WO2018012456A1 - ユーザ端末及び無線通信方法 - Google Patents

ユーザ端末及び無線通信方法 Download PDF

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Publication number
WO2018012456A1
WO2018012456A1 PCT/JP2017/025129 JP2017025129W WO2018012456A1 WO 2018012456 A1 WO2018012456 A1 WO 2018012456A1 JP 2017025129 W JP2017025129 W JP 2017025129W WO 2018012456 A1 WO2018012456 A1 WO 2018012456A1
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WIPO (PCT)
Prior art keywords
stti
carrier
user terminal
uci
carriers
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Application number
PCT/JP2017/025129
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English (en)
French (fr)
Japanese (ja)
Inventor
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 (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 株式会社Ｎｔｔドコモ filed Critical 株式会社Ｎｔｔドコモ
Priority to JP2018527595A priority Critical patent/JP7013373B2/ja
Priority to CN201780054073.0A priority patent/CN109661847B/zh
Publication of WO2018012456A1 publication Critical patent/WO2018012456A1/ja

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention relates to a user terminal and a wireless communication method in a next generation mobile communication system.
  • LTE Long Term Evolution
  • Non-Patent Document 1 LTE-A (LTE-Advanced), FRA (Future Radio Access), 4G, 5G, 5G + (plus), NR ( New RAT) and LTE Rel.14, 15 ⁇ ) are also being considered.
  • CA Carrier Aggregation
  • CC Component Carrier
  • UE User Equipment
  • DC Dual Connectivity
  • CG Cell Group
  • CC Carrier
  • Inter-eNB CA inter-base station CA
  • 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.
  • TTI Transmission Time Interval
  • DL Downlink
  • UL Uplink
  • 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).
  • HARQ-ACK Hybrid Automatic Repeat reQuest-Acknowledge
  • 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.
  • UCI Uplink Control Information
  • TTI length time 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.
  • the user terminal communicates using a plurality of carriers (CC, cell) having the same and / or different TTI lengths.
  • CC CC
  • cell a plurality of carriers having the same and / or different TTI lengths.
  • 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
  • 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.
  • DL downlink
  • UCI uplink control information
  • TTI time length of transmission time interval
  • the user terminal 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.
  • 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.
  • a cyclic prefix (CP) is added to each symbol in the 1 ms TTI.
  • a 1 ms TTI is configured to include 14 symbols (7 symbols per slot).
  • the 1 ms TTI includes 12 symbols (6 symbols per slot).
  • the time length (symbol length) of each symbol is 66.7 ⁇ s
  • the subcarrier interval is 15 kHz. Note that the symbol length and the subcarrier interval are in a reciprocal relationship with each other.
  • TTI having a time length different from the 1 ms TTI of the existing LTE system.
  • 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).
  • 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.
  • FDD Frequency Division Duplex
  • FS frame structure
  • Time Division Duplex also called FS type 2 etc.
  • LTE Rel. 14 supports 1 slot sTTI in DL and UL
  • 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.
  • 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).
  • CC carrier aggregation
  • DC dual connectivity
  • UCI is transmitted using a UL shared channel (hereinafter also referred to as PUSCH) or a UL control channel (hereinafter abbreviated as PUCCH).
  • PUSCH UL shared channel
  • PUCCH UL control channel
  • 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).
  • CSI Channel State Information
  • SR scheduling request
  • the A / N of the PDSCH is transmitted in a TTI after a predetermined time (for example, TTI # n + 4 after 4 ms).
  • a predetermined time for example, TTI # n + 4 after 4 ms.
  • the user terminal transmits A / N using the PUSCH.
  • 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.
  • CSI non-periodic CSI transmission request
  • the UCI is transmitted with the carrier having the smallest index number.
  • 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.
  • 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.
  • UL communication for example, UL CA
  • UL CA UL communication
  • 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.
  • a PUSCH demodulation reference signal (DMRS: DeModulation Reference Signal) (Shared DMRS) of each of a plurality of sTTIs is arranged.
  • the plurality of sTTI DMRSs may be multiplexed in a shared symbol by cyclic shift (CS) and / or comb-toothed subcarrier arrangement (Comb).
  • CS cyclic shift
  • Comb comb-toothed subcarrier arrangement
  • the first half sTTI DMRS and the second half sTTI DMRS in one slot are multiplexed by CS or Comb.
  • 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.
  • 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.
  • sTTI length TTI length
  • a plurality of sPUSCHs are allocated to the same user terminal in an overlapping manner.
  • a user terminal 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.
  • 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.
  • 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.
  • CA carrier aggregation
  • DC dual connectivity
  • CG cell group
  • 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.
  • 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).
  • 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.
  • 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.
  • 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.
  • 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.
  • 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).
  • 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.
  • 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.
  • the user terminal may determine the UL carrier that transmits UCI within the same sTTI group as the DL carrier that receives PDSCH.
  • 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 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.
  • 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.
  • a sTTI feedback sTTI
  • a predetermined period for example, k sTTIs
  • 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.
  • 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.
  • 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 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.
  • the user terminal uses PUCCH (PUCCH assigned to 1 ms TTI or PUCCH assigned to sTTI (sPUCCH)).
  • PUCCH assigned to 1 ms TTI or PUCCH assigned to sTTI (sPUCCH)
  • the UCI including the A / N is transmitted.
  • the user terminal transmits the UCI including the A / N using the sPUSCH.
  • 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.
  • sPUSCH is assigned to both UL carriers 1 and 2.
  • 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.
  • sPUSCH is assigned only to UL carrier 3.
  • 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.
  • sPUSCH is allocated only to UL carrier 4.
  • 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.
  • sPUSCH is allocated to both UL carriers 3 and 4.
  • 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 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. 1 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.
  • 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.
  • a predetermined period eg, k DL sTTIs
  • 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.
  • 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.
  • the user terminal uses PUCCH (PUCCH assigned to 1 ms TTI or PUCCH assigned to sTTI (sPUCCH)).
  • PUCCH assigned to 1 ms TTI or PUCCH assigned to sTTI (sPUCCH)
  • the UCI including the A / N is transmitted.
  • the user terminal transmits the UCI including the A / N using the sPUSCH.
  • 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.
  • the UCI including the A / N of the sPDSCH is transmitted by the earliest UL sTTI # n + 8.
  • 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.
  • the UCI including the A / N of the sPDSCH is transmitted by the earliest UL sTTI # n + 3 thereafter.
  • 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.
  • 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 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.
  • 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).
  • the user terminal uses PUCCH (PUCCH assigned to 1 ms TTI or PUCCH assigned to sTTI (sPUCCH)).
  • PUCCH assigned to 1 ms TTI or PUCCH assigned to sTTI (sPUCCH)
  • the UCI including the A / N is transmitted.
  • the user terminal transmits the UCI including the A / N using the sPUSCH.
  • 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.
  • 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.
  • the user terminal receives sPDSCH on DL sTTI # n of DL carrier 1.
  • 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.
  • 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.
  • the user terminal receives sPDSCH by DL sTTI # n of DL carriers 2 and 3.
  • 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.
  • the user terminal transmits the UCI including the A / N using the sPUSCH of the UL carrier 2.
  • 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.
  • 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).
  • 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.
  • 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.
  • the carrier that transmits the UCI from the radio base station is not explicitly indicated, and the user terminal implicitly determines the carrier.
  • the user terminal 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.
  • a predetermined period for example, k DL sTTIs
  • the user terminal starts after a predetermined period (for example, k DL sTTIs) from the DL sTTI that received the sPDSCH.
  • a predetermined period for example, k DL sTTIs
  • the UCI including the A / N of the sPDSCH is transmitted.
  • 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.
  • the user terminal transmits the UCI including the A / N using the sPUSCH.
  • 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.
  • 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.
  • the user terminal may select the UL carrier with the shortest sTTI length, or may select the UL carrier with the 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.
  • 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 UL whose sTTI length is 4 symbols
  • carrier 2 is set for the user terminal.
  • the user terminal transmits the UCI including the A / N using the sPUSCH of the UL carrier 3 having a small index number. .
  • 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 UL sTTI # n + 7 of UL carrier 2 and UL sTTI # n + 12 of UL carriers 3 and 4.
  • the user terminal 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the user terminal 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.
  • a predetermined period for example, k DL sTTIs
  • the user terminal starts after a predetermined period (for example, k DL sTTIs) from the DL sTTI that received the sPDSCH.
  • a predetermined period for example, k DL sTTIs
  • the UCI including the A / N of the sPDSCH is transmitted.
  • 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.
  • 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> 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.
  • 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.
  • 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).
  • 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).
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the user terminal 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.
  • PUCCH PUCCH
  • 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.
  • 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.
  • 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 UL having an sTTI length of 4 symbols
  • carriers 2 and 3 are set for the user terminal.
  • the sTTI length of DL carrier 1 and UL carrier 1 is the same.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the UCI 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.
  • 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 and the UL carrier 3.
  • 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.
  • the instruction information is 3 bits, each bit value may indicate the index number of the UL carrier.
  • the user terminal 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.
  • PUCCH PUCCH
  • 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.
  • 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.
  • the user terminal transmits the UCI using the sPUSCH of the UL carrier indicated by the value.
  • the user terminal transmits the UCI using the sPUSCH having the smallest index number.
  • FIG. 10 is a diagram illustrating an example of UCI transmission control according to the instruction example 2 of the third mode.
  • 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.
  • 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.
  • 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.
  • the sTTI lengths of DL carriers 1 and 2 and UL carriers 1 and 2 are different.
  • 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.
  • sPUSCH of UL sTTI # n + 7 is allocated by the DL grant of DL sTTI # n + 5 of DL carriers 1 and 2.
  • UL sTTI # n + 8 sPUSCH is assigned by DL sTTI # n + 7 UL grant of DL carriers 1 and 2.
  • 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”.
  • the sPUSCH is assigned to the UL carriers 1 and 2
  • the nearest UL grant to which the sPSUCH is assigned is the sTTI # n + 5 UL grant of the carriers 1 and 2.
  • the user terminal uses the sPUSCH of the UL carrier 1 having a small index number, The UCI including the A / N is transmitted.
  • the sPUSCH is assigned to the UL carriers 0, 1 and 2
  • the most recent UL grant to which the sPSUCH is assigned is the sTTI # n + 7 UL grant of the carriers 1 and 2.
  • the user terminal 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.
  • UCI may be copied to all sPUSCHs assigned by these UL grants and transmitted.
  • the sPUSCH is assigned to the UL carriers 1 and 2
  • 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 sPUSCHs of the UL carrier 1 and the UL carrier 2, The UCI including the A / N is transmitted.
  • 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.
  • 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.
  • 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.
  • aperiodic CSI transmission of CSI
  • 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).
  • 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.
  • 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.
  • 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.
  • 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.
  • M represents the maximum number of CSI processes that the terminal can update at a time
  • X represents the number of CSI processes that the terminal can update at a time under a predetermined condition.
  • the updatable CSI process number X may be zero.
  • the CSI process number X may be equal to the maximum number M of CSI processes.
  • 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.
  • FIG. 11 is a diagram illustrating an example of aperiodic CSI transmission control according to the fourth aspect.
  • 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.
  • 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.
  • the CSI request field value “10” requests transmission of the aperiodic CSI of the CSI process corresponding to the DL carriers 1 and 2.
  • 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.
  • 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.
  • 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.
  • the user terminal can appropriately transmit the aperiodic CSI.
  • the user terminal may signal information on the sTTI length supported by the user terminal (sTTI length support information) to the radio base station.
  • 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.
  • the radio base station may set information on the sTTI length (sTTI length setting information) in the user terminal.
  • 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.
  • RRC 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
  • 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.
  • the radio base station 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).
  • 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).
  • 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) ).
  • 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.
  • 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 Wireless communication system
  • the radio communication method according to each of the above aspects is applied.
  • 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.
  • 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. .
  • the user terminal 20 is arrange
  • 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.
  • CC cells
  • the user terminal 20 can perform communication using time division duplex (TDD) or frequency division duplex (FDD) in each cell.
  • TDD time division duplex
  • FDD frequency division duplex
  • 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.
  • 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).
  • a carrier having a wide bandwidth in a relatively high frequency band for example, 3.5 GHz, 5 GHz, 30 to 70 GHz, etc.
  • 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.
  • a wired connection for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.
  • 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.
  • RNC radio network controller
  • MME mobility management entity
  • 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.
  • 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.
  • D2D inter-terminal communication
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier-frequency division multiple access
  • 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.
  • 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.
  • PDSCH Physical Downlink Shared Channel
  • PBCH Physical Broadcast Channel
  • SIB System Information Block
  • MIB Master Information Block
  • 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.
  • 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.
  • PUSCH Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • PRACH Physical Random Access Channel
  • 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.
  • 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.
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access
  • Retransmission control for example, HARQ (Hybrid Automatic Repeat reQuest) transmission processing
  • HARQ Hybrid Automatic Repeat reQuest
  • 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.
  • 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.
  • 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.
  • CPRI Common Public Radio Interface
  • X2 interface also good.
  • 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).
  • a DL signal including at least one of a DL data signal, a DL control signal, and a DL reference signal
  • a UL signal including at least one of a UL data signal, a UL control signal, and a UL reference signal.
  • 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).
  • 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.
  • control unit 301 schedules the user terminal 20.
  • the control unit 301 may perform scheduling of a plurality of carriers (DL carrier and / or UL carrier) having different sTTI lengths.
  • the control unit 301 may perform scheduling of a carrier (DL carrier and / or UL carrier) having a TTI length of 1 ms.
  • 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.
  • 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).
  • the control unit 301 transmits the DL shared channel as the feedback sTTI (first TTI).
  • the UL sTTI (second TTI) of the earliest UL carrier after a predetermined period (first to third modes).
  • 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.
  • 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).
  • 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).
  • 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).
  • 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).
  • control unit 301 may perform retransmission control of the DL shared channel (for example, PDSCH) based on A / N from the user terminal 20.
  • DL shared channel for example, PDSCH
  • 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.
  • 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).
  • 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.
  • reception processing for example, demapping, demodulation, decoding, etc.
  • 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.
  • 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.
  • 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
  • UCI 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.
  • 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).
  • a DL signal including a DL data signal, a DL control signal, and a DL reference signal
  • the UL signal (UL data signal) of the neurology. , UL control signal and UL reference signal).
  • 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).
  • 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.
  • 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.
  • 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).
  • 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).
  • 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.
  • 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).
  • 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).
  • 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).
  • 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).
  • 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.
  • 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).
  • 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.
  • a reference signal for example, CSI-RS
  • 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.
  • 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.
  • 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.
  • 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.
  • processor 1001 may be implemented by one or more chips.
  • 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.
  • predetermined software program
  • 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.
  • CPU central processing unit
  • the baseband signal processing unit 104 (204) and the call processing unit 105 described above may be realized by the processor 1001.
  • 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.
  • programs program codes
  • software modules software modules
  • data data
  • the like data
  • 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.
  • FDD frequency division duplex
  • TDD time division duplex
  • 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).
  • 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.
  • DSP digital signal processor
  • ASIC Application Specific Integrated Circuit
  • PLD Programmable Logic Device
  • FPGA Field Programmable Gate Array
  • 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.
  • a component carrier CC: Component Carrier
  • CC Component Carrier
  • 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.
  • a subframe may be composed of one or more slots in the time domain.
  • 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).
  • OFDM Orthogonal Frequency Division Multiplexing
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • 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.
  • one subframe may be referred to as a transmission time interval (TTI)
  • a plurality of consecutive subframes may be referred to as a TTI
  • one slot may be referred to as a TTI.
  • 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.
  • TTI means, for example, a minimum time unit for scheduling in wireless communication.
  • 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.
  • 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 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.
  • the resource block may be composed of one or a plurality of resource elements (RE: Resource Element).
  • RE Resource Element
  • 1RE may be a radio resource region of 1 subcarrier and 1 symbol.
  • the structure of the above-described radio frame, subframe, slot, symbol, and the like is merely an example.
  • the configuration such as the cyclic prefix (CP) length can be changed in various ways.
  • 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.
  • the radio resource may be indicated by a predetermined index.
  • mathematical formulas and the like using these parameters may differ from those explicitly disclosed herein.
  • PUCCH Physical Uplink Control Channel
  • PDCCH Physical Downlink Control Channel
  • 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.
  • 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.
  • 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.
  • DCI downlink control information
  • UCI uplink control information
  • RRC Radio Resource Control
  • MIB Master Information Block
  • SIB System Information Block
  • MAC Medium Access Control
  • 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.
  • 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)).
  • notification of predetermined information 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, instructions, information, etc. may be transmitted / received via a transmission medium.
  • 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.
  • system and “network” used in this specification are used interchangeably.
  • base station BS
  • radio base station eNB
  • cell e.g., a fixed station
  • eNodeB eNodeB
  • cell group e.g., a cell
  • carrier femtocell
  • component carrier e.g., 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.
  • RRH indoor small base station
  • MS mobile station
  • UE user equipment
  • 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.
  • NodeB NodeB
  • eNodeB eNodeB
  • access point transmission point
  • reception point femtocell
  • small cell 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.
  • the radio base station in this specification may be read by the user terminal.
  • 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).
  • the user terminal 20 may have a function that the wireless base station 10 has.
  • words such as “up” and “down” may be read as “side”.
  • the uplink channel may be read as a side channel.
  • a user terminal in this specification may be read by a radio base station.
  • the wireless base station 10 may have a function that the user terminal 20 has.
  • the specific operation assumed to be performed by the base station may be performed by the upper node in some cases.
  • 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.
  • MME Mobility Management Entity
  • S-GW Serving-Gateway
  • each aspect / embodiment described in this specification may be used alone, in combination, or may be switched according to execution.
  • 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.
  • 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.
  • 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.
  • 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.
  • “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.
  • 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.
  • 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
  • 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.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
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