Patent Description:
In new radio (New Radio, NR) mobile communication systems of the related art, in a case that transmission precoding (also referred to as a discrete Fourier transform spread orthogonal frequency division multiplexing (Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing, DFT-s-OFDM) waveform) is employed on a physical uplink shared channel (Physical Uplink Shared Channel, PUSCH) or a physical uplink control channel (Physical Uplink Control Channel, PUCCH), low peak-to-average power ratios (Peak-to-Average Power Ratio, PAPR) of demodulation reference signals (Demodulation Reference Signal, DMRS) are higher than PAPRs of data symbols and uplink coverage performance is poor because a DMRS sequence is generated using a PAPR sequence (also referred to as a Zadoff-Chu (ZC) sequence) or a pseudo-noise (pseudo-noise, PN) sequence.

A 3GPP draft R1-<NUM> discusses low PAPR reference signal.

A 3GPP draft R1-<NUM> discusses sequence design for Pi/<NUM>-BPSK DFT-S-OFDM.

A 3GPP draft R1-<NUM> discusses proposal on length-<NUM>, length-<NUM>, and length-<NUM> CG sequences for pi/<NUM> BPSK.

Embodiments of this disclosure provide a transmission method and a first communication device as defined in accompanying claims, to resolve related-art problems that PAPRs of DMRS symbols are higher than PAPRs of data symbols and uplink coverage performance is poor because a DMRS sequence is generated using a ZC sequence or a PN sequence.

In the embodiments of this disclosure, the first communication device transmits the target reference signal that belongs to the first type of reference signal in a case that the indication information from the second communication device is received and indicates transmission of the first type of reference signal, where the reference signal sequence of the first type of reference signal is generated based on the first characteristic. In this way, a PAPR of the target reference signal transmitted in the embodiments of this disclosure is lower than that in the related art, thereby improving power amplification efficiency of a signal transmit end, reducing power consumption, improving demodulation performance of a signal receive end, and improving uplink coverage.

To describe the technical solutions in the embodiments of this disclosure more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments of this disclosure. Apparently, the accompanying drawings in the following description show merely some embodiments of this disclosure, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.

The following clearly and completely describes the technical solutions in the embodiments of this disclosure with reference to the accompanying drawings in the embodiments of this disclosure. Apparently, the described embodiments are merely some rather than all of the embodiments of this disclosure.

The terms "first", "second", and the like in this application are used to distinguish between similar objects instead of describing a specific order or sequence. In addition, the terms "include", "have", and any other variant thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that includes a list of steps or units is not necessarily limited to those steps or units that are expressly listed, but may include other steps or units that are not expressly listed or are inherent to the process, method, product, or device. In addition, the use of "and/or" in this application represents presence of at least one of the connected objects. For example, A and/or B and/or C represents the following seven cases: A alone, B alone, C alone, both A and B, both B and C, both A and C, and all of A, B, and C.

For ease of understanding, the following describes some content involved in the embodiments of this disclosure:.

In the embodiments of this disclosure, a first communication device may be a terminal, and a second communication device may be a network-side device; or a first communication device may be a network-side device, and a second communication device may be a terminal.

<FIG> is a structural diagram of a network system applicable to an embodiment of this disclosure. As shown in <FIG>, a terminal <NUM> and a network-side device <NUM> are included, and the terminal <NUM> and the network-side device <NUM> may communicate with each other.

In this embodiment of this disclosure, the terminal <NUM> may also be referred to as user equipment (User Equipment, UE). In actual implementation, the terminal <NUM> may be a terminal-side device such as a mobile phone, a tablet personal computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a personal digital assistant (Personal Digital Assistant, PDA), a mobile Internet device (Mobile Internet Device, MID), a wearable device (Wearable Device), or an in-vehicle device. It should be noted that a specific type of the terminal <NUM> is not limited in the embodiments of this disclosure.

The network-side device <NUM> may be a base station, a relay, an access point, or the like. The base station may be a <NUM>th generation (<NUM>th generation, <NUM>) base station or a base station of a later release (for example, a <NUM> new radio (New Radio, NR) NodeB (NodeB, NB)), or a base station in another communication system (for example, an evolved NodeB (Evolutional Node B, eNB)). It should be noted that a specific type of the network-side device <NUM> is not limited in the embodiments of this disclosure.

In an NR system, in a case that transmission precoding is employed on a PUSCH, a DMRS sequence is generated using a low PAPR sequence (also referred to as a ZC sequence) as follows: <MAT> <MAT> where n represents a DMRS symbol identifier; δ=<NUM>; <MAT> represents the number of subcarriers occupied by the PUSCH; α=<NUM>; and u and ν represent values for group hopping and sequence hopping, respectively.

In a case that transmission precoding is employed on a PUCCH, a DMRS sequence is generated using a low PAPR sequence as follows: <MAT> <MAT> where <MAT> represents the number of subcarriers occupied by the PUCCH.

In a case that a DMRS sequence length is <NUM>, <NUM>, <NUM>, or <NUM>, <MAT> is generated as follows: <MAT> where ϕ(n) is generated through computer search.

In a case that a DMRS sequence length is <NUM>, <MAT> is generated as follows: <MAT>.

In a case that a DMRS sequence length is greater than or equal to <NUM>, <MAT> is generated as follows: <MAT> where MZC is the DMRS sequence length; and NZC is the largest prime number less than MZC.

For computer generated sequences (Computer Generated Sequence, CGS) in the related art, refer to <FIG>. In <FIG>, auto-correlation shift mean may be interpreted as auto correlation shift mean, cross-correlation mean may be interpreted as cross correlation mean, frequency flatness may be interpreted as frequency flatness, the full name of BLER is block error rate, and the full name of SINR is signal-to-interference-plus-noise ratio.

In <FIG>, parameters in bold mainly have the following problems:.

The following describes the transmission method in the embodiments of this disclosure.

<FIG> is a flowchart of a transmission method according to an embodiment of this disclosure. The transmission method in <FIG> is applied to a first communication device.

As shown in <FIG>, the transmission method in this embodiment of this disclosure may include the following step.

Step <NUM>: Transmit a target reference signal that belongs to a first type of reference signal in a case that indication information from a second communication device is received and indicates transmission of the first type of reference signal.

A reference signal sequence of the first type of reference signal is generated based on a first characteristic.

In practical applications, the first communication device may transmit the target reference signal that belongs to the first type of reference signal in a case that transmission precoding is employed on a physical channel or a reference signal, and the indication information indicating transmission of the first type of reference signal is received from the second communication device.

The physical channel may include at least one of a traffic channel, a control channel, and a broadcast channel. The reference signal may at least include at least one of a DMRS and a sounding reference signal (Sounding Reference Signal, SRS).

Specifically, the traffic channel may include at least one of a PUSCH, a physical downlink shared channel (Physical Downlink Shared Channel, PDSCH), and a physical sidelink shared channel (Physical Sidelink Shared Channel, PSSCH). The control channel may include at least one of a PUCCH, a physical downlink control channel (Physical Downlink Control Channel, PDCCH), and a physical sidelink control channel (Physical Sidelink Control Channel, PSCCH). The broadcast channel includes at least a physical broadcast channel (Physical broadcast channel, PBCH).

In practical applications, in a case that the second communication device is a network-side device, optionally, the indication information is transmitted through radio resource control (Radio Resource Control, RRC) signaling or downlink control information (Downlink Control Information, DCI).

It should be noted that the target reference signal may be any reference signal in a reference signal group corresponding to the first type of reference signal. It should be understood that each reference signal in the reference signal group corresponding to the first type of reference signal corresponds to one reference signal sequence and reference signal symbols.

Optionally, reference signal symbols of the first type of reference signal are generated by performing at least one of π/<NUM> binary phase shift keying (Binary Phase Shift Keying, BPSK) modulation, transmission precoding, resource mapping, and inverse fast Fourier transform on the reference signal sequence.

Optionally, the reference signal symbols include:.

The first characteristic includes at least one of the following:.

In a case that the difference between the SINR value corresponding to the first value of the BLER of the target reference signal, and the mean value of the SINR values corresponding to the first values of the BLERs of all the reference signals in the reference signal group corresponding to the first type of reference signal falls within [-<NUM> dB, <NUM> dB], demodulation performance of the reference signal sequence of the first type of reference signal is relatively good. In practical applications, the first value may be <NUM> or <NUM>, but it is not limited thereto.

It should be noted that when the foregoing values are optional, a PARA of the first type of reference signal can be further reduced, thereby improving transmission performance.

In this embodiment of this disclosure, for a CGS, the reference signal sequence of the first type of reference signal generated based on the first characteristic, reference may be made to <FIG> show cross-correlation means with reference CGSs (Cross Correlation Mean with Reference) and reference values.

It can be learned from comparison between CGS performance parameters in <FIG> and <FIG> that.

It can be learned that the sequence of the first type of reference signal being generated based on the first characteristic has at least the following effects:.

In this embodiment of this disclosure, optionally, in a case that the first type of reference signal occupies <NUM> subcarriers, the reference signal sequence includes at least one of the following sequences:.

In <FIG>, parameters for sequences corresponding to index numbers <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM> in bold have higher performance than parameters for sequences corresponding to other index numbers in <FIG>. In addition, the foregoing listed index numbers are arranged in descending order of performance of the parameters for the sequences corresponding to the foregoing listed index numbers. Specifically, parameters for a sequence corresponding to index number <NUM> have higher performance than parameters for sequences corresponding to index numbers <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM>; parameters for a sequence corresponding to index number <NUM> have lower performance than the parameters for the sequence corresponding to index number <NUM>, but higher performance than parameters for sequences corresponding to index numbers <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM>; and so on.

Therefore, further, in a case that the first type of reference signal occupies <NUM> subcarriers, the reference signal sequence includes at least one of sequences corresponding to index numbers <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM>. Specifically, the reference signal sequence includes at least one of the following sequences:.

Optionally, in a case that the first type of reference signal occupies <NUM> subcarriers, the reference signal sequence includes at least one of the following sequences:.

In <FIG>, parameters for sequences corresponding to index numbers <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM> in bold have higher performance than parameters for sequences corresponding to other index numbers in <FIG>. In addition, the foregoing listed index numbers are arranged in descending order of performance of the parameters for the sequences corresponding to the foregoing listed index numbers. Specifically, parameters for a sequence corresponding to index number <NUM> have higher performance than parameters for sequences corresponding to index numbers <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM>; parameters for a sequence corresponding to index number <NUM> have lower performance than the parameters for the sequence corresponding to index number <NUM>, but higher performance than parameters for sequences corresponding to index numbers <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM>; and so on.

Therefore, further, in a case that the first type of reference signal occupies <NUM> subcarriers, the reference signal sequence includes at least one of sequences corresponding to index numbers <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM>. Specifically, the reference signal sequence includes at least one of the following sequences:.

In <FIG>, parameters for sequences corresponding to index numbers <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM> in bold have higher performance than parameters for sequences corresponding to other index numbers in <FIG>. In addition, the foregoing listed index numbers are arranged in descending order of performance of the parameters for the sequences corresponding to the foregoing listed index numbers. Specifically, parameters for a sequence corresponding to index number <NUM> have higher performance than parameters for sequences corresponding to index numbers <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM>; parameters for a sequence corresponding to index number <NUM> have lower performance than the parameters for the sequence corresponding to index number <NUM>, but higher performance than parameters for sequences corresponding to index numbers <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM>; and so on.

Therefore, further, in a case that the first type of reference signal occupies <NUM> subcarriers, the reference signal sequence includes at least one of sequences corresponding to index numbers <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM>. Specifically, the reference signal sequence includes at least one of the following sequences:.

In this embodiment of this disclosure, the first communication device may further transmit a second type of reference signal, to improve flexibility of reference signal transmission by the first communication device. Optionally, the method further includes: transmitting a second type of reference signal in a case that a preset condition is met, where a modulation scheme of the second type of reference signal is quadrature phase shift keying (Quadrature Phase Shift Keying, QPSK), <NUM> quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM), or <NUM> QAM.

The preset condition includes at least one of the following: that the indication information is not received;.

According to the transmission method in this embodiment, the target reference signal that belongs to the first type of reference signal is transmitted in a case that the indication information from the second communication device is received and the indication information indicates transmission of the first type of reference signal, where the reference signal sequence of the first type of reference signal is generated based on the first characteristic. In this way, a PAPR of the target reference signal transmitted in this embodiment is lower than that in the related art, thereby improving power amplification efficiency of a signal transmit end, reducing power consumption, improving demodulation performance of a signal receive end, and improving uplink coverage.

It should be noted that various optional implementations described in this embodiment of this disclosure may be implemented in combination or may be implemented independently, which is not limited in this embodiment of this disclosure.

Main innovation and protection points of this disclosure are as follows:
In a case that transmission precoding (also referred to as a DFT-s-OFDM waveform) is employed on a traffic channel, a control channel, a broadcast channel, or a reference signal, and a network-side device sends indication information to indicate UE to transmit a target reference signal, a reference signal sequence of the target reference signal is generated based on a first characteristic.

A first reference signal symbol of the target reference signal is generated by performing π/<NUM> BPSK modulation on the reference signal sequence; and
a second reference signal symbol of the target reference signal is generated by performing π/<NUM> BPSK modulation and transmission precoding on the reference signal sequence.

The indication information from the network-side device may be indicated through RRC signaling or DCI, and is <NUM> bit in length.

The first characteristic at least includes:.

In a case that a reference signal occupies <NUM> or <NUM> or <NUM> or <NUM> subcarriers, the reference signal is the target reference signal.

Effects and benefits of this disclosure: This disclosure can resolve a problem that PAPRs of DMRS symbols are higher than PAPRs of data symbols in a case that transmission precoding is employed on a PUSCH or PUCCH, so as to improve power amplification efficiency of a transmit end, reduce power consumption, improve demodulation performance of a receive end, and improve uplink coverage.

<FIG> is a first structural diagram of a first communication device according to an embodiment of this disclosure. As shown in <FIG>, the first communication device <NUM> includes:.

Optionally, reference signal symbols of the first type of reference signal are generated by performing at least one of π/<NUM> binary phase shift keying BPSK modulation, transmission precoding, resource mapping, and inverse fast Fourier transform on the reference signal sequence.

Optionally, the first communication device <NUM> further includes:.

Optionally, the indication information is transmitted through radio resource control RRC signaling or DCI.

The first communication device <NUM> can implement the processes in the method embodiments of this disclosure, with the same beneficial effects achieved. To avoid repetition, details are not described herein again.

<FIG> is a second structural diagram of a first communication device according to an embodiment of this disclosure. As shown in <FIG>, in this embodiment not covered by the claims, the first communication device <NUM> includes a memory <NUM>, a processor <NUM>, and a computer program <NUM> stored in the memory <NUM> and capable of running on the processor <NUM>.

When the computer program <NUM> is executed by the processor <NUM>, the following steps are implemented:.

Optionally, when the computer program <NUM> is executed by the processor <NUM>, the following steps may be further implemented:.

The first communication device <NUM> can implement the processes implemented by the first communication device in the foregoing method embodiments. To avoid repetition, details are not described herein again.

An embodiment not covered by the claims of this disclosure further provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium. When the computer program is executed by a processor, processes of the foregoing transmission method embodiment can be implemented, with the same technical effects achieved. To avoid repetition, details are not described herein again. For example, the computer-readable storage medium is a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk, an optical disc, or the like.

It should be noted that in this specification, the terms "include" and "comprise", or any of their variants are intended to cover a non-exclusive inclusion, such that a process, a method, an article, or an apparatus that includes a list of elements not only includes those elements but also includes other elements that are not expressly listed, or further includes elements inherent to such a process, method, article, or apparatus. In absence of more constraints, an element preceded by "includes a. " does not preclude the existence of other identical elements in the process, method, article, or apparatus that includes the element.

According to the foregoing description of the implementations, a person skilled in the art may clearly understand that the methods in the foregoing embodiments may be implemented by using software in combination with a necessary common hardware platform, and certainly may alternatively be implemented by using hardware. However, in most cases, the former is an example implementation. Based on such an understanding, the technical solutions of this disclosure essentially or a part thereof that contributes to related technologies may be embodied in a form of a software product. The computer software product is stored in a storage medium (for example, a ROM/RAM, a magnetic disk, or an optical disc), and includes several instructions for instructing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, a network device, or the like) to perform the methods described in the embodiments of this disclosure.

A person of ordinary skill in the art may be aware that the units and algorithm steps in the examples described with reference to the embodiments disclosed in this specification can be implemented by electronic hardware or a combination of computer software and electronic hardware.

It may be clearly understood by a person skilled in the art that, for the purpose of convenient and brief description, for a detailed working process of the foregoing system, apparatus, and unit, reference may be made to a corresponding process in the foregoing method embodiments, and details are not described again herein.

In the embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the described apparatus embodiments are merely examples. For example, a plurality of units or components may be combined or integrated into another system, or some elements may be ignored or may not be performed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections may be indirect couplings or communication connections through some interfaces, apparatuses or units, and may be implemented in electrical, mechanical, or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, and may be located in one position or distributed on a plurality of network elements.

When the functions are implemented in a form of a software functional unit and sold or used as a separate product, the functions may be stored in a computer-readable storage medium. Based on such an understanding, the technical solutions of this disclosure essentially, or the part contributing to related technologies, or some of the technical solutions may be embodied in a form of a software product. The computer software product is stored in a storage medium, and includes instructions for enabling a computer device (which may be a personal computer, a server, a network device, or the like) to perform all or some of the steps of the methods described in the embodiments of this disclosure. The foregoing storage medium includes: any medium that can store program code, such as a USB flash drive, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disc.

A person of ordinary skill in the art may understand that all or some of the processes of the methods in the embodiments may be implemented by a computer program controlling relevant hardware. The program may be stored in a computer-readable storage medium. When the program runs, the processes of the methods in the embodiments are performed. The foregoing storage medium may be a magnetic disk, an optical disc, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), or the like.

It can be understood that the embodiments described in the embodiments of this disclosure may be implemented by hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit may be implemented in one or more application-specific integrated circuits (Application Specific Integrated Circuit, ASIC), digital signal processors (Digital Signal Processor, DSP), digital signal processing devices (DSP Device, DSPD), programmable logic devices (Programmable Logic Device, PLD), field-programmable gate arrays (Field-Programmable Gate Array, FPGA), general-purpose processors, controllers, microcontrollers, microprocessors, and other electronic units for performing the functions described in this disclosure, or a combination thereof.

For software implementation, the techniques described in the embodiments of this disclosure may be implemented by modules (for example, procedures or functions) that perform the functions described in the embodiments of this disclosure. Software code may be stored in the memory and executed by the processor. The memory may be implemented in or outside the processor.

Claim 1:
A transmission method, applied to a first communication device, characterized by comprising:
transmitting (<NUM>) a target reference signal that belongs to a first type of reference signal in a case that indication information from a second communication device is received and indicates transmission of the first type of reference signal, wherein,
a reference signal sequence of the first type of reference signal is generated based on a first characteristic, wherein
in a case that the first type of reference signal occupies <NUM> subcarriers, the reference signal sequence comprises at least one of the following sequences:
<NUM>,
<NUM>,
<NUM>;
in a case that the first type of reference signal occupies <NUM> subcarriers, the reference signal sequence comprises at least one of the following sequences:
<NUM>,
<NUM>,
<NUM>; and,
in a case that the first type of reference signal occupies <NUM> subcarriers, the reference signal sequence comprises at least one of the following sequences:
<NUM>,
<NUM>,
<NUM>,
<NUM>,
wherein the first characteristic comprises at least one of the following:
that an auto-correlation shift mean of a first reference signal symbol of the target reference signal falls within [<NUM>, <NUM>];
that cross-correlation values of first reference signal symbols of all reference signals in a reference signal group corresponding to the first type of reference signal fall within [<NUM>, <NUM>];
that a peak-to-average power ratio, PAPR, value of reference signal symbols of the target reference signal falls within [<NUM> dB, <NUM> dB];
that a minimum value of a modulus of a second reference signal symbol of the target reference signal is greater than <NUM>; and
that a difference between a signal-to-interference-plus-noise ratio, SINR, value corresponding to a first value of a block error rate, BLER, of the target reference signal, and a mean value of SINR values corresponding to first values of BLERs of all reference signals in a reference signal group corresponding to the first type of reference signal falls within [-<NUM> dB, <NUM> dB].