CN117294565A - Method and apparatus for determining cyclic prefix length of symbols of reference signal - Google Patents

Method and apparatus for determining cyclic prefix length of symbols of reference signal Download PDF

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Publication number
CN117294565A
CN117294565A CN202210690218.9A CN202210690218A CN117294565A CN 117294565 A CN117294565 A CN 117294565A CN 202210690218 A CN202210690218 A CN 202210690218A CN 117294565 A CN117294565 A CN 117294565A
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China
Prior art keywords
subcarrier spacing
reference signal
cyclic prefix
symbols
prefix length
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CN202210690218.9A
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Chinese (zh)
Inventor
胡远洲
王磊
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN202210690218.9A priority Critical patent/CN117294565A/en
Priority to PCT/CN2023/087823 priority patent/WO2023241190A1/en
Publication of CN117294565A publication Critical patent/CN117294565A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2676—Blind, i.e. without using known symbols
    • H04L27/2678—Blind, i.e. without using known symbols using cyclostationarities, e.g. cyclic prefix or postfix
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated

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

Abstract

The application provides a method and a device for determining the cyclic prefix length of a symbol of a reference signal, and relates to the technical field of wireless communication, wherein the method comprises the following steps: acquiring a first subcarrier spacing and a second subcarrier spacing, wherein the first subcarrier spacing is used for transmitting data on a first time unit, and the second subcarrier spacing is used for transmitting a reference signal on the first time unit, and the first subcarrier spacing is larger than the second subcarrier spacing; acquiring a first number, wherein the first number is the number of symbols of a reference signal to be transmitted on a first time unit; the cyclic prefix length of the symbols of the reference signal is determined based on the first subcarrier spacing, the second subcarrier spacing, and the first number. The method for determining the cyclic prefix length of the reference signal symbol can enable the reference signal symbol to resist larger time bias, flexibly adapt to different time bias scenes, ensure orthogonality of the reference signals sent by different terminal devices, and improve channel estimation and demodulation performance.

Description

Method and apparatus for determining cyclic prefix length of symbols of reference signal
Technical Field
Embodiments of the present application relate to the field of wireless communication technology, and more particularly, to a method and apparatus for determining a cyclic prefix length of a symbol of a reference signal.
Background
In a non-orthogonal multiple access (NoMA) transmission system, multiple terminal devices can simultaneously transmit data and reference signals to a base station. Each terminal device may spread the data or reference signal with a spreading sequence (spreading sequence). Wherein the spreading sequences employed by different terminal devices may be orthogonal or non-orthogonal. The base station device may perform channel estimation using the reference signal to obtain a channel response of the terminal device, and may cancel interference between the terminal devices by using a successive interference cancellation (successive interference cancellation, SIC) technique to improve demodulation performance.
At present, when a plurality of terminal devices transmit by adopting a NoMA technology, due TO the difference of time domain offsets (TO) of different terminal devices, when the time domain offset (or called time offset) of the terminal devices is greater than a Cyclic Prefix (CP), the symbols of reference signals and the symbols of data received by the base station device are incomplete and are interfered by adjacent symbols, so that orthogonality between reference signals sent by different terminal devices is damaged, and channel estimation and demodulation performance are affected.
Therefore, how to resist the time domain offset of the terminal device during the transmission of the non-orthogonal multiple access has become a technical problem to be solved in the art.
Disclosure of Invention
The embodiment of the application provides a method and a device for determining the cyclic prefix length of a reference signal symbol, which can enable the reference signal symbol to resist large time bias, flexibly adapt to different time bias scenes, ensure orthogonality of reference signals sent by different terminal devices and improve channel estimation and demodulation performance.
In a first aspect, a method for determining a cyclic prefix length of a symbol of a reference signal is provided, comprising: acquiring a first subcarrier spacing and a second subcarrier spacing, wherein the first subcarrier spacing is used for transmitting data on a first time unit, and the second subcarrier spacing is used for transmitting a reference signal on the first time unit, and the first subcarrier spacing is larger than the second subcarrier spacing; acquiring a first number, wherein the first number is the number of symbols of a reference signal on the first time unit; the cyclic prefix length of the symbols of the reference signal is determined based on the first subcarrier spacing, the second subcarrier spacing, and the first number.
It should be understood that in this application, the symbols of the reference signals may be referred to as reference signal symbols.
In the embodiment of the present application, the above "the first subcarrier spacing is used for transmitting data on the first time unit" may be understood as: the first subcarrier spacing is a subcarrier spacing used when transmitting data over the first time unit; the above "the second subcarrier spacing is used for transmitting the reference signal on the first time unit" can be understood as: the second subcarrier spacing is a subcarrier spacing used when transmitting the reference signal on the first time unit.
In the embodiment of the application, the terminal equipment firstly acquires the first subcarrier interval used for transmitting data, the second subcarrier interval used for transmitting the reference signal and the number of the reference signal symbols on the first time unit, determines the cyclic prefix length of the reference signal symbols according to the first subcarrier interval, the second subcarrier interval and the first number, and can obtain the cyclic prefix lengths of different reference signal symbols by adjusting the corresponding relation between the first subcarrier interval and the second subcarrier interval, namely configuring the values of the first subcarrier interval and the second subcarrier interval, so as to realize the effect of resisting larger time bias and improve the channel estimation and demodulation performance.
Optionally, in one possible implementation, the acquiring the first subcarrier spacing and the second subcarrier spacing includes: acquiring a first subcarrier spacing and a first ratio, wherein the first ratio comprises a ratio of the first subcarrier spacing to a second subcarrier spacing or a ratio of the second subcarrier spacing to the first subcarrier spacing; and determining a second subcarrier spacing according to the first subcarrier spacing and the first ratio.
In this embodiment of the present application, the first ratio may be a predefined value, or may be a value that is sent by the base station device to the terminal device through signaling.
Optionally, in one possible implementation, determining the cyclic prefix length of the symbols of the reference signal according to the first subcarrier spacing, the second subcarrier spacing, and the first number includes: a cyclic prefix length of the symbols of the reference signal is determined based on the first ratio and the first number.
In this embodiment of the present application, the terminal device first obtains a first subcarrier interval for sending data, a second subcarrier interval for sending a reference signal, and the number of symbols of the reference signal on the first time unit, and determines the cyclic prefix length of the symbols of the reference signal according to the first ratio and the first number, and by adjusting the first ratio, (for example, by setting the ratio of the first subcarrier interval to the second subcarrier interval, and without changing the first subcarrier interval, that is, without changing the length of the symbols of the data and the duration of the first time unit), the cyclic prefix length of the symbols of the reference signal can be increased to a certain extent to resist large time offset, thereby improving channel estimation and demodulation performance. Meanwhile, the terminal equipment can configure the ratio of the first subcarrier interval to the second subcarrier interval appropriately according to different time bias scenes, so that different time bias scenes can be flexibly configured.
Optionally, determining the cyclic prefix length of the symbols of the reference signal according to the first subcarrier spacing, the second subcarrier spacing, and the first number includes: acquiring a first corresponding relation, wherein the first corresponding relation is used for indicating a corresponding relation between a first parameter set and a first cyclic prefix length, and the first parameter set comprises a first number and at least two of the following parameters: a first subcarrier spacing, a second subcarrier spacing, a first ratio;
and determining the cyclic prefix length of the symbol of the reference signal according to the first cyclic prefix length corresponding to the first parameter set.
In one implementation, the method for determining a cyclic prefix length of a symbol of a reference signal further includes: and acquiring first information, wherein the first information is used for indicating the first corresponding relation.
Optionally, in one implementation, determining the cyclic prefix length of the symbols of the reference signal according to the first subcarrier spacing, the second subcarrier spacing, and the first number includes: acquiring a second corresponding relation, wherein the second corresponding relation is used for indicating a corresponding relation between a second parameter set and a first cyclic prefix length and a second cyclic prefix length, and the second parameter set comprises a first number and at least two of the following parameters: a first subcarrier spacing, a second subcarrier spacing, a first ratio;
And according to the second corresponding relation, determining the first cyclic prefix length corresponding to the second parameter set as the cyclic prefix length of the symbol of the reference signal, and determining the second cyclic prefix length corresponding to the second parameter set as the cyclic prefix length of the symbol of the data.
In one implementation, the method for determining a cyclic prefix length of a symbol of a reference signal further includes: and acquiring second information, wherein the second information is used for indicating the second corresponding relation.
Optionally, in one possible implementation, determining the cyclic prefix length of the symbols of the reference signal according to the first subcarrier spacing, the second subcarrier spacing, and the first number includes: obtaining a third corresponding relation, wherein the third corresponding relation is used for indicating the corresponding relation between a plurality of parameter sets and a plurality of first cyclic prefix lengths, and each parameter set comprises a symbol number value and at least two parameters: the ratio of the two subcarrier spacing values may be expressed as a ratio of a first subcarrier spacing to a second subcarrier spacing or a ratio of a second subcarrier spacing to a first subcarrier spacing;
According to a third correspondence, determining a cyclic prefix length corresponding to a first parameter set from the plurality of first cyclic prefix lengths as a cyclic prefix length of a symbol of the reference signal, wherein the first parameter set includes a number of symbols having a value of the number of symbols of the reference signal, and the first parameter set includes at least two parameters: a value of the first subcarrier spacing, a value of the second subcarrier spacing, a first ratio.
Optionally, in one possible implementation, determining the cyclic prefix length of the symbols of the reference signal according to the first subcarrier spacing, the second subcarrier spacing, and the first number includes: acquiring a fourth corresponding relation, wherein the fourth corresponding relation is used for indicating a corresponding relation between a plurality of parameter sets, a plurality of first cyclic prefix lengths and a plurality of second cyclic prefix lengths, and each parameter set comprises a symbol number value and at least two parameters: the ratio of the two subcarrier spacing values may be expressed as a ratio of a first subcarrier spacing to a second subcarrier spacing or a ratio of a second subcarrier spacing to a first subcarrier spacing;
According to a fourth correspondence, determining a cyclic prefix length corresponding to a first parameter set from the plurality of first cyclic prefix lengths as a cyclic prefix length of a symbol of a reference signal, determining a cyclic prefix length corresponding to a first parameter set from the plurality of second cyclic prefix lengths as a cyclic prefix length of a symbol of data, the first parameter set including a number of symbols having a value of the number of symbols of the reference signal, and the first parameter set including at least two of: a value of the first subcarrier spacing, a value of the second subcarrier spacing, a first ratio. It should be understood that in this application, the symbols of data may be referred to as data symbols.
Optionally, in one possible implementation manner, the method for determining a cyclic prefix of a symbol of the reference signal further includes: third information is acquired, the third information being indicative of the first number.
Optionally, in one possible implementation manner, the method for determining a cyclic prefix of a symbol of the reference signal further includes: acquiring fourth information, wherein the fourth information is used for indicating a first ratio corresponding to the first number or a first subcarrier interval and a second subcarrier interval corresponding to the first number; the cyclic prefix length of the symbol of the reference signal is determined according to the third information and the fourth information, or the cyclic prefix length of the symbol of the reference signal and the cyclic prefix length of the symbol of the data are determined according to the third information and the fourth information.
Specifically, in the embodiment of the present application, the first ratio includes one or more of the following: 5/4, 4/3, 3/2, 5/3, 2, 25/12, 9/4, 5/2, 8/3, 3.
According to the value of the first ratio provided by the embodiment of the application, the cyclic prefix lengths of the symbols of different reference signals can be obtained by configuring the value of different first ratios, so that different time bias scenes can be flexibly configured, and the effect of resisting time bias is realized. Meanwhile, compared with the ratio of the first subcarrier spacing to the second subcarrier spacing in the prior art, the first ratio of the present application may be fractional, so that the cyclic prefix length of the symbol of the reference signal may be increased to a certain extent.
Alternatively, in one possible implementation, the reference signal may be a ZC sequence, and the length of the reference signal is proportional to a first value, the number of roots of the ZC sequence is proportional to the first value, the number of cyclic shifts of the reference signal is proportional to the first value, wherein the first value includes a ratio of the first subcarrier spacing to the second subcarrier spacing.
In this embodiment of the present application, the length of the reference signal may be configured to be proportional to the ratio of the first subcarrier spacing to the second subcarrier spacing, the reference signal is a ZC sequence, the number of roots of the ZC sequence is proportional to the ratio of the first subcarrier spacing to the second subcarrier spacing, and the number of cyclic shifts of the reference signal is proportional to the ratio of the first subcarrier spacing to the second subcarrier spacing. Therefore, the number of symbols of orthogonal or quasi-orthogonal reference signals can be increased, the probability of collision when a plurality of terminal devices send the reference signals is reduced, and further the channel estimation and demodulation performance is improved.
In a second aspect, there is provided an apparatus for determining a cyclic prefix length of a symbol of a reference signal, the apparatus comprising:
an acquisition unit configured to acquire a first subcarrier spacing for transmitting data over a first time unit and a second subcarrier spacing for transmitting a reference signal over the first time unit, wherein the first subcarrier spacing is greater than the second subcarrier spacing;
the acquisition unit is further configured to acquire a first number, where the first number is a number of symbols of the reference signal on the first time unit;
a processing unit for determining a cyclic prefix length of the symbols of the reference signal based on the first subcarrier spacing, the second subcarrier spacing and the number of symbols of the reference signal.
In the embodiment of the present application, the terminal device first obtains a first subcarrier interval for sending data, a second subcarrier interval for sending a reference signal, and the number of symbols of the reference signal on the first time unit, determines the cyclic prefix length of the symbols of the reference signal according to the first subcarrier interval, the second subcarrier interval, and the number of symbols of the reference signal on the first time unit, and adjusts the corresponding relationship between the three, that is, configures the values of the first subcarrier interval and the second subcarrier interval, so as to obtain the cyclic prefix lengths of the symbols of different reference signals, thereby achieving the effect of resisting a larger time offset, and improving the channel estimation and demodulation performance.
Optionally, in one possible implementation manner, the obtaining unit is further configured to obtain a first subcarrier spacing and the first ratio, where the first ratio includes a ratio of the first subcarrier spacing to the second subcarrier spacing, or a ratio of the second subcarrier spacing to the first subcarrier spacing; the processing unit is further configured to determine a second subcarrier spacing according to the first ratio.
In this embodiment of the present application, the first ratio may be a predefined value, or may be a value that is sent by the base station device to the terminal device through signaling.
Optionally, in one possible implementation, the processing unit is further configured to determine a cyclic prefix length of the symbols of the reference signal according to the first ratio and the first number.
In this embodiment of the present application, the terminal device first obtains a first subcarrier interval for sending data, a second subcarrier interval for sending a reference signal, and the number of symbols of the reference signal on the first time unit, and determines the cyclic prefix length of the symbols of the reference signal according to the first ratio and the first number, and by adjusting the first ratio, (for example, by setting the ratio of the first subcarrier interval to the second subcarrier interval, and without changing the first subcarrier interval, that is, without changing the length of the symbols of the data and the length of the symbols in the first time unit), the cyclic prefix length of the symbols of the reference signal can be increased to a certain extent to resist large time offset, thereby improving channel estimation and demodulation performance. Meanwhile, the terminal equipment can configure the proper and first ratio according to the scenes with different time offsets, and further flexibly configure the scenes with different time offsets.
Optionally, in one possible implementation manner, the obtaining unit is further configured to obtain a first correspondence, where the first correspondence is used to indicate a correspondence between a first parameter set and a first cyclic prefix length, and the first parameter set includes a first number and at least two of the following parameters: a first subcarrier spacing, a second subcarrier spacing, a first ratio;
the processing unit is further configured to determine, according to the first correspondence, the first cyclic prefix length corresponding to the first parameter set as a cyclic prefix length of a symbol of the reference signal.
In one implementation manner, the obtaining unit is further configured to obtain first information, where the first information is used to indicate the first correspondence.
Optionally, in one possible implementation manner, the obtaining unit is further configured to obtain a second correspondence, where the second correspondence is used to indicate a correspondence between a second parameter set and the first cyclic prefix length and the second cyclic prefix length, and the second parameter set includes at least two parameters of the first number and the following: a first subcarrier spacing, a second subcarrier spacing, a first ratio;
the processing unit is further configured to determine, according to the second correspondence, a cyclic prefix length corresponding to the second parameter set as a cyclic prefix length of a symbol of the reference signal, and determine, as a cyclic prefix length of a symbol of the data, a second cyclic prefix length corresponding to the second parameter set.
In one implementation manner, the obtaining unit is further configured to obtain second information, where the second information is used to indicate the second correspondence.
In a possible implementation manner, the obtaining unit is further configured to obtain a third correspondence, where the third correspondence is used to indicate a correspondence between a plurality of parameter sets and a plurality of first cyclic prefix lengths, where each parameter set includes one symbol number value and at least two parameters of: the ratio of the two subcarrier spacing values may be expressed as a ratio of a first subcarrier spacing to a second subcarrier spacing or a ratio of a second subcarrier spacing to a first subcarrier spacing.
The processing unit is further configured to determine, according to a third correspondence, a cyclic prefix length corresponding to a first parameter set among the plurality of first cyclic prefix lengths as a cyclic prefix length of a symbol of the reference signal, where the first parameter set includes a number of symbols having a value equal to a number of symbols of the reference signal, and the first parameter set includes at least two parameters including: a value of the first subcarrier spacing, a value of the second subcarrier spacing, a first ratio.
In a possible implementation manner, the obtaining unit is further configured to obtain a fourth correspondence, where the fourth correspondence is used to indicate a correspondence between a plurality of parameter sets and a plurality of first cyclic prefix lengths and a plurality of second cyclic prefix lengths, and each parameter set includes one symbol number value and at least two parameters as follows: the ratio of the two subcarrier spacing values may be expressed as a ratio of a first subcarrier spacing to a second subcarrier spacing or a ratio of a second subcarrier spacing to a first subcarrier spacing.
The processing unit is further configured to determine, according to a fourth correspondence, a cyclic prefix length corresponding to the first parameter set from the plurality of first cyclic prefix lengths as a cyclic prefix length of a symbol of the reference signal, and determine, from the plurality of second cyclic prefix lengths, a cyclic prefix length corresponding to the first parameter set as a cyclic prefix length of a symbol of the data, where the first parameter set includes a number of symbols having a value equal to a value of a number of symbols of the reference signal, and the first parameter set includes at least two parameters: a value of the first subcarrier spacing, a value of the second subcarrier spacing, a first ratio.
Optionally, in a possible implementation, the obtaining unit is further configured to obtain third information, where the third information is used to indicate the first number.
Optionally, in one possible implementation manner, the obtaining unit is further configured to obtain fourth information, where the fourth information is used to indicate a first ratio corresponding to the first number or a first subcarrier spacing corresponding to the first number and a second subcarrier spacing;
the processing unit is further configured to determine a cyclic prefix length of a symbol of the reference signal according to the third information and the fourth information, or determine a cyclic prefix length of a symbol of the reference signal and a cyclic prefix length of a symbol of the data according to the third information and the fourth information.
Specifically, in the embodiment of the present application, the first ratio includes one or more of the following: 5/4, 4/3, 3/2, 5/3, 2, 25/12, 9/4, 5/2, 8/3, 3.
According to the value of the first ratio provided by the embodiment of the application, the cyclic prefix lengths of the symbols of different reference signals can be obtained by configuring the value of different ratios, so that different time bias scenes can be flexibly configured, and the time bias resisting effect is realized. Meanwhile, compared with the ratio of the first subcarrier spacing to the second subcarrier spacing in the prior art, the first ratio of the present application may be fractional, so that the cyclic prefix length of the symbol of the reference signal may be increased to a certain extent.
Alternatively, in one possible implementation, the reference signal may be a ZC sequence, and the length of the reference signal is proportional to a first value, the number of roots of the ZC sequence is proportional to the first value, the number of cyclic shifts of the reference signal is proportional to the first value, wherein the first value includes a ratio of the first subcarrier spacing to the second subcarrier spacing.
In this embodiment of the present application, the length of the reference signal may be configured to be proportional to the ratio of the first subcarrier spacing to the second subcarrier spacing, the reference signal is a ZC sequence, the number of roots of the ZC sequence is proportional to the ratio of the first subcarrier spacing to the second subcarrier spacing, and the number of cyclic shifts of the reference signal is proportional to the ratio of the first subcarrier spacing to the second subcarrier spacing. Therefore, the number of symbols of orthogonal or quasi-orthogonal reference signals can be increased, the probability of collision when a plurality of terminal devices send the reference signals is reduced, and further the channel estimation and demodulation performance is improved.
In a third aspect, an apparatus for determining a cyclic prefix length of a symbol of a reference signal is provided, the apparatus comprising: a memory for storing a program; a processor for executing the program stored in the memory, the processor being configured to perform the method of the first aspect and any implementation manner of the first aspect when the program stored in the memory is executed.
In a fourth aspect, a computer readable medium is provided, the computer readable medium storing program code for execution by a device, the program code comprising instructions for performing the method of any one of the first aspect and the implementation of the first aspect.
In a fifth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any one of the implementations of the first aspect and the first aspect described above.
In a sixth aspect, a chip is provided, where the chip includes a processor and a data interface, where the processor reads an instruction stored on a memory through the data interface, and performs the method in any implementation manner of the first aspect and the first aspect.
Optionally, as an implementation manner, the chip may further include a memory, where the memory stores instructions, and the processor is configured to execute the instructions stored on the memory, where the processor is configured to perform the method in any one of the first aspect and the implementation manner of the first aspect when the instructions are executed.
The chip may be a field-programmable gate array (FPGA) or an application-specific integrated circuit (ASIC).
Drawings
FIG. 1 is a schematic architecture diagram of an example communication system architecture according to an embodiment of the present application;
FIG. 2 is a schematic flow chart of an example of a method for determining a cyclic prefix length of a symbol of a reference signal provided in an embodiment of the present application;
FIG. 3 is a schematic flow chart of another example method of determining a cyclic prefix length of a symbol of a reference signal provided by an embodiment of the present application;
fig. 4 is a schematic structural diagram of an example of a communication resource according to an embodiment of the present application;
FIG. 5 is a schematic diagram of another example communication resource provided by an embodiment of the present application;
FIG. 6 is a schematic flow chart diagram of another example method of determining a cyclic prefix length of a symbol of a reference signal provided by an embodiment of the present application;
FIG. 7 is a schematic flow chart diagram of another example method of determining a cyclic prefix length of a symbol of a reference signal provided by an embodiment of the present application;
FIG. 8 is a schematic flow chart diagram of another example method of determining a cyclic prefix length of a symbol of a reference signal provided by an embodiment of the present application;
fig. 9 is a schematic flow chart of a method for determining a cyclic prefix length of a symbol of a reference signal according to another embodiment of the present application;
FIG. 10 is a schematic structural diagram of an exemplary communication device according to an embodiment of the present disclosure;
Fig. 11 is a schematic structural diagram of another example communication device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of an exemplary communication system architecture according to an embodiment of the present application. The communication system shown is a wireless cellular communication system, which typically consists of cells, each cell containing a Base Station (BS) that can provide communication services to a plurality of terminal devices. Illustratively, the cellular communication system shown in fig. 1 includes a base station, a terminal device #1, a terminal device #2, and the like. Specifically, the base station may send downlink data to the terminal device, where the downlink data may be encoded by using channel coding; the terminal device may also send uplink data to the base station, where the uplink data may also be encoded using channel coding.
The base station comprises a baseband unit (BBU) and a remote radio frequency unit (remote radio unit, RRU). The BBU and RRU may be placed in different places, for example: the RRU can be placed in a high traffic area, the BBU is placed in a central machine room, or the BBU and the RRU are placed in the same machine room, or the BBU and the RRU can be different components under one rack. It should be understood that the wireless cellular communication system shown in fig. 1 may include a plurality of base stations and that the coverage area of each base station may include other numbers of terminal devices, which are not limited in this embodiment of the present application.
It should be understood that the technical solution of the embodiments of the present application may also be applied to communication systems such as wireless cellular communication systems, wireless Mesh (Mesh) networks, satellite communication systems, and the like. When the wireless cellular communication system includes a cellular base station and a plurality of terminal devices, the plurality of terminal devices are capable of assisting the cellular base station in performing artificial intelligence (artificial intelligence, AI) model calculations. When the wireless cellular communication system includes a plurality of cellular base stations and one terminal device, the plurality of cellular base stations can assist the terminal device in performing AI model calculation. The wireless Mesh network comprises a cellular macro base station, a micro base station and terminal equipment. The cellular macro base station transmits downlink data to the terminal equipment through a plurality of micro base station relays. The satellite communication system includes a satellite base station and a terminal device.
The technical scheme provided by the embodiment of the application can be applied to various communication systems, for example: a narrowband internet of things system (NB-IoT), a global system for mobile communications (global system for mobile communications, GSM), an enhanced data rates for GSM evolution system (enhanced data rate for GSM evolution, EDGE), a wideband code division multiple access system (wideband code division multiple access, WCDMA), a code division multiple access 2000 system (code division multiple access, CDMA 2000), a time division-synchronization code division multiple access, TD-SCDMA), a long term evolution (long term evolution, LTE) system, an LTE frequency division duplex (frequency division duplex, FDD) system, an LTE time division duplex (time division duplex, TDD), a fifth generation (5th generation,5G) communication system or a New Radio (NR), a wireless fidelity (wireless fidelity, wiFi) system, and a third generation (6th generation,6G) communication system for a 5G mobile communication system.
The network device in the embodiment of the application has a wireless receiving and transmitting function and is used for communicating with the terminal device. The access network device may be a node in a radio access network (radio access network, RAN), also referred to as a base station, also referred to as a RAN node. An evolved Node B (eNB or eNodeB) in LTE; or base stations in 5G networks such as gndeb (gNB) or base stations in public land mobile networks (public land mobile network, PLMN) that evolve after 5G, broadband network service gateways (broadband network gateway, BNG), aggregation switches or non-third generation partnership project (3rd generation partnership project,3GPP) access devices, etc. Optionally, the network device in the embodiments of the present application may include various forms of base stations, for example: macro base stations, micro base stations (also called small stations), relay stations, access nodes in WiFi systems, transmission and reception points (transmitting and receiving point, TRP), transmission points (transmitting point, TP), mobile switching centers (mobile switching centers), devices-to-devices (D2D), devices that assume base station functions in vehicle-to-machine (M2M) communication, and the like, and may also include Centralized Units (CUs) and Distributed Units (DUs) in cloud access network (cloud radio access network, C-RAN) systems, network devices in NTN communication systems, to which embodiments of the present application are not particularly limited. It should be understood that in the embodiments of the present application, a base station may also be referred to as a base station apparatus.
In the embodiment of the present application, the means for implementing the function of the network device may be the network device; or may be a device, such as a system-on-a-chip, capable of supporting the network device to perform this function. The apparatus may be installed in or used in cooperation with a network device. In the embodiment of the application, the chip system may be formed by a chip, and may also include a chip and other discrete devices.
The terminal in the embodiment of the present application may be a device with a wireless transceiver function, and specifically may refer to a User Equipment (UE), an access terminal, a subscriber unit (subscriber unit), a subscriber station, a mobile station (mobile station), a remote station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device may also be a satellite phone, a cellular phone, a smart phone, a wireless data card, a wireless modem, a machine type communication device, a wireless phone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant (personal digital assistant, PDA), a handheld device with wireless communication functionality, a computing device or other processing device connected to a wireless modem, a vehicle mounted device, a communication device onboard a high altitude aircraft, a wearable device, an unmanned aerial vehicle, a robot, a device-to-device communication (D2D) terminal, a vehicle-outside-the-arm (vehicle to everything, V2X) terminal, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned (self-driving), a wireless terminal in telemedicine (remote media), a wireless terminal in smart grid (smart grid), a wireless terminal in smart grid (smart carrier) or a wireless application (smart carrier) terminal in a smart grid (smart carrier), a smart network, a wireless application (smart carrier) terminal in a smart carrier (smart carrier) or the like. It should be understood that in the embodiments of the present application, a terminal may also be referred to as a terminal device.
In the embodiment of the present application, the device for implementing the function of the terminal device may be the terminal device; or a device, such as a chip system, capable of supporting the terminal device to implement the function. The device can be installed in or matched with the terminal equipment. In the embodiment of the application, the chip system may be formed by a chip, and may also include a chip and other discrete devices.
In order to facilitate understanding, technical terms related to the technical scheme of the present application are explained first.
Sign (symbol)
One symbol generally includes a cyclic prefix CP and time domain data for a period of time. CP in this embodiment of the present application is broadly understood to mean that a CP copies a piece of data at the tail of a symbol to the head of the symbol (which may be referred to as a cyclic prefix in this case), copies a piece of data at the head of a symbol to the tail of the symbol (which may be referred to as a cyclic suffix in this case), or copies a part of data at the head and tail of a symbol to the tail and the head of the symbol, respectively, so as to form a cyclic structure, thereby avoiding interference between signals. For example, a time-domain continuous signal (time-continuous signal) of one symbol may be denoted as s (t), and the duration may be (n+n) cp )·T s T is any time on a symbol, N cp To T as s Length of CP in units, N is T s The length of the time domain data of the above-mentioned time period in units. Let 0.ltoreq.t<(N+N cp )·T s Then the time range in s (t) is 0.ltoreq.t<N cp ·T s Can be regarded as CP, the time range in s (t) is N cp ·T s ≤t<(N cp +N)·T s Can be considered as the above-mentioned time domain data of a period of time having a duration of N.T s 。T s Is a time unit factor, e.g. T s May be a discrete number obtained by performing discrete sampling on the continuous time domain output data s (t)In this regard, the time interval between two adjacent discrete data.
Illustratively, in a long term evolution (long term evolution, LTE) system, for example, n=2048, N cp 160 or 144, T s For 1/(15000×2048) seconds, one symbol consists of a cyclic prefix and time domain data of duration about 66.7 microseconds.
Illustratively, in a New Radio (NR) system, the subcarrier spacing may be configured with a parameter μ as described in the 3gpp ts38.211 protocol, with a corresponding subcarrier spacing of Δf=2 μ 15kHz, wherein μmay be an integer of 0, 1, 2, 3, 4, etc. The corresponding parameter of the time unit (time unit) in NR is T c ，T c ＝1/(Δf max ·N f ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein Δf max ＝480·10 3 Hz，N f ＝4096。T s ＝1/(Δf ref ·N f,ref ) Wherein Δf ref ＝15·10 3 Hz，N f,ref ＝2048。T c And T s Is related to kappa=t s /T c =64. One symbol has a duration ofWherein the duration of the time domain data of the corresponding period of time is +.>The duration of the cyclic prefix is +.>p is the index of the symbol. />The length of the cyclic prefix (i.e. +.>) 144 K.2 -μ +16κ or 144 κ.2 -μ 。
In some embodiments, a symbol may include aTime domain data for a period of time, without including a cyclic prefix or cyclic suffix. For example, if a time-domain continuous signal of one symbol can be represented as s (T), the duration thereof is N.T s Where N is the length of the time domain data for the period of time.
One symbol may be contained within one time unit, which may contain several symbols. The one time unit may be a mini-slot (mini-slot), a slot (slot), a subframe (subframe), a radio frame (radio frame), or the like, which is not limited in the embodiments of the present application. For example, one slot in the LTE system contains 7 or 6 symbols; one slot in a New Radio (NR) system contains 14 or 12 symbols. In the embodiments of the present application, "one symbol" may also be expressed as "one time domain symbol", and then "one symbol time domain continuous signal" may be expressed as "one time domain symbol time domain continuous signal", which are collectively expressed as "one time domain symbol" and "one time domain symbol time domain continuous signal" for convenience of description.
When an inverse fourier transform is used in the process of generating a time-domain continuous signal (time continuous signal) of one time-domain symbol, the time-domain symbol may be referred to as an orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbol, that is, an OFDM symbol. For example, other versions of the NR standard protocol TS 38.211V15.3.0 or TS 38.211 (e.g., TS 38.211V15.2.0 or future protocol versions), one slot containsSuccessive OFDM symbols. Wherein (1)>Is a positive integer, such as 1, 2, 4, 6, 7, 12 or 14, etc.
It should be further noted that, in the embodiment of the present application, a time-domain continuous signal of one time-domain symbol may be understood as a signal sent by a sending end on one time-domain symbol.
Resource Element (RE)
The resource unit is the smallest physical resource, and in general, is also the smallest resource that carries data. One resource unit may correspond to one subcarrier (subcarrier) in the frequency domain and one time domain symbol in the time domain (i.e., within one time domain symbol). In other words, the location of the resource unit may be determined by the index of the time domain symbol and the index of the subcarrier. One RE may typically carry one complex data, e.g., for OFDM waveforms, one RE carries one modulated data; for single-carrier frequency division multiple access (SC-FDMA) waveforms, one RE carries one of the output data obtained by fourier transforming (fourier transformation) the modulated data.
It should also be understood that the technical solution of the embodiments of the present application may be applied to various access technologies when applied in a communication system. For example, it can be applied to orthogonal multiple access (orthogonal multiple access, OMA) technology or non-orthogonal multiple access (non-orthogonal multiple access, NOMA) technology. When applied to the orthogonal multiple access technology, the method can be applied to technologies such as orthogonal frequency division multiple access (orthogonal frequency division multiple access, OFDMA) or single carrier frequency division multiple access (single carrier frequency division multiple access, SC-FDMA), and the like, and embodiments of the present application are not limited. When applied to non-orthogonal multiple access technologies, the method can be applied to technologies such as sparse code multiple access (sparse code multiple access, SCMA), multi-user shared access (multi-user shared access, MUSA), pattern division multiple access (pattern division multiple access, PDMA), interleaving grid multiple access (interleaving-grid multiple access, IGMA), resource extension multiple access (resource spreading multiple access, RSMA), non-orthogonal code multiple access (non-orthogonal coded multiple access, NCMA) or non-orthogonal code multiple access (non-orthogonal coded access, NOCA), and the like, and the embodiments of the present application do not limit the above.
It should also be understood that the technical solution of the embodiment of the present application may be applied to various scheduling types when applied in a communication system. For example, it may be applied to grant-based scheduling or grant-free-based scheduling. When the method is applied to scheduling based on authorization, the network equipment can send scheduling information to the terminal equipment through dynamic signaling, the scheduling information carries transmission parameters, and the network equipment and the terminal equipment perform data transmission based on the transmission parameters. When the method is applied to unlicensed scheduling, scheduling information can be preconfigured, or the network equipment can send the scheduling information to the terminal equipment through semi-static signaling, the scheduling information carries transmission parameters, and the network equipment and the terminal equipment perform data transmission based on the transmission parameters. The unlicensed schedule may also be referred to as a non-dynamic schedule (without dynamic scheduling), a non-dynamic grant (without dynamic grant), or other names, and embodiments of the present application are not specifically limited.
The technical scheme of the embodiment of the application can be applied to wireless communication among communication equipment. Wireless communication can be performed between communication devices by using air interface resources. The communication device may include a network device and a terminal device, and the network device may also be referred to as a network side device. The air interface resources may include at least one of time domain resources, frequency domain resources, code resources, and space resources. In the embodiments of the present application, at least one may also be described as one or more, and a plurality may be two, three, four or more, which is not limited in this application. The wireless communication between the communication devices may include: wireless communication between a network device and a terminal device, wireless communication between a network device and a network device, and wireless communication between a terminal device and a terminal device.
It should be noted that, in the embodiments of the present application, the term "wireless communication" may also be simply referred to as "communication", and the term "communication" may also be described as "data transmission", "signal transmission", "information transmission" or "transmission", etc. In embodiments of the present application, the transmission may include transmission or reception. The transmission may be an uplink transmission, for example, the terminal device sending a signal to the network device; the transmission may also be a downlink transmission, for example, the network device may send a signal to the terminal device.
At present, in a NoMA transmission system, a plurality of terminal devices have the problem of time domain offset in the process of transmitting reference signals and data to base station devices in a period of time unit, so that the symbols of the reference signals received by the base station devices are incomplete and are interfered by the symbols of adjacent reference signals or the symbols of the data, thereby further destroying orthogonality among different terminal devices and obviously influencing channel estimation and demodulation performance. In view of this, the present application proposes a method for determining a cyclic prefix length of a symbol of a reference signal, where a terminal device determines the cyclic prefix length of the symbol of the reference signal by acquiring a subcarrier interval of the symbol for transmitting data, the subcarrier interval for transmitting the reference signal, and the number of symbols of the reference signal, so as to achieve the purpose of resisting time domain offsets of different sizes, and simultaneously flexibly adapt to the time domain offsets in different scenarios, thereby improving channel estimation and demodulation performance. It should be understood that in the embodiments of the present application, the reference signal may be referred to as a pilot signal, which embodiments of the present application do not limit.
Fig. 2 is a schematic flow diagram of a method for determining a cyclic prefix length of a symbol of a reference signal provided in the implementations of the present application. As shown in fig. 2, the method 200 includes steps S201 to S203. Next, step S201 to step S203 will be described in detail by taking uplink transmission as an example.
S201, a first subcarrier spacing and a second subcarrier spacing are acquired.
Specifically, in the embodiment of the present application, the first subcarrier spacing is used for transmitting data on the first time unit, the second subcarrier spacing is used for transmitting the reference signal on the first time unit, and the first subcarrier spacing is greater than the second subcarrier spacing.
In this embodiment, the first subcarrier interval may be referred to as a data subcarrier interval, and the second subcarrier interval may be referred to as a reference signal subcarrier interval, which is not limited in this application.
In the embodiment of the present application, the first subcarrier spacing may be expressed as Δf 1 The second subcarrier spacing may be denoted as Δf 2 。
It should be understood that the time units in the embodiments of the present application may be: one or more symbols, one or more slots, one or more minislots, one or more frames, one or more subframes, one or more fields.
In the present embodiment, the duration of the time unit may be defined as T unit It will be appreciated that T unit The value of (c) may be determined in a predefined manner or signalled to the terminal device by the base station device. For example, time unit T unit The value of (2) may be predefined as T unit ＝ unit /Δf 1 Wherein L is unit May be a predefined value, T unit Can be expressed as L unit The duration of the symbols of the individual data.
It should be further understood that the reference signal provided in the embodiments of the present application may be transmitted in at least one symbol, and may be referred to as a symbol for transmitting the reference signal, where the CP length of the reference signal is the CP length of the symbol for the reference signal. The data may be transmitted in at least one symbol, and the symbol used for transmitting the data may be referred to as a symbol of the data, and the CP length of the data is the CP length of the symbol of the data. The symbols of the reference signal and the symbols of the data may be orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbols or Single carrier frequency division multiple access (SC-FDMA) symbols, which is not limited in this application.
In one possible implementation, the first subcarrier spacing and the second subcarrier spacing in the embodiments of the present application may be acquired in a predefined manner or signaled by the base station device to the terminal device by signaling, which may be downlink control signaling (Downlink Control Information, DCI), or radio resource control (Radio Resource Control, RRC) signaling. In this embodiment of the present application, the value of the first subcarrier spacing may include: 15KHz, 30KHz, 60KHz, 120KHz or 240KHz. For example, when the terminal device is signaled by the base station device that the first subcarrier spacing is 30KHz, the second subcarrier spacing may likewise be determined by the base station device in a predefined manner or by signaling, and the first subcarrier spacing is greater than the second subcarrier spacing.
For example, the base station apparatus transmits first information indicating the first subcarrier spacing and the second subcarrier spacing to the terminal apparatus. Specifically, the value of the first information corresponds to the first subcarrier spacing and the second subcarrier spacing. Wherein the value of the first information may be expressed as I 1 The first information has a value corresponding to the number of bits of
In one possible implementation, the correspondence between the value of the first information and the first subcarrier spacing and the second subcarrier spacing may be as shown in table 1 below.
TABLE 1
Illustratively, as shown in Table 1 above, when the value of the first information is 0, the first subcarrier spacing is 15KHz and the second subcarrier is 12KHz; when the value of the first information is 10, the first subcarrier interval is 15KHz, and the second subcarrier interval is 10KHz; when the value of the first information is 35, the first subcarrier spacing is 15KHz, and the second subcarrier spacing is 6KHz. It should be understood that the correspondence between the values of the first information and the first subcarrier spacing and the second subcarrier spacing in table 1 is merely an example, and the embodiment of the present application is not limited thereto.
S202, a first number is acquired, wherein the first number represents the number of symbols of a reference signal to be transmitted on a first time unit.
Specifically, the terminal device may determine the first number by receiving information transmitted by the base station device. For example, the base station device may inform the terminal device in the form of signaling that the number of symbols of the reference signal on the first time unit is 1.
S203, determining the cyclic prefix length of the symbol of the reference signal according to the first subcarrier interval, the second subcarrier interval and the first number.
In one possible implementation, the terminal device may determine the cyclic prefix length of the symbols of the reference signal according to the first subcarrier spacing, the second subcarrier spacing, and the number of symbols of the reference signal.
It should be understood that the CP length of the symbol of the data in the embodiment of the present application may be understood as the CP length of the symbol of the data in the long term evolution system LTE or the wireless NR system. The CP length of the symbol of the reference signal in the embodiment of the present application may be the CP length of the symbol of the discrete reference signal, and the CP length of the symbol of the data may also be the CP length of the symbol of the discrete data.
In the embodiment of the application, the point number of the inverse discrete fourier transform corresponding to the sign of the data isThe duration of the sign of the data can be expressed as +.>Or->Wherein T is s Is a time unit factor.
It will be appreciated that the duration of the symbols of the data corresponding to the different subcarrier spacings are different, e.g. the duration of the symbols corresponding to the first subcarrier spacing (irrespective of the cyclic prefix) is 1/af 1 Second.
In one possible implementation of the present invention,can be a predefined value, T s 、T c Lambda may be determined by the subcarrier spacing of the symbol. T corresponding to the symbol of the first subcarrier spacing, for example s Can be expressed as +.>In another possible implementation, T s 、T c Lambda are all predefined values, +.>Is determined by the subcarrier spacing of the symbols, wherein the symbol of the first subcarrier spacing corresponds to +.>Can be expressed as 1/(T) s ×Δf 1 ) I.e. +.>Associated with the first subcarrier spacing.
Exemplary, when L unit Time unit T when=7.5 unit Is of duration T unit ＝7.5/Δf 1 . I.e. the duration of the time unit may be expressed as the duration of 7.5 symbols of data (i.e. the symbols of the first subcarrier spacing) corresponding to the number of points of the inverse discrete fourier transformThe duration of the symbols of the data is 1/Δf 1 Second, wherein, different Δf 1 Corresponding T s Different. In this case, the correspondence between the first subcarrier spacing, the second subcarrier spacing, the number of reference signal symbols, and the cyclic prefix length of the symbols of the reference signal is shown in table 2 below.
TABLE 2
/>
Illustratively, when the first subcarrier spacing is 15KHz, the second subcarrier spacing is 9KHz, and the number of symbols of the reference signal is 1, the cyclic prefix length of the symbols of the reference signal is 728; when the first subcarrier spacing is 60KHz, the second subcarrier spacing is 45KHz, and the number of symbols of the reference signal is 2, the cyclic prefix length of the symbols of the reference signal is 418; when the first subcarrier spacing is 60KHz, the second subcarrier spacing is 40KHz, and the number of symbols of the reference signal is 3, the cyclic prefix length of the symbols of the reference signal is 436; when the first subcarrier spacing is 120KHz, the second subcarrier spacing is 90KHz, and the number of symbols of the reference signal is 4, the cyclic prefix length of the symbols of the reference signal is 418.
In one possible implementation manner, the first subcarrier spacing and the second subcarrier spacing in table 2 may be indicated by the first information, and the number of symbols of the reference signal may be signaled to the terminal device by the base station device.
In another possible implementation manner, the correspondence between the first carrier interval, the second subcarrier interval, the number of symbols of the reference signal and the cyclic prefix length of the symbols of the reference signal in table 2 may be signaled to the terminal device by the base station device. For example, the base station apparatus may indicate a correspondence relationship between the first carrier interval, the second subcarrier interval, the number of symbols of the reference signal, and the cyclic prefix length of the symbols of the reference signal through the above-described first information.
It should be appreciated that, when the number of points of the inverse discrete fourier transform corresponding to the symbol of the data is related to the data subcarrier spacing, the CP length of the symbol of the reference signal in table 2 may also be related to the data subcarrier spacing. For example, the number of points of the inverse discrete Fourier transform corresponding to the sign of the data isWherein the value of alpha is defined by the first subcarrier spacing deltaf 1 It is determined that the CP length of the symbol of the corresponding reference signal may be a value of the CP length of the symbol of the reference signal in table 2 multiplied by α.
In one possible implementation, the determining, by the terminal device, the cyclic prefix length of the symbols of the reference signal according to the first subcarrier spacing, the second subcarrier spacing, and the number of symbols of the reference signal to be transmitted over the first time unit further includes: the terminal equipment determines the cyclic prefix length of the symbols of the reference signal according to the ratio of the first subcarrier interval to the second subcarrier interval and the number of the symbols of the reference signal. The method for determining the cyclic prefix length of the symbol of the reference signal includes steps S301 to S303 as shown in fig. 3.
S301, a first subcarrier interval and a ratio of the first subcarrier interval to a second subcarrier interval are obtained.
It should be appreciated that the terminal device may determine the second subcarrier spacing based on the first subcarrier spacing and a ratio of the first subcarrier spacing to the second subcarrier spacing.
In the embodiment of the present application, the ratio of the first subcarrier spacing to the second subcarrier spacing may be represented as k, where k is a real number greater than 1. The cyclic prefix length of the symbols of the reference signal is related to the k value.
It should be appreciated that in embodiments of the present application, the first subcarrier spacing may be expressed as Δf 1 The second subcarrier spacing may be denoted as Δf 2 The ratio k of the first subcarrier spacing to the second subcarrier spacing may be expressed as:
k＝Δf 1 /Δf 2 (1)
the terminal device obtains a k value and a first subcarrier spacing, and determines a second subcarrier spacing based on the k value and the first subcarrier spacing.
Wherein the value of k can be determined in a predefined manner or the base station device informs the terminal device in a signaling indication manner. The first subcarrier spacing may also be determined in a predefined manner or the base station device may inform the terminal device in a signaling manner. For example, the value of k may be predefined as 2, the first subcarrier spacing may be predefined as 30KHz, and the second subcarrier spacing may be known as 15KHz.
Wherein, the value of k can be one or more of the following: 5/4, 4/3, 3/2, 5/3, 2, 25/12, 9/4, 5/2, 8/3, 3.
It should be understood that, in the embodiment of the present application, the value of the first subcarrier spacing may include: 15KHz, 30KHz, 60KHz, 120KHz or 240KHz. The first subcarrier interval is a data subcarrier interval, and the first subcarrier interval may refer to a determination mode of the data subcarrier interval in the LTE system or the NR system, which is not limited in this application.
In one possible implementation, the value of k may satisfy the following relationship:
k＝A/B (2)
wherein,and alpha is 2 、α 3 、α 5 、β 2 、β 3 、β 5 Are integers not less than zero. For example, the value of k may include: 5/4,4/3,3/2,5/3,2, 25/12,9/4,5/2,8/3,3. When k=5/4, α in formula (2) 2 ＝0，α 3 ＝0，α 5 ＝1，β 2 ＝2，β 3 ＝0，β 5 =0; when k=5/3, α in formula (2) 2 ＝0，α 3 ＝0，α 5 ＝1，β 2 ＝0，β 3 ＝1，β 5 ＝0。
In one possible implementation, the symbols of the reference signal and the symbols of the data to be transmitted over the first time unit may be discrete symbols. For example, when the reference signal and the symbol of the data are OFDM symbols, the data transmitted in the frequency domain may be subjected to inverse discrete fourier transform to generate a symbol of discrete data, and the number of points of the inverse discrete fourier transform corresponding to the symbol of the data may be expressed asI.e. the sign of the discrete data comprises +.>Discrete values. The number of points of the inverse discrete fourier transform corresponding to the sign of the reference signal at the first time unit may be expressed as +.>And the following are provided
The number of subcarriers corresponding to one Resource Block (RB) of the symbols of the data can be expressed asFor example, the->The number of subcarriers corresponding to one resource block RB of a symbol of the reference signal may be expressed asAnd satisfy->
In this way, in the embodiment of the present application, by adopting the value of k related to the present application, the number of points of inverse discrete fourier transform of the symbol of the reference signal related to the value of k and the number of subcarriers corresponding to one resource block of the symbol of the reference signal are both positive integers, so that the complexity of generating the symbol of the reference signal and the complexity of implementing hardware can be significantly reduced.
S302, the number of symbols of the reference signal on the first time unit is acquired.
S303, determining the cyclic prefix length of the symbols of the reference signal according to the ratio of the first subcarrier interval to the second subcarrier interval and the number of the symbols of the reference signal.
A method of further determining the cyclic prefix length of the symbol of the reference signal at the first time unit based on the above determination of the first subcarrier spacing, the second subcarrier spacing and the k value is described in detail below.
Mode one
The terminal device receives second information sent by the base station device, where the second information may be used to indicate a first correspondence, where the first correspondence is used to indicate a correspondence between a ratio of the first subcarrier spacing to the second subcarrier spacing, a number of symbols of the reference signal, and a cyclic prefix length of the symbols of the reference signal.
In the embodiment of the present application, the number of discrete fourier transform-facilitating points corresponding to the symbols of the data at the first time unit may be expressed asThe duration of the sign of the data can be expressed as +.>Or->Wherein T is s ＝λ·T c ，T s Is a time unit factor.
In one possible implementation, at L unit Time unit T when=7.5 unit The duration of (2) can be expressed as: t (T) unit ＝7.5/Δf 1 I.e. the duration of the time unit is understood to be the duration of the symbols of 7.5 data. Point number of inverse discrete fourier transform corresponding to sign of dataThe duration of the symbols of the data is 1/Δf 1 Second, wherein, different Δf 1 Corresponding T s In this case, the second information indicates the correspondence relationship of the value of k, the number of symbols of the reference signal, and the CP length of the symbols of the reference signal in the first time unit as shown in table 3 below.
TABLE 3 Table 3
Illustratively, when the value of the second information is 0, the value of k is 5/3, the number of symbols of the reference signal is 1, and the cyclic prefix length of the symbols of the reference signal is 728; when the value of the second information is 3, the value of k is 4/3, the number of symbols of the reference signal is 2, and the cyclic prefix length of the symbols of the reference signal is 418; when the value of the second information is 6, the value of k is 2, the number of symbols of the reference signal is 3, and the cyclic prefix length of the symbols of the reference signal is 216; when the value of the second information is 7, the value of k is 4/3, the number of symbols of the reference signal is 4, and the cyclic prefix length of the symbols of the reference signal is 418.
In the embodiment of the present application, the CP length of the symbol of the reference signal may be expressed as N cp,rs The duration of the cyclic prefix length of the corresponding symbol of the reference signal may be N cp,rs ·λ·T c Or N cp,rs ·T s And the number of symbols of the reference signal may be expressed as N rs . Taking Table 3 as an example, the number of points of the inverse discrete Fourier transform corresponding to the sign of the data for different first subcarrier spacing1536, thus T s Associated with the first sub-carrier, i.e. +.>
The cyclic prefix length of the symbols of the data over the first time unit may be represented as N cp,data The duration of the cyclic prefix length of the symbol of the corresponding data may be expressed as: n (N) cp,data ·T s Or N cp,data ·λ·T c . Meanwhile, the number of symbols of the data may be represented as N data . The number of points of the inverse discrete fourier transform corresponding to the sign of the data at the first time unitIn the LTE system or NR system, the cyclic prefix length of the symbol of the data is N cp,data ＝108。
It should be appreciated that in embodiments of the present application, the number of points of the inverse discrete fourier transform corresponding to the sign of the data at the first time unitThis is merely an example and is not limiting in this application.
In another possible implementation, when the number of points of the inverse discrete fourier transform corresponding to the symbol of the data is related to the data subcarrier spacing, the CP length of the symbol of the reference signal may also be related to the data subcarrier spacing. For example, T can be predefined s 、T c The value of lambda, at which time the duration of the symbols of the first subcarrier spacing for a different first subcarrier spacing may be expressed asI.e. < ->Associated with the first subcarrier spacing. At this time, the number of points of the inverse discrete Fourier transform corresponding to the sign of the data may be expressed as +.>Wherein the value of alpha is defined by the first subcarrier spacing deltaf 1 Determined, e.g. α=1/(Δf) 1 ·T s 1536). It can be appreciated that the CP length of the symbol of the corresponding reference signal may be the value of the CP length of the symbol of the reference signal in table 3 multiplied by α. />
It should be understood that the correspondence between the value of the second information and the value of k, the number of symbols of the reference signal, and the cyclic prefix length of the symbols of the reference signal in table 3 is merely an example, which is not limited by the embodiment of the present application.
It should be understood that the correspondence between the value of k in the first time unit, the number of symbols of the reference signal, and the CP length of the symbols of the reference signal may be the correspondence between some or all of the rows in table 3, which is not limited in the embodiment of the present application.
In one possible implementation, the correspondence between the value of k in table 3 above, the number of symbols of the reference signal, and the cyclic prefix length of the symbols of the reference signal is as follows Shown in fig. 4. As shown in fig. 4, assume the number of points of the inverse discrete fourier transform corresponding to the sign of the data at the first time unitFirst subcarrier spacing deltaf 1 The time of this first time unit is denoted as the duration of the symbol of 7.5 data =15 KHz.
When the value of the second information is 0, as shown in (a) of fig. 4, the value of the second information indicates that the value of k is 5/3, the number of symbols of the reference signal is 1, and the cyclic prefix length of the symbols of the reference signal is 728. When the value of the second information is 3, as shown in (b) of fig. 4, the value of the second information indicates that the value of k is 4/3, the number of symbols of the reference signal is 2, and the cyclic prefix length of the symbols of the reference signal is 418. When the value of the second information is 4, as shown in (c) of fig. 4, the value of the second information indicates that the value of k is 2, the number of symbols of the reference signal is 2, and the cyclic prefix length of the symbols of the reference signal is 216. When the value of the second information is 5, as shown in (d) of fig. 4, the value of the second information indicates that the value of k is 3/2, the number of symbols of the reference signal is 3, and the cyclic prefix length of the symbols of the reference signal is 436.
In one possible implementation, the number of symbols of the data on the first time unit may be related to the above-mentioned value of k, in particular, the number of symbols of the data on the first time unit may be determined based on the number of symbols of the reference signal, the cyclic prefix length of the symbols of the reference signal, and the value of k. For example, the number of symbols of the data over the first time unit may be represented as follows:
Wherein the symbols areThe representation is rounded down.
It should be understood that the starting position of the symbol of the reference signal on the first time unit shown in fig. 4, and the positions of the symbol of the reference signal and the symbol of the data at the time unit may be determined in a predefined manner, or determined by the base station apparatus by means of signaling, which is not limited in this application.
In one possible implementation, for the start symbol on the first time unit, the cyclic prefix length of the start symbol may be additionally increasedWherein, the->May be a predefined value. For example, when->When (I)>In case the starting symbol is the symbol of the reference signal, the cyclic prefix length of the symbol of the reference signal is +.>And the start symbol is additionally increased by the cyclic prefix length +.>Associated with the value of k.
In another implementation manner of the first aspect, the method for determining a cyclic prefix of a symbol of a reference signal further includes the following three steps:
1. the terminal device receives third information transmitted by the base station device, which may be used to indicate the number of symbols of the reference signal on the first time unit.
In one possible implementation, the number N of symbols of the reference signal on the first time unit determined based on the third information rs Can be seen as shown in table 4 below. Wherein the number of bits corresponding to the value of the third information2.
TABLE 4 Table 4
Value of third information Number of symbols of reference signal
0 1
1 2
2 3
3 4
Specifically, when the value of the third information is 0, the third information indicates that the number of symbols of the reference signal on the first time unit is 1; when the value of the third information is 1, the third information indicates that the number of symbols of the reference signal at the first time unit is 2; when the value of the third information is 2, the third information indicates that the number of symbols of the reference signal at the first time unit is 3; when the value of the third information is 3, the third information indicates that the number of symbols of the reference signal at the first time unit is 4.
It should be understood that the correspondence between the value of the third information and the number of symbols of the reference signal in table 4 is merely an example, and the embodiment of the present application is not limited thereto.
2. The terminal equipment receives fourth information sent by the base station equipment, wherein the fourth information is used for indicating the ratio of the first subcarrier interval to the second subcarrier interval on the first time unit, and the ratio of the first subcarrier interval to the second subcarrier interval corresponds to the number of symbols of the reference signal on the first time unit indicated by the third information.
3. And the terminal equipment determines the cyclic prefix length of the symbol of the reference signal on the first time unit according to the third information and the fourth information.
In one possible implementation, determining the cyclic prefix length of the symbols of the reference signal based on the number of symbols of the reference signal at the first time unit indicated by the third information and the ratio of the first subcarrier spacing to the second subcarrier spacing indicated by the fifth information may be as shown in table 5 below. As shown in Table 5, assume L unit =7.5, the first time unit T unit ＝7.5/Δf 1 I.e. the duration of the first time unit can be expressed as the duration of 7.5 symbols of data, and the number of points of the inverse discrete fourier transform corresponding to the symbols of the data
TABLE 5
As can be seen from table 5, the number of bits corresponding to the value of the fourth information is 2.
For example, when the number of symbols of the reference signal determined by the third information is 1 and the value of the fourth information is 0, it may be determined that the cyclic prefix length of the symbols of the reference signal at the first time unit is 728; when the number of symbols of the reference signal determined by the third information is 2 and the value of the fourth information is 1, determining that the cyclic prefix length of the symbols of the reference signal in the first time unit is 216; when the number of symbols of the reference signal determined by the third information is 3 and the value of the fourth information is 0, determining that the cyclic prefix length of the symbols of the reference signal in the first time unit is 436; when the number of symbols of the reference signal determined by the third information is 4 and the value of the fourth information is 0, the cyclic prefix length of the symbols of the reference signal at the first time unit may be determined to be 418.
It should be understood that the correspondence between the value of the fourth information and the value of k, the number of symbols of the reference signal, and the cyclic prefix length of the symbols of the reference signal in table 5 is merely an example, and the embodiment of the present application is not limited thereto.
According to the method for determining the cyclic prefix length of the reference signal symbol provided by the embodiment of the application, the cyclic prefix length of the reference signal symbol on the first time unit is related to the value of k, and different values of k can correspond to the cyclic prefix lengths of different reference signal symbols. Therefore, the cyclic prefix length of the reference signal symbol can be increased to a certain extent, so that the reference signal can resist larger time bias, orthogonality among the reference signals sent by different terminal devices is ensured, and channel estimation and demodulation performances are improved. Meanwhile, the proper k value can be configured according to different time bias scenes, so that different time bias scenes can be flexibly adapted.
Mode two
In one implementation manner of the second aspect, the terminal device receives fifth information sent by the base station device, where the fifth information may be used to indicate a second correspondence, where the second correspondence indicates a correspondence between a ratio of the first subcarrier spacing to the second subcarrier spacing, a number of symbols of the reference signal, a cyclic prefix length of the symbols of the reference signal, and a cyclic prefix length of the symbols of the data.
It should be understood that in the embodiment of the present application, the cyclic prefix length of the symbol of the reference signal and the cyclic prefix length of the symbol of the data in the first time unit may be the same or different, which is not limited in the embodiment of the present application.
The following describes in detail an example in which the cyclic prefix length of the symbol of the reference signal and the cyclic prefix length of the symbol of the data are identical at the first time unit.
In one possible implementation, when L unit When=7.5, the time unit T unit Is of duration T unit ＝7.5/Δf 1 I.e. the timeThe duration of a cell may be expressed as the duration of a symbol of 7.5 data. And the number of points of the inverse discrete fourier transform corresponding to the sign of the data at the time unitThe correspondence between the ratio of the first subcarrier spacing to the second subcarrier spacing, the number of symbols of the reference signal, the cyclic prefix length of the symbols of the reference signal and the cyclic prefix length of the symbols of the data, which are determined by the fifth information received by the terminal device, is shown in table 6 below.
TABLE 6
It should be appreciated that the number of points of the inverse discrete fourier transform corresponding to the sign of the data in table 6Merely by way of example. In one possible implementation, when the number of points of the inverse discrete fourier transform corresponding to the sign of the data is related to the data subcarrier spacing, the number of points of the inverse discrete fourier transform corresponding to the sign of the data may be +. >Wherein the value of alpha is defined by the first subcarrier spacing deltaf 1 And (3) determining.
It should also be understood that the correspondence between the value of the fifth information and the value of k, the number of symbols of the reference signal, the cyclic prefix length of the symbols of the reference signal, and the cyclic prefix length of the symbols of the data in table 6 is merely an example, and the embodiment of the present application is not limited thereto.
The correspondence relationship between the ratio of the first subcarrier spacing to the second subcarrier spacing, the number of symbols of the reference signal, the cyclic prefix length of the symbols of the reference signal, and the cyclic prefix length of the symbols of the data shown in table 6 may be as shown in fig. 5. On the time cell shown in fig. 5, assume thatFirst subcarrier spacing deltaf 1 The duration of this time unit can be expressed as the duration of the 7.5 data symbols, i.e. +.>
Specifically, as shown in (a) of fig. 5, when the value of the fifth information is 0, the value of k is 3/2, the number of symbols of the reference signal is 1, and the cyclic prefix length of the symbols of the reference signal and the data is 336. As shown in (b) of fig. 5, when the value of the fifth information is 1, the value of k is 5/2, the number of symbols of the reference signal is 1, and the cyclic prefix length of the symbols of the reference signal and the data is 408. As shown in fig. 5 (c), when the value of the fifth information is 2, the value of k is 5/4, the number of symbols of the reference signal is 2, and the cyclic prefix length of the symbols of the reference signal and the data is 336. As shown in (d) of fig. 5, when the value of the fifth information is 3, the value of k is 5/4, the number of symbols of the reference signal is 3, and the cyclic prefix length of the symbols of the reference signal and the data is 256.
In one possible implementation, when L unit Time unit T when=15 unit ＝15/Δf 1 I.e. expressed as unit time T unit Is the duration of 15 data symbols. And assuming the number of points of the inverse discrete fourier transform corresponding to the sign of the data over the time cellIn this case, the correspondence relationship between the ratio of the first subcarrier spacing to the second subcarrier spacing, the number of symbols of the reference signal, the cyclic prefix length of the symbols of the reference signal, and the cyclic prefix length of the symbols of the data, which are determined by the fifth information received by the terminal device, is shown in table 7 below.
TABLE 7
It should be understood that the correspondence between the value of the fifth information and the value of k, the number of symbols of the reference signal, the cyclic prefix length of the symbols of the reference signal, and the cyclic prefix length of the symbols of the data in table 7 is only an example, and the embodiment of the present application is not limited thereto.
Optionally, the number N of symbols of the data on the time unit data May be related to the value of k. Specifically, the number of symbols N of the data data The determination may be based on the number of symbols of the reference signal, the cyclic prefix length of the symbols of the data, and the value of k.
In one possible implementation, the number of symbols of the data over the time unit may be expressed as:
optionally, for the start symbol in the time unit, the cyclic prefix length of the start symbol may be additionally increasedWherein the value of the additional increase of the start symbol may be a predefined value. For example, when the start symbol is a symbol of the reference signal, the cyclic prefix length of the symbol of the reference signal corresponding to the start symbol can be expressed as +.>And the additional cyclic prefix length of the start symbol is related to the value of k, specifically, the additional cyclic prefix length of the start symbol corresponds to the value of the fifth information. />
In one placeIn a possible implementation, as shown in table 6 above,in the case of (2), when the value of the fifth information is 0, the cyclic prefix length of the start symbol may be additionally increased by +.>When the value of the fifth information is 3, the +.>The value of (2) may be 0. As shown in Table 7 above, ->In the case of (2), when the value of the fifth information is 0, is->May have a value of 56; when the value of the fifth information is 1, the +.>May have a value of 0; when the value of the fifth information is 2, < >>May have a value of 56; when the value of the fifth information is 3, the +.>May have a value of 80; when the value of the fifth information is 4, the +. >May have a value of 12; when the value of the fifth information is 5, the +.>The value of (2) may be 48.
In another implementation manner of the second aspect, the terminal device receives sixth information sent by the base station device, where the sixth information may be used to indicate the number of symbols of the reference signal on the first time unit. The terminal device receives seventh information sent by the base station device, where the seventh information is used to indicate a ratio of the first subcarrier spacing to the second subcarrier spacing on the first time unit, and the ratio of the first subcarrier spacing to the second subcarrier spacing corresponds to the number of symbols of the reference signal on the first time unit indicated by the sixth information. And the terminal equipment determines the cyclic prefix length of the symbol of the reference signal and the cyclic prefix length of the symbol of the data in the first time unit according to the sixth information and the seventh information.
In one possible implementation, the number of symbols of the reference signal at the first time unit determined based on the sixth information may be as shown in table 8 below. Wherein the number of bits corresponding to the value of the sixth information is 2.
TABLE 8
Value of sixth information Number of symbols of reference signal
0 1
1 2
2 3
It should be understood that the process of indicating the number of symbols of the reference signal in the first time unit by the sixth information is the same as or similar to the process of indicating the number of symbols of the reference signal in the first time unit by the fourth information in the second mode, and is not repeated herein for brevity.
It should also be understood that the correspondence between the value of the sixth information in table 8 and the number of symbols of the reference signal is merely an example, and the embodiment of the present application is not limited thereto.
In one possible implementation, determining the cyclic prefix length of the symbols of the reference signal and the symbols of the data based on the number of symbols of the reference signal at the first time unit indicated by the sixth information and the ratio of the first subcarrier spacing to the second subcarrier spacing indicated by the seventh information may be as shown in table 9 below. As shown in Table 9, assume L unit =7.5, the first time unit T unit ＝7.5/Δf 1 I.e. the duration of the first time unit can be expressed as the duration of 7.5 symbols of data, and the number of points of the inverse discrete fourier transform corresponding to the symbols of the data
TABLE 9
/>
As can be seen from table 9, the number of bits corresponding to the value of the seventh information may be 1.
For example, when the number of symbols of the reference signal determined by the seventh information is 1 and the value of the sixth information is 0, it may be determined that the cyclic prefix length of the symbols of the reference signal at the first time unit is 336; when the number of symbols of the reference signal determined by the seventh information is 2 and the value of the sixth information is 0, determining that the cyclic prefix length of the symbols of the reference signal at the first time unit is 336; when the number of symbols of the reference signal determined by the seventh information is 3 and the value of the sixth information is 0, it may be determined that the cyclic prefix length of the symbols of the reference signal at the first time unit is 256.
It should be understood that the correspondence between the value of the seventh information and the value of k, the number of symbols of the reference signal, the cyclic prefix length of the symbols of the reference signal, and the cyclic prefix length of the symbols of the data in table 9 is only an example, and the embodiment of the present application is not limited thereto.
In another possible implementation, the terminal device determines the cyclic prefix length of the symbols of the reference signal according to the ratio of the first subcarrier spacing to the second subcarrier spacing, the number of symbols of the reference signal, and the number of symbols of the data.
In a similar manner to the above manner, the terminal device receives eighth information sent by the base station device, where the eighth information may be used to indicate a third correspondence, where the third correspondence is used to indicate a correspondence between a ratio of the first subcarrier interval to the second subcarrier interval, a number of symbols of the reference signal, a number of symbols of the data, and a cyclic prefix length of the symbols of the reference signal.
In one possible implementation, at L unit Time unit T when=7.5 unit The duration of (2) can be expressed as: t (T) unit ＝7.5/Δf 1 I.e. the duration of the time unit is understood to be the duration of the symbols of 7.5 data. Point number of inverse discrete fourier transform corresponding to sign of data The duration of the symbols of the data is 1/Δf 1 Seconds (different Δf) 1 Corresponding T s Different), in this case, the above eighth information indicates a correspondence relationship of the value of k, the number of symbols of the reference signal, the number of symbols of the data, and the CP length of the symbols of the reference signal within the first time unit as shown in table 10 below.
Table 10
Illustratively, when the value of the eighth information is 0, the value of k is 5/3, the number of symbols of the reference signal is 1, the number of symbols of the data is 5, and the cyclic prefix length of the symbols of the reference signal is 728; when the value of the eighth information is 3, the value of k is 4/3, the number of symbols of the reference signal is 2, the number of symbols of the data is 4, and the cyclic prefix length of the symbols of the reference signal is 418; when the value of the eighth information is 6, the value of k is 2, the number of symbols of the reference signal is 3, the number of symbols of the data is 1, and the cyclic prefix length of the symbols of the reference signal is 216; when the value of the eighth information is 7, the value of k is 4/3, the number of symbols of the reference signal is 4, the number of symbols of the data is 1, and the cyclic prefix length of the symbols of the reference signal is 418.
In another possible implementation, at L unit Time unit T when=15 unit The duration of (2) can be expressed as: t (T) unit ＝15/Δf 1 I.e. the duration of the time unit is understood to be the duration of the symbols of 15 data. Point number of inverse discrete fourier transform corresponding to sign of dataThe duration of the symbols of the data is 1/Δf 1 Seconds (different Δf) 1 Corresponding T s Different), in this case, the above eighth information indicates a correspondence relationship of the value of k, the number of symbols of the reference signal, the number of symbols of the data, and the CP length of the symbols of the reference signal within the first time unit as shown in table 11 below.
TABLE 11
Illustratively, when the value of the eighth information is 0, the value of k is 5/3, the number of symbols of the reference signal is 1, the number of symbols of the data is 12, and the cyclic prefix length of the symbols of the reference signal is 728; when the value of the eighth information is 3, the value of k is 4/3, the number of symbols of the reference signal is 2, the number of symbols of the data is 11, and the cyclic prefix length of the symbols of the reference signal is 418; when the value of the eighth information is 6, the value of k is 2, the number of symbols of the reference signal is 3, the number of symbols of the data is 8, and the cyclic prefix length of the symbols of the reference signal is 216; when the value of the eighth information is 7, the value of k is 4/3, the number of symbols of the reference signal is 4, the number of symbols of the data is 8, and the cyclic prefix length of the symbols of the reference signal is 418.
In a similar manner to the second aspect, the terminal device may receive ninth information sent by the base station device, where the ninth information may be used to indicate a fourth correspondence relationship, where the fourth correspondence relationship indicates a correspondence relationship between a ratio of the first subcarrier spacing to the second subcarrier spacing, a number of symbols of the reference signal, a number of symbols of the data, a cyclic prefix length of the symbols of the reference signal, and a cyclic prefix length of the symbols of the data.
In one possible implementation, when L unit When=7.5, the time unit T unit Is of duration T unit ＝7.5/Δf 1 I.e. the duration of the time unit may be expressed as the duration of the symbols of 7.5 data. And the number of points of the inverse discrete fourier transform corresponding to the sign of the data at the time unitThe correspondence between the ratio of the first subcarrier spacing to the second subcarrier spacing, the number of symbols of the reference signal, the number of symbols of the data, the cyclic prefix length of the symbols of the reference signal and the cyclic prefix length of the symbols of the data, which are determined by the ninth information received by the terminal device, is shown in table 12 below.
Table 12
Illustratively, when the value of the ninth information is 0, the value of k is 3/2, the number of symbols of the reference signal is 1, the number of symbols of the data is 5, and the cyclic prefix length of the symbols of the reference signal and the cyclic prefix length of the symbols of the data are 336; when the value of the ninth information is 1, the value of k is 5/2, the number of symbols of the reference signal is 1, the number of symbols of the data is 4, and the cyclic prefix length of the symbols of the reference signal and the cyclic prefix length of the symbols of the data are 408; when the value of the ninth information is 2, the value of k is 5/4, the number of symbols of the reference signal is 2, the number of symbols of the data is 4, and the cyclic prefix length of the symbols of the reference signal is 336; when the value of the ninth information is 3, the value of k is 5/4, the number of symbols of the reference signal is 3, the number of symbols of the data is 3, and the cyclic prefix length of the symbols of the reference signal and the cyclic prefix length of the symbols of the data are 256.
In one possible implementation, the determining, by the terminal device, the cyclic prefix length of the symbols of the reference signal according to the first subcarrier spacing, the second subcarrier spacing, and the number of symbols of the reference signal on the first time unit further comprises: the terminal device determines the cyclic prefix length of the symbols of the reference signal according to the ratio between the second subcarrier spacing and the first subcarrier spacing and the number of symbols of the reference signal. The method for determining the cyclic prefix length of the symbol of the reference signal is shown in fig. 6, and fig. 6 is a schematic flow chart diagram of another example of a method for determining the cyclic prefix length of the symbol of the reference signal provided in the implementation of the present application. As shown in fig. 6, the method 600 includes steps S601 to S603. Next, step S601 to step S603 will be described in detail by taking uplink transmission as an example.
S601, a first subcarrier spacing and a ratio of a second subcarrier spacing to the first subcarrier spacing are obtained.
Wherein, the ratio p of the second subcarrier spacing to the first subcarrier spacing can be expressed as:
p＝Δf 2 /Δf 1 (5)
it will be appreciated that the relationship between the ratio k of the first subcarrier spacing to the second subcarrier spacing and the ratio p of the second subcarrier spacing to the first subcarrier spacing is k=1/p.
Specifically, the terminal device acquires a p value and a first subcarrier spacing, and determines a second subcarrier spacing based on the p value and the first subcarrier spacing.
It should be understood that step S601 is the same as or similar to step S301, and will not be described here again for brevity.
S602, the number of symbols of the reference signal at the first time unit is acquired.
It should be understood that step S602 is the same as or similar to step S302, and is not repeated here for brevity.
S603, determining the cyclic prefix length of the symbols of the reference signal according to the ratio of the second subcarrier spacing to the first subcarrier spacing and the number of symbols of the reference signal.
It should be appreciated that the method of further determining the cyclic prefix length of the symbol of the reference signal at the first time unit is described in detail below on the basis of the above determination of the first subcarrier spacing, the second subcarrier spacing and the p-value.
Mode one
The terminal device receives tenth information sent by the base station device, where the tenth information may be used to indicate a fifth correspondence, where the fifth correspondence is used to indicate a correspondence between a ratio between the second subcarrier spacing and the first subcarrier spacing, a number of symbols of the reference signal, and a cyclic prefix length of the symbols of the reference signal.
In one possible implementation, at L unit Time unit T when=7.5 unit The duration of (2) can be expressed as: t (T) unit ＝7.5/Δf 1 I.e. the duration of the time unit is understood to be the duration of the symbols of 7.5 data. Point number of inverse discrete fourier transform corresponding to sign of dataThe duration of the symbols of the data is 1/Δf 1 Seconds (different Δf) 1 Corresponding T s Different), in this case, the above tenth information indicates the correspondence relationship of the value of p, the number of symbols of the reference signal, and the CP length of the symbols of the reference signal in the first time unit as shown in table 13 below.
TABLE 13
Illustratively, when the value of the tenth information is 0, the value of p is 3/5, the number of symbols of the reference signal is 1, and the cyclic prefix length of the symbols of the reference signal is 728; when the value of the tenth information is 3, the value of p is 3/4, the number of symbols of the reference signal is 2, and the cyclic prefix length of the symbols of the reference signal is 418; when the value of the tenth information is 6, the value of p is 1/2, the number of symbols of the reference signal is 3, and the cyclic prefix length of the symbols of the reference signal is 216; when the value of the tenth information is 7, the value of p is 3/4, the number of symbols of the reference signal is 4, and the cyclic prefix length of the symbols of the reference signal is 418.
It should be understood that the correspondence between the value of the tenth information in table 13 and the value of p, the number of symbols of the reference signal, and the cyclic prefix length of the symbols of the reference signal is merely an example, and the embodiment of the present application is not limited thereto.
In another implementation manner of the first aspect, the method for determining a cyclic prefix of a symbol of a reference signal further includes the following three steps:
1. the terminal device receives eleventh information transmitted by the base station device, the eleventh information being usable to indicate the number of symbols of the reference signal on the first time unit.
In one possible implementation, the number N of symbols of the reference signal on the first time unit determined based on the eleventh information rs As shown in table 14 below. Wherein the number of bits corresponding to the value of the eleventh information is 2.
TABLE 14
Value of eleventh information Number of symbols of reference signal
0 1
1 2
2 3
3 4
Specifically, when the value of the eleventh information is 0, the eleventh information indicates that the number of symbols of the reference signal on the first time unit is 1; when the value of the eleventh information is 1, the eleventh information indicates that the number of symbols of the reference signal at the first time unit is 2; when the value of the eleventh information is 2, the eleventh information indicates that the number of symbols of the reference signal at the first time unit is 3; when the value of the eleventh information is 3, the eleventh information indicates that the number of symbols of the reference signal is 4 at the first time unit.
It should be understood that the correspondence between the value of the eleventh information and the number of symbols of the reference signal in table 14 is merely an example, and the embodiment of the present application is not limited thereto.
2. The terminal device receives twelfth information sent by the base station device, where the twelfth information is used to indicate a ratio between a second subcarrier interval and a first subcarrier interval on the first time unit, where the ratio between the second subcarrier interval and the first subcarrier interval corresponds to the number of symbols of the reference signal on the first time unit indicated by the eleventh information.
3. The terminal equipment determines the cyclic prefix length of the symbol of the reference signal in the first time unit according to the eleventh information and the twelfth information.
In one possible implementation, the reference at the first time unit indicated based on the eleventh informationThe cyclic prefix length of the symbols of the reference signal determined by the ratio of the number of symbols of the signal and the first and second subcarrier spacings indicated by the twelfth information may be as shown in table 15 below. As shown in Table 15, assume L unit =7.5, the first time unit T unit ＝7.5/Δf 1 I.e. the duration of the first time unit can be expressed as the duration of 7.5 symbols of data, and the number of points of the inverse discrete fourier transform corresponding to the symbols of the data
TABLE 15
As can be seen from table 15, the number of bits corresponding to the value of the twelfth information is 2.
For example, when the number of symbols of the reference signal determined by the eleventh information is 1 and the value of the twelfth information is 0, it may be determined that the cyclic prefix length of the symbols of the reference signal at the first time unit is 728; when the number of symbols of the reference signal determined by the eleventh information is 2 and the value of the twelfth information is 1, determining that the cyclic prefix length of the symbols of the reference signal at the first time unit is 216; when the number of symbols of the reference signal determined by the eleventh information is 3 and the value of the twelfth information is 0, determining that the cyclic prefix length of the symbols of the reference signal at the first time unit is 436; when the number of symbols of the reference signal determined by the eleventh information is 4 and the value of the twelfth information is 0, it may be determined that the cyclic prefix length of the symbols of the reference signal at the first time unit is 418.
It should be understood that the correspondence between the value of the twelfth information in table 15 and the value of p, the number of symbols of the reference signal, and the cyclic prefix length of the symbols of the reference signal is merely an example, and the embodiment of the present application is not limited thereto.
According to the method for determining the cyclic prefix length of the reference signal symbol provided by the embodiment of the application, the cyclic prefix length of the reference signal symbol on the first time unit is related to the value of p, and different values of p can correspond to the cyclic prefix lengths of different reference signal symbols. Therefore, the cyclic prefix length of the reference signal symbol can be increased to a certain extent, so that the reference signal can resist larger time bias, orthogonality among the reference signals sent by different terminal devices is ensured, and channel estimation and demodulation performances are improved. Meanwhile, the proper p value can be configured according to different time bias scenes, so that different time bias scenes can be flexibly adapted.
Mode two
In one implementation manner of the second aspect, the terminal device receives thirteenth information sent by the base station device, where the thirteenth information may be used to indicate a sixth corresponding relationship, where the sixth corresponding relationship indicates a corresponding relationship between the ratio p of the second subcarrier spacing to the first subcarrier spacing, the number of symbols of the reference signal, the cyclic prefix length of the symbols of the reference signal, and the cyclic prefix length of the symbols of the data.
It should be understood that in the embodiment of the present application, the cyclic prefix length of the symbol of the reference signal and the cyclic prefix length of the symbol of the data in the first time unit may be the same or different, which is not limited in the embodiment of the present application.
The following describes in detail an example in which the cyclic prefix length of the symbol of the reference signal and the cyclic prefix length of the symbol of the data are identical at the first time unit.
In one possible implementation, when L unit When=7.5, the time unit T unit Is of duration T unit ＝7.5/Δf 1 I.e. the duration of the time unit may be expressed as the duration of the symbols of 7.5 data. And the number of points of the inverse discrete fourier transform corresponding to the sign of the data at the time unitThe ratio of the first subcarrier spacing to the second subcarrier spacing determined by the thirteenth information received by the terminal equipment, the number of symbols of the reference signalThe correspondence between the cyclic prefix length of the symbols of the reference signal and the cyclic prefix length of the symbols of the data is shown in table 16 below.
Table 16
It should be appreciated that the number of points of the inverse discrete fourier transform corresponding to the sign of the data in table 16Merely by way of example. In one possible implementation, when the number of points of the inverse discrete fourier transform corresponding to the sign of the data is related to the data subcarrier spacing, the number of points of the inverse discrete fourier transform corresponding to the sign of the data may be +.>Wherein the value of alpha is defined by the first subcarrier spacing deltaf 1 And (3) determining.
It should also be understood that the correspondence between the value of the thirteenth information in table 16 and the value of p, the number of symbols of the reference signal, the cyclic prefix length of the symbols of the reference signal, and the cyclic prefix length of the symbols of the data is merely an example, and the embodiment of the present application is not limited thereto.
Illustratively, when the value of the thirteenth information is 0, the value of p is 2/3, the number of symbols of the reference signal is 1, and the cyclic prefix length of the symbols of the reference signal and the cyclic prefix length of the symbols of the data are 336; when the value of the thirteenth information is 1, the value of p is 2/5, the number of symbols of the reference signal is 1, and the cyclic prefix length of the symbols of the reference signal and the cyclic prefix length of the symbols of the data are 408; when the value of the thirteenth information is 2, the value of p is 4/5, the number of symbols of the reference signal is 2, and the cyclic prefix length of the symbols of the reference signal and the cyclic prefix length of the symbols of the data are 336; when the thirteenth information has a value of 3, the value of p is 4/5, the number of symbols of the reference signal is 3, and both the cyclic prefix length of the symbols of the reference signal and the cyclic prefix length of the symbols of the data are 256.
In another possible implementation, the terminal device may determine the cyclic prefix length of the symbols of the reference signal according to a ratio of the second subcarrier spacing to the first subcarrier spacing, the number of symbols of the reference signal, and the number of symbols of the data.
Taking the above manner as an example, the terminal device receives fourteenth information sent by the base station device, where the fourteenth information may be used to indicate a seventh correspondence, where the seventh correspondence is used to indicate a correspondence between a ratio between the second subcarrier interval and the first subcarrier interval, a number of symbols of the reference signal, a number of symbols of the data, and a cyclic prefix length of the symbols of the reference signal.
In one possible implementation, at L unit Time unit T when=7.5 unit The duration of (2) can be expressed as: t (T) unit ＝7.5/Δf 1 I.e. the duration of the time unit is understood to be the duration of the symbols of 7.5 data. Point number of inverse discrete fourier transform corresponding to sign of dataThe duration of the symbols of the data is 1/Δf 1 Seconds (different Δf) 1 Corresponding T s Different), in this case, the fourteenth information indicates a correspondence relationship of the value of p, the number of symbols of the reference signal, the number of symbols of the data, and the CP length of the symbols of the reference signal within the first time unit as shown in table 17 below.
TABLE 17
In one possible implementation, at L unit Time unit T when=15 unit The duration of (2) can be expressed as: t (T) unit ＝15/Δf 1 I.e. the duration of the time unit is understood to be the duration of the symbols of 15 data. Inverse discrete fourier transform of symbol correspondence of dataTransformed pointsThe duration of the symbols of the data is 1/Δf 1 Seconds (different Δf) 1 Corresponding T s Different), in this case, the above fourteenth information indicates the correspondence relationship of the value of p, the number of symbols of the reference signal, the number of symbols of the data, and the CP length of the symbols of the reference signal in the first time unit as shown in table 18 below.
TABLE 18
/>
Illustratively, when the value of the fourteenth information is 0, the value of p is 3/5, the number of symbols of the reference signal is 1, the number of symbols of the data is 12, and the cyclic prefix length of the symbols of the reference signal is 728, as shown in table 18; when the value of the fourteenth information is 3, the value of p is 3/4, the number of symbols of the reference signal is 2, the number of symbols of the data is 11, and the cyclic prefix length of the symbols of the reference signal is 418; when the value of the fourteenth information is 6, the value of p is 1/2, the number of symbols of the reference signal is 3, the number of symbols of the data is 8, and the cyclic prefix length of the symbols of the reference signal is 216; when the value of the fourteenth information is 7, the value of p is 3/4, the number of symbols of the reference signal is 4, the number of symbols of the data is 8, and the cyclic prefix length of the symbols of the reference signal is 418.
In one possible implementation manner, similar to the second manner described above, the terminal device receives fifteenth information sent by the base station device, where the fifteenth information may be used to indicate a seventh corresponding relationship, where the seventh corresponding relationship indicates a corresponding relationship between the ratio of the second subcarrier spacing to the first subcarrier spacing, the number of symbols of the reference signal, the number of symbols of the data, the cyclic prefix length of the symbols of the reference signal, and the cyclic prefix length of the symbols of the data.
In one possible implementation, when L unit When=7.5, the time unit T unit Is of duration T unit ＝7.5/Δf 1 I.e. the duration of the time unit may be expressed as the duration of the symbols of 7.5 data. And the number of points of the inverse discrete fourier transform corresponding to the sign of the data at the time unitThe correspondence between the ratio of the second subcarrier spacing to the first subcarrier spacing, the number of symbols of the reference signal, the number of symbols of the data, the cyclic prefix length of the symbols of the reference signal and the cyclic prefix length of the symbols of the data, which are determined by the fifteenth information received by the terminal device, is shown in table 19 below.
TABLE 19
Illustratively, when the value of the fifteenth information is 0, the value of p is 2/3, the number of symbols of the reference signal is 1, the number of symbols of the data is 5, and the cyclic prefix length of the symbols of the reference signal and the cyclic prefix length of the symbols of the data are 336; when the value of the fifteenth information is 1, the value of p is 2/5, the number of symbols of the reference signal is 1, the number of symbols of the data is 4, and the cyclic prefix length of the symbols of the reference signal and the cyclic prefix length of the symbols of the data are 408; when the value of the fifteenth information is 2, the value of p is 4/5, the number of symbols of the reference signal is 2, the number of symbols of the data is 4, and the cyclic prefix length of the symbols of the reference signal is 336; when the value of the fifteenth information is 3, the value of p is 4/5, the number of symbols of the reference signal is 3, the number of symbols of the data is 3, and the cyclic prefix length of the symbols of the reference signal and the cyclic prefix length of the symbols of the data are 256.
According to the method for determining the cyclic prefix length of the symbol of the reference signal provided by the application, in the embodiment, the cyclic prefix length of the symbol of the reference signal and the cyclic prefix length of the symbol of the data are related to the value of p, and different values of p can correspond to the cyclic prefix lengths of the symbol of the different reference signals and the cyclic prefix length of the symbol of the data. Therefore, the cyclic prefix length of the reference signal symbols and the cyclic prefix length of the data symbols can be increased, so that the reference signal symbols and the data symbols can resist larger time bias, orthogonality among the reference signals sent by different terminal devices is ensured, interference of the data sent by different terminal devices is reduced, and channel estimation and demodulation performances are improved. Meanwhile, the proper p value can be configured according to different time bias scenes, so that different time bias scenes can be flexibly configured.
Fig. 7 is a schematic flow chart diagram of another example method for determining a cyclic prefix length of a symbol of a reference signal provided by an implementation of the present application. As shown in fig. 7, the method 700 includes steps S701 to S703. Next, step S701 to step S703 will be described in detail by taking uplink transmission as an example.
S701, a second subcarrier spacing and a ratio of the first subcarrier spacing to the second subcarrier spacing are obtained.
It should be understood that step S701 is the same as or similar to step 301 in the method 300 described above, and will not be repeated here for brevity.
S702, the number of symbols of the reference signal on the first time unit is acquired.
It should be appreciated that step 702 is the same as or similar to step 302 in method 300 described above, and is not repeated here for brevity.
S703, determining the cyclic prefix length of the reference signal according to the ratio of the first subcarrier spacing to the second subcarrier spacing and the number of symbols of the reference signal.
It should be appreciated that step 703 is the same as or similar to step 303 in the method 300 described above, and is not repeated here for brevity.
According to the method for determining the cyclic prefix length of the reference signal symbol provided by the method 700, the terminal equipment determines the cyclic prefix length of the reference signal according to the ratio of the first subcarrier interval to the second subcarrier interval and the number of the reference signal symbols, and the cyclic prefix length of the reference signal symbol and the cyclic prefix length of the data symbol can be increased, so that the reference signal symbol and the data symbol can resist larger time bias, orthogonality between the reference signals sent by different terminal equipment is ensured, interference of the data sent by different terminal equipment is reduced, and channel estimation and demodulation performance are improved.
Fig. 8 is a schematic flow chart diagram of another example method for determining a cyclic prefix length of a symbol of a reference signal provided by an implementation of the present application. As shown in fig. 8, the method 800 includes steps S801 to S803. Next, step S801 to step S803 will be described in detail with uplink transmission as an example.
S801, a second subcarrier spacing and a ratio of the second subcarrier spacing to the first subcarrier spacing are obtained.
It should be appreciated that step 801 is the same as or similar to step 601 in method 600 described above, and is not repeated here for brevity.
S802, the number of symbols of the reference signal on the first time unit is acquired.
It should be appreciated that step 802 is the same as or similar to step 602 in method 600 described above, and is not repeated here for brevity.
S803, determining the cyclic prefix length of the reference signal according to the ratio of the second subcarrier spacing to the first subcarrier spacing and the number of symbols of the reference signal.
It should be appreciated that step 803 is the same as or similar to step 603 in method 600 described above, and is not repeated here for brevity.
According to the method for determining the cyclic prefix length of the reference signal symbol provided by the method 800, the terminal device determines the cyclic prefix length of the reference signal according to the ratio of the second subcarrier interval to the first subcarrier interval and the number of the reference signal symbols, and the cyclic prefix length of the reference signal symbol and the cyclic prefix length of the data symbol can be increased, so that the reference signal symbol and the data symbol can resist larger time bias, orthogonality between the reference signals sent by different terminal devices is ensured, interference of the data sent by different terminal devices is reduced, and channel estimation and demodulation performance are improved.
Fig. 9 is a schematic flow chart diagram of another example method for determining a cyclic prefix length of a symbol of a reference signal provided by an implementation of the present application. As shown in fig. 9, the method 900 includes steps S901 to S903. Next, step S901 to step S903 will be described in detail by taking uplink transmission as an example.
S901, a first subcarrier spacing and a second carrier spacing are acquired.
It should be appreciated that step 901 is the same as or similar to step 201 in the method 200 described above, and is not repeated here for brevity.
S902, the number of symbols of the reference signal on the first time unit is acquired.
It should be appreciated that step 902 is the same as or similar to step 202 in the method 200 described above, and is not repeated here for brevity.
S903, determining the cyclic prefix length of the symbol of the reference signal according to the ratio of the first subcarrier spacing to the second subcarrier spacing and the number of symbols of the reference signal; or determining the cyclic prefix length of the symbols of the reference signal according to the ratio of the second subcarrier spacing to the first subcarrier spacing and the number of symbols of the reference signal.
It should be appreciated that the ratio of the first subcarrier spacing to the second subcarrier spacing may be determined by the first subcarrier spacing and the second carrier spacing, or the ratio of the second subcarrier spacing to the first subcarrier spacing may be determined by the first subcarrier spacing and the second carrier spacing.
It should be appreciated that step 903 is the same as or similar to step 303 or 603 in method 300 or method 600 described above, and is not repeated here for brevity.
According to the method for determining the cyclic prefix length of the symbol of the reference signal provided by the method 900 of the present application, the terminal device determines the cyclic prefix length of the symbol of the reference signal according to the ratio of the first subcarrier interval to the second subcarrier interval and the number of symbols of the reference signal; or determining the cyclic prefix length of the reference signal according to the ratio of the second subcarrier interval to the first subcarrier interval and the number of the reference signal symbols, the cyclic prefix length of the reference signal symbols and the cyclic prefix length of the data symbols can be increased, so that the reference signal symbols and the data symbols can resist larger time bias, orthogonality between the reference signals sent by different terminal devices is ensured, interference of the data sent by different terminal devices is reduced, and channel estimation and demodulation performances are improved.
In the embodiment of the application, the reference signal sent by the terminal equipment may be a Zad-offChu sequence (or referred to as a ZC sequence). Specifically, in the embodiment of the present application, the length of the reference signal may be set to be proportional to the value of k, the root of the reference signal (for example, the root of the ZC sequence) is proportional to the value of k, and the number of cyclic shifts of the reference signal (for example, the number of cyclic shifts of the ZC sequence) is proportional to the value of k.
The reference signal may be expressed as r, and the length of the reference signal may be expressed as M rs . The reference signal may be generated by the following method:
r(n)＝x(n mod N ZC ),n＝0,1,2,…,M rs -1 (5)
where r (n) is denoted as the nth value of r, mod is modulo arithmetic, and n is the index of the element in the sequence x.
When the reference signal is a ZC sequence, the above formula (5) can be expressed as follows:
wherein x represents a length N ZC Is a ZC sequence of (2); x (m) is the mth value of x; q is the root of ZC sequence, q is an integer and q and N ZC Mutual quality; n (N) ZC Is the length of ZC sequence; j is an imaginary unit, and the square of j is equal to-1; pi is the circumference ratio.
In one implementation, in an NR system, the root q of the ZC sequence can be expressed as:
wherein v has a value of 0 or 1; n (N) root Represents the number of ZC sequence roots, and the N root May be a predefined positive integer; u has a value of 0 to N root -1; sign symbolThe representation is rounded down.
In another implementation, when the symbol of the reference signal is an OFDM symbol, the reference signal r may be mapped into a frequency domain resource to obtain frequency domain data, and the frequency domain data is subjected to inverse fourier transform to obtain the OFDM symbol.
In this embodiment of the present application, the length of the reference signal is proportional to the value of k, which may be specifically expressed as:
M rs ＝kM rs,base (9)
Wherein M is rs,base Length of the reference signal based on the M rs,base The value of (2) may be determined by the bandwidth of the data. For example, M when the reference signal is mapped continuously in the frequency domain resource rs,base The value of (2) may correspond to the number of subcarriers corresponding to the bandwidth of the data.
In the embodiment of the application, the number of roots of the ZC sequence is proportional to the value of k. For example, the number of roots of ZC sequences is N root And the following conditions are satisfied:
N root ＝[kN root,base ] (10)
or,
or,
wherein M is root,base Number of roots of the based ZC sequence, N root,base May be determined in a predefined manner or by the base stationThe device informs the terminal device by means of signaling, which is not limited in the embodiment of the present application. For example, N root,base =30. Sign "[]"means rounding and signLower rounding, sign->The representation is rounded up.
Alternatively, in a possible implementation manner, the shift reference signal may be obtained by performing cyclic shift on the reference signal, and the terminal device sends the shift reference signal. Wherein, the number of cyclic shifts is proportional to the value of k. The shifted reference signal may be denoted as r cs Specifically, the shift reference signal r cs The relationship with the reference signal r can be expressed as:
or,
wherein r is cs (n) is r cs N-th value of (3), phase factor in equation (13) Can be called cyclic shift factor, parameter->The number of values of (a) is expressed as the number of cyclic shifts, specifically as N cs . The number of cyclic shifts N cs The relationship with the value of k can be expressed as follows:
or,
or,
wherein N is cs,base Expressed as the number of basic cyclic shifts, N cs,base The terminal device may be determined in a predefined manner or signaled by the base station device, which is not limited by the embodiments of the present application.
In one possible implementation, the above parametersThe value of (2) can be expressed as:
wherein alpha is cs For cyclic shift index, the value range is 0 to N cs -1. The cyclic shift index may be determined in a predefined manner or signaled to the terminal device by the base station device, which is not limited by the embodiments of the present application.
Specifically, the reference signal r is mapped into the frequency domain resource to obtain the frequency domain resource, and the reference signal can realize continuous mapping in the frequency domain resource, and also can realize comb mapping, and the comb size is related to the value of k, for example: the comb size may be proportional to the rounding of k.
In one possible implementation, when the comb size is 2, the reference signal may be mapped within an odd subcarrier of the frequency domain resource or within an even subcarrier of the frequency domain resource.
According to the method provided by the embodiment of the application, the length of the reference signal is in direct proportion to the value of k, the reference signal is a ZC sequence, the number of roots of the ZC sequence is in direct proportion to the value of k, and the number of cyclic shifts of the reference signal is in direct proportion to the value of k. Therefore, the number of orthogonal or quasi-orthogonal reference signals can be increased, the probability of collision when a plurality of terminal devices send the reference signals is reduced, and further the channel estimation and demodulation performance is improved.
The method embodiments of the present application are described above in detail with reference to fig. 1 to 5, and the device side embodiments provided by the embodiments of the present application are described below in detail with reference to fig. 6 and 7. It should be understood that the description of the method-side embodiments in the embodiments of the present application corresponds to the description of the apparatus-side embodiments, and thus, portions not described in detail may be referred to the description of the method-side implementation above.
Fig. 10 is a schematic structural diagram of an exemplary communication device according to an embodiment of the present application. The communication apparatus 1000 in fig. 10 may be a specific example of the terminal device #1 or the base station in fig. 1. The communication device shown in fig. 10 may be used to perform the methods of fig. 2, 3 and 6 to 9, and will not be described here again for brevity.
The communication device 1000 shown in fig. 10 may include an acquisition unit 1010 and a processing unit 1020.
Specifically, the acquiring unit 1010 is configured to acquire a first subcarrier interval and a second subcarrier interval, where the first subcarrier interval is used for transmitting data on a first time unit, and the second subcarrier interval is used for transmitting a reference signal on the first time unit, and the first subcarrier interval is greater than the second subcarrier interval.
The obtaining unit 1010 is further configured to obtain the first number, where the first number is the number of symbols of the reference signal in the first time unit.
A processing unit 1020 is configured to determine a cyclic prefix length of the symbol of the reference signal according to the first subcarrier spacing, the second subcarrier spacing, and the first number.
In a possible implementation, the obtaining unit 1010 is further configured to obtain a first ratio.
Wherein the first ratio comprises a ratio of the first subcarrier spacing to the second subcarrier spacing, or a ratio of the second subcarrier spacing to the first subcarrier spacing.
In this embodiment of the present application, the first ratio may be a predefined value, or may be a value that is sent by the base station device to the terminal device through signaling.
The processing unit 1020 is further configured to determine a second subcarrier spacing according to the first ratio.
It should be understood that in the embodiment of the present application, the first ratio may be a predefined value, or may be a value that is sent by the base station device to the terminal device through signaling.
In one possible implementation, the processing unit 1020 is further configured to determine a cyclic prefix length of the symbol of the reference signal according to the first ratio and the first number.
Optionally, the obtaining unit 1010 is further configured to obtain a first correspondence, where the first correspondence is used to indicate a correspondence between a first parameter set and a first cyclic prefix length, and the first parameter set includes a first number and at least two of the following parameters: a first subcarrier spacing, a second subcarrier spacing, a first ratio;
the processing unit 1020 is further configured to determine, according to the first correspondence, a first cyclic prefix length corresponding to the first parameter set as a cyclic prefix length of a symbol of the reference signal.
Optionally, in a possible implementation manner, the obtaining unit 1010 is further configured to obtain information a, where the information a is used to indicate the first correspondence.
Optionally, in one possible implementation manner, the obtaining unit 1010 is further configured to obtain a second correspondence, where the second correspondence is used to indicate a correspondence between a second parameter set and the first cyclic prefix length and the second cyclic prefix length, and the second parameter set includes a first number and at least two of the following parameters: a first subcarrier spacing, a second subcarrier spacing, a first ratio;
The processing unit 1020 is further configured to determine, according to the second correspondence, a first cyclic prefix length corresponding to the second parameter set as a cyclic prefix length of a symbol of the reference signal, and determine a second cyclic prefix length corresponding to the second parameter set as a cyclic prefix length of a symbol of the data.
Optionally, in a possible implementation manner, the obtaining unit 1010 is further configured to obtain information B, where the information B is used to indicate the second correspondence.
In a possible implementation, the obtaining unit 1010 is further configured to obtain information C, where the information C is used to indicate the first number. The obtaining unit 1010 is further configured to obtain information D, where the information D is used to indicate a first ratio corresponding to the first number or a first subcarrier spacing and a second subcarrier spacing corresponding to the first number.
The processing unit 1020 is further configured to determine a cyclic prefix length of the symbols of the reference signal based on the information C and the information D, or the processing unit 1020 is further configured to determine a cyclic prefix length of the symbols of the reference signal and a cyclic prefix length of the symbols of the data based on the information C and the information D.
Specifically, the first ratio includes one or more of the following: 5/4, 4/3, 3/2, 5/3, 2, 25/12, 9/4, 5/2, 8/3, 3.
In one possible implementation, the reference signal may be a ZC sequence, the length of the reference signal being in a proportional relationship with a first value, the number of roots of the ZC sequence being in a proportional relationship with the first value, the number of cyclic shifts of the reference signal being in a proportional relationship with the first value, wherein the first value comprises a ratio of the first subcarrier spacing to the second subcarrier spacing.
The above-described apparatus is embodied in the form of a functional unit. The term "unit" herein may be implemented in software and/or hardware, without specific limitation.
For example, a "unit" may be a software program, a hardware circuit or a combination of both that implements the functions described above. The hardware circuitry may include application specific integrated circuits (application specific integrated circuit, ASICs), electronic circuits, processors (e.g., shared, proprietary, or group processors, etc.) and memory for executing one or more software or firmware programs, merged logic circuits, and/or other suitable components that support the described functions.
Thus, the elements of the examples described in the embodiments of the present application can be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
Fig. 11 is a schematic structural diagram of a communication device provided in an embodiment of the present application. The communication apparatus 1100 in fig. 11 may be a specific example of the terminal device #1 or the base station in fig. 1. The communication device shown in fig. 11 may be used to perform the methods of fig. 2, 3 and 6 to 9, and will not be described here again for brevity.
The communication device may be a terminal device or a network device, or may be a device in a terminal device or a network device, or may be a device that can be used in a matching manner with a terminal device or a network device. Wherein the communication device may be a system-on-chip. In the embodiment of the application, the chip system may be formed by a chip, and may also include a chip and other discrete devices. The communication device 1100 comprises at least one processor 1100 for implementing the methods provided by the embodiments of the present application. For example, the processor 1120 may be configured to determine the cyclic prefix length of the symbol of the reference signal according to the first subcarrier spacing, the second subcarrier spacing and the number of symbols of the reference signal, which is specifically referred to in the above detailed description of the method side example and will not be repeated here. Optionally, the function of processor 1120 is the same as the function of processing unit 1020 in fig. 10.
The communications apparatus 1100 can also include at least one memory 1110 for storing program instructions and/or data. Memory 1110 is coupled to processor 1120. The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units, or modules, which may be in electrical, mechanical, or other forms for information interaction between the devices, units, or modules. Processor 1120 may operate in conjunction with memory 1110. Processor 1120 may execute program instructions stored in memory 1110. At least one of the at least one memory may be included in the processor.
The communications apparatus 1100 can also include a communications interface 1130 for communicating with other devices over a transmission medium, such that the apparatus for use in the communications apparatus 1100 can communicate with other devices. By way of example, the communication interface may be a transceiver, circuit, bus, module, pin, or other type of communication interface. Illustratively, the communications apparatus 1100 is a terminal device and the other device is a network device. The processor 1120 transmits and receives data using the communication interface 1130 and is used to implement the methods performed by the terminal device described in the corresponding embodiments of fig. 2, 3 and 6 to 9.
The specific connection medium between the memory 1110, the processor 1120, and the communication interface 1130 is not limited in the embodiments of the present application. In the embodiment of the present application, the memory 1110, the processor 1120 and the communication link 1130 are connected by a bus 1140 in fig. 11, where the bus is indicated by a thick line in fig. 11, and the connection manner between other components is only schematically illustrated, but not limited to. The bus may be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus, or the like. The buses may be classified as address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in FIG. 11, but not only one bus or one type of bus.
It should be appreciated that the processor in embodiments of the present application may be a central processing unit (central processing unit, CPU), but may also be other general purpose processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), off-the-shelf programmable gate arrays (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
It should also be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example but not limitation, many forms of random access memory (random access memory, RAM) are available, such as Static RAM (SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced Synchronous Dynamic Random Access Memory (ESDRAM), synchronous Link DRAM (SLDRAM), and direct memory bus RAM (DR RAM).
The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the processes or functions described in accordance with the embodiments of the present application are all or partially produced. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. 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, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wired (e.g., 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, data center, etc. that contains one or more sets of available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. The semiconductor medium may be a solid state disk.
It should be understood that the term "and/or" is merely an association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B may mean: there are three cases, a alone, a and B together, and B alone, wherein a, B may be singular or plural. In addition, the character "/" herein generally indicates that the associated object is an "or" relationship, but may also indicate an "and/or" relationship, and may be understood by referring to the context.
In the present application, "at least one" means one or more, and "a plurality" means two or more. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural.
It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (25)

1. A method of determining a cyclic prefix length of a symbol of a reference signal, comprising:
acquiring a first subcarrier interval and a second subcarrier interval, wherein the first subcarrier interval is used for transmitting data on a first time unit, and the second subcarrier interval is used for transmitting a reference signal on the first time unit, and the first subcarrier interval is larger than the second subcarrier interval;
acquiring a first number, wherein the first number is the number of symbols of a reference signal to be sent on the first time unit;
a cyclic prefix length of symbols of the reference signal is determined from the first subcarrier spacing, the second subcarrier spacing, and the first number.
2. The method of claim 1, wherein the acquiring the first subcarrier spacing and the second subcarrier spacing comprises:
Acquiring the first subcarrier spacing and a first ratio, wherein the first ratio comprises a ratio of the first subcarrier spacing to the second subcarrier spacing or a ratio of the second subcarrier spacing to the first subcarrier spacing;
and determining the second subcarrier spacing according to the first subcarrier spacing and the first ratio.
3. The method according to claim 1 or 2, wherein said determining the cyclic prefix length of the symbols of the reference signal from the first subcarrier spacing, the second subcarrier spacing and the first number comprises:
a cyclic prefix length of symbols of the reference signal is determined from a first ratio and the first number, the first ratio comprising a ratio of the first subcarrier spacing to the second subcarrier spacing or a ratio of the second subcarrier spacing to the first subcarrier spacing.
4. The method of claim 3, wherein the determining the cyclic prefix length of the symbols of the reference signal based on the first subcarrier spacing, the second subcarrier spacing, and the first number comprises:
acquiring a first corresponding relation, wherein the first corresponding relation is used for indicating a corresponding relation between a first parameter set and a first cyclic prefix length, and the first parameter set comprises the first number and at least two of the following parameters: the first subcarrier spacing, the second subcarrier spacing, the first ratio;
And according to the first corresponding relation, determining a first cyclic prefix length corresponding to the first parameter set as the cyclic prefix length of the symbol of the reference signal.
5. The method according to claim 4, wherein the method further comprises:
and acquiring first information, wherein the first information is used for indicating the first corresponding relation.
6. The method of claim 3, wherein the determining the cyclic prefix length of the symbols of the reference signal based on the first subcarrier spacing, the second subcarrier spacing, and the first number comprises:
obtaining a second corresponding relation, wherein the second corresponding relation is used for indicating a corresponding relation between a second parameter set and a first cyclic prefix length and a second cyclic prefix length, and the second parameter set comprises the first number and at least two parameters as follows: the first subcarrier spacing, the second subcarrier spacing, the first ratio;
and according to the second corresponding relation, determining the first cyclic prefix length corresponding to the second parameter set as the cyclic prefix length of the symbol of the reference signal, and determining the second cyclic prefix length corresponding to the second parameter set as the cyclic prefix length of the symbol of the data.
7. The method of claim 6, wherein the method further comprises:
and acquiring second information, wherein the second information is used for indicating the second corresponding relation.
8. A method according to any one of claims 1 to 3, further comprising:
third information is acquired, the third information being used to indicate the first number.
9. The method of claim 8, wherein the method further comprises:
obtaining fourth information, where the fourth information is used to indicate a first ratio corresponding to the first number or a ratio of the first subcarrier spacing to the second subcarrier spacing corresponding to the first number, where the first ratio includes a ratio of the first subcarrier spacing to the second subcarrier spacing or a ratio of the second subcarrier spacing to the first subcarrier spacing;
determining the cyclic prefix length of the symbol of the reference signal according to the third information and the fourth information,
or determining the cyclic prefix length of the symbol of the reference signal and the cyclic prefix length of the symbol of the data according to the third information and the fourth information.
10. The method of any one of claims 2, 3, 4, 6, 9, wherein the first ratio comprises one or more of:
5/4、4/3、3/2、5/3、2、25/12、9/4、5/2、8/3、3。
11. The method according to any of claims 1 to 10, wherein the reference signal is a ZC sequence, wherein the length of the reference signal is proportional to a first value, wherein the first value comprises a ratio of the first subcarrier spacing to the second subcarrier spacing, wherein the number of roots of the ZC sequence is proportional to the first value, wherein the number of cyclic shifts of the reference signal is proportional to the first value.
12. An apparatus for determining a cyclic prefix length of a symbol of a reference signal, comprising:
an acquisition unit configured to acquire a first subcarrier spacing and a second subcarrier spacing, where the first subcarrier spacing is used for transmitting data on a first time unit, and the second subcarrier spacing is used for transmitting a reference signal on the first time unit, and the first subcarrier spacing is greater than the second subcarrier spacing;
the acquiring unit is further configured to acquire a first number, where the first number is a number of symbols of a reference signal to be transmitted on a first time unit;
a processing unit, configured to determine a cyclic prefix length of a symbol of the reference signal according to the first subcarrier spacing, the second subcarrier spacing, and the first number.
13. The apparatus of claim 12, wherein the means for obtaining is further configured to obtain the first subcarrier spacing and a first ratio, wherein the first ratio comprises a ratio of the first subcarrier spacing to the second subcarrier spacing or a ratio of the second subcarrier spacing to the first subcarrier spacing;
the processing unit is further configured to determine the second subcarrier spacing according to the first subcarrier spacing and the first ratio.
14. The apparatus according to claim 12 or 13, wherein the processing unit is further configured to determine a cyclic prefix length of the reference signal symbol according to a first ratio and the first number, the first ratio comprising a ratio of the first subcarrier spacing to the second subcarrier spacing or a ratio of the second subcarrier spacing to the first subcarrier spacing.
15. The apparatus of claim 14, wherein the device comprises a plurality of sensors,
the obtaining unit is further configured to obtain a first correspondence, where the first correspondence is used to indicate a correspondence between a first parameter set and a first cyclic prefix length, and the first parameter set includes the first number and at least two parameters as follows: the first subcarrier spacing, the second subcarrier spacing, the first ratio;
The processing unit is further configured to determine, according to the first correspondence, a first cyclic prefix length corresponding to the first parameter set as a cyclic prefix length of a symbol of the reference signal.
16. The apparatus of claim 15, wherein the obtaining unit is further configured to obtain first information, the first information being used to indicate the first correspondence.
17. The apparatus of claim 14, wherein the device comprises a plurality of sensors,
the obtaining unit is further configured to obtain a second correspondence, where the second correspondence is used to indicate a correspondence between a second parameter set and a first cyclic prefix length and a second cyclic prefix length, and the second parameter set includes the first number value and at least two parameters as follows: the first subcarrier spacing, the second subcarrier spacing, the first ratio;
the processing unit is further configured to determine, according to the second correspondence, the first cyclic prefix length corresponding to the second parameter set as a cyclic prefix length of a symbol of the reference signal, and determine the second cyclic prefix length corresponding to the second parameter set as a cyclic prefix length of a symbol of the data.
18. The apparatus of claim 17, wherein the obtaining unit is further configured to obtain second information, the second information being used to indicate the second correspondence.
19. The apparatus according to any one of claims 12 to 14, wherein the obtaining unit is further configured to obtain third information, the third information being used to indicate the first number.
20. The apparatus of claim 19, wherein the means for obtaining is further configured to obtain fourth information, the fourth information being configured to indicate a first ratio corresponding to the first number or the first subcarrier spacing to the second subcarrier spacing corresponding to the first number, the first ratio comprising a ratio of the first subcarrier spacing to the second subcarrier spacing or a ratio of the second subcarrier spacing to the first subcarrier spacing;
the processing unit is further configured to determine a cyclic prefix length of a symbol of the reference signal according to the third information and the fourth information,
or the processing unit is further configured to determine a cyclic prefix length of a symbol of the reference signal and a cyclic prefix length of a symbol of the data according to the third information and the fourth information.
21. The apparatus of any one of claims 13, 14, 15, 17, 20, wherein the first ratio comprises one or more of:
5/4、4/3、3/2、5/3、2、25/12、9/4、5/2、8/3、3。
22. the apparatus of any of claims 12-21, wherein the reference signal is a ZC sequence, a length of the reference signal is proportional to a first value, a number of roots of the ZC sequence is proportional to the first value, a number of cyclic shifts of the reference signal is proportional to the first value, wherein the first value comprises a ratio of the first subcarrier spacing to the second subcarrier spacing.
23. An apparatus for determining a cyclic prefix length of a symbol of a reference signal, comprising a processor and a memory, the memory for storing program instructions, the processor for invoking the program instructions to perform the method of any of claims 1-11.
24. A computer readable storage medium, characterized in that the computer readable storage medium stores program code for device execution, the program code comprising instructions for performing the method of any of claims 1 to 11.
25. A chip comprising a processor and a data interface, the processor reading instructions stored on a memory via the data interface to perform the method of any one of claims 1 to 11.
CN202210690218.9A 2022-06-17 2022-06-17 Method and apparatus for determining cyclic prefix length of symbols of reference signal Pending CN117294565A (en)

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KR102127753B1 (en) * 2016-09-23 2020-06-30 주식회사 케이티 Apparatus and method for configuring and detecting a length of a cyclic prefix in a cell supporting a plurality of subcarrier spacing
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