WO2018012456A1

WO2018012456A1 - User terminal and wireless communications method

Info

Publication number: WO2018012456A1
Application number: PCT/JP2017/025129
Authority: WO
Inventors: 一樹武田; 聡永田; リフェワン; リューリュー; ホイリンジャン; ナーリ; ヨンリ; ムーゲンペン
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2016-07-12
Filing date: 2017-07-10
Publication date: 2018-01-18
Also published as: CN109661847A; CN109661847B; JP7013373B2; JPWO2018012456A1

Abstract

In order for a user terminal to appropriately send UCI when communicating using a plurality of carriers having the same and/or different TTI lengths, this user terminal comprises: a reception unit that receives a downlink (DL) shared channel; a transmission unit that sends uplink control information (UCI) containing resend control information for the DL shared channel; and a control unit that controls transmission of the UCI, on the basis of the UL shared channel allocations in at least one uplink (UL) carrier having the same and/or different time lengths for transmission time intervals (TTI) as the DL carrier receiving the DL shared channel.

Description

User terminal and wireless communication method

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

In the UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) has been specified for the purpose of higher data rates and lower delay (Non-Patent Document 1). In order to further increase the bandwidth and speed from LTE, LTE successor systems (for example, LTE-A (LTE-Advanced), FRA (Future Radio Access), 4G, 5G, 5G + (plus), NR ( New RAT) and LTE Rel.14, 15 ~) are also being considered.

In existing LTE systems (for example, LTE Rel. 10 or later), carrier aggregation (CA: Carrier Aggregation) that integrates multiple carriers (CC (Component Carrier), cells) is introduced to increase bandwidth. Has been. Each carrier is LTE Rel. 8 system bands are configured as one unit. In CA, a plurality of CCs of the same radio base station (eNB: eNodeB) are set as user terminals (UE: User Equipment).

In addition, in the existing LTE system (for example, LTE Rel. 12 or later), dual connectivity (DC: Dual Connectivity) in which multiple cell groups (CG: Cell Group) of different radio base stations are set in the user terminal is also introduced. ing. Each cell group includes 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).

In addition, in an existing LTE system (for example, LTE Rel. 8-13), a transmission time interval (TTI: Transmission Time Interval) (also referred to as a subframe) is used, and a downlink (DL: Downlink) and / or Uplink (UL) communication is performed. The 1 ms TTI is a transmission time unit of one channel-encoded data packet, and is a processing unit such as scheduling, link adaptation, and retransmission control (HARQ-ACK: Hybrid Automatic Repeat reQuest-Acknowledge).

In addition, in the existing LTE system (for example, LTE Rel. 8-13), uplink control information (UCI: Uplink Control Information) is used as the UL shared channel (for example, PUSCH: Physical Uplink Shared Channel) or the UL control channel (for example, Transmit using PUCCH: Physical Uplink Control Channel.

In future wireless communication systems (for example, LTE Rel. 14 or 15, 5G, NR, etc.), a TTI having a time length (TTI length) different from the 1 ms TTI of the existing LTE system for latency reduction. Supporting (eg, TTI shorter than 1 ms) is being considered.

Also, in a future wireless communication system, it is assumed that the user terminal communicates using a plurality of carriers (CC, cell) having the same and / or different TTI lengths. However, in the existing LTE system, the user terminal is not assumed to communicate using a plurality of carriers having different TTI lengths. Therefore, when the user terminal communicates using a plurality of carriers having the same and / or different TTI lengths, if the UCI transmission method in the existing LTE system is applied as it is, there is a possibility that the UCI cannot be appropriately transmitted. is there.

This invention is made in view of this point, and provides a user terminal and a radio | wireless communication method which can transmit UCI appropriately, when communicating using the several carrier with same and / or different TTI length. Is one of the purposes.

One aspect of the user terminal of the present invention includes a receiving unit that receives a downlink (DL) shared channel, a transmitting unit that transmits uplink control information (UCI) including retransmission control information of the DL shared channel, and the DL Control for controlling transmission of the UCI based on assignment of UL shared channel in one or more uplink (UL) carriers having the same and / or different time length of transmission time interval (TTI) from DL carrier that receives the shared channel And a portion.

According to the present invention, when communication is performed using a plurality of carriers having the same and / or different TTI lengths, the user terminal can appropriately transmit the UCI.

It is a figure which shows an example of several UL carrier with same and different TTI length. It is a figure which shows an example of the sTTI group which concerns on a 1st aspect. It is a figure which shows an example of the transmission control of UCI which concerns on case 1 of a 1st aspect. It is a figure which shows an example of the transmission control of UCI which concerns on case 2 of a 1st aspect. It is a figure which shows an example of the transmission control of UCI which concerns on case 3 of a 1st aspect. It is a figure which shows an example of the transmission control of UCI which concerns on a 2nd aspect. It is a figure which shows an example of the transmission control of UCI which concerns on a 2nd aspect. It is a figure which shows an example of the minimum timing of sPUSCH which concerns on a 3rd aspect. It is a figure which shows an example of the transmission control of UCI which concerns on the example 1 of an instruction | indication of a 3rd aspect. It is a figure which shows an example of the transmission control of UCI which concerns on the example 2 of an instruction | indication of a 3rd aspect. It is a figure which shows an example of the transmission control of UCI which concerns on a 4th aspect. 12A to 12D are diagrams illustrating an example of signaling according to the fifth aspect. It is a figure which shows an example of schematic structure of the radio | wireless communications system which concerns on this Embodiment. It is a figure which shows an example of the whole structure of the wireless base station which concerns on this Embodiment. It is a figure which shows an example of a function structure of the radio base station which concerns on this Embodiment. It is a figure which shows an example of the whole structure of the user terminal which concerns on this Embodiment. It is a figure which shows an example of a function structure of the user terminal which concerns on this Embodiment. It is a figure which shows an example of the hardware constitutions of the radio base station and user terminal which concern on this Embodiment.

In an existing LTE system, a user terminal performs DL and / or UL communication using a 1 ms TTI. A 1 ms TTI has a time length of 1 ms. The 1 ms TTI is also called a TTI, subframe, normal TTI, long TTI, normal subframe, long subframe, or the like, and is composed of two slots. In addition, a cyclic prefix (CP) is added to each symbol in the 1 ms TTI.

In an existing LTE system, when a normal CP (for example, 4.76 μs) is added to each symbol, a 1 ms TTI is configured to include 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 1 ms TTI includes 12 symbols (6 symbols per slot). Also, the time length (symbol length) of each symbol is 66.7 μs, and the subcarrier interval is 15 kHz. Note that the symbol length and the subcarrier interval are in a reciprocal relationship with each other.

On the other hand, in future wireless communication systems (for example, LTE Rel. 14 or 15, 5G, NR, etc.), high-speed and large-capacity communication (eMBB: enhanced Mobile Broad Band), IoT (Internet of Things) and MTC (Machine Type) Communication (M2M: Machine-to-Machine) devices (user terminals) for mass connections (mMTC: massive MTC), low-latency and high-reliability communication (URLLC: Ultra-reliable and low latency) communication) and other services are desired to be accommodated in a single framework. URLLC requires a higher delay reduction effect than eMBB and mMTC.

For this reason, in future wireless communication systems, it is considered to support a TTI having a time length different from the 1 ms TTI of the existing LTE system. For example, it is considered to support TTI shorter than 1 ms for latency reduction. The TTI shorter than 1 ms 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, frequency division duplex (FDD: Frequency Division Duplex) (also referred to as frame structure (FS) type 1) is considered to support sTTI of 2 symbols and / or sTTI of 1 slot in DL. Has been. Also, in the UL, it is considered to support at least one of 2-symbol sTTI, 4-symbol sTTI, and 1-slot sTTI.

Also, in Time Division Duplex (TDD) (also called FS type 2 etc.), LTE Rel. 14 supports 1 slot sTTI in DL and UL, and LTE Rel. From 15 onwards, it has been studied to support sTTI with fewer symbols than one slot.

Note that the sTTI of one slot may be configured to include 7 or 6 symbols as in the case of one slot of the existing LTE system, or may be configured with a different number of symbols. Further, the symbol length of each symbol may be the same as or different from the existing LTE system. Further, a CP having a predetermined time length may or may not be added to at least one symbol in sTTI. Further, at least one symbol in the sTTI may be shared with other sTTIs.

In a future wireless communication system, user terminals communicate using a plurality of carriers (CC, cells) having the same and / or different TTI lengths (for example, carrier aggregation (CA) or dual connectivity (DC)). ) Is assumed. For example, it is assumed that the user terminal performs communication using a plurality of carriers having the same and / or different number of sTTI symbols (for example, a carrier using 1 slot sTTI and a carrier using 2 symbols sTTI). The

Incidentally, in an existing LTE system (for example, 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 is retransmission control information (for example, ACK or NACK (Negative ACK) (hereinafter abbreviated as A / N) of DL shared channel (for example, PDSCH: Physical Downlink Shared Channel, hereinafter also referred to as PDSCH), It includes at least one of HARQ-ACK and the like, channel state information (CSI: Channel State Information), and scheduling request (SR).

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

Further, in the existing LTE system, when a user terminal receives a non-periodic CSI transmission request (A-CSI trigger) at TTI # n, in a TTI after a predetermined time (for example, TTI # n + 4 after 4 ms) , CSI is transmitted using PUSCH.

Also, in the existing LTE system (for example, Rel.13 CA), when a plurality of PUSCHs of different carriers (cell, CC) are allocated in the same TTI, the UCI is transmitted with the carrier having the smallest index number.

However, in the existing LTE system, the user terminal is not assumed to communicate using a plurality of UL carriers having a TTI length different from that of the DL carrier. Therefore, when the user terminal communicates using one or more UL carriers having the same and / or different TTI length as the DL carrier, the UCI is appropriately transmitted by applying the UCI transmission method in the existing LTE system as it is. There is a fear that you can not.

FIG. 1 is a diagram illustrating an example of a plurality of carriers having the same and different TTI lengths. In FIG. 1, a user terminal uses a UL carrier (UL CC) 1 in which 1 slot (for example, 7 symbols) of sTTI is used, a UL carrier 2 in which 4 symbols of sTTI are used, and a UL in which 2 symbols of sTTI are used. A case where UL communication (for example, UL CA) is performed using the

carriers

3 and 4 is shown.

In each carrier (including UL carrier and / or DL carrier), a plurality of sTTIs may be configured with different symbols, respectively, or include one or more symbols (shared symbols) shared among the plurality of sTTIs. It may be constituted by. For example, in FIG. 1, when sTTI is configured by one slot or two symbols, the plurality of sTTIs are configured by different symbols. On the other hand, when sTTI is composed of 4 symbols, a shared symbol shared between two sTTIs is provided.

In the shared symbol, a PUSCH demodulation reference signal (DMRS: DeModulation Reference Signal) (Shared DMRS) of each of a plurality of sTTIs is arranged. For example, the plurality of sTTI DMRSs may be multiplexed in a shared symbol by cyclic shift (CS) and / or comb-toothed subcarrier arrangement (Comb). For example, in FIG. 1, the first half sTTI DMRS and the second half sTTI DMRS in one slot are multiplexed by CS or Comb.

In FIG. 1, PUSCH is allocated to the user terminal in the first and fourth sTTIs from the left of the UL carrier 1. Moreover, PUSCH is allocated to the user terminal in the first and sixth sTTIs from the left of the UL carrier 2. Moreover, PUSCH is allocated with respect to a user terminal in the 1st and 9th sTTI from the left of

UL carriers

3 and 4. Note that the PUSCH assigned to the sTTI is also referred to as sPUSCH in order to distinguish it from the PUSCH assigned to the 1 ms TTI.

In the case shown in FIG. 1, it is assumed that the sPUSCH for the same user terminal is assigned to each of a plurality of sTTIs having the same and / or different TTI length (sTTI length) at the same time. For example, in FIG. 1, in the first sTTI from the left of UL carriers 1 to 4 having different TTI lengths, a plurality of sPUSCHs are allocated to the same user terminal in an overlapping manner. In this case, there is a problem of which UL carrier sPUSCH among the plurality of UL carrier sPUSCHs the UCI is multiplexed with.

Thus, when a user terminal communicates using one or more UL carriers having the same and / or different TTI length as a DL carrier, it becomes a problem as to which UL carrier is used to transmit UCI at which timing. . In addition, it becomes a problem at which timing the PUSCH of one or more UL carriers having the same and / or different TTI length as the DL carrier is allocated.

Therefore, the present inventors have studied a method of transmitting UCI using a UL carrier having the same and / or different TTI length as the DL carrier that receives the DL shared channel, and have reached the present invention. Further, the present inventors have studied the timing of PUSCH allocated to a UL carrier having the same and / or different TTI length as the DL carrier that receives the UL grant, and reached the present invention.

Hereinafter, this embodiment will be described in detail. In the following, it is assumed that the user terminal performs carrier aggregation (CA) using a plurality of carriers having the same and / or different TTI lengths, but the present invention is not limited to this. In the present embodiment, when the user terminal performs dual connectivity (DC) using a plurality of carriers having the same and / or different TTI lengths (for example, the TTI lengths are the same and / or different in the cell group (CG)). The present invention can be appropriately applied to a case where a plurality of carriers are used.

In the following, communication using a plurality of carriers having the same and / or different sTTI lengths is shown. However, in the communication according to the present embodiment, not only sTTI but also a carrier using 1 ms TTI is used. Also good. Further, the present embodiment does not exclude the case where there are TTIs with different TTI lengths (including sTTI and 1 ms TTI) in the same carrier.

In the present embodiment, the symbol length is assumed to be the same among a plurality of carriers, but is not limited thereto. The present embodiment can also be applied as appropriate when the user terminal performs communication using a plurality of carriers having different neurology. Here, the neurology is communication parameters in the frequency direction and / or the time direction (for example, subcarrier interval, bandwidth, symbol length, CP length, TTI length, number of symbols per TTI, radio frame configuration, filtering processing) , At least one of windowing processing and the like).

In the present embodiment, a user terminal receives a DL shared channel (hereinafter, also referred to as sPDSCH when distinguished from PDSCH of 1 ms TTI), and retransmission control information (hereinafter referred to as A / A) of the PDSCH. And a transmission unit that transmits UCI including N). Specifically, the user terminal transmits the UCI based on allocation of a UL shared channel (hereinafter referred to as sPUSCH) in one or more UL carriers having the same and / or different sTTI lengths from the DL carrier that receives the sPDSCH. Control (first to third aspects). The UCI may include channel state information (CSI) and / or SR in addition to PDSCH A / N.

In the present embodiment, the user terminal includes: a receiving unit that receives a UL grant including CSI transmission request information; and a transmitting unit that transmits a UCI including CSI using a PUSCH assigned by the UL grant. It has. Specifically, the user terminal performs the UCI in the UL TTI after a predetermined period from the TTI (hereinafter referred to as UL TTI) of the UL carrier corresponding to the DL carrier TTI (hereinafter referred to as DL TTI) that receives the UL grant. Is controlled (fourth aspect). The UCI may include PDSCH A / N and / or SR in addition to CSI.

(First aspect)
In the first aspect, the 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 lengths. The UCI transmission is controlled for each sTTI group.

FIG. 2 is a diagram illustrating an example of the sTTI group according to the first aspect. As shown in FIG. 2, each sTTI group includes one or more UL carriers having the same sTTI length.

For example, in FIG. 2, the sTTI group 1 includes

UL carriers

1 and 2 having an sTTI length of 1 slot. The sTTI group 2 includes

UL carriers

3 and 4 having an sTTI length of 4 symbols. The sTTI group 3 includes

UL carriers

5 and 6 having an sTTI length of 2 symbols.

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

The configuration information of each sTTI group is set by higher layer signaling (for example, RRC signaling). The configuration information may include at least one of a carrier index included in each sTTI group, a time length, the number of symbols in the sTTI, and the like. 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 setting the time length of the sTTI group and the number of symbols in the sTTI by physical layer signaling, the time length of the sTTI and the number of symbols in the sTTI are shorter than the control of the RRC signaling (for example, 1 ms, 5 ms, 10 ms, etc.). Can be switched. In this case, the user terminal may assume that the time length and the number of symbols in the sTTI are the same among the plurality of UL carriers included in each sTTI group.

Next, UCI transmission control using the sTTI group set as described above will be described. The user terminal may determine the UL carrier that transmits UCI within the same sTTI group as the DL carrier that receives PDSCH. In the following, each sTTI group is configured to include only UL carriers and DL carriers having the same sTTI length (case 1), and is configured to include UL carriers and DL carriers having different sTTI lengths (case 2). And 3) will be described UCI transmission control.

<Case 1>
Case 1 describes a case where each sTTI group includes a UL carrier having the same sTTI length and a DL carrier having the same TTI length as the UL carrier.

In Case 1, the user terminal transmits the UCI including the A / N of the sPDSCH in a sTTI (feedback sTTI) after a predetermined period (for example, k sTTIs) from the sTTI that has received the sPDSCH. In the following, an example of transmitting UCI including A / N of PDSCH will be described. However, CSI and / or SR may be included in the UCI.

FIG. 3 is a diagram illustrating an example of UCI transmission control according to Case 1 of the first aspect. For example, in FIG. 3, the sTTI group 1 includes

UL carriers

1 and 2 and a DL carrier 1 each having an sTTI length of 1 slot. The sTTI group 2 includes

UL carriers

3 and 4 and

DL carriers

2 and 3 having an sTTI length of 2 symbols. That is, in each sTTI group of FIG. 3, the sTTI length of the DL carrier and the UL carrier is the same.

In each sTTI group of FIG. 3, when sPDSCH is received in sTTI # n, the user terminal uses the UL carrier in the same sTTI group in sTTI # n + k that is the feedback sTTI to calculate the A / N of the sPDSCH. Send the included UCI. Here, 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. Note that k may be changed according to the time length.

When no sPUSCH is assigned to any UL carrier in the same sTTI group in sTTI # n + k, the user terminal uses PUCCH (PUCCH assigned to 1 ms TTI or PUCCH assigned to sTTI (sPUCCH)). The UCI including the A / N is transmitted.

In sTTI # n + k, when an sPUSCH is assigned by a single UL carrier in the same sTTI group, the user terminal transmits the UCI including the A / N using the sPUSCH.

In sTTI # n + k, when sPUSCH is allocated in a plurality of UL carriers in the same sTTI group, the user terminal uses the sPUSCH of the UL carrier with the smallest index number among the plurality of UL carriers, and uses the above A / N The UCI including is transmitted.

For example, in sTTI # n + 4 (here, k = 4) of sTTI group 1 in FIG. 3, sPUSCH is assigned to both

UL carriers

1 and 2. In this case, in sTTI # n + 4, the user terminal transmits the UCI including the A / N of the sPDSCH received in sTTI # n using the sPUSCH of the UL carrier 1 having the smaller index number among the

UL carriers

1 and 2.

Also, in sTTI # n + 4 (here, k = 4) of sTTI group 2 in FIG. 3, sPUSCH is assigned only to UL carrier 3. In this case, the user terminal transmits the UCI including the A / N of the sPDSCH received by both the

DL carriers

2 and 3 in sTTI # n using the sPUSCH of the carrier 3 in sTTI # n + 4.

Similarly, in sTTI # n + 10 of sTTI group 2 in FIG. 3, sPUSCH is allocated only to UL carrier 4. In this case, the user terminal transmits the UCI including the A / N of the sPDSCH received by both the

DL carriers

2 and 3 at sTTI # n + 6 using the sPUSCH of the carrier 4 at sTTI # n + 10.

Also, in sTTI # n + 15 of sTTI group 2 in FIG. 3, sPUSCH is allocated to both

UL carriers

3 and 4. In this case, the user terminal transmits the UCI including the A / N of the sPDSCH received by both the

DL carriers

2 and 3 in sTTI # n + 11 using the sPUSCH of the carrier 3 having a small index number in sTTI # n + 15.

<Case 2>
Case 2 describes a case where each sTTI group includes a UL carrier having the same sTTI length and a DL carrier having a TTI length different from the UL carrier. Below, it demonstrates centering on difference with the case 1. FIG.

In Case 2, the user terminal within the sTTI group, the sTTI (UL sTTI) of the earliest UL carrier starting after a predetermined period (eg, k DL sTTIs) from the sTTI (DL sTTI) that received the sPDSCH (feedback) In sTTI), UCI including A / N of the sPDSCH is transmitted.

FIG. 4 is a diagram illustrating an example of UCI transmission control according to Case 2 of the first aspect. For example, in FIG. 4, sTTI group 1 includes

UL carriers

1, 2, and 3 having an sTTI length of 4 symbols, DL carrier 1 having an sTTI length of 1 slot, DL carrier 2 having an sTTI length of 2 symbols, and 3 is comprised. That is, in sTTI group 1 in FIG. 4, there is no UL carrier having the same sTTI length as DL carrier 1-3.

As shown in FIG. 4, when the UL sTTI length in the sTTI group is different from the DL sTTI length, there is no guarantee that there is a UL sTTI that starts at the same timing as the predetermined number of DL sTTIs from the DL sTTI that received the sPDSCH. . For this reason, in FIG. 4, when receiving sPDSCH in DL sTTI # n (here, k = 4), the user terminal transmits the earliest UL sTTI (feedback) started after DL sTTI # n + k in the same sTTI group. sTTI) is used to transmit the UCI including the sPDSCH A / N.

If no sPUSCH is assigned to any UL carrier in the same sTTI group in the feedback sTTI, the user terminal uses PUCCH (PUCCH assigned to 1 ms TTI or PUCCH assigned to sTTI (sPUCCH)). The UCI including the A / N is transmitted.

In the feedback sTTI, when the sPUSCH is assigned by a single UL carrier in the same sTTI group, the user terminal transmits the UCI including the A / N using the sPUSCH.

In the feedback sTTI, when sPUSCH is allocated in a plurality of UL carriers in the same sTTI group, the user terminal uses the sPUSCH of the UL carrier with the smallest index number among the plurality of UL carriers to The UCI including is transmitted.

For example, in FIG. 4, the user terminal receives sPDSCH in DL sTTI # n of DL carrier 1, and therefore, in the same sTTI group 1, after DL sTTI # n + 4 (here, k = 4) of the DL carrier 1 The UCI including the A / N of the sPDSCH is transmitted by the earliest UL sTTI # n + 8. In UL sTTI # n + 8 in FIG. 4, sPUSCH is allocated to the user terminal in both

UL carriers

1 and 2. For this reason, in UL sTTI # n + 8, the user terminal transmits the UCI including the A / N using the sPUSCH of the UL carrier 1 having the smallest index number.

Also, in FIG. 4, since the user terminal receives the sPDSCH on DL sTTI # n of

DL carriers

2 and 3, in the same sTTI group 1, DL sTTI # n + 4 of DL carriers 2 and 3 (here, k = 4) The UCI including the A / N of the sPDSCH is transmitted by the earliest UL sTTI # n + 3 thereafter. In UL sTTI # n + 3 in FIG. 4, sPUSCH is allocated to user terminals in

UL carriers

1, 2 and 3. For this reason, in UL sTTI # n + 3, the user terminal transmits the UCI including the A / N using the sPUSCH of the UL carrier 1 having the smallest index number.

In FIG. 4, since the sTTI length of DL carrier 1 is different from the sTTI length of

DL carriers

2 and 3, the transmission timing of A / N received by DL sTTI # n of DL carrier 1, DL carrier 2 and The transmission timing of A / N of sPDSCH received by 3 DL sTTI # n + 10 is the same. That is, the earliest UL sTTI after DL sTTI # n + 4 (here, k = 4) of DL carrier 1 and the earliest UL sTTI after DL sTTI # n + 10 + 4 (here, k = 4) of

DL carriers

2 and 3 Is the same UL sTTI # n + 8.

Therefore, in FIG. 4, the user terminal uses the sPUSCH of UL carrier 1 with the smallest index number assigned in UL sTTI # n + 8, and uses the sPDSCH A / N received in DL sTTI # n of DL carrier 1 and DL The UCI including the sPDSCH A / N received in the DL sTTI # n + 10 of the

carriers

2 and 3 is transmitted.

<Case 3>
Case 3 describes a case where each sTTI group includes a UL carrier having the same sTTI length and a DL carrier having the same and different sTTI length from the UL carrier. Below, it demonstrates centering on difference with

Case

1,2.

In Case 3, when a UL carrier having the same sTTI length as the DL carrier that has received the sPDSCH exists in the sTTI group, the user terminal within the sTTI group has received a predetermined period (for example, k k) from the DL sTTI that has received the sPDSCH. The UCI including the A / N of the sPDSCH is transmitted using the UL sTTI (feedback sTTI) after DL sTTIs.

On the other hand, when the UL carrier having the same sTTI length as the DL carrier that received the sPDSCH does not exist in the sTTI group, the user terminal within the sTTI group, for a predetermined period (for example, k pieces of DL sTTI received the sPDSCH) The UCI including the A / N of the sPDSCH is transmitted using the earliest UL sTTI (feedback sTTI) starting after (DL sTTI).

In the feedback sTTI, when no sPUSCH is assigned to any UL carrier in the same sTTI group, the user terminal uses PUCCH (PUCCH assigned to 1 ms TTI or PUCCH assigned to sTTI (sPUCCH)). The UCI including the A / N is transmitted.

In the feedback sTTI, when the sPUSCH is allocated in a plurality of UL carriers in the same sTTI group, the user terminal uses the sPUSCH of the UL carrier with the smallest index number among the plurality of UL carriers, and uses the A / N The UCI including is transmitted.

FIG. 5 is a diagram illustrating an example of UCI transmission control according to Case 3 of the first aspect. For example, in FIG. 5, sTTI group 1 includes

UL carriers

1 and 2 having an sTTI length of 1 slot, DL carrier 1 having an sTTI length of 1 slot, and

DL carriers

2 and 3 having an sTTI length of 2 symbols. Consists of including. That is, in the sTTI group 1 in FIG. 5, there is an UL carrier having the same sTTI length as that of the DL carrier 1, but there is no UL carrier having the same sTTI length as that of the

DL carriers

2 and 3.

For example, in FIG. 5, the user terminal receives sPDSCH on DL sTTI # n of DL carrier 1. In this case, the user terminal transmits the UCI including the A / N of the sPDSCH in the UL sTTI # n + 4 of the UL carrier 1 after the DL sTTI # n to the DL sTTI # n. In UL sTTI # n + 4 in FIG. 5, since the sPUSCH is assigned to the user terminal in both

UL carriers

1 and 2, the user terminal uses the sPUSCH of the UL carrier 1 with the smallest index number to perform the above A / N. Send the included UCI.

Further, in FIG. 5, the user terminal receives sPDSCH by DL sTTI # n of

DL carriers

2 and 3. In this case, the user terminal transmits the UCI including the A / N of the sPDSCH with the earliest UL sTTI # n + 2 after the DL sTTI # n of the

DL carriers

2 and 3 from the DL sTTI # n. In UL sTTI # n + 2 in FIG. 5, since the sPUSCH is assigned to the user terminal in the UL carrier 2, the user terminal transmits the UCI including the A / N using the sPUSCH of the UL carrier 2.

In FIG. 5, since the sTTI length of DL carrier 1 is different from the sTTI length of

DL carriers

2 and 3 Is the same UL sTTI # n + 4.

Therefore, in FIG. 5, the user terminal uses the sPUSCH of UL carrier 1 with the smallest index number assigned in UL sTTI # n + 4, and uses the sPDSCH A / N received in DL sTTI # n of DL carrier 1 and DL The UCI including the sPDSCH A / N received in the DL sTTI # n + 10 of the

carriers

2 and 3 is transmitted.

At least one of the above cases 1-3 can be combined, and a different configuration may be used for each sTTI group. For example, the sTTI group 1 includes a DL carrier having an sTTI length different from the UL carrier as described in the

case

2 or 3, and the sTTI group 2 includes an sTTI different from the UL carrier as described in the case 1. It may be configured so as not to include a long DL carrier (that is, only a UL carrier and a DL carrier having the same sTTI length).

As described above, in the first mode, the user terminal determines the UL carrier that transmits the UCI including the A / N within the same sTTI group as the DL carrier that has received the sPDSCH. Since each sTTI group includes only the UL carrier having the same sTTI length, the user terminal can easily determine the UL carrier that transmits the UCI based on the PUSCH allocation in the UL carrier.

(Second aspect)
In the second aspect, the user terminal sets the UCI among the one or more UL carriers based on the sTTI length (TTI length) of one or more UL carriers to which the sPUSCH is assigned without setting the sTTI group. The UL carrier to be transmitted is determined. In the second aspect, the carrier that transmits the UCI from the radio base station is not explicitly indicated, and the user terminal implicitly determines the carrier.

In the second aspect, when a UL carrier having the same sTTI length as the DL carrier that has received the sPDSCH is set in the user terminal, the user terminal can perform a predetermined period (for example, k DL sTTIs) from the DL sTTI that has received the sPDSCH. ) Using the subsequent UL sTTI (feedback sTTI), the UCI including the A / N of the sPDSCH is transmitted.

On the other hand, when the UL carrier having the same sTTI length as the DL carrier that received the sPDSCH is not set in the user terminal, the user terminal starts after a predetermined period (for example, k DL sTTIs) from the DL sTTI that received the sPDSCH. Using the earliest UL sTTI (feedback sTTI), the UCI including the A / N of the sPDSCH is transmitted.

When no sPUSCH is assigned to any UL carrier set in the user terminal in the feedback sTTI, the user terminal uses the PUCCH (PUCCH assigned to 1 ms TTI or PUCCH assigned to sTTI (sPUCCH)). Is used to transmit the UCI including the A / N.

In the feedback sTTI, when the sPUSCH is assigned with a single UL carrier, the user terminal transmits the UCI including the A / N using the sPUSCH.

In the feedback sTTI, when the sPUSCH is allocated in a plurality of UL carriers having the same sTTI length, the user terminal uses the sPUSCH of the UL carrier having the smallest index number among the plurality of UL carriers, and uses the above A / N. The UCI including is transmitted.

In the feedback sTTI, when sPUSCH is allocated in a plurality of UL carriers having different sTTI lengths, the user terminal determines a UL carrier that transmits the UCI including the A / N based on the sTTI lengths of the plurality of UL carriers. To do.

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. When there are a plurality of UL carriers having the shortest (or longest) sTTI length, the user terminal may select the sPUSCH of the UL carrier having the smallest index number among the plurality of UL carriers.

FIG. 6 is a diagram illustrating an example of UCI transmission control according to the second mode. For example, in FIG. 6, DL carrier 1 and UL carrier 1 whose sTTI length is 1 slot,

DL carriers

2 and 3 whose sTTI length is 2 symbols,

UL carriers

3 and 4, and UL whose sTTI length is 4 symbols Assume that carrier 2 is set for the user terminal.

For example, as illustrated in FIG. 6, when the user terminal receives sPDSCH in DL sTTI # n of

DL carriers

2 and 3, the UCI feedback sTTI including the A / N of the sPDSCH is It is UL sTTI # n + 4 of

UL carriers

3 and 4 after 4DL sTTI (here, k = 4) of DL sTTI # n. In the UL sTTI # n + 4, since the sPUSCH is allocated to both the

UL carriers

3 and 4, the user terminal transmits the UCI including the A / N using the sPUSCH of the UL carrier 3 having a small index number. .

In addition, as illustrated in FIG. 6, when the user terminal receives sPDSCH by DL sTTI # n + 8 of DL carrier 3, the UCI feedback sTTI including the A / N of the sPDSCH is the DL sTTI # of the DL carrier 3 The earliest UL sTTI starting after n + 8 + 4 (here, k = 4), here UL sTTI # n + 7 of UL carrier 2 and UL sTTI # n + 12 of

UL carriers

3 and 4. In FIG. 6, since the sPUSCH is assigned only to sTTI # n + 7 of the UL carrier 2, the user terminal transmits the UCI including the A / N using the sPUSCH of the UL carrier 2.

Also, in FIG. 6, the user terminal feeds back UCI including the sPDSCH A / N received by DL sTTI # n of DL carrier 1 and the sPDSCH A / N received by DL sTTI # n + 10 of DL carrier 2. The sTTI is the same, and 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, sPUSCH is allocated to all of these, and the user terminal performs the above A / N using the sPUSCH of the UL carrier 3 with the smallest index number among the

UL carriers

3 and 4 with the shortest sTTI length. Send the included UCI.

FIG. 7 is a diagram illustrating another example of UCI transmission control according to the second mode. 7 is the same as FIG. 6 except that, when sPUSCH is allocated in 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. It is.

In FIG. 7, sPUSCH is assigned to all UL sTTI # n + 4 of UL carrier 1, UL sTTI # n + 8 of UL carrier 2, UL sTTI # n + 14 of

UL carriers

3 and 4, as in FIG. In this case, the user terminal selects the sPUSCH of the UL carrier 1 having the longest sTTI length, and uses the sPUSCH of the UL carrier 1 to use the sPDSCH A / N and the DL carrier 2 received by the sTTI # n of the DL carrier 1. The UCI including the sPDSCH A / N received at sTTI # n + 10 is transmitted.

As described above, in the second mode, the UL carrier that transmits the UCI is determined based on the sTTI length of one or more UL carriers to which the sPUSCH is allocated. For this reason, even if the sTTI group is not set, the user terminal can appropriately transmit the UCI. In addition, in the feedback sTTI, when sPUSCH is allocated in a plurality of UL carriers having different sTTI lengths, when UCI is fed back using the UL carrier having the shortest sTTI length, the delay time and / or processing time is shortened, and the user perceived speed Can improve. On the other hand, when the UCI is fed back using the UL carrier having the longest sTTI length, the amount and energy of radio resources that can be used for UCI transmission can be increased, so that the reliability and quality of UCI feedback can be improved.

(Third aspect)
In the third aspect, the user terminal determines the UL carrier that transmits the UCI among the one or more UL carriers to which the sPUSCH is allocated, based on the instruction information included in the UL grant, without setting the sTTI group. To do. The third aspect will be described focusing on the differences from the second aspect.

In the third aspect, when a UL carrier having the same sTTI length as the DL carrier that has received the sPDSCH is set in the user terminal, the user terminal can perform a predetermined period (for example, k DL sTTIs) from the DL sTTI that has received the sPDSCH. ) Using the subsequent UL sTTI (feedback sTTI), the UCI including the A / N of the sPDSCH is transmitted.

Also, the user terminal controls the transmission of the UCI including the A / N based on the instruction information in the UL grant to which the sPUSCH of the feedback sTTI is allocated. Here, the instruction information included in the UL grant may be 1-bit information indicating transmission or non-transmission (instruction example 1 described later), or 1 bit indicating the index of the UL carrier transmitting the UCI. The above information (for example, 3 bits) may be used (instruction example 2 described later).

<Minimum timing of sPUSCH>
In the third aspect, when a plurality of carriers having the same and / or different sTTI lengths are used, how to define the minimum timing of PUSCH scheduled by the UL grant becomes a problem. Here, the minimum timing of sPUSCH will be described. The minimum timing of the sPUSCH is applicable not only to the third mode but also to the sPUSCH allocated in the first, second, and fourth modes.

When the DL carrier that has received the UL grant and the sTTI length of the UL carrier on which the sPUSCH is scheduled by the UL grant are the same, the minimum timing of the sPUSCH is a predetermined period from the DL sTTI that has received the UL grant (for example, k UL sTTI).

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

Here, the “corresponding UL sTTI” to the DL sTTI that received the UL grant is, for example, a UL sTTI that temporally includes the DL sTTI. Further, 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. Note that k may be changed according to the time length.

FIG. 8 is a diagram illustrating an example of the minimum timing of the sPUSCH according to the third aspect. 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 transmitted to a user terminal. Shall be set.

In FIG. 8, it is preset that DL grant 1 transmits UL grant that schedules sPUSCH of UL carrier 1 and DL carrier 2 transmits UL grant that schedules sPUSCH of UL carrier 2. Shall.

For example, in FIG. 8, the sTTI length of the DL carrier 1 that receives the UL grant and the UL carrier 1 on which the sPUSCH is scheduled by the UL grant are the same. For this reason, when the user terminal receives the UL grant in the DL sTTI # n of the DL carrier 1, the minimum timing of the sPUSCH scheduled by the UL grant is UL sTTI # n + 4 (4 UL sTTI of the DL sTTI # n) Here, k = 4).

On the other hand, in FIG. 8, the sTTI lengths of the DL carrier 2 that receives the UL grant and the UL carrier 2 on which the sPUSCH is scheduled by the UL grant are different. Therefore, when the user terminal receives the UL grant in the DL sTTI # n of the DL carrier 2, the minimum timing of the sPUSCH scheduled by the UL grant is the UL sTTI of the UL carrier 2 corresponding to the DL sTTI # n. It is UL sTTI # n + 4 after 4UL sTTI from #n.

In FIG. 8, when the user terminal receives the UL grant with DL sTTI # n + 9 of DL carrier 2, the minimum timing of the sPUSCH scheduled by the UL grant is UL carrier 2 corresponding to the DL sTTI # n + 9. From UL sTTI # n + 4 to UL sTTI # n + 8 after 4UL sTTI.

<Instruction Example 1>
In the instruction example 1, a case will be described in which UL grant instruction information used for UCI transmission control in the feedback sTTI is 1-bit information indicating transmission or non-transmission. For example, when the instruction information is “1”, it indicates transmission, and when it is “0”, it indicates non-transmission.

Specifically, in the UCI feedback sTTI including A / N, when the sPUSCH is not allocated to any UL carrier set in the user terminal, the user terminal is notified of the PUCCH (the PUCCH allocated to the 1 ms TTI, Alternatively, the UCI including the A / N is transmitted using PUCCH (sPUCCH) allocated to sTTI.

In the feedback sTTI, when the sPUSCH is assigned by a single UL carrier, the user terminal controls the transmission of the UCI including the A / N based on the instruction information in the UL grant to which the sPUSCH is assigned. For example, when the instruction information is “1”, the user terminal transmits the UCI using the sPUSCH, and when the instruction information is “0”, the user terminal does not transmit the UCI using the sPUSCH.

In the feedback sTTI, when the sPUSCH is assigned by a plurality of UL carriers, the UCI including the A / N is based on the most recently received instruction information in the UL grant among the plurality of UL grants to which the sPUSCH is assigned. Control transmission. For example, when there is only one latest UL grant whose instruction information is “1”, the user terminal transmits the UCI using the sPUSCH allocated by the UL grant. When there are a plurality of the latest UL grants whose instruction information is “1”, the user terminal transmits the UCI using the sPUSCH having the smallest index number. As a result, it is possible to limit the number of UL carriers that transmit UCI to one. Therefore, when transmission power is insufficient, control for preferentially allocating transmission power to UL carriers including UCI is easily performed. Can do.

FIG. 9 is a diagram illustrating an example of UCI transmission control according to the instruction example 1 of the third mode. 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, sTTI length being 2 symbols, UL carrier 4, and UL having an sTTI length of 4 symbols Assume that

carriers

2 and 3 are set for the user terminal.

In FIG. 9, it is assumed that the sPUSCHs of

UL carriers

1, 2, 3, and 4 are scheduled in advance by the UL grants of

DL carriers

1, 2, 3, and 4, respectively.

For example, in FIG. 9, the sTTI length of DL carrier 1 and UL carrier 1 is the same. For this reason, the UL sPUSCH of DL sTTI # n of DL carrier 1 is assigned sPUSCH of UL sTTI # n + 4 after 4 sTTI from the DL sTTI # n.

In FIG. 9, the DL carrier 4 and the UL carrier 4 have the same sTTI length. For this reason, the UL sPTI of DL sTTI # n of DL carrier 4 is assigned to sPUSCH of UL sTTI # n + 4 after 4 sTTI. Similarly, UL sPUTI of 4 sTTI after DL sTTI # n + 10 of DL carrier 4 is allocated.

On the other hand, in FIG. 9, the sTTI lengths of

DL carriers

2 and 3 and

UL carriers

2 and 3 are different. For this reason, the UL grant of DL sTTI # n of

DL carriers

2 and 3 is assigned sPUSCH of UL sTTI # n + 4 after UL sTTI # n of

UL carriers

2 and 3 corresponding to DL sTTI # n. Also, UL sTTI # n + 7 of UL sTTI # n + 7 corresponding to DL sTTI # n + 7 is assigned UL sTTI # n + 4 of UL carrier 2 corresponding to DL sTTI # n + 7, and sPUSCH of UL sTTI # n + 8 after UL sTTI is allocated. In addition, UL sPUTI of DL sTTI # n + 8 of DL carrier 3 is assigned sPUSCH of UL sTTI # n + 8 after UL sTTI # n + 4 of UL carrier 3 corresponding to DL sTTI # n + 8 respectively.

As shown in FIG. 9, when the user terminal receives sPDSCH by DL sTTI # n + 3 of DL carrier 2, UCI feedback sTTI including A / N of the sPDSCH is 4DL sTTI (here, k = 4) 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. At this timing, the sPUSCH is assigned to the

UL carriers

2 and 3, and the plurality of sPUSCHs of the

UL carriers

2 and 3 are assigned by the latest UL grant. The UL grant instruction information to which the plurality of sPUSCHs are assigned is “1”. Therefore, the user terminal transmits the UCI including the A / N using the sPUSCH of the UL carrier 2 having a small index number.

Also, as shown in FIG. 9, when the user terminal receives sPDSCH on DL sTTI # n + 10 of DL carrier 2, UCI feedback sTTI including A / N of the sPDSCH is 4DL sTTI (here, k = 4 ) UL sTTI # n + 4 of UL carrier 1 later, UL sTTI # n + 8 of

UL carriers

2 and 3, and sTTI # n + 14 of UL carrier 4. At this timing, the sPUSCH is assigned to all the UL carriers 1-4, and the sPUSCH of the UL carrier 3 is assigned by the latest UL grant. The latest UL grant instruction information is “1”. Therefore, the user terminal transmits the UCI including the A / N using the sPUSCH of the UL carrier 3.

When there are a plurality of the latest UL grants whose instruction information is “1”, the UCI may be copied to all sPUSCHs assigned by these UL grants and transmitted. Thereby, since UCI can be transmitted with a plurality of UL carriers, a diversity effect can be obtained and the reliability of UCI can be improved. For example, as shown in FIG. 9, when the user terminal receives sPDSCH by DL sTTI # n + 3 of DL carrier 2, UCI feedback sTTI including A / N of the sPDSCH is 4DL sTTI (here, k = 4 ) UL sTTI # n + 2 of UL carrier 1 later, UL sTTI # n + 4 of

UL carriers

2 and 3, and the plurality of sPUSCHs of the

UL carriers

2 and 3 are assigned by the latest UL grant. The UL grant instruction information to which the plurality of sPUSCHs are assigned is “1”. Therefore, the user terminal transmits the UCI including the A / N using the sPUSCH of the UL carrier 2 and the UL carrier 3.

<Instruction Example 2>
In the instruction example 2, a case will be described in which the UL grant instruction information used for UCI transmission control in the feedback sTTI is information of 1 bit or more (for example, 3 bits) indicating the index of the UL carrier transmitting the UCI. For example, when the instruction information is 3 bits, each bit value may indicate the index number of the UL carrier.

In the feedback sTTI, when the sPUSCH is assigned with a single UL carrier, the user terminal uses the sPUSCH to indicate the UCI when the indication information in the UL grant to which the sPUSCH is assigned indicates the index number of the UL carrier. Send.

In the feedback sTTI, when the sPUSCH is assigned by a plurality of UL carriers, the UCI including the A / N is based on the most recently received instruction information in the UL grant among the plurality of UL grants to which the sPUSCH is assigned. Control transmission. For example, there is only one latest UL grant, and the UCI is transmitted using the sPUSCH of the UL carrier indicated by the instruction information in the UL grant.

Also, when there are a plurality of nearest UL grants having the same value in the instruction information, the user terminal transmits the UCI using the sPUSCH of the UL carrier indicated by the value. On the other hand, when there are a plurality of nearest UL grants having different values of the instruction information, the user terminal transmits the UCI using the sPUSCH having the smallest index number. As a result, it is possible to limit the number of UL carriers that transmit UCI to one. Therefore, when transmission power is insufficient, control for preferentially allocating transmission power to UL carriers including UCI is easily performed. Can do.

FIG. 10 is a diagram illustrating an example of UCI transmission control according to the instruction example 2 of the third mode. 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 an UL carrier 1 having an sTTI length of 4 symbols And 2 are set for the user terminal.

In FIG. 10, it is assumed that the sPUSCHs of

UL carriers

0, 1, 2, and 3 are scheduled in advance by the UL grants of

DL carriers

0, 1, 2, and 3, respectively.

For example, in FIG. 10, the sTTI length of DL carrier 0 and UL carrier 0 is the same. For this reason, the UL grant of DL sTTI # n of DL carrier 0 allocates the sPUSCH of UL sTTI # n + 4 after 4 sTTI from the DL sTTI # n.

In FIG. 10, the sTTI lengths of the DL carrier 3 and the UL carrier 3 are the same. For this reason, the UL sTTI # n + 4 sPUSCH after 4 sTTI is allocated by the DL sTTI # n UL grant of the DL carrier 3.

On the other hand, in FIG. 10, the sTTI lengths of

DL carriers

1 and 2 and

UL carriers

1 and 2 are different. For this reason, the UL grant of DL sTTI # n of DL carrier 1 assigns sPUSCH of UL sTTI # n + 4 after UL sTTI # n of UL carrier 1 corresponding to DL sTTI # n to 4UL sTTI. DL sTTI # n + 1 UL grant of DL carrier 2 assigns UL sTTI # n + 4 sPUSCH after UL sTTI # n corresponding to DL sTTI # n + 1 to UL sTTI # n of UL carrier 2. Similarly, sPUSCH of UL sTTI # n + 7 is allocated by the DL grant of DL sTTI # n + 5 of

DL carriers

1 and 2. Also, UL sTTI # n + 8 sPUSCH is assigned by DL sTTI # n + 7 UL grant of

DL carriers

1 and 2.

As shown in FIG. 10, when the user terminal receives sPDSCH by DL sTTI # n + 3 of DL carrier 1, UCI feedback sTTI including A / N of the sPDSCH is 4DL sTTI (here, k = 4) 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. At this timing, the sPUSCH is assigned to the

UL carriers

1 and 2, and the nearest UL grant to which the sPUSCH is assigned is the sTTI # n + 1 UL grant of the UL carrier 2. Therefore, the user terminal transmits the UCI including the A / N using the sPUSCH of the UL carrier 2 with the index number 2 indicated by the latest UL grant instruction information “010”.

Also, as shown in FIG. 10, when the user terminal receives sPDSCH with DL sTTI # n + 8 of DL carrier 1, UCI feedback sTTI including A / N of the sPDSCH is 4DL sTTI (here, k = 4 ) UL sTTI # n + 7 of

UL carrier

1 and 2 later and # n + 12 of UL carrier 3. At this timing, the sPUSCH is assigned to the

UL carriers

1 and 2, and the nearest UL grant to which the sPSUCH is assigned is the sTTI # n + 5 UL grant of the

carriers

1 and 2. Since the UL grants to which the sPUSCHs of the

UL carriers

1 and 2 are assigned include different instruction information “010” and “001”, the user terminal uses the sPUSCH of the UL carrier 1 having a small index number, The UCI including the A / N is transmitted.

Also, as shown in FIG. 10, when the user terminal receives sPDSCH with DL sTTI # n + 10 of DL carrier 1, UCI feedback sTTI including A / N of the sPDSCH is 4DL sTTI (here, k = 4 ) UL sTTI # 4 of UL carrier 0 later, UL sTTI # n + 8 of

UL carriers

1 and 2, and sTTI # n + 14 of UL carrier 3. At this timing, the sPUSCH is assigned to the

UL carriers

0, 1 and 2, and the most recent UL grant to which the sPSUCH is assigned is the sTTI # n + 7 UL grant of the

carriers

1 and 2. Since the UL grants to which the sPUSCHs of the

UL carriers

1 and 2 are assigned include the instruction information having the same value “001”, the user terminal uses the sPUSCH of the UL carrier 1 having the index number indicated by the “001”. Then, the UCI including the A / N is transmitted.

In addition, when there are a plurality of recent UL grants having different values for the instruction information, UCI may be copied to all sPUSCHs assigned by these UL grants and transmitted. Thereby, since UCI can be transmitted with a plurality of UL carriers, a diversity effect can be obtained and the reliability of UCI can be improved. For example, as shown in FIG. 10, when the user terminal receives sPDSCH by DL sTTI # n + 8 of DL carrier 1, the UCI feedback sTTI including the A / N of the sPDSCH is 4DL sTTI (here, k = 4 ) UL sTTI # n + 7 of

UL carrier

UL carriers

carriers

1 and 2. Since the UL grants to which the sPUSCHs of the

UL carriers

1 and 2 are assigned include different instruction information “010” and “001”, the user terminal uses the sPUSCHs of the UL carrier 1 and the UL carrier 2, The UCI including the A / N is transmitted.

As described above, in the third mode, the UL carrier that transmits the UCI is determined based on the instruction information in the UL grant to which the sPUSCH is allocated. For this reason, even if the sTTI group is not set, the user terminal can appropriately transmit the UCI.

(Fourth aspect)
In the fourth aspect, UCI transmission control including aperiodic CSI will be described. The UCI may be composed of CSI alone, or may include A / N and / or SR in addition to CSI. The fourth aspect can be combined with any of the first to third aspects, and will be described focusing on the differences from the first to third aspects.

In the fourth aspect, the user terminal receives the UL grant including the CSI transmission request information. The user terminal controls transmission of CSI (hereinafter referred to as aperiodic CSI) using PUSCH assigned by the UL grant in a UL TTI after a predetermined number of UL sTTI corresponding to the DL sTTI that receives the UL grant. (4th aspect).

When the DL carrier that received the UL grant and the sTTI length of the UL carrier on which the sPUSCH is scheduled by the UL grant are the same, the minimum timing of the sPUSCH including the aperiodic CSI is determined from the DL sTTI that received the UL grant. UL sTTI after a predetermined period (for example, k sTTIs).

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

Here, the UL sTTI corresponding to the DL sTTI that received the UL grant is, for example, the UL sTTI that temporally includes the DL sTTI. Further, 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. Note that k may be changed according to the time length.

Also, the CSI transmission request information is information requesting transmission of aperiodic CSI, and may be, for example, Aperiodic (A) -CS trigger, the value of the CSI request field, or the like. The CSI request field value in the UL grant indicates which aperiodic CSI is not transmitted or which CSI process is requested to transmit the aperiodic CSI. The CSI process corresponds to a DL carrier (cell, CC).

The user terminal has the capability X of the user terminal, and the number of CSI processes X (0) for updating the CSI information according to at least one of the timings (scheduling timings) at which the UL grant including the non-periodic CSI transmission request schedules the sPUSCH. ≦ X ≦ M) may be determined. 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 predetermined condition.

For example, when the time length from UL grant reception including the transmission request of the non-periodic CSI to sPUSCH scheduled by the UL grant is short, the updatable CSI process number X may be zero. Further, when the time length from the UL grant reception including the transmission request of the non-periodic CSI to the sPUSCH 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 time length from UL grant reception including the transmission request of the non-periodic CSI to sPUSCH scheduled by the UL grant. When the value of X is smaller than the number of CSI processes required in the aperiodic CSI, the CSI process to be updated is determined from the CSI process having a small index number.

FIG. 11 is a diagram illustrating an example of aperiodic CSI transmission control according to the fourth aspect. 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 transmitted to a user terminal. Shall be set.

In FIG. 11, it is set in advance that UL grant for scheduling the sPUSCH of UL carrier 1 is transmitted in DL carrier 1 and UL grant for scheduling the sPUSCH in UL carrier 2 is transmitted in DL carrier 2. Shall.

For example, in FIG. 11, the sTTI length of the DL carrier 1 that receives the UL grant including the CSI request field value “10” and the UL carrier 1 on which the sPUSCH is scheduled by the UL grant are the same. In FIG. 11, it is assumed that the CSI request field value “10” requests transmission of the aperiodic CSI of the CSI process corresponding to the

DL carriers

1 and 2. For this reason, the user terminal transmits the aperiodic CSI of the CSI process corresponding to

DL carriers

1 and 2 in UL sTTI # n + 4 after 4 UL sTTI of DL sTTI # n of DL carrier 1.

On the other hand, in FIG. 11, the sTTI lengths of the DL carrier 2 that receives the UL grant including the CSI request field “01” and the UL carrier 2 on which the sPUSCH is scheduled by the UL grant are different. Further, in FIG. 11, it is assumed that the CSI request field value “01” requests transmission of the aperiodic CSI of the CSI process corresponding to the DL carrier 2. Therefore, the user terminal transmits the aperiodic CSI of the CSI process corresponding to the DL carrier 2 in the UL sTTI # n + 4 after 4 UL sTTI from the UL sTTI # n corresponding to the DL sTTI # n of the DL carrier 2.

As described above, in the fourth aspect, even when a UL carrier having the same and / or different sTTI length as that of the DL carrier is used, the user terminal can appropriately transmit the aperiodic CSI.

(5th aspect)
In the fifth aspect, signaling used in at least one of the first to fourth aspects will be described.

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

Also, in the fifth aspect, the radio base station may set information on the sTTI length (sTTI length setting information) in the user terminal. Here, the sTTI length setting information includes the sTTI length that can be used by the user terminal, whether to support different TTI lengths in DL and UL, whether to set sTTI groups, and the configuration of each sTTI group At least one of the information may be indicated.

FIG. 12 is a diagram illustrating an example of signaling according to the fifth aspect. The signaling shown in FIG. 12 includes upper layer signaling (for example, RRC signaling), system information (for example, MIB (Master Information Block), SIB (System Information Block)), L1 / L2 control channel (for example, PDCCH and // EPDCCH) may be used.

For example, in FIG. 12A, the user terminal, as sTTI support information, (1) sTTI length supported by the user terminal (here, 2 and 7 symbols for DL carrier, 2, 3 or 4 symbols for UL carrier, 7 symbols) ) And (2) that different sTTI lengths are not supported for the DL carrier and the UL carrier. FIG. 12B is different from FIG. 12A in that (2) it is notified that DL carriers and UL carriers support different sTTI lengths.

Also, in FIG. 12C, the radio base station, as sTTI setting information, (1) gives the user terminal a predetermined sTTI length (here, 2 and 7 symbols for the DL carrier, 2 and 7 symbols for the UL carrier), ( 2) Notifying the user terminal of the sTTI group including the sTTI group (first mode). For example, in FIG. 12C, the radio base station includes an sTTI group 1 configured with an UL carrier and a DL carrier with 2 symbols of sTTI length, and an sTTI group 2 configured with an UL carrier and a DL carrier with sTTI length of 7 symbols. May be set (Case 1 of the first mode).

Also, in FIG. 12D, the radio base station provides (1) a predetermined sTTI length (in this case, 2 and 7 symbols for the DL carrier, 3 or 4 symbols and 7 symbols for the UL carrier) as the sTTI setting information. ) And (2) Do not set sTTI group (first mode), or (3) Notify sTTI group including sTTI group with sTTI length different from UL carrier (

cases

1 and 2 of the first mode) ).

For example, in FIG. 12D, the radio base station includes an sTTI group 1 (case 2 of the first mode) configured by an UL carrier having an sTTI length of 2 symbols and a DL carrier having an sTTI length of 3 or 4 symbols, You may set sTTI group 2 (case 1 of a 1st aspect) comprised by the UL carrier and DL carrier of the sTTI length of a symbol.

(Wireless communication system)
Hereinafter, the configuration of the wireless communication system according to the present embodiment will be described. In this radio communication system, the radio communication method according to each of the above aspects is applied. In addition, the radio | wireless communication method which concerns on each said aspect may be applied independently, respectively, and may be applied in combination.

FIG. 13 is a diagram illustrating an example of a schematic configuration of the wireless communication system according to the present embodiment. In the radio communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit are applied. can do. The wireless communication system 1 is called SUPER 3G, LTE-A (LTE-Advanced), IMT-Advanced, 4G, 5G, FRA (Future Radio Access), NR (New Radio Access Technology), etc. Also good.

A radio communication system 1 shown in FIG. 13 includes a radio base station 11 that forms a macro cell C1, and radio base stations 12a to 12c that are arranged in the macro cell C1 and form a small cell C2 that is narrower than the macro cell C1. . Moreover, the user terminal 20 is arrange | positioned at the macrocell C1 and each small cell C2. It is good also as a structure by which a different neurology is applied between cells and / or within a cell.

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 that use different frequencies simultaneously by CA or DC. In addition, the user terminal 20 can apply CA or DC using a plurality of cells (CC) (for example, two or more CCs). Further, the user terminal can use the license band CC and the unlicensed band CC as a plurality of cells.

Further, the user terminal 20 can perform communication using time division duplex (TDD) or frequency division duplex (FDD) in each cell. The TDD cell and the FDD cell may be referred to as a TDD carrier (frame configuration type 2), an FDD carrier (frame configuration type 1), and the like, respectively.

In each cell (carrier), a single neurology may be applied, or a plurality of different neurology may be applied.

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

Between the wireless base station 11 and the wireless base station 12 (or between the two wireless base stations 12), a wired connection (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.) or a wireless connection It can be set as the structure to do.

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

The radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like. The radio base station 12 is a radio base station having local coverage, and includes a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), and transmission / reception. It may be called a point. Hereinafter, when the

radio base stations

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

Each user terminal 20 is a terminal compatible with various communication methods such as LTE and LTE-A, and may include not only a mobile communication terminal but also a fixed communication terminal. Further, the user terminal 20 can perform inter-terminal communication (D2D) with other user terminals 20.

In the radio communication system 1, OFDMA (orthogonal frequency division multiple access) can be applied to the downlink (DL) and SC-FDMA (single carrier-frequency division multiple access) is applied to the uplink (UL) as the radio access scheme. it can. OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier. SC-FDMA is a single-carrier transmission scheme that reduces interference between terminals by dividing the system bandwidth into bands consisting of one or continuous resource blocks for each terminal and using a plurality of terminals with mutually different bands. is there. The uplink and downlink radio access schemes are not limited to these combinations, and OFDMA may be used in the UL.

In the wireless communication system 1, as a DL channel, a DL shared channel (PDSCH: Physical Downlink Shared Channel, also referred to as DL data channel) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), L1 / L2 A control channel or the like is used. User data, higher layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. Also, MIB (Master Information Block) is transmitted by PBCH.

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

In the wireless communication system 1, as a UL channel, a UL shared channel (PUSCH: Physical Uplink Shared Channel, also referred to as a UL data channel) shared by each user terminal 20, a UL control channel (PUCCH: Physical Uplink Control Channel), random An access channel (PRACH: Physical Random Access Channel) or the like is used. User data and higher layer control information are transmitted by the PUSCH. Uplink control information (UCI) including at least one of retransmission control information (A / N), channel state information (CSI), and the like of a DL signal is transmitted by PUSCH or PUCCH. The PRACH can transmit a random access preamble for establishing a connection with a cell.

<Wireless base station>
FIG. 14 is a diagram illustrating an example of the overall configuration of the radio base station according to the present embodiment. The radio base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. Note that each of the transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may be configured to include one or more.

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

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

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

The transmitter / receiver, the transmission / reception circuit, or the transmission / reception device can be configured based on common recognition in the technical field according to the present invention. In addition, the transmission / reception part 103 may be comprised as an integral transmission / reception part, and may be comprised from a transmission part and a receiving part.

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

The baseband signal processing unit 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, error correction on UL data included in the input UL signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106. The call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.

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

Further, the transmission / reception unit 103 transmits a DL signal (including at least one of a DL data signal, a DL control signal, and a DL reference signal) to the plurality of user terminals 20 having different nuemologies, and the plurality of user terminals 20 receives a UL signal (including at least one of a UL data signal, a UL control signal, and a UL reference signal).

Further, the transmission / reception unit 103 receives the UCI from the user terminal 20 using the UL shared channel (for example, PUSCH) or the UL control channel (for example, PUCCH). The UCI includes at least one of A / N, CSI, and SR of a DL shared channel (for example, PDSCH, sPDSCH for sTTI).

Further, the transmission / reception unit 103 may receive the sTTI support information from the user terminal 20 (fifth aspect). Moreover, the transmission / reception part 103 may transmit sTTI setting information with respect to the user terminal 20 (5th aspect).

FIG. 15 is a diagram illustrating an example of a functional configuration of the radio base station according to the present embodiment. Note that FIG. 15 mainly shows functional blocks of characteristic portions in the present embodiment, and the wireless base station 10 also has other functional blocks necessary for wireless communication. As illustrated 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 includes, for example, DL signal generation by the transmission signal generation unit 302, DL signal mapping by the mapping unit 303, UL signal reception processing (for example, demodulation) by the reception signal processing unit 304, and measurement unit 305. Control the measurement.

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

Further, the control unit 301 may set a plurality of carriers (DL carrier and / or UL carrier) having the same and / or different sTTI length for 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 channel.

Also, the control unit 301 may determine sTTI (feedback sTTI) for receiving UCI including A / N of the DL shared channel. Specifically, when the sTTI length of the DL carrier that transmits the DL shared channel and the UL carrier that receives the UL shared channel are the same, the control unit 301 transmits the DL shared channel as feedback sTTI. The UL sTTI after a predetermined period may be determined (first to third modes).

In addition, when the sTTI length of the DL carrier that transmits the DL shared channel is different from the UL carrier that receives the UL shared channel, the control unit 301 transmits the DL shared channel as the feedback sTTI (first TTI). ) To determine the UL sTTI (second TTI) of the earliest UL carrier after a predetermined period (first to third modes).

In addition, the control unit 301 determines the UCI including the A / N of the DL shared channel based on the allocation of the UL shared channel in one or more UL carriers having the same and / or different sTTI length as the DL carrier that receives the DL shared channel. May be controlled. Specifically, the control unit 301 may control reception of the UCI including the A / N based on the allocation of the UL shared channel in the feedback sTTI.

For example, the control unit 301 sets an sTTI group including one or more UL carriers having the same sTTI length and one or more DL carriers that are the same and / or different from the UL carrier, and transmits the DL shared channel. The UL carrier that receives the UCI including the A / N may be determined within the same group as the DL carrier (first mode).

Also, the control unit 301 may determine the UL carrier that receives the UCI including the A / N based on the sTTI length of one or more UL carriers to which the UL shared channel is allocated (second mode). Moreover, the control part 301 may determine the UL carrier which receives UCI containing said A / N based on the instruction information contained in UL grant which allocates a UL shared channel (3rd aspect).

In addition, when the sTTI length of the DL carrier that transmits the UL grant and the UL carrier to which the UL shared channel is allocated by the UL grant is the same, the control unit 301 performs a predetermined period from the DL sTTI that transmits the UL grant. The UL sTTI may be determined as the sTTI for receiving the UL shared channel (first to fourth modes).

In addition, when the sTTI length of the DL carrier that transmits the UL grant and the UL carrier to which the UL shared channel is allocated is different, the control unit 301 transmits the UL grant. DL sTTI (third TTI) The UL sTTI (fifth TTI) after a predetermined period from the UL sTTI (fourth sTTI) corresponding to may be determined as the sTTI for receiving the UL shared channel (first to fourth modes).

Also, the control unit 301 may perform retransmission control of the DL shared channel (for example, PDSCH) based on A / N from the user terminal 20.

Further, the control unit 301 may control aperiodic CSI reporting. Specifically, the control unit 301 determines the CSI request field value, and controls to generate and transmit the UL grant including the CSI request field value.

In addition, when the sTTI length of the DL carrier that transmits the UL grant including the CSI request field value and the UL carrier to which the UL shared channel is allocated by the UL grant are the same, the control unit 301 transmits the UL grant. The UL sTTI after a predetermined period from the DL sTTI may be determined as the sTTI that receives the aperiodic CSI (fourth mode).

In addition, when the sTTI length of the DL carrier that receives the UL grant including the CSI request field value and the UL carrier to which the UL shared channel is allocated is different from the UL grant, the control unit 301 transmits the UL grant. The UL sTTI after a predetermined period from the UL sTTI corresponding to sTTI may be determined as the sTTI that receives the aperiodic CSI (fourth mode).

The control unit 301 can be configured by a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.

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

The transmission signal generation unit 302 can be a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.

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

The reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the UL signal (for example, UL data signal, UL control signal, UCI, sTTI support information, etc.) transmitted from the user terminal 20. )I do. Specifically, the reception signal processing unit 304 performs UL signal reception processing based on the neurology set in the user terminal 20. The reception signal processing unit 304 may output a reception signal or a signal after reception processing to the measurement unit 305. Reception signal processing section 304 performs reception processing on the A / N of the DL signal and outputs ACK or NACK to control section 301.

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

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

<User terminal>
FIG. 16 is a diagram illustrating an example of the overall configuration of the user terminal according to the present embodiment. The user terminal 20 includes a plurality of transmission / reception antennas 201 for MIMO transmission, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205.

The radio frequency signals received by the plurality of transmission / reception antennas 201 are each amplified by the amplifier unit 202. Each transmitting / receiving unit 203 receives the DL signal amplified by the amplifier unit 202. The transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204.

The baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, and the like on the input baseband signal. The DL data is transferred to the application unit 205. The application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. Broadcast information is also transferred 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 unit 204 performs retransmission control transmission processing (for example, HARQ transmission processing), channel coding, rate matching, puncturing, discrete Fourier transform (DFT) processing, IFFT processing, and the like. Are transferred to each transmitting / receiving unit 203. UCI (for example, DL retransmission control information, channel state information, and the like) is also subjected to channel coding, rate matching, puncturing, DFT processing, IFFT processing, and the like, and is transferred to each transmission / reception section 203.

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

In addition, the transmission / reception unit 203 receives a DL signal (including a DL data signal, a DL control signal, and a DL reference signal) of the neurology set in the user terminal 20 and receives the UL signal (UL data signal) of the neurology. , UL control signal and UL reference signal).

Further, the transmission / reception unit 203 transmits UCI to the radio base station 10 using a UL shared channel (for example, PUSCH) or a UL control channel (for example, PUCCH). The UCI includes at least one of A / N, CSI, and SR of a DL shared channel (for example, PDSCH, sPDSCH for sTTI).

Further, the transmission / reception unit 203 may transmit sTTI support information to the radio base station 10 (fifth aspect). Further, the transmission / reception unit 203 may receive sTTI setting information from the radio base station 10 (fifth aspect).

The transmission / reception unit 203 can be a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention. Further, the transmission / reception unit 203 may be configured as an integral transmission / reception unit, or may be configured from a transmission unit and a reception unit.

FIG. 17 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment. Note that FIG. 17 mainly shows functional blocks of characteristic portions in the present embodiment, and the user terminal 20 also has other functional blocks necessary for wireless communication. As illustrated 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. I have.

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

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

Further, the control unit 401 may determine sTTI (feedback sTTI) for transmitting UCI including A / N of the DL shared channel. Specifically, when the sTTI length of the DL carrier that receives the DL shared channel and the UL carrier that transmits the UL shared channel are the same, the control unit 401 receives the DL shared channel as a feedback sTTI. The UL sTTI after a predetermined period may be determined (first to third modes).

In addition, when the sTTI length of the DL carrier that receives the DL shared channel is different from the UL carrier that transmits the UL shared channel, the control unit 401 uses the DL sTTI (first TTI) that receives the DL shared channel as a feedback sTTI. ) To determine the UL sTTI (second TTI) of the earliest UL carrier after a predetermined period (first to third modes).

In addition, the control unit 401, based on the allocation of the UL shared channel in one or more UL carriers having the same and / or different sTTI length from the DL carrier that receives the DL shared channel, includes the UCI including the A / N of the DL shared channel. May be controlled. Specifically, the control unit 401 may control the transmission of the UCI including the A / N based on the allocation of the UL shared channel in the feedback sTTI.

For example, the control unit 401 sets an sTTI group including one or more UL carriers having the same sTTI length and one or more DL carriers that are the same and / or different from the UL carrier, and receives the DL shared channel. The UL carrier that transmits the UCI including the A / N may be determined within the same group as the DL carrier (first mode).

Also, the control unit 401 may determine the UL carrier that transmits the UCI including the A / N based on the sTTI length of one or more UL carriers to which the UL shared channel is allocated (second mode). Moreover, the control part 401 may determine the UL carrier which transmits UCI containing the said A / N based on the instruction information contained in UL grant which allocates a UL shared channel (3rd aspect).

In addition, when the sTTI length of the DL carrier that receives the UL grant and the UL carrier to which the UL shared channel is allocated by the UL grant is the same, the control unit 401 performs a predetermined period after the DL sTTI that receives the UL grant. The UL sTTI may be determined as the sTTI for transmitting the UL shared channel (first to fourth modes).

In addition, when the sTTI length of the DL carrier that receives the UL grant and the UL carrier to which the UL shared channel is allocated is different, the control unit 401 receives the UL grant. DL sTTI (third TTI) The UL sTTI (fifth TTI) after a predetermined period from the UL sTTI (fourth sTTI) corresponding to may be determined as the sTTI for transmitting the UL shared channel (first to fourth modes).

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

For example, the control unit 401 receives the UL grant when the DL carrier that receives the UL grant including the CSI request field value and the UL carrier to which the UL shared channel is allocated by the UL grant have the same sTTI length. The UL sTTI after a predetermined period from the DL sTTI may be determined as the sTTI for transmitting the aperiodic CSI (fourth mode).

In addition, when the sTTI length of the DL carrier that receives the UL grant including the CSI request field value and the UL carrier to which the UL shared channel is allocated is different from the UL grant, the control unit 301 receives the UL grant. The UL sTTI after a predetermined period from the UL sTTI corresponding to sTTI may be determined as the sTTI for transmitting the aperiodic CSI (fourth mode).

The control unit 401 can be configured by a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.

The transmission signal generation unit 402 generates a UL signal (including UL data signal, UL control signal, UL reference signal, UCI, sTTI support information) based on an instruction from the control unit 401 (for example, encoding, rate matching) , Puncture, modulation, etc.) and output to the mapping unit 403. The transmission signal generation unit 402 may be a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.

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

The reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the DL signal (DL data signal, scheduling information, DL control signal, DL reference signal, sTTI setting information). The reception signal processing unit 404 outputs information received from the radio 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 by higher layer signaling such as RRC signaling, physical layer control information (L1 / L2 control information), and the like to the control unit 401.

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

The measurement unit 405 measures the channel state based on a reference signal (for example, CSI-RS) from the radio base station 10 and outputs the measurement result to the control unit 401. Note that the channel state measurement may be performed for each CC.

The measuring unit 405 can be composed of a signal processor, a signal processing circuit or a signal processing device, and a measuring device, a measurement circuit or a measuring device which are explained based on common recognition in the technical field according to the present invention.

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

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

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

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

For example, each function in the radio base station 10 and the user terminal 20 reads predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs computation and communication by the communication device 1004. Alternatively, it is realized by controlling data reading and / or writing in the memory 1002 and the storage 1003.

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

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

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

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

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

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

Also, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.

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

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

Also, the radio frame may be configured with one or a plurality of periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may be referred to as a subframe. Further, a subframe may be composed of one or more slots in the time domain. Further, the slot may be configured with one or a plurality of symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time domain).

The radio frame, subframe, slot, and symbol all represent a time unit when transmitting a signal. Different names may be used for the radio frame, the subframe, the slot, and the symbol. For example, one subframe may be referred to as a transmission time interval (TTI), a plurality of consecutive subframes may be referred to as a TTI, and one slot may be referred to as a TTI. That is, the subframe or TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Also good.

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

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

A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain. Further, the RB may include one or a plurality of symbols in the time domain, and may have a length of one slot, one subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks. The RB may be called a physical resource block (PRB: Physical RB), a PRB pair, an RB pair, or the like.

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

Note that the structure of the above-described radio frame, subframe, slot, symbol, and the like is merely an example. For example, the number of subframes included in the radio frame, the number of slots included in the subframe, the number of symbols and RBs included in the slot, the number of subcarriers included in the RB, and the number of symbols in the TTI, the symbol length, The configuration such as the cyclic prefix (CP) length can be changed in various ways.

In addition, information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information. . For example, the radio resource may be indicated by a predetermined index. Further, mathematical formulas and the like using these parameters may differ from those explicitly disclosed herein.

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

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

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

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

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

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

In addition, notification of predetermined information (for example, notification of “being X”) is not limited to explicitly performed, but implicitly (for example, by not performing notification of the predetermined information or another (By notification of information).

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

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

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

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

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

The base station can accommodate one or a plurality of (for example, three) cells (also called sectors). If the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, an indoor small base station (RRH: The term “cell” or “sector” refers to part or all of the coverage area of a base station and / or base station subsystem that provides communication service in this coverage. Point to.

In this specification, the terms “mobile station (MS)”, “user terminal”, “user equipment (UE)”, and “terminal” may be used interchangeably. A base station may also be called in terms such as a fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and small cell.

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

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

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

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

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

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

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

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

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

As used herein, the terms “connected”, “coupled”, or any variation thereof, refers to any direct or indirect connection between two or more elements or By coupling, it can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. As used herein, the two elements are radio frequency by using one or more wires, cables and / or printed electrical connections, and as some non-limiting and non-inclusive examples By using electromagnetic energy, such as electromagnetic energy having a wavelength in the region, microwave region, and light (both visible and invisible) region, it can be considered to be “connected” or “coupled” to each other.

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

Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

This application is based on Japanese Patent Application No. 2016-137919 filed on July 12, 2016. All this content is included here.

Claims

A receiver for receiving a downlink (DL) shared channel;
A transmitter for transmitting uplink control information (UCI) including retransmission control information of the DL shared channel;
The transmission of the UCI is controlled based on the allocation of the UL shared channel in one or more uplink (UL) carriers whose transmission time interval (TTI) is the same and / or different in length from the DL carrier that receives the DL shared channel. A control unit,
A user terminal comprising:
The control unit sets a group including one or more UL carriers having the same time length, and one or more DL carriers having the same time length and / or different from the UL carrier,
The user terminal according to claim 1, wherein a UL carrier that transmits the UCI is determined within the same group as a DL carrier that receives the DL shared channel.
The user terminal according to claim 1, wherein the control unit determines a UL carrier that transmits the UCI based on the time length of the UL carrier to which the UL shared channel is allocated.
The user terminal according to claim 1, wherein the control unit determines a UL carrier that transmits the UCI based on instruction information included in a UL grant to which the UL shared channel is allocated.
In the second TTI of the earliest UL carrier after a predetermined period from the first TTI that receives the DL shared channel when the DL carrier and the UL carrier have different time lengths, The user terminal according to any one of claims 1 to 4, wherein transmission of the UCI is controlled based on assignment of a UL shared channel.
When the time length of the DL carrier that receives the UL grant to which the UL shared channel is allocated is different from the time length of the UL carrier, a predetermined period from the fourth TTI of the UL carrier corresponding to the third TTI that receives the UL grant The user terminal according to any one of claims 1 to 5, wherein the UL shared channel is allocated in a subsequent fifth TTI.
Receiving a downlink (DL) shared channel at a user terminal;
In the user terminal, transmitting uplink control information (UCI) including retransmission control information of the DL shared channel;
In the user terminal, based on the allocation of the UL shared channel in one or more uplink (UL) carriers having the same and / or different time length of the transmission time interval (TTI) from the DL carrier that receives the DL shared channel, Controlling the transmission of UCI;
A wireless communication method comprising: