CN110677226B

CN110677226B - Reference signal sending and receiving method and communication equipment

Info

Publication number: CN110677226B
Application number: CN201810715923.3A
Authority: CN
Inventors: 柯颋; 夏亮; 钟科; 刘光毅; 杨光
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2018-07-03
Filing date: 2018-07-03
Publication date: 2022-05-10
Anticipated expiration: 2038-07-03
Also published as: CN110677226A

Abstract

The invention provides a reference signal sending and receiving method and communication equipment, and belongs to the technical field of wireless communication. The reference signal sending method applied to the first communication equipment comprises the following steps: generating a reference signal transmitted on each antenna port according to a reference signal basic sequence to be transmitted, a subcarrier spacing SCS of first communication equipment and a reference subcarrier spacing of the reference signal; and transmitting the generated reference signal to the second communication device. The technical scheme of the invention can keep the time domain waveforms of the reference signals sent by different numerology base stations consistent, and can reduce the processing complexity required by the receiving end to detect the reference signals at the receiving end.

Description

Reference signal sending and receiving method and communication equipment

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a method for transmitting and receiving a reference signal and a communication device.

Background

The 5G NR (New Radio, New air interface) system may use two Frequency band usage modes, namely TDD (Time Division duplex) and FDD (Frequency Division duplex). When the 5G NR base station adopts the TDD operation mode, the 5G NR base station may suffer from interference from the remote base station, i.e. DL signals of the remote base station may cause strong interference to UL data reception of the local base station. Therefore, 5GNR networks need to address the remote base station interference problem.

For different application scenarios, the 5G NR system designs multiple parameter configurations (numerology) at the same time, and SCS (subcarrier spacing) of different numerology is different, and corresponding Cyclic Prefix (CP) lengths are also different. Generally speaking, the larger the subcarrier interval, the shorter the time domain length of the OFDM symbol, and the shorter the corresponding CP length, the smaller the tolerable multipath delay spread range.

Far-end interference issues are considered. Since the 5G NR system allows multiple numerologies to exist in the network at the same time, the numerology of the dedicated interference detection reference signal transmitted by the victim base station may be different from the numerology of the aggressor base station. For example, when the offending base station employs a 30kHz subcarrier spacing, the subcarrier spacing of the dedicated interference detection reference signal it listens to may be 15kHz, 30kHz, or 60 kHz.

How the local bs detects reference signals with different numerologies from other bss has not been an effective solution at present.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a method and a communication device for transmitting and receiving a reference signal, wherein at a transmitting end, time domain waveforms of reference signals transmitted by different number base stations can be kept consistent, and at a receiving end, processing complexity required when the receiving end detects the reference signal can be reduced.

To solve the above technical problem, embodiments of the present invention provide the following technical solutions:

in one aspect, a method for sending a reference signal is provided, where the method is applied to a first communication device, and the method includes:

generating a reference signal transmitted on each antenna port according to a reference signal basic sequence to be transmitted, a subcarrier spacing SCS of first communication equipment and a reference subcarrier spacing of the reference signal;

sending the generated reference signal to the second communication device, so that after the second communication device detects the reference signal, the second communication device combines an amplitude scaling factor based on the detected received power of the reference signal

And calculating the interference situation of the corresponding reference signal transmitting base station to the base station when the corresponding reference signal transmitting base station normally transmits DL data.

Further, the air conditioner is provided with a fan,

when the reference SCS of the reference signal is greater than or equal to the SCS of the first communication device, generating the reference signal according to the following formula:

wherein p denotes an antenna port number for transmitting the reference signal,

represents the transmitted signal on the k sub-carrier of the p antenna port,

represents a frequency domain start position of the reference signal,

a base sequence, M, representing the reference signal transmitted on the p-th antenna port_RSRepresents the length of the base sequence of the reference signal,

represents a first predetermined parameter, k' is an integer and ranges from 0 to Q M_RS-1；

The comb tooth spacing Q is determined according to at least one of the following formulas:

Q＝SCS_referenceRS/SCS_TRP，SCS_TRPSCS, SCS representing the first communication device_referenceRSReference SCS representing a reference signal, wherein,

the value is greater than or equal to zero; or the like, or, alternatively,

wherein the content of the first and second substances,

is the system configuration parameter of the reference signal, mu is the system configuration parameter of the first communication device, and the reference subcarrier spacing of the reference signal

Subcarrier spacing SCS for a first communication device_TRP＝2^μ。

Further, the amplitude scaling factor

Is arranged as

Further, the air conditioner is provided with a fan,

when the reference SCS of the reference signal is less than or equal to the SCS of the first communication device, generating the reference signal according to the following formula:

wherein p denotes an antenna port number for transmitting the reference signal,

represents the transmitted signal on the k sub-carrier of the p antenna port,

represents a frequency domain start position of the reference signal,

denotes a first preset parameter, set Q1, wherein,

the value is greater than or equal to zero.

Further, the air conditioner is provided with a fan,

the first preset parameter

Is the reference transmitted on the p-th antenna portA ratio of energy per resource element EPRE for non-zero elements of the signal to EPRE for non-zero elements of the PDSCH.

Further, the air conditioner is provided with a fan,

the first preset parameter

Is equal to the ratio of the reference SCS of the reference signal to the SCS of the first communication device.

Further, the air conditioner is provided with a fan,

at least one of the following parameters is determined by at least one indication method of preset, operation, administration and maintenance (OAM) configuration and backhaul signaling indication of a backhaul line between base stations:

transmitting an antenna port number p of the reference signal;

the base sequence of the reference signal transmitted on the p-th antenna port

Reference SCS configuration SCS for the reference signal_referenceRS；

The first preset parameter

Frequency domain starting position of the reference signal

Further, the air conditioner is provided with a fan,

the reference signal is periodically sent in a time domain, and at least one of the following parameters is determined through at least one indication method of presetting, OAM configuration and backhaul signaling indication between base stations:

a time domain transmission period of the reference signal;

the time domain starting sending time of the reference signal in the time domain sending period;

a duration of the reference signal within the time domain transmission period.

Further, the air conditioner is provided with a fan,

the reference signal is repeatedly sent according to preset times in a time domain, and at least one of the following parameters is determined through at least one indication method of presetting, OAM configuration and backhaul signaling indication between base stations:

the time domain of the reference signal starts to send time;

a single duration of the reference signal;

the number of times of repeated transmission of the reference signal;

the time domain interval of the reference signal between adjacent 2 transmissions.

Further, the air conditioner is provided with a fan,

the time unit is indicated according to at least one of the following methods:

an absolute time length;

the number of OFDM symbols OS determined according to the reference SCS of the reference signal;

an OS symbol number determined according to SCS of the first communication device;

the number of OS symbols determined by the SCS of the second communication device.

The embodiment of the invention also provides a reference signal sending method, which is applied to the first communication equipment and comprises the following steps:

generating a reference signal having cyclic shift characteristics in a time domain with a minimum cyclic shift period of 1/SCS_referenceRSWherein, SCS_referenceRSA reference SCS representing a reference signal;

and transmitting the generated reference signal to the second communication device.

Further, the air conditioner is provided with a fan,

the reference signal cyclic shift period is 1/SCS when the reference SCS of the reference signal is greater than or equal to the SCS of the first communication device_TRPWherein, SCS_TRPA subcarrier spacing, SCS, representative of the first communication device.

Further, the air conditioner is provided with a fan,

when the reference SCS of the reference signal is greater than or equal to the first passAt SCS of the signal device, the reference signal is at slave I₁To l₂Continuous l₂-l₁OFDM baseband signal generated in time interval composed of +1 OFDM symbols OS

Has the following characteristics:

wherein the content of the first and second substances,

represents from l₁To l₂Continuous l₂-l₁+1 OS duration.

Further, the air conditioner is provided with a fan,

when the reference SCS of the reference signal is greater than or equal to the SCS of the first communication device, the reference signal is at the second SCS₁To l₂Continuous l₂-l₁The OFDM baseband signal generated in the time interval consisting of +1 OS is

Wherein the content of the first and second substances,

representing the transmitted signal on the k sub-carrier of the p antenna port,

represents the frequency domain starting position, M, of the reference signal_RSRepresents the length of the base sequence of the reference signal,

SCS_referenceRSreference SCS configuration representing a reference signal, N_RBWhich indicates the number of resource blocks RB,

denotes the number of subcarriers within each RB, a^～Is a full frequency domain bandwidth signal.

Further, the air conditioner is provided with a fan,

when the reference SCS of the reference signal is less than or equal to the SCS of the first communication device, the reference signal is at the secondary l₁To l₂Continuous l₂-l₁The OFDM baseband signal generated in the time interval consisting of +1 OS is

Wherein the content of the first and second substances,

representing the transmitted signal on the k sub-carrier of the p antenna port,

representing the frequency domain starting position, M, of the reference signal_RSRepresenting the length of the basic sequence of the reference signal, setting Q to 1, SCS_referenceRSRepresenting a reference SCS configuration of the reference signal.

Further, the air conditioner is provided with a fan,

the first communication device is at slave I₁To l₂Continuous l₂-l₁The total OFDM baseband signal generated in the time interval consisting of +1 OS is

Wherein the content of the first and second substances,

is at the slave l₁To l₂Continuous l₂-l₁A total OFDM baseband signal generated by the first communication device during a time interval of +1 OS;

is at the slave l₁To l₂Continuous l₂-l₁An OFDM baseband signal generated by the reference signal in a time interval composed of +1 OSs;

is in a slave I₁To l₂Continuous l₂-l₁An OFDM baseband signal generated from other signals except the reference signal in a time interval consisting of +1 OSs;

and is

Wherein the content of the first and second substances,

represents an OFDM baseband signal generated from signals other than the reference signal on the ith OS, and

wherein the content of the first and second substances,

a frequency domain signal representing other signals than the reference signal on a (k, l) th resource element resource grid on a p-th antenna port, the

The following characteristics are required:

if it is not

Further, the air conditioner is characterized in that,

transmitting an antenna port number p of the reference signal;

the base sequence of the reference signal transmitted on the p-th antenna port

Reference SCS configuration SCS for the reference signal_referenceRS；

Frequency domain starting position of the reference signal

Further, the air conditioner is provided with a fan,

a time domain transmission period of the reference signal;

a duration of the reference signal within the time domain transmission period.

Further, the air conditioner is provided with a fan,

the time domain of the reference signal starts to send time;

a single duration of the reference signal;

the number of times of repeated transmission of the reference signal;

Further, the air conditioner is provided with a fan,

the time unit is indicated according to at least one of the following methods:

an absolute time length;

The embodiment of the invention also provides a reference signal receiving method which is applied to second communication equipment and comprises the following steps:

receiving a reference signal transmitted by a first communication device on a frequency domain;

and obtaining a basic sequence of the reference signal according to the received reference signal.

Further, the air conditioner is provided with a fan,

when the reference SCS of the reference signal is greater than or equal to the SCS of the second communication device, the reference signal is received

Obtaining a base sequence of the reference signal

The method comprises the following steps:

wherein, p isAn antenna port number used for transmitting the reference signal,

representing the received signal of the second communication device on the k sub-carrier of the p antenna port,

represents a frequency domain starting position of the reference signal,

representing the basic sequence of said reference signal at the p-th antenna port, M_RSRepresents the length of the base sequence of the reference signal,

SCS_TRPSCS, SCS representing the second communication device_referenceRSRepresenting a reference SCS configuration of the reference signal.

Further, the air conditioner is provided with a fan,

when the reference SCS of the reference signal is less than or equal to the SCS of the second communication device, the reference signal is received

Obtaining a base sequence of the reference signal

The method comprises the following steps:

wherein p denotes an antenna port number for transmitting the reference signal,

represents a frequency domain starting position of the reference signal,

representing the basic sequence of said reference signal at the p-th antenna port, M_RSDenotes the length of the base sequence of the reference signal, and Q is 1.

Further, the air conditioner is provided with a fan,

transmitting an antenna port number p of the reference signal;

reference SCS configuration SCS for the reference signal_referenceRS；

Frequency domain starting position of the reference signal

The base sequence of the reference signal transmitted on the p-th antenna port

A first preset parameter of the reference signal sent on the p-th antenna port

Embodiments of the present invention also provide a first communication device, including a processor and a transceiver,

the processor is used for generating a reference signal transmitted on each antenna port according to a reference signal basic sequence to be transmitted, a subcarrier spacing SCS of the first communication device and a reference subcarrier spacing of the reference signal;

the transceiver is configured to transmit the generated reference signal to a second communication device.

Further, the air conditioner is provided with a fan,

the processor is specifically configured to generate the reference signal when a reference SCS of the reference signal is greater than or equal to an SCS of the first communication device, according to the following equation:

wherein p denotes an antenna port number for transmitting the reference signal,

represents the transmitted signal on the k sub-carrier of the p antenna port,

represents a frequency domain start position of the reference signal,

represents a first preset parameter, k' is an integer and ranges from 0 to Q M_RS-1；

the value is greater than or equal to zero; or the like, or, alternatively,

wherein the content of the first and second substances,

Subcarrier spacing SCS for a first communication device_TRP＝2^μ。

Further, the amplitude scaling factor

Is arranged as

Further, the air conditioner is provided with a fan,

the processor is specifically configured to generate the reference signal when a reference SCS of the reference signal is less than or equal to an SCS of the first communication device, according to the following equation:

wherein p denotes an antenna port number for transmitting the reference signal,

represents the transmitted signal on the k sub-carrier of the p antenna port,

a frequency domain start bit representing the reference signal

The device is placed in a water tank,

denotes a first preset parameter, setting Q to 1, wherein,

the value is greater than or equal to zero.

the processor is used for generating a reference signal, the reference signal has a cyclic shift characteristic in a time domain, and a minimum cyclic shift period is 1/SCS_referenceRSWherein, SCS_referenceRSA reference SCS representing a reference signal;

Further, the air conditioner is provided with a fan,

when the reference SCS of the reference signal is greater than or equal to the SCS of the first communication device, the reference signal is at the secondary l₁To l₂Continuous l₂-l₁OFDM baseband signal generated in time interval composed of +1 OFDM symbols OS

Has the following characteristics:

wherein the content of the first and second substances,

represents from l₁To l₂Continuous l₂-l₁+1The duration of each OS.

Further, the air conditioner is provided with a fan,

when the reference SCS of the reference signal is greater than or equal to the SCS of the first communication device, the reference signal is at the secondary l₁To l₂Continuous l₂-l₁The OFDM baseband signal generated in the time interval consisting of +1 OS is

Wherein the content of the first and second substances,

representing the transmitted signal on the k sub-carrier of the p antenna port,

representing the frequency domain starting position, M, of the reference signal_RSRepresents the length of the base sequence of the reference signal,

Further, the air conditioner is provided with a fan,

Wherein, the first and the second end of the pipe are connected with each other,

representing the transmitted signal on the k sub-carrier of the p antenna port,

representing the frequency domain starting position, M, of the reference signal_RSRepresenting the length of the base sequence of the reference signal, setting Q to 1, SCS_referenceRSRepresenting a reference SCS configuration of the reference signal.

Further, the air conditioner is provided with a fan,

the processor is in slave I₁To l₂Continuous l₂-l₁The total OFDM baseband signal generated in the time interval consisting of +1 OS is

Wherein the content of the first and second substances,

is at the beginning ofl₁To l₂Continuous l₂-l₁An OFDM baseband signal generated from other signals except the reference signal in a time interval consisting of +1 OSs;

and is provided with

Wherein the content of the first and second substances,

represents an OFDM baseband signal generated by other signals except the reference signal on the l-th OS, and

wherein the content of the first and second substances,

The following characteristics are required:

if it is not

The embodiment of the invention also provides a second communication device, which comprises a processor and a transceiver,

the transceiver is used for receiving a reference signal transmitted by a first communication device on a frequency domain;

the processor is configured to obtain a base sequence of the reference signal according to the received reference signal.

Further, the air conditioner is provided with a fan,

the processor is configured to receive a reference signal from a second communication device when a reference SCS of the reference signal is greater than or equal to an SCS of the second communication device

Obtaining a base sequence of the reference signal

The method comprises the following steps:

wherein p denotes an antenna port number for transmitting the reference signal,

represents a frequency domain starting position of the reference signal,

representing the basic sequence of the reference signal on the p-th antenna port, M_RSRepresents the length of the base sequence of the reference signal,

The embodiment of the invention also provides communication equipment, which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor; the processor implements the reference signal transmitting method as described above or implements the reference signal receiving method as described above when executing the program.

An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is configured to, when executed by a processor, implement the steps in the reference signal transmitting method or implement the steps in the reference signal receiving method.

The embodiment of the invention has the following beneficial effects:

in the above scheme, the communication device at the transmitting end, by designing different reference signal frequency domain structures for different numerology base stations, allows the 5G NR base station to be able to transmit the dedicated reference signal based on its numerology, and may make the time domain waveforms of the dedicated reference signals transmitted by the different numerology base stations consistent; at the receiving end, multiplexing of UL frequency domain received data (i.e. UL received data after FFT) is allowed, and the frequency domain sequence of the dedicated reference signal can be correctly restored through simple frequency domain processing, so as to reduce the processing complexity required when the receiving end detects the dedicated reference signal.

Drawings

FIG. 1a is a schematic diagram of a network topology;

FIG. 1b is a schematic diagram of interference characteristics;

fig. 2 is a schematic diagram of a remote interference management mechanism based on a centralized manager;

FIG. 3 is a schematic diagram of time-domain receiving and transmitting positions of a third reference signal;

FIG. 4 is a schematic diagram of spatial propagation characteristics of a third reference signal;

FIG. 5a is a diagram illustrating a third reference signal transmission process;

fig. 5b is a schematic structural diagram of a third reference signal CP;

FIG. 5c is a diagram illustrating a third reference signal receiving process;

FIG. 6 is a diagram illustrating the energy peak distribution characteristics of the IFFT output result x (n);

FIG. 7 is a schematic diagram of the time domain relationship of signals corresponding to subcarrier spacings of 15kHz, 30kHz and 60 kHz;

fig. 8 and 9 are flow charts of a reference signal transmission method applied to a first communication device according to an embodiment of the present invention;

fig. 10 is a flowchart illustrating a reference signal receiving method applied to a second communication device according to an embodiment of the present invention;

fig. 11 is a block diagram of a first communication device according to an embodiment of the present invention;

FIG. 12 is a block diagram of a second communication device according to an embodiment of the present invention

13 a-13 c are schematic diagrams of frequency domain characteristics of reference signals according to embodiments of the present invention;

fig. 14 is a schematic diagram of time domain characteristics of a reference signal according to an embodiment of the invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

In a TDD system (including at least a TD-LTE (Time Division Long Term Evolution) system and an NR (New Radio, New air interface) system), because upLink and downlink have the same frequency, if there is still strong reception power when DL (downlink) signals of other base stations reach a UL (upLink) signal reception window of a local base station through spatial propagation, DL signals of other base stations will cause strong interference to UL data reception of the local base station, that is, there is strong cross-link interference. The interfering base station may be from a near-end neighboring base station of the local base station or from a far-end base station. As shown in fig. 1a, which is a network topology diagram, it can be seen that eNB (Evolved Node B) 3 does not interfere eNB1 when DL signal propagation attenuation is large, and eNB2 does not interfere eNB1 when DL signal falls in GP (guard period). Fig. 1b is a schematic diagram of interference characteristics.

When all base stations in the TDD network adopt the same frame structure configuration and maintain time-frequency synchronization, the problem of cross-link interference is generally not serious.

As shown in FIGS. 1a and 1b, consider the cross-link interference scenario of a near neighbor base station eNB2 and a far neighbor base station eNB3 with a local base station eNB 1.

Consider first the cross link interference problem of a near end neighbor base station to a local base station (i.e., eNB2DL interferes with eNB1 UL). When an operator deploys a TDD network, it is ensured that an uplink-downlink transition GP is larger than an ISD (inter site distance), so that DL signals of near-end neighboring base stations fall within the GP of a local base station after spatial propagation, and therefore the DL signals of the near-end neighboring base stations generally do not cause interference to UL data reception of the local base station.

Consider again the cross-link interference problem of the remote base station to the local base station (i.e., eNB3DL interferes with eNB1 UL). Although the DL signal of the remote base station (e.g. eNB3) may fall within the UL signal reception window of the local base station (e.g. eNB1) after propagating through the space, since the signal reception power is rapidly attenuated with the increase of the distance traveled in the normal climate environment, the DL signal of the remote base station falling within the UL signal reception window of the local base station is usually very weak, and the interference energy thereof is generally negligible, so the DL signal of the remote base station generally does not cause interference to the UL data reception of the local base station.

However, in some special weather environments (such as the atmospheric air waveguide), the DL signal of the remote base station may cause strong interference to the UL data reception of the local base station. The atmospheric waveguide is a phenomenon that electric wave forms super-refraction propagation in a troposphere due to the fact that a layer with inverse temperature or water vapor sharply reduced along with height exists in the troposphere, and most of electric wave radiation is limited to propagate in the layer. When the atmospheric wave guide occurs, the DL signal of the remote base station still has high energy after being transmitted over an ultra-long distance of tens or hundreds of kilometers. Due to the long distance, the DL signal of the remote base station will fall within the UL signal receiving window of the local base station after being spatially propagated; and due to the atmospheric waveguide phenomenon, the signal power of the DL signal of the far-end base station is strong after the DL signal is remotely transmitted, so that when the atmospheric waveguide phenomenon exists, the DL signal of the far-end base station can cause strong interference to the UL data reception of the local base station.

In the existing TD-LTE network, it is found that TD-LTE in many provinces such as Jiangsu, Anhui, Hainan and Henan is disturbed in a large area, the ascending IOT can reach 25dB, and KPI (Key Performance Indicator) indexes such as RRC (Radio Resource Control) connection establishment success rate and the like are seriously degraded. The interfered cell mainly takes rural F frequency bands, and the interference time is mainly concentrated at 0:00-8: 00; the interference is easy to occur in spring and autumn, and the affected base stations are hundreds to tens of thousands of times.

The general idea for dealing with the problem of far-end base station interference is as follows:

step 1, positioning an interference base station (namely an interference source);

and Step 2, performing interference back-off operation on the positioned interference base station, such as reducing the downlink time slot of the interference base station, so as to reduce the interference of the DL signal of the interference base station on the UL data reception of other base stations.

In order to locate interfering base stations, an intuitive solution is: the interfering base stations are allowed to transmit dedicated interference detection reference signals (denoted as first reference signals) that can distinguish different base stations. In this way, the interfered base station can judge who is the interference source of the interfered base station by detecting the first reference signal transmitted by the interfered base station.

However, it should be noted that the first reference signal is only used for discovering a far-end interference phenomenon between base stations, and therefore, for normal data transmission of the receiving and transmitting base stations, the first reference signal is a useless signal and belongs to network signaling overhead.

Considering that the far-end interference phenomenon is usually caused by the atmospheric waveguide phenomenon, which is not always generated, the design scheme is inefficient for the whole network in order to suppress the accidental far-end interference problem and make the network consume a large amount of resources to regularly receive and transmit the dedicated reference signal.

In view of the above problem, another technical scheme is adopted in the existing network transit, that is, after determining that the interfered base station is affected by the potential far-end interference, a dedicated interference detection reference signal (denoted as a second reference signal) capable of distinguishing different base stations is sent. Thus, the transmission of the second reference signal is conditional, i.e. the second reference signal is transmitted only if the victim base station guesses itself to be affected by the far-end interference. Since the frequent transmission behavior is changed to the triggered transmission behavior, the scheme is expected to significantly reduce the network resource overhead required for transmitting the second reference signal when the far-end interference phenomenon does not occur frequently.

Note that the underlying premise assumption that the above scheme can work is: the channels of the interfered base station and the interfered base station have reciprocity. That is, when the interfered base station and the interfering base station adopt the same frame structure, the channel attenuation characteristics from the interfering base station to the interfered base station and the channel attenuation characteristics from the interfering base station to the interfering base station are consistent, so that the interfering base station can also detect when the interfered base station transmits the second reference signal.

In summary, the above scheme is characterized in that: and the interfered base station sends a second reference signal, and the interfering base station detects the second reference signal so as to judge who the interference potential interferes. The interfering base station may further perform an interference backoff operation, such as reducing the downlink timeslot of the interfering base station to reduce the interference of its DL signal to the UL data reception of other base stations.

Fig. 2 is a diagram illustrating a remote interference management mechanism based on a centralized manager, wherein the centralized manager is referred to as a wide-area SON. The core flow comprises the following steps:

the interfered base station (marked as a base station V) guesses the far-end interference → the interfered base station sends a special detection reference signal → the interference base station (marked as a base station A) listens for the special detection reference signal and judges whether the interfered base station is an interference source → the interference station executes the interference back-off operation.

Note that fig. 2 does not represent the only implementation. The above core flow can also work when there is no centralized manager in the network. Only when the centralized manager is adopted, the working efficiency of the core process can be improved.

A structure of a reference signal (denoted as a third reference signal) dedicated to detecting interference of a remote base station in an LTE network is shown in fig. 3, where fig. 3 is a schematic diagram of a time domain receiving and transmitting position of the third reference signal. When the TD-LTE network employs the 9:3:2 special subframe configuration, the victim base station chooses to transmit the third reference signal in the last 2 OSs (corresponding to OS #7- # 8) in the DwPTS of subframe 1.

The interfering base station listens for the third reference signal on the UpPTS in each radio frame and on 16 OSs in subframe 2 (corresponding to OSs #12- #13 in special subframes, plus all OSs in subframe 2).

Fig. 4 is a schematic diagram of spatial propagation characteristics of a third reference signal. As shown in fig. 4, after long distance propagation, the third reference signal received by the interfering base station is generally not aligned with the start boundary of the local OFDM symbol (abbreviated as OS: OFDM symbol).

Fig. 5a shows a third reference signal transmission process, fig. 5b shows a third reference signal CP structure, and fig. 5c shows a third reference signal reception process. It can be seen that the main reception processing module comprises: (time domain reception signal) → FFT → (frequency domain reception signal) → conjugate multiplication with the local frequency domain reproduction signal → IFFT → (time domain correlation peak) → correlation peak detection. Obviously, the complexity of the third reference signal receiving process mainly comes from: FFT and IFFT operations.

Considering that the first operation of normal UL data reception also includes FFT processing, in order to reduce the complexity of the third reference signal reception processing, an optimized processing scheme is: the FFT operation of the multiplexed normal UL data reception, i.e. all other modules in fig. 5c except the FFT processing module, are dedicated modules specifically designed for receiving the third reference signal.

Note that the time domain length of the UL OS is FFT point number + CP point number. In order to be able to multiplex the FFT operation of normal UL data reception, it is necessary to include a complete circularly shifted version of the time domain FFT signal of the third reference signal signature sequence within the reception time window consisting of the number of FFT points that disturb the UL OS of the base station. Therefore, in order to solve the problem of signal boundary misalignment caused by the spatial propagation characteristic shown in fig. 4, it is necessary that the time domain sequence of the third reference signal maintains phase continuity on two adjacent symbols.

For this purpose, the prior art adopts the structure of the third reference signal CP shown in fig. 5b, i.e. the third reference signal adopts 2 adjacent OSs, and the CP positions of the 2 symbols are different, wherein the CP of the 1 st OS is placed at the front and the CP on the 2 nd OS is placed at the back. The time domain sequence of the third reference signal maintains phase continuity on two adjacent symbols, that is, a time receiving window with the length of the FFT point is intercepted from any time in the middle of the third reference signal, so that a complete cyclic shifted version of the time domain FFT signal of the third reference signal feature sequence can be obtained.

Fig. 5c further shows the mathematical principle of the third reference signal receiving process. This will be briefly described below.

The frequency domain sequence of the third reference signal is not recorded as S (k), k is 0 ≦ N_FFT-1, wherein N_FFTRepresenting the number of FFT points. Then the time domain variation sequence s (N), 0 ≦ N ≦ N_FFT-1 writing:

modeling multipath channel h (t) as

Wherein, γ_iRepresenting the power attenuation coefficient, tau, over the ith multipath_iRepresents the delay on the ith multipath, and δ (·) is the dirac delta function.

The time domain received signal of the disturbed base station can be represented as

Where denotes convolution operation and P denotes the product of signal transmit power, transmit and receive antenna pattern gain, transmit and receive antenna beamforming gain, etc.

The disturbed base station samples the received signal r (t) in a time domain receiving window with the length of FFT point, and FFT transforms the sampling point. In view of the following transformation relationship,

note the book

Then the frequency domain signal R (k) after FFT transform can be processed, k is more than or equal to 0 and less than or equal to N_FFT-1 is represented by:

wherein f is₀Indicating the subcarrier spacing of the offending base station.

The scrambling base station locally reproduces the frequency domain sequence S (k) of the third reference signal and multiplies the frequency domain sequence S (k) with the conjugate point of the frequency domain receiving signal to obtain a frequency domain product signal X (k) which is:

note that the frequency domain signal X (k) is a frequency domain transform of the multipath signal, in the form of frequency domain selective fading, so the set { X (k) }is simply set_kCannot output a valuable result by accumulating all the elements in (a). In order to detect whether the third reference signal exists, an IFFT operation is further performed on x (k), and the output result x (n) is an impulse function of the multipath signal, that is:

obviously, if the received signal of the interfering base station includes the third reference signal, after the receiving process shown in fig. 5, the IFFT output result x (n) includes the impulse function of the multipath signal, so that it can be determined whether the third reference signal exists through the energy peak search operation, and the received signal energy P | γ of at least one multipath propagation path is obtained_i|²And propagation delay τ_iAnd (4) information.

Fig. 6 is a schematic diagram of the energy peak distribution characteristics of the IFFT output result x (n). As shown in FIG. 6, the x (n) sequence may exhibit a plurality of energy peaks, where each energy peak corresponds to a multipathAnd (4) information. It is not assumed that the ith energy peak is in the sequence { x (n) }_nIs as a time domain position of

The peak value of energy is P | gamma_i|²Then, it represents the propagation delay of the corresponding multi-path signal

Where f (-) represents some deterministic function; the received power of the multipath signal is P | gamma_i|²。

Similar to the 4G LTE system, the 5G NR system may also use TDD and FDD frequency bands. When the 5G NR base station also adopts TDD operation, the 5G NR base station may also suffer from interference from the remote base station, i.e. the DL signal of the remote base station may cause strong interference to the UL data reception of the local base station. Therefore, 5G NR networks also need to address the far end base station interference problem.

Unlike the 4G LTE system, the 5G NR system simultaneously designs various parameter configurations (numerology) for different application scenarios, and SCS (subcarrier spacing) of different numerology is different, and the corresponding CP (cyclic prefix) length is also different. Generally speaking, the larger the subcarrier spacing, the shorter the time domain length of the OFDM symbol, and the shorter the corresponding CP length, the smaller the tolerable multipath delay spread.

Fig. 7 shows a schematic diagram of the time domain relationship of signals corresponding to subcarrier intervals of 15kHz, 30kHz and 60kHz in sequence from top to bottom.

The 5G NR guarantees OS boundary alignment for different numerologies by system design. As shown in FIG. 7, each 15kHz OS consists of 2 30kHzOS and 4 60kHz OS, with the three OS boundaries aligned.

Note that the CP of the first OS per slot (ms) is longer in the LTE system, and in order to keep the CP structure of 15kHz numerology in the 5G NR system consistent with the LTE system, the 5G NR is designed by the system such that the first OS length every 0.5ms is also longer than the CP of the other OS for all numerology.

Further, the 5G NR system allows multiple numerologies to exist in the network at the same time. For example, for general urban coverage, a 5G base station may employ a 30kHz subcarrier spacing to tolerate a larger multipath delay spread; for high-speed rail line-along base stations, it is possible to use 60kHz subcarrier spacing to support greater terminal movement speeds. Then there will be a co-existence of 30kHz and 60kHz subcarrier spacing in a 5G NR network.

An intuitive solution is: all base stations in the network agree on the same numerology for the reference signals dedicated for inter-base station communication. All base stations in the network transmit and receive the dedicated reference signals according to the same numerology, which may be different from the numerology used for normal data reception of the local base station.

Note that the sampling rate of the received signal on the base station side is determined by the received signal bandwidth. For example, in an LTE system, when the system bandwidth (i.e., the maximum signal bandwidth) is 20MHz, the sampling rate used by the base station is 30.72 MHz.

Numerology variations do not affect the sampling rate, only the number of points of the FFT transform. It is not assumed that the system bandwidth is maintained at 20 MHz.

When 15kHz SCS is used, the corresponding OFDM symbol length(s) is 1/15kHz,

namely, SCS at 15kHz corresponds to FFT operation at 2048 points;

similarly, when the SCS of 30kHz is adopted, the corresponding OFDM symbol length(s) is 1/30kHz,

namely, the SCS of 30kHz corresponds to the FFT operation of 1024 points;

similarly, when the SCS of 60kHz is adopted, the corresponding OFDM symbol length(s) is 1/60kHz,

i.e., SCS at 60kHz corresponds to 512-point FFT operation.

As shown in fig. 5, the reception of the dedicated reference signal may at least include two operations of FFT and IFFT. If the numerology of the dedicated reference signal is different from the numerology used for normal data reception of the local bs, in the flow shown in fig. 5, the same set of FFT circuit output results cannot be used for both UL data reception and dedicated reference signal detection because different numerologies correspond to different FFT transform point numbers. In this case, in the base station side receiver, a new FFT algorithm module needs to be specially designed for numerology of the dedicated reference signal, or an FFT module needs to be used in time sharing with data. In summary, the above-described intuitive solution of designing a dedicated receiving circuit for dedicated reference signals with agreed numerology would significantly increase receiver algorithm complexity compared to the reference signal detection procedure based on UL frequency domain received data multiplexing shown in fig. 5.

Embodiments of the present invention provide a method and a communication device for transmitting and receiving a reference signal, so that at a transmitting end, time domain waveforms of reference signals transmitted by different numerology base stations may be kept consistent, and at a receiving end, a processing complexity required when a receiving end detects the reference signal may be reduced.

An embodiment of the present invention provides a reference signal sending method, which is applied to a first communication device, and as shown in fig. 8, the method includes:

step 101: generating a reference signal transmitted on each antenna port according to a basic sequence of the reference signal to be transmitted, a subcarrier spacing SCS of the first communication device and a reference subcarrier spacing of the reference signal;

step 102: sending the generated reference signal to the second communication device, so that after the second communication device detects the reference signal, the amplitude scaling factor is combined based on the detected received power of the reference signal

And calculating the interference condition to the corresponding reference signal transmitting base station when the corresponding reference signal transmitting base station normally transmits DL data.

In this embodiment, the communication device at the transmitting end, by designing different reference signal frequency domain structures for different numerology base stations, allows the 5GNR base station to be able to transmit the dedicated reference signal based on its numerology, and can make the time domain waveforms of the dedicated reference signals transmitted by the different numerology base stations consistent; at the receiving end, multiplexing of UL frequency domain received data (i.e. UL received data after FFT) is allowed, and the frequency domain sequence of the dedicated reference signal can be correctly restored through simple frequency domain processing, so as to reduce the processing complexity required when the receiving end detects the dedicated reference signal.

wherein p denotes an antenna port number for transmitting the reference signal,

represents the transmitted signal on the k sub-carrier of the p antenna port,

represents a frequency domain start position of the reference signal,

Q is determined according to at least one of the following formulas:

the value is greater than or equal to zero; or the like, or, alternatively,

wherein the content of the first and second substances,

Subcarrier spacing SCS for a first communication device_TRP＝2^μ。

wherein p denotes an antenna port number for transmitting the reference signal,

represents the transmitted signal on the k sub-carrier of the p antenna port,

represents a frequency domain start position of the reference signal,

denotes a first preset parameter, set Q1, wherein,

the value is greater than or equal to zero.

Further, the first preset parameter

Is the ratio of the energy per resource element EPRE of the non-zero elements of the reference signal transmitted on the p-th antenna port to the EPRE of the non-zero elements of the PDSCH.

Further, the first preset parameter

Is equal to a ratio of a reference SCS of the reference signal to an SCS of the first communication device.

Further, at least one of the following parameters is determined by at least one indication method of pre-defined, operation, administration and maintenance, OAM, configuration and backhaul signaling indication between base stations:

transmitting an antenna port number p of the reference signal;

the base sequence of the reference signal transmitted on the p-th antenna port

Reference SCS configuration SCS for the reference signal_referenceRS；

A first preset parameter of the reference signal sent on the p-th antenna port

Frequency domain starting position of the reference signal

Further, the reference signal is periodically sent in the time domain, and at least one of the following parameters is determined by at least one indication method of pre-specification, OAM configuration, and backhaul signaling indication between base stations:

a time domain transmission period of the reference signal;

a duration of the reference signal within the time domain transmission period.

Further, the reference signal is repeatedly sent in the time domain according to preset times, and at least one of the following parameters is determined by at least one indication method of presetting, OAM configuration and backhaul signaling indication between base stations:

the time domain of the reference signal starts to send time;

a single duration of the reference signal;

the number of times of repeated transmission of the reference signal;

Further, the time unit is indicated according to at least one of the following methods:

an absolute time length;

determining the number of symbols of an orthogonal frequency division multiplexing symbol OS according to the reference SCS of the reference signal;

An embodiment of the present invention further provides a reference signal sending method, which is applied to a first communication device, and as shown in fig. 9, the method includes:

step 201: generating a reference signal having a cyclic shift characteristic in a time domain with a minimum cyclic shift period of 1/SCS_referenceRSWherein, SCS_referenceRSA reference SCS representing a reference signal;

step 202: and transmitting the generated reference signal to the second communication device.

Further, when the reference SCS of the reference signal is greater than or equal to the SCS of the first communication device, the reference signal cyclic shift period is 1/SCS_TRPWherein, SCS_TRPA subcarrier spacing, SCS, representative of the first communication device.

Further, the reference signal is at slave/when the reference SCS of the reference signal is greater than or equal to the SCS of the first communication device₁To l₂Continuous l₂-l₁Orthogonal frequency division multiplexing OFDM baseband signal generated in time zone composed of +1 orthogonal frequency division multiplexing symbol OS

Has the following characteristics:

wherein the content of the first and second substances,

represents from l₁To l₂Continuous l₂-l₁+1 OS duration.

Further, when the reference SCS for the reference signal is greater than or equal to the SCS of the first communication device,the reference signal is at slave/₁To l₂Continuous l₂-l₁The OFDM baseband signal generated in the time interval consisting of +1 OS is

Wherein the content of the first and second substances,

representing the transmitted signal on the k sub-carrier of the p antenna port,

SCS_referenceRSreference SCS configuration representing a reference signal, N_RBRepresents the number of RBs (Resource Block ),

indicates the number of subcarriers, a, in each RB^～Is a full frequency domain bandwidth signal.

Further, the reference signal is at slave/when the reference SCS of the reference signal is less than or equal to the SCS of the first communication device₁To l₂Continuous l₂-l₁The OFDM baseband signal generated in the time interval consisting of +1 OS is

Wherein the content of the first and second substances,

representing the transmitted signal on the k sub-carrier of the p antenna port,

Further, the first communication device is at slave/₁To l₂Continuous l₂-l₁The total OFDM baseband signal generated in the time interval consisting of +1 OS is

Wherein the content of the first and second substances,

is at the slave l₁To l₂Continuous l₂-l₁An OFDM baseband signal generated from other signals except the reference signal in a time interval consisting of +1 OSs;

and is

Wherein the content of the first and second substances,

The following characteristics are required:

if it is not

transmitting an antenna port number p of the reference signal;

the base sequence of the reference signal transmitted on the p-th antenna port

Reference SCS configuration S of the reference signalCS_referenceRS；

Frequency domain starting position of the reference signal

a time domain transmission period of the reference signal;

a duration of the reference signal within the time domain transmission period.

the time domain of the reference signal starts to send time;

a single duration of the reference signal;

the number of times of repeated transmission of the reference signal;

an absolute time length;

An embodiment of the present invention further provides a reference signal receiving method, which is applied to a second communications device, and as shown in fig. 10, the method includes:

step 301: receiving a reference signal transmitted by a first communication device on a frequency domain;

step 302: and obtaining a basic sequence of the reference signal according to the received reference signal.

Further, when the reference SCS of the reference signal is greater than or equal to the SCS of the second communication device, the reference signal is received

Obtaining a base sequence of the reference signal

The method comprises the following steps:

wherein p denotes an antenna port number for transmitting the reference signal,

represents a frequency domain starting position of the reference signal,

is shown inBasic sequence, M, of the reference signal transmitted on the p-th antenna port_RSRepresents the length of the base sequence of the reference signal,

Further, when the reference SCS of the reference signal is less than or equal to the SCS of the second communication device, the reference signal is received

Obtaining a base sequence of the reference signal

The method comprises the following steps:

wherein p denotes an antenna port number for transmitting the reference signal,

represents a frequency domain starting position of the reference signal,

representing the basic sequence of said reference signal at the p-th antenna port, M_RSDenotes the length of the base sequence of the reference signal, Q ═ 1.

transmitting an antenna port number p of the reference signal;

the base sequence of the reference signal transmitted on the p-th antenna port

Reference SCS configuration SCS for the reference signal_referenceRS；

A first preset parameter of the reference signal sent on the p-th antenna port

Frequency domain starting position of the reference signal

In this embodiment, the communication device at the transmitting end, by designing different reference signal frequency domain structures for different numerology base stations, allows the 5GNR base station to be able to transmit the dedicated reference signal based on its numerology, and can make the time domain waveforms of the dedicated reference signals transmitted by different numerology base stations consistent; at the receiving end, multiplexing of UL frequency domain received data (i.e. UL received data after FFT) is allowed, and the frequency domain sequence of the dedicated reference signal can be correctly restored through simple frequency domain processing, so as to reduce the processing complexity required when the receiving end detects the dedicated reference signal.

The reference signal transmitting method and the receiving method of the present invention are further described below with reference to specific embodiments and accompanying drawings:

detailed description of the preferred embodiment

The present embodiment provides a method for transmitting a reference signal applied to a transmitting base station (i.e. the first communication device), wherein a mapping relationship of frequency domain resources is as follows:

wherein p represents an antenna port number for transmitting the reference signal;

represents a transmission signal on a k-th subcarrier of a p-th antenna port;

representing a frequency domain starting position of the reference signal;

a base sequence representing the reference signal transmitted on the p-th antenna port, wherein M_RSRepresents a length of a base sequence of the reference signal;

an amplitude scaling factor representing the reference signal transmitted on the p-th antenna port;

when the reference SCS of the reference signal is greater than or equal to the SCS of the first communication device,

adapting the factorization for numerology, wherein SCS_TRPSCS, SCS indicating currently transmitting base station_referenceRSRepresenting a reference SCS configuration of the reference signal.

Wherein the content of the first and second substances,

is a numerology adaptation factor. Fig. 13a to 13c are schematic diagrams illustrating a frequency domain resource mapping method for the reference signal when Q takes different values. In fig. 13a, the subcarrier spacing is 60kHz, in fig. 13b, the subcarrier spacing is 30kHz, and in fig. 13c, the subcarrier spacing is 15 kHz.

As shown in FIG. 13a, a reference SCS (SCS) without reference signal_referenceRS) Is 60 kHz.

SCS (SCS) when transmitting base station_TRP) Equal to 60kHz, the transmitting base station is based on

Wherein

Generates a frequency domain reference signal as shown in fig. 13 a. Visually, the basic sequence of the reference signal is mapped to the frequency domain resource in sequence;

SCS (SCS) when transmitting base station_TRP) Equal to 30kHz, the transmitting base station is based on

Wherein

Generates a frequency domain reference signal as shown in fig. 13 b. Intuitively, the basic sequence of the reference signal is mapped onto frequency domain resources in a comb structure, wherein the spacing between combs is Q ═ 2, and zero padding is performed on the frequency domain resources to which the basic sequence is not mapped;

SCS (SCS) when transmitting base station_TRP) Equal to 15kHz, said transmitting base station is based on

Wherein

Generates a frequency domain reference signal as shown in fig. 13 c. Intuitively, the basic sequence of the reference signal is mapped onto frequency domain resources in a comb structure, wherein the spacing between combs is Q-4, and zero padding is performed on the frequency domain resources to which the basic sequence is not mapped.

And when the reference SCS of the reference signal is less than or equal to the SCS of the first communication device, the reference signal is generated according to the following formula, setting Q to 1.

For example, reference SCS (SCS) without reference signal_referenceRS) Is 60 kHz.

SCS (SCS) when transmitting base station_TRP) Equal to 120kHz, the transmitting base station is based on

The manner in which Q is 1 generates a frequency domain reference signal as shown in fig. 13 a. Visually, the basic sequence of the reference signal is mapped to the frequency domain resource in sequence;

for the

And taking the relation between the value and the p, and multiplexing the reference signals sent by a plurality of antenna ports by a single base station and/or a plurality of base stations in a frequency division multiplexing and/or code division multiplexing mode.

The frequency division multiplexing mode refers to: the reference signals transmitted by a single base station or and/or multiple base stations are orthogonal in the frequency domain. The specific implementation method comprises the following steps: configuring different antenna ports for a plurality of base stations, or configuring a plurality of antenna ports for a single base station, and the reference signals transmitted on each antenna port have orthogonal frequency domain resources. E.g. mapping the reference signals of different antenna ports to different frequency domain starting positions

The above.

The code division multiplexing mode refers to: the base sequences of the reference signals transmitted by a single base station or/and multiple base stations have low cross-correlation properties in the code domain. The specific implementation method comprises the following steps: configuring different antenna ports for a plurality of base stations, or configuring a plurality of antenna ports for a single base station, and the reference signal transmitted on each antenna port has a different basic sequence. Allowing said referencing of different antenna ports when using code division multiplexingSignal mapping to same frequency domain starting position

The above.

Further, the amplitude scaling factor

The square of (d) represents the ratio of the EPRE (Energy Per RE) of the non-zero elements of the reference signal to the EPRE of the non-zero elements of the PDSCH.

After the receiving base station (i.e. the second communication device) detects the reference signal, the receiving base station combines an amplitude scaling factor based on the detected received power of the reference signal

The interference situation to the base station when the corresponding reference signal transmitting base station normally transmits the DL data can be calculated.

Further, the amplitude scaling factor

Is equal to

By the reference signal transmission method of the embodiment, it can be ensured that the total power on the corresponding OFDM symbol is substantially unchanged regardless of whether the base station transmits the reference signal.

By fixing the amplitude scaling factor

On one hand, signaling overhead required by the receiving base station for estimating the interference condition of the DL data normally transmitted by the corresponding reference signal transmitting base station to the receiving base station can be simplified, namely the receiving base station is informed of the amplitude scaling factor without extra signaling

The value of (a). In another aspect, the amplitude is scaled by a factor

Is fixedly arranged as

And the influence of the reference signal sending behavior on the performance of normal data transmission of the reference signal sending base station and the adjacent stations can be reduced.

The EPRE of the PDSCH non-zero elements on different OSs is not assumed to remain substantially unchanged. The total power over the corresponding OFDM symbol should remain substantially unchanged regardless of whether the reference signal is transmitted or not.

Otherwise, if the reference signal is transmitted, which will cause the total power on the corresponding OFDM symbol to change significantly, for the transmitting base station, the dynamic change range of the DL received signal power of the served UE on the adjacent OS will be increased, which may further affect the reception performance of the DL data at the UE side; while for the neighbor base station of the transmitting base station, it will experience interference signals that vary significantly from OS to OS, and will also affect the DL data reception performance of its served UEs.

In order to make the total power on the corresponding OFDM symbol substantially unchanged regardless of whether the base station transmits the reference signal, the method adopted in this embodiment is: setting the amplitude scaling factor

Is equal to

Then do not set Q.M on OS_RSRE, and denote EPRE of PDSCH as EIRP_PDSCH. Then when there is only PDSCH on the OS, the total power on the OS is P_{PDSCH_OS}＝Q·M_RS·EIRP_PDSCH。

When only the reference signal exists on the OS, the basic sequence of the reference signal is mapped on the frequency domain resource in a comb structure, and the basic sequence is longDegree of M_RSAnd the comb spacing is Q, the EPRE of the non-zero element of the reference signal is

Since only M exists on the OS_RSA non-zero element, so that the total power on the OS is P_{RS_OS}＝M_RS·EIRP_RS＝M_RS·Q·EIRP_PDSCH＝P_{PDSCH_OS}。

Thus, the amplitude is scaled by a factor

Is arranged as

It can be ensured that the total power on the corresponding OFDM symbol remains substantially unchanged regardless of whether the base station transmits the reference signal or not.

Detailed description of the invention

The present embodiment provides a reference signal transmission method applied to a transmission base station (i.e., the first communication device described above) that is receiving a reference signal from a secondary communication device₁To l₂Continuous l₂-l₁OFDM baseband signal generated in time interval composed of +1 OS

Has the following characteristics:

wherein, SCS_TRPSCS representing a currently transmitting base station;

represents from l₁To l₂Continuous l₂-l₁+1 OS duration.

The embodiment describes that the reference signal has a cyclic shift characteristic in the time domain through a mathematical formula and is cyclicRing shift period of

Not provided for by N_FFTThe FFT operation of the point generates the OFDM baseband signal of the reference signal, and the corresponding time domain sampling interval is

Let the CP of the first OS include N_CP,lSample points, the time domain length of the ith OS is (N)_CP,l+N_FFT)T_s。

Then the slave l can be further processed₁To l₂Continuous l₂-l₁Duration of +1 OS

Expressed as:

the time domain cyclic shift characteristics of the OFDM baseband signal generated by the reference signal can also be equivalently expressed as:

in a specific example A, the reference signal is at the slave I₁To l₂Continuous l₂-l₁The OFDM baseband signal generated in the time interval of +1 OS is

Wherein the content of the first and second substances,

it is clear that,

that is, the OFDM baseband signal generation method of the reference signal designed according to the specific example a conforms to the characteristics described in the present embodiment. The time domain waveform of the reference signal according to the specific example a is shown in fig. 14.

Reference SCS (SCS) without reference signal_referenceRS) Is 60 kHz.

SCS_TRP＝60kHz

SCS (SCS) when transmitting base station_TRP) Equal to 60kHz, if the time domain duration of the reference signal is configured to 8 OSs (set with respect to the SCS of the transmitting base station), a waveform having a time domain cyclic shift characteristic as shown in fig. 14 will be generated by the OFDM baseband signal generation method shown in specific example a.

SCS_TRP＝30kHz

SCS (SCS) when transmitting base station_TRP) Equal to 30kHz, if the time domain duration of the reference signal is configured to 4 OSs (set with respect to the SCS of the transmitting base station), it is also possible to generate a waveform having a time domain cyclic shift characteristic as shown in fig. 14.

Note that the FFT/IFFT transformation has the following properties: the frequency domain signal dispersion corresponds to a time domain signal period repetition. Since the reference SCS is 60kHz and the SCS of the transmitting base station is 30kHz, the reference signal adopts a comb structure (comb spacing is 2 RE) in the frequency domain, corresponding to frequency domain dispersion, the time domain signal generated by its IFFT has a periodic repetition characteristic, i.e. within the IFFT time domain window of 1/30kHz as shown in fig. 14, there are 2 periodic repetition signals, and the signal in each period is the same as the time domain IFFT signal generated when the SCS of the transmitting base station is equal to 60kHz and the same basic sequence of the reference signal is adopted.

After IFFT transformation, by the OFDM baseband signal generation method shown in the above scheme, taking the IFFT time domain window of 1/30kHz as a repetition period, and filling 4 OSs (set relative to the SCS of the transmitting base station) with the IFFT signal in a cyclic shift manner, a waveform with time domain cyclic shift characteristics as shown in fig. 14 can be obtained.

It can be seen that, by the methods described in the foregoing embodiments one and two, when the reference signal basic sequences are the same and the time domain lengths of the generated reference signals are consistent, the time domain reference signal waveforms finally generated by the transmitting base station are the same no matter which SCS is used by the transmitting base station.

For SCS_TRPThe same applies to the case of 60kHz, which is not described in detail here.

In a specific example B, the transmitting base station is in slave i₁To l₂Continuous l₂-l₁The total OFDM baseband signal generated in the time interval of +1 OS is

Wherein the content of the first and second substances,

is at the slave l₁To l₂Continuous l₂-l₁A total OFDM baseband signal generated by the transmitting base station during a time interval consisting of +1 OSs;

is in a slave I₁To l₂Continuous l₂-l₁An OFDM baseband signal generated by the reference signal in a time interval composed of +1 OSs;

is at the slave l₁To l₂Continuous l₂-l₁OFDM baseband signals generated by other signals (including control, data and other reference signals) except the reference signal in the time interval composed of +1 OS;

and is

Wherein the content of the first and second substances,

represents the OFDM baseband signal generated by other signals (including control, data and other reference signals) except the reference signal on the I-th OS, and

wherein the content of the first and second substances,

represents the frequency domain signals of other signals (including control, data and other reference signals) except the reference signals on the (k, l) -th RE resource grid on the p-th antenna port. Wherein, the

The following characteristics are required:

if

detailed description of the preferred embodiment

The present embodiment provides a reference signal receiving method applied to a receiving base station (i.e., the second communication device described above), which receives a signal according to a frequency domain

Obtaining a base sequence of the reference signal

The method comprises

represents a received signal on a k-th subcarrier of a p-th antenna port;

representing a frequency domain starting position of the reference signal;

a base sequence representing the reference signal detected on the p-th antenna port, wherein M_RSRepresents a length of a base sequence of the reference signal;

The embodiment provides an efficient solution designed based on a reference signal time-frequency structure. At a transmitting end, the scheme allows a 5G NR base station to transmit the dedicated reference signal based on self numerology by designing different dedicated reference signal frequency domain structures for different numerology base stations, and can make time domain waveforms of the dedicated reference signals transmitted by different numerology base stations consistent; at the receiving end, multiplexing of UL frequency domain received data (i.e. UL received data after FFT transformation) is allowed, and the frequency domain sequence of the dedicated reference signal can be correctly restored through simple frequency domain processing, so as to reduce the processing complexity required when the receiving end detects the dedicated reference signal.

Embodiments of the present invention also provide a first communication device, as shown in fig. 11, including a processor 11 and a transceiver 12,

the processor 11 is configured to generate a reference signal sent on each antenna port according to a basic sequence of a reference signal to be sent, a subcarrier spacing SCS of the first communication device, and a reference subcarrier spacing of the reference signal;

the transceiver 12 is configured to send the generated reference signal to the second communication device, so that the second communication device detects the reference signal and combines the amplitude scaling factor with the received power of the reference signal based on the detected received power

In this embodiment, the communication device at the transmitting end, by designing different reference signal frequency domain structures for different numerology base stations, allows the 5G NR base station to be able to transmit the dedicated reference signal based on its numerology, and may keep the time domain waveforms of the dedicated reference signals transmitted by the different numerology base stations consistent; at the receiving end, multiplexing of UL frequency domain received data (i.e. UL received data after FFT) is allowed, and the frequency domain sequence of the dedicated reference signal can be correctly restored through simple frequency domain processing, so as to reduce the processing complexity required when the receiving end detects the dedicated reference signal.

Further, when the reference SCS of the reference signal is greater than or equal to the SCS of the first communication device, the processor 11 is specifically configured to generate the reference signal according to the following formula:

wherein p denotes an antenna port number for transmitting the reference signal,

represents the transmitted signal on the k sub-carrier of the p antenna port,

represents a frequency domain starting position of the reference signal,

the value is greater than or equal to zero; or the like, or, alternatively,

wherein the content of the first and second substances,

Subcarrier spacing SCS for a first communication device_TRP＝2^μ。

Further, the amplitude scaling factor

Is arranged as

Further, when the reference SCS of the reference signal is less than or equal to the SCS of the first communication device, the processor 11 is specifically configured to generate the reference signal according to the following formula:

wherein p denotes an antenna port number for transmitting the reference signal,

represents the transmitted signal on the k sub-carrier of the p antenna port,

represents a frequency domain starting position of the reference signal,

denotes a first preset parameter, set Q1, wherein,

the value is greater than or equal to zero.

Further, the first preset parameter

Is the non-square of the reference signal transmitted on the p-th antenna portA ratio of energy per resource element EPRE of zero element to EPRE of non-zero element of PDSCH.

Further, the first preset parameter

Further, the processor 11 is specifically configured to determine at least one of the following parameters by at least one indication method of predefined, operation, administration and maintenance, OAM, configuration, and backhaul signaling indication between base stations:

transmitting an antenna port number p of the reference signal;

the base sequence of the reference signal transmitted on the p-th antenna port

Reference SCS configuration SCS for the reference signal_referenceRS；

The first predetermined material

Frequency domain starting position of the reference signal

Further, the transceiver 12 is specifically configured to periodically send the reference signal in the time domain, and determine at least one of the following parameters by at least one indication method of predefined, OAM configuration, and backhaul signaling indication:

a time domain transmission period of the reference signal;

a duration of the reference signal within the time domain transmission period.

Further, the transceiver 12 is specifically configured to repeatedly send the reference signal according to a preset number of times in a time domain, and determine at least one of the following parameters by at least one indication method of predefined, OAM configuration, and backhaul signaling indication between base stations:

the time domain of the reference signal starts to send time;

a single duration of the reference signal;

the number of times of repeated transmission of the reference signal;

an absolute time length;

the number of OS symbols determined according to the SCS of the second communication device.

the processor 11 is configured to generate a reference signal having a cyclic shift characteristic in a time domain and a minimum cyclic shift period of 1/SCS_referenceRSWherein, SCS_referenceRSA reference SCS representing a reference signal;

the transceiver 12 is configured to transmit the generated reference signal to a second communication device.

When the reference SCS of the reference signal is greater than or equal to the SCS of the first communication device, the reference signal is at the secondary l₁To l₂Continuous l₂-l₁Time composed of +1 OFDM symbols OSOFDM baseband signal generated in inter-interval

Has the following characteristics that:

wherein the content of the first and second substances,

represents from l₁To l₂Continuous l₂-l₁+1 OS duration.

Further, the reference signal is at slave/when the reference SCS of the reference signal is greater than or equal to the SCS of the first communication device₁To l₂Continuous l₂-l₁The OFDM baseband signal generated in the time interval consisting of +1 OS is

Wherein the content of the first and second substances,

representing the transmitted signal on the k sub-carrier of the p antenna port,

Wherein the content of the first and second substances,

representing the transmitted signal on the k sub-carrier of the p antenna port,

Further, the processor 11 is in slave l₁To l₂Continuous l₂-l₁The total OFDM baseband signal generated in the time interval consisting of +1 OS is

Wherein the content of the first and second substances,

is at the slave l₁To l₂Continuous l₂-l₁Total generated by the first communication device in a time interval of +1 OSThe OFDM baseband signal of (a);

and is

wherein the content of the first and second substances,

The following characteristics are required:

if it is not

Further, the processor 11 is configured to determine at least one of the following parameters by at least one indication method of predefined, operation, administration and maintenance, OAM, configuration, and backhaul signaling indication between base stations:

transmitting an antenna port number p of the reference signal;

the base sequence of the reference signal transmitted on the p-th antenna port

Reference SCS configuration SCS for the reference signal_referenceRS；

Frequency domain starting position of the reference signal

Further, the transceiver 12 is configured to periodically transmit the reference signal in a time domain, and determine at least one of the following parameters by at least one indication method of predefined, OAM configured, and backhaul signaling indication:

a time domain transmission period of the reference signal;

a duration of the reference signal within the time domain transmission period.

Further, the transceiver 12 is configured to repeatedly transmit the reference signal according to a preset number of times in a time domain, and determine at least one of the following parameters by at least one indication method of pre-defined, OAM configuration, and inter-base station backhaul signaling indication:

the time domain of the reference signal starts to send time;

a single duration of the reference signal;

the number of times of repeated transmission of the reference signal;

an absolute time length;

The embodiment of the present invention also provides a second communication device, as shown in fig. 12, including a processor 21 and a transceiver 22,

the transceiver 22 is configured to receive a reference signal transmitted by a first communication device in a frequency domain;

the processor 21 is configured to obtain a base sequence of the reference signal according to the received reference signal.

Further, the processor is configured to receive a reference signal when the reference SCS of the reference signal is greater than or equal to the SCS of the second communication device

Obtaining a base sequence of the reference signal

The method comprises the following steps:

wherein p denotes an antenna port number for transmitting the reference signal,

represents a frequency domain starting position of the reference signal,

representing an amplitude scaling factor of the reference signal transmitted on the p-th antenna port,

Further, the processor 21 is configured to receive the reference signal according to the received reference signal by the following method when the reference SCS of the reference signal is less than or equal to the SCS of the second communication device

Obtaining a base sequence of the reference signal

Wherein p denotes an antenna port number for transmitting the reference signal,

representing the frequency domain of the reference signalAt the start position of the device, the device is provided with a starting position,

Further, the processor 21 is configured to determine at least one of the following parameters by at least one indication method of predefined, OAM configuration, backhaul signaling indication between base stations:

transmitting an antenna port number p of the reference signal;

the base sequence of the reference signal transmitted on the p-th antenna port

Reference SCS configuration SCS for the reference signal_referenceRS；

Amplitude scaling factor of the reference signal transmitted on the p-th antenna port

Frequency domain starting position of the reference signal

Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement the information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

The foregoing is a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should be construed as the protection scope of the present invention.

Claims

1. A method for transmitting a reference signal, applied to a first communication device, the method comprising:

transmitting the generated reference signal to the second communication device;

wherein p denotes an antenna port number for transmitting the reference signal,

represents the transmitted signal on the k sub-carrier of the p antenna port,

represents a frequency domain starting position of the reference signal,

Q＝SCS_referenceRS/SCS_TRP，SCS_TRPSCS, SCS representing the first communication device_referenceRSA reference SCS representing a reference signal, wherein,

a value greater than or equal to zero; or the like, or, alternatively,

Subcarrier spacing SCS for a first communication device_TRP＝2^μ(ii) a And/or

wherein p denotes an antenna port number for transmitting the reference signal,

represents the transmitted signal on the k sub-carrier of the p antenna port,

represents a frequency domain starting position of the reference signal,

denotes a first preset parameter, set Q1, wherein,

the value is greater than or equal to zero.

2. The method according to claim 1, wherein the reference signal is transmitted from the base station,

the first preset parameter

The square of (d) is the ratio of the energy per resource element EPRE of the non-zero elements of the reference signal transmitted on the p-th antenna port to the EPRE of the non-zero elements of the PDSCH.

3. The method according to claim 1, wherein the first predetermined parameter is set as

4. The method for sending reference signals according to claim 1, wherein at least one of the following parameters is determined by at least one indication method of predefined, operation, administration and maintenance, OAM, configuration, backhaul signaling indication between base stations:

transmitting an antenna port number p of the reference signal;

the base sequence of the reference signal transmitted on the p-th antenna port

Reference SCS configuration SCS of the reference signal_referenceRS；

The first preset parameter

Frequency domain starting position of the reference signal

5. The method according to claim 1, wherein the reference signal is periodically transmitted in a time domain, and at least one of the following parameters is determined by at least one indication method selected from a predefined indication method, an OAM configuration indication method, and an inter-base station backhaul signaling indication method:

a time domain transmission period of the reference signal;

a duration of the reference signal within the time domain transmission period.

6. The method according to claim 1, wherein the reference signal is repeatedly transmitted according to a preset number of times in a time domain, and at least one of the following parameters is determined by at least one indication method selected from a predefined method, an OAM configuration method, and an inter-base station backhaul signaling indication method:

the time domain of the reference signal starts to send time;

a single duration of the reference signal;

the number of times of repeated transmission of the reference signal;

7. The method of claim 5 or 6, wherein the time unit is indicated according to at least one of the following methods:

an absolute time length;

8. A method for receiving a reference signal, the method being applied to a second communication device, the method comprising:

obtaining a basic sequence of the reference signal according to the received reference signal;

Obtaining a base sequence of the reference signal

The method comprises the following steps:

wherein p denotes an antenna port number for transmitting the reference signal,

indicating the received signal of the second communication device on the k sub-carrier of the p antenna port,

represents a frequency domain starting position of the reference signal,

SCS_TRPSCS, SCS representing the second communication device_referenceRSA reference SCS configuration representing a reference signal; and/or

Obtaining a base sequence of the reference signal

The method comprises the following steps:

wherein p denotes an antenna port number for transmitting the reference signal,

represents a frequency domain starting position of the reference signal,

9. The reference signal receiving method according to claim 8, wherein at least one of the following parameters is determined by at least one indication method of predefined, operation, administration and maintenance, OAM, configuration, backhaul signaling indication between base stations:

transmitting an antenna port number p of the reference signal;

reference SCS configuration SCS for the reference signal_referenceRS；

Frequency domain starting position of the reference signal

The base sequence of the reference signal transmitted on the p-th antenna port

A first preset parameter of the reference signal sent on the p-th antenna port

10. A first communications device comprising a processor and a transceiver,

the transceiver is used for transmitting the generated reference signal to a second communication device;

wherein p denotes an antenna port number for transmitting the reference signal,

represents the transmitted signal on the k sub-carrier of the p antenna port,

represents a frequency domain starting position of the reference signal,

a base sequence, M, representing the reference signal transmitted on the p-th antenna port_RSIndicates the length of the base sequence of the reference signal,

the value is greater than or equal to zero; or the like, or, alternatively,

wherein the content of the first and second substances,

Subcarrier spacing SCS for a first communication device_TRP＝2^μ(ii) a And/or

wherein p denotes an antenna port number for transmitting the reference signal,

represents the transmitted signal on the k sub-carrier of the p antenna port,

represents a frequency domain starting position of the reference signal,

denotes a first preset parameter, set Q1, wherein,

the value is greater than or equal to zero.

11. A second communications device comprising a processor and a transceiver,

the processor is used for obtaining a basic sequence of the reference signal according to the received reference signal;

Obtaining a base sequence of the reference signal

The method comprises the following steps:

wherein p denotes an antenna port number for transmitting the reference signal,

represents a frequency domain starting position of the reference signal,

The processor is configured to receive a reference signal from a second communication device when a reference SCS of the reference signal is less than or equal to an SCS of the second communication device

Obtaining a base sequence of the reference signal

The method comprises the following steps:

wherein p denotes an antenna port number for transmitting the reference signal,

represents a frequency domain starting position of the reference signal,

12. A communication device comprising a memory, a processor and a computer program stored on the memory and executable on the processor; wherein the processor implements the reference signal transmission method according to any one of claims 1 to 7 or implements the reference signal reception method according to any one of claims 8 to 9 when executing the program.

13. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, is characterized in that it implements the steps in the reference signal transmission method according to any one of claims 1 to 7 or in the reference signal reception method according to any one of claims 8 to 9.