CN109661847B - Terminal, wireless communication method and system - Google Patents

Abstract

In the case of communication using multiple carriers of the same and/or different TTI length, the user terminal appropriately transmits UCI. The user terminal of the present invention comprises: a receiving unit receiving a Downlink (DL) shared channel; a transmission unit that transmits Uplink Control Information (UCI) including retransmission control information of the DL shared channel; and a control unit that controls transmission of the UCI based on allocation of a Transmission Time Interval (TTI) in one or more Uplink (UL) carriers having a same and/or different duration as a DL carrier receiving the DL shared channel.

Description

Terminal, wireless communication method and system

Technical Field

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

Background

In UMTS (universal mobile telecommunications system (Universal Mobile Telecommunications System)) networks, long term evolution (LTE: long Term Evolution) has been standardized for the purpose of further high-speed data rates, low latency, and the like (non-patent document 1). Further, for the purpose of further widening the bandwidth and improving the speed of LTE, subsequent systems of LTE (for example, also referred to as LTE-a (LTE-Advanced), FRA (future radio access (Future Radio Access)), 4G, 5g+ (plus), NR (New radio access technology), LTE rel.14, 15 to and the like) have been studied.

In the conventional LTE system (for example, LTE rel.10 and beyond), carrier aggregation (CA: carrier Aggregation) in which a plurality of carriers (component carriers (CC: component Carrier) and cells) are integrated is introduced to realize broadband. Each carrier is configured with the system band of LTE rel.8 as one unit. In CA, a plurality of CCs of the same radio base station (eNB: eNodeB) are set to a User Equipment (UE).

In addition, in the conventional LTE system (for example, LTE rel.12 and later), a dual connection (DC: dual Connectivity) is introduced in which a plurality of Cell groups (CG: cell Group) of different radio base stations are set for user terminals. Each cell group is composed of at least one carrier (CC, cell). Since a plurality of carriers of different radio base stations are integrated, DC is also called Inter-base station CA (Inter-eNB CA) or the like.

In addition, in existing LTE systems (e.g., LTE rel.8-13), a transmission time interval (TTI: transmission Time Interval) (also referred to as a subframe) of 1ms is used for Downlink (DL: downlink) and/or Uplink (UL: uplink) communications. The TTI of 1ms is a transmission time unit of 1 data packet channel-coded, and is a processing unit for scheduling, link adaptation, retransmission control (hybrid automatic repeat request-acknowledgement (HARQ-ACK: hybrid Automatic Repeat reQuest-Acknowledge)), and the like.

In addition, in the existing LTE system (e.g., LTE rel.8-13), uplink control information (UCI: uplink Control Information)) is transmitted using a UL shared channel (e.g., physical uplink shared channel (PUSCH: physical Uplink Shared Channel)) or a UL control channel (e.g., physical uplink control channel (PUCCH: physical Uplink Control Channel)).

Prior art literature

Non-patent literature

Non-patent document 1:3GPP TS 36.300 V8.12.0"Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); overall description; stage 2 (Release 8) ", 4 th 2010

Disclosure of Invention

Problems to be solved by the invention

In future wireless communication systems (e.g., LTE rel.14 or 15, 5G, NR, etc.), in order to reduce the delay (Latency reduction), TTIs supporting a different duration (TTI length) than the 1ms TTI of the existing LTE system (e.g., TTIs shorter than 1 ms) are being studied.

Further, in future wireless communication systems, it is envisaged that the user terminals communicate using multiple carriers (CCs, cells) of the same and/or different TTI length. However, in the existing LTE system, it is not assumed that the user terminal uses a plurality of carriers of different TTI lengths for communication. Therefore, when a user terminal uses a plurality of carriers having the same TTI length and/or different TTI lengths to communicate, if the UCI transmission method in the conventional LTE system is directly applied, UCI may not be appropriately transmitted.

The present invention has been made in view of the above-described problems, and an object thereof is to provide a user terminal and a radio communication method capable of appropriately transmitting UCI when communication is performed using a plurality of carriers having the same TTI length and/or different TTI lengths.

Means for solving the problems

An aspect of the present invention is a user terminal including: a receiving unit receiving a Downlink (DL) shared channel; a transmission unit that transmits Uplink Control Information (UCI) including retransmission control information of the DL shared channel; and a control unit that controls transmission of the UCI based on allocation of a Transmission Time Interval (TTI) in one or more Uplink (UL) carriers having a same and/or different duration as a DL carrier receiving the DL shared channel.

Effects of the invention

According to the present invention, a user terminal can appropriately transmit UCI in case of communicating using a plurality of carriers having the same and/or different TTI lengths.

Drawings

Fig. 1 is a diagram showing an example of a plurality of UL carriers having the same TTI length and different TTI lengths.

Fig. 2 is a diagram showing an example of the sTTI group according to embodiment 1.

Fig. 3 is a diagram illustrating an example of transmission control of UCI according to case 1 of embodiment 1.

Fig. 4 is a diagram illustrating an example of transmission control of UCI according to case 2 of embodiment 1.

Fig. 5 is a diagram showing an example of transmission control of UCI according to case 3 of embodiment 1.

Fig. 6 is a diagram illustrating an example of transmission control of UCI according to embodiment 2.

Fig. 7 is a diagram illustrating an example of transmission control of UCI according to embodiment 2.

Fig. 8 is a diagram showing an example of minimum timing of the pusch according to embodiment 3.

Fig. 9 is a diagram showing an example of transmission control of UCI according to instruction example 1 of embodiment 3.

Fig. 10 is a diagram showing an example of transmission control of UCI according to instruction example 2 of embodiment 3.

Fig. 11 is a diagram illustrating an example of transmission control of UCI according to embodiment 4.

Fig. 12A to 12D are diagrams showing an example of signaling according to embodiment 5.

Fig. 13 is a diagram showing an example of a schematic configuration of the radio communication system according to the present embodiment.

Fig. 14 is a diagram showing an example of the overall configuration of the radio base station according to the present embodiment.

Fig. 15 is a diagram showing an example of the functional configuration of the radio base station according to the present embodiment.

Fig. 16 is a diagram showing an example of the overall configuration of the user terminal according to the present embodiment.

Fig. 17 is a diagram showing an example of a functional configuration of a user terminal according to the present embodiment.

Fig. 18 is a diagram showing an example of a hardware configuration of a radio base station and a user terminal according to the present embodiment.

Detailed Description

In the existing LTE system, a user terminal uses a TTI of 1ms for DL and/or UL communication. A TTI of 1ms has a duration of 1 ms. A TTI of 1ms is also called TTI, subframe, normal TTI, long TTI, normal subframe, long subframe, etc., and is composed of 2 slots. In addition, a Cyclic Prefix (CP) is added to each symbol in a TTI of 1 ms.

In the conventional LTE system, when a normal CP (e.g., 4.76 μs) is added to each symbol, a TTI of 1ms includes 14 symbols (7 symbols per slot). On the other hand, when an extended CP (for example, 16.67 μs) longer than the normal CP is added to each symbol, the TTI of 1ms is configured to include 12 symbols (6 symbols per slot). Further, the duration of each symbol (symbol length) is 66.7 μs, and the subcarrier spacing is 15kHz. In addition, the symbol length and the subcarrier spacing are reciprocal relationships to each other.

On the other hand, in future wireless communication systems (for example, LTE rel.14 or 15, 5G, NR, etc.), it is desired to accommodate various services such as high-speed and high-capacity communication (enhanced mobile broadband (emmbb: enhanced Mobile Broad Band)), machine-to-Machine communication (M2M: machine-to-Machine) from IoT (internet of things (Internet of Things)) or MTC (Machine-type communication (Machine Type Communication)) and the like, mass connection (mMTC: active MTC) of devices (user terminals) for Machine-to-Machine, low-latency and high-reliability communication (URLLC: ultra-reliable and low latency communication), and the like in a single frame. In URLLC, a stronger delay reduction effect than emmbb or emtc is required.

Therefore, in future wireless communication systems, a TTI supporting a different time length from that of the 1ms TTI of the existing LTE system is being studied. For example, to reduce delay (Latency Reduction), it is being studied to support a TTI shorter than 1 ms. A TTI shorter than 1ms is also referred to as a shortened TTI, a short TTI, a shortened subframe, a short subframe, an sTTI, or the like (hereinafter referred to as sTTI).

For example, in frequency division duplexing (FDD: frequency Division Duplex) (also referred to as Frame Structure (FS) type 1, etc.), in DL, an sTTI of 2 symbols and/or an sTTI of 1 slot are being studied. In the UL, at least one of an sTTI of 2 symbols, an sTTI of 4 symbols, and an sTTI of 1 slot is being studied.

In addition, in time division duplexing (TDD: time Division Duplex) (also referred to as FS type 2, etc.), it is being studied to support sTTI of 1 slot in DL and UL and support sTTI of less than 1 slot after LTE rel.15 in LTE rel.14.

The sTTI of 1 slot may be configured to include 7 or 6 symbols as in the case of 1 slot of the conventional LTE system, or may be configured to include a different number of symbols. The symbol length of each symbol may be the same as or different from that of the conventional LTE system. In addition, a CP of a predetermined duration may or may not be added to at least one symbol in the sTTI. In addition, at least one symbol within an sTTI may also be shared with other sTTI.

Further, in future wireless communication systems, it is envisaged that user terminals communicate using multiple carriers (CCs, cells) of the same and/or different TTI length (e.g. Carrier Aggregation (CA) or Dual Connectivity (DC)). For example, it is contemplated that a user terminal communicates using multiple carriers of the same and/or different number of symbols of an sTTI (e.g., a carrier using an sTTI of 1 slot and a carrier using an sTTI of 2 symbols).

In addition, in a conventional LTE system (e.g., LTE rel.8-13), UCI is transmitted using a UL shared channel (hereinafter, also referred to as PUSCH) or a UL control channel (hereinafter, abbreviated as PUCCH). Here, UCI includes at least one of retransmission control information (e.g., also referred to as ACK or NACK (negative ACK (Negative ACK)) (hereinafter, abbreviated as a/N), HARQ-ACK, etc.), channel state information (CSI: channel State Information), and scheduling request (SR: scheduling Request) of a DL shared channel (e.g., physical downlink shared channel (PDSCH: physical Downlink Shared Channel), hereinafter, also referred to as PDSCH).

For example, in the conventional LTE system, when the user terminal receives the PDSCH in TTI #n, the user terminal transmits the a/N of the PDSCH in a TTI after a predetermined time (for example, TTI #n+4 after 4 ms). When a PUSCH is allocated in a TTI (for example, TTI #n+4) after the predetermined time, the user terminal transmits a/N using the PUSCH. On the other hand, when PUSCH is not allocated in the TTI (for example, TTI #n+4) after the predetermined time, the user terminal transmits a/N using PUCCH.

In the conventional LTE system, when the user terminal receives a transmission request (a-CSI trigger) for aperiodic CSI in tti#n, the user terminal transmits CSI using PUSCH in TTI (for example, tti#n+4 after 4 ms) after a predetermined time.

In addition, in the conventional LTE system (e.g., rel.13 ca), when a plurality of PUSCHs of different carriers (cells, CCs) are allocated in the same TTI, UCI is transmitted through a carrier of the smallest index number.

However, in the conventional LTE system, it is not assumed that a user terminal performs communication using a plurality of UL carriers having TTI lengths different from DL carriers. Therefore, when a user terminal uses one or more UL carriers having the same TTI length and/or different TTI length from DL carriers to communicate, if the UCI transmission method in the conventional LTE system is directly applied, UCI may not be appropriately transmitted.

Fig. 1 is a diagram showing an example of a plurality of carriers having the same TTI length and different TTI lengths. Fig. 1 shows a case where a user terminal performs UL communication (e.g., UL CA) using UL carrier (UL CC) 1 using sTTI of 1 slot (e.g., 7 symbols), UL carrier 2 using sTTI of 4 symbols, and UL carriers 3 and 4 using sTTI of 2 symbols.

Each of the carriers (including UL carrier and/or DL carrier) may include a plurality of sTTI each having a different symbol, or may include one or more symbols (shared symbols) shared among the plurality of sTTI. For example, in fig. 1, when the sTTI is configured of 1 slot or 2 symbols, the plurality of sTTI are each configured of different symbols. On the other hand, in the case where the sTTI is composed of 4 symbols, a shared symbol shared between 2 sTTI is set.

In the shared symbol, a demodulation reference signal (DMRS: deModulation Reference Signal) of a PUSCH of each of a plurality of sTTIs is arranged (shared DMRS (Shared DMRS)). For example, the DMRSs of the plurality of sTTI may be multiplexed in a shared symbol by Cyclic Shift (CS) and/or Comb-shaped subcarrier configuration (Comb). For example, in fig. 1, DMRS of the first half of sTTI and DMRS of the second half of sTTI within 1 slot are multiplexed through CS or combs.

In fig. 1, PUSCH is allocated to a user terminal in the 1 st and 4 th sTTI from the left of UL carrier 1. Further, PUSCH is allocated to the user terminal in the 1 st and 6 th sTTI from the left of UL carrier 2. Further, PUSCH is allocated to the user terminal in the 1 st and 9 th sTTI from the left of UL carriers 3 and 4. In addition, in order to distinguish the PUSCH allocated to the TTI of 1ms from the PUSCH allocated to the TTI of s, the PUSCH allocated to the TTI is also called a PUSCH.

In the case shown in fig. 1, it is envisaged that a plurality of sTTI of the same and/or different TTI length (sTTI length) are allocated the pusch for the same user terminal, respectively, at the same time. For example, in fig. 1, in the 1 st sTTI from the left of UL carriers 1 to 4 having different TTI lengths, a plurality of sfchs are repeatedly allocated to the same user terminal. In this case, among the pusch of the plurality of UL carriers, the pusch multiplexing UCI for which UL carrier becomes a problem.

In this way, when a user terminal performs communication using one or more UL carriers having the same TTI length and/or different TTI length from DL carriers, it becomes a problem at which timing to use which UL carrier to transmit UCI. Further, it is also a problem to allocate PUSCH of one or more UL carriers having TTI lengths identical to and/or different from DL carriers at which timing.

Accordingly, the present inventors have studied to transmit UCI methods using UL carriers having TTI lengths identical to and/or different from DL carriers receiving DL shared channels, and have achieved the present invention. Further, the present inventors studied the timing of PUSCH allocated for UL carriers having the same TTI length and/or different TTI length from DL carriers receiving UL grants, and achieved the present invention.

The present embodiment will be described in detail below. In the following, a case is assumed in which a user terminal performs Carrier Aggregation (CA) using a plurality of carriers having the same TTI length and/or different TTI lengths, but the present invention is not limited thereto. The present embodiment can also be suitably applied to a case where a user terminal performs Dual Connection (DC) using a plurality of carriers having the same and/or different TTI length (for example, a case where a plurality of carriers having the same and/or different TTI length are used in a Cell Group (CG)).

In the following, a communication using a plurality of carriers having the same or different sTTI length is shown, but in the communication according to the present embodiment, a carrier using TTI of 1ms may be used in addition to a carrier using sTTI. The present embodiment does not exclude the case where TTIs having different TTI lengths (including sTTI, TTI of 1 ms) exist in the same carrier.

In the present embodiment, the symbol lengths are the same among a plurality of carriers, but the present invention is not limited to this. The present embodiment can be suitably applied to a case where a user terminal performs communication using a plurality of carriers having different parameter sets. Here, the parameter set refers to communication parameters (e.g., at least one of subcarrier spacing, bandwidth, symbol length, CP length, TTI length, number of symbols per TTI, radio frame structure, filtering process, windowing process, etc.) in a frequency direction and/or a time direction.

In this embodiment, a user terminal includes: a reception unit that receives a DL shared channel (hereinafter, referred to as PDSCH, and also referred to as sPDSCH when it is distinguished from PDSCH of TTI of 1 ms); and a transmitting unit that transmits UCI including retransmission control information (hereinafter, referred to as a/N) of the PDSCH. Specifically, the user terminal controls transmission of UCI based on allocation of a UL shared channel (hereinafter referred to as sps) in one or more UL carriers having the same or different sTTI length as the DL carrier receiving the sps (modes 1 to 3). In addition, the UCI may include Channel State Information (CSI) and/or SR in addition to the a/N of the PDSCH.

In the present embodiment, the user terminal includes: a receiving unit that receives UL grant including transmission request information of CSI; and a transmitting unit that transmits UCI including CSI using PUSCH allocated by the UL grant. Specifically, the user terminal controls transmission of UCI in an UL TTI (hereinafter referred to as UL TTI) of an UL carrier corresponding to a TTI (hereinafter referred to as DL TTI) of a DL carrier receiving UL grant in a UL TTI after a predetermined period (mode 4). In addition, the UCI may include a/N and/or SR of the PDSCH in addition to CSI.

(mode 1)

In aspect 1, a user terminal sets a group (sTTI group) including one or more UL carriers having the same sTTI length and one or more DL carriers having the same and/or different sTTI length from the UL carrier, and controls UCI transmission for each sTTI group.

Fig. 2 is a diagram showing an example of the sTTI group according to embodiment 1. As shown in fig. 2, each sTTI group includes one or more UL carriers having the same sTTI length.

For example, in fig. 2, sTTI group 1 includes UL carriers 1 and 2 each having a sTTI length of 1 slot. The sTTI group 2 includes UL carriers 3 and 4 each having a sTTI length of 4 symbols. The sTTI group 3 includes UL carriers 5 and 6 each having an sTTI length of 2 symbols.

In fig. 2, only the UL carrier is shown, but each sTTI group may include DL carriers having the same sTTI length as the UL carrier and/or DL carriers having different sTTI lengths from the UL carrier.

The configuration information of each sTTI group is set by higher layer signaling (e.g., RRC signaling). The structure information may include at least one of an index, a time length, the number of symbols in the sTTI, and the like of the carrier included in each sTTI group. The configuration information may be set by at least one of higher layer signaling, system information, and physical layer signaling (L1/L2 control channel). When the duration of the sTTI group, the number of symbols in the sTTI, or the like is set by physical layer signaling, the duration of the sTTI, the number of symbols in the sTTI, or the like can be switched in a period shorter than the control of RRC signaling (for example, 1ms, 5ms, 10ms, or the like). In this case, the user terminal may assume that the duration or the number of symbols in the sTTI is the same in a certain time interval among a plurality of UL carriers included in each sTTI group.

Next, transmission control of UCI using the sTTI group set as described above will be described. The user terminal may determine an UL carrier for transmitting UCI within the same sTTI group as the DL carrier receiving PDSCH. Hereinafter, transmission control of UCI in the case where each sTTI group includes only UL carriers and DL carriers having the same sTTI length (case 1) and in the case where each sTTI group includes UL carriers and DL carriers having different sTTI lengths (cases 2 and 3) will be described.

< case 1>

In case 1, a case is described in which each sTTI group includes UL carriers having the same sTTI length and DL carriers having the same TTI length as the UL carriers.

In case 1, the user terminal transmits UCI including a/N of the sPDSCH in an sTTI (feedback sTTI) after receiving the sTTI of the sPDSCH for a predetermined period (for example, k sTTI). In the following, an example of UCI including a/N of PDSCH is described, but CSI and/or SR may be included in the UCI.

Fig. 3 is a diagram illustrating an example of transmission control of UCI according to case 1 of embodiment 1. For example, in fig. 3, sTTI group 1 includes UL carriers 1 and 2 having sTTI length of 1 slot and DL carrier 1. Further, sTTI group 2 includes UL carriers 3 and 4 having sTTI length of 2 symbols and DL carriers 2 and 3. That is, in each sTTI group of fig. 3, the sTTI lengths of the DL carrier and the UL carrier are the same.

In each sTTI group in fig. 3, when receiving the sPDSCH in stti#n, the user terminal transmits UCI including a/N of the sPDSCH using UL carriers in the same sTTI group in stti#n+k as feedback sTTI. Here, k is a value determined in consideration of the processing time of the user terminal, and is, for example, 4+.k+.8, but not limited thereto. In addition, k may be changed according to the time length.

In the sTTI #n+k, when no pusch is allocated to any UL carrier in the same sTTI group, the user terminal transmits UCI including the a/N using PUCCH (PUCCH allocated to a TTI of 1ms or PUCCH allocated to a sTTI (sPUCCH)).

In the stti#n+k, when the sps is allocated to a single UL carrier within the same sTTI group, the user terminal uses the sps to transmit UCI including the a/N.

In the stti#n+k, when the pusch is allocated to a plurality of UL carriers in the same sTTI group, the user terminal transmits UCI including the a/N using the pusch of the UL carrier having the smallest index number among the plurality of UL carriers.

For example, in stti#n+4 (where k=4) of sTTI group 1 of fig. 3, the spchs are allocated in both UL carriers 1 and 2. In this case, the user terminal transmits UCI including a/N of the sPDSCH received in the stti#n using the pusch of the UL carrier 1 having the small index number among the UL carriers 1 and 2 in the stti#n+4.

In the stti#n+4 (here, k=4) of the sTTI group 2 of fig. 3, only the pusch is allocated to the UL carrier 3. In this case, the user terminal uses the sps of carrier 3 in stti#n+4 to transmit UCI including a/N of the sps received in both DL carriers 2 and 3 in stti#n.

Similarly, in stti#n+10 of sTTI group 2 of fig. 3, only the pusch is allocated to UL carrier 4. In this case, the user terminal transmits UCI including a/N of the sPDSCH received in both DL carriers 2 and 3 in stti#n+6 using the sps pusch of carrier 4 in stti#n+10.

In the stti#n+15 of the sTTI group 2 of fig. 3, both UL carriers 3 and 4 are assigned the pusch. In this case, the user terminal transmits UCI including a/N of the sPDSCH received in both DL carriers 2 and 3 in the stti#n+11 using the sps of the carrier 3 having the small index number in the stti#n+15.

< case 2>

In case 2, a case is described in which each sTTI group includes UL carriers having the same sTTI length and DL carriers having TTI lengths different from those of the UL carriers. Hereinafter, a description will be given centering on the point different from the case 1.

In case 2, the user terminal transmits UCI including a/N of the sPDSCH in an sTTI (feedback sTTI) of the earliest UL carrier (ULsTTI) starting from an sTTI (DL sTTI) in which the sPDSCH is received for a predetermined period (for example, k DLsTTI) within the sTTI group.

Fig. 4 is a diagram illustrating an example of transmission control of UCI according to case 2 of embodiment 1. For example, in fig. 4, the sTTI group 1 includes UL carriers 1, 2, and 3 having sTTI length of 4 symbols, DL carrier 1 having sTTI length of 1 slot, and DL carriers 2 and 3 having sTTI length of 2 symbols. That is, in sTTI group 1 of fig. 4, there are no UL carriers with the same sTTI length as DL carriers 1-3.

As shown in fig. 4, when the UL sTTI length and the DL sTTI length in the sTTI group are different, there is not necessarily a UL sTTI starting at the same timing as the DL sTTI from which the stpdsch is received by the predetermined number of DL sTTI. Therefore, in fig. 4, when receiving the sPDSCH in the dlstti#n (where k=4), the user terminal transmits UCI including a/N of the sPDSCH using the earliest UL sTTI (feedback sTTI) starting after the DL stti#n+k in the same sTTI group.

In this feedback sTTI, when no pusch is allocated to any UL carrier in the same sTTI group, the user terminal transmits UCI including the a/N using PUCCH (PUCCH allocated to a TTI of 1ms or PUCCH (sPUCCH) allocated to a sTTI).

In this feedback sTTI, when a pusch is allocated in a single UL carrier within the same sTTI group, the user terminal uses the sps to transmit UCI including the a/N.

In this feedback sTTI, when the pusch is allocated to a plurality of UL carriers in the same sTTI group, the user terminal transmits UCI including the a/N using the pusch of the UL carrier having the smallest index number among the plurality of UL carriers.

For example, in fig. 4, since the user terminal receives the sPDSCH in the DL stti#n of DL carrier 1, UCI including a/N of the sPDSCH is transmitted in the earliest UL stti#n+8 after DL stti#n+4 (where k=4) of the DL carrier 1 in the same sTTI group 1. In UL stti#n+8 of fig. 4, a user terminal is allocated a pusch in both UL carriers 1 and 2. Therefore, in UL stti#n+8, the user terminal transmits UCI including the a/N using the pusch of UL carrier 1 having the smallest index number.

In fig. 4, since the user terminal receives the sPDSCH in DL stti#n of DL carriers 2 and 3, UCI including a/N of the sPDSCH is transmitted in the earliest UL stti#n+3 after DL stti#n+4 (where k=4) of the DL carriers 2 and 3 in the same sTTI group 1. In ULsTTI #n+3 of fig. 4, the user terminals are allocated pusch in UL carriers 1, 2, and 3. Therefore, in UL stti#n+3, the user terminal transmits UCI including the a/N using the pusch of UL carrier 1 having the smallest index number.

In fig. 4, since the sTTI lengths of DL carrier 1 are different from those of DL carriers 2 and 3, the transmission timing of a/N received in DL stti#n of DL carrier 1 and the transmission timing of a/N received in DL stti#n+10 of DL carriers 2 and 3 are the same. That is, the earliest UL sTTI after DL stti#n+4 of DL carrier 1 (where k=4) and the earliest UL sTTI after DL stti#n+10+4 of DL carriers 2 and 3 (where k=4) are the same UL stti#n+8.

Accordingly, in fig. 4, the user terminal transmits UCI including a/N of the sPDSCH received in DL stti#n of DL carrier 1 and a/N of the sPDSCH received in DL stti#n+10 of DL carriers 2 and 3 using the sps pusch of UL carrier 1 having the smallest index number allocated in UL stti#n+8.

< case 3>

In case 3, a case is described in which each sTTI group includes UL carriers having the same sTTI length and DL carriers having the same sTTI length as the UL carriers and different sTTI lengths. Hereinafter, the differences from cases 1 and 2 will be mainly described.

In case 3, when there is an UL carrier having the same sTTI length as the DL carrier on which the sPDSCH is received in the sTTI group, the user terminal transmits UCI including the a/N of the sPDSCH using UL sTTI (feedback sTTI) after a predetermined period (for example, k DL sTTI) from the DL sTTI on which the sPDSCH is received in the sTTI group.

On the other hand, when there is no UL carrier having the same sTTI length as the DL carrier on which the sPDSCH is received in the sTTI group, the user terminal transmits UCI including the a/N of the sPDSCH using the earliest UL sTTI (feedback sTTI) from a predetermined period (for example, k DL sTTI) after the DL sTTI on which the sPDSCH is received in the sTTI group.

In the feedback sTTI, when no pusch is allocated to any UL carrier in the same sTTI group, the user terminal transmits UCI including the a/N using PUCCH (PUCCH allocated to a TTI of 1ms or PUCCH (sPUCCH) allocated to a sTTI).

In the feedback sTTI, when a pusch is allocated in a single UL carrier within the same sTTI group, the user terminal uses the pusch to transmit UCI including the a/N.

In the feedback sTTI, when the pusch is allocated to a plurality of UL carriers in the same sTTI group, the user terminal transmits UCI including the a/N using the pusch of the UL carrier having the smallest index number among the plurality of UL carriers.

Fig. 5 is a diagram showing an example of transmission control of UCI according to case 3 of embodiment 1. For example, in fig. 5, sTTI group 1 includes UL carriers 1 and 2 having sTTI length of 1 slot, DL carrier 1 having sTTI length of 1 slot, and DL carriers 2 and 3 having sTTI length of 2 symbol. That is, in the sTTI group 1 of fig. 5, there is an UL carrier having the same sTTI length as DL carrier 1, but there is no UL carrier having the same sTTI length as DL carriers 2 and 3.

For example, in fig. 5, the user terminal receives the sPDSCH in DL stti#n of DL carrier 1. In this case, the user terminal transmits UCI including a/N of the sPDSCH in ULsTTI #n+4 of UL carrier 1 after 4 DL stttis from DL sttti #n of DL carrier 1. In UL stti#n+4 of fig. 5, since the user terminal is allocated with the pusch in both UL carriers 1 and 2, the user terminal transmits UCI including the a/N using the pusch of UL carrier 1 having the smallest index number.

In fig. 5, the user terminal receives the sPDSCH in DL stti#n of DL carriers 2 and 3. In this case, the user terminal transmits UCI including a/N of the sPDSCH in the earliest UL stti#n+2 after 4 DL sTTI from DL stti#n of DL carriers 2 and 3. In UL stti#n+2 of fig. 5, since a user terminal is allocated a pusch in UL carrier 2, the user terminal uses the pusch of UL carrier 2 to transmit UCI including the a/N described above.

In fig. 5, since the sTTI length of DL carrier 1 and the sTTI lengths of DL carriers 2 and 3 are different, the transmission timing of a/N received in DL stti#n of DL carrier 1 and the transmission timing of a/N received in DL stti#n+10 of DL carriers 2 and 3 are the same. That is, the earliest UL sTTI after DL stti#n+4 (where k=4) of DL carrier 1 and the earliest UL sTTI after DL stti#n+10+4 (where k=4) of DL carriers 2 and 3 are the same UL stti#n+4.

Therefore, in fig. 5, the user terminal transmits UCI including a/N of the sPDSCH received in DL stti#n of DL carrier 1 and a/N of the sPDSCH received in DL stti#n+10 of DL carriers 2 and 3 using the sps pusch of UL carrier 1 having the smallest index number allocated in UL stti#n+4.

At least one of the above cases 1 to 3 can be combined, and a different structure may be used for each sTTI group. For example, the sTTI group 1 may be configured to include DL carriers having different sTTI lengths from UL carriers as described in case 2 or 3, and the sTTI group 2 may be configured to include no DL carriers having different sTTI lengths from UL carriers (i.e., only UL carriers and DL carriers having the same sTTI length) as described in case 1.

As described above, in the 1 st aspect, the user terminal determines the UL carrier including UCI of the a/N in the same sTTI group as the DL carrier on which the sPDSCH is received. Since each sTTI group includes only UL carriers having the same sTTI length, the user terminal can easily determine the UL carrier to be used for transmitting UCI based on the PUSCH allocation in the UL carrier.

(mode 2)

In aspect 2, the user terminal does not set the sTTI group, but determines an UL carrier for transmitting UCI among one or more UL carriers to which the sps is allocated, based on the sTTI length (TTI length) of the one or more UL carriers. In the 2 nd aspect, the radio base station does not explicitly indicate the carrier for transmitting UCI, and the user terminal implicitly decides the carrier.

In aspect 2, when an UL carrier having the same sTTI length as the DL carrier on which the sPDSCH is received is set for the user terminal, the user terminal transmits UCI including the a/N of the sPDSCH using UL sTTI (feedback sTTI) after a predetermined period (for example, k DL sTTI) from the DL sTTI on which the sPDSCH is received.

On the other hand, when no UL carrier having the same sTTI length as the DL carrier on which the sPDSCH is received is set for the user terminal, the user terminal transmits UCI including the a/N of the sPDSCH using the earliest ULsTTI (feedback sTTI) from a predetermined period (for example, k DL stttis) after the DL sTTI on which the sPDSCH is received.

In the feedback sTTI, when no pusch is allocated to any UL carrier set for the user terminal, the user terminal transmits UCI including the a/N using PUCCH (PUCCH allocated to a TTI of 1ms or PUCCH (sPUCCH) allocated to a sTTI).

In the feedback sTTI, when a pusch is allocated in a single UL carrier, the user terminal uses the pusch to transmit UCI including the a/N.

In the feedback sTTI, when the pusch is allocated to a plurality of UL carriers having the same sTTI length, the user terminal transmits UCI including the a/N using the pusch of the UL carrier having the smallest index number among the plurality of UL carriers.

In the feedback sTTI, when a pusch is allocated to a plurality of UL carriers having different sTTI lengths, the user terminal determines to transmit an UL carrier including UCI of the a/N based on the sTTI lengths of the plurality of UL carriers.

For example, the user terminal may select the UL carrier with the shortest sTTI length, or may select the UL carrier with the longest sTTI length. In the case where there are multiple UL carriers with the shortest (or longest) sTTI length, the user terminal may also select the pusch of the UL carrier with the smallest index number among the multiple UL carriers.

Fig. 6 is a diagram illustrating an example of transmission control of UCI according to embodiment 2. For example, in fig. 6, DL carrier 1 and UL carrier 1 having an sTTI length of 1 slot, DL carriers 2 and 3 having an sTTI length of 2 symbols, UL carrier 3 and 4 having an sTTI length of 4 symbols, and UL carrier 2 are set for the user terminal.

For example, as shown in fig. 6, when the user terminal receives the sPDSCH in the DL stti#n of DL carriers 2 and 3, the feedback sTTI of UCI including a/N of the sPDSCH is the UL stti#n+4 of UL carriers 3 and 4 after the 4DL sTTI (where k=4) of the DL stti#n of DL carriers 2 and 3. Since the pusch is allocated to both UL carriers 3 and 4 in this UL stti#n+4, the user terminal transmits UCI including the a/N using the pusch of UL carrier 3 having a small index number.

As shown in fig. 6, when the user terminal receives the sPDSCH in DL stti#n+8 of DL carrier 3, the feedback sTTI including UCI of a/N of the sPDSCH is the earliest UL sTTI starting after DL stti#n+8+4 (where k=4) of the DL carrier 3, and is here UL stti#n+7 of UL carrier 2 and UL stti#n+12 of UL carriers 3 and 4. In fig. 6, since only the sps#n+7 of the UL carrier 2 is allocated with the sps pusch, the user terminal uses the sps pusch of the UL carrier 2 to transmit UCI including the a/N.

In fig. 6, feedback sTTI including UCI of a/N of the sPDSCH received by the user terminal in DL stti#n of DL carrier 1 is the same as feedback sTTI including UCI of a/N of the sPDSCH received in DL stti#n+10 of DL carrier 2, here UL stti#n+4 of UL carrier 1, stti#n+8 of UL carrier 2, and UL stti#n+14 of UL carriers 3 and 4. In fig. 6, all of them are assigned with the pusch, and the user terminal transmits UCI including the a/N using the pusch of UL carrier 3 having the smallest index number among UL carriers 3 and 4 having the shortest sTTI length.

Fig. 7 is a diagram illustrating another example of transmission control of UCI according to embodiment 2. Fig. 7 is the same as fig. 6 except that when the sps is allocated to a plurality of UL carriers having different sTTI lengths, the UL carrier having the longest sTTI length is selected instead of the UL carrier having the shortest sTTI length.

In fig. 7, as in fig. 6, the pusch is allocated to all of UL stti#n+4 of UL carrier 1, UL stti#n+8 of UL carrier 2, and UL stti#n+14 of UL carriers 3 and 4. In this case, the user terminal selects the pusch of UL carrier 1 having the longest sTTI length, and transmits UCI including a/N of the sPDSCH received in the stti#n of DL carrier 1 and a/N of the sPDSCH received in the stti#n+10 of DL carrier 2 using the pusch of UL carrier 1.

As described above, in the 2 nd aspect, the UL carrier on which UCI is transmitted is determined based on the sTTI length of one or more UL carriers to which the sps is allocated. Therefore, the user terminal can appropriately transmit UCI even if the sTTI group is not set. In addition, in the feedback sTTI, when the pusch is allocated among a plurality of UL carriers having different sTTI lengths, when UCI is fed back to the UL carrier having the shortest sTTI length, the delay time and/or processing time can be shortened, and the user experience speed can be improved. On the other hand, in case of feedback UCI in UL carrier with longest sTTI length, since the number or energy of radio resources available for UCI transmission can be increased, the reliability/quality of UCI feedback can be improved.

(mode 3)

In the 3 rd aspect, the user terminal does not set the sTTI group, but determines an UL carrier for transmitting UCI among one or more UL carriers to which the sps is allocated, based on the instruction information included in the UL grant. The 3 rd aspect will be described mainly with respect to the differences from the 2 nd aspect.

In the 3 rd aspect, when setting the UL carrier having the same sTTI length as the DL carrier on which the sPDSCH is received to the user terminal, the user terminal transmits UCI including the a/N of the sPDSCH using ULsTTI (feedback sTTI) after a predetermined period (for example, k DL sTTI) from the DL sTTI on which the sPDSCH is received.

On the other hand, when no UL carrier having the same sTTI length as the DL carrier on which the sPDSCH is received is set for the user terminal, the user terminal transmits UCI including the a/N of the sPDSCH using the earliest UL sTTI (feedback sTTI) from a predetermined period (for example, k DL sTTI) after the DL sTTI on which the sPDSCH is received.

The user terminal controls transmission of UCI including the a/N based on the indication information in the UL grant of the pusch to which the feedback sTTI is allocated. Here, the instruction information included in the UL grant may be 1 bit information (hereinafter referred to as example 1) indicating transmission or non-transmission, or may be 1 bit or more (for example, 3 bits) indicating an index of the UL carrier on which UCI is transmitted (hereinafter referred to as example 2).

< minimum timing of sPUSCH >

In the 3 rd aspect, when a plurality of carriers having the same or different sTTI length are used, how to specify the minimum timing of PUSCH scheduled by UL grant becomes a problem. Here, the minimum timing of the pusch is explained. The minimum timing of the pusch can be applied not only to the 3 rd aspect but also to the pusch allocated in the 1 st, 2 nd and 4 th aspects.

When the DL carrier that receives the UL grant and the sTTI length of the UL carrier that schedules the sps by the UL grant are the same, the minimum timing of the sps is the UL sTTI after a predetermined period (for example, k sTTI) from the DL sTTI that receives the UL grant.

On the other hand, when the DL carrier on which the UL grant is received and the sTTI length of the UL carrier on which the sps is scheduled by the UL grant are different, the minimum timing of the sps is the UL sTTI after a predetermined period (for example, k UL sTTI) from the UL TTI corresponding to the DL sTTI on which the UL grant is received.

Here, the UL sTTI corresponding to the DL sTTI in which the UL grant is received means, for example, a UL sTTI including the DL sTTI in a time-based manner. In addition, k is a value determined in consideration of the processing time of the user terminal, for example, 4+.k+.8, but is not limited thereto. In addition, k may be changed according to the time length.

Fig. 8 is a diagram showing an example of minimum timing of the pusch according to embodiment 3. For example, in fig. 8, DL carrier 1 and UL carrier 2 having an sTTI length of 1 slot, DL carrier 2 having an sTTI length of 2 symbols, and UL carrier 2 having an sTTI length of 4 symbols are set for the user terminal.

In fig. 8, UL grant for scheduling pusch of UL carrier 1 is set in advance in DL carrier 1, and UL grant for scheduling pusch of UL carrier 2 is set in DL carrier 2.

For example, in fig. 8, DL carrier 1 receiving the UL grant is the same sTTI length as UL carrier 1 scheduling the sps with the UL grant. Therefore, when the user terminal receives the UL grant in DL stti#n of DL carrier 1, the smallest timing of the pusch scheduled by the UL grant is UL stti#n+4 (here, k=4) after 4UL sTTI of DL stti#n.

On the other hand, in fig. 8, DL carrier 2 receiving the UL grant is different from the sTTI length of UL carrier 2 scheduling the sps with the UL grant. Therefore, when the user terminal receives the UL grant in the DL stti#n of DL carrier 2, the minimum timing of the pusch scheduled by the UL grant is UL stti#n+4 after 4UL sTTI from the UL stti#n of UL carrier 2 corresponding to the DL stti#n.

In fig. 8, when the user terminal receives the UL grant in DL stti#n+9 of DL carrier 2, the minimum timing of the pusch scheduled by the UL grant is UL stti#n+8 after 4UL sTTI from UL stti#n+4 of UL carrier 2 corresponding to the DL stti#n+9.

< referring to example 1>

In the instruction example 1, a case will be described in which the instruction information for feeding back the UL grant for transmission control of UCI in the sTTI is 1-bit information indicating transmission or non-transmission. For example, when the instruction information is "1", transmission is indicated, and when it is "0", non-transmission is indicated.

Specifically, in the feedback sTTI including UCI of a/N, when no sps is allocated to any UL carrier set for the user terminal, the user terminal transmits UCI including a/N using PUCCH (PUCCH allocated to TTI of 1ms or PUCCH (sPUCCH) allocated to sTTI).

In the feedback sTTI, when a pusch is allocated to a single UL carrier, the user terminal controls transmission of UCI including the a/N based on indication information in UL grant to which the pusch is allocated. For example, when the instruction information is "1", the user terminal transmits the UCI using the pusch, and when the instruction information is "0", the user terminal does not transmit the UCI using the pusch.

In the feedback sTTI, when a pusch is allocated to a plurality of UL carriers, transmission of UCI including the a/N is controlled based on indication information in a UL grant that is newly received from among a plurality of UL grants to which the pusch is allocated. For example, when there is only one latest UL grant with indication information of "1", the user terminal transmits the UCI using the pusch allocated by the UL grant. In addition, in case that there are a plurality of latest UL grants with indication information of "1", the user terminal transmits the UCI using the pusch with the smallest index number. Thus, since the UL carriers for transmitting UCI can be limited to 1, control of preferentially allocating transmission power to UL carriers containing UCI, etc. can be easily performed in cases such as insufficient transmission power.

Fig. 9 is a diagram showing an example of transmission control of UCI according to instruction example 1 of embodiment 3. For example, in fig. 9, DL carrier 1 and UL carrier 1 having an sTTI length of 1 slot, DL carriers 2, 3 and 4 having an sTTI length of 2 symbols, UL carrier 4, and UL carriers 2 and 3 having an sTTI length of 4 symbols are set for the user terminal.

In fig. 9, the pusch of each of UL carriers 1, 2, 3, and 4 is scheduled by UL grant of DL carriers 1, 2, 3, and 4.

For example, in fig. 9, DL carrier 1 and UL carrier 1 have the same sTTI length. Therefore, the pusch of UL stti#n+4 after 4sTTI from DL stti#n is allocated by UL grant of DL stti#n of DL carrier 1.

In fig. 9, DL carrier 4 and UL carrier 4 have the same sTTI length. Therefore, the pusch of UL stti#n+4 after 4sTTI is allocated by UL grant of DL stti#n of DL carrier 4. Similarly, the sPUSCH of the UL sTTI#n+14 after 4sTTI is allocated by the UL grant of the DL sTTI#n+10 of the DL carrier 4.

On the other hand, in fig. 9, DL carriers 2 and 3 are different from the sTTI lengths of UL carriers 2 and 3. Therefore, by UL grant of DL stti#n of DL carriers 2 and 3, the pusch of UL stti#n+4 after UL stti#n of 4UL sTTI from UL stti#n of UL carriers 2 and 3 corresponding to DL stti#n is allocated. Further, by UL grant of DL sttti#n+7 of DL carrier 2, pusch of ulstti#n+8 after 4UL sttti from UL sttti#n+4 of UL carrier 2 corresponding to DL sttti#n+7 is allocated. Further, by UL grant of DL stti#n+8 of DL carrier 3, pusch of UL stti#n+8 after 4UL sTTI from UL stti#n+4 of UL carrier 3 corresponding to DL stti#n+8 is allocated.

As shown in fig. 9, when the user terminal receives the sPDSCH in DL stti#n+3 of DL carrier 2, the feedback sTTI of UCI including a/N of the sPDSCH is UL stti#n+2 of UL carrier 1, UL stti#n+4 of UL carriers 2 and 3, and stti#n+7 of UL carrier 4 after 4DL sTTI (where k=4). At this timing, the pusch are allocated to UL carriers 2 and 3, and a plurality of the sfschs of UL carriers 2 and 3 are allocated by the latest UL grant. The indication information of UL grant for allocating the plurality of pusch is "1". Therefore, the user terminal transmits UCI including the a/N described above using the pusch of UL carrier 2 with a small index number.

As shown in fig. 9, when the user terminal receives the sPDSCH in DL stti#n+10 of DL carrier 2, the feedback sTTI of UCI including a/N of the sPDSCH is stti#n+4 of UL carrier 1, stti#n+8 of UL carriers 2 and 3, stti#n+14 of UL carrier 4 after 4DL sTTI (where k=4). At this timing, the pusch is allocated to all UL carriers 1 to 4, and the pusch of UL carrier 3 is allocated by the latest UL grant. The indication information of the latest UL grant is "1". Therefore, the user terminal transmits UCI including the a/N described above using the pusch of UL carrier 3.

In the case where there are a plurality of latest UL grants whose instruction information is "1", UCI may be copied and transmitted for all of the pusch allocated for these UL grants. Thus, UCI can be transmitted on a plurality of UL carriers, whereby diversity effect can be obtained and UCI reliability can be improved. For example, as shown in fig. 9, when the user terminal receives the sPDSCH in DL stti#n+3 of DL carrier 2, the feedback sTTI of UCI including a/N of the sPDSCH is UL stti#n+2 of UL carrier 1, UL stti#n+4 of UL carriers 2 and 3, and stti#n+7 of UL carrier 4 after 4DL sTTI (where k=4). At this timing, the pusch are allocated to UL carriers 2 and 3, and a plurality of the sfschs of UL carriers 2 and 3 are allocated by the latest UL grant. The indication information of UL grant for allocating the plurality of pusch is all "1". Therefore, the user terminal transmits UCI including the a/N described above using the pusch of UL carrier 2 and UL carrier 3.

< refer to example 2>

In the instruction example 2, a case will be described in which the instruction information for feeding back the UL grant for transmission control of UCI in the sTTI is information (for example, 3 bits) of 1 bit or more indicating the index of the UL carrier on which UCI is transmitted. For example, in the case where the indication information is 3 bits, each bit value may also represent an index number of the UL carrier.

Specifically, in the feedback sTTI including UCI of a/N, when no sps is allocated to any UL carrier set by the user terminal, the user terminal transmits UCI including the a/N using PUCCH (PUCCH allocated to TTI of 1ms or PUCCH (sPUCCH) allocated to sTTI).

In the feedback sTTI, when a pusch is allocated to a single UL carrier, the user terminal transmits the UCI using the pusch when the index number of the UL carrier is indicated by the indication information within the UL grant to which the pusch is allocated.

In the feedback sTTI, when a pusch is allocated to a plurality of UL carriers, transmission of UCI including the a/N is controlled based on indication information in a UL grant that is newly received from among a plurality of UL grants to which the pusch is allocated. For example, there is only one latest UL grant, and the UCI is transmitted using the pusch of the UL carrier indicated by the indication information in the UL grant.

When there are a plurality of latest UL grants whose indication information is the same value, the user terminal transmits the UCI using the pusch of the UL carrier indicated by the value. On the other hand, when there are a plurality of latest UL grants whose indication information is different in value, the user terminal transmits the UCI using the pusch having the smallest index number. Thus, since UL carriers for transmitting UCI can be limited to 1, control of preferentially allocating transmission power to UL carriers including UCI, etc. can be easily performed in cases such as insufficient transmission power.

Fig. 10 is a diagram showing an example of transmission control of UCI according to instruction example 2 of embodiment 3. For example, in fig. 10, DL carrier 0 and UL carrier 0 having an sTTI length of 1 slot, DL carriers 1 and 2 having an sTTI length of 2 symbols, UL carrier 4, and UL carriers 1 and 2 having an sTTI length of 4 symbols are set for the user terminal.

In fig. 10, the pusch of each of UL carriers 0, 1, 2, and 3 is scheduled by UL grant of DL carriers 0, 1, 2, and 3, respectively, is set in advance.

For example, in fig. 10, DL carrier 0 and UL carrier 0 have the same sTTI length. Therefore, the pusch of UL stti#n+4 after 4sTTI from DL stti#n is allocated by UL grant of DL stti#n of DL carrier 0.

In fig. 10, DL carrier 3 and UL carrier 3 have the same sTTI length. Therefore, the pusch of UL stti#n+4 after 4sTTI is allocated by UL grant of DL stti#n of DL carrier 3.

On the other hand, in fig. 10, DL carriers 1 and 2 and UL carriers 1 and 2 are different in sTTI length. Therefore, by UL grant of DL stti#n of DL carrier 1, the pusch of UL stti#n+4 after 4UL sTTI from UL stti#n of UL carrier 1 corresponding to DL stti#n is allocated. The sPUSCH of the UL sTTI#n+4 after the 4UL sTTI from the ULSTTI#n of the UL carrier 2 corresponding to the DL sTTI#n+1 is allocated by the UL grant of the DL sTTI#n+1 of the DL carrier 2. Similarly, the sPUSCH of the UL sTTI#n+7 is allocated by the UL grant of the DL sTTI#n+5 of the DL carriers 1 and 2. Further, the pusch of UL stti#n+8 is allocated by UL grant of DL stti#n+7 of DL carriers 1 and 2.

As shown in fig. 10, when the user terminal receives the sPDSCH in DL stti#n+3 of DL carrier 1, the feedback sTTI of UCI including a/N of the sPDSCH is UL stti#n+2 of UL carrier 0, UL stti#n+4 of UL carriers 1 and 2, and stti#n+7 of UL carrier 3 after 4DL sTTI (where k=4). At this timing, the sps is allocated to UL carriers 1 and 2, and the latest UL grant to which the sps is allocated is the UL grant of stti#n+1 of UL carrier 2. Therefore, the user terminal transmits UCI including the a/N using the pusch of UL carrier 2 of index number 2 indicated by the latest UL grant indication information "010".

As shown in fig. 10, when the user terminal receives the sPDSCH in DL stti#n+8 of DL carrier 1, feedback sTTI of UCI including a/N of the sPDSCH is UL stti#n+7 of UL carriers 1 and 2 and #n+12 of UL carrier 3 after 4DL sTTI (where k=4). At this timing, the pusch is allocated to UL carriers 1 and 2, and the latest UL grant to which the pusch is allocated is the UL grant of stti#n+5 of carriers 1 and 2. Since the UL grant for assigning the pusch of each of UL carriers 1 and 2 includes instruction information of different values "010" and "001", the user terminal transmits UCI including the a/N using the pusch of UL carrier 1 having a small index number.

As shown in fig. 10, when the user terminal receives the sPDSCH in DL stti#n+10 of DL carrier 1, the feedback sTTI of UCI including a/N of the sPDSCH is UL stti#4 of UL carrier 0 after 4DL sTTI (where k=4), UL stti#n+8 of UL carriers 1 and 2, and stti#n+14 of UL carrier 3. At this timing, the sps is allocated to UL carriers 0, 1, and 2, and the latest UL grant to which the sps is allocated is the UL grant of stti#n+7 of carriers 1 and 2. Since the UL grant for assigning the pusch of each of the UL carriers 1 and 2 includes the instruction information having the same value "001", the user terminal transmits UCI including the a/N using the pusch of the UL carrier 1 having the index number indicated by "001".

In addition, when there are a plurality of latest UL grants whose indication information is different in value, UCI may be copied and transmitted for all of the pusch allocated for these UL grants. Thus, UCI can be transmitted on a plurality of UL carriers, and thus diversity effect can be obtained and UCI reliability can be improved. For example, as shown in fig. 10, when the user terminal receives the sPDSCH in DL stti#n+8 of DL carrier 1, feedback sTTI of UCI including a/N of the sPDSCH is UL stti#n+7 of UL carriers 1 and 2 and #n+12 of UL carrier 3 after 4DL sTTI (where k=4). At this timing, the pusch is allocated to UL carriers 1 and 2, and the latest UL grant to which the pusch is allocated is the UL grant of stti#n+5 of carriers 1 and 2. Since the UL grants for assigning the pusch of UL carriers 1 and 2 include the indication information of the values "010" and "001" different from each other, the user terminal transmits UCI including the a/N using the pusch of UL carrier 1 and UL carrier 2.

As described above, in the 3 rd aspect, the UL carrier on which UCI is transmitted is determined based on the instruction information in the UL grant to which pusch is allocated. Therefore, even in the case where the sTTI group is not set, the user terminal can appropriately transmit UCI.

(mode 4)

In mode 4, transmission control of UCI including aperiodic CSI is described. The UCI may consist of CSI alone or may include a/N and/or SR in addition to CSI. The 4 th aspect can be combined with any one of the 1 st to 3 rd aspects, and description will be given centering on differences from the 1 st to 3 rd aspects.

In the 4 th aspect, the user terminal receives the UL grant including the transmission request information of the CSI. The user terminal controls transmission of CSI (hereinafter referred to as aperiodic CSI) using PUSCH allocated by the UL grant in a predetermined number of UL TTIs from a DL TTI corresponding to the DL TTI in which the UL grant is received (aspect 4).

When the DL carrier having received the UL grant and the UL carrier having scheduled the sps pusch by the UL grant have the same sTTI length, the minimum timing of the sps including the aperiodic CSI is the UL sTTI after a predetermined period (for example, k sTTI) from the DL sTTI having received the UL grant.

On the other hand, when the DL carrier on which the UL grant is received and the sTTI length of the UL carrier on which the pusch is scheduled by the UL grant are different, the minimum timing of the sps including the aperiodic CSI is the UL sTTI after a predetermined period (for example, k UL sTTI) from the UL sTTI corresponding to the DL sTTI on which the UL grant is received.

Here, the UL sTTI corresponding to the DL sTTI that received the UL grant refers to, for example, ULsTTI including the DL sTTI temporally. In addition, k is a value determined in consideration of the processing time of the user terminal, for example, 4+.k+.8, but is not limited thereto. In addition, k may be changed according to the time length.

The CSI transmission request information is information requesting transmission of Aperiodic CSI, and may be, for example, aperiodic CS trigger (a) -CS trigger, a value of CSI request field, or the like. The transmission of aperiodic CSI of no aperiodic CSI or which CSI process is requested is indicated by a CSI request field value within UL grant. In addition, the CSI process corresponds to DL carriers (cells, CCs).

The user terminal may determine the number X (0+.x+.m) of CSI processes for updating CSI information based on at least one of the capability of the user terminal and the timing (scheduling timing) of UL grant scheduling pusch including a transmission request of aperiodic CSI. Here, M represents the maximum number of CSI processes that the terminal can update at a time, and X represents the number of CSI processes that the terminal can update at a time under a prescribed condition.

For example, when the period of time from receiving the UL grant including the transmission request of the aperiodic CSI until the pusch scheduled by the UL grant is short, the updatable CSI process number X may be 0. Further, in the case where the period of time from receiving the UL grant including the transmission request of the aperiodic CSI until the pusch scheduled by the UL grant is sufficiently long, the CSI process number X may be equal to the maximum number M of CSI processes. Further, X satisfying 0< X < m may be determined based on a period of time from receiving the UL grant including the transmission request of the aperiodic CSI until the pusch scheduled by the UL grant. In the case where the value of X is smaller than the number of CSI processes requested by aperiodic CSI, an updated CSI process is decided from the CSI process with the smaller index number.

Fig. 11 is a diagram illustrating an example of transmission control of aperiodic CSI according to embodiment 4. For example, in fig. 11, DL carrier 1 and UL carrier 2 having an sTTI length of 1 slot, DL carrier 2 having an sTTI length of 2 symbols, and UL carrier 2 having an sTTI length of 4 symbols are set for the user terminal.

In fig. 11, UL grant for scheduling pusch of UL carrier 1 is set in advance in DL carrier 1, and UL grant for scheduling pusch of UL carrier 2 is set in DL carrier 2.

For example, in fig. 11, DL carrier 1 receiving the UL grant containing the CSI request field value "10" and UL carrier 1 scheduled for the pusch by the UL grant have the same sTTI length. In fig. 11, a CSI request field value "10" is set to request transmission of aperiodic CSI of CSI processes corresponding to DL carriers 1 and 2. Therefore, the user terminal transmits aperiodic CSI of CSI processes corresponding to DL carriers 1 and 2 in UL stti#n+4 after 4UL sTTI of DL stti#n of DL carrier 1.

On the other hand, in fig. 11, DL carrier 2 receiving the UL grant including CSI request field "01" and UL carrier 2 scheduled for the pusch by the UL grant are different in sTTI length. In fig. 11, a CSI request field value "01" is set to request transmission of aperiodic CSI of a CSI process corresponding to DL carrier 2. Therefore, the user terminal transmits aperiodic CSI of the CSI process corresponding to DL carrier 2 in UL stti#n+4 after 4UL sTTI from DL stti#n corresponding to DL carrier 2.

As described above, in the 4 th aspect, the user terminal can appropriately transmit the aperiodic CSI even in the case of using the UL carrier having the same and/or different sTTI length from the DL carrier.

(mode 5)

In aspect 5, signaling used in at least one of aspects 1 to 4 is described.

In the 5 th aspect, the user terminal may also signal information (sTTI length support information) on the sTTI length supported by the user terminal to the radio base station. Here, the sTTI length support information may also indicate at least one of an sTTI length supported by the user terminal and whether different TTI lengths are supported in DL and UL.

In the 5 th aspect, the radio base station may set information about the sTTI length (sTTI length setting information) for the user terminal. Here, the sTTI length setting information may indicate at least one of an sTTI length that the user terminal can use, whether different TTI lengths are supported in DL and UL, whether an sTTI group is set, and structure information of each sTTI group.

Fig. 12 is a diagram showing an example of signaling according to embodiment 5. In addition, at least one of higher layer signaling (e.g., RRC signaling), system information (e.g., MIB (master information block (Master Information Block)), SIB (system information block (System Information Block)), and L1/L2 control channels (e.g., PDCCH and/or EPDCCH) may be used for the signaling shown in fig. 12.

For example, in fig. 12A, as the sTTI support information, the user terminal notifies: (1) The sTTI length supported by the user terminal (here, 2 and 7 symbols in the DL carrier, 2, 3 or 4 symbols, 7 symbols in the UL carrier); (2) Different sTTI lengths are not supported in the DL carrier and UL carrier. Fig. 12B is different from fig. 12A in that notification (2) supports different sTTI lengths in DL and UL carriers.

In fig. 12C, the radio base station notifies the user terminal of the sTTI setting information: (1) The sTTI length specified for the user terminal (here, 2 and 7 symbols in the DL carrier, 2 and 7 symbols in the UL carrier); (2) an sTTI group including an sTTI group (mode 1). For example, in fig. 12C, the radio base station may set an sTTI group 1 including UL carriers and DL carriers having sTTI lengths of 2 symbols and an sTTI group 2 including UL carriers and DL carriers having sTTI lengths of 7 symbols (case 1 of embodiment 1).

In fig. 12D, the radio base station notifies, as sTTI setting information: (1) The sTTI length specified for the user terminal (here, 2 and 7 symbols in the DL carrier, 3 or 4 symbols, and 7 symbols in the UL carrier); (2) no sTTI group is set (mode 1); or (3) an sTTI group including sTTI groups having different sTTI lengths from UL carriers ( cases 1 and 2 of mode 1).

For example, in fig. 12D, the radio base station may set an sTTI group 1 (case 2 of aspect 1) composed of an UL carrier having an sTTI length of 2 symbols and a DL carrier having an sTTI length of 3 or 4 symbols, and an sTTI group 2 (case 1 of aspect 1) composed of an UL carrier having an sTTI length of 7 symbols and a DL carrier.

(Wireless communication System)

The configuration of the wireless communication system according to the present embodiment will be described below. In this wireless communication system, the wireless communication method according to each of the above embodiments is applied. The radio communication methods according to the above embodiments may be applied individually or in combination.

Fig. 13 is a diagram showing an example of a schematic configuration of the radio communication system according to the present embodiment. In the wireless communication system 1, carrier Aggregation (CA) and/or Dual Connection (DC) in which a plurality of basic frequency blocks (component carriers) in 1 unit of a system bandwidth (e.g., 20 MHz) of an LTE system are integrated can be applied. The radio communication system 1 may be referred to as SUPER 3G, LTE-A (LTE-Advanced), IMT-Advanced, 4G, 5G, FRA (future radio Access (Future Radio Access)), NR (New radio Access technology (New RAT: new Radio Access Technology)), or the like.

The radio communication system 1 shown in fig. 13 includes a radio base station 11 forming a macro cell C1, and radio base stations 12a to 12C arranged in the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. The macro cell C1 and each small cell C2 are provided with a user terminal 20. A configuration may be adopted in which different parameter sets are applied between cells and/or within cells.

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 using different frequencies simultaneously through CA or DC. Further, the user terminal 20 can apply CA or DC using a plurality of cells (CCs) (e.g., 2 or more CCs). Further, as a plurality of cells, the user terminal can utilize an authorized CC and an unauthorized CC.

In addition, the user terminal 20 can communicate using time division duplexing (TDD: time Division Duplex) or frequency division duplexing (FDD: frequency Division Duplex) in each cell. The TDD cell and the FDD cell may be referred to as a TDD carrier (frame structure type 2), an FDD carrier (frame structure type 1), or the like, respectively.

In addition, a single parameter set may be applied to each cell (carrier), or a plurality of different parameter sets may be applied.

Between the user terminal 20 and the radio base station 11, communication can be performed using a carrier with a narrow bandwidth (called an existing carrier, legacy carrier (Legacy carrier), or the like) in a relatively low frequency band (e.g., 2 GHz). On the other hand, between the user terminal 20 and the radio base station 12, a carrier having a wide bandwidth may be used in a relatively high frequency band (for example, 3.5GHz, 5GHz, 30 to 70GHz, etc.), and the same carrier as that between the radio base station 11 may be used. The configuration of the frequency band used by each radio base station is not limited to this.

A wired connection (for example, an optical fiber conforming to CPRI (common public radio interface (Common Public Radio Interface)), an X2 interface, or the like) or a wireless connection between the radio base station 11 and the radio base station 12 (or between 2 radio base stations 12) can be made.

The radio base station 11 and each radio base station 12 are connected to the upper station device 30, respectively, and are connected to the core network 40 via the upper station device 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 upper station device 30 via the radio base station 11.

The radio base station 11 is a radio base station having a relatively wide coverage area, and may be referred to as a macro base station, a sink node, an eNB (eNodeB), a transmission/reception point, or the like. The radio base station 12 is a radio base station having a local coverage area, and may be called a small-sized base station, a micro base station, a pico base station, a femto base station, a HeNB (home eNodeB (Home eNodeB)), an RRH (remote radio head (Remote Radio Head)), a transmission/reception point, or the like. Hereinafter, the radio base stations 11 and 12 are collectively referred to as a radio base station 10 without distinction.

Each user terminal 20 is a terminal supporting various communication schemes such as LTE and LTE-a, and may include not only a mobile communication terminal but also a fixed communication terminal. In addition, the user terminal 20 is capable of inter-terminal communication (D2D) with other user terminals 20.

In the wireless communication system 1, as a wireless access scheme, OFDMA (orthogonal frequency division multiple access) can be applied to a Downlink (DL), and SC-FDMA (single carrier-frequency division multiple access) can be applied to an Uplink (UL). OFDMA is a multi-carrier transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers), and data is mapped to each subcarrier to perform communication. SC-FDMA is a single carrier transmission scheme in which a system bandwidth is divided into a band consisting of one or consecutive resource blocks for each terminal, and a plurality of terminals use different bands, thereby reducing interference between terminals. The uplink and downlink radio access schemes are not limited to these combinations, and OFDMA may be used for UL.

In the radio communication system 1, DL shared channels (also referred to as physical downlink shared channels (PDSCH: physical Downlink Shared Channel), DL data channels, etc.), broadcast channels (physical broadcast channels (PBCH: physical Broadcast Channel)), L1/L2 control channels, etc., which are shared by the user terminals 20, are used as DL channels. User data or higher layer control information, SIBs (system information blocks (System Information Block)), etc., are transmitted through the PDSCH. In addition, MIB (master information block (Master Information Block)) is transmitted through PBCH.

The L1/L2 control channels include DL control channels (PDCCH (Physical downlink control channel (Physical Downlink Control Channel)), EPDCCH (enhanced Physical downlink control channel (Enhanced Physical Downlink Control Channel))), PCFICH (Physical control format indicator channel (Physical Control Format Indicator Channel)), PHICH (Physical Hybrid-ARQ Indicator Channel)), and the like. Downlink control information (DCI: downlink Control Information)) including scheduling information of PDSCH and PUSCH is transmitted through PDCCH, and the like. The number of OFDM symbols for the PDCCH is transmitted through the PCFICH. EPDCCH is frequency division multiplexed with PDSCH and is used for transmitting DCI or the like as in PDCCH. Retransmission indication information (ACK/NACK) for HARQ of PUSCH can be transmitted through at least one of PHICH, PDCCH, EPDCCH.

In the radio communication system 1, UL shared channels (also referred to as physical uplink shared channels (PUSCH: physical Uplink Shared Channel), UL data channels, and the like), UL control channels (physical uplink control channels (PUCCH: physical Uplink Control Channel)), random access channels (physical random access channels (PRACH: physical Random Access Channel)), and the like, which are shared by the user terminals 20, are used as UL channels. And transmitting the user data and the high-level control information through the PUSCH. Uplink control information (UCI: uplink Control Information)) including at least one of retransmission control information (a/N) of a DL signal, channel State Information (CSI), and the like is transmitted through the PUSCH or PUCCH. A random access preamble for establishing a connection with a cell is transmitted through the PRACH.

< radio base station >

Fig. 14 is a diagram showing an example of the overall configuration of the radio base station according to the present embodiment. The radio base station 10 includes a plurality of transmitting/receiving antennas 101, an amplifier unit 102, a transmitting/receiving unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. Further, each of the transmitting/receiving antenna 101, the amplifier unit 102, and the transmitting/receiving unit 103 may include one or more components.

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

The baseband signal processing section 104 performs processing of PDCP (packet data convergence protocol (Packet Data Convergence Protocol)) layer, segmentation and concatenation of user data, RLC (radio link control (Radio Link Control)) retransmission control and other RLC layer transmission processing, MAC (medium access control (Medium Access Control)) retransmission control (e.g., HARQ (hybrid automatic retransmission request (Hybrid Automatic Repeat reQuest)) transmission processing), scheduling, transport format selection, channel coding, inverse fast fourier transform (IFFT: inverse Fast Fourier Transform) processing, precoding processing and other transmission processing on the user data, and forwards the result to the transmission/reception section 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 transmitting/receiving section 103.

The transmitting/receiving section 103 converts the baseband signal output from the baseband signal processing section 104 by precoding for each antenna into a radio band and transmits the converted signal. The radio frequency signal frequency-converted in the transmitting/receiving unit 103 is amplified by the amplifier unit 102 and transmitted from the transmitting/receiving antenna 101.

The transmitter/receiver, the transmitting/receiving circuit, or the transmitting/receiving device described based on the common knowledge in the technical field of the present invention can be used. The transmitting/receiving unit 103 may be configured as an integral transmitting/receiving unit, or may be configured by a transmitting unit and a receiving unit.

On the other hand, regarding UL signals, radio frequency signals received in the transmitting/receiving antenna 101 are amplified in the amplifier unit 102. The transmitting/receiving section 103 receives the UL signal amplified in the amplifier section 102. The transmitting/receiving unit 103 frequency-converts the received signal into a baseband signal, and outputs the baseband signal to the baseband signal processing unit 104.

The baseband signal processing section 104 performs fast fourier transform (FFT: fast Fourier Transform) processing, inverse discrete fourier transform (IDFT: inverse Discrete Fourier Transform) processing, error correction decoding, reception processing for MAC retransmission control, reception processing for RLC layer and PDCP layer on UL data included in the input UL signal, and transfers the UL data to the upper station apparatus 30 via the transmission path interface 106. Call processing section 105 performs call processing such as setting or releasing of a communication channel, state management of radio base station 10, or management of radio resources.

The transmission path interface 106 transmits and receives signals to and from the upper station device 30 via a predetermined interface. The transmission path interface 106 may transmit and receive signals (backhaul signaling) to and from the adjacent radio base station 10 via an inter-base station interface (e.g., an optical fiber according to CPRI (common public radio interface (Common Public Radio Interface)), an X2 interface).

Further, transmitting/receiving section 103 transmits DL signals (including at least one of DL data signals, DL control signals, and DL reference signals) to a plurality of user terminals 20 having different parameter sets, and receives UL signals (including at least one of UL data signals, UL control signals, and UL reference signals) from the plurality of user terminals 20.

Further, transmitting/receiving section 103 receives UCI from user terminal 20 using a UL shared channel (e.g., PUSCH) or a UL control channel (e.g., PUCCH). The UCI includes at least one of a/N, CSI, and SR of a DL shared channel (e.g., PDSCH, sPDSCH for sTTI).

Note that transmission/reception section 103 may receive sTTI support information from user terminal 20 (aspect 5). Note that transmission/reception section 103 may transmit sTTI setting information to user terminal 20 (aspect 5).

Fig. 15 is a diagram showing an example of the functional configuration of the radio base station according to the present embodiment. In fig. 15, the functional blocks of the characteristic part in the present embodiment are mainly shown, and the radio base station 10 is provided with other functional blocks necessary for radio communication. As shown in fig. 15, the baseband signal processing unit 104 includes a control unit 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305.

The control unit 301 controls the entire radio base station 10. The control unit 301 controls, for example, generation of a DL signal by the transmission signal generation unit 302 or mapping of a DL signal by the mapping unit 303, reception processing (e.g., demodulation, etc.) of an UL signal by the reception signal processing unit 304, or measurement by the measurement unit 305.

Specifically, the control unit 301 performs scheduling of the user terminal 20. For example, control section 301 may schedule a plurality of carriers (DL carriers and/or UL carriers) having different sTTI lengths. Furthermore, the control unit 301 may also perform scheduling of carriers (DL carriers and/or UL carriers) of TTI length of 1 ms.

Furthermore, the control unit 301 may set a plurality of carriers (DL carrier and/or UL carrier) having the same or different sTTI length to the user terminal 20. The plurality of carriers may be set using at least one of higher layer signaling, system information, and L1/L2 control channels.

The control unit 301 may determine an sTTI (feedback sTTI) for receiving UCI including an a/N of the DL shared channel. Specifically, when the DL carrier transmitting the DL shared channel and the sTTI length of the UL carrier receiving the UL shared channel are the same, control section 301 may determine, as feedback sTTI, an UL sTTI after a predetermined period from the DL sTTI transmitting the DL shared channel (aspects 1 to 3).

When the sTTI lengths of the DL carrier transmitting the DL shared channel and the UL carrier receiving the UL shared channel are different, control section 301 may determine, as feedback sTTI (1 st to 3 rd modes), the UL sTTI (2 nd TTI) of the earliest UL carrier after a predetermined period from the DL sTTI (1 st TTI) transmitting the DL shared channel.

Furthermore, control section 301 may control reception of UCI including an a/N of a DL shared channel based on allocation of the UL shared channel in one or more UL carriers having the same or different sTTI length as the DL carrier receiving the DL shared channel. Specifically, control section 301 may control the reception of UCI including the a/N based on the allocation of the UL shared channel in the feedback sTTI.

For example, control section 301 may set an sTTI group including one or more UL carriers having the same sTTI length and one or more DL carriers which are the same as and/or different from the UL carriers, and determine an UL carrier for receiving UCI including the a/N within the same group as the DL carrier transmitting the DL shared channel (aspect 1).

Control section 301 may determine an UL carrier for receiving UCI including the a/N based on the sTTI length of one or more UL carriers to which the UL shared channel is allocated (aspect 2). Furthermore, control section 301 may determine an UL carrier for receiving UCI including the a/N based on the instruction information included in the UL grant for allocating the UL shared channel (aspect 3).

In addition, when the DL carrier transmitting the UL grant and the sTTI length of the UL carrier to which the UL shared channel is allocated by the UL grant are the same, control section 301 may determine the UL sTTI after a predetermined period from the DL sTTI transmitting the UL grant as the sTTI for receiving the UL shared channel (aspects 1 to 4).

When the sTTI lengths of the DL carrier transmitting the UL grant and the UL carrier to which the UL shared channel is allocated by the UL grant are different, control section 301 may determine, as sTTI (1 st to 4 th modes) for receiving the UL shared channel, an UL sTTI (5 th TTI) after a predetermined period from a DL sTTI (4 th sTTI) corresponding to the DL sTTI (3 rd TTI) transmitting the UL grant.

The control unit 301 may perform retransmission control of the DL shared channel (e.g., PDSCH) based on the a/N from the user terminal 20.

Furthermore, the control unit 301 may also control aperiodic CSI reporting. Specifically, control section 301 determines a CSI request field value and controls to generate and transmit an UL grant including the CSI request field value.

In addition, when the DL carrier transmitting the UL grant including the CSI request field value and the sTTI length of the UL carrier to which the UL shared channel is allocated by the UL grant are the same, control section 301 may determine the UL sTTI after a predetermined period from the DL sTTI transmitting the UL grant as the sTTI for receiving the aperiodic CSI (aspect 4).

In addition, when the DL carrier receiving the UL grant including the CSI request field value and the sTTI length of the UL carrier to which the UL shared channel is allocated by the UL grant are different, control section 301 may determine, as the sTTI for receiving the aperiodic CSI, an UL sTTI that is a predetermined period after an UL sTTI corresponding to the DL sTTI to which the UL grant is transmitted (aspect 4).

The control unit 301 can be constituted by a controller, a control circuit, or a control device described based on common knowledge in the technical field of the present invention.

Transmission signal generation section 302 generates a DL signal (including DL data, scheduling information, and sTTI setting information) based on an instruction from control section 301, and outputs the generated DL signal to mapping section 303.

The transmission signal generation unit 302 can be configured as a signal generator, a signal generation circuit, or a signal generation device described based on common knowledge in the technical field of the present invention.

Mapping section 303 maps the DL signal generated in transmission signal generating section 302 to a predetermined radio resource based on an instruction from control section 301, and outputs the mapped DL signal to transmitting/receiving section 103. The mapping unit 303 can be configured as a mapper, a mapping circuit, or a mapping device described based on common knowledge in the technical field of the present invention.

The received signal processing unit 304 performs reception processing (e.g., demapping, demodulation, decoding, etc.) on UL signals (e.g., UL data signals, UL control signals, UCI, sTTI support information, etc.) transmitted from the user terminal 20. Specifically, received signal processing section 304 performs UL signal reception processing based on the parameter set for user terminal 20. The received signal processing unit 304 may output the received signal or the signal after the reception process to the measurement unit 305. Further, the reception signal processing unit 304 performs reception processing on the a/N of the DL signal, and outputs ACK or NACK to the control unit 301.

The measurement unit 305 performs measurements related to the received signals. The measurement unit 305 can be constituted by a measuring instrument, a measurement circuit, or a measurement device described based on common knowledge in the technical field of the present invention.

The measurement unit 305 may measure the channel quality of the UL, for example, based on the received power (e.g., RSRP (reference signal received power (Reference Signal Received Power)) and/or the received quality (e.g., RSRQ (reference signal received quality (Reference Signal Received Quality))) of the UL reference signal. The measurement result may be output to the control unit 301.

< user terminal >

Fig. 16 is a diagram showing an example of the overall configuration of the user terminal according to the present embodiment. The user terminal 20 includes a plurality of transmit/receive antennas 201 for MIMO transmission, an amplifier unit 202, a transmit/receive unit 203, a baseband signal processing unit 204, and an application unit 205.

Radio frequency signals received through the plurality of transmitting and receiving antennas 201 are amplified in the amplifier unit 202, respectively. Each transmitting/receiving section 203 receives the DL signal amplified by the amplifier section 202. The transmitting/receiving section 203 frequency-converts the received signal into a baseband signal and outputs the baseband signal to the baseband signal processing section 204.

The baseband signal processing section 204 performs FFT processing, error correction decoding, reception processing for retransmission control, and the like on the input baseband signal. The DL data is forwarded to the application unit 205. The application unit 205 performs processing related to a layer higher than the physical layer or the MAC layer, and the like. In addition, the broadcast information is also forwarded to the application unit 205.

On the other hand, UL data is input from the application unit 205 to the baseband signal processing unit 204. The baseband signal processing section 204 performs transmission processing (for example, HARQ transmission processing) for retransmission control, channel coding, rate matching, puncturing, discrete fourier transform (DFT: discrete Fourier Transform) processing, IFFT processing, and the like, and transfers the result to each of the transmission/reception sections 203. UCI (e.g., retransmission control information of DL, channel state information, etc.) is also subjected to channel coding, rate matching, puncturing, DFT processing, IFFT processing, etc., and is forwarded to each transmitting/receiving section 203.

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

The transmitting/receiving section 203 receives DL signals (including DL data signals, DL control signals, and DL reference signals) of the parameter set for the user terminal 20, and transmits UL signals (including UL data signals, UL control signals, and UL reference signals) of the parameter set.

Further, transmitting/receiving section 203 transmits UCI to radio base station 10 using a UL shared channel (e.g., PUSCH) or a UL control channel (e.g., PUCCH). The UCI includes at least one of a/N, CSI, and SR of a DL shared channel (e.g., PDSCH, sPDSCH for sTTI).

Note that transmission/reception section 203 may transmit sTTI support information to radio base station 10 (aspect 5). Note that, the transmission/reception section 203 may receive sTTI setting information from the radio base station 10 (aspect 5).

The transmitting/receiving unit 203 can be configured as a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device described based on common knowledge in the technical field of the present invention. The transmitting/receiving unit 203 may be configured as an integral transmitting/receiving unit, or may be configured by a transmitting unit and a receiving unit.

Fig. 17 is a diagram showing an example of a functional configuration of a user terminal according to the present embodiment. In fig. 17, the functional blocks of the characteristic part in the present embodiment are mainly shown, and the user terminal 20 is provided with other functional blocks necessary for wireless communication. As shown in fig. 17, the baseband signal processing unit 204 included in the user terminal 20 includes a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405.

The control unit 401 performs control of the entire user terminal 20. The control section 401 controls, for example, generation of an UL signal by the transmission signal generation section 402, mapping of an UL signal by the mapping section 403, reception processing of a DL signal by the reception signal processing section 404, and measurement by the measurement section 405.

Furthermore, the control unit 401 may set a plurality of carriers (DL carrier and/or UL carrier) having the same or different sTTI length for the user terminal 20. The plurality of carriers may be set using at least one of higher layer signaling (e.g., RRC signaling), system information, and L1/L2 control channels from the radio base station 10.

The control unit 401 may determine an sTTI (feedback sTTI) for transmitting UCI including an a/N of the DL shared channel. Specifically, when the DL carrier receiving the DL shared channel and the sTTI length of the UL carrier transmitting the UL shared channel are the same, control section 401 may determine the UL sTTI after a predetermined period from the DL sTTI receiving the DL shared channel as the feedback sTTI (aspects 1 to 3).

When the sTTI lengths of the DL carrier receiving the DL shared channel and the UL carrier transmitting the UL shared channel are different, control section 401 may determine, as feedback sTTI (1 st to 3 rd modes), the UL sTTI (2 nd TTI) of the earliest UL carrier after a predetermined period from the DL sTTI (1 st TTI) receiving the DL shared channel.

The control unit 401 may control transmission of UCI including an a/N of a DL shared channel based on allocation of the UL shared channel in one or more UL carriers having the same or different sTTI length from the DL carrier receiving the DL shared channel. Specifically, control section 401 may control transmission of UCI including the a/N based on allocation of the UL shared channel in the feedback sTTI.

For example, control section 401 may set an sTTI group including one or more UL carriers having the same sTTI length and one or more DL carriers identical to and/or different from the UL carriers, and determine to transmit an UL carrier including UCI of the a/N within the same group as the DL carrier receiving the DL shared channel (aspect 1).

The control unit 401 may determine an UL carrier for transmitting UCI including the a/N based on the sTTI length of one or more UL carriers to which the UL shared channel is allocated (aspect 2). Furthermore, control section 401 may determine an UL carrier for transmitting UCI including the a/N based on the instruction information included in the UL grant for allocating the UL shared channel (aspect 3).

In addition, when the DL carrier receiving the UL grant and the sTTI length of the UL carrier to which the UL shared channel is allocated by the UL grant are the same, control section 401 may determine the UL sTTI after a predetermined period from the DL sTTI receiving the UL grant as the sTTI for transmitting the UL shared channel (aspects 1 to 4).

When the sTTI lengths of the DL carrier receiving the UL grant and the UL carrier allocating the UL shared channel by the UL grant are different, control section 401 may determine, as sTTI (1 st to 4 th modes) for transmitting the UL shared channel, an UL sTTI (5 th TTI) after a predetermined period from an UL sTTI (4 th sTTI) corresponding to the DL sTTI (3 rd TTI) receiving the UL grant.

Furthermore, the control unit 401 may also control aperiodic CSI reporting. Specifically, when receiving the UL grant including the CSI request field value, control section 401 controls to generate and transmit UCI including aperiodic CSI based on the CSI request field value.

For example, when the DL carrier receiving the UL grant including the CSI request field value and the sTTI length of the UL carrier to which the UL shared channel is allocated by the UL grant are the same, control section 401 may determine the UL sTTI after a predetermined period from the DL sTTI in which the UL grant is received as the sTTI for transmitting the aperiodic CSI (aspect 4).

In addition, when the DL carrier receiving the UL grant including the CSI request field value and the sTTI length of the UL carrier to which the UL shared channel is allocated by the UL grant are different, control section 301 may determine, as an sTTI for transmitting the aperiodic CSI, an UL sTTI that is a predetermined period after an UL sTTI corresponding to the DL sTTI to which the UL grant is received (mode 4).

The control unit 401 can be constituted by a controller, a control circuit, or a control device described based on common knowledge in the technical field of the present invention.

Transmission signal generation section 402 generates (e.g., encodes, rate-matches, punctures, modulates, etc.) an UL signal (including UL data signal, UL control signal, UL reference signal, UCI, sTTI support information) based on an instruction from control section 401, and outputs the generated UL signal to mapping section 403. The transmission signal generation unit 402 can be configured as a signal generator, a signal generation circuit, or a signal generation device described based on common knowledge in the technical field of the present invention.

Mapping section 403 maps the UL signal generated in transmission signal generating section 402 to radio resources based on an instruction from control section 401, and outputs the mapped UL signal to transmitting/receiving section 203. The mapping unit 403 can be configured as a mapper, a mapping circuit, or a mapping device described based on common knowledge in the technical field of the present invention.

The reception signal processing unit 404 performs reception processing (e.g., demapping, demodulation, decoding, etc.) on DL signals (DL data signals, scheduling information, DL control signals, DL reference signals, sTTI setting information). The reception signal processing unit 404 outputs information received from the wireless base station 10 to the control unit 401. The reception signal processing unit 404 outputs, for example, broadcast information, system information, higher layer control information based on higher layer signaling such as RRC signaling, physical layer control information (L1/L2 control information), and the like to the control unit 401.

The reception signal processing unit 404 can be constituted by a signal processor, a signal processing circuit, or a signal processing device described based on common knowledge in the technical field of the present invention. The reception signal processing unit 404 can constitute a reception unit according to the present invention.

Measurement section 405 measures a channel state based on a reference signal (e.g., CSI-RS) from radio base station 10, and outputs the measurement result to control section 401. The channel state may be measured for each CC.

The measurement unit 405 can be configured of a signal processor, a signal processing circuit, or a signal processing device, and a measuring device, a measurement circuit, or a measurement device, which are described based on common knowledge in the technical field of the present invention.

< hardware Structure >

The block diagrams used in the description of the above embodiments represent blocks of functional units. These functional blocks (structural units) are implemented by any combination of hardware and/or software. The implementation means of each functional block is not particularly limited. That is, each functional block may be realized by 1 device physically and/or logically combined, or may be realized by a plurality of devices by directly and/or indirectly (for example, wired and/or wireless) connecting 2 or more devices physically and/or logically separated.

For example, the radio base station, the user terminal, and the like in the present embodiment can function as a computer that performs the processing of the radio communication method of the present invention. Fig. 18 is a diagram showing an example of a hardware configuration of a radio base station and a user terminal according to the present embodiment. The radio base station 10 and the user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In the following description, the term "device" may be replaced with a circuit, a device, a unit, or the like. The hardware configuration of the radio base station 10 and the user terminal 20 may be configured to include one or a plurality of devices shown in the figure, or may be configured to not include a part of the devices.

For example, the processor 1001 illustrates only one, but there may be multiple processors. Further, the processing may be performed by 1 processor, or the processing may be performed by 1 or more processors simultaneously, sequentially, or in other ways. The processor 1001 may be implemented by 1 or more chips.

The functions of the radio base station 10 and the user terminal 20 are realized by, for example, reading predetermined software (program) into hardware such as a processor 1001 and a memory 1002, performing operations by the processor 1001, and controlling communication by the communication device 1004 and reading and/or writing data in the memory 1002 and the storage 1003.

The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may be constituted by a central processing unit (CPU: central Processing Unit)) 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), the call processing unit 105, and the like described above may be implemented in the processor 1001.

Further, the processor 1001 reads a program (program code), a software module, data, or the like from the storage 1003 and/or the communication device 1004 to the memory 1002, and executes various processes based thereon. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiment mode is used. For example, the control unit 401 of the user terminal 20 may be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same may be implemented with respect to other functional blocks.

The Memory 1002 is a computer-readable recording medium, and may be constituted by at least one of ROM (Read Only Memory), EPROM (erasable programmable Memory ROM (Erasable Programmable ROM)), EEPROM (electrical EPROM (Electrically EPROM)), RAM (random access Memory (Random Access Memory)), and other suitable storage media, for example. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage), or the like. The memory 1002 can store programs (program codes), software modules, and the like executable to implement a wireless communication method according to an embodiment of the present invention.

The storage 1003 is a computer-readable recording medium, and may be constituted of at least one of a flexible disk, a soft (registered trademark) disk, an magneto-optical disk (e.g., compact disk (CD-ROM (Compact Disc ROM), etc.), a digital versatile disk, a Blu-ray (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., card, stick, key drive), a magnetic stripe, a database, a server, and other suitable storage medium, for example. The storage 1003 may also be referred to as secondary storage.

The communication device 1004 is hardware (transmitting/receiving device) for performing communication between computers via a wired and/or wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like, for example. The communication device 1004 may be configured to implement frequency division duplexing (FDD: frequency Division Duplex) and/or time division duplexing (TDD: time Division Duplex), for example, and may include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like. 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 implemented in the communication device 1004.

The input device 1005 is an input apparatus (for example, a keyboard, a mouse, a microphone, a switch, a key, a sensor, or the like) that receives an input from the outside. The output device 1006 is an output apparatus (for example, a display, a speaker, an LED (light emitting diode (Light Emitting Diode)) lamp, or the like) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

The processor 1001 and the memory 1002 are connected by a bus 1007 for information communication. The bus 1007 may be formed of one bus or may be formed of a bus different between devices.

The radio base station 10 and the user terminal 20 may be configured by hardware such as a microprocessor, a digital signal processor (DSP: digital Signal Processor), an ASIC (application specific integrated circuit (Application Specific Integrated Circuit)), a PLD (programmable logic device (Programmable Logic Device)), and an FPGA (field programmable gate array (Field Programmable Gate Array)), or some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.

(modification)

In addition, the words described in the specification and/or words required for understanding the specification may be replaced with words having the same or similar meaning. For example, the channel and/or symbol may also be a signal (signaling). In addition, the signal may also be a message. The Reference Signal can also be simply referred to as RS (Reference Signal), and may also be referred to as Pilot (Pilot), pilot Signal, or the like according to the applied standard. In addition, the component carrier (CC: component Carrier) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

In addition, a radio frame may be formed of one or more periods (frames) in the time domain. The one or more respective periods (frames) constituting the radio frame may also be referred to as subframes. Further, a subframe may also be composed of one or more slots in the time domain. Further, the slot may also be formed of one or more symbols in the time domain (OFDM (orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing)) symbols, SC-FDMA (single carrier frequency division multiple access (Single Carrier Frequency Division Multiple Access)) symbols, etc.

The radio frames, subframes, slots, and symbols all represent units of time when a signal is transmitted. Other designations of radio frames, subframes, slots, and symbols corresponding to each may also be used. For example, 1 subframe may also be referred to as a transmission time interval (TTI: transmission Time Interval), a plurality of consecutive subframes may also be referred to as TTIs, and 1 slot may also be referred to as a TTI. That is, the subframe or TTI may be a subframe (1 ms) in the conventional LTE, may be a period (e.g., 1-13 symbols) shorter than 1ms, or may be a period longer than 1 ms.

Here, TTI refers to, for example, a scheduled minimum time unit in wireless communication. For example, in the LTE system, a radio base station performs scheduling for each user terminal to allocate radio resources (frequency bandwidth, transmission power, and the like that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited thereto. The TTI may be a transmission time unit of a channel-coded data packet (transport block), or may be a processing unit such as scheduling or link adaptation.

A TTI having a duration of 1ms may also be referred to as a normal TTI (TTI in LTE rel.8-12), a normal TTI, a long (long) TTI, a normal subframe, a long (long) subframe, or the like. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short (short) TTI, a shortened subframe, or a short (short) subframe.

A Resource Block (RB) is a Resource allocation unit of a time domain and a frequency domain, and may include one or a plurality of consecutive subcarriers (subcarriers) in the frequency domain. Further, the RB may contain one or more symbols in the time domain, and may be 1 slot, 1 subframe, or 1TTI in length. The 1TTI and the 1 subframe may each be formed by one or more resource blocks. The RBs may be referred to as Physical Resource Blocks (PRBs), PRB pairs, or RBs.

Furthermore, a Resource block may also be composed of one or more Resource Elements (REs). For example, 1RE may be a radio resource region of 1 subcarrier and 1 symbol.

The structure of the radio frame, the subframe, the slot, the symbol, and the like is merely an example. For example, the number of subframes included in a radio frame, the number of slots included in a subframe, the number of symbols and RBs included in a slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and the like can be variously changed.

The information, parameters, and the like described in the present specification may be represented by absolute values, relative values to predetermined values, or other corresponding information. For example, the radio resource may be indicated by a predetermined index. Further, the expression or the like using these parameters may be different from those explicitly disclosed in the present specification.

The names used for parameters and the like in the present specification are not limited in any way. For example, various channels (PUCCH (physical uplink control channel (Physical Uplink Control Channel)), PDCCH (physical downlink control channel (Physical Downlink Control Channel)), and the like) and information elements can be identified by all appropriate names, and therefore, the various names assigned to these various channels and information elements do not have a limiting meaning at any point.

Information, signals, etc. described in this specification may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

Further, information, signals, etc. may be output from an upper layer to a lower layer and/or from a lower layer to an upper layer. Information, signals, etc. may also be input and output via a plurality of network nodes.

The input/output information, signals, and the like may be stored in a specific area (for example, a memory) or may be managed by a management table. Information, signals, etc. input and output may be rewritten, updated, or added. The outputted information, signals, etc. may also be deleted. The input information, signals, etc. may also be transmitted to other devices.

The information notification is not limited to the embodiment described in the present specification, and may be performed by other methods. For example, the notification of the information may be implemented by physical layer signaling (e.g., downlink control information (DCI: downlink Control Information)), uplink control information (UCI: uplink Control Information)), higher layer signaling (e.g., RRC (radio resource control (Radio Resource Control)) signaling, broadcast information (master information block (MIB: master Information Block), system information block (SIB: system Information Block), etc.), MAC (medium access control (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. In addition, the RRC signaling may also be referred to as an RRC message, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like. The MAC signaling may be notified by a MAC Control Element (MAC CE), for example.

Note that the notification of the predetermined information (for example, the notification of "X") is not limited to being explicitly performed, and may be performed implicitly (for example, by not performing the notification of the predetermined information or by performing the notification of other information).

The determination may be performed by a value (0 or 1) represented by 1 bit, a true value (Boolean) represented by true (true) or false (false), or a comparison of values (e.g., a comparison with a predetermined value).

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, should be broadly interpreted to mean instructions, instruction sets, code segments, program code, programs, subroutines, software modules, applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

Further, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, where software is transmitted from a website, server, or other remote source using wired (coaxial, fiber optic, twisted pair, and digital subscriber line (DSL: digital Subscriber Line), etc.) and/or wireless technologies (infrared, microwave, etc.), the wired and/or wireless technologies are included in the definition of transmission medium.

The terms "system" and "network" as used in this specification may be used interchangeably.

In the present specification, the terms "Base Station", "radio Base Station", "eNB", "cell", "sector", "cell group", "carrier", and "component carrier" are used interchangeably. The base station may be called a fixed station (eNB), a NodeB, an eNodeB (eNodeB), an access point (access point), a transmission point, a reception point, a femto cell, a small cell, or the like.

A base station can accommodate 1 or more (e.g., 3) cells (also referred to as sectors). In the case of a base station accommodating a plurality of cells, the coverage area of the base station can be divided into a plurality of smaller areas, and each of the smaller areas can also provide communication services through a base station subsystem (e.g., a small base station for indoor use (remote radio head (RRH: remote Radio Head)), the terms "cell" or "sector" refer to a part or all of the coverage area of the base station and/or base station subsystem in which communication services are performed in the coverage area.

In the present specification, words such as "Mobile Station", "User terminal", "User Equipment", and "terminal" are used interchangeably. The base station may be called a fixed station (eNB), a NodeB, an eNodeB (eNodeB), an access point (access point), a transmission point, a reception point, a femto cell, a small cell, or the like.

Mobile stations are sometimes referred to by those skilled in the art as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals, handsets, user agents, mobile clients, or some other suitable word.

In addition, the radio base station in the present specification may be replaced with a user terminal. For example, the embodiments of the present invention can be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (Device-to-Device (D2D)). In this case, the user terminal 20 may have the function of the radio base station 10. The terms "upstream" and "downstream" may be used interchangeably. For example, the uplink channel may be replaced with a side channel.

Similarly, the user terminal in the present specification may be replaced with a radio base station. In this case, the radio base station 10 may have the function of the user terminal 20.

In the present specification, a specific operation performed by a base station may be performed by an upper node (upper node) thereof, as the case may be. In a network composed of one or more network nodes (network nodes) having a base station, it is apparent that various operations performed for communication with a terminal may be performed by the base station, 1 or more network nodes other than the base station (for example, considering MME (mobility management entity (Mobility Management Entity)), S-GW (Serving-Gateway), or the like, but not limited thereto), or a combination thereof.

The embodiments described in the present specification may be used alone, may be used in combination, or may be used in a manner that is switched in accordance with execution. The processing procedures, timings, flowcharts, and the like of the embodiments and the embodiments described in this specification may be changed in order as long as they are not contradictory. For example, the elements of the various steps are presented in the order illustrated in the present specification with respect to the method described in the present specification, and are not limited to the particular order presented.

The various modes/embodiments described in the present specification can be applied to LTE (long term evolution (Long Term Evolution)), LTE-a (LTE-Advanced), LTE-B (LTE-Beyond), upper 3G, IMT-Advanced, 4G (4 th generation mobile communication system (4 th generation mobile communication system)), 5G (5 th generation mobile communication system (5 th generation mobile communication system)), FRA (future Radio access (Future Radio Access)), new-RAT (Radio access technology (Radio Access Technology)), NR (New Radio), NX (New Radio access)), FX (next generation Radio access (Future generation Radio access)), GSM (registered trademark) (global system for mobile communication (Global Systemfor Mobile communications)), CDMA2000, UMB (Ultra mobile broadband (Ultra Mobile Broadband)), IEEE 802.11 (Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra wide-width (Ultra wide-wide)), bluetooth (registered trademark), wireless communication methods and/or systems using other wireless communication methods, and are appropriately extended or the systems based on them.

The term "based on" as used in the present specification does not mean "based only on" unless explicitly described otherwise. In other words, the expression "based on" means "based on only" and "based on at least" both.

Any reference to elements in this specification that are referred to as "first," "second," etc. does not provide a comprehensive definition of the number or order of the elements. These designations may be used throughout this specification as a convenient method of distinguishing between 2 or more elements. Thus, reference to a first and second element does not mean that only 2 elements are employed or that the first element must precede the second element in some form.

The term "determining" used in the present specification may include various operations. The "judgment (decision)" may be regarded as "judgment (decision)" or the like, for example, calculation (computing), processing (processing), derivation (determining), investigation (investigation), search (lookup) (e.g., search in a table, database, or other data structure), confirmation (evaluation), or the like. Further, "determination (decision)" may refer to reception (e.g., receiving information), transmission (e.g., transmitting information), input (input), output (output), access (processing) (e.g., accessing data in a memory), or the like as making "determination (decision)". Further, "judgment (decision)" may be regarded as "judgment (decision)" as solving (resolving), selecting (selecting), selecting (setting), establishing (establishing), comparing (comparing), and the like. That is, "judgment (decision)" may refer to several operations as making "judgment (decision)".

The terms "connected", "coupled", and the like, or all variations thereof, as used in the present specification mean all connections or couplings, either direct or indirect, between 2 or more elements, and can include cases where 1 or more intermediate elements exist between 2 elements that are "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. As used in this specification, it is contemplated that 2 elements can be "connected" or "coupled" to each other by using 1 or more wires, cables, and/or printed electrical connections, and as several non-limiting and non-inclusive examples, by using electromagnetic energy or the like having wavelengths in the wireless frequency domain, the microwave region, and the optical (both visible and invisible) region.

In the present specification and claims, the terms "include", "include" and variations thereof are used in the same manner as the term "comprising". Further, the word "or" as used in the specification or claims means not a logical exclusive or.

The present invention has been described in detail above, but it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modifications and variations without departing from the spirit and scope of the present invention as defined in the appended claims. Accordingly, the description of the present invention is intended to be illustrative, and not limiting.

The present application is based on Japanese patent application 2016-137919 filed on day 2016, 7 and 12. The contents of which are incorporated herein in their entirety.

Claims (4)

1. A terminal, characterized by comprising:

a reception unit that receives a DL (Downlink) shared channel that is a Downlink shared channel; and

a control unit configured to determine a time slot UCI (Uplink Control Information), which is Uplink control information including retransmission control information of the DL shared channel, and to control transmission of the UCI by using an earliest UL shared channel, among 1 or more UL shared channels among cells having the smallest index number among cells corresponding to UL (Uplink) shared channels, which are Uplink shared channels, among the time slots, the earliest UL shared channel being a predetermined period after reception of the DL shared channel.

2. The terminal of claim 1, wherein,

the DL shared channel and the earliest UL shared channel have different time lengths.

3. A wireless communication method for a terminal includes:

a step of receiving a DL (Downlink) shared channel; and

determining a time slot UCI (Uplink Control Information), which is Uplink control information including retransmission control information of the DL shared channel, and controlling to transmit the UCI by using an earliest UL shared channel, among 1 or more UL shared channels among cells having the smallest index number among cells corresponding to UL (Uplink) shared channels, which are Uplink shared channels, among the time slots, the earliest UL shared channel being a predetermined period after receiving the DL shared channel.

4. A system comprising a terminal and a base station,

the terminal has:

a reception unit that receives a DL (Downlink) shared channel that is a Downlink shared channel; and

a control unit configured to determine a time slot UCI (Uplink Control Information), which is Uplink control information including retransmission control information of the DL shared channel, and to control transmission of the UCI by using an earliest UL shared channel, among 1 or more UL shared channels among cells having the smallest index number among cells corresponding to UL (Uplink) shared channels, which are Uplink shared channels, among the time slots, the earliest UL shared channels being a predetermined period after reception of the DL shared channel,

The base station has:

a transmitting unit that transmits the DL shared channel to the terminal; and

and a control unit controlling to receive the UCI from the terminal.

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