitoring of a preemption instruction is set in UE1.

According to the first aspect described above, the overhead of control information can be suppressed and the resource utilization efficiency can be improved by not transmitting a preemption instruction for preemption between DL signals addressed to the same UE. it can. In addition, since preemption for DL signal retransmission is not performed, degradation in decoding performance can be prevented.

<Second aspect>
Preemption between a plurality of DL signals addressed to the same UE may be accompanied by a preemption instruction.

The radio base station may set monitoring of a preemption instruction for the UE when applying preemption for retransmission. The UE may process preemption between a plurality of DL signals addressed to the same UE based on the preemption instruction.

Also, the preemption instruction does not distinguish whether the data indicated in the preemption instruction is URLLC data or eMBB data. Therefore, the UE may not be able to decode URLLC data.

For example, as shown in FIG. 4, UE1 receives eMBB data, and receives URLLC data in the middle of eMBB data. When the preemption instruction indicates the resource of the URLLC data, it means that the preemption instruction is not transmitted to the UE1. Therefore, when the eMBB data is stored in the buffer, the UE1 generates eMBB data generated from the resource in which the URLLC data is duplicated. Remove soft bits. The soft bit storage of URLLC data may be performed independently of the soft bit storage of eMBB data. In this case, retransmission control and soft bit synthesis are also performed independently of eMBB data and URLLC data.

When UE group common signaling for performing a preemption instruction (UE group common DCI in UE group common PDCCH) is set, UE1 performs control so as not to synthesize soft bits generated from a specified resource in accordance with the preemption instruction. For example, the user terminal controls to delete the soft bit. In this case, data may be discarded based on the preemption instruction, and thus received data may not be correctly decoded.

Therefore, when a predetermined condition is satisfied, the UE may perform control so as not to remove the soft bit corresponding to the preemption. The predetermined condition may be that at least one of the following conditions 1 to 3 is satisfied.

(Condition 1)
DL signal with specific communication requirements is scheduled with specific DCI

The specific communication requirement may be URLLC. The DL signal may be data (PDSCH).

The specific DCI may have a new DCI format. The DCI format may be identified by a DCI format identifier field (for example, 1 bit) in DCI. The DCI format may be identified by a new DCIDCI format size. The DCI format may have a CRC scrambled with a specific RNTI (eg, URLLC-RNTI). The DCI format may be detected in the middle of the slot (it may not be detected at the beginning of the slot).

The specific DCI may be received before the DL signal having specific requirements. Alternatively, the specific DCI may be DCI obtained by scrambling the CRC with an RNTI different from the C-RNTI.

(Condition 2)
The DL signal having specific communication requirements and the resource indicated by the preemption instruction have a specific relationship

The specific relationship may be that the resource size R1 of the data is equal to or smaller than the resource size R2 indicated by the preemption instruction (R1 ≦ R2).

(Condition 3)
DL signal with specific communication requirements is PDSCH with mapping type B

In the case of applying mapping type A in PDSCH transmission, the PDSCH start position in the slot is selected from preset candidate symbols, and the number of PDSCH allocation symbols (PDSCH length) is within a range from a predetermined value (X) to 14. Selected. Candidate symbols that are candidates for the start position correspond to, for example, predetermined symbol indexes (for example, # 0, # 1, # 2, and # 3) in the slot. X may be 3, for example.

When mapping type B is applied to PDSCH transmission, the number of PDSCH allocation symbols (PDSCH length) is selected from the preset number of candidate symbols, and the start position of PDSCH in the slot is set to any location (symbol) in the slot. To do. The number of PDSCH-length candidate symbols corresponds to, for example, a predetermined number (2, 4, or 7 symbols). That is, the PDSCH start position is set flexibly.

The base station may set PDSCH start symbol (S) and data length (L) indication information (SLIV: Start and length indicator value), PDSCH mapping type combination candidate, and slot offset in the UE. The slot offset corresponds to an offset between a slot in which DCI is transmitted and a PDSCH slot scheduled by the DCI.

In a resource overlapping with the resource allocated to the first DL signal having the first communication requirement, preemption by the second DL signal having the second communication requirement is performed, and when the UE receives the preemption instruction and the predetermined condition is not satisfied, When decoding the first DL signal, the UE may perform the decoding by ignoring the soft bits generated from the resources in which the second DL signal overlaps. Further, when the decoding of the first DL signal fails, the UE removes the soft bit generated from the resource in which the second DL signal overlaps (or zero) when storing the soft bit in the buffer (soft buffer). It may be controlled to store in the buffer. When the retransmission of the first DL signal is performed, the UE may decode the first DL signal based on the soft bits in the buffer, or the soft bits in the buffer and the soft bits of the first DL signal retransmitted later May be combined and decoded.

In a resource overlapping with resources allocated to the first DL signal having the first communication requirement, preemption by the second DL signal having the second communication requirement is performed, and when the UE receives the preemption instruction and the predetermined condition is satisfied, When decoding the second DL signal, the UE may perform decoding using soft bits generated from resources in which the second DL signal overlaps. In addition, when the decoding of the first DL signal fails, the UE may decode the second DL signal based on the soft bit generated from the resource in which the second DL signal overlaps in storing the soft bit in the buffer. . Thereafter, the UE may remove the soft bit from the buffer and decode the first DL signal based on the soft bit in the buffer, or the soft bit in the buffer and the soft bit of the first DL signal retransmitted later May be combined and decoded.

According to the above 2nd aspect, even if transmission of the 1st DL signal to UE is resending, the preemption of the 2nd DL signal to the same UE can be performed with respect to a 1st DL signal. Also, even if the UE is the second DL signal indicated in the preemption instruction, the UE can appropriately decode the second DL signal by not removing the soft bits corresponding to the second DL signal under a predetermined condition.

(Wireless communication system)
Hereinafter, the configuration of a wireless communication system according to an embodiment of the present invention 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 embodiments of the present invention.

FIG. 5 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention. In the radio communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit are applied. can do.

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

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

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

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

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

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

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

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

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

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

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

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

Downlink L1 / L2 control 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 PDSCH and / or PUSCH scheduling information is transmitted by the PDCCH.

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

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

In the wireless communication system 1, as an uplink channel, an uplink shared channel (PUSCH) shared by each user terminal 20, an uplink control channel (PUCCH: Physical Uplink Control Channel), a random access channel (PRACH: Physical Random Access Channel) is used. User data, higher layer control information, etc. are transmitted by PUSCH. Also, downlink radio 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. 6 is a diagram illustrating an example of the overall configuration of a radio base station according to an embodiment of the present invention. 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. The transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may 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, which is described based on common recognition in the technical field according to the present invention. In addition, the transmission / reception part 103 may be comprised as an integral transmission / reception part, and may be comprised from a transmission part and a receiving part.

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

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

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

The transmission / reception unit 103 transmits a transport block (TB) including one or more code block groups (CBG) and receives a delivery confirmation signal corresponding to the TB and / or CBG. In addition, the transmission / reception unit 103 transmits information regarding the presence / absence of communication control notification based on CBG and the presence / absence of communication control notification based on the TB and / or CBG preemption instruction. In addition, the transmission / reception unit 103 transmits downlink control information including retransmission scheduling information and / or preemption instruction information of a predetermined CBG.

FIG. 7 is a diagram illustrating an example of a functional configuration of the radio base station according to the embodiment of the present invention. 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. Note that these configurations may be included in the radio base station 10, and some 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 part 301 can be comprised from the controller, the control circuit, or control apparatus demonstrated based on the common recognition in the technical field which concerns on this invention.

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 by PDSCH), downlink control signals (for example, signals transmitted by PDCCH and / or EPDCCH, delivery confirmation information, etc.) (for example, resource 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. Further, 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) and the like.

In addition, the control unit 301 includes an uplink data signal (for example, a signal transmitted on PUSCH), an uplink control signal (for example, a signal transmitted on PUCCH and / or PUSCH, delivery confirmation information, etc.), a random access preamble (for example, Scheduling of the uplink reference signal and the like.

The control unit 301 controls transmission and / or retransmission control based on CBG and scheduling using preemption. For example, the control unit 301 performs control so that retransmission scheduling information of the predetermined CBG and preemption instruction information are included in the downlink control information and transmitted.

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 invention.

The transmission signal generation unit 302 generates, for example, a DL assignment for notifying downlink data allocation information and / or a UL grant for notifying uplink data allocation information based on an instruction from the control unit 301. The DL assignment and UL grant are both DCI and follow the DCI format. 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 invention.

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 invention.

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

The measurement unit 305 performs measurement on the received signal. The measurement part 305 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.

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.

Further, the transmission / reception unit 103 may transmit the downlink signal in the first resource allocated to the first downlink signal to the user terminal 20. When the first resource includes a second resource allocated to a second downlink signal to the user terminal, the control unit 301 uses the first downlink signal in a resource excluding the second resource among the first resources. Transmission of the second downlink signal may be controlled in the second resource.

(User terminal)
FIG. 8 is a diagram illustrating an example of the overall configuration of a user terminal according to an embodiment of the present invention. 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. The transmission / reception antenna 201, the amplifier unit 202, and the transmission / reception unit 203 may 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 invention. 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.

The transmission / reception unit 203 receives a transport block (TB) including one or more code block groups (CBG) and transmits a delivery confirmation signal corresponding to the TB and / or CBG. In addition, the transmission / reception unit 203 receives information regarding the presence / absence of communication control notification based on CBG and the presence / absence of communication control notification based on the TB and / or CBG preemption instruction. Further, the transmission / reception unit 203 receives downlink control information including retransmission scheduling information and / or preemption instruction information of a predetermined CBG.

FIG. 9 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment of the present invention. 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 composed of a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.

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

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

The 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 invention.

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 invention.

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 invention. Further, the reception signal processing unit 404 can constitute a reception unit according to the present invention.

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

The measurement unit 405 performs measurement on the received signal. The measurement part 405 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.

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.

Further, the transmission / reception unit 203 may receive the downlink signal in the first resource allocated to the first downlink signal (for example, eMBB data) to the user terminal 20. When the first resource includes a second resource assigned to a second downlink signal to the user terminal 20 (for example, a second downlink signal having a communication requirement different from the communication requirement of the first downlink signal, URLLC data). The control unit 401 may decode the first downlink signal based on downlink signals (for example, soft bits) received in resources other than the second resource among the first resources.

The control unit 401 also includes first downlink control information for scheduling the first downlink signal (for example, DCI received before the first downlink signal, DCI having one of DCI formats 1_0, 1_1) and Second downlink control information for scheduling of the second downlink signal (e.g., DCI received before the second downlink signal, DCI having one of DCI formats 1_0, 1_1), and Resources may be determined.

In addition, when the transmission of the first downlink signal is retransmission, the control unit 401 may assume that the first resource does not include the second resource.

In addition, the control unit 401 may determine the resource based on instruction information (for example, preemption instruction, DCI having DCI format 2_1) received after the first resource.

In addition, the control unit 401 relates to downlink control information (for example, condition 1) for scheduling the second downlink signal, a second resource indicated in the downlink control information, and a resource indicated in the instruction information ( For example, the second downlink signal may be decoded based on at least one of condition 2) and a mapping type of the second downlink signal (for example, condition 3).

(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 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. 10 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 one or more processors simultaneously, sequentially, or using other methods. Note that the processor 1001 may be implemented by one or more chips.

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

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

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

Also, 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 and PUSCH transmitted in units of time larger than the minislot may be referred to as PDSCH / PUSCH mapping type A. The PDSCH and PUSCH transmitted using the minislot may be referred to as 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. 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, or a long subframe. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, or a subslot.

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

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

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

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

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

The information, signals, etc. described 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”, “Bandwidth Part (BWP)” 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 (also called sectors). If the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, an indoor small base station (RRH: Remote Radio Head)) can also provide communication services. The 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, the uplink channel 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. In addition, 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 in 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”. Terms such as “leave” and “coupled” may be interpreted in a similar manner.

Where the term “include”, “including”, and variations thereof are used in this disclosure or in the claims, these terms are similar to the term “comprising”. Intended to be comprehensive. Further, the term “or” as used in the present disclosure or the claims 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 user terminal,
A receiving unit for receiving a downlink signal in a first resource allocated to the first downlink signal to the user terminal;
When the first resource includes a second resource allocated to a second downlink signal to the user terminal, based on a downlink signal received in a resource excluding the second resource among the first resources, the And a control unit that decodes the first downlink signal.
The control unit determines the resource based on first downlink control information for scheduling the first downlink signal and second downlink control information for scheduling the second downlink signal. The user terminal according to claim 1, wherein:
The user terminal according to claim 2, wherein when the transmission of the first downlink signal is retransmission, the control unit assumes that the first resource does not include the second resource.
The user terminal according to claim 1, wherein the control unit determines the resource based on instruction information received after the first resource.
The control unit includes downlink control information for scheduling the second downlink signal, a relationship between a second resource indicated in the downlink control information and a resource indicated in the instruction information, and a mapping type of the second downlink signal The user terminal according to claim 4, wherein the second downlink signal is decoded based on at least one of the following.
A transmission unit that transmits a downlink signal in the first resource allocated to the first downlink signal to the user terminal;
When the first resource includes a second resource allocated to a second downlink signal to the user terminal, control of transmission of the first downlink signal in resources other than the second resource among the first resources. And a control unit that controls transmission of the second downlink signal in the second resource.