WO2020200056A1 - Procédé et appareil de production de signal de référence de démodulation - Google Patents

Procédé et appareil de production de signal de référence de démodulation Download PDF

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Publication number
WO2020200056A1
WO2020200056A1 PCT/CN2020/081512 CN2020081512W WO2020200056A1 WO 2020200056 A1 WO2020200056 A1 WO 2020200056A1 CN 2020081512 W CN2020081512 W CN 2020081512W WO 2020200056 A1 WO2020200056 A1 WO 2020200056A1
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WIPO (PCT)
Prior art keywords
terminal device
information
reference signal
demodulation pilot
pilot reference
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PCT/CN2020/081512
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English (en)
Chinese (zh)
Inventor
郭文婷
向铮铮
苏宏家
张锦芳
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华为技术有限公司
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Publication of WO2020200056A1 publication Critical patent/WO2020200056A1/fr

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    • 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
    • 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

Definitions

  • This application relates to the field of communication technology, especially V2X, intelligent driving, intelligent networked cars, etc., and especially relates to a method and device for generating a demodulated pilot reference signal.
  • a demodulation reference signal can generally be used for relative demodulation of a physical up share channel (PUSCH) and a physical up control channel (PUCCH).
  • PUSCH physical up share channel
  • PUCCH physical up control channel
  • DMRS can be generated by specifying a sequence.
  • LTE long term evolution
  • DFT discrete Fourier transform orthogonal frequency division multiplexing
  • u represents the group number
  • v represents the serial number.
  • u represents the group number
  • v represents the serial number.
  • u ⁇ 0,1,2, ⁇ ,29 ⁇ , v ⁇ 0,1 ⁇ that is, the root sequence u and v
  • the number of values is limited, so that the expression space of the demodulation pilot reference signal is limited.
  • due to the base sequence Performing a cyclic shift ⁇ will also affect the correlation of the demodulation pilot reference signal.
  • V2X vehicle-to-everything
  • the vehicle needs to communicate with anything outside, which means that the V2X system requires a large number of different (ie, unrelated) DMRSs.
  • the DMRS generated based on the ZC sequence may have a relatively large correlation, which cannot meet the actual application requirements of the V2X system.
  • a pseudo noise (PN) sequence is used to generate a DMRS.
  • the initial value of the PN sequence is related to the demodulation pilot scrambling identifier (scrambling identifier, SCID) and the cell identifier configured by the higher layer. That is to say, this method is mainly applied to the uplink and downlink communication links between the base station and the terminal device, that is, it is applied to a communication scenario configured with a cell identity.
  • the terminal devices of both parties may be in the coverage of the same cell, or may be in the coverage of different cells, or both may be in the coverage of no mobile network. If the terminal device is in the coverage area of no mobile network, it is likely that the cell identity is not configured. As a result, the terminal device cannot obtain the DMRS based on the PN sequence, and thus cannot communicate normally.
  • the embodiments of the present application provide a demodulation pilot signal processing method and device, which can ensure normal communication between terminal devices when there is no network coverage.
  • this application provides a method for generating a demodulation pilot reference signal, which may be executed by a first terminal device.
  • the first terminal device may be a terminal device or a component (such as a chip system) in the terminal device.
  • the method includes: the first terminal device determines the initial value of the pseudo-noise PN sequence according to the channel type and the first information, and generates the first demodulation pilot reference signal according to the initial value of the PN sequence, and then transmits the second terminal device to the second terminal device.
  • a demodulation pilot reference signal includes one or more of the identification of the first terminal device, system time information, and broadcast frequency index.
  • the first terminal device determines the initial value of the PN sequence according to the channel type and the first information, and then generates the first demodulation pilot reference signal according to the initial value of the PN sequence, and The first demodulation pilot reference signal is transmitted to the second terminal device.
  • the first information includes one or more of the identification of the first terminal device, system time information, and broadcast frequency index.
  • the demodulation pilot reference signal generation process is applicable to the scenario of configuring the cell identity, and the initial value of the demodulation pilot reference signal is related to the demodulation pilot scrambling code and cell identity configured by the higher layer.
  • the demodulation pilot reference signal generation method determines the initial value of the PN sequence in different channel types by combining different first information, and then generates the first demodulation pilot reference to be sent to the second terminal device Signal, and the first information includes one or more of the identification of the first terminal device, system time information, and broadcast frequency index. It can be seen that the first information used has nothing to do with the demodulation pilot scrambling code and cell ID configured by the higher layer. Even if the first terminal device and the second terminal device are not in the area where the cell ID is configured, the demodulation pilot can be generated normally. Reference signal.
  • the channel type is a data channel
  • the system time information includes first system time information
  • the first information includes the identifier of the first terminal device and the first system time information.
  • the first terminal device determines the initial value of the pseudo noise PN sequence according to the channel type and the first information, including:
  • the first terminal device determines the initial value of the pseudo noise PN sequence according to the identification of the first terminal device and the first system time information; or
  • the first terminal device determines the initial value of the PN sequence according to the identification of the first terminal device, the first system time information, and the configuration information of the demodulation pilot reference signal; wherein the first system time information is determined by the time slot index and the time domain symbol The time information represented by the index, the number of time slots and the number of time-domain symbols.
  • the configuration information of the demodulation pilot reference signal includes the number of demodulation pilot reference signals contained in each transmission time slot.
  • the position of the pilot reference signal and the configuration information of the demodulated pilot reference signal are network configuration information or information pre-stored by the first terminal device.
  • the first terminal device determines the initial value of the first demodulation pilot reference signal of the data channel based on the identification of the first terminal device and the first system time information, so that the data channel generated by each first terminal device can be The first demodulation pilot reference signals are different from each other. In this way, the discrimination of the first demodulation pilot reference signals corresponding to the data channels of different terminal devices is improved, thereby reducing interference between different terminal devices.
  • the demodulation pilot reference signal generation method provided in this application further includes:
  • the first terminal device obtains the check information of the control information from the control channel, and determines the identity of the first terminal device according to the check information of the control information, or
  • the first terminal device obtains the identification of the first terminal device from the control information, or
  • the first terminal device pre-stores the identification of the first terminal device.
  • the channel type is a control channel
  • the first information includes system time information
  • the system time information includes first system time information and second system time information.
  • the first terminal device determines the initial value of the pseudo noise PN sequence according to the channel type and the first information, including:
  • the first terminal device determines the initial value of the PN sequence according to the first system time information and the second system time information.
  • the first system time information is determined by the time slot index, the time domain symbol index, and the number of time slots and time domain symbols.
  • Characterized time information, the second system time information is the system time information when the first terminal device and the second terminal device are in a synchronized state, which is characterized by frame information and/or subframe information.
  • the first terminal device determines the initial value of the PN sequence based on the system time information, and then generates the first demodulation pilot reference signal of the control channel, and sends it to the second terminal device.
  • the second terminal device receives the first demodulation pilot reference signals from the control channels of the different first terminal devices, it can learn the subframe numbers and/or frame numbers of the different first demodulation pilot reference signals. If the subframe number and/or frame number of a certain first demodulation pilot reference signal is the same as the subframe number and/or frame number of the second terminal device itself, the sender of the first demodulation pilot reference signal Synchronize with the second terminal device. In this way, the second terminal device can determine the first terminal device synchronized with itself from among the plurality of first terminal devices. This improves the discrimination of the first demodulation pilot reference signal of the control channel of the synchronization source (the first terminal device), and reduces interference.
  • the channel type is a broadcast channel
  • the first information includes the identifier of the first terminal device and the broadcast frequency index.
  • the first terminal device determines the initial value of the pseudo noise PN sequence according to the channel type and the first information, including:
  • the first terminal device determines the initial value of the pseudo-noise PN sequence according to the identifier of the first terminal device and the broadcast frequency index, and the broadcast frequency index represents the index of the broadcast channel broadcast message frequency within a predetermined time period.
  • the second terminal device determines the initial value of the second demodulation pilot reference signal of the broadcast channel based on the identification of the first terminal device and the broadcast times index, and then provides information support for the local end to generate the second demodulation pilot reference signal.
  • this application provides a method for generating a demodulation pilot reference signal, which may be executed by a second terminal device.
  • the second terminal device may be a terminal device or a component (such as a chip system) in the terminal device.
  • the method includes: the second terminal device determines the initial value of the pseudo noise PN sequence according to the channel type and the first information, and generates the second demodulation pilot reference signal according to the initial value of the PN sequence. Wherein, both the first demodulation pilot reference signal and the second demodulation pilot reference signal are used for channel estimation.
  • the first information includes one or more of the identifier of the first terminal device, system time information, and broadcast frequency index, and the first terminal device is a terminal device that sends the first demodulation pilot reference signal to the second terminal device.
  • the channel type is a data channel
  • the system time information includes first system time information
  • the first information includes the identifier of the first terminal device and the first system time information.
  • the second terminal device determines the initial value of the pseudo noise PN sequence according to the channel type and the first information, including:
  • the second terminal device determines the initial value of the PN sequence according to the identification of the first terminal device and the first system time information; or
  • the second terminal device determines the initial value of the PN sequence according to the identification of the first terminal device, the first system time information, and the configuration information of the demodulation pilot reference signal; wherein the first system time information is based on the time slot index and the time domain symbol The time information represented by the index, the number of time slots and the number of time-domain symbols.
  • the configuration information of the demodulation pilot reference signal includes the number of demodulation pilot reference signals contained in each transmission time slot.
  • the position of the pilot reference signal and the configuration information of the demodulated pilot reference signal are network configuration information or information pre-stored by the second terminal device.
  • the second terminal device may also perform the following steps:
  • the second terminal device obtains the check information of the control information from the control channel, and determines the identity of the first terminal device according to the check information of the control information, or
  • the second terminal device obtains the identification of the first terminal device from the control information, or
  • the second terminal device pre-stores the identification of the first terminal device.
  • the channel type is a control channel
  • the first information includes system time information
  • the system time information includes first system time information and second system time information.
  • the second terminal device determines the initial value of the pseudo noise PN sequence according to the channel type and the first information, including:
  • the second terminal device determines the initial value of the pseudo-noise PN sequence according to the first system time information and the second system time information.
  • the first system time information is configured by the slot index, the time domain symbol index, and the number of time slots and time domain symbols.
  • the time information represented by the relationship, and the second system time information is the system time information when the first terminal device and the second terminal device are in a synchronized state represented by frame information and/or subframe information.
  • the channel type is a broadcast channel
  • the first information includes the identifier of the first terminal device and the broadcast frequency index.
  • the second terminal device determines the initial value of the pseudo-noise PN sequence according to the channel type and the first information, which can be specifically implemented as the following steps: the second terminal device determines the initial value of the PN sequence according to the identifier of the first terminal device and the broadcast times index, and broadcasts
  • the number index represents the index of the number of times the broadcast channel broadcast messages in a predetermined time period.
  • the present application provides a demodulation pilot reference signal generating device, which may be the first terminal device in the above first aspect.
  • the device includes a processor, a transmitter, a receiver, and a memory.
  • the processor is configured to determine the initial value of the pseudo-noise PN sequence according to the channel type and first information.
  • the first information includes one or more of the identification of the first terminal device, system time information, and broadcast frequency index; according to the PN sequence
  • the initial value is to generate the first demodulation pilot reference signal; the transmitter is used to send the first demodulation pilot reference signal to the second terminal device.
  • the channel type is a data channel
  • the system time information includes first system time information
  • the first information includes the identifier of the first terminal device and the first system time information.
  • the processor is configured to determine the initial value of the pseudo-noise PN sequence according to the channel type and the first information, including: determining the initial value of the pseudo-noise PN sequence according to the identifier of the first terminal device and the first system time information; or
  • the configuration information of demodulation pilot reference signals includes the number of demodulation pilot reference signals contained in each transmission time slot and the number of demodulation pilots
  • the location of the reference signal and the configuration information of the demodulated pilot reference signal are network configuration information or information pre-stored in the memory.
  • the processor is configured to control the receiver to obtain the check information of the control information from the control channel; determine the identity of the first terminal device according to the check information of the control information, or
  • the channel type is a control channel
  • the first information includes system time information
  • the system time information includes first system time information and second system time information.
  • the processor is configured to determine the initial value of the pseudo-noise PN sequence according to the channel type and the first information, including: determining the initial value of the PN sequence according to the first system time information and the second system time information, the first system time information is The time information represented by the time slot index, the time domain symbol index, the number configuration relationship between the time slot and the time domain symbol, the second system time information is the first terminal device and the second terminal device represented by the frame information and/or subframe information System time information when the terminal device is in a synchronized state.
  • the channel type is a broadcast channel
  • the first information includes the identification of the first terminal device and the broadcast frequency index.
  • the processor is configured to determine the initial value of the pseudo-noise PN sequence according to the channel type and the first information, and may be specifically implemented as: determining the initial value of the pseudo-noise PN sequence and the number of broadcasts according to the identifier of the first terminal device and the index of broadcast times The index represents the index of the number of times the broadcast channel broadcast messages in a predetermined time period.
  • the present application provides a device for generating a demodulation pilot reference signal.
  • the device may be the second terminal device in the second aspect.
  • the device includes a processor, a receiver, and a memory.
  • the processor is configured to determine the initial value of the pseudo-noise PN sequence according to the channel type and first information.
  • the first information includes one or more of the identification of the first terminal device, system time information, and broadcast frequency index.
  • a terminal device is a terminal device that sends a first demodulation pilot reference signal to a second terminal device; according to the initial value of the PN sequence, a second demodulation pilot reference signal is generated, the first demodulation pilot reference signal and the second The demodulation pilot reference signals are used for channel estimation.
  • the channel type is a data channel
  • the system time information includes first system time information
  • the first information includes the identifier of the first terminal device and the first system time information.
  • the processor is configured to determine the initial value of the pseudo-noise PN sequence according to the channel type and the first information, including: determining the initial value of the PN sequence according to the identifier of the first terminal device and the first system time information; or
  • the configuration information of demodulation pilot reference signals includes the number of demodulation pilot reference signals contained in each transmission time slot and the number of demodulation pilots
  • the location of the reference signal and the configuration information of the demodulated pilot reference signal are network configuration information or information pre-stored in the memory.
  • the receiver is used to obtain the check information of the control information from the control channel;
  • the processor is further configured to determine the identity of the first terminal device according to the check information of the control information, or
  • the receiver is also used to obtain the identification of the first terminal device from the control information, or
  • the memory is used to pre-store the identification of the first terminal device.
  • the channel type is a control channel
  • the first information includes system time information
  • the system time information includes first system time information and second system time information.
  • the processor is configured to determine the initial value of the pseudo-noise PN sequence according to the channel type and the first information, including: determining the initial value of the pseudo-noise PN sequence according to the first system time information and the second system time information, the first system time
  • the information is the time information represented by the time slot index, the time domain symbol index, the number configuration relationship between the time slot and the time domain symbol
  • the second system time information is represented by the frame information and/or subframe information. System time information when the second terminal device is in a synchronized state.
  • the channel type is a broadcast channel
  • the first information includes the identifier of the first terminal device and the broadcast frequency index.
  • the processor is configured to determine the initial value of the pseudo-noise PN sequence according to the channel type and the first information, including: determining the initial value of the PN sequence according to the identifier of the first terminal device and the broadcast frequency index, the broadcast frequency index represents a predetermined time period The index of the number of times that the internal broadcast channel broadcasts a message.
  • the present application provides a demodulation pilot reference signal generating device, which is used to implement the function of the first terminal device in the first aspect described above, or is used to implement the function of the second terminal device in the second aspect described above.
  • an embodiment of the present application provides a device for generating a demodulation pilot reference signal, which has the function of implementing the method for generating a demodulation pilot reference signal in any one of the foregoing aspects.
  • This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • a device for generating a demodulation pilot reference signal including: a processor and a memory; the memory is used to store computer execution instructions, and when the device for generating a demodulation pilot reference signal is running, the processor executes the The computer executes instructions stored in the memory, so that the demodulation pilot reference signal generation device executes the demodulation pilot reference signal generation method according to any one of the foregoing aspects.
  • a device for generating a demodulation pilot reference signal including: a processor; the processor is configured to couple with a memory, and after reading an instruction in the memory, execute any one of the above-mentioned aspects according to the instruction.
  • Demodulation pilot reference signal generation method including: a processor; the processor is configured to couple with a memory, and after reading an instruction in the memory, execute any one of the above-mentioned aspects according to the instruction.
  • a computer-readable storage medium stores instructions that, when run on a computer, enable the computer to execute the demodulation pilot reference of any one of the above aspects Signal generation method.
  • a computer program product containing instructions which when running on a computer, enables the computer to execute the demodulation pilot reference signal generation method of any one of the above aspects.
  • a circuit system in an eleventh aspect, includes a processing circuit configured to execute the demodulation pilot reference signal generation method according to any one of the above aspects.
  • a chip in a twelfth aspect, includes a processor, and the processor is coupled with a memory.
  • the memory stores program instructions. When the program instructions stored in the memory are executed by the processor, the demodulation guide of any one of the above aspects is realized. Frequency reference signal generation method.
  • a communication system in a thirteenth aspect, includes the first terminal device in any one of the above aspects and the second terminal device in any one of the above aspects.
  • Figure 1 is a schematic diagram of an application scenario of a V2X system provided by an embodiment of the application
  • FIG. 2 is a schematic diagram of a communication system between two terminal devices according to an embodiment of the application
  • FIG. 3 is a schematic diagram of a communication scenario between two terminal devices provided by an embodiment of the application.
  • FIG. 4 is a flowchart of a method for generating a demodulation pilot reference signal provided by an embodiment of the application
  • FIG. 5 is a flowchart of a method for generating a demodulation pilot reference signal of a data channel provided by an embodiment of the application;
  • FIG. 6 is a flowchart of a method for generating a demodulation pilot reference signal for a data channel provided by an embodiment of the application;
  • FIG. 7 is a flowchart of a method for generating a demodulation pilot reference signal of a control channel according to an embodiment of the application
  • FIG. 8 is a flowchart of a method for generating a demodulation pilot reference signal of a broadcast channel according to an embodiment of the application
  • FIG. 9 is a flowchart of a data channel information transmission method provided by an embodiment of the application.
  • FIG. 10 is a flowchart of a data channel information transmission method provided by an embodiment of the application.
  • FIG. 11 is a schematic structural diagram of an apparatus for generating a demodulation pilot reference signal of a data channel according to an embodiment of the application;
  • FIG. 12 is a schematic structural diagram of an apparatus for generating a demodulation pilot reference signal of a data channel provided by an embodiment of the application.
  • the embodiments of the present application may be applicable to systems for communication between terminal devices, such as V2X communication systems and device-to-device (D2D) systems.
  • a V2X communication system is taken as an example to describe the communication system to which the embodiments of the present application are applied.
  • the communication system includes at least two terminal devices, and the two terminal devices can directly communicate via sidelink (SL) ( Figure 1, Figure 2 and Figure 3) Both only show two terminal devices).
  • the communication system further includes access network equipment.
  • the terminal device can also communicate with the access network equipment.
  • the V2X communication system can have the following communication scenarios: vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-vehicle (vehicle to network) communication , V2N) communication, vehicle to pedestrian mobile terminal (vehicle to pedestrain, V2P) communication, etc.
  • V2V vehicle-to-vehicle
  • V2I vehicle-to-infrastructure
  • V2N vehicle-to-vehicle to network
  • V2N vehicle to pedestrian mobile terminal
  • V2P vehicle to pedestrain
  • the terminal device is mainly used to receive or send data.
  • the terminal device involved in the embodiments of the present application may be a device or a component in a device that implements terminal functions.
  • the terminal device includes, for example, but not limited to, various handheld devices with wireless communication functions, vehicle-mounted devices, Wearable devices, computing devices, or other processing devices connected to wireless modems; can also include subscriber units, cellular phones, smart phones, wireless data cards, personal digital assistants (personal digital assistants) assistant, PDA) computer, tablet computer, handheld device (handheld), laptop computer (laptop computer), machine type communication (MTC) terminal (terminal), user equipment (UE), mobile Terminal etc.
  • PDA personal digital assistants
  • MTC machine type communication
  • UE user equipment
  • the terminal device may be a component in any of the foregoing devices (for example, the terminal device may refer to a chip system in any of the foregoing devices).
  • the terminal device may also be referred to as a terminal, which is described here in a unified manner and will not be described in detail below.
  • the access network equipment involved in the embodiments of the present application is a device deployed on a wireless access network to provide wireless communication functions.
  • access network equipment may refer to equipment that communicates with wireless terminals through one or more cells on the air interface of the access network.
  • the device that realizes the function of the access network equipment may be the access network equipment or It is a device that supports the access network equipment to achieve this function (such as the chip in the access network equipment).
  • the access network device can perform attribute management on the air interface.
  • the base station equipment can also coordinate the attribute management of the air interface.
  • the access network equipment includes various forms of macro base stations, micro base stations (also called small stations), relay equipment such as relay stations or relay equipment chips, transmission reception points (TRP), and evolved network nodes (evolved Node B, eNB), next-generation network node (g Node B, gNB), evolved Node B (ng-evolved Node B, ng-eNB) connected to the next-generation core network, etc.
  • the access network equipment can be a baseband unit (BBU) and a remote radio unit (RRU), in the cloud radio access Netowrk, CRAN
  • BBU pool baseband pool
  • RRU remote radio unit
  • FIG. 1 For two terminal devices (UE1 and UE2) using sidelink communication, there may be three communication scenarios as follows: First, two terminal devices (UE1 and UE2) They are all within the coverage of the same public land mobile network (PLMN) (such as PLMN1), as shown in Figure 1.
  • PLMN public land mobile network
  • UE1 only one terminal device (UE1) is in the public land mobile network (public land mobile network, PLMN) (such as PLMN1) coverage, the other terminal device (UE2) is outside the coverage of the public land mobile network (PLMN) (PLMN1), as shown in Figure 2;
  • PLMN public land mobile network
  • PLMN1 public land mobile network
  • PLMN1 public land mobile network
  • PLMN1 public land mobile network
  • PLMN1 public land mobile network
  • FIG. 3 the dotted ellipse areas in Figure 1, Figure 2 and Figure 3 all represent the coverage of PLMN1. Since the two terminal devices use the side link for communication, the two terminal devices can communicate normally regardless of whether the two terminal devices are simultaneously in the coverage of the PLMN.
  • both terminal devices When two terminal devices communicate based on a sidelink (SL), both terminal devices need to generate a demodulation reference signal (DMRS).
  • DMRS demodulation reference signal
  • the first method for generating DMRS In the discrete Fourier transform orthogonal frequency division multiplexing (DFT-OFDM) waveform design with low peak to average ratio (PAPR),
  • DFT-OFDM discrete Fourier transform orthogonal frequency division multiplexing
  • PAPR peak to average ratio
  • the demodulation pilot reference signal is generated based on the ZC sequence.
  • the base sequence of the demodulated pilot reference signal The generation process is as follows:
  • u ⁇ ⁇ 0,1,2, ⁇ , 29 ⁇ represents the group number
  • v ⁇ ⁇ 0, 1 ⁇ represents the sequence number in the group
  • M SC represents the sequence length of the demodulation pilot reference signal
  • N ZC represents the largest prime number smaller than M SC . Represents the round-down operator.
  • Base sequence Perform a cyclic shift ⁇ to obtain the demodulation pilot reference signal, based on the base sequence
  • the process of obtaining the demodulation pilot reference signal satisfies the following formula:
  • ⁇ represents the subcarrier spacing configuration
  • ⁇ represents the cyclic shift
  • the demodulation pilot reference signal generated based on the finite values of u and v has a limited expression space.
  • the demodulation pilot reference signal needs to have a larger expression space. Therefore, the method of obtaining the demodulated pilot reference signal based on the ZC sequence cannot be applied to a scenario where a large number of terminal devices communicate.
  • the second method of generating DMRS In the cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform design, the PN sequence is used to generate the demodulation pilot reference signal.
  • the generation process satisfies the following formula:
  • r(n) represents the demodulation pilot reference signal
  • c(n) represents the PN sequence
  • x 1 (n+31) (x 1 (n+3)+x 1 (n))mod2 (8)
  • x 2 (n+31) (x 2 (n+3)+x 2 (n+2)+x 2 (n+1)+x 2 (n))mod2 (9)
  • N c 1600
  • x 1 (n) and x 2 (n) represent two m sequences (a PN sequence). Each m sequence requires 31 initial values.
  • the initial value of x 1 (n) is a fixed value.
  • c init represents the initial value of x 2 (n).
  • the initial value of x 2 (n) ie, c init ) satisfies different calculation formulas.
  • the initial value of x 2 (n) (that is, c init ) satisfies the following formula:
  • n SCID uplink demodulation pilot scrambling identity
  • the initial value of x 2 (n) (that is, c init ) satisfies the following formula:
  • N ID ⁇ 0,1,...,65535 ⁇ represents the control channel demodulation pilot scrambling configured by the higher layer Code identification. If N ID is not configured, it can be replaced by cell ID. At this time,
  • the initial value of x 2 (n) (that is, c init ) satisfies the following formula:
  • L represents the maximum number of broadcast signals in a preset time period.
  • n hf represents half-frame indication.
  • n hf 0, it means that the broadcast signal is sent in the first half of the current wireless frame;
  • n hf 1, it means that the broadcast signal is sent in the second half of the current wireless frame.
  • i SSB represents the lowest two bits of the broadcast signal times index in the period.
  • i SSB represents the lowest three bits of the broadcast signal times index in the period.
  • the initial value of the PN sequence needs to be obtained, and the initial value of the PN sequence is related to the demodulation pilot scrambling code (scrambling identifier, SCID) and cell identity configured by the higher layer. That is to say, the method of using the PN sequence to generate the demodulation pilot reference signal is mainly applied in the uplink and downlink communication scenarios between the base station and the terminal device. For two terminal devices that communicate directly, there may be one terminal device in the coverage of a public land mobile network (PLMN), and the other terminal device is in a public land mobile network (PLMN). Out of coverage, that is, the scenario shown in FIG.
  • PLMN public land mobile network
  • PLMN public land mobile network
  • the terminal devices may also exist that the terminal devices are all outside the coverage of a public land mobile network (PLMN), that is, the scenario shown in FIG. 3.
  • PLMN public land mobile network
  • the terminal device cannot obtain the demodulation pilot scrambling identifier (SCID) and cell identifier configured by the higher layer during the DMRS generation process, and therefore cannot determine the PN
  • SCID demodulation pilot scrambling identifier
  • the initial value of the sequence that is, the initial value of the m sequence (a PN sequence) of x 2 (n) cannot be obtained, and thus the DMRS cannot be generated, which affects normal communication between terminal devices.
  • the embodiment of the present application provides a method for generating a demodulation pilot reference signal, and the method is applied in a process of generating a demodulation pilot reference signal by a terminal device.
  • the side link can be used for communication between terminal devices.
  • the DMRS generation method in the embodiment of the present application includes the following steps:
  • the first terminal device determines the initial value of the PN sequence according to the channel type and the first information.
  • the channel types can include data channels, control channels, and broadcast channels.
  • the first information includes one or more of the identification of the first terminal device, system time information, and broadcast frequency index.
  • the first terminal device may obtain the identification of the first terminal device from the control information of the control channel, may also obtain the identification of the first terminal device from the check information of the control information, and may also pre-store the identification of the first terminal device.
  • the system time information includes the first system time information and the second system time information.
  • the first system time information is the time information characterized by the time slot index, the time domain symbol index, and the number configuration relationship between the time slot and the time domain symbol.
  • the system time information represents the system time information when the first terminal device and the second terminal device are in a synchronized state. Exemplarily, parameters that can characterize the system time information include but are not limited to frame numbers and subframe numbers.
  • the broadcast frequency index indicates the index of the broadcast channel broadcast message times in a predetermined time period.
  • the first terminal device refers to different first information to determine the initial value of the PN sequence.
  • the channel types include but are not limited to data channels, control channels, and broadcast channels.
  • the system time information includes the first system time information
  • the first system time information is the time represented by the time slot index, the time domain symbol index, and the number configuration relationship between the time slot and the time domain symbol. information.
  • the first information includes the identification of the first terminal device and the first system time information.
  • the first terminal device can obtain the identification of the first terminal device from the check information of the control information.
  • the specific implementation process may include the following steps:
  • the first terminal device obtains the check information of the control information from the control channel.
  • the verification information includes information used to generate the first terminal device identification.
  • the check information may be a cyclic redundancy check (cyclic redundancy check, CRC).
  • CRC check information such as the first 24 bits, carry the identity of the first terminal device. After the first terminal device demodulates and decodes the information transmitted by the control channel, the CRC check information can be obtained.
  • the first terminal device determines the identity of the first terminal device according to the verification information of the control information.
  • the identification of the first terminal device satisfies the following formula :
  • N ID represents the identity of the first terminal device
  • k represents the index of the bit used to carry the identity of the first terminal device in the cyclic redundancy check code
  • c k represents the first terminal carried by the bit with index k The part of the device ID.
  • the first terminal device obtains the identity of the first terminal device based on the check information of the control information transmitted by the control channel, so as to determine the initial value of the PN sequence.
  • the specific implementation process of S401 may include:
  • the first terminal device determines the initial value of the PN sequence according to the identifier of the first terminal device and the first system time information.
  • the first system time information is time information characterized by a time slot index, a time domain symbol index, and a number configuration relationship between time slots and time domain symbols.
  • the first DMRS is a DMRS generated by the first terminal device.
  • the second DMRS is a DMRS generated by the second terminal device.
  • one demodulation pilot reference signal may occupy one or more time domain symbols.
  • one demodulation pilot reference signal occupies one time domain symbol as an example for description.
  • formula (14) takes the first time domain symbol index among the multiple time domain symbols.
  • the first terminal device determines the initial value of the first demodulation pilot reference signal of the data channel based on the identification of the first terminal device and the first system time information, so that the data channel generated by each first terminal device can be The first demodulation pilot reference signals are different from each other. In this way, the discrimination of the first demodulation pilot reference signals corresponding to the data channels of different terminal devices is improved, thereby reducing interference between different terminal devices.
  • the number of first demodulation pilot reference signals corresponding to the data channel is variable.
  • the specific implementation process of S401 may include:
  • the first terminal device determines the initial value of the PN sequence according to the identifier of the first terminal device, the first system time information, and the configuration information of the demodulation pilot reference signal.
  • the configuration information of the demodulation pilot reference signal includes: the number of demodulation pilot reference signals contained in each transmission slot and the position of the number of demodulation pilot reference signals.
  • the configuration information may be stored in the first terminal device in advance, or may be sent to the first terminal device after being configured by the access network device.
  • the configuration information of the demodulation pilot reference signal includes one or more pilot configuration indexes. Each pilot configuration index corresponds to the number of demodulation pilot reference signals contained in each transmission slot and the position of each demodulation pilot reference signal in a transmission slot. Table 1 shows a possible implementation of configuration information.
  • n DMRS-index represents the pilot configuration index
  • l 0 represents the index of the first time domain symbol in a transmission slot.
  • Table 1 Taking one demodulation pilot reference signal occupies one time domain symbol as an example, when the pilot configuration index n DMRS-index is 0, the first demodulation pilot reference signal contained in each transmission slot The number of (ie, the demodulation pilot reference signal generated by the first terminal) is 1, and the time domain symbol index of the first demodulation pilot reference signal in one transmission slot is l 0 (that is, l 0 +0).
  • Pilot configuration index n When DMRS-index is 1, a time slot contains two first demodulation pilot reference signals, and the time domain symbols of the two contained first demodulation pilot reference signals in the time slot The indexes are expressed as: l 0 +0 and l 0 +7.
  • the pilot configuration index n DMRS-index is 3
  • the number of first demodulation pilot reference signals contained in each transmission slot is 4, and 4 first demodulation pilot reference signals are in one transmission slot
  • the time domain symbol index of is expressed as l 0 , l 0 +5, l 0 +8 and l 0 +11.
  • the first terminal device can select a pilot configuration index from the configuration information in combination with actual application requirements, and accordingly determine the number and number of first demodulation pilot reference signals contained in each transmission slot. The positions of the number of first demodulation pilot reference signals can then obtain the initial value of the PN sequence.
  • N DMRS represents the number of first demodulation pilot reference signals contained in a transmission slot
  • N index ⁇ ⁇ 0,1,2,...,N DMRS -1 ⁇ represents a transmission slot
  • the index of the first demodulation pilot reference signal in. In a frame structure, the index of the first demodulation pilot reference signal increases sequentially from left to right.
  • the first terminal device determines the initial value of the first demodulation pilot reference signal corresponding to the data channel based on the identification of the first terminal device, the first system time information, and the configuration information of the demodulation pilot reference signal.
  • different initial values correspond to different first pilot numbers.
  • the first pilot numbers are the first demodulation pilot reference signals that can be transmitted in one time slot. For example, see Table 1.
  • the PN sequence has a certain initial value
  • the corresponding n DMRS-index is 1, and accordingly, one time slot can transmit two first demodulation pilot reference signals.
  • different initial values correspond to different first demodulation pilot reference signals. It can be deduced that different first demodulation pilot reference signals correspond to different numbers of first pilots.
  • the second terminal device when the second terminal device receives a certain first demodulation pilot reference signal, it can know the first demodulation pilot reference signal.
  • the number of first pilots corresponding to a demodulation pilot reference signal is the number of first demodulation reference signals that can be transmitted in a time slot. This is equivalent to that the first demodulation pilot reference signal can implicitly indicate the number of first pilots, and there is no need to display the number of first pilots through the control information alone, which reduces the length of control information and saves spectrum resources .
  • the first information includes system time information
  • the system time information includes first system time information and second system time information.
  • the slot index, the time domain symbol index, the number configuration relationship between the slot and the time domain symbol can all represent the first system time information
  • the frame information and subframe information can both represent the first terminal device and the first terminal device.
  • the second system time when the two terminal devices are in a synchronized state.
  • the specific implementation process of S401 may include:
  • the first terminal device determines the initial value of the PN sequence according to the first system time information and the second system time information.
  • the first system time information is the time information represented by the time slot index, the time domain symbol index, the number configuration relationship between the time slot and the time domain symbol
  • the second system time information is the time information represented by the frame information and/or subframe information. Characterizing system time information when the first terminal device and the second terminal device are in a synchronized state.
  • the frame information may use the frame number
  • the subframe information may use the subframe number
  • the first terminal device determines the initial value of the PN sequence based on the system time information, at least one of the following three methods may be adopted:
  • the first terminal device determines the initial value of the PN sequence according to the first system time information and frame information (such as frame number).
  • the first terminal device determines the initial value of the pseudo-noise PN sequence according to the first system time information and subframe information (such as subframe number).
  • n f represents the first terminal device and the second terminal device The subframe number when the terminal device is in the synchronization state.
  • the first terminal device determines the initial value of the pseudo noise PN sequence according to the first system time information, frame information (such as frame number), and subframe information (such as subframe number).
  • N f represents the frame number when the first terminal device and the second terminal device are in a synchronized state
  • N f represents the subframe number when the first terminal device and the second terminal device are in a synchronized state.
  • the first terminal device determines the initial value of the PN sequence based on the system time information, and then generates the first demodulation pilot reference signal of the control channel, and sends it to the second terminal device.
  • the second terminal device receives the first demodulation pilot reference signals from the control channels of the different first terminal devices, it can learn the subframe numbers and/or frame numbers of the different first demodulation pilot reference signals. If the subframe number and/or frame number of a certain first demodulation pilot reference signal is the same as the subframe number and/or frame number of the second terminal device itself, the sender of the first demodulation pilot reference signal Synchronize with the second terminal. In this way, the second terminal device can determine the first terminal device synchronized with itself from among the plurality of first terminal devices. This improves the discrimination of the first demodulation pilot reference signal of the control channel of the synchronization source (the first terminal device), and reduces interference.
  • the first information includes the identifier of the first terminal device and the broadcast frequency index.
  • the specific implementation process of S401 may include:
  • the first terminal device determines the initial value of the PN sequence according to the identifier of the first terminal device and the broadcast frequency index.
  • the identity of the first terminal device includes the identity of the first terminal device in the synchronization channel.
  • the broadcast frequency index indicates the index of the broadcast channel broadcast message times in a predetermined time period.
  • i SSB represents the index of the number of broadcast channel broadcast messages in a predetermined time period.
  • the time period may be a pre-configured parameter, such as a parameter configured by an access network device.
  • the initial value of the PN sequence based on the broadcast frequency index is also different, and furthermore, the first demodulation pilot reference signal generated from the initial value of the PN sequence is also different.
  • the expression space of the first demodulation pilot reference signal of the broadcast channel is enlarged, the recognizability of the first demodulation pilot reference signal of the broadcast channel of different terminal devices is improved, and interference is reduced.
  • the first terminal device generates a first demodulation pilot reference signal according to the initial value of the PN sequence.
  • the m sequence is a PN sequence
  • x 1 (n) and x 2 (n) are required
  • Each m sequence requires 31 initial values.
  • the initial value of x 2 (n) can be determined by S401. According to formula (10), x 2 (n) can be obtained. After determining the two m-sequences x 1 (n) and x 2 (n), according to formulas (6) to (9), first demodulation pilot reference signals of different channel types can be obtained.
  • the first terminal device sends the first demodulation pilot reference signal to the second terminal device.
  • the second terminal device receives the first demodulation pilot reference signal sent by the first terminal device to perform channel estimation.
  • the first terminal device determines the initial value of the PN sequence according to the channel type and the first information, and then generates the first demodulation pilot reference signal according to the initial value of the PN sequence , And send the first demodulation pilot reference signal to the second terminal device.
  • the first information includes one or more of the identification of the first terminal device, system time information, and broadcast frequency index.
  • the demodulation pilot reference signal generation process is applicable to the scenario of configuring the cell identity, and the initial value of the demodulation pilot reference signal is related to the demodulation pilot scrambling code and cell identity configured by the higher layer.
  • the demodulation pilot reference signal generation method determines the initial value of the PN sequence in different channel types by combining different first information, and then generates the first demodulation pilot reference to be sent to the second terminal device Signal, and the first information includes one or more of the identification of the first terminal device, system time information, and broadcast frequency index. It can be seen that the first information used has nothing to do with the demodulation pilot scrambling code and cell ID configured by the higher layer. Even if the first terminal device and the second terminal device are not in the area where the cell ID is configured, the demodulation pilot can be generated normally. Reference signal.
  • the second terminal device in the process of sending information from the first terminal device to the second terminal device, the second terminal device, as the receiving end, needs to perform channel estimation to obtain channel information to assist in decoding and accurately obtain the information sent by the first terminal device. Information.
  • the second terminal device needs two demodulation pilot reference signals, namely the first demodulation pilot reference signal received by the second terminal device and the second demodulation pilot reference signal generated by the second terminal device signal. Referring to Figure 4, the execution steps of the second terminal device are as follows:
  • the second terminal device determines the initial value of the pseudo noise PN sequence according to the channel type and the first information.
  • the channel types can include data channels, control channels, and broadcast channels.
  • the first information includes one or more of the identification of the first terminal device, system time information, and broadcast frequency index.
  • the first terminal device is a terminal device that transmits the first demodulation pilot reference signal to the second terminal device.
  • the second terminal device may obtain the identity of the first terminal device during communication with the first terminal device, or obtain the first terminal device from sidelink control information (SCI) transmitted through the control channel.
  • SCI sidelink control information
  • the identification of the device, or the identification of the first terminal device is obtained from a cyclic redundancy check (CRC) transmitted through the control channel.
  • the system time information includes the first system time information and the second system time information.
  • the first system time information is the time information characterized by the time slot index, the time domain symbol index, and the number configuration relationship between the time slot and the time domain symbol.
  • the system time information represents the system time information when the first terminal device and the second terminal device are in a synchronized state.
  • parameters that can characterize the system time information include but are not limited to frame numbers and subframe numbers.
  • the broadcast frequency index indicates the index of the broadcast channel broadcast message times in a predetermined time period.
  • the first demodulation pilot reference signal of the data channel and the second demodulation pilot reference signal of the data channel need to be used.
  • the demodulation pilot reference signal of the corresponding channel type is used.
  • the second terminal device needs to generate a DMRS corresponding to the data channel according to the identifier of the first terminal device for channel estimation.
  • the second terminal device obtains the identity of the first terminal device according to the information transmitted by the control channel.
  • the specific implementation process includes the following steps:
  • the second terminal device obtains the check information of the control information from the control channel.
  • the verification information of the control information includes information capable of generating the identification of the first terminal device.
  • the check information may be a cyclic redundancy check (cyclic redundancy check, CRC).
  • CRC check information such as the first 24 bits, carry the identity of the first terminal device. After the second terminal device demodulates and decodes the information transmitted by the control channel, the CRC check information can be obtained.
  • the second terminal device determines the identity of the first terminal device according to the verification information of the control information.
  • the identification of the first terminal device satisfies the following formula :
  • N ID represents the identity of the first terminal device
  • k represents the index of the bit used to carry the identity of the first terminal device in the cyclic redundancy check code
  • c k represents the first terminal carried by the bit with index k The part of the device ID.
  • the second terminal device obtains the identity of the first terminal device based on the information transmitted by the control channel, so as to determine the initial value of the PN sequence.
  • the specific implementation process of S404 may include:
  • the second terminal device determines the initial value of the PN sequence according to the identifier of the first terminal device and the first system time information.
  • the first system time information is time information characterized by a time slot index, a time domain symbol index, and a number configuration relationship between time slots and time domain symbols.
  • the specific form of the identification of the first terminal device adopted by the second terminal device (receiving terminal) needs to be consistent with the specific form of the identification of the first terminal device adopted by the first terminal device (ie, the sending terminal) in S4011.
  • the initial value of the PN sequence also needs to satisfy formula (14).
  • the second terminal device determines the initial value of the PN sequence based on the identifier of the first terminal device and the first system time information, and then provides information support for the local terminal to generate the second demodulation pilot reference signal.
  • the second terminal device will receive one or more first demodulation pilot reference signals to form a first demodulation pilot reference signal set.
  • the second terminal device needs to combine the configuration information to generate the second demodulation pilot reference signal corresponding to the data channel.
  • the required first information includes the identification of the first terminal device, the first system time information, and the configuration of the demodulation pilot reference signal
  • the specific implementation process of S404 may include:
  • the second terminal device determines the initial value of the PN sequence according to the identifier of the first terminal device, the first system time information, and the configuration information of the demodulation pilot reference signal.
  • the first system time information is time information characterized by a time slot index, a time domain symbol index, and a number configuration relationship between time slots and time domain symbols.
  • the configuration information of the demodulation pilot reference signal includes: the number of first demodulation pilot reference signals contained in each transmission slot and the position of the number of first demodulation pilot reference signals.
  • the configuration information of the demodulation pilot reference signal may be network configuration, or information pre-stored by the second terminal device.
  • the specific form of the identification of the first terminal device used in S4042 still needs to be consistent with the specific form of the identification of the first terminal device used in S4012.
  • the second terminal device Since the second terminal device failed to obtain the pilot configuration index used by the first terminal device when performing S4012, the second terminal device first generates the second demodulation pilot reference signal corresponding to all the pilot configuration indexes to form The second demodulation pilot reference signal set. For each second demodulation pilot reference signal, the initial value of its PN sequence also needs to satisfy formula (15).
  • the second terminal device determines all possible initial values of the second demodulation pilot reference signal based on the identification of the first terminal device, the first system time information, and the configuration information of the demodulation pilot reference signal, and then is the local terminal Generate all possible second demodulation pilot reference signals to provide information support.
  • the first demodulation pilot reference signal includes the demodulation pilot reference signal corresponding to the control channel.
  • the second terminal device generates the second demodulation pilot reference signal corresponding to the control channel
  • the required first information includes system time information
  • the system time information includes first system time information and second system time information.
  • the slot index, the time domain symbol index, the number configuration relationship between the slot and the time domain symbol can all represent the first system time information
  • the frame information and subframe information can both represent the first terminal device and the first terminal device.
  • the second terminal device determines the initial value of the PN sequence according to the first system time information and the second system time information.
  • the first system time information is the time information represented by the time slot index, the time domain symbol index, the number configuration relationship between the time slot and the time domain symbol
  • the second system time information is the time information represented by the frame information and/or subframe information. Characterizing system time information when the first terminal device and the second terminal device are in a synchronized state.
  • the method used in S4043 must be consistent with the method used in S4013. For example, if the initial value of the PN sequence is determined based on the frame number in S4013 (that is, mode 1), the frame number also needs to be used to determine the initial value of the PN sequence in S4043. In addition, the initial value of the PN sequence also needs to satisfy formula (16).
  • the second terminal device determines the initial value of the second demodulation pilot reference signal of the control channel based on the system time information, and then provides information support for the local end to generate the second demodulation pilot reference signal.
  • the first demodulation pilot reference signal includes the demodulation pilot reference signal corresponding to the broadcast channel.
  • the second terminal device generates the second demodulation pilot reference signal corresponding to the broadcast channel, and the required first information includes the identification of the first terminal device and the broadcast times index. See FIG. 8, the specific implementation process of S404 may include :
  • the second terminal device determines the initial value of the pseudo noise PN sequence according to the identifier of the first terminal device and the broadcast frequency index.
  • the identifier of the first terminal device includes the identifier of the first terminal device on the synchronization channel.
  • the broadcast frequency index indicates the index of the broadcast channel broadcast message times in a predetermined time period.
  • the second terminal device pre-acquires the maximum number of broadcast messages sent in each time period, or the second terminal device blindly checks the maximum number of broadcast messages sent in each time period.
  • the specific form of the identification of the first terminal device used in S4044 still needs to be consistent with the specific form of the identification of the first terminal device used in S4014.
  • the initial value of the PN sequence also needs to satisfy formula (19).
  • the second terminal device determines the initial value of the second demodulation pilot reference signal of the broadcast channel based on the identification of the first terminal device and the broadcast times index, and then provides information support for the local end to generate the second demodulation pilot reference signal.
  • the second terminal device generates a second demodulation pilot reference signal according to the initial value of the PN sequence.
  • the second terminal device needs to be consistent with the process of generating the first demodulation pilot reference signal by the first terminal device.
  • the second demodulation pilot reference signal is a signal generated based on the initial value of the PN sequence determined by S40412, S4043, and S4044, it can be directly used for channel estimation; if the second demodulation pilot reference is The signal is a signal generated based on the initial value of the PN sequence determined in S4042. It is necessary to calculate the correlation between the first demodulation pilot reference signal and the second demodulation pilot reference signal under each pilot configuration index. The obtained correlation selects the pilot configuration index, and the second demodulation pilot reference information corresponding to the pilot configuration index is used for channel estimation, so as to improve the accuracy of channel estimation. Referring to FIG. 6, the process for the second terminal device to select the second demodulation pilot reference signal for channel estimation is as follows:
  • the second terminal device determines the correlation between the first demodulation pilot reference signal in the first time slot and one or more second demodulation pilot reference signals in the first time slot .
  • the second terminal device determines the time-frequency resource occupied by the data channel according to the pre-acquired control information, and then randomly determines the position of the first time slot from the time-frequency resource occupied by the data channel, and in the first time slot, Calculate the correlation between the first demodulation pilot reference signal and one or more second demodulation pilot reference signals.
  • the configuration information of the demodulation pilot reference signal can indicate the position of each demodulation pilot reference signal in a time slot.
  • the configuration information of the demodulation pilot reference signal if there is only one column of the first demodulation pilot reference signal in the data channel, the column of the first demodulation pilot reference signal must be mapped to the first pilot of a time slot Symbol.
  • a column of demodulation pilot reference signals refers to one or more demodulation pilot reference signals along the frequency axis.
  • the first column of first demodulation pilot reference signals refers to one or more first demodulation pilot reference signals on the first pilot symbol in a time slot.
  • a pilot symbol refers to one or more time-domain symbols to which a demodulation pilot reference signal is mapped, which is described here in a unified manner.
  • the first demodulation pilot reference signal exists on the first pilot symbol of a time slot.
  • the index l is the first time domain symbol 0 are the presence of a first demodulation reference signal.
  • the second terminal device may use at least one of the following methods to calculate the correlation between the first demodulation pilot reference signal and the second demodulation pilot reference signal:
  • Method 1 When there is only one column or two or more columns of the first demodulation pilot reference signal in the data channel, calculate the difference between the first column of the first demodulation pilot reference signal and the first column of the second demodulation pilot reference signal The correlation between.
  • the first demodulation pilot reference signal on the single frequency domain unit in the first column and the first demodulation pilot reference signal on the single frequency domain unit in the first column are calculated.
  • the multiple calculated correlations are accumulated to obtain the correlation between the first column of first demodulation pilot reference signals and the first column of demodulation pilot reference signals.
  • the correlation between the first demodulation pilot reference signal and one or more second demodulation pilot reference signals satisfies the following formula:
  • h i represents the first demodulation pilot reference signal of the i-th frequency domain unit on the first pilot symbol of a slot, i ⁇ 1,2,...,I-1,I ⁇ , i Indicates the index of the frequency domain unit, and I is a value determined according to the bandwidth of the data channel and the interval of the frequency domain unit.
  • each pilot symbol corresponds to a demodulation pilot reference signal.
  • the frequency domain unit may specifically refer to frequency domain subcarriers.
  • n DMRS-index indicates the pilot configuration index of the first demodulation pilot reference signal in the configuration information.
  • the configuration information with the pilot configuration index being n DMRS-index is used to indicate: when the pilot configuration index is n DMRS-index , Correspondence between the first demodulation pilot reference signal and time domain symbols in a time slot.
  • the second terminal device can obtain the second demodulation pilot for channel estimation only based on the correlation between the first demodulation pilot reference signal in the first column and the second demodulation pilot reference signal in the first column.
  • Frequency reference signal the amount of calculation is small, and the accuracy of channel estimation is improved.
  • Manner 2 The second terminal device calculates all possible correlations between the first demodulation pilot reference signal and the second demodulation pilot reference signal.
  • the first demodulation pilot reference signal includes the demodulation pilot reference signal on any pilot symbol in the first time slot in the first demodulation pilot reference signal set
  • the second demodulation pilot reference signal includes the demodulation pilot reference signal on the same pilot symbol as the first demodulation pilot reference signal in the second demodulation pilot reference signal set.
  • the first demodulation pilot reference signal set represents the set of demodulation pilot reference signals corresponding to the data channel received by the receiving end
  • the second demodulation pilot reference signal set represents the demodulation generated based on the configuration information of the pilot.
  • the correlation between the first demodulation pilot reference signal and one or more second demodulation pilot reference signals can satisfy the following formula:
  • h i,l represents the first demodulation pilot reference signal of the i-th frequency domain unit on the l-th time-domain symbol of a slot
  • i ⁇ 1,2,...,I-1,I ⁇ I represents the index of the frequency domain unit
  • I is a value determined according to the bandwidth of the data channel and the interval of the frequency domain unit.
  • Each pilot symbol corresponds to a demodulation pilot reference signal.
  • the frequency domain unit may specifically refer to frequency domain subcarriers.
  • n DMRS-index indicates the pilot configuration index of the first demodulation pilot reference signal in the configuration information.
  • the configuration information with the pilot configuration index being n DMRS-index is used to indicate: when the pilot configuration index is n DMRS-index , Correspondence between pilot symbols and time domain symbols where the first demodulation pilot reference signal is located in a time slot.
  • the correlation between the first demodulation pilot reference signal and one or more second demodulation pilot reference signals can also satisfy the following formula:
  • h i,l represents the first demodulation pilot reference signal of the i-th frequency domain unit on the l-th time-domain symbol of a slot
  • i ⁇ 1,2,...,I-1,I ⁇ I represents the index of the frequency domain unit
  • I is a value determined according to the bandwidth of the data channel and the interval of the frequency domain unit.
  • Each pilot symbol corresponds to a demodulation pilot reference signal.
  • the frequency domain unit may specifically refer to frequency domain subcarriers.
  • n DMRS-index indicates the pilot configuration index of the first demodulation pilot reference signal in the configuration information.
  • the configuration information with the pilot configuration index being n DMRS-index is used to indicate: when the pilot configuration index is n DMRS-index , Correspondence between pilot symbols and time domain symbols where the first demodulation pilot reference signal is located in a time slot.
  • the second terminal device calculates the correlation between each first demodulation pilot reference signal and the second demodulation pilot reference signal, improves the accuracy of the correlation calculation result, and then accurately selects the pilot configuration index to obtain The second demodulation pilot reference signal used for channel estimation.
  • S407 Determine a second demodulation pilot reference signal used for channel estimation according to the correlation between the first demodulation pilot reference signal and one or more second demodulation pilot reference signals.
  • the second demodulation pilot reference signal used for channel estimation includes the second demodulation pilot reference signal with the greatest correlation.
  • the second demodulation pilot reference signal used for channel estimation satisfies the following formula:
  • the second demodulation pilot reference signal used for channel estimation satisfies the following formula:
  • the second demodulation pilot reference signal used for channel estimation satisfies the following formula:
  • the second terminal device selects the pilot configuration index with the highest correlation calculation result, and uses the second demodulation pilot reference signal corresponding to the pilot configuration index with the highest correlation for channel estimation, so as to improve the accuracy of channel estimation .
  • the method includes the following steps:
  • S901 The first terminal device performs channel coding on the information to be sent.
  • the first terminal device generates a first demodulation pilot reference signal corresponding to the data channel.
  • the first terminal device may perform S901 and then S902, or may perform S902 and then S901, or perform S901 and S902 at the same time.
  • the sequence of S901 and S902 is not limited here.
  • the first terminal device maps the channel-coded information to be sent and the first demodulation pilot reference signal corresponding to the data channel to the time domain resource.
  • the time domain symbol index represents the position of 0.
  • the first terminal device performs fast Fourier transform (fast fourier transform, FFT) and framing processing on the information of the time domain resource.
  • FFT fast fourier transform
  • a header and a tail are added to the front and back of the FFT processed data and encapsulated into a frame, so that the second terminal device can recognize the start and end of the frame from the received bit stream according to the markers of the header and the tail.
  • the first terminal device sends the information encapsulated as a frame to the second terminal device.
  • the second terminal device receives the information encapsulated as a frame from the first terminal device.
  • the second terminal device performs deframing processing and inverse fast Fourier transform (IFFT) on the information that has been encapsulated as a frame.
  • IFFT inverse fast Fourier transform
  • the second terminal device performs channel separation on the information after the inverse fast Fourier transform, and obtains the first demodulation pilot reference signal and data information.
  • the second terminal device generates a second demodulation pilot reference signal corresponding to the data channel.
  • the second terminal device may first perform S907 and then S908, or may first perform S908 and then S907, or simultaneously perform S907 and S908.
  • the sequence of S907 and S908 is not limited here.
  • the second terminal device performs channel estimation according to the received first demodulation pilot reference signal and the generated second demodulation pilot reference signal, and obtains a channel estimation result.
  • the second terminal device decodes the received data information according to the channel estimation result.
  • the first terminal device and the second terminal device can communicate directly, there is no limitation of the expression space of the demodulation pilot reference signal, and the discrimination between different demodulation pilot reference signals can be improved.
  • the first terminal device sends information (the information carries the first demodulation pilot reference signal) and the second terminal device receives and decodes the information.
  • the information process is elaborated in detail. Referring to Figure 10, the method includes the following steps:
  • the first terminal device performs channel coding on the information to be sent.
  • the first terminal device generates a first demodulation pilot reference signal corresponding to the data channel.
  • the first terminal device maps the channel-coded information to be sent and the first demodulation pilot reference signal corresponding to the data channel to time domain resources.
  • the number of first demodulation pilot reference signals contained in one transmission time slot is 2, and two first demodulation pilots
  • the position where the reference signal is mapped to the time domain resource is the position where the time domain symbol index in each transmission slot is expressed as l 0 and l 0 +7.
  • the second terminal device generates a second demodulation pilot reference signal corresponding to the data channel.
  • the second terminal device may first execute S1006 and then execute S1007, or may first execute S1007 and then execute S1006, or execute S1006 and S1007 simultaneously.
  • the sequence of S1006 and S1007 is not limited here.
  • the second terminal device performs blind detection on the information after the inverse fast Fourier transform according to the generated second demodulation pilot reference signal, and obtains the pilot configuration index used by the first terminal device.
  • the second terminal device performs channel separation on the information after the inverse fast Fourier transform according to the pilot configuration index adopted by the first terminal device, and obtains the first demodulation pilot reference signal and data information.
  • S1010 Perform channel estimation according to the received first demodulation pilot reference signal and the second demodulation pilot reference signal corresponding to the pilot configuration index, and obtain a channel estimation result.
  • the first terminal device and the second terminal device can communicate directly. Even if the number of demodulation pilot reference signals in the data channel is variable, the second terminal device can determine the pilot used by the first terminal device. Frequency configuration index, the second demodulation pilot reference signal corresponding to the same pilot configuration index is used for channel estimation to improve the accuracy of channel estimation. In addition, the control information does not need to carry quantitative information, which reduces the length of the control information and saves spectrum resources.
  • the first terminal device and the second terminal device include hardware structures and/or software modules corresponding to each function.
  • the embodiments of the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Those skilled in the art can use different methods for each specific application to implement the described functions, but such implementation should not be considered as going beyond the scope of the technical solutions of the embodiments of the present application.
  • the embodiment of the present application can divide the functional units of the demodulation pilot reference signal generating apparatus according to the above method examples.
  • each functional unit can be divided corresponding to each function, or two or more functions can be integrated into one processing. Unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit. It should be noted that the division of units in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.
  • FIG. 11 shows a schematic block diagram of a demodulation pilot reference signal generating apparatus provided in an embodiment of the present application.
  • the demodulation pilot reference signal generating device 1100 may exist in the form of software, or may be a device, or a component in the device (such as a chip system).
  • the demodulation pilot reference signal generating device 1100 includes: a processing unit 1102 and a communication unit 1103.
  • the communication unit 1103 can also be divided into a sending unit (not shown in FIG. 11) and a receiving unit (not shown in FIG. 11).
  • the sending unit is used to support the demodulation pilot reference signal generating device 1100 to send information to other network elements.
  • the receiving unit is configured to support the demodulation pilot reference signal generating device 1100 to receive information from other network elements.
  • the processing unit 1102 may be used to support the device 1100 to perform S401 and S402 in FIG. 4, and/or be used herein Other processes of the described scheme.
  • the communication unit 1103 is used to support communication between the device 1100 and other network elements (for example, a second terminal device). For example, the communication unit is used to support the device 1100 to perform S403 shown in FIG. 4 and/or other processes used in the solution described herein.
  • the processing unit 1102 may be used to support the device 1100 to perform S404, S405, and/or as shown in FIG. 4 Other procedures used in the scenarios described herein.
  • the communication unit 1103 is used to support communication between the device 1100 and other network elements (for example, the first terminal device). For example, the communication unit is used to support the device 1100 to perform S403 shown in FIG. 4 and/or other processes used in the solution described herein.
  • the demodulation pilot reference signal generating device 1100 may further include a storage unit 1101 for storing program codes and data of the device 1100, and the data may include but not limited to original data or intermediate data.
  • the processing unit 1102 may be a processor or a controller, for example, a CPU, a general-purpose processor, DSP, ASIC, FPGA or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute various exemplary logical blocks, modules and circuits described in conjunction with the disclosure of this application.
  • the processor may also be a combination of computing functions, for example, a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on.
  • the communication unit 1103 may be a communication interface, a transceiver, or a transceiver circuit, etc., where the communication interface is a general term.
  • the communication interface may include multiple interfaces, for example, may include: an interface between the terminal and the terminal and/ Or other interfaces.
  • the storage unit 1101 may be a memory.
  • the processing unit 1102 is a processor
  • the communication unit 1103 is a communication interface
  • the storage unit 1101 is a memory
  • the demodulation pilot reference signal generating apparatus 1200 involved in the embodiment of the present application may be as shown in FIG. 12.
  • the device 1200 includes a processor 1202, a transceiver 1203, and a memory 1201.
  • the transceiver 1203 may be an independently set transmitter, which may be used to send information to other devices, and the transceiver may also be an independently set receiver, which is used to receive information from other devices.
  • the transceiver may also be a component that integrates the functions of sending and receiving information. The embodiment of the present application does not limit the specific implementation of the transceiver.
  • the demodulation pilot reference signal generating apparatus 1200 may further include a bus 1204.
  • the transceiver 1203, the processor 1202, and the memory 1201 may be connected to each other through a bus 1204; the bus 1204 may be a Peripheral Component Interconnect (PCI) bus or an extended industry standard architecture (Extended Industry Standard Architecture, for short) EISA) bus, etc.
  • the bus 1204 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is used to represent in FIG. 12, but it does not mean that there is only one bus or one type of bus.
  • a person of ordinary skill in the art can understand that: in the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software it can be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server, or data center via wired (for example, coaxial cable, optical fiber, Digital Subscriber Line (DSL)) or wireless (for example, infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a digital video disc (Digital Video Disc, DVD)), or a semiconductor medium (for example, a solid state disk (Solid State Disk, SSD)) )Wait.
  • a magnetic medium for example, a floppy disk, a hard disk, a magnetic tape
  • an optical medium for example, a digital video disc (Digital Video Disc, DVD)
  • a semiconductor medium for example, a solid state disk (Solid State Disk, SSD)
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical or other forms.
  • the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network devices (for example, Terminal). Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of the present application may be integrated into one processing unit, or each functional unit may exist independently, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit may be implemented in the form of hardware, or may be implemented in the form of hardware plus software functional units.

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

Abstract

L'invention concerne un procédé et un appareil permettant de produire un signal de référence de démodulation, ceux-ci se rapportant au domaine technique des communications, en particulier le V2X, la conduite intelligente, les véhicules connectés intelligents, etc., et pouvant résoudre le problème de l'incapacité d'un appareil terminal de communication à communiquer normalement lorsqu'il n'y a pas de couverture réseau. Le procédé comprend les étapes suivantes : un premier appareil terminal détermine une valeur initiale d'une séquence de pseudobruit (PN) selon un type de canal et des premières informations, et produit un premier signal de référence de démodulation selon la valeur initiale de la séquence de PN, puis il envoie le premier signal de référence de démodulation à un deuxième appareil terminal, les premières informations comprenant un ou plusieurs éléments parmi un identifiant du premier appareil terminal, des informations de temps système et un indice de fréquence de diffusion. Le procédé est appliqué au processus de production, par un appareil terminal, d'un signal de référence de démodulation.
PCT/CN2020/081512 2019-04-02 2020-03-26 Procédé et appareil de production de signal de référence de démodulation WO2020200056A1 (fr)

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CN114726491A (zh) * 2021-01-06 2022-07-08 中兴通讯股份有限公司 Dmrs配置方法、电子设备和存储介质
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