WO2020091556A1 - Procédé et appareil pour la commande automatique de gain dans un système véhicule-à-tout - Google Patents

Procédé et appareil pour la commande automatique de gain dans un système véhicule-à-tout Download PDF

Info

Publication number
WO2020091556A1
WO2020091556A1 PCT/KR2019/014826 KR2019014826W WO2020091556A1 WO 2020091556 A1 WO2020091556 A1 WO 2020091556A1 KR 2019014826 W KR2019014826 W KR 2019014826W WO 2020091556 A1 WO2020091556 A1 WO 2020091556A1
Authority
WO
WIPO (PCT)
Prior art keywords
slot
symbol
preamble
dmrs
agc
Prior art date
Application number
PCT/KR2019/014826
Other languages
English (en)
Inventor
Cheolkyu SHIN
Jeongho Yeo
Hyunseok Ryu
Jinyoung Oh
Original Assignee
Samsung Electronics Co., Ltd.
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.)
Filing date
Publication date
Priority claimed from KR1020190099607A external-priority patent/KR102662626B1/ko
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Priority to CN201980073177.5A priority Critical patent/CN112970223A/zh
Priority to ES19878362T priority patent/ES2966505T3/es
Priority to EP19878362.3A priority patent/EP3857806B1/fr
Publication of WO2020091556A1 publication Critical patent/WO2020091556A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • H03G3/3078—Circuits generating control signals for digitally modulated signals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3089—Control of digital or coded signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H04L27/3809—Amplitude regulation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G2201/00—Indexing scheme relating to subclass H03G
    • H03G2201/30—Gain control characterized by the type of controlled signal
    • H03G2201/307—Gain control characterized by the type of controlled signal being radio frequency signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

Definitions

  • the disclosure relates generally to a mobile communication system and, more particularly, to a method and apparatus for more efficiently performing automatic gain control (AGC) and data signal reception by a terminal (i.e., user equipment (UE)) supporting vehicle-to-everything (V2X) communication.
  • AGC automatic gain control
  • UE user equipment
  • V2X vehicle-to-everything
  • the 5G or pre-5G communication system is also called a 'Beyond 4G Network' or a 'Post LTE System'.
  • the 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60GHz bands, so as to accomplish higher data rates.
  • mmWave e.g., 60GHz bands
  • MIMO massive multiple-input multiple-output
  • FD-MIMO Full Dimensional MIMO
  • array antenna an analog beam forming, large scale antenna techniques are discussed in 5G communication systems.
  • RANs Cloud Radio Access Networks
  • D2D device-to-device
  • CoMP Coordinated Multi-Points
  • FQAM Hybrid FSK and QAM Modulation
  • SWSC sliding window superposition coding
  • ACM advanced coding modulation
  • FBMC filter bank multi carrier
  • NOMA non-orthogonal multiple access
  • SCMA sparse code multiple access
  • the Internet which is a human centered connectivity network where humans generate and consume information
  • IoT Internet of Things
  • IoE Internet of Everything
  • sensing technology “wired/wireless communication and network infrastructure”, “service interface technology”, and “Security technology”
  • M2M Machine-to-Machine
  • MTC Machine Type Communication
  • IoT Internet technology services
  • IoT may be applied to a variety of fields including smart home, smart building, smart city, smart car or connected cars, smart grid, health care, smart appliances and advanced medical services through convergence and combination between existing Information Technology (IT) and various industrial applications.
  • IT Information Technology
  • 5G communication systems to IoT networks.
  • technologies such as a sensor network, Machine Type Communication (MTC), and Machine-to-Machine (M2M) communication may be implemented by beamforming, MIMO, and array antennas.
  • MTC Machine Type Communication
  • M2M Machine-to-Machine
  • Application of a cloud Radio Access Network (RAN) as the above-described Big Data processing technology may also be considered to be as an example of convergence between the 5G technology and the IoT technology.
  • RAN Radio Access Network
  • An aspect of the disclosure is to provide a method and apparatus for effectively performing AGC for control and data signal reception by a UE supporting V2X in an environment in which a variety of numerologies are supported.
  • Another aspect of the disclosure is to provide a configuration of a base station (gNB) for a terminal (i.e., a UE) that performs AGC and the operation of the UE.
  • gNB base station
  • a terminal i.e., a UE
  • a method by a first terminal in a wireless communication system includes determining whether to transmit a preamble for an AGC; determining a slot and at least one symbol in the slot to transmit the preamble for the AGC, in a case in which it is determined to transmit the preamble for the AGC; and transmitting, to a second terminal, the preamble for the AGC in the determined slot and the at least one symbol in the slot.
  • a method by a second terminal in a wireless communication system includes determining whether to receive a preamble for an AGC; monitoring a slot and at least one symbol in the slot to receive the preamble for AGC, in a case in which it is determined to receive the preamble for the AGC; and receiving, from a first terminal, the preamble for the AGC in the slot and the at least one symbol in the slot, wherein the slot and the at least one symbol in the slot to receive the preamble for AGC is determined by the first terminal, in a case in which it is determined by the first terminal to transmit the preamble for the AGC.
  • a first terminal in a wireless communication system includes a transceiver configured to communicate with other network entities; and a controller configured to determine whether to transmit a preamble for an AGC, determine a slot and at least one symbol in the slot to transmit the preamble for the AGC, in a case in which it is determined to transmit the preamble for the AGC, and transmit, to a second terminal, the preamble for the AGC in the determined slot and the at least one symbol in the slot.
  • a second terminal in a wireless communication system includes a transceiver configured to communicate with other network entities; and a controller configured to determine whether to receive a preamble for an AGC, monitor a slot and at least one symbol in the slot to receive the preamble for the AGC, in a case in which it is determined to receive the preamble for the AGC, and receive, from a first terminal, the preamble for the AGC in the slot and the at least one symbol in the slot, wherein the slot and the at least one symbol in the slot to receive the preamble for AGC is determined by the first terminal, in a case in which it is determined by the first terminal to transmit the preamble for the AGC.
  • FIG. 1A is a diagram illustrating V2X communication in a cellular system, according to an embodiment
  • FIG. 1B is a diagram illustrating a demodulation reference signal (DMRS) pattern considered for V2X, according to an embodiment
  • FIG. 1C is a diagram illustrating two methods of allocating physical sidelink control channel (PSCCH) and PSSCH by frequency division multiplexing (FDM), according to an embodiment
  • FIG. 1D is a diagram illustrating DMRS patterns (type1 and type2) used for communication between a next generation NodeB (gNB) and a user equipment (UE) in a new radio (NR) system, according to an embodiment;
  • gNB next generation NodeB
  • UE user equipment
  • NR new radio
  • FIG. 1E is a diagram illustrating a partial structure of a receiver of a UE for performing AGC, according to an embodiment
  • FIG. 1F is a diagram illustrating an example of the strength of a signal passing through an amplifier when AGC is performed, if orthogonal frequency division multiplexing (OFDM) symbols are received over time, according to an embodiment
  • FIG. 1G is a diagram illustrating a performance degradation according to an ACG determination time for a short symbol length in accordance with support of a wide-length subcarrier spacing, according to an embodiment
  • FIG. 1H is a diagram illustrating a first method and a second method, according to an embodiment
  • FIG. 1I is a diagram illustrating the operation of a UE in accordance with a first method, according to an embodiment
  • FIG. 1J is a diagram illustrating the operation of a UE in accordance with a second method, according to an embodiment
  • FIG. 1K is a diagram illustrating a DMRS position when the symbol length of a scheduled PSSCH is 7 and when the number of additional DMRSs is configured to one, according to an embodiment
  • FIG. 1L is a block diagram illustrating an internal structure of a UE, according to an embodiment.
  • FIG. 1M is a block diagram illustrating an internal structure of a gNB, according to an embodiment.
  • FIG. 2 illustrates a case in which four subchannels are allocated to a PSSCH starting from a third subchannel.
  • FIG. 3A to 3E illustrates a transmission position of the PSCCH in the sidelink.
  • connection nodes terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, and terms referring to various types of identification information which are used in the following description are illustrated for convenience of description. Therefore, the disclosure may not be limited by the terminologies provided below, and other terms that indicate subjects having equivalent technical meanings may be used.
  • the disclosure uses terms and names defined in a 3rd Generation Partnership Project LTE (3GPP LTE).
  • 3GPP LTE 3rd Generation Partnership Project LTE
  • the disclosure is not limited to the above terms and names, and may be equally applied to systems conforming to other standards such as 3GPP NR.
  • FIG. 1A is a diagram illustrating V2X communication in a cellular system, according to an embodiment.
  • V2X collectively refers to communication technology through all interfaces with vehicles, and includes vehicle-to-vehicle (V2V), vehicle-to-infra-structure (V2I), and vehicle-to-pedestrian (V2P), depending on its shape and the components consisting of communication.
  • V2P and V2V fundamentally follow the structure and operation principle of Rel-13 device-to-device (D2D).
  • a gNB a-01 includes at least one vehicle UE a-05, a-10, a-11, and a12 positioned in a cell a-02 supporting V2X and a pedestrian portable UE a-15. That is, the vehicle UE a-05 performs cellular communication with the gNB a-01 using vehicle UE-to-gNB links Uu a-30 and a-35, and performs D2D communication with the other vehicle UEs a-10, a-11, and a-12 or the pedestrian portable UE a-15 using sidelinks (PC5) a-20, a-21, a-22, and a-25.
  • the gNB has to allocate a resource pool that can be used for sidelink communication.
  • resource allocation may be divided into two types, a scheduled resource allocation (mode 3) and an UE autonomous resource allocation (mode 4) according to a method for a gNB to allocate resources to a UE for V2X sidelink communication.
  • a gNB allocates resources used for sidelink transmission to radio resource control (RRC)-connected UEs in a dedicated scheduling manner.
  • RRC radio resource control
  • the above method is effective for interference management and resource pool management (dynamic allocation and semi-persistence transmission) because the gNB can manage the resources of the sidelink.
  • the data when the RRC-connected UE has data to be transmitted to other UEs, the data may be transmitted to the gNB using an RRC message or a medium access control (MAC) control element (CE).
  • MAC medium access control
  • SidelinkUEInformation and UEAssistanceInformation messages may be used as the RRC message.
  • the MAC CE may be, for example, a buffer status report MAC CE in a new format (including at least an indicator indicating that the corresponding report is a buffer status report for V2P communication and information on the size of data buffered for D2D communication).
  • a gNB provides a sidelink transmission/reception resource pool for V2X as system information and a UE selects a resource pool according to a predetermined rule.
  • the resource selection method may include zone mapping or sensing-based resource selection and random selection.
  • FIG. 1B is a diagram illustrating a DMRS pattern considered for V2X, according to an embodiment.
  • V2X is a vehicle-to-vehicle communication
  • UE reception performance has to be guaranteed, even in a high-speed mobile environment.
  • FIG. 1B in an LTE system, four DMRSs are assigned to symbol indexes ⁇ 2,5,8,11 ⁇ for a PSCCH and a physical sidelink shared channel (PSSCH), and three DMRSs except for symbols for a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS) are assigned to symbol indexes ⁇ 5,7,10 ⁇ for a physical sidelink broadcast channel (PSBCH).
  • PSSS primary sidelink synchronization signal
  • SSSS secondary sidelink synchronization signal
  • a DMRS structure is designed in consideration of the channel estimation performance and frequency offset estimation performance of a sidelink by reducing the spacing of DMRS symbols as much as possible.
  • V2X service exchanges information related to vehicle safety
  • the delay time of transmission and reception should be minimized to the extent that it can guarantee safety between vehicles.
  • a frequency division multiplexing (FDM) method of simultaneously transmitting data channels and control channels in different frequency domains in the same subframe is used. Therefore, the delay time can be reduced by simultaneously receiving the data channel and the control channel to process them at the same time.
  • FIG. 1C is a diagram illustrating two methods of allocating PSCCH and PSSCH by FDM, according to an embodiment.
  • c-10 indicates a non-adjacent allocation scheme that separates PSCCH and PSSCH allocation resource regions in one subframe to support the transmission and reception of multiple V2X UEs.
  • c-20 indicates an adjacent allocation scheme that continuously assigns PSCCH and PSSCH to one subchannel to support the transmission and reception of multiple V2X UEs.
  • FIG. 1D is a diagram illustrating DMRS patterns (type 1 and type 2) used for communication between a gNB and a UE in an NR system, according to an embodiment.
  • d-10 and d-20 represent DMRS type 1, wherein d-10 represents a one-symbol pattern and d-20 represents a two-symbol pattern.
  • DMRS type 1 of d-10 or d-20 is a DMRS pattern of a comb 2 structure and may be composed of two code division multiplexing (CDM) groups, and different CDM groups are subjected to FDM. Specifically, in d-10 and d-20, each of portions marked in green represents CDM group 0 and each of the portions marked in red represents CDM group 1.
  • two DMRS ports can be distinguished by applying CDM in a frequency to the same CDM group, wherein a total of four orthogonal DMRS ports can be configured.
  • DMRS port identifications (IDs) respectively mapped to the CDM groups are illustrated in d-10 (in the case of downlink, the DMRS port ID is indicated by being +1000 to the illustrated number).
  • DMRS port IDs respectively mapped to the CDM groups are illustrated in d-20 (in the case of downlink, the DMRS port ID is indicated by being +1000 to the illustrated number).
  • DMRS type 2 of d-30 or d-40 is a DMRS pattern of a structure in which FD-OCC(Frequency division-Orthogonal Cover Code) is applied to adjacent subcarriers in a frequency and may be composed of three CDM groups, and different CDM groups are subjected to FDM. Specifically, in d-20 and d-30, each portion marked in blue represents CDM group 0, each portion marked in green represents CDM group 1, and each portion marked in red represents CDM group 2.
  • two DMRS ports can be distinguished by applying CDM in frequency to the same CDM group, wherein a total of six orthogonal DMRS ports can be configured.
  • DMRS port IDs respectively mapped to the CDM groups are illustrated in d-30 (in the case of downlink, the DMRS port ID is indicated by being +1000 to the illustrated number).
  • DMRS port IDs respectively mapped to the CDM groups are illustrated in d-40 (in the case of downlink, the DMRS port ID is indicated by being +1000 to the illustrated number).
  • two different DMRS patterns (d-10 and d-20 or d-30 and d-40) may be configured, and whether the DMRS pattern is the one-symbol pattern (d-10 and d-30) or the adjacent two-symbol pattern (d-20 and d-40) can also be configured.
  • a gNB may not only schedule a DMRS port number but also configure and signal the number of CDM groups scheduled together for physical downlink shared channel (PDSCH) rate matching.
  • PDSCH physical downlink shared channel
  • both the above-described two DMRS patterns are supported in downlink (DL) and uplink (UL), and in case of DFT-S-OFDM(Discrete Fourier Transform-Spread-OFDM), only DMRS type 1 is supported among the above-described DMRS patterns in UL.
  • An additional DMRS is supported to be configurable.
  • a front-loaded DMRS refers to a first DMRS that appears in the frontmost (i.e., earliest) symbol in time
  • the additional DMRS refers to a DMRS that appears in a symbol after the front-loaded DMRS.
  • the number of additional DMRSs can be configured from a minimum of zero to a maximum of three.
  • the same pattern as the front-loaded DMRS is assumed when an additional DMRS is configured.
  • the additional DMRS is configured in the same manner as the front-loaded DMRS.
  • the vehicle UE a-05 when the vehicle UE a-05 performs D2D communication with the other vehicle UEs a-10, a-11, and a-12 or the pedestrian portable UE a-15 using the sidelinks (PC5) a-20, a-21, a-22, and a-25, as described above with reference to FIG. 1A, the vehicle UE a-05 was only supported in the form of simultaneously transmitting data to a plurality of unspecific nodes a-10, a-11, a-12, and a-15 through a broadcast.
  • sidelinks PC5
  • support can be considered in the form in which the vehicle UE a-05 transmits data to only one specific node through unicast or transmits data to a plurality of specific nodes through groupcast.
  • a unicast and groupcast technique can be usefully used in consideration of service scenarios such as platooning, which is a technology in which two or more vehicles are connected via one network and bundled and moved in a cluster.
  • unicast communication may be required for the purpose of controlling a specific node by a leader node of a group connected by platooning
  • groupcast communication may be required for the purpose of simultaneously controlling a group constituting of a plurality of specific nodes.
  • a relative speed between nodes is very small in platooning, it may be inefficient to determine the DMRS pattern of the sidelink by reducing the spacing of the DMRS symbols as much as possible only in consideration of the high-speed mobile environment of the V2X as in the LTE system.
  • Table 1 shows various numerologies defined in the NR system.
  • a subcarrier spacing is determined according to numerology ⁇ , and a supported cyclic prefix (CP) length is determined.
  • Table 1 shows OFDM symbols and CP lengths according to the numerology.
  • Tables 2 and 3 show the number of OFDM symbols per slot, the number of slots per frame, and the number of slots per subframe in a normal CP and an extended CP, respectively.
  • type A and type B are defined as PDSCH or PUSCH mapping types.
  • PDSCH or PUSCH mapping type A a first symbol of DMRS symbols is positioned in a second or third OFDM symbol of a slot
  • PDSCH or PUSCH mapping type B a first symbol of DMRS symbols is positioned in a first OFDM symbol of a time domain resource allocated for PUSCH transmission.
  • time domain resource assignment may be transmitted by information about a slot in which data is transmitted and a start symbol position S in the corresponding slot and the number of symbols L to which data is mapped.
  • S may be a relative position from the beginning of the slot
  • L may be the number of consecutive symbols
  • S and L may be determined from a start and length indicator value (SLIV) defined as follows.
  • RRC configuration may allow a UE to receive a configuration of a table including, in one row, an SLIV value, a PDSCH or PUSCH mapping type, and information on a slot in which a PDSCH or PUSCH is transmitted. Thereafter, a gNB indicates an index value in the configured table for the purpose of time domain resource allocation of the DCI, so that the gNB can transmit, to the UE, the SLIV value, the PDSCH or PUSCH mapping type, and the information on a slot for the PDSCH or PUSCH.
  • a problem of AGC in a V2X communication environment is described in consideration of the various numerologies defined in the above-described NR system and a time domain resource allocation method for data transmission.
  • the UE performs, when receiving a signal, an operation of amplifying the received signal. Determining how much the signal is amplified in the amplification operation may depend on the strength of the signal and the dynamic range of a UE amplifier.
  • the dynamic range is a range of the signal strength in which the input and output of the amplifier have a linear relationship. If the input and output of the amplifier do not have the linear relationship and the phase of the signal is arbitrarily changed, the corresponding signal may not be available for data reception. However, if the intensity of amplification is too large, the signal is not amplified by more than a predetermined intensity and the phase of the signal is arbitrarily changed, and therefore the UE may not arbitrarily amplify the received signal. Also, if the intensity of the amplification is too small, there may be a degradation of data reception performance. Accordingly, the UE needs to amplify the received signal with an appropriate strength.
  • the UE when the UE performs amplification, it may be important to find out the strength of the received signal first. For example, this may be to perform an operation of decreasing the amplification degree when the strength of the received signal is too large and increasing the amplification degree when the received signal is too small. As described above, the UE needs to change the amplification degree according to the strength of the received signal, and this operation is called AGC.
  • FIG. 1E is a diagram illustrating a partial structure of a receiver of a UE for performing AGC, according to an embodiment.
  • the received signal (input signal) of a UE is first amplified through a variable gain amplifier (VGA) e-10, and the amplified signal is transmitted to a detector e-20 that estimates the amplification intensity.
  • VGA variable gain amplifier
  • the signal strength estimated in this manner is compared with a set point determined by the dynamic range of the UE, a difference therebetween is confirmed by an error amplifier e-30, and this gain control is transmitted to a parameter of the VGA.
  • the amplification degree is determined in the VGA according to a difference between the estimated signal intensity and the set point, and the amplification degree serves to allow the amplified signal to be included in the dynamic range of the UE amplifier.
  • the AGC operation may be a process of determining how much the received signal is amplified.
  • FIG. 1F is a diagram illustrating an example of the strength of a signal passing through an amplifier when AGC is performed, if OFDM symbols (CP-OFDM or DFT-S-OFDM symbols) are received over time, according to an embodiment.
  • a UE performs an AGC operation, and it takes time to determine an amplification degree for amplifying the received signal with an appropriate intensity.
  • the time taken to determine an appropriate amplification degree of an amplifier through the AGC may be referred to as an AGC settling time.
  • the UE determines the amplification degree by performing AGC during a first partial period at the reception of control and data signals. Since a signal received during the AGC settling time is not reliable, the signal may be difficult to be used for decoding data or control signals. Thus, a signal, according to a value f-12 stabilized after the AGC settling time, may be used for decoding the data or control signals.
  • FIG. 1F illustrates, when the AGC settling time is 15 ⁇ sec, time occupied by the AGC in accordance with symbol lengths according to various numerologies defined in the NR system shown in Table 1, above.
  • f-10, f-20, f-30, and f-40 in FIG. 1F illustrate cases in which a subcarrier spacing is 15 kHz, 30 kHz, 60 kHz, and 120 kHz, respectively.
  • the AGC settling time may occupy two symbols. Unlike this, the AGC settling time may occupy one symbol in the subcarrier spacings corresponding to f-10, f-20, and f-30. In this case, the symbol corresponding to the AGC settling time may be difficult to be used for decoding data or control signals.
  • a high modulation rate such as 64QAM may be supported.
  • the high modulation rate may require a longer AGC settling time compared to a low modulation rate.
  • a reference signal RS
  • the front-loaded DMRS described above needs to be positioned in consideration of AGC. Therefore, there is a need to change a method of performing AGC due to the above issues in the NR system.
  • an embodiment of the disclosure provides a method of performing AGC in consideration of these problems.
  • Another embodiment of the disclosure provides operation methods of a gNB and a UE required when performing AGC, according to the method provided in the first embodiment.
  • a method and apparatus for efficiently performing AGC by a UE performing NR V2X sidelink control and data signal reception is provided.
  • a method for efficiently performing AGC needs to efficiently perform AGC in an NR sidelink communication system by consider the following four (4) factors:
  • the number of symbols occupied by the AGC settling time may vary according to the subcarrier spacing. Specifically, as the subcarrier spacing increases, the number of symbols occupied by the AGC settling time increases.
  • the AGC settling time required to perform AGC should be determined so that the reception performance is not degraded, and the AGC settling time should not be long so that the transmission efficiency is not lowered.
  • a receiver If only symbols for transmitting data and control signals are transmitted/received without a separate signal in order to perform AGC, a receiver has to use a first symbol of the data and control signal to perform AGC, and thus the first symbol cannot be used for decoding the data and control signal. As a result, the reception performance of the data and control signal is inevitably deteriorated.
  • a dedicated signal or preamplifier for performing AGC is transmitted before transmitting the data and control signal, a reception power amplification level may be set through the dedicated signal or preamble for performing ACG, which has been previously transmitted, even though AGC is not performed again upon receiving the data and control signal.
  • frequency and time resources are used to transmit the dedicated signal or preamble for performing AGC, the frequency and time resources may not be used for another data transmission, thereby reducing frequency usage efficiency.
  • a method of performing AGC is provided based on the above factors 1 to 3.
  • FIG. 1G is a diagram illustrating a performance degradation according to ACG determination time for a short symbol length in accordance with support of a wide-length subcarrier spacing, according to an embodiment.
  • g-10 and g-20 experimental environments are shown. As shown in g-10 and g-20, in the experiments according to this figure, an experiment on a data channel is assumed, and DMRSs are positioned in third and twelfth symbols. g-10 indicates a case of not transmitting a preamble for AGC and g-20 indicates a case of transmitting a preamble for AGC in a first symbol of a slot.
  • the method is a method of configuring a preamble for efficiently performing AGC in an NR sidelink communication system.
  • the method may be a method of maintaining a time domain in which control information and data signals are transmitted according to subcarrier spacing and inserting a preamble into a previous (i.e., immediately prior) symbol.
  • a preamble is transmitted from the last symbol or the last two symbols of a slot n-1.
  • the preamble may not be defined in units of OFDM symbols, but may be transmitted by a predetermined or indicated length or a length defined as a fixed value, for example, a length corresponding to 15 usec.
  • a one-symbol length preamble is inserted for a subcarrier spacing corresponding to 60 kHz. However, no preamble is inserted for subcarrier spacings corresponding to 15 kHz and 30 kHz.
  • a one-symbol length preamble is inserted for a subcarrier spacing corresponding to 60 kHz.
  • a preamble with two symbol lengths is inserted for a subcarrier spacing corresponding to 120 kHz.
  • a one-symbol length preamble can be inserted for 120 kHz in consideration of the preamble overhead in the same manner as in 60 kHz.
  • a method of inserting a preamble into a first symbol or first two symbols of a time domain in which control and data signals are transmitted according to the subcarrier spacing, and transmitting the control and data signals after the preamble is provided.
  • the preamble is transmitted from the first or first two symbols of the slot n.
  • the preamble may not be defined in units of OFDM symbols, but may be transmitted by a predetermined or indicated length or a length defined as a fixed value, for example, a length corresponding to 15 usec.
  • a one-symbol length preamble is inserted for a subcarrier spacing corresponding to 60 kHz. However, no preamble is inserted for subcarrier spacings corresponding to 15 kHz and 30 kHz.
  • a one-symbol length preamble is inserted for the subcarrier spacing corresponding to 60 kHz.
  • a two-symbol length preamble is inserted for the subcarrier spacing corresponding to 120 kHz.
  • a preamble of one symbol can be inserted for 120 kHz in consideration of the preamble overhead in the same manner as in 60 kHz.
  • the preamble refers to a signal transmitted by a UE that transmits the control and data signals so that a UE receiving the control and data signals performs AGC, and may be replaced with other terms.
  • FIG. 1H is a diagram illustrating a Method-1 and a Method-2, according to an embodiment.
  • FDM through which a data channel and a control channel are simultaneously transmitted in different frequency domains is used in the same subframe, as shown in FIG. 1C.
  • a method in which the data channel and the control channel are subjected to FDM and a method in which the data channel and the control channel are subjected to time division multiplexing (TDM) can be considered together.
  • h-10, h-20, h-30, and h-40 methods in which the data channel and the control channel are subjected to multiplexing in the NR V2X sidelink are illustrated.
  • the methods of h-10, h-20, h-30, and h-40 will be described below.
  • control channel and data channel associated with the control channel are non-overlapped and transmitted in resources in time. Additionally, the resources in frequency used by the two channels are the same.
  • control channel and data channel associated with the control channel are non-overlapped and transmitted in resources in time. Additionally, the resources in frequency used by the two channels may be different.
  • control channel and data channel associated with the control channel are non-overlapped in resources in frequency and transmitted as time resources. Additionally, resources in time used by the two channels are the same.
  • part of the control channel and data channel associated with the part of the control channel are overlapped in resources in time and transmitted as non-overlapped frequency resources.
  • another associated data channel or part of another control channel is transmitted in resources in time in a non-overlapped manner.
  • control channel occupies one symbol and the data channel occupies five symbols in time.
  • data channel occupies five symbols in time.
  • the actual number of symbols in which the control channel and the data channel are transmitted may vary.
  • Method-1 the method of maintaining the time domain in which the control and data signals are transmitted according to the subcarrier spacing and inserting the preamble into the immediately previous symbol is illustrated in h-11, h-21, h-31, and h-41.
  • h-11, h-21, h-31, and h-41 respectively show examples of Method-1 according to the methods h-10, h-20, h-30, and h-40 in which the data channel and the control channel are subjected to multiplexing.
  • the preamble when the scheduling of the control and data signals is performed in the first symbol of the slot, the preamble may be inserted in the last symbol position of the previous slot.
  • FIG. 1I is a diagram illustrating the operation of a UE in accordance with Method-1, according to an embodiment.
  • a UE transmits control and data signals.
  • step i-02 it is determined whether preamble insertion is required according to subcarrier spacing. If preamble insertion is required according to subcarrier spacing, then in step i-03, a preamble is transmitted to a symbol immediately before the corresponding control and data signal. If the scheduling of the control and data signals is performed in a first symbol of a slot, the UE may transmit the slot in advance before transmitting the control and data signals and may transmit the preamble in the last symbol position of the slot.
  • step i-11 a UE receives the control and data signals.
  • step i-12 it is determined whether the preamble reception for AGC is performed according to subcarrier spacing. If it is determined that the preamble reception for AGC is performed according to subcarrier spacing, a preamble is received by monitoring the previous symbol of the received signal in step i-13. If it is determined that the reception of the preamble for AGC is not necessary according to the subcarrier spacing in step i-12, the control and data signals are immediately received in step i-14.
  • Method-2 a method of inserting a preamble into a symbol preceding a time domain in which control and data signals are transmitted at a subcarrier spacing and transmitting the control and data signals after the preamble is shown through h-12, h-22, h-32, and h-42 in FIG. 1H.
  • h-12, h-22, h-32, and h-42 respectively show examples of the Method-2 according to the methods h-10, h-20, h-30, and h-40 in which the data channel and the control channel are subjected to multiplexing.
  • FIG. 1J is a diagram illustrating the operation of a UE in accordance with Method-2, according to an embodiment.
  • a UE transmits control and data signals.
  • step j-02 it is determined whether preamble reception for AGC is performed according to subcarrier spacing. If preamble reception is performed for subcarrier spacing, then in step j-3, a preamble is transmitted to a symbol preceding a transmission signal. If it is determined that the insertion of the preamble is not necessary according to the subcarrier spacing in step j-02 (if preamble reception is not performed for subcarrier spacing), only the control and data signals are required to be transmitted without the insertion of the preamble in step j-04.
  • a UE receives the control and data signals.
  • step j-12 it is determined whether preamble reception for AGC is performed according to subcarrier spacing. If it is determined that preamble reception for AGC is performed for subcarrier spacing, the preamble is received by monitoring the first symbol of the received signal in step j-13. If it is determined that the reception of the preamble for AGC is not necessary according to the subcarrier spacing in step j-12, the control and data signals are immediately received in step j-14.
  • a preamble insertion period according to Method-1 and Method-2 may be performed as follows.
  • preamble transmission is performed for every scheduled transmission slot.
  • preamble transmission is performed in a first scheduled transmission slot.
  • Method-3 if preamble insertion is required according to a subcarrier interval, preamble transmission is performed in a first scheduled transmission slot, but the preamble is not transmitted when scheduling is performed again in slot A (i.e., first scheduled transmission slot) after first slot transmission.
  • Method-1 of the preamble insertion period is a method of transmitting a preamble every scheduled transmission slot, but unnecessary overhead may increase.
  • Method-2 thereof may reduce unnecessary overhead by transmitting a preamble in the first scheduled transmission slot.
  • Method-3 thereof is based on the method-2, but may reduce the overhead more than method-2 by introducing a transmission window of the slot A.
  • the UE may perform AGC by receiving the preamble only at the corresponding time point in consideration of the preamble transmission period.
  • Another embodiment of the disclosure describes a method of solving an issue related to a position of an RS transmitted in a symbol preceding the time domain in which control and data signals are transmitted, corresponding to the fourth factor (factor 4) among the factors to be considered in performing AGC in the NR V2X sidelink communication system, discussed above.
  • a the front-loaded DMRS was introduced to position the DMRS in front of the time domain of the data channel to enable fast channel estimation, thereby reducing the latency of data decoding.
  • the RS is included in the AGC settling section, a serious problem may occur in terms of the reception performance because the RS cannot be used for channel estimation.
  • the front-loaded DMRS is positioned at the first symbol of the data channel and the first symbol of the data channel is used for AGC by Method-2, disclosed above, it is necessary to determine the position of the front-loaded DMRS.
  • the aforementioned Method-1 has an advantage of not having to further consider the positioning of the RS by maintaining the time domain in which the control and data signals are transmitted and inserting the preamble into the immediately preceding symbol.
  • a method for configuring the position of an RS in an NR V2X sidelink communication system and specifically, a method for configuring a gNB and a UE for a DMRS is provided.
  • the DMRS of the data channel introduced in the NR UE-to-gNB links Uu a-30 and a-35 is designed to be configured in a flexible manner.
  • configuration information on the DMRS pattern in the NR system may be as follows.
  • DMRS information may be configured on a data channel in NR Uu communication system based on the five (5) following pieces of information.
  • DMRS position configuration including the position of front-loaded DMRS varies depending on whether corresponding DMRS pattern is PDSCH or PUSCH mapping type A and type B.
  • DMRS pattern type 1 or type 2 is configured in RRC, where dmrs-Type ⁇ ⁇ 1,2 ⁇
  • DMRS port number and number of CDM groups are indicated through downlink control information (DCI).
  • DCI downlink control information
  • the DMRS in the NR V2X sidelink communication system needs to be designed in consideration of the characteristics of the sidelink. Specifically, D2D communication is performed using other vehicle UEs a-10, a-11, and a-12; a pedestrian portable UE a-15; and side links (PC5), a-20, a-21, a-22, and a-25. Therefore, unlike cellular communication using the gNB a-01 and the vehicle UE-to-gNB links Uu a-30 and a-35, two channels, such as a PDSCH and a PUSCH, do not need to be defined.
  • the method of configuring the DMRS through the RRC in the NR Uu communication system is not suitable.
  • the following five (5) DMRS design elements to be considered for NR sidelink communication based on the method of configuring DMRS information for the data channel in the NR Uu communication system are as follows.
  • PUSCH mapping type A and type B are recycled in the NR Uu communication system using the method of configuring the position of the DMRS in the NR sidelink.
  • the DMRS is designed only for 2/4/7 when a scheduled symbol length is NCP.
  • the DMRS positions for various symbol lengths are supported. Therefore, as a method of supporting a physical sidelink shared channel (PSSCH) mapping type utilizing the PUSCH mapping type A and type B in the NR Uu communication system as the method of configuring the position of the DMRS in the NR sidelink, there may be the following three (3) alternatives.
  • PSSCH physical sidelink shared channel
  • reference point l for position is defined from a first symbol of a slot.
  • DMRS position in Table 4, below, is used
  • the meaning of "duration in symbols” in Table 4, below, represents a symbol duration between the first symbol of the slot and the last symbol of the scheduled PSSCH.
  • reference point l for position is defined from a first symbol of a scheduled PSSCH.
  • DMRS position is determined based on Table 5, below.
  • DMRS position in Table 6 is used when a preamble for AGC is inserted for one symbol. Otherwise, DMRS position in Table 5 is used.
  • the position of the DMRS disclosed in Table 6 is shown in k-02 when the symbol length of the PSSCH scheduled is 7 and the number of additional DMRSs is configured as one.
  • k-01 indicates a DMRS position for the existing PUSCH mapping type B in the same case.
  • DMRS position in Table 7, below is used when a preamble for AGC is inserted for two symbols. Otherwise, DMRS position in Table 5 is used
  • both the DMRS positions presented in alternative-1 and alternative-2 may be used, and the method of configuring the DMRS position described in alternative-1 and alternative-2 is referred to.
  • the DMRS pattern may be indicated by SCI. If the DMRS pattern is type A or type B, it may be indicated by sidelink MIB or SIB. If the DMRS pattern is type A or type B, it may be indicated according to a resource pool configuration.
  • the above Tables 4 and 5 may be used for positioning the DMRS for the NR sidelink even when the above-described Method-1 or Method-2 are not used, that is, even when a preamble for AGC is not introduced.
  • the DMRS pattern (type 1 and type 2) in the NR sidelink may be considered.
  • the number of orthogonal DMRS ports supported in the NR sidelink should be considered together to determine the DMRS pattern.
  • a higher rank is generally difficult to support in a sidelink environment compared to a Uu communication environment.
  • the two-symbol pattern for supporting the plurality of orthogonal DMRS ports may be excluded from consideration. Therefore, in Tables 4, 5, 6, and 7, only the DMRS position configuration for a case where the one-symbol pattern is supported is considered.
  • the DMRS pattern may be type 1 or type 2 indicated by SCI; the DMRS pattern may be type 1 or type 2 indicated by sidelink MIB or SIB; or the DMRS pattern may be type 1 or type 2 indicated according to resource pool configuration.
  • a method of indicating the NR sidelink DMRS port number and the number of CDM groups may or may not be indicated depending on the maximum number of orthogonal DMRS ports supported by the NR sidelink.
  • a method of configuring the number of additional DMRSs ( dmrs-Additional ⁇ ⁇ 0,1,2,3 ⁇ ) in the NR sidelink should also be able to be indicated even without an RRC connection, unlike the NR Uu communication system. Therefore, the number of addition DMRSs may be indicated by SCI; the number of addition DMRSs may be indicated by side MIB or SIB; or the number of addition DMRSs may be indicated according to a resource pool configuration.
  • the structure of the DMRS is not limited to the data channel.
  • the same DMRS pattern and position configuration as the data channel may be applied to the control channel of the NR V2X sidelink.
  • the DMRS structure of the control channel of the NR V2X sidelink is designed differently, if the first symbol of the control channel is used for AGC by the aforementioned Method-2, the DMRS for the control channel should not be positioned in the first symbol of the control channel.
  • the symbol should be restricted so that the RS is not transmitted in the symbol.
  • CSI-RS channel state information RS
  • a transmission UE generates a DMRS sequence for a PSSCH in a sidelink and transmits the generated DMRS sequence to a reception UE is provided. Additionally, the reception UE receives the DMRS sequence. In the sidelink, the reception UE assumes that the DMRS is transmitted using the following sequence as in Equation (1).
  • r(n) denotes reference signal sequence and is defined in 38.211
  • c() denotes a pseudo-random sequence and is defined in 38.211 Section 5.2.1
  • the pseudo-random sequence may be initialized as follows in Equation (2).
  • Method 1 is decimal of PSCCH CRC. Here, is satisfied, and see 5.1 of TS38.212 for values of p and L.
  • Method 2 is destination ID. Here, is assumed as a destination ID value in SCI.
  • Method 3 is source ID. Here, is assumed as source ID value in SCI.
  • Method 4 is sidelink synchronization ID.
  • the sidelink synchronization ID refers to an ID used at the time of synchronization in the sidelink.
  • Method 5 is a combination of the above methods 1 to 4. If the number of bits used in Methods 1 to 4 is 16 bits or less, a combination of the different methods may be considered when the number of bits of does not exceed 16 bits even in the combination of the different methods. For example, in the case where the method 2 (destination ID) and the method 3 (source ID) are combined, assuming that the destination ID is 4-bit information and the source ID is also 4-bit information, may be determined in a combination of destination ID+source ID or source ID+destination ID. Through such a combination, it may be possible to further randomize the DMRS sequence.
  • the UE may assume this and receive the DMRS for the PSSCH.
  • a method in which a transmission UE indicates information on a DMRS port for a PSSCH in a sidelink is provided.
  • signaling information may be determined by the following four (4) conditions.
  • Condition 1 is a maximum number of orthogonal DMRS ports supported for single user MIMO (SU-MIMO) per UE.
  • a method of indicating a DMRS port may vary according to Condition 1.
  • Condition 2 is a maximum orthogonal DMRS ports supported for multi-user MIMO (MU-MIMO) per UE.
  • a method of indicating a DMRS port may vary by Condition 2.
  • Condition 3 is a used DMRS configuration type.
  • a method of indicating a DMRS port may vary by Condition 3.
  • the DMRS pattern type 1 or the DMRS pattern type 2 may be used as the DMRS configuration type of the Condition 3.
  • the embodiment of the disclosure is not limited thereto.
  • the number of patterns to be used may vary.
  • the DMRS pattern type 1 may refer to the description with reference to 1d-10 of FIG. 1D.
  • the DMRS pattern type 2 may refer to the description with reference to 1d-20 of FIG. 1D.
  • pattern types 1 and 2 are not limited to 1d-10 and 1d-20, and various DMRS patterns (for example, patterns configured or predefined by the gNB) may be used.
  • various DMRS patterns for example, patterns configured or predefined by the gNB
  • Condition 4 is whether to indicate a number of DMRS CDM groups.
  • a method of indicating the DMRS port may vary by Condition 4. If the number of CDM groups is 1, the ratio of PSSCH EPRE (Energy Per Resource Element ) to DMRS EPRE may be assumed to be a predetermined value or a configured value (for example, 0 dB). If the number of CDM groups is 2, the ratio of PSSCH EPRE to DMRS EPRE may be assumed to be a predetermined value or a configured value (for example, -3 dB). If the number of CDM groups is 3, the ratio of PSSCH EPRE to DMRS EPRE may be assumed to be a predetermined value or a configured value (for example, -4.77 dB). In addition, if the number of DMRS CDM groups is indicated, a reception UE may emulate MU interference at the time of MU-MIMO support.
  • information for indicating a DMRS port may be determined based on at least one of Conditions 1 to 4, above.
  • An example of a specific method of indicating a DMRS port is as follows.
  • Condition 1 (2 ports) + Condition 2 (1 port) + Condition 3 (type 2) + Condition 4 (indicated)
  • DMRS port-related information e.g., a DMRS port number, a number of DMRS ports, and a number of CDM groups
  • condition 1 (2 ports) + condition 2 (0 ports) + condition 3 (type 2) + condition 4 (indicated)
  • condition 1 2 ports
  • condition 2 (0 ports) + condition 3 (type 2) + condition 4 (indicated)
  • condition 4 indicated
  • Table 9 may indicate SCI, and thus DMRS port-related information may be indicated.
  • Condition 1 (2 ports) + Condition 2 (1 port) + Condition 3 (type 2) + Condition 4 (not indicated)
  • Table 10 may indicate SCI, and thus DMRS port-related information may be indicated.
  • Condition 1 (2 ports) + Condition 2 (0 ports) + Condition 3 (type 2) + Condition 4 (not indicated)
  • Table 11 may indicate SCI, and thus DMRS port-related information may be indicated.
  • Condition 1 (4 ports) + Condition 2 (2 ports) + Condition 3 (type 2) + Condition 4 (indicated)
  • Condition 1 4 ports
  • Condition 2 (2 ports) + Condition 3 (type 2) + Condition 4 (indicated)
  • Table 12-1 may indicate SCI, and thus DMRS port-related information may be indicated.
  • Condition 1 (4 ports) + Condition 2 (1 port) + Condition 3 (type 2) + Condition 4 (indicated)
  • Table 13 may indicate SCI, and thus DMRS port-related information may be indicated.
  • Condition 1 (4 ports) + Condition 2 (2 ports) + Condition 3 (type 2) + Condition 4 (not indicated)
  • Table 14 may indicate SCI, and thus DMRS port-related information may be indicated.
  • Condition 1 (4 ports) + Condition 2 (1 ports) + Condition 3 (type 2) + Condition 4 (not indicated)
  • Table 15 may indicate SCI, and thus DMRS port-related information may be indicated.
  • Condition 1 (2 ports) + Condition 2 (1 port) + Condition 3 (type 1) + Condition 4 (indicated)
  • Table 16 may indicate SCI, and thus DMRS port-related information may be indicated.
  • Condition 1 (2 ports) + Condition 2 (0 ports) + Condition 3 (type 1) + Condition 4 (indicated)
  • Table 17 may indicate SCI, and thus DMRS port-related information may be indicated.
  • Condition 1 (2 ports) + Condition 2 (1 port) + Condition 3 (type 1) + Condition 4 (not indicated)
  • Table 18 may indicate SCI, and thus DMRS port-related information may be indicated.
  • Condition 1 (2 ports) + Condition 2 (0 ports) + Condition 3 (type 1) + Condition 4 (not indicated)
  • Table 19 may indicate SCI, and thus DMRS port-related information may be indicated.
  • Condition 1 (4 ports) + Condition 2 (2 ports) + Condition 3 (type 1) + Condition 4 (indicated)
  • Table 20 may indicate SCI, and thus DMRS port-related information may be indicated.
  • Condition 1 (4 ports) + Condition 2 (1 port) + Condition 3 (type 1) + Condition 4 (indicated)
  • Table 21 may indicate SCI, and thus DMRS port-related information may be indicated.
  • Condition 1 (4 ports) + Condition 2 (2 ports) + Condition 3 (type 1) + Condition 4 (not indicated)
  • Table 22 may indicate SCI, and thus DMRS port-related information may be indicated.
  • Condition 1 (4 ports) + Condition 2 (1 port) + Condition 3 (type 1) + Condition 4 (not indicated)
  • Table 23 may indicate SCI, and thus DMRS port-related information may be indicated.
  • the method for indicating the DMRS port information for the PSSCH disclosed in this embodiment is distinguished from the method in an existing communication system based on at least one of whether to support the maximum number of orthogonal DMRS ports to be supported for SU-MIMO per UE supported in a sidelink; whether to support the maximum number of orthogonal DMRS ports to be supported for MU-MIMO per UE; whether to support the used DMRS configuration type; and whether to support the number of DMRS CDM groups.
  • a method of minimizing unnecessary signaling may be used to minimize the signaling overhead.
  • the indexing orders may be modified for each of the signaling tables.
  • an additional method for inserting a preamble according to the subcarrier spacing is provided.
  • the following has been disclosed as a method of configuring a preamble in order to efficiently perform AGC in the NR sidelink communication system.
  • preambles are not inserted for subcarrier spacings corresponding to 15kHz/30kHz.
  • a one-symbol length preamble is inserted.
  • a two-symbol length preamble may be inserted or a one-symbol length preamble may be inserted in consideration of the preamble overhead in the same manner as in 60 kHz.
  • a preamble is not inserted for the subcarrier spacing corresponding to 15 kHz.
  • a one-symbol length preamble is inserted.
  • a two-symbol length preamble is inserted. This method has been disclosed on the assumption that the time interval required for AGC is required to be 35 ⁇ sec for all subcarrier spacing.
  • a one- symbol length preamble is inserted.
  • a two-symbol length preamble is inserted.
  • the preamble is always transmitted in the AGC region.
  • sensing such as listen before talk (LBT)
  • LBT listen before talk
  • the UE may determine whether a corresponding channel is idle or busy by performing energy detection on the preamble in this region. In this case, when the channel is idle, it is determined that the channel is not occupied by another UE. When the channel is busy, it is determined that the channel is occupied by another UE.
  • the preamble When the preamble is transmitted in the AGC region by the second method, it means that control information and data are transmitted in the next slot. On the contrary, according to Method-2, described above, the control information and data are transmitted in a corresponding slot. Therefore, when using the second method, it can be very important to select resources by performing sensing in the sidelink.
  • the preamble refers to a signal transmitted by a UE transmitting the control and data signals so that a UE receiving control and data signals performs AGC.
  • a method in which a preamble is inserted (preamble length and positioning) according to the subcarrier spacing is not limited to the methods described above.
  • FIGS. 1L and 1M a transmitter, a receiver, and a processor of each of a UE and a gNB are illustrated in FIGS. 1L and 1M, respectively.
  • the receiver, the processor, and the transmitter of the gNB and the UE should operate according to the above-described embodiments.
  • FIG. 1L is a block diagram illustrating an internal structure of a UE, according to an embodiment.
  • a UE includes a UE receiver 1800, a UE transmitter 1804, and a UE processor 1802.
  • the UE receiver 1800 and the UE transmitter 1804 may collectively be referred to as a transceiver.
  • the transceiver may transmit and receive a signal to and from a gNB.
  • the signal may include control information and data.
  • the transceiver may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal and an RF receiver for low-noise amplifying a received signal and down-converting a frequency.
  • the transceiver may receive a signal through a wireless channel, output the signal to the UE processor 1802, and transmit a signal output from the UE processor 1802 through a wireless channel.
  • the UE processor 1802 may control a series of processes to operate the UE according to the above-described embodiment of the disclosure.
  • the UE processor 1802 may be referred to as a controller, and the controller may be defined as a circuit, an application specific integrated circuit (ASIC), or at least one processor.
  • ASIC application specific integrated circuit
  • FIG. 1M is a block diagram illustrating an internal structure of a GNB, according to an embodiment.
  • a gNB of the disclosure may include a gNB receiver 1901, a gNB transmitter 1905, and a gNB processor 1903.
  • the gNB receiver 1901 and the gNB transmitter 1905 collectively be referred to as a transceiver.
  • the transceiver may transmit and receive a signal to and from a UE.
  • the signal may include control information and data.
  • the transceiver may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal and an RF receiver for low-noise amplifying and down-converting a received signal.
  • the transceiver may receive a signal through a wireless channel, may output the signal to the gNB processor 1903, and may transmit the signal output from the gNB processor 1903 through a wireless channel.
  • the gNB processor 1903 may control a series of processes to operate the gNB.
  • the gNB processor 1903 may be referred to as a controller, and the controller may be defined as a circuit, an ASIC, or at least one processor.
  • Another embodiment of the disclosure describes a method of determining an AGC in a sidelink, a transmission position of a PSCCH according to the AGC, and a DMRS transmission position for a PSSCH.
  • a symbol region for AGC may be required before transmitting control and data information in the sidelink.
  • the following alternatives may be considered for the transmission position of the PSCCH in the sidelink.
  • PSCCH is located at first sidelink symbol of slot
  • PSCCH is located at second sidelink symbol of slot
  • PSCCH is located at third sidelink symbol of slot
  • the "side link symbol” refers to a symbol used as a sidelink in a slot. Note that all symbols in the slot may be used for sidelink transmission and only some of the slots may be used for sidelink transmission. In the disclosure, it is specified that a position in time assumed for sidelink transmission is determined on the basis of a sidelink symbol.
  • a symbol length X of a PSCCH may be pre-configured for each TX/RX resource pool. For example, X ⁇ 2,3 ⁇ may be configured to a possible length of X.
  • a position in frequency of the PSCCH may be transmitted only in one subchannel among the subchannels in which the PSSCH is scheduled as shown in FIG.
  • FIG. 2 illustrates a case in which four subchannels (LsubCHs) are allocated to a PSSCH starting from a third subchannel based on low subchannels in frequency of a subchannel configured as a resource pool.
  • the PSCCH is mapped from the lowest PRB in frequency in a region where the PSSCH is allocated and is transmitted in one subchannel.
  • This embodiment describes a method of determining a DMRS transmission position for the PSSCH for the above-mentioned three alternatives. Note that the disclosure is not limited to the DMRS positions presented below. Even if the detailed position where the DMRS is transmitted is changed, a method of determining the transmission position of the DMRS can be applied regardless of the detailed DMRS position, according to a UE speed limited by the disclosure, the configured number of DMRS symbols, and the number of subchannels allocated to the PSSCH, regardless of the detailed DMRS location.
  • the alternative 1 is a method in which a symbol region for AGC is not considered separately in a case in which a PSCCH is positioned in a first sidelink symbol of a slot.
  • An example of the PSCCH position for the alternative 1 is shown as 3-20 in FIG. 3A. Therefore, when the corresponding method is used, there is a disadvantage that a performance degradation of PSCCH reception may occur.
  • this method when the symbol length of the PSCCH is 3 or less, the PDCCH DMRS transmission position in the NR Uu system can be reused as it is. More specifically, a method of supporting a DMRS pattern in time for a PSSCH will be described below.
  • the position of the DMRS is based on the first symbol used for the sidelink.
  • the DMRS pattern for the PSSCH is defined as a single-symbol DMRS.
  • a DMRS type A (d-10) is a type that supports up to four orthogonal DMRS ports with a cyclic shift (CS) length 2 structure in Comb 2 structure.
  • a DMRS type B (d-30) is a structure in which an orthogonal cover codes (OCC) is applied in two REs adjacent to a frequency axis and an FDM is applied to support up to six orthogonal DMRS ports. Both patterns may be used in the sidelink, or only one of the two types of patterns may be selected and supported. If both two patterns are supported, the configuration for the two patterns may be pre-configured in the resource pool. Alternatively, it may be dynamically indicated through an SCI.
  • the DMRS pattern in time for the PSSCH can be determined by a method in which the single-symbol DMRS is transmitted within a symbol interval where the PSSCH is transmitted, and whether a single fixed DMRS pattern is used for the resource pool configuration or a plurality of DMRS patterns in time are used can be pre-configured.
  • the UE may select the corresponding pattern.
  • the information of the selected pattern may be informed to other UEs by SCI.
  • the selectable DMRS pattern in time may be "dmrs-AdditionalPosition" based on Table 24.
  • the actually transmitted DMRS pattern in time is determined by "duration in sidelink symbol” and the selected "dmrs-AdditionalPosition” based on Table 24.
  • the value of may be used as one fixed value or may be determined according to the PSCCH symbol length. For example, if the value of is fixed, may be 3. Unlike this, when the value of is determined according to the PSCCH symbol length, the value of may be pre-configured in the resource pool as 2 or 3. Unlike this, if the PSCCH symbol length in which the resource pool is configured is 2, the value of is determined as 2, or if the PSCCH symbol length in which the resource pool is configured is 3, the value of is determined as 3. 3-50 in FIG. 3B illustrates an example in which the value of is configured as 2 and four DMRS symbols are transmitted according to Table 24. In FIG. 3B, 3-60 in FIG. 3B illustrates an example in which the value of is configured as 3 and four DMRS symbols are transmitted according to Table 24.
  • the alternative 2 is a method in which one symbol region for AGC is considered in a case in which a PSCCH is positioned in a second sidelink symbol of a slot.
  • FIG. 3A an example of the PSCCH position for the alternative 2 is shown as 3-30.
  • the following methods may be considered.
  • the PDCCH DMRS transmission position in the NR Uu system cannot be reused as it is.
  • the first symbol of the sidelink is considered as the symbol for AGC
  • a first PSSCH DMRS position should be located after the PSCCH symbol.
  • the PSSCH DMRS cannot be transmitted in the sidelink first symbol. This is because, when the PSSCH DMRS is transmitted to the symbol region used in consideration of the AGC, distortion may occur in DMRS channel estimation and thus the PSSCH decoding performance may be degraded. Therefore, when the alternative 2 is considered, Table 25 below may be used instead of Table 24 in the above-described method of supporting DMRS pattern in time for PSSCH.
  • Table 25 may be used instead of Table 24 in the above-described method of supporting DMRS pattern in time for PSSCH.
  • the disclosure is not limited only to the DMRS position of Table 25.
  • the value of may be used as one fixed value or may be determined according to the PSCCH symbol length. For example, if the value of is fixed, may be 4. Unlike this, when the value of is determined according to the PSCCH symbol length, the value of may be pre-configured in the resource pool as 3 or 4. Unlike this, when the PSCCH symbol length in which the resource pool is configured is 2, the value of is determined as 3, and when the PSCCH symbol length in which the resource pool is configured is 3, the value of is determined as 4. 3-70 in FIG. 3C illustrates an example in which the value of is configured as 4 and two DMRS symbols are transmitted according to Table 25. 3-80 in FIG.
  • 3C illustrates an example in which the value of is configured as 4 and four DMRS symbols are transmitted according to Table 25.
  • the PSSCH DMRS is always transmitted after a region in which the PSCCH in time is transmitted, in the alternative 2 compared to the alternative 1, the last symbol of the PSCCH is pushed back by one symbol, and therefore, if a channel changes rapidly over time, the accuracy of channel estimation of the PSSCH located in the front region of the first PSSCH DMRS may be degraded. Therefore, when one or more of the following conditions are satisfied, the PSSCH DMRS may overlap the region where the PSCCH in time is transmitted and may be transmitted in another frequency domain. In the disclosure, the following conditions are not limited to the alternative 2.
  • UE speed absolute speed of TX UE or relative speed between TX/RX UEs
  • condition 1 may be a valid condition because the channel changes rapidly over time when the UE speed is high.
  • the corresponding condition may be established when the corresponding speed is A km/h or more.
  • the PSSCH region located in the front region of the first PSSCH DMRS increases along with an increase in the number of subchannels allocated by the PSSCH, the corresponding condition may be a valid condition.
  • the corresponding condition may be established.
  • the disclosure is not limited only to the above conditions.
  • a method of allowing the PSSCH DMRS to overlap the region where the PSCCH in time is transmitted and to be transmitted in other frequency domains can be considered.
  • the method may be used if the condition 2 and condition 3 are simultaneously satisfied.
  • Two methods in which the PSSCH DMRS is transmitted before the time domain in which the PSCCH is transmitted are illustrated 3-90 and 3-100 in FIG. 3D. First, as shown as 3-90 in FIG. 3D, as the first method, an example in which the value of is configured as 2 and four DMRS symbols are transmitted is shown.
  • the first method is a method in which the PSSCH DMRS is allowed to be transmitted in all frequency domains in which the PSCCH is not transmitted when the PSSCH DMRS overlaps with the region where the PSCCH in time is transmitted and is transmitted in other frequency domains.
  • the PSSCH DMRS may overlap the region where the PSCCH in time is transmitted in the remaining frequency domains.
  • the second method as shown 3-100 in FIG. 3D, an example in which the value of is configured as 2 according to Table 25 and four DMRS symbols are transmitted is shown.
  • the second method is a method in which the PSSCH DMRS is allowed to be transmitted in all frequency domains of another subchannel in which the PSCCH is not transmitted when the PSSCH DMRS overlaps with the region where the PSCCH in time is transmitted and is transmitted in other frequency domains.
  • the first DMRS symbol (Front-loaded DMRS) of the PSSCH DMRS is determined on the basis of the first symbol used in the sidelink and the value of is fixed or configured according to the PSCCH symbol length has been described.
  • the position of the first DMRS symbol of the PSSCH DMRS may be fixed or configured to always be located behind the PSCCH symbol in consideration of the PSCCH symbol length.
  • the position of the first DMRS symbol of the PSSCH DMRS may be determined in such a manner that the PSSCH DMRS symbol overlaps with the region where the PSCCH in time is transmitted and is transmitted in other frequency domains.
  • the PSSCH DMRS symbol may be allowed to overlap with the region in which the PSCCH in time is transmitted and to be transmitted in other frequency domains only when one or more of the above conditions are satisfied. If the PSSCH DMRS symbol overlaps the region in which the PSCCH in time is transmitted and is transmitted in other frequency domains, one or more PSSCH DMRS symbols may overlap the region where the PSCCH in time is transmitted, according to the length of the PSCCH, the position of the first DMRS symbol of the PSSCH DMRS, and the position of the next DMRS symbol. It may overlap with the region in which the PSCCH is transmitted in time. Note that the disclosure is not limited to the PSSCH DMRS position configuration method in Tables X and Y.
  • the PSSCH DMRS symbol position may be determined to always be located after the PSCCH in time.
  • the PSSCH DMRS symbol position may overlap the region where the PSCCH in time is transmitted and may be configured in other frequency domains. In the latter case, the following three methods can be considered.
  • PSSCH DMRS transmission of the overlapping region is not allowed, and the PSSCH DMRS of the corresponding region is punctured (or rate-matched).
  • PSSCH DMRS transmission of the overlapping region is allowed and the PSSCH DMRS is transmitted.
  • PSSCH DMRS transmission of the overlapped region is allowed when the proposed condition [the PSSCH DMRS symbol overlaps the region where the PSCCH in time is transmitted and is transmitted in other frequency domains] is satisfied.
  • the PSCCH is positioned in the third sidelink symbol of the slot, one or two symbol regions for AGC may be considered.
  • an example of a PSCCH position for the alternative 3 is shown as 3-110 in FIG. 3E assuming one symbol region for AGC.
  • the PSSCH may be transmitted in the first sidelink symbol and the PSSCH DMRS may be transmitted in the second sidelink symbol.
  • the channel estimation performance may be degraded when the PSSCH DMRS is located behind the PSCCH symbol in time in a case where the channel changes rapidly over time.
  • the following condition may be considered as a condition that the PSSCH DMRS is transmitted in the second sidelink symbol.
  • UE speed absolute speed of TX UE or relative speed between TX/RX UEs
  • the PSSCH DMRS may be transmitted in the second sidelink symbol only when one or more of the above conditions are satisfied. Otherwise, the PSSCH DMRS is transmitted behind the PSCCH region in time as shown 3-120 in FIG. 3E. In the case of 3-120 in FIG. 3E, two symbol regions for AGC may be considered.
  • a component included in the disclosure is expressed in the singular or the plural according to a presented detailed embodiment.
  • the singular form or plural form is selected for convenience of description suitable for the presented situation, and various embodiments of the disclosure are not limited to a single element or multiple elements thereof.
  • either multiple elements expressed in the description may be configured into a single element or a single element in the description may be configured into multiple elements.
  • an element expressed in a plural form may be configured in singular, or an element expressed in a singular form may be configured in plural.
  • drawings illustrating the method of the disclosure may include some additional components and/or omit some of components within the scope of not impairing the nature of the disclosure.

Landscapes

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

Abstract

La présente invention se rapporte à un procédé et à un système de communication permettant de fusionner un système de communication de 5è génération (5G) avec une technologie associée à l'Internet des objets (IdO), pour qu'il prenne en charge des débits de données supérieurs à ceux d'un système de 4è génération (4G). La présente invention peut être appliquée à des services intelligents basés sur la technologie de communication 5G et sur la technologie de type IdO, tels que des services de maison intelligente, de bâtiment intelligent, de ville intelligente, de voiture intelligente, de voiture connectée, de soins de santé, d'éducation numérique, de vente au détail intelligente, de sûreté et de sécurité. Le procédé consiste à déterminer s'il faut transmettre un préambule pour une commande de gain automatique (AGC), à déterminer un créneau et au moins un symbole dans le créneau pour transmettre le préambule pour l'AGC, dans le cas où il est déterminé de transmettre le préambule pour l'AGC, et transmettre, à un second terminal, le préambule pour l'AGC dans le créneau déterminée et le ou les symboles dans le créneau.
PCT/KR2019/014826 2018-11-02 2019-11-04 Procédé et appareil pour la commande automatique de gain dans un système véhicule-à-tout WO2020091556A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201980073177.5A CN112970223A (zh) 2018-11-02 2019-11-04 车到万物系统中用于自动增益控制的方法和装置
ES19878362T ES2966505T3 (es) 2018-11-02 2019-11-04 Procedimiento y aparato para el control automático de ganancia en el sistema vehículo-a-todo
EP19878362.3A EP3857806B1 (fr) 2018-11-02 2019-11-04 Procédé et appareil pour la commande automatique de gain dans un système véhicule-à-tout

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2018-0133629 2018-11-02
KR20180133629 2018-11-02
KR10-2019-0099607 2019-08-14
KR1020190099607A KR102662626B1 (ko) 2018-11-02 2019-08-14 V2x 시스템에서 자동 이득 제어 방법 및 장치

Publications (1)

Publication Number Publication Date
WO2020091556A1 true WO2020091556A1 (fr) 2020-05-07

Family

ID=70457867

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2019/014826 WO2020091556A1 (fr) 2018-11-02 2019-11-04 Procédé et appareil pour la commande automatique de gain dans un système véhicule-à-tout

Country Status (1)

Country Link
WO (1) WO2020091556A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015080853A1 (fr) * 2013-11-27 2015-06-04 Intel Corporation Concepts de signaux pour sous-trames d2d
WO2015130067A1 (fr) * 2014-02-25 2015-09-03 엘지전자 주식회사 Procédé et appareil de génération par un terminal d'un signal de dispositif à dispositif dans un système de communication sans fil
US20160381708A1 (en) * 2012-04-13 2016-12-29 Intel Corporation Multi-access scheme and signal structure for d2d communications
WO2017023150A1 (fr) * 2015-08-06 2017-02-09 엘지전자 주식회사 Procédé pour transmettre un signal de communication v2x dans un système de communication sans fil et appareil associé

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160381708A1 (en) * 2012-04-13 2016-12-29 Intel Corporation Multi-access scheme and signal structure for d2d communications
WO2015080853A1 (fr) * 2013-11-27 2015-06-04 Intel Corporation Concepts de signaux pour sous-trames d2d
WO2015130067A1 (fr) * 2014-02-25 2015-09-03 엘지전자 주식회사 Procédé et appareil de génération par un terminal d'un signal de dispositif à dispositif dans un système de communication sans fil
WO2017023150A1 (fr) * 2015-08-06 2017-02-09 엘지전자 주식회사 Procédé pour transmettre un signal de communication v2x dans un système de communication sans fil et appareil associé

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
3GPP TS 36.211, June 2018 (2018-06-01)
3GPP TS 38.211, July 2018 (2018-07-01)
SAMSUNG: "Discussion on AGC settling issue for NR sidelink", 3GPP DRAFT; R1-1808779 DISCUSSION ON AGC SETTLING ISSUE FOR NR SIDELINK, vol. RAN WG1, 10 August 2018 (2018-08-10), Gothenburg, Sweden, pages 1 - 4, XP051516152 *
See also references of EP3857806A4

Similar Documents

Publication Publication Date Title
EP3857806A1 (fr) Procédé et appareil pour la commande automatique de gain dans un système véhicule-à-tout
WO2020263048A1 (fr) Procédé et appareil pour améliorer la couverture pour pdcch dans un système de communication sans fil
WO2019139444A1 (fr) Procédé, dispositif et système d'attribution de ressources pour système de communication sans fil
WO2020060285A1 (fr) Procédé et appareil pour la transmission et la réception d'un canal de couche physique en fonction d'une priorité dans un système de communication sans fil
WO2018030710A1 (fr) Procédé et appareil de programmation de données de liaison montante dans un système de communications mobiles
WO2021002725A1 (fr) Procédé et appareil de réception rmsi pour un ue de faible coût dans nr
WO2018212509A1 (fr) Procédé et appareil de configuration et de surveillance d'ensemble de ressources de commande de canal de commande de liaison descendante dans un système de communication sans fil
WO2021040338A1 (fr) Procédé et appareil d'émission et de réception de multiples éléments de données dans un système de communication coopératif sans fil
WO2019050381A1 (fr) Procédé, dispositif et système de transmission montante et de réception descendante dans un système de communication sans fil
EP3530056A1 (fr) Procédé, appareil de station de base et équipement utilisateur pour accès aléatoire
WO2018174643A1 (fr) Procédé d'attribution de csi-rs pour la gestion de faisceaux
WO2021066441A1 (fr) Procédé et appareil permettant de transmettre et de recevoir des signaux dans un système de communication sans fil
WO2019050371A1 (fr) Procédé de transmission et procédé de réception de données pour système de communication sans fil et appareil utilisant les procédés
WO2021091350A1 (fr) Procédé, équipement d'utilisateur, appareil et support de stockage lisible par ordinateur pour la transmission de pusch et procédé et station de base pour la réception de pusch
WO2019031884A1 (fr) Procédé et appareil de commande prenant en compte la partie de largeur de bande dans un système de communication sans fil de nouvelle génération
WO2011122852A2 (fr) Procédé et appareil permettant de contrôler un canal de signalisation dans un système de communication sans fil
WO2015122718A1 (fr) Procédé et appareil de réalisation d'une communication directe entre des terminaux dans un système de communication sans fil
WO2021201533A1 (fr) Procédé et appareil permettant de réaliser une communication dans un système de communication sans fil
WO2020197354A1 (fr) Procédé et appareil d'émission et de réception de données multiples dans un système de communication coopératif sans fil
WO2018110857A1 (fr) Procédé, appareil de station de base et équipement utilisateur pour accès aléatoire
WO2021049886A1 (fr) Procédé et appareil de transmission de s-ssb
WO2022139542A1 (fr) Procédé et dispositif permettant de prendre en charge une transmission multi-antennes de liaison latérale dans un système de communication sans fil
WO2021194185A1 (fr) Procédé et dispositif permettant de déterminer une procédure d'accès à un canal dans un système de communication sans fil
EP3459313A1 (fr) Procédé et appareil de programmation de données de liaison montante dans un système de communications mobiles
WO2018174690A2 (fr) Procédé de communication v2x réalisé par un terminal v2x dans un système de communication sans fil, et terminal l'utilisant

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19878362

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2019878362

Country of ref document: EP

Effective date: 20210430