WO2018056760A1 - Procédé et appareil de transmission d'informations d'état de canal dans une structure de trame d'un intervalle de temps de transmission court - Google Patents

Procédé et appareil de transmission d'informations d'état de canal dans une structure de trame d'un intervalle de temps de transmission court Download PDF

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WO2018056760A1
WO2018056760A1 PCT/KR2017/010496 KR2017010496W WO2018056760A1 WO 2018056760 A1 WO2018056760 A1 WO 2018056760A1 KR 2017010496 W KR2017010496 W KR 2017010496W WO 2018056760 A1 WO2018056760 A1 WO 2018056760A1
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Prior art keywords
time interval
transmission time
state information
channel state
short transmission
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PCT/KR2017/010496
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English (en)
Korean (ko)
Inventor
김기태
최우진
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주식회사 케이티
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Priority claimed from KR1020170118923A external-priority patent/KR102186397B1/ko
Application filed by 주식회사 케이티 filed Critical 주식회사 케이티
Priority to CN201780058930.4A priority Critical patent/CN109792315B/zh
Priority to US16/335,717 priority patent/US10849111B2/en
Publication of WO2018056760A1 publication Critical patent/WO2018056760A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • the present disclosure relates to an operation of a terminal and a base station for transmitting and receiving channel state information in a short transmission time interval frame structure of a 3GPP LTE / LTE-Advanced system.
  • Latency reduction is to standardize the operation of shorter transmission time intervals (hereinafter referred to as 'short TTI' or 'sTTI') to improve TCP throughput.
  • An object of the present embodiments is to provide a specific operation scheme of a terminal and a base station for determining a channel state information measurement period and a channel state information to be transmitted in a frame structure based on a short transmission time interval.
  • an embodiment of the present invention provides a method for a user equipment to transmit channel state information (CSI) in a frame structure of a short transmission time interval (sTTI).
  • CSI channel state information
  • sTTI short transmission time interval
  • Receiving type information of a short transmission time interval through RRC signaling determining a channel period information transmission period of a short transmission time interval based on the type information of a short transmission time interval, and transmitting channel state information of a general transmission time interval
  • Normal transmission time interval is set to 12 or 14 symbols
  • short transmission time provides a method characterized in that it is set to two or four or seven symbols.
  • the RRC may include information about the type of information on a short transmission time interval. Transmitting to the terminal through signaling, receiving channel state information determined according to the channel state information transmission period of the general transmission time interval and the channel state information transmission period of the short transmission time interval, and the received channel state information from the terminal. And determining downlink data transmission settings and parameters for the terminal on the basis of the information, wherein channel state information is determined based on the type information of the short transmission time interval, and the general transmission time interval is set to 12 or 14 symbols. And a short transmission time interval is set to 2 or 4 or 7 symbols.
  • CSI channel state information
  • sTTIs short transmission time intervals
  • an embodiment is a terminal for transmitting channel state information (CSI) in a frame structure of a short transmission time interval (sTTI), the short transmission time interval through the RRC signaling from the base station Receiving unit for receiving type information, based on the type information of the short transmission time interval to determine the channel state information transmission period of the short transmission time interval, and transmits the channel state information transmission period of the general time interval and the channel state information of the short transmission time interval
  • CSI channel state information
  • sTTI short transmission time interval
  • a control unit for determining channel state information to be transmitted to the base station according to a period and a transmitter for transmitting channel state information to be transmitted to the base station through an uplink control channel having a short transmission time interval, wherein a general transmission time interval is 12 or 14 symbols.
  • Short transmission time interval set to 2 or 4 or 7 symbols It provides a terminal characterized by.
  • a base station that receives channel state information (CSI) in a frame structure of a short transmission time interval (sTTI)
  • RRC signaling is performed by using the type information of the short transmission time interval.
  • a receiver for receiving channel state information determined according to the channel state information transmission period of the general transmission time interval and the channel state information transmission period of the short transmission time interval from the terminal and based on the received channel state information
  • a control unit for determining downlink data transmission settings and parameters for the terminal, wherein a general transmission time interval is set to 12 or 14 symbols, and a short transmission time interval is set to 2, 4, or 7 symbols.
  • the channel state information transmission period of the short transmission time interval is determined based on the type information of the short transmission time interval.
  • the embodiments described above can provide a concrete method for estimating channel state information and transmitting / receiving estimated channel state information in a short TTI based frame structure.
  • FIG. 1 is a diagram illustrating processing delays and HARQ RTTs in a base station and a terminal.
  • FIG. 2 is a diagram for describing resource mapping per physical resource block (PRB) in one subframe.
  • PRB physical resource block
  • 3 is a diagram for explaining an uplink structure of a legacy PUCCH.
  • FIG. 4 is a view for explaining a configuration diagram of a legacy PUCCH.
  • FIG. 5 is a diagram illustrating a procedure of transmitting channel state information by a terminal in a frame structure of short transmission time intervals according to the present embodiments.
  • FIG. 6 is a diagram illustrating a procedure for a base station to receive channel state information in a frame structure of short transmission time intervals according to the present embodiments.
  • FIG. 7 is a diagram for describing a separation conceptual diagram of a channel state information reporting mode (CSI reporting mode) in a conventional / short transmission time interval.
  • CSI reporting mode channel state information reporting mode
  • FIG. 8 is a diagram illustrating a conceptual diagram of overlapping of a CSI reporting mode in an existing / short transmission time interval.
  • FIG. 9 illustrates a conceptual diagram of an offset-based channel state information reporting mode (CSI reporting mode) in a short transmission time interval.
  • CSI reporting mode channel state information reporting mode
  • FIG. 10 is a diagram for explaining an example of CQI calculation of short transmission time intervals.
  • FIG. 11 is a diagram illustrating a configuration of a base station according to the present embodiments.
  • FIG. 12 is a diagram illustrating a configuration of a user terminal according to the present embodiments.
  • the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement.
  • the MTC terminal may mean a terminal supporting low cost (or low complexity) and coverage enhancement.
  • the MTC terminal may mean a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.
  • the MTC terminal may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC related operations.
  • the MTC terminal supports enhanced coverage compared to the existing LTE coverage, or supports UE category / type defined in the existing 3GPP Release-12 or lower, or newly defined Release-13 low cost (or lower power consumption).
  • low complexity can mean UE category / type.
  • the wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like.
  • the wireless communication system includes a user equipment (UE) and a base station (base station, BS, or eNB).
  • a user terminal is a generic concept meaning a terminal in wireless communication.
  • user equipment (UE) in WCDMA, LTE, and HSPA, as well as mobile station (MS) in GSM, user terminal (UT), and SS It should be interpreted as a concept that includes a subscriber station, a wireless device, and the like.
  • a base station or a cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, an Sector, a Site, and a BTS.
  • Other terms such as a base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell may be called.
  • RRH remote radio head
  • RU radio unit
  • a base station or a cell is a generic meaning indicating some areas or functions covered by a base station controller (BSC) in CDMA, a Node-B in WCDMA, an eNB or a sector (site) in LTE, and the like. It should be interpreted as, and it is meant to cover all the various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, small cell communication range.
  • BSC base station controller
  • the base station may be interpreted in two senses. i) the device providing the megacell, the macrocell, the microcell, the picocell, the femtocell, the small cell in relation to the wireless area, or ii) the wireless area itself. In i) all devices which provide a given wireless area are controlled by the same entity or interact with each other to cooperatively configure the wireless area to direct the base station.
  • the base station may indicate the radio area itself to receive or transmit a signal from the viewpoint of the user terminal or the position of a neighboring base station.
  • megacells macrocells, microcells, picocells, femtocells, small cells, RRHs, antennas, RUs, low power nodes (LPNs), points, eNBs, transmit / receive points, transmit points, and receive points are collectively referred to as base stations. do.
  • the user terminal and the base station are two transmitting and receiving entities used to implement the technology or technical idea described in this specification in a comprehensive sense and are not limited by the terms or words specifically referred to.
  • the user terminal and the base station are two types of uplink or downlink transmitting / receiving subjects used to implement the technology or the technical idea described in the present invention, and are used in a generic sense and are not limited by the terms or words specifically referred to.
  • the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal
  • the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • OFDM-FDMA OFDM-TDMA
  • OFDM-CDMA OFDM-CDMA
  • One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-Advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB.
  • the present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.
  • the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.
  • TDD time division duplex
  • FDD frequency division duplex
  • a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers.
  • the uplink and the downlink include a Physical Downlink Control CHannel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel (PHICH), a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control CHannel (EPDCCH), and the like.
  • Control information is transmitted through the same control channel, and data is configured by a data channel such as a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • control information may also be transmitted using an enhanced PDCCH (EPDCCH or extended PDCCH).
  • EPDCCH enhanced PDCCH
  • extended PDCCH extended PDCCH
  • a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.
  • a wireless communication system to which embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-antenna transmission scheme in which two or more transmission / reception points cooperate to transmit a signal.
  • antenna transmission system a cooperative multi-cell communication system.
  • the CoMP system may include at least two multiple transmission / reception points and terminals.
  • the multiple transmit / receive point is at least one having a base station or a macro cell (hereinafter referred to as an eNB) and a high transmission power or a low transmission power in a macro cell region, which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
  • an eNB a base station or a macro cell
  • a high transmission power or a low transmission power in a macro cell region which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
  • downlink refers to a communication or communication path from a multiple transmission / reception point to a terminal
  • uplink refers to a communication or communication path from a terminal to multiple transmission / reception points.
  • a transmitter may be part of multiple transmission / reception points, and a receiver may be part of a terminal.
  • a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.
  • a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH may be described in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH.
  • a description of transmitting or receiving a PDCCH or transmitting or receiving a signal through the PDCCH may be used as a meaning including transmitting or receiving an EPDCCH or transmitting or receiving a signal through the EPDCCH.
  • the physical downlink control channel described below may mean PDCCH or EPDCCH, and may also be used to include both PDCCH and EPDCCH.
  • the EPDCCH which is an embodiment of the present invention, may be applied to the portion described as the PDCCH, and the PDCCH may be applied to the portion described as the EPDCCH as an embodiment of the present invention.
  • high layer signaling described below includes RRC signaling for transmitting RRC information including an RRC parameter.
  • the eNB performs downlink transmission to the terminals.
  • the eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling required to receive the PDSCH.
  • a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission on a physical uplink shared channel (PUSCH) may be transmitted.
  • PUSCH physical uplink shared channel
  • latency reduction There is ongoing discussion about latency reduction.
  • the main purpose of latency reduction is to standardize the operation of shorter transmission time intervals (hereinafter referred to as 'short TTI' or 'sTTI') to improve TCP throughput.
  • TTI length is one OFDM symbol at 0.5 ms, taking into account the effect on the reference signal and the control signal of the physical layer. lengths between 0.5ms and one OFDM symbol, taking into account impact on reference signals and physical layer control signaling)
  • Latency reduction can be achieved by the following physical layer techniques
  • PDCCH and legacy PDSCH are used for scheduling
  • o UE is expected to receive a sPDSCH at least for downlink unicast
  • ⁇ sPDSCH refers to PDSCH carrying data in a short TTI.
  • o UE is expected to receive PDSCH for downlink unicast
  • PSS / SSS PSS / SSS, PBCH, PCFICH, PRACH, random access, paging, and SIB are not changed.
  • Scheme 1 Multiple short-TTIs in the same subframe share the same DM-RS symbol (Alt.1: DM-RS symbol shared by multiple short-TTIs within the same subframe)
  • Each sPUSCH has a DM-RS (Alt.2: DM-RS contained in each sPUSCH)
  • FIG. 1 is a diagram illustrating processing delays and HARQ RTTs in a base station and a terminal.
  • the delay in the average down-link latency calculation, can be calculated by the following procedure.
  • the unidirectional delay in the user plane of LTE for the scheduled UE may consist of a fixed node processing delay and one TTI duration for transmission as shown in FIG. 1 below.
  • the unidirectional delay can be calculated as follows: Following the same approach as in section B.2.1 in 3GPP TR 36.912, the LTE U-plane one-way latency for a scheduled UE consists of the fixed node processing delays and 1 TTI duration for transmission, as shown in Figure A.1 below.Assuming the processing times can be scaled by the same factor of TTI reduction keeping the same number of HARQ processes, the one way latency can be calculated as)
  • the delay can be calculated as follows: (Considering a typical case where there would be 0 or 1 retransmission, and assuming error probability of the first transmission to be p, the delay is given by)
  • Table 1 discloses the steps for uplink delay and their contributions.
  • the eNB adds an eNB processing delay after receiving the uplink data (step 7) (Assume UE is in connected / synchronized mode and wants to do UL transmission, eg , to send TCP ACK.Following table shows the steps and their corresponding contribution to the UL transmission latency.To be consistent in comparison of DL and UL, we add the eNB processing delay in the UL after the UL data is received by the eNB ( step 7).)
  • step 5 the half delays of steps 1-4 and 5 are assumed to be due to scheduling requests, and the rest are assumed for uplink data transmission (In the table above, steps 1-4 and half delay). of step 5 is assumed to be due to SR, and rest is assumed for UL data transmission in values shown in Table 4)
  • the above resource map represents the existing resource mapping of the PRB in one subframe.
  • the following resource map is a short TTI resource mapping considering a control field consisting of two OFDM symbols to ensure backward compatibility.
  • the loss rate at the PHY layer is assumed to be (L legacy , eg 5%-50%).
  • the resource map above is the legacy resource mapping per PRB in one subframe, considering 2 Antenna ports and 2 OFDM symbols control field.
  • the resource map below is the short TTI resource mapping, considering 2 OFDM symbols used for the control field in order to ensure the backward compatibility.
  • the loss rates (L legacy , eg 5%-50% ) of the PHY layer in short TTI duration are assumed.
  • the loss rate of the PHY layer for the existing PDSCH can be calculated as follows.
  • the loss rate of PHY layer for legacy PDSCH is calculated as follows):
  • the TBS of short TTI PDSCH is calculated as the following table:
  • the UL control channel for transmitting a response to the PDSCH to the base station by the UE is PUCCH.
  • the UE may use the PUCCH format in various formats to deliver Ack / Nack and CQI information for the downlink data channel to the eNB.
  • slot-based PUCCH hopping may be performed as shown in FIG. 3.
  • This PUSCH hopping increases the frequency diversity of the PUCCH and consequently increases the coverage of the PUCCH. This is basically because there is a gain in which diversity can be obtained by transmitting the same signal or one information sequence through different frequency bands.
  • the resource allocation is applied by OCC (spreading) + CS (cyclic shift) based on formats 1a and 1b.
  • the existing PUCCH is set to 3 symbols RS and 4 symbols A / N on a slot basis.
  • the CS-based A / N multiplexing resource allocation of the Zadoff-Chu (ZC) sequence excluding the existing OCC is considered in consideration of the small number of symbols of the sPUCCH.
  • OCC spreading is not used.
  • ZC sequence is basically RS below It may be defined as a cyclic shift value defined in.
  • the PUCCH format 1a / b performs dynamic resource allocation. Basically, the PUCCH format 1a / b performs dynamic allocation based on the scheduled CCE index of the PDCCH.
  • PUCCH resource index for Ack / Nack Is the lowest CCE index of the PDCCH used for transmitting downlink control information (DCI) used for downlink resource allocation. From the upper layer Determined by From here After all, means a kind of shift value set so that the PUCCH format 1a / 1b can be separated from other PUCCH format 2/3/4.
  • DCI downlink control information
  • n + 3 for FS1, 2 and 3 are only supported for UEs that can reduce the HARQ processing time for uplink grants and downlink data for uplink data (For FS1, 2 & 3, a minimum timing).
  • n + 3 is supported for UL grant to UL data and for DL data to DL HARQ for UEs capable of operating with reduced processing time with only the following conditions):
  • New downlink HARQ and uplink scheduling timing relations are defined for FS2 (For FS2, new DL HARQ and UL scheduling timing relations will be defined).
  • o Reduced processing time may be set by the RRC in the terminal (Reduced processing time (s) are RRC configured for the UE).
  • the maximum number of supported layers is 2
  • the maximum number of supported layers is 4
  • the maximum number of supported layers is 8
  • the embodiments described below may be applied to a terminal, a base station, and a core network entity (MME) using all mobile communication technologies.
  • MME core network entity
  • the present embodiments can be applied not only to mobile communication terminals to which LTE technology is applied but also to next generation mobile communication (5G mobile communication, New-RAT) terminals, base stations, and core network entities (AMFs).
  • the base station may refer to an eNB of LTE / E-UTRAN, and a base station (CU, DU, or CU and DU) may be represented in a 5G wireless network in which a central unit (CU) and a distributed unit (DU) are separated.
  • An entity implemented as one logical entity gNB.
  • the general transmission time interval or the existing / legacy time interval described herein means a subframe time interval of 1ms used in the conventional LTE / LTE-Advanced. That is, in the conventional LTE / LTE-Advanced, since the time interval of one subframe is 1ms and may be composed of 14 symbols (for Normal CP) or 12 symbols (for Extended CP), the time interval is 14 symbols or 12 It can be a symbol. Therefore, in the following embodiments, expressing the existing or general may mean a conventional LTE / LTE-Advanced system having a subframe of 1 ms.
  • the type of the short transmission time interval described herein is to distinguish the symbol length of the TTI in the short transmission time interval, specifically, the symbol length means the number of symbols constituting one short transmission time interval. .
  • channel state information is a concept including both CQI / PMI / RI.
  • CQI channel state information
  • the existing CQI Reporting period may be determined by Equation 3 below.
  • n f means a system frame number (SFN)
  • n s means a slot number in a radio frame
  • N OFFSET a system frame number
  • CQI means an offset with respect to a period for reporting the CQI in the subframe
  • N pd indicates a period for reporting the CQI in the subframe.
  • CQI May be determined by a CQI-PMI configuration index parameter (I CQI / PMI ).
  • Equation 4 shows a period in which the CQI and the RI are transmitted simultaneously.
  • the specific value of this parameter is transmitted as an RRC signal ( CQI - ReportConfig message ), and in general, it can be seen that the period in which the CQI is transmitted is a subframe. Unlike CQI only reporting It can be seen that is the transmission period.
  • n f means a system frame number (SFN)
  • n s means a slot number in a radio frame
  • N OFFSET .
  • CQI means an offset with respect to a period for reporting the CQI in the subframe
  • N pd indicates a period for reporting the CQI in the subframe
  • RI means an offset with respect to a period for reporting RI in a subframe
  • M RI indicates a number of RI reporting periods multiplied to be a multiple of a CQI reporting period.
  • M RI and N OFFSET .RI may be determined by a RI configuration index parameter (I RI ).
  • the present invention describes an additional CSI reporting method for a short transmission time interval (sTTI) that can operate separately from the existing CSI reporting.
  • sTTI does not modify existing CRS, PCFICH, PDCCH, PBCH, PRACH, etc., but assumes that it operates by overlaying on an existing area or multiplexing some areas.
  • sPUCCH and other existing A / N as well as additional CSI reporting in mind. Therefore, the present invention proposes that an additional operation for conventional CQI estimation is required.
  • FIG. 5 is a diagram illustrating a procedure of transmitting channel state information by a terminal in a frame structure of short transmission time intervals according to the present embodiments.
  • the terminal may receive type information of a short transmission time interval through RRC signaling to the base station (S500).
  • parameters relating to a CQI reporting period may be delivered in a CQI-ReportConfig message.
  • the terminal may determine the channel state information transmission period of the short transmission time interval based on the received type information of the short transmission time interval (S510). As described above, the number of symbols constituting one transmission time interval may vary according to the type of the short transmission time interval.
  • the channel state information transmission period of the short transmission time interval may be determined by a function that takes as a parameter the type information of the short transmission time interval received from the base station.
  • the terminal may determine the channel state information to be transmitted to the base station according to the channel state information transmission period of the general transmission time interval and the channel state information transmission period of the short transmission time interval (S520).
  • the channel state information may occur when the channel state information transmission time point of the general transmission time interval and the channel state information transmission time point of the short transmission time interval overlap.
  • the terminal may determine the channel state information value to be transmitted to the base station as one.
  • one of channel state information of a general transmission time interval or channel state information of a short transmission time interval may be selected and transmitted to the base station.
  • one of average value / maximum value / minimum value of channel state information of a general transmission time interval and channel state information of a short transmission time interval may be selected and transmitted to the base station.
  • the channel state information may be an offset value between channel state information of a general transmission time interval and channel state information of a short transmission time interval.
  • the channel state information is transmitted through the sPUCCH. Since the number of symbols of the sPUCCH is limited, it is necessary to save the number of bits. Therefore, only an offset value may be transmitted through sPUCCH based on channel state information of a general transmission time interval that the UE already has. In this case, only an offset value of 3 bits or 2 bits can be transmitted to the base station.
  • the offset value may be derived by channel estimation for each port of the CRS in units of symbols or slots corresponding to the length of a short transmission time interval.
  • the offset value may be derived by channel estimation for each port of the DM-RS in units of symbols or slots corresponding to the length of a short transmission time interval.
  • additional channel estimation may be performed using the corresponding RS.
  • the terminal may transmit the channel state information to be transmitted to the base station through the uplink control channel of a short transmission time interval (S530).
  • S530 short transmission time interval
  • the general transmission time interval may be set to 1 ms subframe, that is, 12 or 14 symbols, and the short transmission time interval may be set to 2, 4, or 7 symbols.
  • 12 or 14 symbols are the number of symbols constituting one subframe in the normal CP / Extended CP, respectively, in the normal transmission time interval, and 2/4/7 are currently considered by the sTTI.
  • the number of symbols constituting one TTI may be set to 1 ms subframe, that is, 12 or 14 symbols, and the short transmission time interval may be set to 2, 4, or 7 symbols.
  • FIG. 6 is a diagram illustrating a procedure for a base station to receive channel state information in a frame structure of short transmission time intervals according to the present embodiments.
  • the base station may transmit the type information of the short transmission time interval to the terminal through the RRC signaling (S600).
  • parameters relating to a CQI reporting period may be delivered in a CQI-ReportConfig message.
  • the base station may receive channel state information determined according to the channel state information transmission period of the general transmission time interval and the channel state information transmission period of the short transmission time interval from the terminal (S610).
  • the terminal may determine the channel state information to be transmitted to the base station according to the channel state information transmission period of the general transmission time interval and the channel state information transmission period of the short transmission time interval.
  • the received channel state information is determined by type information of a short transmission time interval
  • the general transmission time interval is set to 1 ms subframe, that is, 12 or 14 symbols
  • the short transmission time interval is two or It can be set to four or seven symbols.
  • 12 or 14 symbols are the number of symbols constituting one subframe in the normal CP / Extended CP, respectively, in the normal transmission time interval, and 2/4/7 are currently considered by the sTTI. The number of symbols constituting one TTI.
  • the channel state information may occur, for example, when the channel state information transmission time of the general transmission time interval and the channel state information transmission time of the short transmission time interval overlap.
  • the terminal since the values of the two channel state information may be different from each other, the terminal may determine the channel state information value to be transmitted to the base station as one.
  • the channel state information transmitted by the terminal to the base station may be determined as one of the channel state information of the general transmission time interval or the channel state information of the short transmission time interval, or the channel state information of the general transmission time interval and the short transmission time
  • the average value / maximum value / minimum value of the channel state information of the interval may be determined.
  • the channel state information may be an offset value between channel state information of a general transmission time interval and channel state information of a short transmission time interval.
  • the offset value may be derived by channel estimation for each port of the CRS in units of symbols or slots corresponding to the length of a short transmission time interval.
  • the offset value may be derived by channel estimation for each port of the DM-RS in units of symbols or slots corresponding to the length of a short transmission time interval.
  • additional channel estimation may be performed using the corresponding RS.
  • the base station may determine the downlink data transmission settings and parameters for the terminal based on the received channel state information (S620).
  • Example 1 Report general channel status information mode Apart from Legacy CSI reporting mode sTTI New channel status information for reports mode (CSI reporting mode) introduced
  • CSI reporting mode for performing channel state information reporting (CSI reporting) of a subframe or less than a general channel state reporting mode (CSI reporting mode) is not provided. Applicable That is, unlike conventional CSI reporting, reporting can be performed by a specific symbol unit.
  • i 0, 1, 2, and is converted into a symbol length according to the sTTI type.
  • the length of the symbol means the number of symbols constituting one sTTI.
  • the channel state reporting period in the sTTI may be determined by the following equation (5).
  • n f means a system frame number (SFN)
  • n s means a slot number in a radio frame
  • N OFFSET a system frame number (SFN)
  • CQI refers to an offset with respect to a period for reporting the CQI in a subframe
  • N pd, i indicates a CQI reporting period determined according to the type in the sTTI.
  • the entire unit may be converted into an index of the subframe / subframe of the sTTI.
  • Example 2 Legacy CSI reporting and at sTTI Report channel status information ( sTTI If CSI reporting overlaps, select one mode first
  • the UE behavior is defined when the CSI reporting mode is overlapped.
  • FIG. 8 illustrates a region in which channel state information reporting modes (CSI reporting mode) overlap each other in a conventional / short transmission time interval.
  • CSI reporting channel state information reporting
  • the terminal when two channel state information reporting (CSI reporting) is performed at the same time, it is common for the terminal to simultaneously perform the corresponding process without a right to select the channel state information reporting (CSI reporting).
  • the following embodiment is described on the assumption that the UE simultaneously performs two CSI reporting. However, if the UE can select the CSI value to be reported when the CSI reporting is overlapped, two CSI values may be combined into one value or one reporting may be omitted.
  • Example 2-1 Legacy CSI reporting at sTTI Report channel status information ( sTTI General channel state information when CSI reporting is overlapped The legacy CSI reporting use
  • the terminal may unconditionally select the general channel state information report value as the channel state information value to be reported to the base station.
  • Example 2-2 Legacy CSI reporting at sTTI Report channel status information ( sTTI CSI reporting overlaps at sTTI Channel Status Information STTI CSI reporting use
  • the UE may select the sTTI channel state information report value unconditionally as the channel state information value to report to the base station when each channel state information report mode overlaps.
  • Example 2-3 Legacy CSI reporting at sTTI Use CSI averages when channel status information (sTTI CSI reporting) overlaps
  • the terminal may calculate an average value of the general channel state information report value and the sTTI channel state information report value when each channel state information report mode overlaps, and select the average value as the channel state information value to report to the base station.
  • Example 2-4 Legacy CSI reporting at sTTI Use CSI max values when channel status information (sTTI CSI reporting) overlaps
  • the UE may select the largest value as the channel state information value to be reported to the base station by comparing the size of the general channel state information report value and the size of the sTTI channel state information report value when each channel state information report mode overlaps. .
  • Example 2-5 Legacy CSI reporting at sTTI Use CSI minimum values when channel status information (sTTI CSI reporting) overlaps
  • the UE may select the smallest value as the channel state information value to be reported to the base station by comparing the size of the general channel state information report value and the size of the sTTI channel state information report value when each channel state information report mode overlaps. .
  • Example 3 at sTTI Report channel status information ( sTTI CSI reporting delivers only an offset from the legacy CSI reporting value.
  • Channel state information reporting (CSI reporting) in the sTTI is made for the sPUCCH.
  • the sPUCCH does not exist in an area capable of delivering a maximum of 11 bits of CSI as in the past due to the limitation of the number of symbols. Therefore, when performing CSI reporting other than A / N on sPUCCH, it is advantageous to perform with a minimum bit.
  • the sTTI CQI can briefly derive an offset value based on the value of the existing channel quality reporting (CQI reporting). In this case, it is assumed that general channel state reporting (CSI reporting) is normally performed.
  • FIG. 9 illustrates a conceptual diagram of an offset-based channel state information reporting mode (CSI reporting mode) in a short transmission time interval.
  • the existing 3-bit offset table can be reused. If it is 2 bits, the offset value can be set as shown in Table 7. Therefore, it is possible to save the number of bits used as compared to using an area capable of delivering up to 11 bits of CSI, as in the conventional PUCCH.
  • Example 3-1 sTTI Channel Quality Indication Offset ( CQI offset) Channel estimation for each port of the existing CRS by symbol or slot corresponding to the sTTI length for derivation
  • CQI offset Channel Quality Indication Offset
  • the operation of the terminal capable of channel estimation based on the legacy reference signal is further defined.
  • the method of estimating CSI can reuse existing procedures as they are.
  • a reference signal received quality (RSSRQ) value can be derived based on RSRP (Reference Signal Received Power), RSSI (Received Signal Strength Indicator) in symbol unit or slot unit, and CQI can be derived based on this.
  • the unit of the CQI derivation may include not more than a few tens of subframes but also subunits or less.
  • FIG. 10 is a diagram for explaining an example of CQI calculation considering the transmission time interval of sTTI.
  • Example 3-2 sTTI Channel Quality Indication Offset ( CQI offset) each port of the existing DMRS sTTI According to length symbol Or estimate channel by slot
  • the method of estimating CSI can reuse existing procedures as they are.
  • a reference signal received quality (RSSRQ) value can be derived based on RSRP (Reference Signal Received Power), RSSI (Received Signal Strength Indicator) in symbol unit or slot unit, and CQI can be derived based on this.
  • RSRP Reference Signal Received Power
  • RSSI Received Signal Strength Indicator
  • CQI Received Signal Strength Indicator
  • the unit of the CQI derivation may include not more than a few tens of subframes but also subunits or less.
  • Example 3-3 sTTI Channel Quality Indication Offset ( CQI to derive the downlink data channel of short transmission time interval sPDSCH ) RS Channel Estimation with Downlink Control Channel (sPDCCH RS) / DMRS with Short Transmission Time Interval
  • a new additional DMRS may be considered for the sPDCCH / sPDSCH currently transmitted to each sTTI. If a new short DMRS for sTTI is defined, additional channel estimation is possible using that RS. For example, an offset value for CQI can be derived through channel estimation for such a short DMRS.
  • FIG. 11 is a diagram illustrating a configuration of a base station according to the present embodiments.
  • the base station 1100 includes a receiver 1110, a controller 1120, and a transmitter 1130.
  • the controller 1120 controls the overall operation of the base station 1100 according to the reception of the channel state information in the frame structure of the short transmission time interval according to the present invention described above.
  • downlink data transmission setting and parameters for the terminal are determined based on the channel state information received from the terminal.
  • the receiver 1110 and the transmitter 1130 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention.
  • the receiver 1110 receives channel state information determined according to the channel state information transmission period of the general transmission time interval and the channel state information transmission period of the short transmission time interval from the terminal.
  • the general transmission time interval is set to 12 or 14 symbols
  • the short transmission time interval is set to 2, 4 or 7 symbols
  • the channel state information transmission period of the short transmission time interval May be determined based on the type information of the short transmission time interval transmitted by the base station to the terminal.
  • the channel state information may include the channel state information of the general transmission time interval or the short transmission time interval when the transmission state of the channel state information of the general transmission time interval and the transmission time of the channel state information of the short transmission time interval overlap.
  • the channel state information may be an offset value between channel state information of a general transmission time interval and channel state information of a short transmission time interval.
  • the offset value may be derived by channel estimation for each port of the CRS in units of symbols or slots corresponding to the length of a short transmission time interval.
  • the offset value may be derived by channel estimation for each port of the DM-RS in units of symbols or slots corresponding to the length of a short transmission time interval.
  • the transmitter 1130 transmits type information of a short transmission time interval to the terminal through RRC signaling.
  • FIG. 12 is a diagram illustrating a configuration of a user terminal according to the present embodiments.
  • the user terminal 1200 includes a receiver 1210, a controller 1220, and a transmitter 1230.
  • the receiver 1210 receives downlink control information, data, and a message from a base station through a corresponding channel.
  • the receiver 1210 receives type information of a short transmission time interval from the base station through RRC signaling.
  • controller 1220 controls the overall operation of the user terminal 1200 according to the transmission of the channel state information in the frame structure of the short transmission time interval according to the above-described present invention.
  • the controller 1220 determines the channel state information transmission period of the short transmission time interval based on the type information of the short transmission time interval received from the base station, and the channel state information transmission period and the short transmission time interval of the general time interval.
  • the channel state information to be transmitted to the base station is determined according to the channel state information transmission period of the base station.
  • the general transmission time interval may be set to 12 or 14 symbols
  • the short transmission time interval may be set to 2, 4, or 7 symbols.
  • the channel state information transmission period of the short transmission time interval may be determined by a function that takes as a parameter the type information of the short transmission time interval received from the base station.
  • the channel state information may include the channel state information of the general transmission time interval or the short transmission time interval when the transmission state of the channel state information of the general transmission time interval and the transmission time of the channel state information of the short transmission time interval overlap.
  • the channel state information may be an offset value between channel state information of a general transmission time interval and channel state information of a short transmission time interval.
  • the offset value may be derived by channel estimation for each port of the CRS in units of symbols or slots corresponding to the length of a short transmission time interval.
  • the offset value may be derived by channel estimation for each port of the DM-RS in units of symbols or slots corresponding to the length of a short transmission time interval.
  • the transmitter 1230 transmits uplink control information, data, and messages to the base station through a corresponding channel.
  • the present invention proposes a short TTI based CQI estimation method and a transmission method in a 3GPP LTE / LTE-Advanced system.
  • the method and process of sTTI-based CQI estimation have been described.
  • the method can be applied to similar signals and channels as it is, and the application thereof is not limited only to the sTTI frame structure.

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

Abstract

La présente invention concerne l'exploitation d'un terminal et d'une station de base pour la transmission et la réception d'informations d'état de canal dans une structure de trame d'un intervalle de temps de transmission court d'un système 3GPP LTE/LTE avancé. Dans un mode de réalisation, l'invention concerne un procédé et un appareil pour la transmission, par un terminal, d'informations d'état de canal (CSI) dans une structure de trame d'un intervalle de temps de transmission court (sTTI), le procédé comprenant : la réception d'informations de type d'un intervalle de temps de transmission court en provenance d'une station de base par l'intermédiaire d'une signalisation RRC ; la détermination d'une période de transmission d'informations d'état de canal d'un intervalle de temps de transmission court en fonction des informations de type de l'intervalle de temps de transmission court ; la détermination d'informations d'état de canal à transmettre à la station de base en fonction d'une période de transmission d'informations d'état de canal d'un intervalle de temps de transmission général et de la période de transmission d'informations d'état de canal de l'intervalle de temps de transmission court ; et la transmission des informations d'état de canal à transmettre à la station de base par l'intermédiaire d'un canal de commande de liaison montante d'un intervalle de temps de transmission court, l'intervalle de temps de transmission général étant réglé à 12 ou 14 symboles et l'intervalle de temps de transmission court étant réglé à 2, 4 ou 7 symboles.
PCT/KR2017/010496 2016-09-23 2017-09-22 Procédé et appareil de transmission d'informations d'état de canal dans une structure de trame d'un intervalle de temps de transmission court WO2018056760A1 (fr)

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CN201780058930.4A CN109792315B (zh) 2016-09-23 2017-09-22 用于在短tti的帧结构中传送信道状态信息的方法和装置
US16/335,717 US10849111B2 (en) 2016-09-23 2017-09-22 Method and apparatus for transmitting channel state information in frame structure of short transmission time interval

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KR10-2016-0122509 2016-09-23
KR20160122509 2016-09-23
KR10-2017-0118923 2017-09-15
KR1020170118923A KR102186397B1 (ko) 2016-09-23 2017-09-15 짧은 전송 시간 간격의 프레임 구조에서 채널 상태 정보를 전송하는 방법 및 장치

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