WO2020063930A1

WO2020063930A1 - Reference signal sending and receiving method and apparatus

Info

Publication number: WO2020063930A1
Application number: PCT/CN2019/108770
Authority: WO
Inventors: 费永强; 郭志恒; 谢信乾
Original assignee: 华为技术有限公司
Priority date: 2018-09-28
Filing date: 2019-09-27
Publication date: 2020-04-02
Also published as: WO2020063930A9

Abstract

Provided by the present application are a reference signal sending and receiving method and an apparatus, which are used to provide a method for measuring between base stations. The method comprises: base station 1 sending a reference signal to base station 2 on a second resource, wherein the second resource comprises M continuous downlink OFDM symbols; in the M continuous downlink OFDM symbols, a reference signal carried between any two adjacent OFDM symbols satisfies cyclic characteristics on the time domain, or a phase difference value between reference signals carried on sub-carriers of any two OFDM symbols has a linear relationship with a sub-carrier index; base station 2 determining a first resource for receiving the reference signal, the first resource comprising an uplink OFDM symbol and/or a guard interval, and base station 2 receiving the reference signal on the first resource.

Description

Method and device for sending and receiving reference signals

Cross-reference to related applications

This application claims the priority of a Chinese patent application filed on September 28, 2018 with the Chinese Patent Office under the application number 201811143498.1 and the application name is "A Method and Device for Sending and Receiving a Reference Signal", the entire contents of which are incorporated by reference. In this application; this application claims the priority of a Chinese patent application filed on January 9, 2019, with the Chinese Patent Office, application number 201910020561.0, and application name "A Method and Device for Sending and Receiving a Reference Signal", which The entire contents are incorporated herein by reference.

Technical field

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

Background technique

In wireless communication systems, such as new wireless (new radio, NR), long term evolution (LTE), and evolved LTE (LTE-advanced (LTE-A)) communication systems, if the system uses time division (time division) duplex (TDD) duplex mode, cross-link interference (CLI) may be generated between a base station (BS) and a base station. The so-called heterogeneous interference between base stations mainly refers to a downlink (DL) signal sent by one base station interfering with an uplink (UL) signal of another base station. The uplink signal may be, for example, a user equipment (UE) Signal sent to the base station. For example, when the first base station sends a downlink signal, the second base station is receiving an uplink signal. The downlink signal sent by the first base station is generally relatively large in power and may be received by the second base station, which may interfere with the second base station receiving the uplink signal.

The CLI between base stations usually occurs when two TDD cells operating on the same frequency have different transmission directions. Therefore, if the transmission direction of the TDD cell is the same, the CLI is usually not generated. There are exceptions: two base stations that are far apart in geographical position, even if they are transmitting in the same direction (that is, receiving uplink / sending downlink signals at the same time), but due to the long distance between them, a downlink signal from one base station is caused. There has been a significant delay when arriving at another base station, and at this time the other base station has switched from the downlink transmission direction to the uplink reception direction. Therefore, the downlink signal of the remote base station interferes with the reception of the uplink signal of the local base station, that is, it generates CLI.

Ultra-long-distance interference between base stations is usually caused by the tropospheric bending phenomenon; whether it causes interference between base stations, interference distance and delay is affected by geographical location and weather, so it has great uncertainty. In order to combat ultra-long-distance interference, you can use methods such as reducing the transmitting power of the interfering station and reducing the number of downlink transmitted symbols. However, before implementing the interference reduction solution, you must first perform measurements between base stations to identify the existence of ultra-long-distance interference, or Identify interfering base stations.

In NR, there is currently no standardized reference signal used for measurement between NR base stations (gNodeB, gNB), that is, between gNB and gNB, and there is no standardized related measurement process.

Summary of the Invention

The present application provides a method and a device for transmitting and receiving a reference signal, so as to provide a reference signal for measurement between NR base stations.

In a first aspect, an embodiment of the present application provides a method for sending a reference signal, which may be executed by a network device, including:

Sending reference signals carried on M consecutive orthogonal frequency division multiplexed OFDM symbols;

Among the M consecutive OFDM symbols, the phase between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol. The phase difference is determined by the index of the first subcarrier, wherein the first OFDM symbol and the second OFDM symbol are any two OFDM symbols among the M consecutive OFDM symbols, and M is a value greater than or equal to 2. Integer.

The above solution provides a method for measuring between base stations, and the cyclic characteristics are satisfied between reference signals carried by different OFDM symbols, so that the receiver can obtain a complete reference signal within a detection window when detecting the reference signal.

In a possible design, the method further includes: among the M consecutive OFDM symbols, a phase of a reference signal carried on a first subcarrier of a first OFDM symbol and a first subcarrier carried on a second OFDM symbol The phase difference between the phases of the reference signals on W1 is w1, the phase of the reference signal carried on the second subcarrier of the first OFDM symbol and the reference carried on the second subcarrier of the second OFDM symbol The phase difference between the phases of the signals is w2, the phase of the reference signal carried on the third subcarrier of the first OFDM symbol and the phase of the reference signal carried on the third subcarrier of the second OFDM symbol The phase difference between them is w3, between the phase of the reference signal carried on the fourth subcarrier of the first OFDM symbol and the phase of the reference signal carried on the fourth subcarrier of the second OFDM symbol. The phase difference is w4; if the difference between the index of the second subcarrier and the index of the first subcarrier is equal to the difference between the index of the fourth subcarrier and the index of the third subcarrier, then the value of (w2-w1) modulo 2π A value equal to (w4-w3) modulo 2π.

Through the above design, the phase difference between the different OFDMs and the subcarrier index have a linear relationship, so that the cyclic characteristics are satisfied between the reference signals carried by different OFDM symbols, so that the receiver can obtain a complete reference signal within a detection window.

In a possible design, the phase difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol is also The symbol length of the OFDM symbol and / or the cyclic prefix CP length of the OFDM symbol is determined.

Through the above design, the phase difference is determined based on the subcarrier index, the symbol length of the OFDM symbol, and / or the cyclic prefix CP length of the OFDM symbol, so that the cyclic characteristics are satisfied between the reference signals carried by different OFDM symbols, so that the receiver is within a detection window. A complete reference signal can be obtained.

In a possible design, the first OFDM symbol is separated from the second OFDM symbol by X OFDM symbols, the first OFDM symbol is earlier than the second OFDM symbol in the time domain, and X is greater than or An integer equal to 0; the CP length of the OFDM symbol is determined by the CP length of the X OFDM symbols and the CP length of the second OFDM symbol.

The above design provides a relationship between the reference signals carried by different OFDM symbols under the condition of satisfying the cyclic characteristics.

In a possible design, among the M consecutive OFDM symbols, any two adjacent OFDM symbols, the phase of the reference signal carried on the first subcarrier of the latter OFDM symbol and the carrier of the previous OFDM The phase difference between the phases of the reference signals on the first subcarrier of the symbol is 2πLk / N, where N is the symbol length of the OFDM symbol, L is the CP length of the OFDM symbol, and k is the index.

The method for determining the phase difference between the reference signals carried by adjacent OFDM symbols provided by the above design allows the reference signals carried by different OFDM symbols to meet the cyclic characteristics, so that the receiver can obtain a complete reference within a detection window. signal.

In a possible design, among the M consecutive OFDM symbols, the phase of the reference signal carried on the first subcarrier of the uth OFDM symbol and the first subcarrier of the vth OFDM symbol The phase difference between the phases of the reference signal is

Where N is the symbol length of the OFDM symbol, Ln is the CP length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, k Is the index of the first subcarrier.

The method for determining the phase difference between the reference signals carried by different OFDM symbols provided by the above design allows the reference signals carried by different OFDM symbols to meet the cyclic characteristics, so that the receiver can obtain a complete reference within a detection window. signal.

In a possible design, the M consecutive OFDM symbols are the last M OFDM symbols of the downlink transmission part of the uplink-downlink switching period.

The above design, on the one hand, can determine the maximum range of interference, because the RS is already the last N symbols of downlink transmission, so after the receiver detects the RS, it can be determined that the range after the time domain position of the RS is not affected by the sender. Interference can be further applied, such as lower order modulation, lower code rate, etc. for areas affected by CLI; on the other hand, the detection success rate can be guaranteed to the greatest extent.

In a possible design, the reference signal is carried on K subcarriers, K≤Kmax, where Kmax is the maximum number of system subcarriers; through the above design, the same OFDM symbol can carry not only the reference signal but also other A signal, such as a data signal, enables the base stations to perform channel measurement between the base stations and data transmission between the base station and the user equipment at the same time.

In a second aspect, an embodiment of the present application provides a method for receiving a reference signal, which may be executed by a network device, and includes: determining a first resource for receiving a reference signal, where the first resource includes an uplink OFDM symbol and / Or a guard interval; receiving a reference signal on the first resource; the reference signal is sent through a second resource, the second resource including M consecutive downlink OFDM symbols; wherein the M consecutive downlink OFDM symbols In an OFDM symbol, the phase difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol is determined by the The index is determined, wherein the first OFDM symbol and the second OFDM symbol are any two OFDM symbols of the M consecutive downlink OFDM symbols, and M is an integer greater than or equal to 2.

In one possible design, it also includes:

Among the M consecutive OFDM symbols, a phase difference between a phase of a reference signal carried on a first subcarrier of a first OFDM symbol and a phase of a reference signal carried on a first subcarrier of a second OFDM symbol Is w1, and the phase difference between the phase of the reference signal carried on the second subcarrier of the first OFDM symbol and the phase of the reference signal carried on the second subcarrier of the second OFDM symbol is w2, The phase difference between the phase of the reference signal carried on the third subcarrier of the first OFDM symbol and the phase of the reference signal carried on the third subcarrier of the second OFDM symbol is w3, which is carried in all The phase difference between the phase of the reference signal on the fourth subcarrier of the first OFDM symbol and the phase of the reference signal carried on the fourth subcarrier of the second OFDM symbol is w4;

If the difference between the index of the second subcarrier and the index of the first subcarrier is equal to the difference between the index of the fourth subcarrier and the index of the third subcarrier, the value of (w2-w1) modulo 2π is equal to (w4-w3 ) Value of modulo 2π.

In a third aspect, an embodiment of the present application provides a method for sending a reference signal, which may be executed by a network device, and includes: sending a reference signal carried on M consecutive orthogonal frequency division multiplexed OFDM symbols; Among the M consecutive OFDM symbols, any two adjacent OFDM symbols, in the time domain, the reference signal partially excluding the CP on the latter OFDM symbol and the reference partially excluding the CP on the previous OFDM symbol The signals obtained by cyclic shifting the signals are the same, and the length of the cyclic shift is determined by the cyclic prefix CP length of the OFDM symbol.

The above solution provides a method for measuring between base stations. Cyclic shift characteristics are satisfied between two adjacent OFDM symbols, so that the cyclic characteristics are satisfied between reference signals carried by different OFDM symbols, so that the receiver detects the reference. In the case of signals, a complete reference signal can be obtained within a detection window.

In a possible design, the CP length of the OFDM symbol is the CP length of the next OFDM symbol of the two adjacent OFDM symbols.

In a possible design, among the M consecutive OFDM symbols, the reference signal carried by the u-th OFDM symbol excluding the CP and the reference signal carried by the v-th OFDM symbol excluding the CP are (uv) · L long The signal obtained by the cyclic shift is the same, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, and L is the CP length of the OFDM symbol.

In the above design, the cyclic shift characteristic is satisfied between any two OFDM symbols, so that the cyclic characteristic is satisfied between the reference signals carried by different OFDM symbols, so that the receiver can obtain a complete reference signal within a detection window.

In a possible design, among the M consecutive OFDM symbols, the reference signal carried by the u-th OFDM symbol excluding the CP and the reference signal carried by the v-th OFDM symbol excluding the CP are performed

The signals obtained by the long cyclic shift are the same, Ln is the CP length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, and v is an integer greater than or equal to 1 and less than u.

In the above design, the cyclic shift characteristics are satisfied between any two OFDM symbols, so that the cyclic characteristics are satisfied between the reference signals carried by different OFDM symbols, so that the receiver can obtain a complete reference signal within a detection window.

In a fourth aspect, an embodiment of the present application provides a method for receiving a reference signal, which may be executed by a network device, and includes: determining a first resource for receiving a reference signal, where the first resource includes an uplink OFDM symbol and / Or a guard interval; receiving a reference signal on the first resource; the reference signal is sent through a second resource, the second resource including M consecutive downlink OFDM symbols; wherein the M consecutive OFDM symbols Among the symbols, any two adjacent OFDM symbols are cyclically shifted in the time domain by removing the reference signal partially carried by the CP on the latter OFDM symbol and the reference signal partially carried by the CP on the previous OFDM symbol. The signals are the same, and the length of the cyclic shift is determined by the cyclic prefix CP length of the OFDM symbol.

The signals obtained by long cyclic shift are the same, Ln is the CP length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, and v is an integer greater than or equal to 1 and less than u.

In a fifth aspect, an embodiment of the present application provides a method for receiving a reference signal, which may be executed by a network device, and includes:

Determining a first resource for receiving a reference signal according to the obtained first information; wherein the first information includes time domain resource and / or frequency domain resource location information for carrying the reference signal; and receiving on the first resource Reference signal.

In the above solution, since the signal transmission delay is negligible between the base stations that are close to each other, the sending time of the sending end can be considered as the receiving time of the receiving end. Therefore, the receiving end can know the location of the resource carrying the reference signal in advance (that is, the sending end Sending the resource position of the reference signal) to receive the reference signal at the determined resource position. Then perform channel measurement according to the reference signal, or determine the interfering base station.

In a possible design, the method further includes: obtaining second information, where the second information includes the reference signal, or parameter information required to generate the reference signal; and determining the first information according to the second information. The reference signal is received on a resource, or channel estimation is performed according to the second information and the received reference signal.

In a possible design, the first resource includes a guard time interval, or the first resource includes M downlink OFDM symbols.

According to a sixth aspect, an embodiment of the present application provides a method for sending a reference signal, including:

Sending reference signals carried on Z consecutive basic resources; the basic resources include Y consecutive third orthogonal frequency division multiplexed OFDM symbols, and a cyclic prefix CP and / or a cyclic suffix CS; The reference signals carried on the Y third OFDM symbols included in the basic resource are the same; the third OFDM symbols do not include a CP;

Among the Z consecutive basic resources, a phase between a phase of a reference signal carried on a first subcarrier of a first basic resource and a phase of a reference signal carried on a first subcarrier of a second basic resource The phase difference is determined by the index of the first subcarrier, wherein the first basic resource and the second basic resource are any two basic resources among the Z consecutive basic resources, and Z and Y are greater than or equal to An integer of 2.

Exemplarily, the length of the basic resource is equal to the sum of the lengths of the Y fourth OFDM symbols, and the fourth OFDM symbol includes a CP.

Exemplarily, the symbol lengths of the third OFDM symbol and the fourth OFDM symbol are equal, that is, the third OFDM symbol is equal to the fourth OFDM symbol after CP and / or CS are removed.

In one possible design, it also includes:

Among the Z consecutive basic resources, a phase difference between a phase of a reference signal carried on a first subcarrier of a first basic resource and a phase of a reference signal carried on a first subcarrier of a second basic resource Is w1, and the phase difference between the phase of the reference signal carried on the second subcarrier of the first basic resource and the phase of the reference signal carried on the second subcarrier of the second basic resource is w2, The phase difference between the phase of the reference signal carried on the third subcarrier of the first basic resource and the phase of the reference signal carried on the third subcarrier of the second basic resource is w3. The phase difference between the phase of the reference signal on the fourth subcarrier of the first basic resource and the phase of the reference signal carried on the fourth subcarrier of the second basic resource is w4;

If the difference between the index of the second subcarrier and the index of the first subcarrier is equal to the difference between the index of the fourth subcarrier and the index of the third subcarrier, then the value of (w2-w1) modulo 2π is equal to (w4-w3 ) Value of modulo 2π.

In a possible design, when the basic resource includes only Y consecutive third OFDM symbols and a CP, the phase of the reference signal carried on the first subcarrier of the first basic resource and the phase of the reference signal carried on the second The phase difference between the phases of the reference signals on the first subcarrier of the basic resource is also determined by the symbol length of the third OFDM symbol and / or the CP length of the basic resource.

In a possible design, the first basic resource is separated from the second basic resource by X basic resources, the first basic resource is earlier than the second basic resource in the time domain, and X is greater than or An integer equal to 0; the CP length of the basic resource is determined by the CP length of the X basic resources and the CP length of the second basic resource.

In a possible design, when the basic resource includes only Y consecutive third OFDM symbols and a cyclic prefix CP, any two adjacent basic resources among the Z consecutive basic resources, The phase difference between the phase of the reference signal carried on the first subcarrier of the latter basic resource and the phase of the reference signal carried on the first subcarrier of the previous basic resource is 2πLK / N, where N is the The symbol length of the third OFDM symbol, L is the CP length of the basic resource, and k is the index of the first subcarrier.

In a possible design, when the basic resource includes only Y consecutive third OFDM symbols and a cyclic prefix CP, the Z consecutive basic resources are carried in the first The phase difference between the phase of the reference signal on a subcarrier and the phase of the reference signal on the first subcarrier carried on the vth basic resource is

Where N is the symbol length of the third OFDM symbol, Ln is the CP length of the nth basic resource, u is an integer greater than 1 and less than or equal to Z, and v is an integer greater than or equal to 1 and less than u K is an index of the first subcarrier.

In a possible design, when the basic resource includes only Y consecutive third OFDM symbols and one CS, the phase of the reference signal carried on the first subcarrier of the first basic resource and the The phase difference between the phases of the reference signals on the first subcarriers of the two basic resources is also determined by the symbol length of the third OFDM symbol and / or the CS length of the basic resources.

In a possible design, the first basic resource is separated from the second basic resource by X basic resources, the first basic resource is earlier than the second basic resource in the time domain, and X is greater than or An integer equal to 0; the CS length of the basic resource is determined by the CS length of the X basic resources and the CS length of the first basic resource.

In a possible design, when the basic resource includes only Y consecutive third OFDM symbols and one CS, any two adjacent basic resources among the Z consecutive basic resources are carried in The phase difference between the phase of the reference signal on the first subcarrier of the latter basic resource and the phase of the reference signal carried on the first subcarrier of the previous basic resource is 2πJK / N, where N is the third The symbol length of the OFDM symbol, J is the CS length of the basic resource, and k is the index of the first subcarrier.

In a possible design, when the basic resource includes only Y consecutive third OFDM symbols and one CS, the Z consecutive basic resources are carried on the first sub-subnet of the u-th basic resource. The phase difference between the phase of the reference signal on the carrier and the phase of the reference signal on the first subcarrier carried on the v-th basic resource is

Where N is the symbol length of the third OFDM symbol, Jn is the CS length of the nth basic resource, u is an integer greater than 1 and less than or equal to Z, and v is an integer greater than or equal to 1 and less than u K is an index of the first subcarrier.

In a possible design, when the basic resource includes Y consecutive third OFDM symbols, a CS, and a CP, the phase of the reference signal carried on the first subcarrier of the first basic resource and the The phase difference between the phases of the reference signals on the first subcarrier of the second basic resource is also determined by the symbol length of the third OFDM symbol, the CS length of the basic resource, and the CP length of the basic resource.

In a possible design, the first basic resource is separated from the second basic resource by X basic resources, the first basic resource is earlier than the second basic resource in the time domain, and X is greater than or An integer equal to 0; the CS length of the basic resource is determined by the CS length of the X basic resources and the CS length of the first basic resource, and the CP length of the basic resource is determined by the CP length of the X basic resources and The CP length of the second basic resource is determined.

In a possible design, when the basic resource includes Y consecutive third OFDM symbols, one CS, and one CP, any two adjacent basic resources of the Z consecutive basic resources bear, The phase difference between the phase of the reference signal on the first subcarrier of the latter basic resource and the phase of the reference signal on the first subcarrier of the previous basic resource is 2π (L + J) k / N, Where N is the symbol length of the third OFDM symbol, L is the CP length of the basic resource, J is the CS length of the basic resource, and k is the index of the first subcarrier.

In a possible design, when the basic resource includes Y consecutive third OFDM symbols, a CS, and a CP, among the Z consecutive basic resources, the first consecutive resource is carried on the first of the u-th basic resource. The phase difference between the phase of the reference signal on the subcarrier and the phase of the reference signal on the first subcarrier carried on the vth basic resource is

Where N is the symbol length of the third OFDM symbol, Ln is the CP length of the nth basic resource, Jn is the CS length of the nth basic resource, and u is greater than 1 and less than or equal to Z. An integer, v is an integer greater than or equal to 1 and less than u, and k is an index of the first subcarrier.

In a possible design, the Z consecutive basic resources are the last Z basic resources of the downlink transmission part of the uplink-downlink switching cycle.

In a seventh aspect, an embodiment of the present application provides a method for sending a reference signal, including:

Sending reference signals carried on Z consecutive basic resources;

The basic resource includes Y consecutive third orthogonal frequency division multiplexed OFDM symbols and a cyclic prefix CP; and the reference signals carried on the Y third OFDM symbols included in one of the basic resources are the same The third OFDM symbol does not include a CP;

Among the Z consecutive basic resources, any two adjacent basic resources are, in the time domain, a reference signal carried on a third OFDM symbol included in the latter basic resource and a third signal included in the previous basic resource. The signal obtained by cyclic shifting the reference signal carried on the OFDM symbol is the same, and the length of the cyclic shift is determined by the CP length of the basic resource.

In a possible design, the CP length of the basic resource is the CP length of the latter basic resource of the two adjacent basic resources.

In a possible design, among the Z consecutive basic resources, the reference signal carried on the third OFDM symbol included in the u-th basic resource and the reference signal carried on the third OFDM symbol included in the v-th basic resource are performed. The signals obtained by (uv) · L long cyclic shift are the same, u is an integer greater than 1 and less than or equal to Z, v is an integer greater than or equal to 1 and less than u, and L is the CP length of the basic resource.

In a possible design, among the Z consecutive basic resources, the reference signal carried on the third OFDM symbol included in the u-th basic resource and the reference carried on the third OFDM symbol included in the v-th basic resource Signal

The signals obtained by the long cyclic shift are the same, Ln is the CP length of the nth basic resource, u is an integer greater than 1 and less than or equal to Z, and v is an integer greater than or equal to 1 and less than u.

In an eighth aspect, an embodiment of the present application provides a method for sending a reference signal, including:

Sending reference signals carried on Z consecutive basic resources;

The basic resource includes Y consecutive third orthogonal frequency division multiplexed OFDM symbols and a cyclic suffix CS; wherein the reference signals carried on the Y third OFDM symbols included in one of the basic resources are the same The third OFDM symbol does not include a CP;

Among the Z consecutive basic resources, any two adjacent basic resources are, in the time domain, the reference signal carried on the third OFDM symbol included in the latter basic resource and the first signal included in the previous basic resource. The signals obtained by cyclic shifting the reference signals carried on the three OFDM symbols are the same, and the length of the cyclic shift is determined by the CS length of the basic resource.

In a possible design, the CS length of the basic resource is the CS length of the previous basic resource among the two adjacent basic resources.

In a possible design, among the Z consecutive basic resources, the reference signal carried on the third OFDM symbol included in the u-th basic resource and the reference signal carried on the third OFDM symbol included in the v-th basic resource are performed. The signals obtained by (uv) · J long cyclic shift are the same, u is an integer greater than 1 and less than or equal to Z, v is an integer greater than or equal to 1 and less than u, and J is the CS length of the basic resource.

The signals obtained by the long cyclic shift are the same, Jn is the CS length of the nth basic resource, u is an integer greater than 1 and less than or equal to Z, and v is an integer greater than or equal to 1 and less than u.

In a ninth aspect, an embodiment of the present application provides a method for sending a reference signal, including:

Sending reference signals carried on Z consecutive basic resources;

The basic resource includes Y consecutive third orthogonal frequency division multiplexed OFDM symbols, and a cyclic prefix CP and a cyclic suffix CS. Among them, one basic resource includes the Y third OFDM symbols. The reference signals carried are the same; the third OFDM symbol does not include a CP;

Among the Z consecutive basic resources, any two adjacent basic resources are, in the time domain, a reference signal carried on a third OFDM symbol included in the latter basic resource and a third signal included in the previous basic resource. The signal obtained by cyclic shifting the reference signal carried on the OFDM symbol is the same, and the length of the cyclic shift is determined by the CP of the basic resource and the CS length of the basic resource.

In a possible design, the CS length of the basic resource is the CS length of the previous basic resource among the two adjacent basic resources, and the CP length of the basic resource is the two adjacent basic resources. CP length of the last basic resource in.

In a possible design, among the Z consecutive basic resources, the reference signal carried on the third OFDM symbol included in the u-th basic resource and the reference signal carried on the third OFDM symbol included in the v-th basic resource are performed. The signals obtained by (uv) · (L + J) long cyclic shift are the same, u is an integer greater than 1 and less than or equal to Z, v is an integer greater than or equal to 1 and less than u, and L is the CP length of the basic resource , J is the CS length of the basic resource.

The signal obtained by a long cyclic shift is the same, Ln is the CP length of the nth basic resource, Jn is the CS length of the nth basic resource, u is an integer greater than 1 and less than or equal to Z, and v is greater than or equal to 1 And an integer less than u.

In a tenth aspect, an embodiment of the present application provides a method for receiving a reference signal, including:

Determine a first resource for receiving a reference signal, where the first resource includes an uplink OFDM symbol and / or a guard interval;

Receiving a reference signal on the first resource; the reference signal is sent through a second resource, the second resource includes Z consecutive basic resources, and the basic resource includes Y consecutive third orthogonal frequencies Demultiplexed OFDM symbols, and a cyclic prefix CP and / or a cyclic suffix CS; wherein the reference signals carried on the Y third OFDM symbols included in one of the basic resources are the same; CP; the second resource is a downlink transmission resource (for example, the second resource includes a third OFDM symbol as a downlink OFDM symbol);

In one possible design, it also includes:

According to an eleventh aspect, an embodiment of the present application provides a method for receiving a reference signal, including:

Receiving a reference signal on the first resource; the reference signal is sent through a second resource, the second resource includes Z consecutive basic resources, and the basic resource includes Y consecutive third orthogonal frequencies Multiplexed OFDM symbol, and a cyclic prefix CP; wherein the reference signals carried on the Y third OFDM symbols included in one of the basic resources are the same; the third OFDM symbol does not include a CP; the second resource Is a downlink transmission resource (for example, the second resource includes the third OFDM symbol as a downlink OFDM symbol);

In a twelfth aspect, an embodiment of the present application provides a method for receiving a reference signal, including:

Receiving a reference signal on the first resource; the reference signal is sent through a second resource, the second resource includes Z consecutive basic resources, and the basic resource includes Y consecutive third orthogonal frequencies Demultiplexed OFDM symbol and a cyclic suffix CS; wherein the reference signals carried on the Y third OFDM symbols included in one of the basic resources are the same; the third OFDM symbol does not include a CP; and the second resource is Downlink transmission resources (for example, the second resource includes the third OFDM symbol as a downlink OFDM symbol);

In a thirteenth aspect, an embodiment of the present application provides a method for receiving a reference signal, including:

Receiving a reference signal on the first resource; the reference signal is sent through a second resource, the second resource includes Z consecutive basic resources, and the basic resource includes Y consecutive third orthogonal frequencies Demultiplexing OFDM symbols, a cyclic prefix CP, and a cyclic suffix CS; wherein the reference signals carried on the Y third OFDM symbols included in one of the basic resources are the same; the third OFDM symbol does not include a CP; The second resource is a downlink transmission resource (for example, the second resource includes a third OFDM symbol as a downlink OFDM symbol);

In a fourteenth aspect, a device is provided. The apparatus provided by the present application has a function for realizing the behavior of the network device in the above method aspect, and includes means for performing steps or functions corresponding to the method aspect described above. The steps or functions may be implemented by software, or by hardware (such as a circuit), or by a combination of hardware and software.

In a possible design, the above device includes one or more processors and a communication unit. The one or more processors are configured to support the apparatus to perform a corresponding function of the network device in the foregoing method. For example, a reference signal is carried on an OFDM symbol and transmitted. The communication unit is configured to support the device to communicate with other devices to implement receiving and / or transmitting functions. For example, sending a reference signal.

Optionally, the device may further include one or more memories, and the memory is configured to be coupled to the processor, and stores the program instructions and / or data necessary for the device. The one or more memories may be integrated with the processor, or may be separately provided from the processor. This application is not limited.

The communication unit may be a transceiver, or a transceiver circuit. Optionally, the transceiver may be an input / output circuit or an interface.

The device may be a base station, gNB, TRP, or the like, and the communication unit may be a transceiver or a transceiver circuit. Optionally, the transceiver may be an input / output circuit or an interface.

The device may also be a communication chip. The communication unit may be an input / output circuit or an interface of a communication chip.

In another possible design, the device includes a transceiver, a processor, and a memory. The processor is used to control a transceiver or an input / output circuit to send and receive signals, the memory is used to store a computer program, and the processor is used to run the computer program in the memory, so that the device executes any one of the first aspect or the first aspect A method implemented by a network device in a possible implementation manner, or a method implemented by a network device in any of the second aspect or the second aspect may be implemented, or a method implemented in the third aspect or any of the possible implementation methods in the third aspect may be performed The method performed by the network device, or the method performed by the network device in the fourth aspect or any possible implementation manner of the fourth aspect, or the method performed by the network device in the fifth aspect or any possible implementation manner of the fifth aspect Method, or execute the method completed by the network device in the sixth aspect or any possible implementation manner of the sixth aspect, or execute the method completed by the network device in the seventh aspect or any possible implementation manner of the seventh aspect, or execute The eighth aspect or the method performed by the network device in any one of the eighth possible implementation manners, or The person performs the method completed by the network device in the ninth aspect or any possible implementation manner of the ninth aspect, or performs the method completed by the network device in the tenth aspect or any possible implementation manner of the tenth aspect, or performs the tenth implementation. One aspect or the eleventh aspect, the method completed by the network device, or the twelfth aspect, or the method completed by the network device, the tenth aspect, or the tenth aspect. The method implemented by the network device in any of the three aspects or the thirteenth possible implementation manner.

In a fifteenth aspect, a system is provided that includes the at least two network devices described above.

In a sixteenth aspect, a computer-readable storage medium is provided for storing a computer program, the computer program including instructions for performing the first aspect or the method in any possible implementation manner of the first aspect, or including Instructions for performing the second aspect or the method in any one of the possible implementations of the second aspect, or including instructions for performing the third aspect or the method in any of the possible implementations of the third aspect, or including Instructions for performing the fourth aspect or the method in any of the possible implementations of the fourth aspect, or including instructions for performing the method in the fifth aspect or any of the possible implementations of the fifth aspect, or including Instructions for performing the sixth aspect or the method in any one of the possible implementations of the sixth aspect, or including instructions for performing the method in the seventh or any possible implementation of the seventh aspect, or including Instructions for performing the eighth aspect or the method in any one of the eighth aspect implementations, or including for performing the ninth aspect or the ninth aspect An instruction to implement the method in one possible implementation manner, or include an instruction to execute the method in any one of the tenth aspect or the tenth aspect, or include an instruction to perform the eleventh aspect or the eleventh aspect. Any one of the possible implementations of the method, or includes instructions for performing the twelfth aspect or the method of any of the twelfth aspects, or including the execution of the thirteenth aspect or An instruction of the method in any of the thirteenth possible implementation manners.

According to a seventeenth aspect, a computer program product is provided. The computer program product includes: computer program code that, when the computer program code runs on a computer, causes the computer to execute any one of the first aspect or the first aspect. Method in one of the possible implementation manners, or the method in the second aspect or any of the possible implementation methods in the second aspect, or the method in the third aspect or any of the possible implementation methods in the third aspect, or execution The fourth aspect or any one of the possible implementation methods of the fourth aspect, or the fifth aspect or any of the possible implementation methods of the fifth aspect, or the sixth or sixth aspect A method of possible implementation, or a method of performing the seventh aspect or any one of the seven possible implementation methods, or a method of performing an eighth or any of the eighth possible implementation methods, or a ninth aspect Or the method of any possible implementation method of the ninth aspect, or the implementation of the tenth or any possible implementation method of the tenth aspect Method, or the method of implementing the eleventh aspect or any one of the possible implementation methods of the eleventh aspect, or the method of implementing the twelfth aspect or any of the possible implementation methods of the twelfth aspect, or performing the tenth Any of the three ways or the thirteenth way.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural diagram of a communication system according to an embodiment of the present application;

FIG. 2 is a schematic diagram of anisotropic interference provided by an embodiment of the present application; FIG.

3 is another schematic diagram of anisotropic interference provided by an embodiment of the present application;

4 is a schematic diagram of generating an OFDM symbol according to an embodiment of the present application;

FIG. 5 is a schematic diagram of frequency domain correlation detection provided by an embodiment of the present application;

FIG. 6 is a schematic diagram of a damaged cycle characteristic provided by an embodiment of the present application; FIG.

7A is a schematic diagram of a first OFDM symbol according to an embodiment of the present application;

7B is a schematic diagram of a second OFDM symbol according to an embodiment of the present application;

7C is a schematic diagram of two adjacent OFDM symbols that satisfy a cyclic characteristic according to an embodiment of the present application;

FIG. 7D is a schematic diagram of three consecutive OFDM symbols that satisfy a cyclic characteristic according to an embodiment of the present application; FIG.

FIG. 7E is a schematic diagram of another two adjacent OFDM symbols that satisfy a cyclic characteristic according to an embodiment of the present application; FIG.

8 is a schematic diagram of a relationship between RSs carried on different OFDM symbols according to an embodiment of the present application;

FIG. 9A is a time domain schematic diagram of a first basic resource structure carrying a reference signal according to an embodiment of the present application; FIG.

FIG. 9B is a time domain schematic diagram of a second basic resource structure carrying a reference signal according to an embodiment of the present application; FIG.

FIG. 9C is a time domain schematic diagram of a third basic resource structure carrying a reference signal according to an embodiment of the present application; FIG.

FIG. 10 is a schematic diagram showing that a cycle characteristic between basic resources is damaged according to an embodiment of the present application; FIG.

FIG. 11 is a schematic diagram of two adjacent basic resources that satisfy a cyclic characteristic according to an embodiment of the present application; FIG.

FIG. 12 is a schematic diagram of another adjacent basic resource that meets a cyclic characteristic according to an embodiment of the present application; FIG.

13 is a schematic diagram of a time domain and a frequency domain of a reference signal carried by a basic resource according to an embodiment of the present application;

14 is a schematic diagram of a relationship between RSs carried on different basic resources according to an embodiment of the present application;

15 is a flowchart of a method according to an embodiment of the present application;

FIG. 16 is a schematic diagram of a transmission and reception time configuration according to an embodiment of the present application; FIG.

FIG. 17 is a schematic diagram of normal and abnormal transmission of RS according to an embodiment of the present application; FIG.

18 is a schematic diagram of a timing relationship between a reference signal sent by a base station 1 and a reference signal detected by a base station 2 according to an embodiment of the present application;

19 is a flowchart of another method according to an embodiment of the present application;

FIG. 20A is a schematic diagram of a resource location occupied by a reference signal according to an embodiment of the present application; FIG.

FIG. 20B is a schematic diagram of a resource location occupied by another reference signal according to an embodiment of the present application; FIG.

FIG. 20C is a schematic diagram of a resource location corresponding to a reference signal transmission and reception according to an embodiment of the present application; FIG.

21A is a schematic structural diagram of a device according to an embodiment of the present application;

FIG. 21B is a schematic structural diagram of a network device according to an embodiment of the present application; FIG.

FIG. 22 is a schematic structural diagram of a communication device according to an embodiment of the present application.

detailed description

The embodiments of the present application can be applied to, but not limited to, 5G systems, such as NR systems, and can also be applied to LTE systems, long-term evolution-advanced (LTE-A) systems, and enhanced long-term evolution technologies. -Advanced (eLTE) and other communication systems can also be extended to related cellular systems such as wireless fidelity (WiFi), worldwide microwave interoperability (microwave access), and 3GPP. Specifically, as shown in FIG. 1, the communication system architecture applied in the embodiment of the present application may include at least two network devices, namely, network device 1 and network device 2. Network device 1 serves terminal device 1 and network device 2 serves.于 terminal 设备 2。 On the terminal device 2. The network device 1 and the network device 2 may be network devices that are located far apart from each other. It should be noted that the number of terminal devices and network devices in the communication system shown in FIG. 1 is not limited in the embodiments of the present application.

In the following, some terms in this application are explained so as to facilitate understanding by those skilled in the art.

1) A network device is a device that connects a terminal to a wireless network in a communication system. The network device is a node in a radio access network, and may also be called a base station, and may also be called a radio access network (RAN) node (or device). In the following description, a base station is taken as an example for illustration. At present, some examples of network equipment are: gNB, transmission reception point (TRP), evolved Node B (eNB), radio network controller (RNC), and node B (Node B, NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home NodeB, or home NodeB, HNB), baseband unit , BBU), or wireless fidelity (Wifi) access point (access point, AP), etc. In addition, in a network structure, the network device may include a centralized unit (CU) node and a distributed unit (DU) node. This structure separates the protocol layer of the eNB in a long term evolution (LTE) system. Some protocol layer functions are centrally controlled by the CU. The remaining part or all of the protocol layer functions are distributed in the DU. Centralized control of DU.

2) Terminal, also known as terminal equipment, user equipment (UE), mobile station (MS), mobile terminal (MT), etc., is a way to provide voice and / or data to users Connected devices, such as handheld devices with wireless connectivity, in-vehicle devices, etc. At present, some examples of terminals are: mobile phones, tablet computers, laptops, PDAs, mobile internet devices (MID), wearable devices, virtual reality (VR) devices, augmented reality (augmented reality) equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, and smart grids Wireless terminals, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, and the like.

3) Anisotropic interference (CLI):

The CLI between base stations mainly refers to that a downlink (DL) signal sent by one base station interferes with an uplink (UL) signal of another base station. The uplink signal may be, for example, a signal sent by the UE to the base station. As shown in FIG. 2, the left and right cells belonging to two base stations work in the same frequency band, the left cell belongs to the first base station, and the right base station belongs to the second base station. In the cell on the left, the first base station is sending a DL signal to UE1, while in the cell on the right, the second base station is receiving the UL signal sent by UE2, but the DL signal sent by the first base station can also be received by the second base station. Therefore, the downlink signal of the left cell interferes with the reception of the right cell.

The CLI between base stations usually occurs when two TDD cells operating on the same frequency have different transmission directions. Therefore, if the TDD cell keeps the transmission direction the same, the CLI is usually not generated. However, there are exceptions: even if two base stations that are far apart in geographical location are transmitting in the same direction (that is, receiving uplink / sending downlink signals at the same time), due to the remote geographical location between them, one base station sends When a downlink signal arrives at another base station after a significant delay, the other base station has switched from the downlink transmission direction to the uplink reception direction. At this time, a CLI will also be generated, as shown in Figure 3: The downlink signal sent by base station 1 reaches base station 2. At this time, a delay occurs, and at this time, the base station 2 is receiving an uplink signal, thereby generating a CLI.

4) Cyclic shift:

The so-called cyclic shift means that the bits in the original range before the shift are not lost during the shift, but they are used as the complement bits at the other end. For example, taking the cyclic left shift as an example, the sequence A = 123456, and the sequence B after cyclic shifting the sequence A by two bits are: B = 345612. Taking cyclic right shift as an example, the sequence C after two-bit cyclic shift of sequence A is: C = 561234. That is, if the sequence x (n), n = 0,1,2, ..., N-1 is rotated left by K bits to obtain the sequence y (n), then x (n) and y (n) satisfy y (n) = x (n + K) _N , n = 0,1,2, ..., N-1, where x (n) _N represents the periodic extension of x (n). Without loss of generality, for sequences with sequential significance, "left" can mean "earlier / earlier", and "right" can mean "later / later"; for example, the sequence A = 123456, because "1" is to the left of "2", so "1" precedes "2".

5) Orthogonal frequency division system:

Orthogonal frequency division multiplexing (OFDM) communication system belongs to a multi-carrier system. In the frequency domain, one OFDM symbol occupies multiple orthogonal subcarriers. In the time domain, an OFDM symbol includes multiple samples (also referred to as sampling points); the signal carried by an OFDM symbol is a signal obtained by superimposing N orthogonal subcarrier signals. An OFDM symbol is usually generated by carrying the signal to be transmitted in the frequency domain, and then converted into the time domain by inverse Fourier transform. The OFDM symbol converted into the time domain also needs to add a cyclic prefix (CP). That is, a number of sampling points at the end are added to the head end as a CP to form an OFDM symbol containing the CP, as shown in FIG. 4. One square in the frequency domain sequence in FIG. 4 represents one or more subcarriers, and one square in the time domain sequence represents one or more samples.

In order to counteract the existence of CLIs between base stations at extremely long distances, inter-base station measurements need to be performed first, and in NR, there is currently no standardized reference signal for NR base station and channel condition measurement, and there is no standardized related measurement process.

The applicant has found that, in order to perform ultra-long distance measurement between base stations, the problem of uncertain arrival time between reference signals (RS) needs to be considered. This is because the distance between the base stations where the ultra-long-distance interference occurs is indefinite, so that the time from the RS sent from the base station 1 to the base station 2 is also uncertain. Due to the uncertainty of RS delay, a base station can only detect the reference signal by blind detection. If the correlation detection is performed in the time domain, the time-domain sliding correlation window detection needs to be performed on each sampling point, and the convolution calculation is required for each sampling point position, and the calculation overhead is very large. Correlation detection in the frequency domain can obtain correlation calculation results corresponding to multiple sampling points at one time through "Fourier transform-frequency domain point multiplication-inverse Fourier transform", so the complexity of frequency domain correlation detection is low. Therefore, it is more advantageous to use frequency-domain correlation detection for measurements between base stations. In the frequency domain correlation detection, it is necessary to ensure that in a detection window, at least one complete sample to be detected can be observed in the time domain, and the observed sample to be detected may be a sample to be detected after cyclic shift. Therefore, if the frequency domain correlation detection method is used to detect the reference signal, it should be ensured that the reference signal has a cyclic shift feature, that is, the reference signal may include several repeated parts, each part is the same, and each part is equivalent to one A complete sample to be tested. From a mathematical point of view, for a loop sequence x (n) of total length N, it should satisfy x (n) = x (n + K), where n = 0,1,2, ..., NK-1 Time is true, K is a constant related to the cycle characteristics, such as the length of each part. When at least one of at least these repeated portions is detected in the detection window, it can be determined that the reference signal is detected.

For example, the length of the detection window is one OFDM symbol, and the length of the repeated part included in the reference signal is also one OFDM symbol. Then, the reference signals carried in the consecutive OFDM symbols are required to be the same. As shown in FIG. 5, the base station 2 performs frequency-domain correlation detection on the RS sent by the base station 1. According to the characteristics of frequency-domain correlation detection, the RSs transmitted by the base station 1 and carried in consecutive OFDM symbols are the same, and the cyclic characteristics are guaranteed. As an example in FIG. 5, it is assumed that the detection window length is 1 OFDM symbol, and RS occupies 2 consecutive OFDM symbols.

In order to realize that the detection window includes at least one complete RS, a possible design is to make the RSs carried by two consecutive OFDM symbols before and after the same.

However, carrying the same RS directly on the two OFDM symbols before and after will cause the cyclic feature to be destroyed due to the addition of the respective CP on each OFDM symbol. For example, referring to FIG. 6, different stuffed symbols represent the first OFDM symbol and the second OFDM symbol, and the two OFDM symbols before and after each carry the same RS, that is, 12345678 in the time domain. However, after adding CP to each OFDM symbol, the RS sent is in the form of "78-12345678-78-12345678", which is cyclic only within one OFDM symbol (that is, the form of 78-12345678), but it The OFDM symbols are not cyclic, and the cyclic characteristics between the two OFDM symbols need to be guaranteed to be in the form "12345678-12345678". Because the cyclic characteristics are destroyed, the receiver cannot effectively perform blind detection through frequency-domain correlation methods.

Based on this, embodiments of the present application provide a method and a device for sending and receiving a reference signal, which are used to solve the problem that channel measurement cannot be performed between two long-distance base stations in the prior art. Among them, the method and the device are based on the same inventive concept. Since the principle of the method and the device for solving the problem is similar, the implementation of the device and the method can be referred to each other, and duplicated details will not be repeated.

The base station 1 on the transmitting end may bear the reference signal on multiple symbols and send it to the base station 2 on the receiving end. For example, the base station 1 may bear the reference signal on M consecutive OFDM symbols for transmission.

The continuity mentioned here refers to the continuity in the time domain. In addition, on the one hand, the OFDM symbols involved in the embodiments of the present application may be OFDM symbols to which a CP is added, and on the other hand, the OFDM symbols may also be OFDM symbols to which a cyclic suffix (CS) is added.

The following describes the relationship between the reference signals carried by M consecutive OFDM symbols in the time domain and the frequency domain, respectively.

First, taking the OFDM symbol of CP as an example, the description will be made in the time domain:

In the time domain, among M consecutive OFDM signals, the reference signal of the first OFDM symbol excluding the CP is the same as the reference signal of the second OFDM symbol excluding the CP and the W cyclic shift is the same signal. . The first OFDM symbol and the second OFDM symbol are any two OFDM symbols among the M consecutive OFDM symbols.

If the first OFDM symbol is later than the second OFDM symbol in the time domain, the cyclic shift is a cyclic left shift. W may be based on the CP length of the OFDM symbol spaced between the first OFDM symbol and the second OFDM symbol and the first OFDM symbol. The CP length is ok.

If the first OFDM symbol is earlier than the second OFDM symbol in the time domain and the cyclic shift is a cyclic right shift, W may be based on the CP length of the OFDM symbol spaced between the first OFDM symbol and the second OFDM symbol and the second OFDM symbol. The CP length of the OFDM symbol is determined.

In a possible example, the first OFDM symbol and the second OFDM symbol are two adjacent OFDM symbols in the time domain, then the two adjacent OFDM symbols are in the time domain and the next OFDM symbol The reference signal partially removed from the CP is the same as the signal obtained by performing a cyclic shift (cyclic left shift) on the reference signal except the CP carried on the previous OFDM symbol. The length of the cyclic shift is the CP length of the OFDM symbol. definite.

Exemplarily, the CP length of the OFDM symbol is the CP length of the next OFDM symbol of the two adjacent OFDM symbols.

Wherein, the latter and the former refer to the time before and after.

If the CP lengths from the second OFDM symbol to the Mth OFDM symbol are the same in M OFDM symbols, for example, they are all L, the length of the cyclic shift of the reference signal carried by the CP excluding the CP on the previous OFDM symbol Is L, that is, the signal obtained by cyclically shifting (cyclically shifting left) the reference signal excluding the CP carried on the previous OFDM symbol is the same as the reference signal excluding the CP carried on the subsequent OFDM symbol.

In another possible example, among M consecutive OFDM symbols, the reference signal carried by the u-th OFDM symbol excluding the CP and the reference signal carried by the v-th OFDM symbol excluding the CP are (uv) · L The signals obtained by long cyclic shift are the same, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, and L is the CP length of the OFDM symbol. For example, when v = 1, the reference signal of the u-th OFDM symbol excluding the CP and the reference signal of the first OFDM symbol excluding the CP undergo a (u-1) · L-length cyclic shift (cyclic left The signal obtained by the shift) is the same, and the CP lengths of the 2nd to Mth OFDM symbols are all L.

In another possible example, among the M consecutive OFDM symbols, the reference signal carried by the u-th OFDM symbol excluding the CP and the reference signal carried by the v-th OFDM symbol excluding the CP are performed

The signals obtained by the long cyclic shift are the same, Ln is the CP length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, and v is an integer greater than or equal to 1 and less than u. For example, when v = 1, the reference signal carried by the u-th OFDM symbol with the CP removed and the reference signal carried by the first OFDM symbol with the CP removed

A long cyclic shift (cyclic left shift) results in the same signal.

The following uses the OFDM symbol of CS as an example to explain in the time domain:

In terms of time domain, among M consecutive OFDM signals, the reference signal partially borne by CS except the first OFDM symbol is the same as the reference signal obtained by cyclically shifting the reference signal without partial CS on the second OFDM symbol. . The first OFDM symbol and the second OFDM symbol are any two OFDM symbols among the M consecutive OFDM symbols.

If the first OFDM symbol is later than the second OFDM symbol in the time domain, the cyclic shift is a cyclic left shift. W may be based on the CS length of the OFDM symbol spaced between the first OFDM symbol and the second OFDM symbol and the second OFDM. The CS length of the symbol is determined.

If the first OFDM symbol is earlier than the second OFDM symbol in the time domain and the cyclic shift is a cyclic right shift, W may be based on the CS length of the OFDM symbol spaced between the first OFDM symbol and the second OFDM symbol and the first OFDM symbol. The CS length of OFDM is determined.

In a possible example, the first OFDM symbol and the second OFDM symbol are two adjacent OFDM symbols in the time domain, then the two adjacent OFDM symbols are in the time domain and the next OFDM symbol The reference signal with the CS partially removed is the same as the signal obtained by performing a cyclic shift (cyclic left shift) on the reference signal without the CS partially carried on the previous OFDM symbol, and the length of the cyclic shift is the CS length of the OFDM symbol definite.

Exemplarily, the CS length of the OFDM symbol is the CS length of a previous OFDM symbol among the two adjacent OFDM symbols.

If the CS lengths from the first OFDM symbol to the M-1th OFDM symbol are the same in M OFDM symbols, for example, they are all L, then the reference signal carried by the part of the previous OFDM symbol excluding CS is cyclically shifted. The length is L, that is, the signal obtained by cyclically shifting (cyclically shifting to the left) the reference signal borne by CS on the previous OFDM symbol is the same as the reference signal borne by the CS signal on the next OFDM symbol.

In another possible example, among the M consecutive OFDM symbols, the reference signal carried by the u-th OFDM symbol excluding the CS and the reference signal carried by the v-th OFDM symbol excluding the CS are (uv) · L The signals obtained by the long cyclic shift are the same, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, and L is the CS length of the OFDM symbol. For example, when v = 1, the reference signal of the u-th OFDM symbol with CS removed and the reference signal of the first OFDM symbol with CS removed are subjected to (u-1) · L long cyclic shift (cyclic left The signal obtained by the shift) is the same, and the CS lengths of the 2nd to Mth OFDM symbols are all L.

In another possible example, among the M consecutive OFDM symbols, the reference signal carried by the u-th OFDM symbol excluding the CS and the reference signal carried by the v-th OFDM symbol excluding the CS are performed

The signals obtained by the long cyclic shift are the same, Ln is the CS length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, and v is an integer greater than or equal to 1 and less than u. For example, when v = 1, the reference signal of the u-th OFDM symbol with CS removed and the reference signal of the first OFDM symbol with CS removed

A long cyclic shift (cyclic left shift) results in the same signal.

In the following, taking M OFDM symbols including CP, the first OFDM symbol and the second OFDM symbol as an example, it is described that any two OFDM symbols can achieve cyclic characteristics by cyclic shift.

For example, the first OFDM symbol is x ₁ (n), and the length is N when CP is not included. After adding L CP, it will be at n = 0,1,2, ..., L-1. The N-point cyclic shift characteristic is satisfied within the range, that is, the condition shown in formula (1) is satisfied:

x ₁ (n) = x ₁ (n + N), n = 0, 1, 2, ..., L-1 (1)

Referring to FIG. 7A, N = 8 is taken as an example.

The second OFDM symbol is x ₂ (m) and the length is N when CP is not included. After adding L CP, it will be in the range of m = 0,1,2, ..., L-1 Meet the characteristics of N-point cyclic shift, that is, meet the conditions shown in formula (2):

x ₂ (m) = x ₂ (m + N), m = 0, 1, 2, ..., L-1 (2)

Referring to FIG. 7B, N = 8 is taken as an example.

By connecting the first OFDM symbol (including CP) with the second OFDM symbol (including CP) in the time domain, and the second OFDM symbol is after the first OFDM symbol, we can get n = N + L, N + L + 1, N + L + 2, ..., 2N + 2L-1 x ₁ (n) and m = 0,1,2, ..., N + L-1 x ₂ (m) Relationship, which satisfies the condition shown in formula (3):

x ₁ (n) = x ₂ (nNL), n = N + L, N + L + 1, N + L + 2, ..., 2N + 2L-1 (3)

Within the first OFDM symbol and the second OFDM symbol, the condition that x ₁ (n) satisfies the cyclic characteristics of N points is shown in formula (4):

x ₁ (n) = x ₁ (n + N), n = 0, 1, 2, ..., L-1, L, L + 1, L + 2, ..., N + 2L-1 (4)

In formula (4), the value range of n is n = 0,1,2, ..., L-1, L, L + 1, L + 2, ..., N + 2L-1. Combining formula (3) and formula (4), we can get formula (5):

x ₂ (n) = x ₁ (n + N + L) = x ₁ (n + L), n = 0, 1, 2, ..., N + L-1 (5)

Equation (5) reflects the relationship between x ₁ (n) and x ₂ (n). But further, considering that x ₁ (n) and x ₂ (n) are actually defined as N-long sequences, and L is the number of points to add CP, it is also necessary to obtain a domain of n = 0,1,2, ... The relationship between x ₁ (n) and x ₂ (n) in the range of N-1 (or n = L, L + 1,... L + N-1, which are equivalent). Further, combining formula (1), formula (2), and formula (5), formula (6) can be obtained:

It can be seen from formula (6) that the sequence obtained by connecting x ₁ (n) and x ₂ (n) still meets the conditions of the cyclic characteristics of N points: the sequence obtained by cyclic shift of x ₂ (n) and x ₁ (n) is the same.

Exemplarily, as shown in FIG. 7C, after x ₁ (n) and x ₂ (n) are connected, in order to ensure that the sequence as a whole still satisfies N points (N = 8 in FIG. 7C as an example), the cycle characteristics, x ₂ ( "12345678" of n) needs to be equal to "34567812" of x ₁ (n), which is equivalent to the sequence obtained by cyclic shift of the part of x ₂ (n) that does not include CP and x ₁ (n) does not include CP The parts are the same (L = 2 is taken as an example in FIG. 7C).

The above conclusion can also be extended to the case where the reference signal is mapped to multiple symbols, as shown in FIG. 7D. Take three symbols as an example: when x ₁ (n), x ₂ (n), and x ₃ (n) are connected Later, in order to ensure that the sequence as a whole still satisfies N points (N = 8 is taken as an example in FIG. 7D), the cycle characteristic of "12345678" of x ₂ (n) needs to be equal to "34567812" of x ₁ (n), which is equivalent to x ₂ ( n) The sequence obtained by cyclic shift of L points is the same as x ₁ (n) (L = 2 is taken as an example in FIG. 7D); “12345678” of x ₃ (n) needs to be equal to “34567812” of x ₂ (n) , Which is equivalent to the sequence obtained by cyclic shifting the part of x ₃ (n) that does not include CP, and the part of x ₂ (n) that does not include CP, and the "12345678" of x ₃ (n) is also equal to x The "56781234" of ₁ (n) is equivalent to the sequence obtained by cyclic shifting the 2L point of the part not including the CP in x ₃ (n) and the part not including the CP in x ₁ (n).

As an example, as shown in FIG. 7E, the two reference signal sequences with CS added are x ₄ (n) and x ₅ (n), and x ₄ (n) is "1234567812". If x ₄ (n) and x _{After 5} (n) are connected, in order to ensure that the entire sequence satisfies the N-point cyclic characteristic, N is the length of two reference signal sequences without adding CS, and x ₅ (n) should be "3456781234".

The following description is made in the frequency domain:

In the frequency domain, among the M consecutive OFDM symbols, the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol are The phase difference between the phases is determined by the index of the first subcarrier, wherein the first OFDM symbol and the second OFDM symbol are any two OFDM symbols among the M consecutive OFDM symbols, and M is greater than Or an integer equal to 2. It should be noted that an OFDM symbol occupies multiple subcarriers in the frequency domain, and the number of subcarriers occupied is related to the system bandwidth. The first subcarrier is an OFDM symbol occupying any one of a plurality of subcarriers in the frequency domain.

For OFDM multi-carrier systems such as NR and LTE, it is possible to carry not only the RS but also the data sent to the UE on one OFDM symbol, that is, for the base station 1, the RS and The data sent to the UE it serves is carried on different subcarriers of the same OFDM symbol. If the second OFDM symbol is cyclically shifted in the time domain directly, it may cause problems such as inaccurate estimation of the downlink channel of the terminal device, and inability to correctly receive and demodulate data on the cyclically shifted OFDM symbol. Therefore, the frequency domain adjustment method provided in the embodiment of the present application does not affect the reception of data on the premise that RSs of M OFDM symbols can be correctly detected.

The cyclic shift of the OFDM signal in the time domain will appear as the phase shift of the corresponding frequency domain signal in the frequency domain (that is, the phase difference between the reference signals carried by the two OFDM symbols on the same subcarrier). The phase offset between reference signals carried on the same subcarrier of several OFDM symbols is determined according to the index of the subcarrier. For a complex number Ae ^iθ , i represents

θ is its phase. Complex phase usually considers its value in the range of 0 to 2π, that is, the value of θ mode 2π (θmod 2π), because for complex numbers, phase θ and phase (θ + 2π) are equivalent. The phase offset (phase difference value) is proportional to the change amount of the subcarrier k, that is, the phase difference value has a linear characteristic with the change of the index k of the subcarrier, that is, a linear relationship between the phase difference value and the index k of the subcarrier .

The linear relationship between the phase difference value w of the reference signal carried by the two OFDM symbols on the subcarrier k and the subcarrier index k is expressed as a linear function relationship between the phase difference values w and k, such as w = Ak + C, where A and C are constants independent of k. Exemplarily, among the M consecutive OFDM symbols, the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol The phase difference between them is w1, the phase between the phase of the reference signal carried on the second subcarrier of the first OFDM symbol and the phase of the reference signal carried on the second subcarrier of the second OFDM symbol The difference is w2, and the phase difference between the phase of the reference signal carried on the third subcarrier of the first OFDM symbol and the phase of the reference signal carried on the third subcarrier of the second OFDM symbol is w3 , The phase difference between the phase of the reference signal carried on the fourth subcarrier of the first OFDM symbol and the phase of the reference signal carried on the fourth subcarrier of the second OFDM symbol is w4; The difference between the index of the two subcarriers and the index of the first subcarrier is equal to the difference between the index of the fourth subcarrier and the index of the third subcarrier, then the value of (w2-w1) modulo 2π is equal to (w4-w3) modulo The value of 2π.

In a feasible implementation manner, for an OFDM symbol including a CP, a phase of a reference signal carried on a first subcarrier of a first OFDM symbol and a reference carried on a first subcarrier of a second OFDM symbol The phase difference between the phases of the signal is also determined by the symbol length of the OFDM symbol and / or the cyclic prefix CP length of the OFDM symbol.

For OFDM symbols containing CS, the phase difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol is also Determined by the symbol length of the OFDM symbol and / or the CS length of the OFDM symbol.

Exemplarily, taking an OFDM symbol including a CP as an example, the first OFDM symbol is separated from the second OFDM symbol by X OFDM symbols. The first OFDM symbol is earlier than the second OFDM symbol in the time domain. X is an integer greater than or equal to 0; the CP length of the OFDM symbol is determined by the CP length of the X OFDM symbols and the CP length of the second OFDM symbol. For example, the first OFDM symbol is adjacent to the second OFDM symbol, and the CP length of the OFDM symbol is the CP length of the second OFDM symbol. For example, if the first OFDM symbol and the second OFDM symbol are separated by two OFDM symbols, the CP length of the OFDM symbol is determined according to the CP length of the spaced two OFDM symbols and the CP length of the second OFDM symbol. One feasible method is that the phase difference is determined by the sum of the CP length of the spaced 2 OFDM symbols and the CP length of the second OFDM symbol.

In another feasible implementation manner, for an OFDM symbol including a CP, among the M consecutive OFDM symbols, any two adjacent OFDM symbols are carried on a first subcarrier of a subsequent OFDM symbol The phase difference between the phase of the reference signal and the phase of the reference signal carried on the first subcarrier of the previous OFDM symbol is 2πLk / N, where N is the symbol length of the OFDM symbol and L is the CP of the OFDM symbol Length, k is an index of the first subcarrier. Exemplarily, L is the CP length of the latter OFDM symbol. However, the length N does not include the part of the CP.

For OFDM symbols containing CS, among the M consecutive OFDM symbols, any two adjacent OFDM symbols are carried on the phase of the reference signal on the first subcarrier of the latter OFDM symbol and on the previous one. The phase difference between the phases of the reference signals on the first subcarrier of the OFDM symbol is 2πLk / N, where N is the symbol length of the OFDM symbol, L is the CS length of the OFDM symbol, and k is the first subcarrier index of. Exemplarily, L is the CS length of the previous OFDM symbol. The length N does not include the CS part.

In another feasible implementation manner, for an OFDM symbol including a CP, among the M consecutive OFDM symbols, the phase of the reference signal carried on the first subcarrier of the u-th OFDM symbol and the The phase difference between the phases of the reference signals on the first subcarrier of the vth OFDM symbol is

For OFDM symbols containing CS, among the M consecutive OFDM symbols, the phase of the reference signal carried on the first subcarrier of the uth OFDM symbol and the first subcarrier carried on the vth OFDM symbol The phase difference between the phases of the reference signals is

Where N is the symbol length of the OFDM symbol, Ln is the CS length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, and k Is the index of the first subcarrier.

Exemplarily, taking an OFDM symbol including a CP as an example, if v = 1, the phase of the reference signal carried on the first subcarrier of the uth OFDM symbol and the first subcarrier carried on the first OFDM symbol The phase difference between the phases of the reference signals is

Exemplarily, in the M consecutive OFDM symbols, the CP lengths of the 2nd to Mth OFDM symbols are equal and all are L, and the reference signal is carried on the first subcarrier of the uth OFDM symbol. And the phase difference between the phase of the reference signal carried on the first subcarrier of the vth OFDM symbol is

Exemplarily, in the M consecutive OFDM symbols, the CP lengths of the 2nd to Mth OFDM symbols are equal and all are L, and the reference signal is carried on the first subcarrier of the uth OFDM symbol. And the phase difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol is

That is, 2π (u-1) Lk / N.

According to the nature of the OFDM system, the cyclic shift of the OFDM signal in the time domain will appear as the phase shift of the corresponding frequency domain signal in the frequency domain (that is, between two reference signals carried on the same subcarrier by two OFDM symbols Phase difference), the phase offset is determined according to the index of the subcarrier, in other words, the cyclic shift of an OFDM signal in the time domain will appear in the frequency domain as the corresponding frequency domain signal point times a phase Sequence, the phase sequence is a linear phase sequence having a linear relationship with the subcarrier index k. Taking the OFDM symbol containing CP as an example, the corresponding derivation is as follows:

Let y (n) be the L-point cyclic shift sequence of x (n) sequence, then y (n) satisfies the formula (7):

y (n) = x (n + L) _N R _N (n) (7)

Among them, x (n + L) _N represents the cyclic extension sequence of x (n) sequence after L point shift, and R _N (n) represents the window function of length N, so that y (n) and x ( n) The sequences obtained by cyclic shift of L points are the same. Let X [k] denote the frequency domain signal of x (n) after being expanded by Fourier transform in the frequency domain, as shown in formula (8):

Equation (8) is the principle of OFDM system, i is

The value of k ranges from k = 0,1,2, ... N-1. For example, Y [k] represents the frequency domain signal after y (n) is expanded by Fourier transform in the frequency domain, as shown in formula (9):

Remembering n + L = n ', then formula (9) can be further transformed into formula (10):

Since x (n ') _N is a periodic sequence, the integral (that is, the sum) of x (n') _N over the interval [L, L + 1, ..., N + L-1] and x (n ') The integral of _N in the interval [0,1, ..., N-1] is the same, so we have:

Therefore, it can be seen from the above formula (11) that the phase difference between the reference signals carried by the two OFDM symbols on the subcarrier index k is determined by the subcarrier k, and is also determined by the symbol length N (that is, the Fourier transform) of the OFDM symbol. Of points) and L correlation. For a cyclic shift between two adjacent OFDM negative signs caused by a CP, the length L of the cyclic shift is the CP length of the OFDM symbol. In addition, the phase difference between the reference signals carried by the two OFDM symbols on the subcarrier index k is

It increases linearly with the index k of the subcarrier. The phase difference can also be regarded as a straight line that varies with k, and the slope of the straight line is 2πL / N.

That is, if an RS signal is carried on each OFDM symbol among a plurality of consecutive OFDM symbols, and the RS carried on the k-th subcarrier of the first OFDM symbol is S (k), then for the second OFDM symbol The RS carried on subcarrier k should be S (k) times a complex compensation amount. The phase of the complex compensation amount is

That is, the complex compensation amount is

For the 3rd, 4th, ... Mth OFDM symbols, the phase of the complex compensation amount to be multiplied by the RS carried on the subcarrier k on the mth OFDM symbol is

Ln is the CP length corresponding to the nth OFDM symbol; if the CP length corresponding to the Mth OFDM symbol from the second OFDM symbol is L, the RS carried on the subcarrier k on the mth OFDM symbol needs The phase of the multiplied complex compensation is

That is, the phase of the phase compensation amount corresponding to the reference signal carried on the subcarrier k from the 2nd OFDM symbol to the Mth OFDM symbol is

Therefore, for the base station transmitting the reference signal, linear phase compensation can be performed on the reference signals carried on different OFDM symbols in the frequency domain to achieve the effect equivalent to the time-domain cyclic shift; the base station transmitting the reference signal sends the The reference signal, so that the base station receiving the reference signal can detect the reference signal in a frequency-domain correlation manner. The transmitting base station may first generate a reference signal carried on one OFDM symbol, and then generate a reference signal carried in other OFDM symbols based on the relationship between the reference signals of different OFDM symbols in the time domain / frequency domain described in the embodiments of the present application. Alternatively, the transmitting base station may directly generate reference signals carried on multiple OFDM symbols according to the relationship of the reference signals between different OFDM symbols in the time / frequency domain described in the embodiments of the present application, or The reference signal is generated by other methods, which is not limited in this application.

Exemplarily, an OFDM symbol occupies 8 subcarriers is taken as an example. As shown in FIG. 8, RSs carried on the 8 subcarriers of the first OFDM are S (0), S (1), and S (2), respectively. ..., S (7). According to the solution provided in the embodiment of the present application, the RSs carried on the 8 subcarriers of the second OFDM symbol are S (0) * exp (i * 0 * 2πL / N) and S (1) * exp (i * 1 * 2πL / N), S (2) * exp (i * 2 * 2πL / N), ..., S (7) * exp (i * 7 * 2πL / N), 8 subcarriers of the third OFDM symbol The RS carried on the network are S (0) * exp (i * 2 * 0 * 2πL / N), S (1) * exp (i * 2 * 1 * 2πL / N), and S (2) * exp (i * 2 * 2 * 2πL / N), ..., S (7) * exp (i * 2 * 7 * 2πL / N). Among them, exp (x) represents e ^x .

It should be noted that the above is based on the previous OFDM symbol. "The RS of the next OFDM symbol is multiplied by one in the frequency domain.

Linear phase ", but it can also be based on the next OFDM symbol, and" the RS of the previous OFDM symbol in the frequency domain multiplied by one

Linear phase ", the essence of the two is the same, that is, the phase difference between the RS on the subcarrier index k on two adjacent OFDM symbols is

In the embodiment of the present application, the solution provided by the embodiment of the present application is described from the perspective of the symbol carrying the reference signal. As described in the previous embodiments, the following is from the perspective of the basic resource composed of multiple OFDM symbols carrying the reference signal. description. The base station 1 on the transmitting end may bear the reference signal on multiple basic resources and send it to the base station 2 on the receiving end.

In the embodiment of the present application, the resources used to carry RSs measured between base stations include one or more basic resources, and each basic resource includes Y consecutive third OFDM symbols in the time domain (the third OFDM symbol does not include CP or CS), Y is an integer greater than or equal to 2; each third OFDM symbol in one basic resource carries the same RS. The time domain length of one basic resource is equal to the length of Y fourth OFDM symbols including the CP. The fourth OFDM symbol in the embodiment of the present application represents an OFDM symbol including CP and / or CS. The third OFDM symbol is an OFDM symbol excluding CP and CS.

Exemplarily, the third OFDM symbol has the same symbol length as the fourth OFDM symbol, that is, the third OFDM symbol has the same length as the fourth OFDM symbol excluding CP and / or CS.

It should be understood that the OFDM symbols not explicitly described in the embodiments of the present application refer to OFDM symbols including CP and / or CS.

Optionally, for convenience of expression, the RS carried by a third OFDM symbol in the time domain may be referred to as an RS time domain sequence.

Each basic resource may include one CP and / or one CS. Therefore, the basic resources may be divided into the following three structures.

The first basic resource structure: the basic resource includes only CPs, and the CP of the basic resources is at the forefront of the basic resources, and the CP length of the basic resources is equal to the sum of the CP lengths of the Y fourth OFDM symbols. For example, referring to FIG. 9A, in FIG. 9A, a time domain length of a basic resource is equal to two fourth OFDM symbols. One basic resource includes two third OFDM symbols and a CP.

The second basic resource structure: the basic resource includes only CS, then the CS of the basic resource is at the end of the basic resource, and the length of the CS of the basic resource is equal to the sum of the CP lengths of the Y fourth OFDM symbols. For example, referring to FIG. 9B, in FIG. 9B, the time domain length of the basic resource is equal to two fourth OFDM symbols. One basic resource includes two third OFDM symbols and one CS.

The third basic resource structure: the basic resource includes a CP and a CS, the CS of the basic resource is at the end of the basic resource, and the CP of the basic resource is at the front of the basic resource. For example, refer to FIG. 9C. In FIG. 9C, the time domain length of the basic resource is equal to two fourth OFDM symbols. A basic resource includes two third OFDM symbols and a CP and a CS.

Since the RS time domain sequence carried by each third OFDM symbol in a basic resource is the same, the RS in one basic resource meets the cyclic characteristics in the time domain; however, in consecutive Z basic resources, even if the RS sequence is carried, Similarly, because the CP and / or CS in each basic resource are added separately, the overall cycle characteristics are destroyed. For example, taking a basic resource structure as an example, as shown in FIG. 10, each basic resource includes multiple RS sequences and a CP, and each basic resource includes the same RS sequence, that is, "12345678" in the time domain. ". After adding the CP to each basic resource, the RS sent is "5678-12345678-12345678", which is cyclic in one basic resource, but the RS "5678-12345678-12345678-5678-12345678-" in the two basic resources. "12345678" is not circular. The cyclic characteristics in the two basic resources need to be guaranteed to have the form "12345678-12345678-12345678-12345678". Because the cycle characteristic between the two basic resources is destroyed, when the RS between the two basic resources is observed by the detection window of the receiving end, the blind detection cannot be effectively performed by the frequency domain correlation method.

Based on this, the solution provided by the embodiments of the present application can solve the problem that the circulation characteristics between multiple basic resources are destroyed.

The base station 1 on the transmitting end may bear the reference signal on multiple basic resources and send it to the base station 2 on the receiving end. For example, the base station 1 carries the reference signal on Z consecutive basic resources to send. The continuity mentioned here refers to the continuity in the time domain. In addition, on the one hand, the fourth OFDM symbol involved in the embodiment of the present application may be an OFDM symbol to which a CP is added, and on the other hand, the fourth OFDM symbol may also be an OFDM symbol to which a cyclic suffix (CS) is added.

The following describes the relationship between the reference signals carried by the Z consecutive basic resources respectively in the time domain and the frequency domain.

First, take the structure of the first basic resource as an example, that is, only the basic resources of the CP are described in the time domain:

From the time domain perspective, among the Z consecutive basic resources, the reference signal included in the first basic resource is the same as the signal obtained by performing a W-length cyclic shift on the reference signal included in the second basic resource. The first basic resource and the second basic resource are any two basic resources among the Z consecutive basic resources.

It should be understood that a feasible understanding is that the reference signal carried by the basic resource in the embodiments of the present application refers to the reference signal carried by the symbol part included in the basic resource, that is, carried by the Y third OFDM symbols included in the basic resource. In another feasible understanding, in the embodiments of the present application, the reference signal carried by the basic resource refers to the reference signal carried by any one of the third OFDM symbols of the Y third OFDM symbols included in the basic resource.

If the first basic resource is later than the second basic resource in the time domain, the cyclic shift is a cyclic left shift. W may be based on the CP length of the basic resource spaced between the first basic resource and the second basic resource and the CP of the first basic resource. The length is ok.

If the first basic resource is earlier than the second basic resource in the time domain, the cyclic shift is a cyclic right shift. W may be based on the CP length of the basic resource spaced between the first basic resource and the second basic resource and the CP of the second basic resource. To determine the length.

In a possible example, the first basic resource and the second basic resource are two adjacent basic resources in the time domain, then the two adjacent basic resources are in the time domain and the latter basic resource carries The reference signal is the same as the signal obtained by performing a cyclic shift (cyclic left shift) on the reference signal carried by the previous basic resource, and the length of the cyclic shift is determined by the CP length of the basic resource.

Exemplarily, the CP length of the basic resource is the CP length of the latter basic resource of the two adjacent basic resources.

Wherein, the latter and the former refer to the time before and after.

If the CP lengths of the Z basic resources from the second basic resource to the Zth basic resource are the same, for example, they are all L, the length of the cyclic shift of the reference signal carried by the previous basic resource is L, that is, the previous The signal obtained by cyclically shifting (cyclically shifting left) the reference signal carried by one basic resource is the same as the reference signal carried by the latter basic resource.

In another possible example, among Z consecutive basic resources, a signal obtained by performing a (uv) · L long cyclic shift on a reference signal carried by the u-th basic resource and a reference signal carried by the v-th basic resource Similarly, u is an integer greater than 1 and less than or equal to Z, v is an integer greater than or equal to 1 and less than u, and L is the CP length of the basic resource. For example, when v = 1, the reference signal carried by the u-th basic resource and the reference signal carried by the first basic resource are subjected to the (u-1) · L long cyclic shift (cyclic left shift). The CP lengths of the 2nd to Zth basic resources are all L.

In another possible example, among the Z consecutive basic resources, the reference signal carried by the u-th basic resource is performed with the reference signal carried by the v-th basic resource.

The signals obtained by the long cyclic shift are the same, Ln is the CP length of the nth basic resource, u is an integer greater than 1 and less than or equal to Z, and v is an integer greater than or equal to 1 and less than u. For example, when v = 1, the reference signal carried by the u-th basic resource is performed with the reference signal carried by the first basic resource.

A long cyclic shift (cyclic left shift) results in the same signal.

Exemplarily, referring to FIG. 11, taking Z = 2, Y = 2, and L = 4 as an example, the second basic resource is later than the first basic resource when the first basic resource is connected to the second basic resource. Later, in order to ensure that the entire sequence still meets the cyclic characteristics, the RS time domain sequence of the second basic resource needs to be L = 4 cyclic shift equal to the RS time domain sequence of the first basic resource "12345678", that is, "56781234" . Through cyclic shifting, the entirety of the RS included in the first basic resource and the second basic resource satisfies the cyclic characteristic in the time domain.

The above conclusion can also be extended to the case where the reference signal is mapped to multiple basic resources. The application principle of the solution of this application is the same as above, and is not repeated here.

Secondly, taking the structure of the second basic resource as an example, which includes only the basic resources of the CS, the description will be made in the time domain:

If the first basic resource is later than the second basic resource in the time domain and the cyclic shift is a cyclic left shift, W may be determined according to the CS length of the second basic resource and the CS length of the interval between the first basic resource and the second basic resource.

If the first basic resource is earlier than the second basic resource in the time domain and the cyclic shift is a cyclic right shift, W may be based on the CS length of the first basic resource and the CS of the basic resource separated by the first basic resource and the second basic resource. To determine the length.

In a possible example, the first basic resource and the second basic resource are two adjacent basic resources in the time domain, then the two adjacent basic resources are in the time domain and the latter basic resource carries The reference signal is the same as the signal obtained by performing a cyclic shift (cyclic left shift) on the reference signal carried by the previous basic resource, and the length of the cyclic shift is determined by the CS length of the basic resource.

Exemplarily, the CS length of the basic resource is the CS length of the previous basic resource among the two adjacent basic resources.

Wherein, the latter and the former refer to the time before and after.

If the CS lengths of the Z basic resources from the first basic resource to the Z-1th basic resource are the same, such as J, the length of the cyclic shift of the reference signal carried by the previous basic resource is J. That is, the signal obtained by cyclic shifting (cyclically shifting left) the reference signal carried by the previous basic resource is the same as the reference signal carried by the next basic resource.

In another possible example, among the Z consecutive basic resources, a reference signal carried by the u-th basic resource and a reference signal carried by the v-th basic resource are subjected to a cyclic shift of (uv) · J length Similarly, u is an integer greater than 1 and less than or equal to Z, v is an integer greater than or equal to 1 and less than u, and J is the CS length of the basic resource. For example, when v = 1, the reference signal carried by the u-th basic resource and the reference signal carried by the first basic resource are subjected to the (u-1) · J-length cyclic shift (cyclic left shift). The CS lengths of the 1st to Z-1th basic resources are all J.

The signals obtained by the long cyclic shift are the same, Jn is the CS length of the nth basic resource, u is an integer greater than 1 and less than or equal to Z, and v is an integer greater than or equal to 1 and less than u. For example, when v = 1, the reference signal carried by the u-th basic resource is performed with the reference signal carried by the first basic resource.

A long cyclic shift (cyclic left shift) results in the same signal.

Again, the structure of the third basic resource is taken as an example, that is, the basic resource including CP and CS is taken as an example to explain in the time domain:

If the first basic resource is later than the second basic resource in the time domain, the cyclic shift is a cyclic left shift. W may be based on the CS length of the second basic resource, and the CP of the basic resource spaced between the first and second basic resources. The length and CS length and the CP length of the first basic resource are determined.

If the first basic resource is earlier than the second basic resource in the time domain, the cyclic shift is a cyclic right shift. W may be based on the CS length of the first basic resource, and the CP of the basic resource spaced between the first and second basic resources. The length and the CS length and the CP length of the second basic resource are determined.

In a possible example, the first basic resource and the second basic resource are two adjacent basic resources in the time domain, then the two adjacent basic resources are in the time domain and the latter basic resource carries The reference signal is the same as the signal obtained by performing a cyclic shift (cyclic left shift) on the reference signal carried by the previous basic resource, and the length of the cyclic shift is determined by the CP length and CS length of the basic resource.

Exemplarily, the CP length of the basic resource is the CP length of the last basic resource among the two adjacent basic resources, and the CS length of the basic resource is the previous one of the two adjacent basic resources. CS length of the basic resource.

Wherein, the latter and the former refer to the time before and after.

If the CP lengths from the second basic resource to the Zth basic resource are the same, for example, they are all L, and the CS length from the first basic resource to the Z-1th basic resource is the same. For example, if both are J, the length of the cyclic shift of the reference signal carried by the previous basic resource is L + J, that is, the signal obtained by cyclic shifting (cyclic left shift) of the reference signal carried by the previous basic resource by L + J bits. It is the same as the reference signal carried by the latter basic resource.

In another possible example, among the Z consecutive basic resources, the reference signal carried by the u-th basic resource and the reference signal carried by the v-th basic resource undergo a (uv) · (L + J) long cyclic shift The signals obtained by bits are the same, u is an integer greater than 1 and less than or equal to Z, v is an integer greater than or equal to 1 and less than u, L is the CP length of the basic resource, and L is the CS length of the basic resource. For example, when v = 1, the reference signal carried by the u-th basic resource and the reference signal carried by the first basic resource are obtained by performing a (u-1) · (L + J) long cyclic shift (cyclic left shift). The signals are the same, and the CP lengths of the 2nd to Zth basic resources are all L, and the CS lengths of the 1st to Z-1th basic resources are J.

The signal obtained by a long cyclic shift is the same, Ln is the CP length of the nth basic resource, Jn is the CS length of the nth basic resource, u is an integer greater than 1 and less than or equal to Z, and v is greater than or equal to 1 And an integer less than u. For example, when v = 1, the reference signal carried by the u-th basic resource is performed with the reference signal carried by the first basic resource.

A long cyclic shift (cyclic left shift) results in the same signal.

Exemplarily, referring to FIG. 12, taking Z = 2, Y = 2, L = 2, and J = 2 as examples, the second basic resource is later than the first basic resource, and when the first basic resource and the first After the two basic resources are connected, in order to ensure that the entire sequence still meets the cyclic characteristics, the RS time domain sequence of the second basic resource needs to be equal to the L + J = 4 point cyclic shift of the RS time domain sequence "12345678" of the first basic resource. Bit, which is "56781234". Through cyclic shifting, the entirety of the RS included in the first basic resource and the second basic resource satisfies the cyclic characteristic in the time domain.

The application has been described in the time domain above, and in the frequency domain:

From the frequency domain perspective, in Z consecutive basic resources, the phase of the reference signal carried on the first subcarrier of the first basic resource and the phase of the reference signal carried on the first subcarrier of the second basic resource The phase difference between them is determined by the index of the first subcarrier, wherein the first basic resource and the second basic resource are any two basic resources among the Z consecutive basic resources, and Z is greater than or An integer equal to 2. It should be noted that one basic resource includes multiple third OFDM symbols. One third OFDM symbol occupies multiple subcarriers in the frequency domain. The number of subcarriers occupied is related to the system bandwidth. The first subcarrier is a third OFDM symbol occupying any one of a plurality of subcarriers in the frequency domain.

First, the structure of the first basic resource is taken as an example, that is, the basic resource includes a CP and does not include a CS. FIG. 13 shows a time domain and a frequency domain diagram of a reference signal carried by a basic resource. Exemplarily, Y = 2. The RS frequency domain sequence is carried on the subcarrier. For example, S (k) represents the RS carried on the subcarrier k, and k = 0, 1,..., 7. Because the reference signals carried on multiple third OFDM symbols included in a basic resource are the same, the reference signal on subcarrier k of a basic resource can be considered to be on the subcarrier k of any one of the OFDM symbols in the basic resource. Reference signal.

In a feasible implementation manner, for a basic resource including a CP, the phase of the reference signal carried on the first subcarrier of the first basic resource and the reference of the first subcarrier carried on the second basic resource The phase difference between the phases of the signals is also determined by the symbol length of the third OFDM symbol and / or the cyclic prefix CP length of the basic resource.

Exemplarily, taking a basic resource including a CP as an example, the first basic resource is separated from the second basic resource by X basic resources, and the first basic resource is earlier than the second basic resource in the time domain. X is an integer greater than or equal to 0; the CP length of the basic resource is determined by the CP length of the X basic resources and the CP length of the second basic resource. For example, the first basic resource is adjacent to the second basic resource, and the CP length of the basic resource is the CP length of the second basic resource. For example, if the first basic resource and the second basic resource are separated by two basic resources, the CP length of the basic resource is determined according to the CP length of the spaced two basic resources and the CP length of the second basic resource. Among them, a feasible method is that the phase difference is determined by the sum of the CP length of the spaced 2 basic resources and the CP length of the second basic resource.

In another feasible implementation manner, for the basic resources including the CP, any two adjacent basic resources among the Z consecutive basic resources are carried on the first subcarrier of the latter basic resource. The phase difference between the phase of the reference signal and the phase of the reference signal carried on the first subcarrier of the previous basic resource is 2πLk / N, where N is the symbol length of the third OFDM symbol and L is the basic resource CP length, k is an index of the first subcarrier. Exemplarily, L is the CP length of the latter basic resource.

In another feasible implementation manner, for a basic resource including a CP, among the Z consecutive basic resources, the phase of the reference signal carried on the first subcarrier of the u-th basic resource and the The phase difference between the phases of the reference signals on the first subcarrier of the v-th basic resource is

Exemplarily, a basic resource including a CP is taken as an example. Among the Z consecutive basic resources, the CP lengths of the second to the Z-th basic resources are the same and all are L, and are carried on the u-th basic resource. The phase difference between the phase of the reference signal on the first subcarrier and the phase of the reference signal on the first subcarrier carried on the first basic resource is

That is, 2π (u-1) Lk / N, k is an index of the first subcarrier, and N is a symbol length of the third OFDM symbol.

Exemplarily, a basic resource includes two third OFDM symbols, and each third OFDM symbol occupies eight subcarriers. For example, as shown in FIG. The RSs carried are S (0), S (1), S (2), ..., S (7). Through the solution provided in the embodiment of the present application, the RSs carried on the 8 subcarriers of the third OFDM symbol of the second basic resource are S (0) * exp (i * 0 * 2πL / N) and S (1), respectively. * exp (i * 1 * 2πL / N), S (2) * exp (i * 2 * 2πL / N), ..., S (7) * exp (i * 7 * 2πL / N), the third basic The RSs carried on the 8 subcarriers of the resource's OFDM symbols are S (0) * exp (i * 2 * 0 * 2πL / N), S (1) * exp (i * 2 * 1 * 2πL / N), S (2) * exp (i * 2 * 2 * 2πL / N), ..., S (7) * exp (i * 2 * 7 * 2πL / N). Among them, exp (x) represents e ^x .

Second, take the structure of the second basic resource as an example, that is, the basic resource includes CS.

For basic resources including CS, the phase difference between the phase of the reference signal carried on the first subcarrier of the first basic resource and the phase of the reference signal carried on the first subcarrier of the second basic resource is also Determined by the symbol length of the third OFDM symbol and / or the CS length of the basic resource.

For basic resources including CS, among the Z consecutive basic resources, any two adjacent basic resources, the phase of the reference signal carried on the first subcarrier of the latter basic resource and the former are carried on the previous one. The phase difference between the phases of the reference signals on the first subcarrier of the basic resource is 2πLk / N, where N is the symbol length of the third OFDM symbol, L is the CS length of the basic resource, and k is the first The index of the subcarrier. Exemplarily, L is the CS length of the previous basic resource.

For basic resources including CS, among the Z consecutive basic resources, the phase of the reference signal carried on the first subcarrier of the u-th basic resource and the first subcarrier carried on the v-th basic resource The phase difference between the phases of the reference signals is

Where N is the symbol length of the third OFDM symbol, Ln is the CS length of the nth basic resource, u is an integer greater than 1 and less than or equal to Z, and v is an integer greater than or equal to 1 and less than u K is an index of the first subcarrier.

Second, take the structure of the third basic resource as an example, that is, the basic resource includes CS and CP.

For basic resources including CP and CS, the phase between the phase of the reference signal carried on the first subcarrier of the first basic resource and the phase of the reference signal carried on the first subcarrier of the second basic resource The difference is also determined by the symbol length of the third OFDM symbol and / or the CP length of the basic resource and the CS length. For basic resources including CP and CS, out of the Z consecutive basic resources, any two adjacent basic resources carry the phase of the reference signal on the first subcarrier of the latter basic resource and carry the The phase difference between the phases of the reference signals on the first subcarrier of the previous basic resource is 2π (L + J) k / N, where N is the symbol length of the third OFDM symbol, and L is the CP of the basic resource Length, J is the CS length of the basic resource, and k is the index of the first subcarrier. Exemplarily, L is the CP length of the last basic resource, and J is the CS length of the previous basic resource.

For basic resources including CP and CS, among the Z consecutive basic resources, the phase of the reference signal carried on the first subcarrier of the u-th basic resource and the first phase of the reference signal carried on the v-th basic resource The phase difference between the phases of the reference signals on the subcarriers is

Exemplarily, a basic resource including CP and CS is taken as an example. Among the Z consecutive basic resources, the CP lengths of the second to the Z-th basic resources are equal and are all L, and the first to the Z-th basic resources are the same. The CS lengths of the -1 basic resources are equal, and all are J, then the phase of the reference signal carried on the first subcarrier of the uth basic resource and the reference carried on the first subcarrier of the first basic resource The phase difference between the phases of the signal is

That is, 2π (u-1) (L + J) k / N, where k is the index of the first subcarrier, and N is the length of the third OFDM symbol excluding CP or CS.

It should be noted that the above is based on the previous basic resource. "The RS of the next basic resource is multiplied by one in the frequency domain.

Linear phase ", but it can also be based on the latter basic resource, and" the RS of the previous basic resource is multiplied by one in the frequency domain.

Linear phase ", the essence of the two is the same, that is, the phase difference between RSs on the subcarriers with index k in two adjacent basic resources is

It should be understood that, because the length of the third OFDM symbol is the same as the length of the portion of the fourth OFDM symbol excluding the CP of the fourth OFDM symbol, in the above, the phase difference of the reference signal on the first subcarrier of different basic resources It can be determined not only according to the length of the third OFDM symbol, but also according to the length of the fourth OFDM symbol. For example, if the length of the third OFDM symbol is N, the length of the fourth OFDM symbol is Ncp, and the CP length of the fourth OFDM symbol is Lcp, then N = Ncp−Lcp.

For the principle that the cyclic shift of the basic resource in the time domain appears in the frequency domain as the linear phase offset of the corresponding frequency domain signal (that is, the linear relationship between the phase difference value and the index k of the subcarrier), It has been introduced above, so I won't repeat it here.

For the base station sending the reference signal, linear phase compensation can be performed on the reference signals carried on different basic resources in the frequency domain to achieve the effect equivalent to the time-domain cyclic shift; the base station sending the reference signal sends the reference signal , So that the base station receiving the reference signal can detect the reference signal in a frequency-domain correlation manner. The sending base station may first generate a reference signal carried on one basic resource, and then generate a reference signal carried on other basic resources according to the relationship between the reference signals of different basic resources in the time domain / frequency domain described in the embodiments of the present application. Alternatively, the transmitting base station may directly generate reference signals carried on multiple basic resources according to the relationship of the reference signals between different basic resources in the time / frequency domain described in the embodiments of the present application, or The reference signal is generated by other methods, which is not limited in this application.

In addition, in the embodiment of the present application, the RS used for measurement between base stations may not occupy all subcarriers of one OFDM symbol in the frequency domain. For example, the total number of subcarriers of an OFDM symbol is N, and RS may only occupy M subcarriers, and M≤N. However, the phase difference between two OFDM symbols on the same subcarrier is related to the length N of one OFDM symbol. Generally, the number of time domain samples of an OFDM symbol is the same as the total number of subcarriers, so the phase difference can also be considered to be related to the total number of subcarriers N of an OFDM symbol.

Generally, the frequency domain resources occupied by the RSs on the two OFDM symbols before and after or on the two RSs on the basic resource are the same frequency domain resources, that is, they are carried on the same subcarrier. If the number of subcarriers carrying the reference signal is less than the number of subcarriers of the OFDM symbol, other subcarriers may carry other signals, such as data signals between the base station and the user equipment. If other signals carried in different OFDM symbols are not the same, the time domain signal superimposed on the time domain by all subcarriers of the OFDM symbol may not meet the cyclic characteristics, but only the subcarriers carrying the reference signal are superimposed on the time domain. The time-domain signal still meets the cyclic characteristics, so the reference signal can still be detected by means of blind detection.

The embodiments of the present application are also applicable to a case where the RSs on the two OFDM symbols before and after or the RSs on the basic resources occupy different frequency domain resources. For example, referring to FIG. 8, the first OFDM symbol occupies the first subcarrier-the fourth carrier, and the second OFDM symbol occupies the fifth subcarrier-the eighth subcarrier. As another example, referring to FIG. 8, the first OFDM symbol occupies the first sub-carrier to the sixth carrier, and the second OFDM symbol occupies the third sub-carrier to the eighth sub-carrier.

The embodiment of the present application does not limit the specific sequence of measuring RS. For example, the RS may be a pseudo-random sequence based on a Gold sequence and QPSK modulation, or a low peak to average power ratio (PAPR) sequence based on a ZadOff-Chu (ZC) sequence. In particular, if the RS is a ZC sequence or a low peak-to-average ratio sequence based on the ZC sequence, due to the characteristics of the sequence, the RS point multiplies the linear phase

It is also equivalent to the L point cyclic shift of RS. For example, if an RS signal is carried on each of the M consecutive OFDM symbols, the CP length of the 2nd to Mth OFDM symbols is L, and it is carried on the kth subcarrier of the first OFDM symbol. RS is S (k), then the RS carried on subcarrier k of the m-th OFDM symbol is S (k + (m-1) * L), that is, S (k + (m-1) * L) and

equal.

If the distance between the base station 1 and the base station 2 is relatively long, the base station 1 transmits on the downlink symbol. Due to the delay, the base station 2 may need to receive on the guard interval and / or the uplink OFDM symbol.

See Figure 15:

S901. The base station 1 sends a reference signal to the base station 2 on the second resource. The second resource is a downlink transmission resource.

The first way is that the second resource includes M consecutive downlink OFDM symbols. The M consecutive downlink OFDM symbols satisfy the above-mentioned relationship in the time domain and / or the frequency domain, and details are not described herein again.

In a second manner, the second resource includes Z consecutive basic resources; the Z consecutive basic resources satisfy the above-mentioned relationship in the time domain and / or the frequency domain, and details are not described herein again. The OFDM symbols included in the basic resources are downlink OFDM symbols.

S902. The base station 2 determines a first resource for receiving a reference signal, where the first resource includes an uplink OFDM symbol and / or a guard interval.

S903. The base station 2 receives a reference signal on the first resource.

Optionally, for the first manner, before S901, the base station 1 generates a sequence corresponding to the reference signal.

The sequence corresponding to the reference signal may be a sequence mapped to one OFDM symbol or a basic resource, based on the time domain and / or frequency domain relationship between different OFDM symbols or different basic resources described in the embodiments of the present application. , So that sequences on other OFDM symbols or sequences on other basic resources can be generated.

It is also possible to directly generate a sequence mapped to M OFDM symbols or Z basic resources according to the time domain and / or frequency domain relationship between different OFDM symbols or basic resources described in the embodiments of the present application.

For the second resource described in the first manner, the base station 1 sending the reference signal to the base station 2 on the second resource includes:

The base station 1 maps a sequence corresponding to the reference channel to a resource element (resource element, RE) (k, l) of M consecutive OFDM symbols. k represents a subcarrier index, and l represents an OFDM symbol index.

Exemplarily, the reference signal sequence a (k, l) carried on RE (k, l) satisfies the condition shown in formula (12):

Where j is

l _start is an index of the lth OFDM symbol among the M OFDM symbols carrying RS,

Represents the length of the CP corresponding to the lth OFDM symbol,

Represents the bandwidth of the system, that is, the total number of subcarriers in an OFDM symbol. There is a certain correspondence between k and k ', for example, k' = m * k + k _offset , where m and k _offset are predefined or configurable values. Exemplarily, m = 1 and k _offset = 0, in which case k ′ = k.

For the second resource described in the second manner, the base station 1 sending the reference signal to the base station 2 on the second resource includes:

The base station 1 maps the sequence corresponding to the reference channel to the resource particle (k, l ') of each third OFDM symbol in the Z consecutive basic resources. k indicates a subcarrier index, and l 'indicates a basic resource index.

Exemplarily, the reference signal sequence a (k, l ') carried on RE (k, l') satisfies the condition shown in formula (13):

Where j is

l ′ _start is an index of the l′ th basic resource among Z basics carrying RS,

Represents the length of the CP corresponding to the l'th basic resource,

In a feasible implementation manner, the base station 1 and the base station 2 participating in the measurement may use the same sending and receiving time configuration. The sending and receiving time configuration information includes at least one of the following: uplink-downlink switching period, latest downlink transmission time, and earliest uplink reception time. The base station 2 may determine the sending and receiving time configuration according to the sending and receiving time configuration information, and determine the start time of the blind detection RS.

The time domain position of the reference signal sent between the base stations can also use the same time domain position. When the base station 2 receives and blindly detects an RS, the interference range can be determined according to the fixed time domain position, so that the interference needs to be determined. The range of resources to be eliminated, and the distance from the interference source (base station 1) to the own station can be calculated more conveniently, which is helpful for locating the interference source base station. See Figure 16.

In the embodiment of the present application, the M OFDM symbols carrying the RS may occupy the last M symbols of the downlink transmission time, or the Z basic resources carrying the RS may occupy the last Z basic resources of the downlink transmission time. Taking M OFDM symbols carrying RS as the last M symbols of downlink transmission time as an example, on the one hand, the maximum range of interference can be determined, because RS is already the last M symbols of downlink transmission, so after the base station 2 detects the RS , It can be determined that the range after the time domain position where the RS is located is not affected by the anisotropic interference of the base station 1, so that interference cancellation methods can be further applied, such as lower order modulation, lower code rate, etc. for the area affected by the CLI On the other hand, the success rate of detection can be guaranteed to the greatest extent. As shown in Figure 17, if the RS is not in the last M symbols of the DL part, it is possible that the RS is still in the DL area after the delay, resulting in the interference station being unable to RS is detected. In this case, the DL part of the interference source base station 1 still generates anisotropic interference to the UL part of the interfered base station 2.

Based on this, optionally, before sending the reference signal to the base station 2 on the second resource at S901, the base station 1 further includes:

S904. The base station 1 and / or the base station 2 receive transmission and reception time configuration information.

The sending and receiving time configuration information may be notified by the base station 1 to the receiving base station 2, or may be notified by the base station 2 to the receiving base station 1. Or, the sending and receiving time configuration information may be configured by the high-level control node to the base station 1 and / or the base station 2 , Or configured by the engineer in base station 1 and / or base station 2 during network deployment. When the base station 2 receives the reference signal on the first resource, the base station 2 may locally generate RS1, use the local RS1 and the received reference signal to perform frequency-domain cross-correlation operation, and then perform inverse Fourier transform on the result of the frequency-domain cross-correlation. Leaf transformation, transforming to the time domain to obtain the correlation peak; when the correlation peak exceeds a certain threshold value, the base station 2 may determine that the reference signal RS1 sent from the base station 1 is received.

As an example, as shown in FIG. 18, the downlink OFDM symbol used by the base station 1 to send RS1, because the distance between the base station 1 and the base station 2 is relatively long, resulting in a time delay, so the base station 1 detects a reference signal on the uplink OFDM.

In addition, the execution time of step S903 in the above steps can be earlier than step S901. Because base station 1 and base station 2 are far away, and the tropospheric bending effect affects the signal propagation, base station 2 is not sure when the reference signal from base station 1 will arrive Therefore, the base station 2 can detect whether RS1 exists on all symbols that may receive the reference signal, and at this time, step S903 may be performed earlier than step S901. But although the base station 2 can start detection as early as possible, the base station 2 can detect the RS1 sent by the base station 1 only after the RS1 of the base station 1 reaches the base station 2.

The design manner of the reference signal between the base stations at a relatively long distance provided in the embodiments of the present application can also be applied to a measurement scenario between neighboring base stations (closer base stations). In the measurement scenarios of neighboring base stations, the delay due to geographical distance can be ignored. For example, base station 1 and base station 3 are two adjacent base stations, and the time when the base station 1 sends the reference signal can be considered as the time when the base station 3 receives the reference signal.

See Figure 19:

S1301. The base station 1 sends a reference signal on the second resource. The second resource is a downlink transmission resource.

The second resource includes M consecutive downlink OFDM symbols, or the second resource includes a guard time interval (GP). Alternatively, the second resource includes Z consecutive basic resources. The OFDM symbols included in the basic resources are downlink OFDM symbols.

Exemplarily, the reference signals carried by M consecutive OFDM symbols or Z consecutive basic resources satisfy the above-mentioned relationship in the time domain and / or the frequency domain, and details are not described herein again.

S1302. The base station 3 determines a first resource for receiving a reference signal according to the obtained first information. The first information includes time-frequency resource location information used to carry the reference signal. That is, the first information includes a time domain resource and / or a frequency domain resource location of the second resource.

The first information may be notified by the base station 1 to the receiving base station 3, or may be configured by the high-level control node to the base station 3, or configured by the engineer in the base station 3 during network deployment.

S1303. The base station 3 receives the reference signal on the first resource.

In a possible implementation manner, the base station 3 may also obtain second information, where the second information includes the reference signal, or parameter information required for generating the reference signal; thus, determining the Receiving the reference signal on the first resource, or performing channel estimation according to the second information and the received reference signal.

The first information and the second information may be included in the same configuration information and sent by the base station 1 to the base station 3, or may be configured by the high-level control node to the base station 3, or configured by the engineer in the base station 3 during network deployment. . The first information and the second information may also be included in different configuration information. The base station 1 sends the same information or different messages to the base station 3, and the high-level control node may configure the base station 3 through the same message or different messages.

Exemplarily, parameter information required for generating the reference signal may be, for example, an initial phase of a Gold sequence, a root sequence of a ZC sequence, and the like. The base station 3 may receive the reference signal (as a local reference signal), or locally generate the same reference signal as the reference signal sent by the base station 1 (the generated reference signal is used as a local reference signal). On the one hand, by cross-correlating the local reference signal with the received signal, it can be detected whether the transmitting base station has sent an RS. On the other hand, the base station 3 can perform channel estimation by using the local reference signal and the received signal (including the RS sent by the base station 1).

For example, referring to FIG. 20A, the base station 1 sends a reference signal in the GP, and the base station 3 receives the reference signal in the GP.

In FIG. 20A, the DL symbol and the UL symbol are for the terminal device, and the terminal device usually does not transmit and receive in the GP; therefore, when measuring between base stations, RS transmission and reception can be performed within the GP range. At this time, The RS does not interfere with the data sent by the terminal equipment and the data that the UE needs to receive.

As another example, referring to FIG. 20B, the base station 1 sends a reference signal while occupying M downlink OFDM symbols, and the base station 3 receives the reference signal in the GP. Therefore, it can be ensured that the RS transmitted from the base station 1 does not interfere with the uplink part of the base station 3.

In the embodiment of the present application, the ultra-long-distance interference measurement and the adjacent base station interference measurement may be multiplexed with the same RS, as shown in FIG. 20C. Base station 1 sends the same RS to base station 2 and base station 3 for both ultra-long distance measurements and measurements between neighboring base stations; for base station 3, since it is a neighboring station, it can be determined that The transmission time determines the reception time, and it is not necessary to perform "blind" detection in all GP and / or UL areas; for measurements between

base stations

1 and 3, it is necessary to perform "blind" detection in the UL area. The reference signals carried between the channels satisfy the related description of the relationship in the time domain and / or the frequency domain, and are not repeated here.

The communication device according to the embodiment of the present application will be described in detail below with reference to FIGS. 21A, 21B, and 22.

Based on the same inventive concept as the foregoing method embodiment, referring to FIG. 21A, a schematic structural diagram of a device provided by an embodiment of the present application may include a transceiver unit 1510 and a processing unit 1520.

In a possible implementation manner, the device may be applied to a base station on the sender side, and the transceiver unit 1510 may be configured to send a reference signal to the base station on the receiver side, or receive transmission time configuration information sent by a high-level control node. Exemplarily, the transceiver unit 1510 executes step S901 or S1301. The processing unit 1520 may be configured to generate a reference signal and the like. The specific processing unit 1510 may be configured to implement a function performed by the base station 1 in the embodiment corresponding to FIG. 15 or FIG. 19.

In a possible implementation manner, the device may be used for a receiver's base station, a transceiver unit 1510, receiving a reference signal sent by the receiver's base station, or receiving transmission time configuration information sent by a high-level control node, or receiving first information, Second information and so on. Exemplarily, the transceiver unit 1510 may be configured to perform step S903 or step 1303. The processing unit 1520 may be configured to determine a resource for receiving a reference signal, or determine an interference base station according to the received reference signal, or perform channel estimation. For example, the processing unit 1520 is configured to perform step S902 or step S1302. The specific processing unit 1510 may be configured to implement the functions performed by the base station 2 in the foregoing embodiments corresponding to FIG. 15 or FIG. 19.

FIG. 21B is a schematic structural diagram of a network device according to an embodiment of the present application. For example, it may be a structural schematic diagram of a base station. As shown in FIG. 21B, the base station can be applied to the system shown in FIG. 1 to perform the functions of the network device (or base station) in the foregoing method embodiment. The base station 150 may include one or more radio frequency units, such as a remote radio unit (RRU) 1501 and one or more baseband units (BBU) (also referred to as a digital unit, DU). 1502. The RRU 1501 may be referred to as a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., and may include at least one antenna 15011 and a radio frequency unit 15012. The RRU 1501 part is mainly used for transmitting and receiving radio frequency signals and converting radio frequency signals and baseband signals, for example, for sending a reference signal described in the foregoing embodiment to a terminal device. The BBU 1502 is mainly used for baseband processing and controlling base stations. The RRU 1501 and the BBU 1502 may be physically located together or physically separated, that is, a distributed base station.

The BBU 1502 is a control center of a base station, and may also be referred to as a processing unit, which is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, spread spectrum, and so on. For example, the BBU (Processing Unit) 1502 may be used to control a base station to execute an operation procedure on a network device (or a base station) in the foregoing method embodiment.

In one example, the BBU 1502 may be composed of one or more boards, and multiple boards may jointly support a single access indication wireless access network (such as an LTE network or a 5G network), or may separately support different Access standard wireless access network (such as LTE network, 5G network or other networks). The BBU 1502 further includes a memory 15021 and a processor 15022. The memory 15021 is configured to store necessary instructions and data. The processor 15022 is configured to control the base station to perform necessary actions, for example, it is used to control the base station to perform an operation procedure on a network device (or a base station) in the foregoing method embodiment. The memory 15021 and the processor 15022 may serve one or more single boards. That is, the memory and processor can be set separately on each board. It is also possible that multiple boards share the same memory and processor. In addition, the necessary circuits can be set on each board.

FIG. 22 is a schematic structural diagram of a communication device 1600. The device 1600 may be configured to implement the method described in the foregoing method embodiment, and reference may be made to the description in the foregoing method embodiment. The communication device 1600 may be a chip, a network device (such as a base station), and the like.

The communication device 1600 includes one or more processors 1601. The processor 1601 may be a general-purpose processor or a special-purpose processor. For example, it may be a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, and the central processing unit can be used to control communication devices (such as base stations, terminals, or chips, etc.), execute software programs, and process software program data. The communication device may include a transceiving unit for implementing input (reception) and output (transmission) of signals. For example, the communication device may be a chip, and the transceiver unit may be an input and / or output circuit of the chip, or a communication interface. The chip may be used in a terminal or a base station or other network equipment. As another example, the communication device may be a base station or a network device, and the transceiver unit may be a transceiver, a radio frequency chip, or the like.

The communication device 1600 includes one or more of the processors 1601. The one or more processors 1601 may implement the base station (base station 1, base station 2, or base station 3) in the embodiment shown in FIG. 15 or FIG. 19. Method of implementation.

In a possible design, the communication device 1600 includes means for generating a reference signal, and means for transmitting the reference signal. The functions of generating the means of the reference signal and transmitting the means of the reference signal may be implemented by one or more processors. For example, the reference signal may be generated by one or more processors, and the reference signal may be sent through an interface of a transceiver, or an input / output circuit, or a chip. For the reference signal, refer to related descriptions in the foregoing method embodiments.

In a possible design, the communication device 1600 includes means for receiving a reference signal. The reference signal may be received through a transceiver, or an input / output circuit, or an interface of a chip, for example.

Optionally, in addition to implementing the method shown in FIG. 15 or FIG. 19, the processor 1601 may also implement other functions.

Optionally, in a design, the processor 1601 may execute instructions, so that the communication device 1600 executes the method described in the foregoing method embodiment. The instructions may be stored in whole or in part in the processor, such as instruction 1603, or may be stored in whole or in part in a memory 1602 coupled to the processor, such as instruction 1604, or may be made by

instructions

1603 and 1604 together. The communication device 1600 executes the method described in the above method embodiment.

In yet another possible design, the communication device 1600 may also include a circuit that can implement the functions of the network device (or base station) in the foregoing method embodiments.

In yet another possible design, the communication device 1600 may include one or more memories 1602 on which instructions 1604 are stored, and the instructions may be executed on the processor, so that the communication device 1600 executes The method described in the above method embodiment. Optionally, the memory may further store data. Instructions and / or data can also be stored in the optional processor. For example, the one or more memories 1602 may store the corresponding relationships described in the foregoing embodiments, or related parameters or tables involved in the foregoing embodiments. The processor and the memory may be provided separately or integrated together.

In another possible design, the communication device 1600 may further include a transceiver unit 1605 and an antenna 1606. The processor 1601 may be referred to as a processing unit and controls a communication device (a terminal or a base station). The transceiver unit 1605 may be referred to as a transceiver, a transceiver circuit, or a transceiver, and is used to implement a transceiver function of the communication device through the antenna 1606.

The present application also provides a communication system including the foregoing multiple network devices (or base stations). It may also include one or more terminal devices.

It should be noted that the processor in the embodiment of the present application may be an integrated circuit chip and has a signal processing capability. In the implementation process, each step of the foregoing method embodiment may be completed by using an integrated logic circuit of hardware in a processor or an instruction in a form of software. The above processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable Programming logic devices, discrete gate or transistor logic devices, discrete hardware components. Various methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. A general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in combination with the embodiments of the present application may be directly implemented by a hardware decoding processor, or may be performed by using a combination of hardware and software modules in the decoding processor. The software module may be located in a mature storage medium such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, and the like. The storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the foregoing method in combination with its hardware.

It can be understood that the memory in the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrical memory Erase programmable read-only memory (EPROM, EEPROM) or flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (synchlink DRAM, SLDRAM ) And direct memory bus random access memory (direct RAMbus RAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

An embodiment of the present application further provides a computer-readable medium having a computer program stored thereon. When the computer program is executed by a computer, the communication method according to any one of the foregoing method embodiments is implemented.

The embodiment of the present application further provides a computer program product, and when the computer program product is executed by a computer, the communication method according to any one of the method embodiments is implemented.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the processes or functions according to the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, a computer, a server, or a data center. Transmission by wire (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) to another website site, computer, server, or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, and the like that includes one or more available medium integration. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a high-density digital video disc (DVD)), or a semiconductor medium (for example, a solid state disk (solid state disk, SSD)) and so on.

An embodiment of the present application further provides a processing apparatus including a processor and an interface; the processor is configured to execute the communication method according to any one of the foregoing method embodiments.

It should be understood that the processing device may be a chip, and the processor may be implemented by hardware or software. When implemented by hardware, the processor may be a logic circuit, an integrated circuit, etc .; when implemented by software At this time, the processor may be a general-purpose processor, which is implemented by reading software codes stored in a memory, and the memory may be integrated in the processor, may be located outside the processor, and exist independently.

It should be understood that “an embodiment” or “an embodiment” mentioned throughout the specification means that a particular feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present application. Thus, the appearances of "in one embodiment" or "in an embodiment" appearing throughout the specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in the various embodiments of the present application, the size of the sequence numbers of the above processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not deal with the embodiments of the present application. The implementation process constitutes any limitation.

In addition, the terms "system" and "network" are often used interchangeably herein. The term "and / or" in this document is only a kind of association relationship describing related objects, which means that there can be three kinds of relationships, for example, A and / or B can mean: A exists alone, A and B exist simultaneously, and exists alone B these three cases. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

It should be understood that in the embodiment of the present application, “B corresponding to A” means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B based on A does not mean determining B based on A alone, but also determining B based on A and / or other information.

Those of ordinary skill in the art may realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the hardware and software, Interchangeability. In the above description, the composition and steps of each example have been described generally in terms of functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and are not repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. In actual implementation, there may be another division manner. For example, multiple units or components may be combined or integrated. To another system, or some features can be ignored and not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices, or units, or may be electrical, mechanical, or other forms of connection.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, which may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions in the embodiments of the present application.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist separately physically, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional unit.

Through the description of the foregoing embodiments, those skilled in the art can clearly understand that the present application can be implemented by hardware, firmware, or a combination thereof. When implemented in software, the functions described above may be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. Taking this as an example but not limited to: computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or can be used to carry or store instructions or data structures Expected program code and any other medium that can be accessed by a computer. Also. Any connection is properly a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technology such as infrared, radio, and microwave, then coaxial cable , Fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fixing of the media. As used in this application, disks and discs include compact discs (CDs), laser discs, optical discs, digital versatile discs (DVDs), floppy discs and Blu-ray discs, where discs are usually magnetically copied data, and Lasers are used to duplicate the data optically. The above combination should also be included in the protection scope of the computer-readable medium.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these changes and variations.

Claims

A method for transmitting a reference signal, comprising:

Sending reference signals carried on M consecutive orthogonal frequency division multiplexed OFDM symbols;

Among the M consecutive OFDM symbols, the phase between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol. The phase difference is determined by the index of the first subcarrier, wherein the first OFDM symbol and the second OFDM symbol are any two OFDM symbols among the M consecutive OFDM symbols, and M is a value greater than or equal to 2. Integer.
The method of claim 1, further comprising:

Among the M consecutive OFDM symbols, a phase difference between a phase of a reference signal carried on a first subcarrier of a first OFDM symbol and a phase of a reference signal carried on a first subcarrier of a second OFDM symbol Is w1, and the phase difference between the phase of the reference signal carried on the second subcarrier of the first OFDM symbol and the phase of the reference signal carried on the second subcarrier of the second OFDM symbol is w2, The phase difference between the phase of the reference signal carried on the third subcarrier of the first OFDM symbol and the phase of the reference signal carried on the third subcarrier of the second OFDM symbol is w3, which is carried in all The phase difference between the phase of the reference signal on the fourth subcarrier of the first OFDM symbol and the phase of the reference signal carried on the fourth subcarrier of the second OFDM symbol is w4;

If the difference between the index of the second subcarrier and the index of the first subcarrier is equal to the difference between the index of the fourth subcarrier and the index of the third subcarrier, then the value of (w2-w1) modulo 2π is equal to (w4-w3 ) Value of modulo 2π.
The method according to claim 1 or 2, wherein:

The phase difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol is also determined by the symbol length of the OFDM symbol and / or The cyclic prefix CP length of the OFDM symbol is determined.
The method of claim 3, wherein:

The first OFDM symbol is spaced X OFDM symbols from the second OFDM symbol, the first OFDM symbol is earlier than the second OFDM symbol in the time domain, and X is an integer greater than or equal to 0; the OFDM The CP length of the symbol is determined by the CP length of the X OFDM symbols and the CP length of the second OFDM symbol.
The method according to any one of claims 1-4, wherein:

Of the M consecutive OFDM symbols, any two adjacent OFDM symbols, the phase of the reference signal carried on the first subcarrier of the subsequent OFDM symbol and the phase of the reference signal carried on the first subcarrier of the previous OFDM symbol. The phase difference between the phases of the reference signals is 2πLk / N, where N is the symbol length of the OFDM symbol, L is the CP length of the OFDM symbol, and k is the index of the first subcarrier.
The method according to any one of claims 1-4, wherein:

Among the M consecutive OFDM symbols, the phase of the reference signal carried on the first subcarrier of the uth OFDM symbol and the phase of the reference signal carried on the first subcarrier of the vth OFDM symbol Phase difference is
Where N is the symbol length of the OFDM symbol, Ln is the CP length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, k Is the index of the first subcarrier.
The method according to any one of claims 1-6, wherein the M consecutive OFDM symbols are the last M OFDM symbols of a downlink transmission part of an uplink-downlink switching period.
A method for receiving a reference signal, comprising:

Determine a first resource for receiving a reference signal, where the first resource includes an uplink OFDM symbol and / or a guard interval;

Receiving a reference signal on the first resource; the reference signal is sent through a second resource, and the second resource includes M consecutive downlink OFDM symbols; among the M consecutive downlink OFDM symbols, The phase difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol is determined by the index of the first subcarrier, where The first OFDM symbol and the second OFDM symbol are any two OFDM symbols of the M consecutive downlink OFDM symbols, and M is an integer greater than or equal to two.
The method of claim 8, further comprising:

Among the M consecutive OFDM symbols, a phase difference between a phase of a reference signal carried on a first subcarrier of a first OFDM symbol and a phase of a reference signal carried on a first subcarrier of a second OFDM symbol Is w1, and the phase difference between the phase of the reference signal carried on the second subcarrier of the first OFDM symbol and the phase of the reference signal carried on the second subcarrier of the second OFDM symbol is w2, The phase difference between the phase of the reference signal carried on the third subcarrier of the first OFDM symbol and the phase of the reference signal carried on the third subcarrier of the second OFDM symbol is w3, which is carried in all The phase difference between the phase of the reference signal on the fourth subcarrier of the first OFDM symbol and the phase of the reference signal carried on the fourth subcarrier of the second OFDM symbol is w4;

If the difference between the index of the second subcarrier and the index of the first subcarrier is equal to the difference between the index of the fourth subcarrier and the index of the third subcarrier, then the value of (w2-w1) modulo 2π is equal to (w4-w3 ) Value of modulo 2π.
The method according to claim 8 or 9, characterized in that:

The phase difference between the phase of the reference signal carried on the first subcarrier of the first OFDM symbol and the phase of the reference signal carried on the first subcarrier of the second OFDM symbol is also determined by the symbol length of the OFDM symbol and / or The cyclic prefix CP length of the OFDM symbol is determined.
The method of claim 10, wherein:

The first OFDM symbol is spaced X OFDM symbols from the second OFDM symbol, the first OFDM symbol is earlier than the second OFDM symbol in the time domain, and X is an integer greater than or equal to 0; the OFDM The CP length of the symbol is determined by the CP length of the X OFDM symbols and the CP length of the second OFDM symbol.
The method according to any one of claims 8 to 11, wherein:

Of the M consecutive OFDM symbols, any two adjacent OFDM symbols, the phase of the reference signal carried on the first subcarrier of the subsequent OFDM symbol and the phase of the reference signal carried on the first subcarrier of the previous OFDM symbol. The phase difference between the phases of the reference signals is 2πLk / N, where N is the symbol length of the OFDM symbol, L is the CP length of the OFDM symbol, and k is the index of the first subcarrier.
The method according to any one of claims 8 to 11, wherein:

Among the M consecutive OFDM symbols, the phase of the reference signal carried on the first subcarrier of the uth OFDM symbol and the phase of the reference signal carried on the first subcarrier of the vth OFDM symbol Phase difference is
Where N is the symbol length of the OFDM symbol, Ln is the CP length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, k Is the index of the first subcarrier.
The method according to any one of claims 8-13, wherein the M consecutive OFDM symbols are the last M OFDM symbols of a downlink transmission part of an uplink-downlink switching period.
A method for transmitting a reference signal, comprising:

Sending reference signals carried on M consecutive orthogonal frequency division multiplexed OFDM symbols;

Among the M consecutive OFDM symbols, any two adjacent OFDM symbols, in the time domain, the reference signal with a part of the CP removed from the latter OFDM symbol and the part of the bearer with the CP removed from the previous OFDM symbol. The signal obtained by cyclic shifting the reference signal is the same, and the length of the cyclic shift is determined by the cyclic prefix CP length of the OFDM symbol.
The method according to claim 15, wherein:

The CP length of the OFDM symbol is the CP length of the next OFDM symbol of the two adjacent OFDM symbols.
The method according to claim 15 or 16, wherein, among the M consecutive OFDM symbols, the u-th OFDM symbol removes the reference signal carried by the CP and the v-th OFDM symbol removes the reference signal carried by the CP. The signals obtained by performing cyclic shift of (uv) L length are the same, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, and L is the CP length of the OFDM symbol.
The method according to claim 15, wherein among the M consecutive OFDM symbols, the u-th OFDM symbol has a reference signal partially removed from the CP and the v-th OFDM symbol has a reference signal partially removed from the CP. get on
The signals obtained by the long cyclic shift are the same, Ln is the CP length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, and v is an integer greater than or equal to 1 and less than u.
The method according to any one of claims 15 to 18, wherein the M consecutive OFDM symbols are the last M OFDM symbols of a downlink transmission part of an uplink-downlink switching period.
A method for receiving a reference signal, comprising:

Determine a first resource for receiving a reference signal, where the first resource includes an uplink OFDM symbol and / or a guard interval;

Receiving a reference signal on the first resource; the reference signal is sent through a second resource, and the second resource includes M consecutive downlink OFDM symbols; among the M consecutive OFDM symbols, any For two adjacent OFDM symbols, in the time domain, the reference signal partially borne by CP on the latter OFDM symbol is the same as the signal obtained by cyclic shifting the reference signal partially excluding CP on the previous OFDM symbol. The length of the cyclic shift is determined by the cyclic prefix CP length of the OFDM symbol.
The method of claim 20, wherein:

The CP length of the OFDM symbol is the CP length of the next OFDM symbol of the two adjacent OFDM symbols.
The method according to claim 20 or 21, wherein among the M consecutive OFDM symbols, a reference signal carried by the u-th OFDM symbol excluding the CP and a reference signal carried by the v-th OFDM symbol excluding the CP The signals obtained by performing cyclic shift of (uv) · L length are the same, u is an integer greater than 1 and less than or equal to M, v is an integer greater than or equal to 1 and less than u, and L is the CP length of the OFDM symbol.
The method according to claim 20, wherein, among the M consecutive OFDM symbols, a reference signal carried by the u-th OFDM symbol excluding the CP and a reference signal carried by the v-th OFDM symbol excluding the CP get on
The signals obtained by the long cyclic shift are the same, Ln is the CP length of the nth OFDM symbol, u is an integer greater than 1 and less than or equal to M, and v is an integer greater than or equal to 1 and less than u.
The method according to any one of claims 20 to 23, wherein the M consecutive OFDM symbols are the last M OFDM symbols of a downlink transmission part of an uplink-downlink switching period.
A method for receiving a reference signal, comprising:

Determining a first resource for receiving a reference signal according to the obtained first information; wherein the first information includes time domain resource and / or frequency domain resource location information for carrying the reference signal;

Receiving a reference signal on the first resource.
The method of claim 25, further comprising:

Obtaining second information, where the second information includes the reference signal or parameter information required to generate the reference signal;

Determining that the reference signal is received on the first resource according to the second information, or performing channel estimation according to the second information and the received reference signal.
The method according to claim 25 or 26, wherein the first resource includes a guard time interval, or the first resource includes M downlink OFDM symbols.
A method for transmitting a reference signal, comprising:

Sending reference signals carried on Z consecutive basic resources;

The basic resource includes Y consecutive third orthogonal frequency division multiplexed OFDM symbols, and a cyclic prefix CP and / or a cyclic suffix CS; wherein one basic resource includes the Y third OFDM symbols The reference signals carried are the same; the third OFDM symbol does not include a CP;

Among the Z consecutive basic resources, a phase between a phase of a reference signal carried on a first subcarrier of a first basic resource and a phase of a reference signal carried on a first subcarrier of a second basic resource The phase difference is determined by the index of the first subcarrier, wherein the first basic resource and the second basic resource are any two basic resources among the Z consecutive basic resources, and Z and Y are greater than or equal to An integer of 2.
The method of claim 28, further comprising:

Among the Z consecutive basic resources, a phase difference between a phase of a reference signal carried on a first subcarrier of a first basic resource and a phase of a reference signal carried on a first subcarrier of a second basic resource Is w1, and the phase difference between the phase of the reference signal carried on the second subcarrier of the first basic resource and the phase of the reference signal carried on the second subcarrier of the second basic resource is w2, The phase difference between the phase of the reference signal carried on the third subcarrier of the first basic resource and the phase of the reference signal carried on the third subcarrier of the second basic resource is w3. The phase difference between the phase of the reference signal on the fourth subcarrier of the first basic resource and the phase of the reference signal carried on the fourth subcarrier of the second basic resource is w4;

If the difference between the index of the second subcarrier and the index of the first subcarrier is equal to the difference between the index of the fourth subcarrier and the index of the third subcarrier, then the value of (w2-w1) modulo 2π is equal to (w4-w3 ) Value of modulo 2π.
The method according to claim 28 or 29, wherein when the basic resource includes only Y consecutive third OFDM symbols and a CP, a reference signal carried on a first subcarrier of the first basic resource The phase difference between the phase of and the phase of the reference signal carried on the first subcarrier of the second basic resource is also determined by the symbol length of the third OFDM symbol and / or the CP length of the basic resource.
The method according to claim 30, wherein:

The first basic resource is separated from the second basic resource by X basic resources, the first basic resource is earlier than the second basic resource in the time domain, and X is an integer greater than or equal to 0; the basic The CP length of the resource is determined by the CP length of the X basic resources and the CP length of the second basic resource.
The method according to any one of claims 28 to 31, wherein when the basic resource includes only Y consecutive third OFDM symbols and a cyclic prefix CP, among the Z consecutive basic resources , The phase difference between any two adjacent basic resources, the phase of the reference signal carried on the first subcarrier of the latter basic resource and the phase of the reference signal carried on the first subcarrier of the previous basic resource Is 2πLk / N, where N is the symbol length of the third OFDM symbol, L is the CP length of the basic resource, and k is the index of the first subcarrier.
The method according to any one of claims 28 to 32, wherein when the basic resource includes only Y consecutive third OFDM symbols and a cyclic prefix CP, among the Z consecutive basic resources , The phase difference between the phase of the reference signal carried on the first subcarrier of the u-th basic resource and the phase of the reference signal carried on the first subcarrier of the v-th basic resource is
Where N is the symbol length of the third OFDM symbol, Ln is the CP length of the nth basic resource, u is an integer greater than 1 and less than or equal to Z, and v is an integer greater than or equal to 1 and less than u K is an index of the first subcarrier.
The method according to claim 28 or 29, wherein when the basic resource includes only Y consecutive third OFDM symbols and one CS, a reference carried on the first subcarrier of the first basic resource The phase difference between the phase of the signal and the phase of the reference signal carried on the first subcarrier of the second basic resource is also determined by the symbol length of the third OFDM symbol and / or the CS length of the basic resource.
The method of claim 34, wherein:

The first basic resource is separated from the second basic resource by X basic resources, the first basic resource is earlier than the second basic resource in the time domain, and X is an integer greater than or equal to 0; the basic The CS length of the resource is determined by the CS length of the X basic resources and the CS length of the first basic resource.
The method according to any one of claims 28-29, 34-35, wherein when the basic resource includes only Y consecutive third OFDM symbols and one CS, the Z consecutive basic Of resources, between any two adjacent basic resources, the phase of the reference signal carried on the first subcarrier of the latter basic resource and the phase of the reference signal carried on the first subcarrier of the previous basic resource The phase difference is 2πJk / N, where N is the symbol length of the third OFDM symbol, J is the CS length of the basic resource, and k is the index of the first subcarrier.
The method according to any one of claims 28-29, 34-35, wherein when the basic resource includes only Y consecutive third OFDM symbols and one CS, the Z consecutive basic Among resources, the phase difference between the phase of the reference signal carried on the first subcarrier of the u-th basic resource and the phase of the reference signal carried on the first subcarrier of the v-th basic resource is
Where N is the symbol length of the third OFDM symbol, Jn is the CS length of the nth basic resource, u is an integer greater than 1 and less than or equal to Z, and v is an integer greater than or equal to 1 and less than u K is an index of the first subcarrier.
The method according to claim 28 or 29, wherein when the basic resource includes Y consecutive third OFDM symbols, a CS, and a CP, the base resource is carried on the first subcarrier of the first basic resource. The phase difference between the phase of the reference signal and the phase of the reference signal carried on the first subcarrier of the second basic resource is also determined by the symbol length of the third OFDM symbol, the CS length of the basic resource, and the CP length of the basic resource.
The method according to claim 38, wherein:

The first basic resource is separated from the second basic resource by X basic resources, the first basic resource is earlier than the second basic resource in the time domain, and X is an integer greater than or equal to 0; the basic The CS length of the resource is determined by the CS length of the X basic resources and the CS length of the first basic resource, and the CP length of the basic resource is determined by the CP length of the X basic resources and the CP of the second basic resource. The length is ok.
The method according to any one of claims 28-29, 38-39, wherein when the basic resource includes Y consecutive third OFDM symbols, one CS, and one CP, the Z consecutive Among the basic resources, between any two adjacent basic resources, the phase of the reference signal carried on the first subcarrier of the latter basic resource and the phase of the reference signal carried on the first subcarrier of the previous basic resource The phase difference is 2π (L + J) k / N, where N is the symbol length of the third OFDM symbol, L is the CP length of the basic resource, J is the CS length of the basic resource, and k is the first sub The index of the carrier.
The method according to any one of claims 28-29, 38-39, wherein when the basic resource includes Y consecutive third OFDM symbols, one CS, and one CP, the Z consecutive In the basic resource, the phase difference between the phase of the reference signal carried on the first subcarrier of the uth basic resource and the phase of the reference signal carried on the first subcarrier of the vth basic resource is
Where N is the symbol length of the third OFDM symbol, Ln is the CP length of the nth basic resource, Jn is the CS length of the nth basic resource, and u is greater than 1 and less than or equal to Z. An integer, v is an integer greater than or equal to 1 and less than u, and k is an index of the first subcarrier.
The method according to any one of claims 28 to 41, wherein the Z consecutive basic resources are the last Z basic resources of a downlink transmission part of an uplink-downlink switching period.
An apparatus, which is used for performing the method according to any one of claims 1-42.
An apparatus, comprising: a processor, the processor being coupled to a memory;

Memory for storing computer programs;

A processor for executing a computer program stored in the memory, so that the apparatus executes the method according to any one of claims 1-42.
A readable storage medium, comprising a program or an instruction, and when the program or the instruction is run on a computer, the method according to any one of claims 1 to 42 is executed.